[RFC v5 02/12] drm/mediatek: Add DRM Driver for Mediatek SoC MT8173.
Daniel Kurtz
djkurtz at chromium.org
Wed Nov 4 10:49:40 PST 2015
Hi Philipp,
A bunch of review comments inline.
On Wed, Nov 4, 2015 at 7:44 PM, Philipp Zabel <p.zabel at pengutronix.de> wrote:
> From: CK Hu <ck.hu at mediatek.com>
>
> This patch adds an initial DRM driver for the Mediatek MT8173 DISP
> subsystem. It currently supports two fixed output streams from the
> OVL0/OVL1 sources to the DSI0/DPI0 sinks, respectively.
>
> Signed-off-by: CK Hu <ck.hu at mediatek.com>
> Signed-off-by: YT Shen <yt.shen at mediatek.com>
> Signed-off-by: Philipp Zabel <p.zabel at pengutronix.de>
> ---
> Changes since v4:
> - Add mtk_crtc_state to keep pending state
> - Move drm pending vblank event into mtk_crtc_state
> - Make mtk_drm_crtc private
> - Use drm_dev_alloc and drm_dev_register directly instead of
> drm_platform_init
> - Drop unnecessary locking in mtk_drm_gem_dump_map_offset
> - Remove currently unused mtk_drm_gem_mmap_buf
> - Stop referencing plane framebuffers manually
> - Set RDMA FIFO output threshold depending on frame width/height/rate
> ---
> drivers/gpu/drm/Kconfig | 2 +
> drivers/gpu/drm/Makefile | 1 +
> drivers/gpu/drm/mediatek/Kconfig | 16 +
> drivers/gpu/drm/mediatek/Makefile | 10 +
> drivers/gpu/drm/mediatek/mtk_drm_crtc.c | 590 ++++++++++++++++++++++++++++
> drivers/gpu/drm/mediatek/mtk_drm_crtc.h | 56 +++
> drivers/gpu/drm/mediatek/mtk_drm_ddp.c | 218 ++++++++++
> drivers/gpu/drm/mediatek/mtk_drm_ddp.h | 39 ++
> drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.c | 424 ++++++++++++++++++++
> drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.h | 86 ++++
> drivers/gpu/drm/mediatek/mtk_drm_drv.c | 572 +++++++++++++++++++++++++++
> drivers/gpu/drm/mediatek/mtk_drm_drv.h | 61 +++
> drivers/gpu/drm/mediatek/mtk_drm_fb.c | 151 +++++++
> drivers/gpu/drm/mediatek/mtk_drm_fb.h | 29 ++
> drivers/gpu/drm/mediatek/mtk_drm_gem.c | 189 +++++++++
> drivers/gpu/drm/mediatek/mtk_drm_gem.h | 56 +++
> drivers/gpu/drm/mediatek/mtk_drm_plane.c | 167 ++++++++
> drivers/gpu/drm/mediatek/mtk_drm_plane.h | 41 ++
> 18 files changed, 2708 insertions(+)
> create mode 100644 drivers/gpu/drm/mediatek/Kconfig
> create mode 100644 drivers/gpu/drm/mediatek/Makefile
> create mode 100644 drivers/gpu/drm/mediatek/mtk_drm_crtc.c
> create mode 100644 drivers/gpu/drm/mediatek/mtk_drm_crtc.h
> create mode 100644 drivers/gpu/drm/mediatek/mtk_drm_ddp.c
> create mode 100644 drivers/gpu/drm/mediatek/mtk_drm_ddp.h
> create mode 100644 drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.c
> create mode 100644 drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.h
> create mode 100644 drivers/gpu/drm/mediatek/mtk_drm_drv.c
> create mode 100644 drivers/gpu/drm/mediatek/mtk_drm_drv.h
> create mode 100644 drivers/gpu/drm/mediatek/mtk_drm_fb.c
> create mode 100644 drivers/gpu/drm/mediatek/mtk_drm_fb.h
> create mode 100644 drivers/gpu/drm/mediatek/mtk_drm_gem.c
> create mode 100644 drivers/gpu/drm/mediatek/mtk_drm_gem.h
> create mode 100644 drivers/gpu/drm/mediatek/mtk_drm_plane.c
> create mode 100644 drivers/gpu/drm/mediatek/mtk_drm_plane.h
>
> diff --git a/drivers/gpu/drm/Kconfig b/drivers/gpu/drm/Kconfig
> index 1a0a8df..9e9987b 100644
> --- a/drivers/gpu/drm/Kconfig
> +++ b/drivers/gpu/drm/Kconfig
> @@ -264,3 +264,5 @@ source "drivers/gpu/drm/sti/Kconfig"
> source "drivers/gpu/drm/amd/amdkfd/Kconfig"
>
> source "drivers/gpu/drm/imx/Kconfig"
> +
> +source "drivers/gpu/drm/mediatek/Kconfig"
> diff --git a/drivers/gpu/drm/Makefile b/drivers/gpu/drm/Makefile
> index 45e7719..af6b592 100644
> --- a/drivers/gpu/drm/Makefile
> +++ b/drivers/gpu/drm/Makefile
> @@ -67,6 +67,7 @@ obj-$(CONFIG_DRM_MSM) += msm/
> obj-$(CONFIG_DRM_TEGRA) += tegra/
> obj-$(CONFIG_DRM_STI) += sti/
> obj-$(CONFIG_DRM_IMX) += imx/
> +obj-$(CONFIG_DRM_MEDIATEK) += mediatek/
> obj-y += i2c/
> obj-y += panel/
> obj-y += bridge/
> diff --git a/drivers/gpu/drm/mediatek/Kconfig b/drivers/gpu/drm/mediatek/Kconfig
> new file mode 100644
> index 0000000..5343cf1
> --- /dev/null
> +++ b/drivers/gpu/drm/mediatek/Kconfig
> @@ -0,0 +1,16 @@
> +config DRM_MEDIATEK
> + tristate "DRM Support for Mediatek SoCs"
> + depends on DRM
> + depends on ARCH_MEDIATEK || (ARM && COMPILE_TEST)
> + select MTK_SMI
> + select DRM_PANEL
> + select DRM_MIPI_DSI
> + select DRM_PANEL_SIMPLE
> + select DRM_KMS_HELPER
> + select IOMMU_DMA
> + help
> + Choose this option if you have a Mediatek SoCs.
> + The module will be called mediatek-drm
> + This driver provides kernel mode setting and
> + buffer management to userspace.
> +
> diff --git a/drivers/gpu/drm/mediatek/Makefile b/drivers/gpu/drm/mediatek/Makefile
> new file mode 100644
> index 0000000..ba6d3fc
> --- /dev/null
> +++ b/drivers/gpu/drm/mediatek/Makefile
> @@ -0,0 +1,10 @@
> +mediatek-drm-y := mtk_drm_drv.o \
> + mtk_drm_crtc.o \
> + mtk_drm_ddp.o \
> + mtk_drm_ddp_comp.o \
> + mtk_drm_fb.o \
> + mtk_drm_gem.o \
> + mtk_drm_plane.o
> +
> +obj-$(CONFIG_DRM_MEDIATEK) += mediatek-drm.o
> +
> diff --git a/drivers/gpu/drm/mediatek/mtk_drm_crtc.c b/drivers/gpu/drm/mediatek/mtk_drm_crtc.c
> new file mode 100644
> index 0000000..4493714
> --- /dev/null
> +++ b/drivers/gpu/drm/mediatek/mtk_drm_crtc.c
> @@ -0,0 +1,590 @@
> +/*
> + * Copyright (c) 2015 MediaTek Inc.
> + *
> + * This program is free software; you can redistribute it and/or modify
> + * it under the terms of the GNU General Public License version 2 as
> + * published by the Free Software Foundation.
> + *
> + * This program is distributed in the hope that it will be useful,
> + * but WITHOUT ANY WARRANTY; without even the implied warranty of
> + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
> + * GNU General Public License for more details.
> + */
> +
> +#include <drm/drmP.h>
> +#include <drm/drm_atomic_helper.h>
> +#include <drm/drm_crtc_helper.h>
> +#include <drm/drm_plane_helper.h>
> +#include <linux/clk.h>
> +#include <linux/component.h>
> +#include <linux/dma-buf.h>
> +#include <linux/of_device.h>
> +#include <linux/of_irq.h>
> +#include <linux/platform_device.h>
> +#include <linux/pm_runtime.h>
> +#include <linux/reservation.h>
> +
> +#include "mtk_drm_drv.h"
> +#include "mtk_drm_crtc.h"
> +#include "mtk_drm_ddp.h"
> +#include "mtk_drm_ddp_comp.h"
> +#include "mtk_drm_gem.h"
> +#include "mtk_drm_plane.h"
> +
> +struct mtk_crtc_ddp_context;
> +
> +/*
> + * MediaTek specific crtc structure.
> + *
> + * @base: crtc object.
> + * @pipe: a crtc index created at load() with a new crtc object creation
> + * and the crtc object would be set to private->crtc array
> + * to get a crtc object corresponding to this pipe from private->crtc
> + * array when irq interrupt occurred. the reason of using this pipe is that
> + * drm framework doesn't support multiple irq yet.
> + * we can refer to the crtc to current hardware interrupt occurred through
> + * this pipe value.
> + * @enabled: crtc enabled
> + * @ctx: mtk crtc context object
> + */
> +struct mtk_drm_crtc {
> + struct drm_crtc base;
> + unsigned int pipe;
There is one pipe too many :-)
I think this one is not used."
> + bool enabled;
> + struct mtk_crtc_ddp_context *ctx;
I think you should be able to just embed the "mtk_crtc_ddp_context"
right into mtk_drm_crtc.
Or maybe just get rid of mtk_crtc_ddp_context completely and just use
mtk_drm_crtc eveywhere.
> +
> + bool do_flush;
> +};
> +
> +struct mtk_crtc_ddp_context {
> + struct device *dev;
> + struct drm_device *drm_dev;
> + struct mtk_drm_crtc *crtc;
> + struct mtk_drm_plane planes[OVL_LAYER_NR];
> + int pipe;
> +
> + void __iomem *config_regs;
> + struct device *mutex_dev;
> + u32 ddp_comp_nr;
> + struct mtk_ddp_comp *ddp_comp;
> +};
> +
> +static inline struct mtk_drm_crtc *to_mtk_crtc(struct drm_crtc *c)
> +{
> + return container_of(c, struct mtk_drm_crtc, base);
> +}
> +
> +void mtk_drm_crtc_finish_page_flip(struct mtk_drm_crtc *mtk_crtc)
> +{
> + struct drm_crtc *crtc = &mtk_crtc->base;
> + struct mtk_crtc_state *state = to_mtk_crtc_state(crtc->state);
> + struct drm_device *dev = mtk_crtc->base.dev;
> +
> + drm_send_vblank_event(dev, state->event->pipe, state->event);
> + drm_crtc_vblank_put(crtc);
> + state->event = NULL;
> +}
> +
> +static void mtk_drm_crtc_destroy(struct drm_crtc *crtc)
> +{
> + drm_crtc_cleanup(crtc);
> +}
> +
> +struct drm_crtc_state *mtk_drm_crtc_duplicate_state(struct drm_crtc *crtc)
> +{
> + struct mtk_crtc_state *crtc_state;
> +
> + crtc_state = kzalloc(sizeof(*crtc_state), GFP_KERNEL);
> + if (!crtc_state)
> + return NULL;
> +
> + __drm_atomic_helper_crtc_duplicate_state(crtc, &crtc_state->base);
> +
> + crtc_state->base.crtc = crtc;
> +
> + return &crtc_state->base;
> +}
> +
> +static bool mtk_drm_crtc_mode_fixup(struct drm_crtc *crtc,
> + const struct drm_display_mode *mode,
> + struct drm_display_mode *adjusted_mode)
> +{
> + /* drm framework doesn't check NULL */
> + return true;
> +}
> +
> +static void mtk_drm_crtc_mode_set_nofb(struct drm_crtc *crtc)
> +{
> + struct mtk_crtc_state *state = to_mtk_crtc_state(crtc->state);
> +
> + state->pending_width = crtc->mode.hdisplay;
> + state->pending_height = crtc->mode.vdisplay;
> + state->pending_vrefresh = crtc->mode.vrefresh;
> + state->pending_config = true;
> +}
> +
> +int mtk_drm_crtc_enable_vblank(struct drm_device *drm, int pipe)
> +{
> + struct mtk_drm_private *priv = drm->dev_private;
> + struct mtk_drm_crtc *mtk_crtc = to_mtk_crtc(priv->crtc[pipe]);
> + struct mtk_crtc_ddp_context *ctx = mtk_crtc->ctx;
> + struct mtk_ddp_comp *ovl = &ctx->ddp_comp[0];
> +
> + if (ovl->funcs->comp_enable_vblank)
> + ovl->funcs->comp_enable_vblank(ovl->regs);
> +
> + return 0;
> +}
> +
> +void mtk_drm_crtc_disable_vblank(struct drm_device *drm, int pipe)
> +{
> + struct mtk_drm_private *priv = drm->dev_private;
> + struct mtk_drm_crtc *mtk_crtc = to_mtk_crtc(priv->crtc[pipe]);
> + struct mtk_crtc_ddp_context *ctx = mtk_crtc->ctx;
> + struct mtk_ddp_comp *ovl = &ctx->ddp_comp[0];
> +
> + if (ovl->funcs->comp_disable_vblank)
> + ovl->funcs->comp_disable_vblank(ovl->regs);
> +}
> +
> +static void mtk_crtc_ddp_power_on(struct mtk_crtc_ddp_context *ctx)
> +{
> + int ret;
> + int i;
> +
> + DRM_INFO("mtk_crtc_ddp_power_on\n");
> + for (i = 0; i < ctx->ddp_comp_nr; i++) {
> + ret = clk_enable(ctx->ddp_comp[i].clk);
> + if (ret)
> + DRM_ERROR("clk_enable(ctx->ddp_comp_clk[%d])\n", i);
> + }
> +}
> +
> +static void mtk_crtc_ddp_power_off(struct mtk_crtc_ddp_context *ctx)
> +{
> + int i;
> +
> + DRM_INFO("mtk_crtc_ddp_power_off\n");
> + for (i = 0; i < ctx->ddp_comp_nr; i++)
> + clk_disable(ctx->ddp_comp[i].clk);
> +}
> +
> +static void mtk_crtc_ddp_hw_init(struct mtk_drm_crtc *crtc)
> +{
> + struct mtk_crtc_ddp_context *ctx = crtc->ctx;
> + struct drm_device *drm = crtc->base.dev;
> + unsigned int width, height, vrefresh;
> + int ret;
> + int i;
> +
> + if (ctx->crtc->base.state) {
> + width = crtc->base.state->adjusted_mode.hdisplay;
> + height = crtc->base.state->adjusted_mode.vdisplay;
> + vrefresh = crtc->base.state->adjusted_mode.vrefresh;
> + } else {
> + width = 1920;
> + height = 1080;
> + vrefresh = 60;
> + }
> +
> + DRM_INFO("mtk_crtc_ddp_hw_init\n");
> +
> + /* disp_mtcmos */
> + ret = pm_runtime_get_sync(drm->dev);
> + if (ret < 0)
> + DRM_ERROR("Failed to enable power domain: %d\n", ret);
> +
> + mtk_ddp_clock_on(ctx->mutex_dev);
> + mtk_crtc_ddp_power_on(ctx);
get_sync(), clock_on() and ddp_power_on() really can fail; we are just
ignoring errors here.
Since they can fail, shouldn't they be moved out of the atomic
"->enable()" path into the ->check() path that is allowed to fail?
> +
> + DRM_INFO("mediatek_ddp_ddp_path_setup\n");
> + for (i = 0; i < (ctx->ddp_comp_nr - 1); i++) {
nit: the inner () are not necessary.
> + mtk_ddp_add_comp_to_path(ctx->config_regs, ctx->pipe,
> + ctx->ddp_comp[i].funcs->comp_id,
> + ctx->ddp_comp[i+1].funcs->comp_id);
> + mtk_ddp_add_comp_to_mutex(ctx->mutex_dev, ctx->pipe,
> + ctx->ddp_comp[i].funcs->comp_id,
> + ctx->ddp_comp[i+1].funcs->comp_id);
> + }
Do you really have to do this here in the enable path? This looks
like something that should be done in bind()?
Perhaps all we really need here is to walk the path and write to
DISP_REG_MUTEX_EN at the end of mtk_ddp_add_comp_to_mutex().
By the way, where are those bits cleared in the disable path?
> +
> + DRM_INFO("ddp_disp_path_power_on %dx%d\n", width, height);
> + for (i = 0; i < ctx->ddp_comp_nr; i++) {
> + struct mtk_ddp_comp *comp = &ctx->ddp_comp[i];
> +
> + if (comp->funcs->comp_config)
> + comp->funcs->comp_config(comp->regs, width, height,
> + vrefresh);
> +
> + if (comp->funcs->comp_power_on)
> + comp->funcs->comp_power_on(comp->regs);
> + }
> +}
> +
> +static void mtk_crtc_ddp_hw_fini(struct mtk_drm_crtc *crtc)
> +{
> + struct mtk_crtc_ddp_context *ctx = crtc->ctx;
> + struct drm_device *drm = crtc->base.dev;
> + struct mtk_ddp_comp *ovl = &ctx->ddp_comp[0];
> + struct mtk_crtc_state *state = to_mtk_crtc_state(crtc->base.state);
> + int i;
> +
> + DRM_INFO("mtk_crtc_ddp_hw_fini\n");
> + for (i = 0; i < OVL_LAYER_NR; i++) {
> + state->pending_ovl_enable[i] = false;
> + ovl->funcs->comp_layer_off(ovl->regs, i);
> + }
> + mtk_crtc_ddp_power_off(ctx);
> + mtk_ddp_clock_off(ctx->mutex_dev);
> +
> + /* disp_mtcmos */
> + pm_runtime_put_sync(drm->dev);
Why sync?
> +}
> +
> +static void mtk_drm_crtc_enable(struct drm_crtc *crtc)
> +{
> + struct mtk_drm_crtc *mtk_crtc = to_mtk_crtc(crtc);
> +
> + if (WARN_ON(mtk_crtc->enabled))
> + return;
> +
> + mtk_crtc_ddp_hw_init(mtk_crtc);
> +
> + drm_crtc_vblank_on(crtc);
> + WARN_ON(drm_crtc_vblank_get(crtc) != 0);
> +
> + mtk_crtc->enabled = true;
> +}
> +
> +static void mtk_drm_crtc_disable(struct drm_crtc *crtc)
> +{
> + struct mtk_drm_crtc *mtk_crtc = to_mtk_crtc(crtc);
> + struct mtk_crtc_state *state = to_mtk_crtc_state(crtc->state);
> +
> + DRM_INFO("mtk_drm_crtc_disable %d\n", crtc->base.id);
> + if (WARN_ON(!mtk_crtc->enabled))
> + return;
> +
> + mtk_crtc_ddp_hw_fini(mtk_crtc);
> + mtk_crtc->do_flush = false;
> + if (state->event)
> + mtk_drm_crtc_finish_page_flip(mtk_crtc);
It is a bit awkward to send the page flip event before the actual page
flip has completed (in this case, for a page flip that you are
canceling by disabling the crtc).
Would it be better to wait for vblank here in crtc_disable instead?
> + drm_crtc_vblank_put(crtc);
> + drm_crtc_vblank_off(crtc);
> +
> + mtk_crtc->enabled = false;
> +}
> +
> +static void mtk_drm_crtc_atomic_begin(struct drm_crtc *crtc,
> + struct drm_crtc_state *old_crtc_state)
> +{
> + struct mtk_crtc_state *state = to_mtk_crtc_state(crtc->state);
> +
> + if (state->base.event) {
> + state->base.event->pipe = drm_crtc_index(crtc);
> + WARN_ON(drm_crtc_vblank_get(crtc) != 0);
> + state->event = state->base.event;
> + state->base.event = NULL;
Hmm. Why are we "stealing" event from drm_crtc_state and handing it
over to the wrapper mtk_crtc_state?
Won't we still be able to retrieve state->base.event later when we
need it in the mtk_drm_crtc_finish_page_flip?
> + }
> +}
> +
> +void mtk_drm_crtc_commit(struct drm_crtc *crtc)
> +{
> + struct mtk_crtc_state *state = to_mtk_crtc_state(crtc->state);
> + unsigned int i;
> +
> + for (i = 0; i < OVL_LAYER_NR; i++)
> + if (state->pending_ovl_dirty[i]) {
> + state->pending_ovl_config[i] = true;
> + state->pending_ovl_dirty[i] = false;
> + }
> +}
> +
> +static void mtk_drm_crtc_atomic_flush(struct drm_crtc *crtc,
> + struct drm_crtc_state *old_crtc_state)
> +{
> + mtk_drm_crtc_commit(crtc);
> +}
> +
> +static const struct drm_crtc_funcs mtk_crtc_funcs = {
> + .set_config = drm_atomic_helper_set_config,
> + .page_flip = drm_atomic_helper_page_flip,
> + .destroy = mtk_drm_crtc_destroy,
> + .reset = drm_atomic_helper_crtc_reset,
> + .atomic_duplicate_state = mtk_drm_crtc_duplicate_state,
> + .atomic_destroy_state = drm_atomic_helper_crtc_destroy_state,
> +};
> +
> +static const struct drm_crtc_helper_funcs mtk_crtc_helper_funcs = {
> + .mode_fixup = mtk_drm_crtc_mode_fixup,
> + .mode_set_nofb = mtk_drm_crtc_mode_set_nofb,
> + .enable = mtk_drm_crtc_enable,
> + .disable = mtk_drm_crtc_disable,
> + .atomic_begin = mtk_drm_crtc_atomic_begin,
> + .atomic_flush = mtk_drm_crtc_atomic_flush,
> +};
> +
> +struct mtk_drm_crtc *mtk_drm_crtc_create(struct drm_device *drm,
> + struct drm_plane *primary, struct drm_plane *cursor, int pipe,
> + void *ctx)
> +{
> + struct mtk_drm_private *priv = drm->dev_private;
> + struct mtk_drm_crtc *mtk_crtc;
> + int ret;
> +
> + mtk_crtc = devm_kzalloc(drm->dev, sizeof(*mtk_crtc), GFP_KERNEL);
> + if (!mtk_crtc)
> + return ERR_PTR(-ENOMEM);
> +
> + mtk_crtc->pipe = pipe;
> + mtk_crtc->ctx = ctx;
> + mtk_crtc->enabled = false;
> +
> + priv->crtc[pipe] = &mtk_crtc->base;
> +
> + ret = drm_crtc_init_with_planes(drm, &mtk_crtc->base, primary, cursor,
> + &mtk_crtc_funcs);
> + if (ret)
> + goto err_cleanup_crtc;
> +
> + drm_crtc_helper_add(&mtk_crtc->base, &mtk_crtc_helper_funcs);
> +
> + return mtk_crtc;
> +
> +err_cleanup_crtc:
> + drm_crtc_cleanup(&mtk_crtc->base);
> + return ERR_PTR(ret);
> +}
> +
> +void mtk_drm_crtc_plane_config(struct drm_crtc *crtc, unsigned int idx,
> + bool enable, dma_addr_t addr)
> +{
> + struct mtk_drm_crtc *mtk_crtc = to_mtk_crtc(crtc);
> + struct mtk_crtc_ddp_context *ctx = mtk_crtc->ctx;
> + struct drm_plane *plane = &ctx->planes[idx].base;
> + struct mtk_crtc_state *state = to_mtk_crtc_state(crtc->state);
> + unsigned int pitch, format;
> + int x, y;
> +
> + if (!plane->fb || !plane->state)
> + return;
> +
> + pitch = plane->fb->pitches[0];
> + format = plane->fb->pixel_format;
> +
> + x = plane->state->crtc_x;
> + y = plane->state->crtc_y;
> +
> + if (x < 0) {
> + addr -= x * 4;
> + x = 0;
> + }
> +
> + if (y < 0) {
> + addr -= y * pitch;
> + y = 0;
> + }
> +
> + state->pending_ovl_enable[idx] = enable;
> + state->pending_ovl_addr[idx] = addr;
> + state->pending_ovl_pitch[idx] = pitch;
> + state->pending_ovl_format[idx] = format;
> + state->pending_ovl_x[idx] = x;
> + state->pending_ovl_y[idx] = y;
> + state->pending_ovl_size[idx] = ctx->planes[idx].disp_size;
> + state->pending_ovl_dirty[idx] = true;
> +}
> +
> +static void mtk_crtc_ddp_irq(struct mtk_crtc_ddp_context *ctx)
==> So, this is the part of the driver that makes me the most nervous.
Why are we writing the actual hardware registers in the *vblank
interrupt handler*?!
Every other display controller that I've ever seen has shadow
registers that are used to stage a page flip at the next vblank.
Are you sure this hardware doesn't support this?
In any case, how do we get that first interrupt in which to apply the register?
> +{
> + struct mtk_drm_crtc *mtk_crtc = ctx->crtc;
> + struct mtk_ddp_comp *ovl = &ctx->ddp_comp[0];
ddp_comp[0] here looks a bit like black magic. "The 0th component is
always the ovl".
Perhaps make an explicitly named "ovl" field for mtk_crtc_ddp_context.
> + struct mtk_crtc_state *state = to_mtk_crtc_state(mtk_crtc->base.state);
> + unsigned int i;
> +
> + if (state->pending_config) {
> + state->pending_config = false;
> +
> + for (i = 0; i < OVL_LAYER_NR; i++)
> + ovl->funcs->comp_layer_off(ovl->regs, i);
Why do you need to turn off all layers before setting mode?
> + ovl->funcs->comp_config(ovl->regs, state->pending_width,
> + state->pending_height,
> + state->pending_vrefresh);
> + }
> +
> + for (i = 0; i < OVL_LAYER_NR; i++) {
> + if (state->pending_ovl_config[i]) {
> + if (!state->pending_ovl_enable[i])
> + ovl->funcs->comp_layer_off(ovl->regs, i);
> +
> + ovl->funcs->comp_layer_config(ovl->regs, i,
> + state->pending_ovl_addr[i],
> + state->pending_ovl_pitch[i],
> + state->pending_ovl_format[i],
> + state->pending_ovl_x[i],
> + state->pending_ovl_y[i],
> + state->pending_ovl_size[i]);
> +
> + if (state->pending_ovl_enable[i])
> + ovl->funcs->comp_layer_on(ovl->regs, i);
> + }
I'd move this all all with an mtk_plane function, and let each
mtk_plane store its own pending state.
> +
> + state->pending_ovl_config[i] = false;
> + }
> +
> + drm_handle_vblank(ctx->drm_dev, ctx->pipe);
> +}
> +
> +static irqreturn_t mtk_crtc_ddp_irq_handler(int irq, void *dev_id)
> +{
> + struct mtk_crtc_ddp_context *ctx = dev_id;
> + struct mtk_ddp_comp *ovl = &ctx->ddp_comp[0];
> +
> + if (ovl->funcs->comp_clear_vblank)
> + ovl->funcs->comp_clear_vblank(ovl->regs);
> +
> + if (ctx->pipe >= 0 && ctx->drm_dev)
> + mtk_crtc_ddp_irq(ctx);
> +
> + return IRQ_HANDLED;
> +}
> +
> +static int mtk_crtc_ddp_bind(struct device *dev, struct device *master,
> + void *data)
> +{
> + struct mtk_crtc_ddp_context *ctx = dev_get_drvdata(dev);
> + struct drm_device *drm_dev = data;
> + struct mtk_drm_private *priv = drm_dev->dev_private;
> + struct device_node *node;
> + enum drm_plane_type type;
> + unsigned int zpos;
> + int ret;
> + int i;
> +
> + ctx->drm_dev = drm_dev;
> + ctx->pipe = priv->pipe++;
> + ctx->config_regs = priv->config_regs;
> + ctx->mutex_dev = priv->mutex_dev;
> + ctx->ddp_comp_nr = priv->path_len[ctx->pipe];
> + ctx->ddp_comp = devm_kmalloc_array(dev, ctx->ddp_comp_nr,
> + sizeof(*ctx->ddp_comp), GFP_KERNEL);
> +
> + /* priv->path[ctx->pipe] starts with this OVL node */
> + priv->comp_node[priv->path[ctx->pipe][0]] = dev->of_node;
> +
> + for (i = 0; i < ctx->ddp_comp_nr; i++) {
> + struct mtk_ddp_comp *comp = &ctx->ddp_comp[i];
> + enum mtk_ddp_comp_id comp_id = priv->path[ctx->pipe][i];
> +
> + ret = mtk_ddp_comp_init(priv->comp_node[comp_id], comp,
> + comp_id);
> + if (ret) {
> + dev_err(dev, "Failed to initialize component %i\n", i);
> + goto unprepare;
> + }
> +
> + if (comp->clk) {
> + ret = clk_prepare(comp->clk);
> + if (ret) {
> + dev_err(dev, "Failed to prepare clock %d\n", i);
> + ret = -EINVAL;
> + goto unprepare;
> + }
> + }
> + }
> +
> + for (zpos = 0; zpos < OVL_LAYER_NR; zpos++) {
> + type = (zpos == 0) ? DRM_PLANE_TYPE_PRIMARY :
> + (zpos == 1) ? DRM_PLANE_TYPE_CURSOR :
> + DRM_PLANE_TYPE_OVERLAY;
> + ret = mtk_plane_init(drm_dev, &ctx->planes[zpos],
> + 1 << ctx->pipe, type, zpos, OVL_LAYER_NR);
> + if (ret)
> + goto unprepare;
> + }
I think you should just let mtk_drm_crtc_create() create & init its own planes.
Currently, its overlay planes are unassigned.
Furthermore, the crtc context doesn't really need an array of planes at all.
It only really uses the array to know which planes to update during
the vblank irq.
But, that information is actually already present in the atomic state
to be applied itself.
> +
> + ctx->crtc = mtk_drm_crtc_create(drm_dev, &ctx->planes[0].base,
> + &ctx->planes[1].base, ctx->pipe, ctx);
> +
> + if (IS_ERR(ctx->crtc)) {
> + ret = PTR_ERR(ctx->crtc);
> + goto unprepare;
> + }
> +
> + return 0;
> +
> +unprepare:
> + while (--i >= 0)
> + clk_unprepare(ctx->ddp_comp[i].clk);
> + of_node_put(node);
> +
> + return ret;
> +}
> +
> +static void mtk_crtc_ddp_unbind(struct device *dev, struct device *master,
> + void *data)
> +{
> + struct mtk_crtc_ddp_context *ctx = dev_get_drvdata(dev);
> + int i;
> +
> + for (i = 0; i < ctx->ddp_comp_nr; i++)
> + clk_unprepare(ctx->ddp_comp[i].clk);
> +}
> +
> +static const struct component_ops mtk_crtc_ddp_component_ops = {
> + .bind = mtk_crtc_ddp_bind,
> + .unbind = mtk_crtc_ddp_unbind,
> +};
> +
> +static int mtk_crtc_ddp_probe(struct platform_device *pdev)
> +{
> + struct device *dev = &pdev->dev;
> + struct mtk_crtc_ddp_context *ctx;
> + int irq;
> + int ret;
> +
> + ctx = devm_kzalloc(dev, sizeof(*ctx), GFP_KERNEL);
> + if (!ctx)
> + return -ENOMEM;
> +
> + irq = platform_get_irq(pdev, 0);
> + if (irq < 0)
> + return irq;
> +
> + ret = devm_request_irq(dev, irq, mtk_crtc_ddp_irq_handler,
> + IRQF_TRIGGER_NONE, dev_name(dev), ctx);
> + if (ret < 0) {
> + dev_err(dev, "Failed to request irq %d: %d\n", irq, ret);
> + return -ENXIO;
> + }
> +
> + platform_set_drvdata(pdev, ctx);
> +
> + ret = component_add(dev, &mtk_crtc_ddp_component_ops);
> + if (ret)
> + dev_err(dev, "Failed to add component: %d\n", ret);
> +
> + return ret;
> +}
> +
> +static int mtk_crtc_ddp_remove(struct platform_device *pdev)
> +{
> + component_del(&pdev->dev, &mtk_crtc_ddp_component_ops);
> +
> + return 0;
> +}
> +
> +static const struct of_device_id mtk_disp_ovl_driver_dt_match[] = {
> + { .compatible = "mediatek,mt8173-disp-ovl", },
> + {},
> +};
> +MODULE_DEVICE_TABLE(of, mtk_disp_ovl_driver_dt_match);
> +
> +struct platform_driver mtk_disp_ovl_driver = {
> + .probe = mtk_crtc_ddp_probe,
> + .remove = mtk_crtc_ddp_remove,
> + .driver = {
> + .name = "mediatek-disp-ovl",
> + .owner = THIS_MODULE,
> + .of_match_table = mtk_disp_ovl_driver_dt_match,
> + },
> +};
> diff --git a/drivers/gpu/drm/mediatek/mtk_drm_crtc.h b/drivers/gpu/drm/mediatek/mtk_drm_crtc.h
> new file mode 100644
> index 0000000..b696066
> --- /dev/null
> +++ b/drivers/gpu/drm/mediatek/mtk_drm_crtc.h
> @@ -0,0 +1,56 @@
> +/*
> + * Copyright (c) 2015 MediaTek Inc.
> + *
> + * This program is free software; you can redistribute it and/or modify
> + * it under the terms of the GNU General Public License version 2 as
> + * published by the Free Software Foundation.
> + *
> + * This program is distributed in the hope that it will be useful,
> + * but WITHOUT ANY WARRANTY; without even the implied warranty of
> + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
> + * GNU General Public License for more details.
> + */
> +
> +#ifndef MTK_DRM_CRTC_H
> +#define MTK_DRM_CRTC_H
> +
> +#include <drm/drm_crtc.h>
> +#include "mtk_drm_plane.h"
> +
> +#define OVL_LAYER_NR 4
> +
> +struct mtk_crtc_state {
> + struct drm_crtc_state base;
> + struct drm_pending_vblank_event *event;
> +
> + unsigned int pending_update;
> + bool pending_needs_vblank;
> +
> + bool pending_config;
> + unsigned int pending_width;
> + unsigned int pending_height;
> + unsigned int pending_vrefresh;
> +
> + bool pending_ovl_config[OVL_LAYER_NR];
> + bool pending_ovl_enable[OVL_LAYER_NR];
> + unsigned int pending_ovl_addr[OVL_LAYER_NR];
> + unsigned int pending_ovl_pitch[OVL_LAYER_NR];
> + unsigned int pending_ovl_format[OVL_LAYER_NR];
> + int pending_ovl_x[OVL_LAYER_NR];
> + int pending_ovl_y[OVL_LAYER_NR];
> + unsigned int pending_ovl_size[OVL_LAYER_NR];
> + bool pending_ovl_dirty[OVL_LAYER_NR];
All of these OVL_LAYER_NR length arrays look like mtk_plane_state to me.
I think we want to do something similar and wrap drm_plane_state.
> +};
> +
> +static inline struct mtk_crtc_state *to_mtk_crtc_state(struct drm_crtc_state *s)
> +{
> + return container_of(s, struct mtk_crtc_state, base);
> +}
> +
> +int mtk_drm_crtc_enable_vblank(struct drm_device *drm, int pipe);
> +void mtk_drm_crtc_disable_vblank(struct drm_device *drm, int pipe);
> +void mtk_drm_crtc_plane_config(struct drm_crtc *crtc, unsigned int idx,
> + bool enable, dma_addr_t addr);
> +void mtk_drm_crtc_commit(struct drm_crtc *crtc);
> +
> +#endif /* MTK_DRM_CRTC_H */
> diff --git a/drivers/gpu/drm/mediatek/mtk_drm_ddp.c b/drivers/gpu/drm/mediatek/mtk_drm_ddp.c
> new file mode 100644
> index 0000000..9ec2960
> --- /dev/null
> +++ b/drivers/gpu/drm/mediatek/mtk_drm_ddp.c
> @@ -0,0 +1,218 @@
> +/*
> + * Copyright (c) 2015 MediaTek Inc.
> + *
> + * This program is free software; you can redistribute it and/or modify
> + * it under the terms of the GNU General Public License version 2 as
> + * published by the Free Software Foundation.
> + *
> + * This program is distributed in the hope that it will be useful,
> + * but WITHOUT ANY WARRANTY; without even the implied warranty of
> + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
> + * GNU General Public License for more details.
> + */
> +
> +#include <drm/drmP.h>
> +#include <linux/clk.h>
> +#include <linux/component.h>
> +#include <linux/of_device.h>
> +#include <linux/platform_device.h>
> +#include <linux/regmap.h>
> +
> +#include "mtk_drm_crtc.h"
> +#include "mtk_drm_ddp.h"
> +#include "mtk_drm_ddp_comp.h"
> +
> +#define DISP_REG_CONFIG_DISP_OVL0_MOUT_EN 0x040
> +#define DISP_REG_CONFIG_DISP_OVL1_MOUT_EN 0x044
> +#define DISP_REG_CONFIG_DISP_OD_MOUT_EN 0x048
> +#define DISP_REG_CONFIG_DISP_GAMMA_MOUT_EN 0x04c
> +#define DISP_REG_CONFIG_DISP_UFOE_MOUT_EN 0x050
> +#define DISP_REG_CONFIG_DISP_COLOR0_SEL_IN 0x084
> +#define DISP_REG_CONFIG_DISP_COLOR1_SEL_IN 0x088
> +#define DISP_REG_CONFIG_DPI_SEL_IN 0x0ac
> +#define DISP_REG_CONFIG_DISP_RDMA1_MOUT_EN 0x0c8
> +#define DISP_REG_CONFIG_MMSYS_CG_CON0 0x100
> +
> +#define DISP_REG_MUTEX_EN(n) (0x20 + 0x20 * n)
> +#define DISP_REG_MUTEX_RST(n) (0x28 + 0x20 * n)
> +#define DISP_REG_MUTEX_MOD(n) (0x2c + 0x20 * n)
> +#define DISP_REG_MUTEX_SOF(n) (0x30 + 0x20 * n)
The n should be in parens here.
> +
> +#define MUTEX_MOD_OVL0 11
> +#define MUTEX_MOD_OVL1 12
> +#define MUTEX_MOD_RDMA0 13
> +#define MUTEX_MOD_RDMA1 14
> +#define MUTEX_MOD_COLOR0 18
> +#define MUTEX_MOD_COLOR1 19
> +#define MUTEX_MOD_AAL 20
> +#define MUTEX_MOD_GAMMA 21
> +#define MUTEX_MOD_UFOE 22
> +#define MUTEX_MOD_PWM0 23
> +#define MUTEX_MOD_OD 25
> +
> +#define MUTEX_SOF_DSI0 1
> +#define MUTEX_SOF_DPI0 3
> +
> +#define OVL0_MOUT_EN_COLOR0 0x1
> +#define OD_MOUT_EN_RDMA0 0x1
> +#define UFOE_MOUT_EN_DSI0 0x1
> +#define COLOR0_SEL_IN_OVL0 0x1
> +#define OVL1_MOUT_EN_COLOR1 0x1
> +#define GAMMA_MOUT_EN_RDMA1 0x1
> +#define RDMA1_MOUT_DPI0 0x2
> +#define DPI0_SEL_IN_RDMA1 0x1
> +#define COLOR1_SEL_IN_OVL1 0x1
> +
> +static const unsigned int mutex_mod[DDP_COMPONENT_ID_MAX] = {
> + [DDP_COMPONENT_AAL] = MUTEX_MOD_AAL,
> + [DDP_COMPONENT_COLOR0] = MUTEX_MOD_COLOR0,
> + [DDP_COMPONENT_COLOR1] = MUTEX_MOD_COLOR1,
> + [DDP_COMPONENT_GAMMA] = MUTEX_MOD_GAMMA,
> + [DDP_COMPONENT_OD] = MUTEX_MOD_OD,
> + [DDP_COMPONENT_OVL0] = MUTEX_MOD_OVL0,
> + [DDP_COMPONENT_OVL1] = MUTEX_MOD_OVL1,
> + [DDP_COMPONENT_PWM0] = MUTEX_MOD_PWM0,
> + [DDP_COMPONENT_RDMA0] = MUTEX_MOD_RDMA0,
> + [DDP_COMPONENT_RDMA1] = MUTEX_MOD_RDMA1,
> + [DDP_COMPONENT_UFOE] = MUTEX_MOD_UFOE,
> +};
> +
> +void mtk_ddp_add_comp_to_path(void __iomem *config_regs, unsigned int pipe,
> + enum mtk_ddp_comp_id cur,
> + enum mtk_ddp_comp_id next)
Why pass pipe if we don't use it?
> +{
> + unsigned int addr, value;
> +
> + if (cur == DDP_COMPONENT_OVL0 && next == DDP_COMPONENT_COLOR0) {
> + addr = DISP_REG_CONFIG_DISP_OVL0_MOUT_EN;
> + value = OVL0_MOUT_EN_COLOR0;
> + } else if (cur == DDP_COMPONENT_OD && next == DDP_COMPONENT_RDMA0) {
> + addr = DISP_REG_CONFIG_DISP_OD_MOUT_EN;
> + value = OD_MOUT_EN_RDMA0;
> + } else if (cur == DDP_COMPONENT_UFOE && next == DDP_COMPONENT_DSI0) {
> + addr = DISP_REG_CONFIG_DISP_UFOE_MOUT_EN;
> + value = UFOE_MOUT_EN_DSI0;
> + } else if (cur == DDP_COMPONENT_OVL1 && next == DDP_COMPONENT_COLOR1) {
> + addr = DISP_REG_CONFIG_DISP_OVL1_MOUT_EN;
> + value = OVL1_MOUT_EN_COLOR1;
> + } else if (cur == DDP_COMPONENT_GAMMA && next == DDP_COMPONENT_RDMA1) {
> + addr = DISP_REG_CONFIG_DISP_GAMMA_MOUT_EN;
> + value = GAMMA_MOUT_EN_RDMA1;
> + } else if (cur == DDP_COMPONENT_RDMA1 && next == DDP_COMPONENT_DPI0) {
> + addr = DISP_REG_CONFIG_DISP_RDMA1_MOUT_EN;
> + value = RDMA1_MOUT_DPI0;
> + } else {
> + value = 0;
> + }
> + if (value) {
> + unsigned int reg = readl(config_regs + addr) | value;
> +
> + writel(reg, config_regs + addr);
Almost all of the writel() in this patch can really be writel_relaxed().
The only ones that need writel() are when you really need a barrier.
> + }
> +
> + if (cur == DDP_COMPONENT_OVL0 && next == DDP_COMPONENT_COLOR0) {
> + addr = DISP_REG_CONFIG_DISP_COLOR0_SEL_IN;
> + value = COLOR0_SEL_IN_OVL0;
> + } else if (cur == DDP_COMPONENT_RDMA1 && next == DDP_COMPONENT_DPI0) {
> + addr = DISP_REG_CONFIG_DPI_SEL_IN;
> + value = DPI0_SEL_IN_RDMA1;
> + } else if (cur == DDP_COMPONENT_OVL1 && next == DDP_COMPONENT_COLOR1) {
> + addr = DISP_REG_CONFIG_DISP_COLOR1_SEL_IN;
> + value = COLOR1_SEL_IN_OVL1;
> + } else {
> + value = 0;
> + }
> + if (value) {
> + unsigned int reg = readl(config_regs + addr) | value;
> +
> + writel(reg, config_regs + addr);
> + }
> +}
> +
> +void mtk_ddp_add_comp_to_mutex(struct device *dev, unsigned int pipe,
> + enum mtk_ddp_comp_id cur,
> + enum mtk_ddp_comp_id next)
> +{
> + struct mtk_ddp *ddp = dev_get_drvdata(dev);
> + unsigned int reg;
> +
> + reg = readl(ddp->mutex_regs + DISP_REG_MUTEX_MOD(pipe));
> + reg |= BIT(mutex_mod[cur]) | BIT(mutex_mod[next]);
> + writel(reg, ddp->mutex_regs + DISP_REG_MUTEX_MOD(pipe));
> +
> + if (next == DDP_COMPONENT_DPI0)
> + reg = MUTEX_SOF_DPI0;
> + else
> + reg = MUTEX_SOF_DSI0;
> +
> + writel(reg, ddp->mutex_regs + DISP_REG_MUTEX_SOF(pipe));
> + writel(1, ddp->mutex_regs + DISP_REG_MUTEX_EN(pipe));
> +}
> +
> +void mtk_ddp_clock_on(struct device *dev)
> +{
> + struct mtk_ddp *ddp = dev_get_drvdata(dev);
> + int ret;
> +
> + ret = clk_prepare_enable(ddp->mutex_disp_clk);
> + if (ret != 0)
> + DRM_ERROR("clk_prepare_enable(mutex_disp_clk) error!\n");
> +}
> +
> +void mtk_ddp_clock_off(struct device *dev)
> +{
> + struct mtk_ddp *ddp = dev_get_drvdata(dev);
> +
> + clk_disable_unprepare(ddp->mutex_disp_clk);
> +}
> +
> +static int mtk_ddp_probe(struct platform_device *pdev)
> +{
> + struct device *dev = &pdev->dev;
> + struct mtk_ddp *ddp;
> + struct resource *regs;
> +
> + ddp = devm_kzalloc(dev, sizeof(*ddp), GFP_KERNEL);
> + if (!ddp)
> + return -ENOMEM;
> +
> + ddp->mutex_disp_clk = devm_clk_get(dev, NULL);
> + if (IS_ERR(ddp->mutex_disp_clk)) {
> + dev_err(dev, "Failed to get clock\n");
> + return PTR_ERR(ddp->mutex_disp_clk);
> + }
> +
> + regs = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> + ddp->mutex_regs = devm_ioremap_resource(dev, regs);
> + if (IS_ERR(ddp->mutex_regs)) {
> + dev_err(dev, "Failed to map mutex registers\n");
> + return PTR_ERR(ddp->mutex_regs);
> + }
> +
> + platform_set_drvdata(pdev, ddp);
> +
> + return 0;
> +}
> +
> +static int mtk_ddp_remove(struct platform_device *pdev)
> +{
> + return 0;
> +}
> +
> +static const struct of_device_id ddp_driver_dt_match[] = {
> + { .compatible = "mediatek,mt8173-disp-mutex" },
> + {},
> +};
> +MODULE_DEVICE_TABLE(of, ddp_driver_dt_match);
> +
> +struct platform_driver mtk_ddp_driver = {
> + .probe = mtk_ddp_probe,
> + .remove = mtk_ddp_remove,
> + .driver = {
> + .name = "mediatek-ddp",
> + .owner = THIS_MODULE,
> + .of_match_table = ddp_driver_dt_match,
> + },
> +};
> +
> +module_platform_driver(mtk_ddp_driver);
> diff --git a/drivers/gpu/drm/mediatek/mtk_drm_ddp.h b/drivers/gpu/drm/mediatek/mtk_drm_ddp.h
> new file mode 100644
> index 0000000..55c2db3
> --- /dev/null
> +++ b/drivers/gpu/drm/mediatek/mtk_drm_ddp.h
> @@ -0,0 +1,39 @@
> +/*
> + * Copyright (c) 2015 MediaTek Inc.
> + *
> + * This program is free software; you can redistribute it and/or modify
> + * it under the terms of the GNU General Public License version 2 as
> + * published by the Free Software Foundation.
> + *
> + * This program is distributed in the hope that it will be useful,
> + * but WITHOUT ANY WARRANTY; without even the implied warranty of
> + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
> + * GNU General Public License for more details.
> + */
> +
> +#ifndef MTK_DRM_DDP_H
> +#define MTK_DRM_DDP_H
> +
> +#include "mtk_drm_ddp_comp.h"
> +
> +struct regmap;
> +struct device;
> +
> +struct mtk_ddp {
> + struct device *dev;
> + struct drm_device *drm_dev;
> +
> + struct clk *mutex_disp_clk;
> + void __iomem *mutex_regs;
> +};
> +
> +void mtk_ddp_add_comp_to_path(void __iomem *config_regs, unsigned int pipe,
> + enum mtk_ddp_comp_id cur,
> + enum mtk_ddp_comp_id next);
> +void mtk_ddp_add_comp_to_mutex(struct device *dev, unsigned int pipe,
> + enum mtk_ddp_comp_id cur,
> + enum mtk_ddp_comp_id next);
> +void mtk_ddp_clock_on(struct device *dev);
> +void mtk_ddp_clock_off(struct device *dev);
> +
> +#endif /* MTK_DRM_DDP_H */
> diff --git a/drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.c b/drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.c
> new file mode 100644
> index 0000000..2f3b32b
> --- /dev/null
> +++ b/drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.c
> @@ -0,0 +1,424 @@
> +/*
> + * Copyright (c) 2015 MediaTek Inc.
> + * Authors:
> + * YT Shen <yt.shen at mediatek.com>
> + * CK Hu <ck.hu at mediatek.com>
> + *
> + * This program is free software; you can redistribute it and/or modify
> + * it under the terms of the GNU General Public License version 2 as
> + * published by the Free Software Foundation.
> + *
> + * This program is distributed in the hope that it will be useful,
> + * but WITHOUT ANY WARRANTY; without even the implied warranty of
> + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
> + * GNU General Public License for more details.
> + */
> +
> +#include <linux/clk.h>
> +#include <linux/of_address.h>
> +#include <linux/of_irq.h>
> +#include <drm/drmP.h>
> +#include "mtk_drm_ddp_comp.h"
> +
> +#define DISP_REG_OVL_INTEN 0x0004
> +#define DISP_REG_OVL_INTSTA 0x0008
> +#define DISP_REG_OVL_EN 0x000c
> +#define DISP_REG_OVL_RST 0x0014
> +#define DISP_REG_OVL_ROI_SIZE 0x0020
> +#define DISP_REG_OVL_ROI_BGCLR 0x0028
> +#define DISP_REG_OVL_SRC_CON 0x002c
> +#define DISP_REG_OVL_CON(n) (0x0030 + 0x20 * n)
> +#define DISP_REG_OVL_SRC_SIZE(n) (0x0038 + 0x20 * n)
> +#define DISP_REG_OVL_OFFSET(n) (0x003c + 0x20 * n)
> +#define DISP_REG_OVL_PITCH(n) (0x0044 + 0x20 * n)
> +#define DISP_REG_OVL_RDMA_CTRL(n) (0x00c0 + 0x20 * n)
> +#define DISP_REG_OVL_RDMA_GMC(n) (0x00c8 + 0x20 * n)
> +#define DISP_REG_OVL_ADDR(n) (0x0f40 + 0x20 * n)
> +
> +#define DISP_REG_RDMA_INT_ENABLE 0x0000
> +#define DISP_REG_RDMA_INT_STATUS 0x0004
> +#define DISP_REG_RDMA_GLOBAL_CON 0x0010
> +#define DISP_REG_RDMA_SIZE_CON_0 0x0014
> +#define DISP_REG_RDMA_SIZE_CON_1 0x0018
> +#define DISP_REG_RDMA_FIFO_CON 0x0040
> +#define RDMA_FIFO_UNDERFLOW_EN BIT(31)
> +#define RDMA_FIFO_PSEUDO_SIZE(bytes) (((bytes) / 16) << 16)
> +#define RDMA_OUTPUT_VALID_FIFO_THRESHOLD(bytes) ((bytes) / 16)
> +
> +#define DISP_OD_EN 0x0000
> +#define DISP_OD_INTEN 0x0008
> +#define DISP_OD_INTSTA 0x000c
> +#define DISP_OD_CFG 0x0020
> +#define DISP_OD_SIZE 0x0030
> +
> +#define DISP_REG_UFO_START 0x0000
> +
> +#define DISP_COLOR_CFG_MAIN 0x0400
> +#define DISP_COLOR_START 0x0c00
> +
> +enum OVL_INPUT_FORMAT {
> + OVL_INFMT_RGB565 = 0,
> + OVL_INFMT_RGB888 = 1,
> + OVL_INFMT_RGBA8888 = 2,
> + OVL_INFMT_ARGB8888 = 3,
> +};
> +
> +#define OVL_RDMA_MEM_GMC 0x40402020
> +#define OVL_AEN BIT(8)
> +#define OVL_ALPHA 0xff
> +
> +#define OD_RELAY_MODE BIT(0)
> +
> +#define UFO_BYPASS BIT(2)
> +
> +#define COLOR_BYPASS_ALL BIT(7)
> +#define COLOR_SEQ_SEL BIT(13)
> +
> +static void mtk_color_start(void __iomem *color_base)
> +{
> + writel(COLOR_BYPASS_ALL | COLOR_SEQ_SEL,
> + color_base + DISP_COLOR_CFG_MAIN);
> + writel(0x1, color_base + DISP_COLOR_START);
> +}
> +
> +static void mtk_od_config(void __iomem *od_base, unsigned int w, unsigned int h,
> + unsigned int vrefresh)
> +{
> + writel(w << 16 | h, od_base + DISP_OD_SIZE);
> +}
> +
> +static void mtk_od_start(void __iomem *od_base)
> +{
> + writel(OD_RELAY_MODE, od_base + DISP_OD_CFG);
> + writel(1, od_base + DISP_OD_EN);
> +}
> +
> +static void mtk_ovl_enable_vblank(void __iomem *disp_base)
> +{
> + writel(0x2, disp_base + DISP_REG_OVL_INTEN);
> +}
> +
> +static void mtk_ovl_disable_vblank(void __iomem *disp_base)
> +{
> + writel(0x0, disp_base + DISP_REG_OVL_INTEN);
> +}
> +
> +static void mtk_ovl_clear_vblank(void __iomem *disp_base)
> +{
> + writel(0x0, disp_base + DISP_REG_OVL_INTSTA);
> +}
> +
> +static void mtk_ovl_start(void __iomem *ovl_base)
> +{
> + writel(0x1, ovl_base + DISP_REG_OVL_EN);
> +}
> +
> +static void mtk_ovl_config(void __iomem *ovl_base,
> + unsigned int w, unsigned int h, unsigned int vrefresh)
> +{
> + if (w != 0 && h != 0)
> + writel(h << 16 | w, ovl_base + DISP_REG_OVL_ROI_SIZE);
Should you just write 0 to DISP_REG_OVL_ROI_SIZE if w or h are 0?
> + writel(0x0, ovl_base + DISP_REG_OVL_ROI_BGCLR);
> +
> + writel(0x1, ovl_base + DISP_REG_OVL_RST);
> + writel(0x0, ovl_base + DISP_REG_OVL_RST);
> +}
> +
> +static bool has_rb_swapped(unsigned int fmt)
> +{
> + switch (fmt) {
> + case DRM_FORMAT_BGR888:
> + case DRM_FORMAT_BGR565:
> + case DRM_FORMAT_ABGR8888:
> + case DRM_FORMAT_XBGR8888:
> + case DRM_FORMAT_BGRA8888:
> + case DRM_FORMAT_BGRX8888:
> + return true;
> + default:
> + return false;
> + }
> +}
> +
> +static unsigned int ovl_fmt_convert(unsigned int fmt)
return int so the error code stays negative?
> +{
> + switch (fmt) {
> + case DRM_FORMAT_RGB888:
> + case DRM_FORMAT_BGR888:
> + return OVL_INFMT_RGB888;
> + case DRM_FORMAT_RGB565:
> + case DRM_FORMAT_BGR565:
> + return OVL_INFMT_RGB565;
> + case DRM_FORMAT_RGBX8888:
> + case DRM_FORMAT_RGBA8888:
> + case DRM_FORMAT_BGRX8888:
> + case DRM_FORMAT_BGRA8888:
> + return OVL_INFMT_ARGB8888;
> + case DRM_FORMAT_XRGB8888:
> + case DRM_FORMAT_ARGB8888:
> + case DRM_FORMAT_XBGR8888:
> + case DRM_FORMAT_ABGR8888:
> + return OVL_INFMT_RGBA8888;
> + default:
> + DRM_ERROR("unsupport format[%08x]\n", fmt);
> + return -EINVAL;
> + }
> +}
> +
> +static void mtk_ovl_layer_on(void __iomem *ovl_base, unsigned int idx)
> +{
> + unsigned int reg;
> +
> + writel(0x1, ovl_base + DISP_REG_OVL_RDMA_CTRL(idx));
> + writel(OVL_RDMA_MEM_GMC, ovl_base + DISP_REG_OVL_RDMA_GMC(idx));
> +
> + reg = readl(ovl_base + DISP_REG_OVL_SRC_CON);
> + reg = reg | (1 << idx);
> + writel(reg, ovl_base + DISP_REG_OVL_SRC_CON);
> +}
> +
> +static void mtk_ovl_layer_off(void __iomem *ovl_base, unsigned int idx)
> +{
> + unsigned int reg;
> +
> + reg = readl(ovl_base + DISP_REG_OVL_SRC_CON);
> + reg = reg & ~(1 << idx);
> + writel(reg, ovl_base + DISP_REG_OVL_SRC_CON);
> +
> + writel(0x0, ovl_base + DISP_REG_OVL_RDMA_CTRL(idx));
> +}
> +
> +static void mtk_ovl_layer_config(void __iomem *ovl_base, unsigned int idx,
> + unsigned int addr, unsigned int pitch, unsigned int fmt,
> + int x, int y, unsigned int size)
> +{
> + unsigned int reg;
> +
> + reg = has_rb_swapped(fmt) << 24 | ovl_fmt_convert(fmt) << 12;
ovl_fmt_convert() can return < 0 for unsupported fmt.
But, perhaps we can remove that check, since it should actually
already be guaranteed by the drm core that a plane is only ever asked
to display an FB with a format that the plane advertises.
> + if (idx != 0)
> + reg |= OVL_AEN | OVL_ALPHA;
> +
> + writel(reg, ovl_base + DISP_REG_OVL_CON(idx));
> + writel(pitch & 0xFFFF, ovl_base + DISP_REG_OVL_PITCH(idx));
> + writel(size, ovl_base + DISP_REG_OVL_SRC_SIZE(idx));
> + writel(y << 16 | x, ovl_base + DISP_REG_OVL_OFFSET(idx));
> + writel(addr, ovl_base + DISP_REG_OVL_ADDR(idx));
> +}
> +
> +static void mtk_rdma_start(void __iomem *rdma_base)
> +{
> + unsigned int reg;
> +
> + writel(0x4, rdma_base + DISP_REG_RDMA_INT_ENABLE);
> + reg = readl(rdma_base + DISP_REG_RDMA_GLOBAL_CON);
> + reg |= 1;
> + writel(reg, rdma_base + DISP_REG_RDMA_GLOBAL_CON);
> +}
> +
> +static void mtk_rdma_config(void __iomem *rdma_base,
> + unsigned width, unsigned height, unsigned int vrefresh)
> +{
> + unsigned int threshold;
> + unsigned int reg;
> +
> + reg = readl(rdma_base + DISP_REG_RDMA_SIZE_CON_0);
> + reg = (reg & ~(0xFFF)) | (width & 0xFFF);
> + writel(reg, rdma_base + DISP_REG_RDMA_SIZE_CON_0);
> +
> + reg = readl(rdma_base + DISP_REG_RDMA_SIZE_CON_1);
> + reg = (reg & ~(0xFFFFF)) | (height & 0xFFFFF);
> + writel(reg, rdma_base + DISP_REG_RDMA_SIZE_CON_1);
> +
> + /*
> + * Enable FIFO underflow since DSI and DPI can't be blocked.
> + * Keep the FIFO pseudo size reset default of 8 KiB. Set the
> + * output threshold to 6 microseconds with 7/6 overhead to
> + * account for blanking, and with a pixel depth of 4 bytes:
> + */
> + threshold = width * height * vrefresh * 4 * 7 / 1000000;
> + reg = RDMA_FIFO_UNDERFLOW_EN |
> + RDMA_FIFO_PSEUDO_SIZE(SZ_8K) |
> + RDMA_OUTPUT_VALID_FIFO_THRESHOLD(threshold);
> + writel(reg, rdma_base + DISP_REG_RDMA_FIFO_CON);
> +}
> +
> +static void mtk_ufoe_start(void __iomem *ufoe_base)
> +{
> + writel(UFO_BYPASS, ufoe_base + DISP_REG_UFO_START);
> +}
> +
> +static const struct mtk_ddp_comp_funcs ddp_aal = {
> + .comp_id = DDP_COMPONENT_AAL,
> +};
> +
> +static const struct mtk_ddp_comp_funcs ddp_color0 = {
> + .comp_id = DDP_COMPONENT_COLOR0,
> + .comp_power_on = mtk_color_start,
For consistency, can you name all of the "*_start()" functions
"*_power_on", or change the .comp_power_on to .comp_start.
Actually, just drop the "comp_" from all of the fields of
mtk_ddp_comp_funcs, since it is redundant.
> +};
> +
> +static const struct mtk_ddp_comp_funcs ddp_color1 = {
> + .comp_id = DDP_COMPONENT_COLOR1,
> + .comp_power_on = mtk_color_start,
> +};
> +
> +static const struct mtk_ddp_comp_funcs ddp_dpi0 = {
> + .comp_id = DDP_COMPONENT_DPI0,
> +};
> +
> +static const struct mtk_ddp_comp_funcs ddp_dsi0 = {
> + .comp_id = DDP_COMPONENT_DSI0,
> +};
> +
> +static const struct mtk_ddp_comp_funcs ddp_dsi1 = {
> + .comp_id = DDP_COMPONENT_DSI1,
> +};
> +
> +static const struct mtk_ddp_comp_funcs ddp_gamma = {
> + .comp_id = DDP_COMPONENT_GAMMA,
> +};
> +
> +static const struct mtk_ddp_comp_funcs ddp_od = {
> + .comp_id = DDP_COMPONENT_OD,
> + .comp_config = mtk_od_config,
> + .comp_power_on = mtk_od_start,
> +};
> +
> +static const struct mtk_ddp_comp_funcs ddp_ovl0 = {
> + .comp_id = DDP_COMPONENT_OVL0,
> + .comp_config = mtk_ovl_config,
> + .comp_power_on = mtk_ovl_start,
> + .comp_enable_vblank = mtk_ovl_enable_vblank,
> + .comp_disable_vblank = mtk_ovl_disable_vblank,
> + .comp_clear_vblank = mtk_ovl_clear_vblank,
> + .comp_layer_on = mtk_ovl_layer_on,
> + .comp_layer_off = mtk_ovl_layer_off,
> + .comp_layer_config = mtk_ovl_layer_config,
> +};
> +
> +static const struct mtk_ddp_comp_funcs ddp_ovl1 = {
> + .comp_id = DDP_COMPONENT_OVL1,
> + .comp_config = mtk_ovl_config,
> + .comp_power_on = mtk_ovl_start,
> + .comp_enable_vblank = mtk_ovl_enable_vblank,
> + .comp_disable_vblank = mtk_ovl_disable_vblank,
> + .comp_clear_vblank = mtk_ovl_clear_vblank,
> + .comp_layer_on = mtk_ovl_layer_on,
> + .comp_layer_off = mtk_ovl_layer_off,
> + .comp_layer_config = mtk_ovl_layer_config,
> +};
The callback duplication here suggests the component model can be refined a bit.
I think you probably want a single one of these:
static const struct mtk_ddp_comp_funcs ddp_ovl = {
.config = mtk_ovl_config,
.start = mtk_ovl_start,
.enable_vblank = mtk_ovl_enable_vblank,
.disable_vblank = mtk_ovl_disable_vblank,
.clear_vblank = mtk_ovl_clear_vblank,
.layer_on = mtk_ovl_layer_on,
.layer_off = mtk_ovl_layer_off,
.layer_config = mtk_ovl_layer_config,
};
and then to use it for both ovl's. Maybe something like this:
static const struct mtk_ddp_comp_desc ddp_ovl0 = {
.id = DDP_COMPONENT_OVL0,
.ops = ddp_ovl
};
static const struct mtk_ddp_comp_desc ddp_ovl1 = {
.id = DDP_COMPONENT_OVL1,
.ops = ddp_ovl
};
> +
> +static const struct mtk_ddp_comp_funcs ddp_pwm0 = {
> + .comp_id = DDP_COMPONENT_PWM0,
> +};
> +
> +static const struct mtk_ddp_comp_funcs ddp_rdma0 = {
> + .comp_id = DDP_COMPONENT_RDMA0,
> + .comp_config = mtk_rdma_config,
> + .comp_power_on = mtk_rdma_start,
> +};
> +
> +static const struct mtk_ddp_comp_funcs ddp_rdma1 = {
> + .comp_id = DDP_COMPONENT_RDMA1,
> + .comp_config = mtk_rdma_config,
> + .comp_power_on = mtk_rdma_start,
> +};
> +
> +static const struct mtk_ddp_comp_funcs ddp_rdma2 = {
> + .comp_id = DDP_COMPONENT_RDMA2,
> + .comp_config = mtk_rdma_config,
> + .comp_power_on = mtk_rdma_start,
> +};
> +
> +static const struct mtk_ddp_comp_funcs ddp_ufoe = {
> + .comp_id = DDP_COMPONENT_UFOE,
> + .comp_power_on = mtk_ufoe_start,
> +};
> +
> +static const struct mtk_ddp_comp_funcs ddp_wdma0 = {
> + .comp_id = DDP_COMPONENT_WDMA0,
> +};
> +
> +static const struct mtk_ddp_comp_funcs ddp_wdma1 = {
> + .comp_id = DDP_COMPONENT_WDMA1,
> +};
> +
> +static const char * const mtk_ddp_comp_stem[MTK_DDP_COMP_TYPE_MAX] = {
> + [MTK_DISP_OVL] = "ovl",
> + [MTK_DISP_RDMA] = "rdma",
> + [MTK_DISP_WDMA] = "wdma",
> + [MTK_DISP_COLOR] = "color",
> + [MTK_DISP_AAL] = "aal",
> + [MTK_DISP_GAMMA] = "gamma",
> + [MTK_DISP_UFOE] = "ufoe",
> + [MTK_DSI] = "dsi",
> + [MTK_DPI] = "dpi",
> + [MTK_DISP_PWM] = "pwm",
> + [MTK_DISP_MUTEX] = "mutex",
> + [MTK_DISP_OD] = "od",
> +};
> +
> +struct mtk_ddp_comp_match {
> + enum mtk_ddp_comp_type type;
> + int alias_id;
> + const struct mtk_ddp_comp_funcs *funcs;
> +};
> +
> +static struct mtk_ddp_comp_match mtk_ddp_matches[DDP_COMPONENT_ID_MAX] = {
> + [DDP_COMPONENT_AAL] = { MTK_DISP_AAL, 0, &ddp_aal },
> + [DDP_COMPONENT_COLOR0] = { MTK_DISP_COLOR, 0, &ddp_color0 },
> + [DDP_COMPONENT_COLOR1] = { MTK_DISP_COLOR, 1, &ddp_color1 },
> + [DDP_COMPONENT_DPI0] = { MTK_DPI, 0, &ddp_dpi0 },
> + [DDP_COMPONENT_DSI0] = { MTK_DSI, 0, &ddp_dsi0 },
> + [DDP_COMPONENT_DSI1] = { MTK_DSI, 1, &ddp_dsi1 },
> + [DDP_COMPONENT_GAMMA] = { MTK_DISP_GAMMA, 0, &ddp_gamma },
> + [DDP_COMPONENT_OD] = { MTK_DISP_OD, 0, &ddp_od },
> + [DDP_COMPONENT_OVL0] = { MTK_DISP_OVL, 0, &ddp_ovl0 },
> + [DDP_COMPONENT_OVL1] = { MTK_DISP_OVL, 1, &ddp_ovl1 },
> + [DDP_COMPONENT_PWM0] = { MTK_DISP_PWM, 0, &ddp_pwm0 },
> + [DDP_COMPONENT_RDMA0] = { MTK_DISP_RDMA, 0, &ddp_rdma0 },
> + [DDP_COMPONENT_RDMA1] = { MTK_DISP_RDMA, 1, &ddp_rdma1 },
> + [DDP_COMPONENT_RDMA2] = { MTK_DISP_RDMA, 2, &ddp_rdma2 },
> + [DDP_COMPONENT_UFOE] = { MTK_DISP_UFOE, 0, &ddp_ufoe },
> + [DDP_COMPONENT_WDMA0] = { MTK_DISP_WDMA, 0, &ddp_wdma0 },
> + [DDP_COMPONENT_WDMA1] = { MTK_DISP_WDMA, 1, &ddp_wdma1 },
> +};
> +
> +int mtk_ddp_comp_get_id(struct device_node *node,
> + enum mtk_ddp_comp_type comp_type)
> +{
> + int id = of_alias_get_id(node, mtk_ddp_comp_stem[comp_type]);
> + int i;
> +
> + for (i = 0; i < ARRAY_SIZE(mtk_ddp_matches); i++) {
> + if (comp_type == mtk_ddp_matches[i].type &&
> + (id < 0 || id == mtk_ddp_matches[i].alias_id))
> + return i;
> + }
> +
> + return -EINVAL;
> +}
> +
> +int mtk_ddp_comp_init(struct device_node *node, struct mtk_ddp_comp *comp,
> + enum mtk_ddp_comp_id comp_id)
> +{
> + if (comp_id < 0 || comp_id >= DDP_COMPONENT_ID_MAX)
> + return -EINVAL;
> +
> + comp->funcs = mtk_ddp_matches[comp_id].funcs;
> +
> + if (comp_id == DDP_COMPONENT_DPI0 ||
> + comp_id == DDP_COMPONENT_DSI0 ||
> + comp_id == DDP_COMPONENT_PWM0) {
> + comp->regs = NULL;
> + comp->clk = NULL;
> + comp->irq = 0;
> + return 0;
> + }
> +
> + comp->regs = of_iomap(node, 0);
> + comp->irq = of_irq_get(node, 0);
> + comp->clk = of_clk_get(node, 0);
> + if (IS_ERR(comp->clk))
> + comp->clk = NULL;
> +
> + return 0;
> +}
> diff --git a/drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.h b/drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.h
> new file mode 100644
> index 0000000..ae3a6e8
> --- /dev/null
> +++ b/drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.h
> @@ -0,0 +1,86 @@
> +/*
> + * Copyright (c) 2015 MediaTek Inc.
> + *
> + * This program is free software; you can redistribute it and/or modify
> + * it under the terms of the GNU General Public License version 2 as
> + * published by the Free Software Foundation.
> + *
> + * This program is distributed in the hope that it will be useful,
> + * but WITHOUT ANY WARRANTY; without even the implied warranty of
> + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
> + * GNU General Public License for more details.
> + */
> +
> +#ifndef MTK_DRM_DDP_COMP_H
> +#define MTK_DRM_DDP_COMP_H
> +
> +#include <linux/io.h>
> +
> +struct device_node;
> +
> +enum mtk_ddp_comp_type {
> + MTK_DISP_OVL,
> + MTK_DISP_RDMA,
> + MTK_DISP_WDMA,
> + MTK_DISP_COLOR,
> + MTK_DISP_AAL,
> + MTK_DISP_GAMMA,
> + MTK_DISP_UFOE,
> + MTK_DSI,
> + MTK_DPI,
> + MTK_DISP_PWM,
> + MTK_DISP_MUTEX,
> + MTK_DISP_OD,
> + MTK_DDP_COMP_TYPE_MAX,
> +};
> +
> +enum mtk_ddp_comp_id {
> + DDP_COMPONENT_AAL,
> + DDP_COMPONENT_COLOR0,
> + DDP_COMPONENT_COLOR1,
> + DDP_COMPONENT_DPI0,
> + DDP_COMPONENT_DSI0,
> + DDP_COMPONENT_DSI1,
> + DDP_COMPONENT_GAMMA,
> + DDP_COMPONENT_OD,
> + DDP_COMPONENT_OVL0,
> + DDP_COMPONENT_OVL1,
> + DDP_COMPONENT_PWM0,
> + DDP_COMPONENT_RDMA0,
> + DDP_COMPONENT_RDMA1,
> + DDP_COMPONENT_RDMA2,
> + DDP_COMPONENT_UFOE,
> + DDP_COMPONENT_WDMA0,
> + DDP_COMPONENT_WDMA1,
> + DDP_COMPONENT_ID_MAX,
> +};
> +
> +struct mtk_ddp_comp_funcs {
> + enum mtk_ddp_comp_id comp_id;
> + void (*comp_config)(void __iomem *ovl_base,
> + unsigned int w, unsigned int h, unsigned int vrefresh);
> + void (*comp_power_on)(void __iomem *ovl_base);
> + void (*comp_power_off)(void __iomem *ovl_base);
> + void (*comp_enable_vblank)(void __iomem *ovl_base);
> + void (*comp_disable_vblank)(void __iomem *ovl_base);
> + void (*comp_clear_vblank)(void __iomem *ovl_base);
> + void (*comp_layer_on)(void __iomem *ovl_base, unsigned int idx);
> + void (*comp_layer_off)(void __iomem *ovl_base, unsigned int idx);
> + void (*comp_layer_config)(void __iomem *ovl_base, unsigned int idx,
> + unsigned int addr, unsigned int pitch, unsigned int fmt,
> + int x, int y, unsigned int size);
> +};
> +
> +struct mtk_ddp_comp {
> + struct clk *clk;
> + void __iomem *regs;
> + int irq;
> + const struct mtk_ddp_comp_funcs *funcs;
> +};
> +
> +int mtk_ddp_comp_get_id(struct device_node *node,
> + enum mtk_ddp_comp_type comp_type);
> +int mtk_ddp_comp_init(struct device_node *node, struct mtk_ddp_comp *comp,
> + enum mtk_ddp_comp_id comp_id);
> +
> +#endif /* MTK_DRM_DDP_COMP_H */
> diff --git a/drivers/gpu/drm/mediatek/mtk_drm_drv.c b/drivers/gpu/drm/mediatek/mtk_drm_drv.c
> new file mode 100644
> index 0000000..fbca99f
> --- /dev/null
> +++ b/drivers/gpu/drm/mediatek/mtk_drm_drv.c
> @@ -0,0 +1,572 @@
> +/*
> + * Copyright (c) 2015 MediaTek Inc.
> + * Author: YT SHEN <yt.shen at mediatek.com>
> + *
> + * This program is free software; you can redistribute it and/or modify
> + * it under the terms of the GNU General Public License version 2 as
> + * published by the Free Software Foundation.
> + *
> + * This program is distributed in the hope that it will be useful,
> + * but WITHOUT ANY WARRANTY; without even the implied warranty of
> + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
> + * GNU General Public License for more details.
> + */
> +
> +#include <drm/drmP.h>
> +#include <drm/drm_atomic.h>
> +#include <drm/drm_atomic_helper.h>
> +#include <drm/drm_crtc_helper.h>
> +#include <drm/drm_gem.h>
> +#include <linux/component.h>
> +#include <linux/dma-iommu.h>
> +#include <linux/of_address.h>
> +#include <linux/of_platform.h>
> +#include <linux/pm_runtime.h>
> +#include <soc/mediatek/smi.h>
> +
> +#include "mtk_drm_crtc.h"
> +#include "mtk_drm_ddp_comp.h"
> +#include "mtk_drm_drv.h"
> +#include "mtk_drm_fb.h"
> +#include "mtk_drm_gem.h"
> +
> +#define DRIVER_NAME "mediatek"
> +#define DRIVER_DESC "Mediatek SoC DRM"
> +#define DRIVER_DATE "20150513"
> +#define DRIVER_MAJOR 1
> +#define DRIVER_MINOR 0
> +
> +static void mtk_atomic_schedule(struct mtk_drm_private *private,
> + struct drm_atomic_state *state)
> +{
> + private->commit.state = state;
> + schedule_work(&private->commit.work);
> +}
> +
> +static void mtk_atomic_complete(struct mtk_drm_private *private,
> + struct drm_atomic_state *state)
> +{
> + struct drm_device *drm = private->drm;
> +
> + drm_atomic_helper_commit_modeset_disables(drm, state);
> + drm_atomic_helper_commit_planes(drm, state);
> + drm_atomic_helper_commit_modeset_enables(drm, state);
> + drm_atomic_helper_wait_for_vblanks(drm, state);
Why wait for vblank here?
Are you sure we waited long enough here?
This will return after the very next vblank.
However, what guarantees that the new state was really transferred to
the hardware in time?
> + drm_atomic_helper_cleanup_planes(drm, state);
> + drm_atomic_state_free(state);
> +}
> +
> +static void mtk_atomic_work(struct work_struct *work)
> +{
> + struct mtk_drm_private *private = container_of(work,
> + struct mtk_drm_private, commit.work);
> +
> + mtk_atomic_complete(private, private->commit.state);
> +}
> +
> +static int mtk_atomic_commit(struct drm_device *drm,
> + struct drm_atomic_state *state,
> + bool async)
> +{
> + struct mtk_drm_private *private = drm->dev_private;
> + int ret;
> +
> + ret = drm_atomic_helper_prepare_planes(drm, state);
> + if (ret)
> + return ret;
> +
> + mutex_lock(&private->commit.lock);
> + flush_work(&private->commit.work);
> +
> + drm_atomic_helper_swap_state(drm, state);
> +
> + if (async)
> + mtk_atomic_schedule(private, state);
> + else
> + mtk_atomic_complete(private, state);
> +
> + mutex_unlock(&private->commit.lock);
What does this lock do?
AFAICT, it only ensures that the second half of mtk_atomic_commit()
cannot execute twice at the same time.
However, I expect simultaneous calls to atomic_commit() should already
be prohibited by the drm core?
> +
> + return 0;
> +}
> +
> +static const struct drm_mode_config_funcs mtk_drm_mode_config_funcs = {
> + .fb_create = mtk_drm_mode_fb_create,
> + .atomic_check = drm_atomic_helper_check,
> + .atomic_commit = mtk_atomic_commit,
> +};
> +
> +static const enum mtk_ddp_comp_id mtk_ddp_main[] = {
> + DDP_COMPONENT_OVL0,
> + DDP_COMPONENT_COLOR0,
> + DDP_COMPONENT_AAL,
> + DDP_COMPONENT_OD,
> + DDP_COMPONENT_RDMA0,
> + DDP_COMPONENT_UFOE,
> + DDP_COMPONENT_DSI0,
> + DDP_COMPONENT_PWM0,
> +};
> +
> +static const enum mtk_ddp_comp_id mtk_ddp_ext[] = {
> + DDP_COMPONENT_OVL1,
> + DDP_COMPONENT_COLOR1,
> + DDP_COMPONENT_GAMMA,
> + DDP_COMPONENT_RDMA1,
> + DDP_COMPONENT_DPI0,
> +};
> +
> +static int mtk_drm_kms_init(struct drm_device *drm)
> +{
> + struct mtk_drm_private *private = drm->dev_private;
> + struct platform_device *pdev;
> + int ret;
> + int i;
> +
> + pdev = of_find_device_by_node(private->mutex_node);
> + if (!pdev) {
> + dev_err(drm->dev, "Waiting for disp-mutex device %s\n",
> + private->mutex_node->full_name);
> + of_node_put(private->mutex_node);
> + return -EPROBE_DEFER;
> + }
> + private->mutex_dev = &pdev->dev;
> +
> + for (i = 0; i < MAX_CRTC; i++) {
> + if (!private->larb_node[i])
> + break;
> +
> + pdev = of_find_device_by_node(private->larb_node[i]);
> + if (!pdev) {
> + dev_err(drm->dev, "Waiting for larb device %s\n",
> + private->larb_node[i]->full_name);
Nit: dev_warn() perhaps?
> + return -EPROBE_DEFER;
> + }
> + private->larb_dev[i] = &pdev->dev;
> + }
> +
> + drm_mode_config_init(drm);
> +
> + drm->mode_config.min_width = 64;
> + drm->mode_config.min_height = 64;
> +
> + /*
> + * set max width and height as default value(4096x4096).
> + * this value would be used to check framebuffer size limitation
> + * at drm_mode_addfb().
> + */
> + drm->mode_config.max_width = 4096;
> + drm->mode_config.max_height = 4096;
> + drm->mode_config.funcs = &mtk_drm_mode_config_funcs;
> +
> + /*
> + * We currently support two fixed data streams,
> + * OVL0 -> COLOR0 -> AAL -> OD -> RDMA0 -> UFOE -> DSI0
> + * and OVL1 -> COLOR1 -> GAMMA -> RDMA1 -> DPI0.
> + */
> + private->path_len[0] = ARRAY_SIZE(mtk_ddp_main);
> + private->path[0] = mtk_ddp_main;
> + private->path_len[1] = ARRAY_SIZE(mtk_ddp_ext);
> + private->path[1] = mtk_ddp_ext;
> +
> + ret = component_bind_all(drm->dev, drm);
> + if (ret)
> + goto err_crtc;
> +
> + /*
> + * We don't use the drm_irq_install() helpers provided by the DRM
> + * core, so we need to set this manually in order to allow the
> + * DRM_IOCTL_WAIT_VBLANK to operate correctly.
> + */
> + drm->irq_enabled = true;
> + ret = drm_vblank_init(drm, MAX_CRTC);
> + if (ret < 0)
> + goto err_unbind;
> +
> + for (i = 0; i < MAX_CRTC; i++) {
> + if (!private->larb_dev[i])
> + break;
> +
> + ret = mtk_smi_larb_get(private->larb_dev[i]);
Hmm. this looks like it should be done by a crtc function, and, only
for CRTCs that are actually going to be used.
> + if (ret) {
> + DRM_ERROR("Failed to get larb: %d\n", ret);
> + goto err_larb_get;
> + }
> + }
> +
> + drm_kms_helper_poll_init(drm);
> + drm_mode_config_reset(drm);
> +
> + return 0;
> +
> +err_larb_get:
> + for (i = i - 1; i >= 0; i--)
> + mtk_smi_larb_put(private->larb_dev[i]);
> + drm_kms_helper_poll_fini(drm);
Not drm_kms_helper_poll_fini().
> + drm_vblank_cleanup(drm);
> +err_unbind:
> + component_unbind_all(drm->dev, drm);
> +err_crtc:
> + drm_mode_config_cleanup(drm);
> +
> + return ret;
> +}
> +
> +static void mtk_drm_kms_deinit(struct drm_device *drm)
> +{
put the larbs?
> + drm_kms_helper_poll_fini(drm);
> +
> + drm_vblank_cleanup(drm);
unbind_all ?
> + drm_mode_config_cleanup(drm);
> +}
> +
> +static int mtk_drm_unload(struct drm_device *drm)
> +{
> + mtk_drm_kms_deinit(drm);
> + drm->dev_private = NULL;
> +
> + return 0;
> +}
> +
> +static const struct vm_operations_struct mtk_drm_gem_vm_ops = {
> + .open = drm_gem_vm_open,
> + .close = drm_gem_vm_close,
> +};
> +
> +static const struct file_operations mtk_drm_fops = {
> + .owner = THIS_MODULE,
> + .open = drm_open,
> + .release = drm_release,
> + .unlocked_ioctl = drm_ioctl,
> + .mmap = mtk_drm_gem_mmap,
> + .poll = drm_poll,
> + .read = drm_read,
> +#ifdef CONFIG_COMPAT
> + .compat_ioctl = drm_compat_ioctl,
> +#endif
> +};
> +
> +static struct drm_driver mtk_drm_driver = {
> + .driver_features = DRIVER_MODESET | DRIVER_GEM,
| DRIVER_ATOMIC ?
> + .unload = mtk_drm_unload,
> + .set_busid = drm_platform_set_busid,
> +
> + .get_vblank_counter = drm_vblank_count,
> + .enable_vblank = mtk_drm_crtc_enable_vblank,
> + .disable_vblank = mtk_drm_crtc_disable_vblank,
> +
> + .gem_free_object = mtk_drm_gem_free_object,
> + .gem_vm_ops = &mtk_drm_gem_vm_ops,
> + .dumb_create = mtk_drm_gem_dumb_create,
> + .dumb_map_offset = mtk_drm_gem_dumb_map_offset,
> + .dumb_destroy = drm_gem_dumb_destroy,
> +
> + .fops = &mtk_drm_fops,
> +
> + .set_busid = drm_platform_set_busid,
> +
> + .name = DRIVER_NAME,
> + .desc = DRIVER_DESC,
> + .date = DRIVER_DATE,
> + .major = DRIVER_MAJOR,
> + .minor = DRIVER_MINOR,
> +};
> +
> +static int compare_of(struct device *dev, void *data)
> +{
> + return dev->of_node == data;
> +}
> +
> +static int mtk_drm_bind(struct device *dev)
> +{
> + struct mtk_drm_private *private = dev_get_drvdata(dev);
> + struct drm_device *drm;
> + int ret;
> +
> + drm = drm_dev_alloc(&mtk_drm_driver, dev);
> + if (!drm)
> + return -ENOMEM;
> +
> + drm_dev_set_unique(drm, dev_name(dev));
> +
> + ret = drm_dev_register(drm, 0);
> + if (ret < 0)
> + goto err_free;
> +
> + drm->dev_private = private;
> + private->drm = drm;
> +
> + ret = mtk_drm_kms_init(drm);
> + if (ret < 0)
> + goto err_unregister;
> +
> + return 0;
> +
> +err_unregister:
> + drm_dev_unregister(drm);
> +err_free:
> + drm_dev_unref(drm);
> + return ret;
> +}
> +
> +static void mtk_drm_unbind(struct device *dev)
> +{
> + struct mtk_drm_private *private = dev_get_drvdata(dev);
> +
> + drm_put_dev(private->drm);
> + private->drm = NULL;
> +}
> +
> +static const struct component_master_ops mtk_drm_ops = {
> + .bind = mtk_drm_bind,
> + .unbind = mtk_drm_unbind,
> +};
> +
> +static const struct of_device_id mtk_ddp_comp_dt_ids[] = {
> + { .compatible = "mediatek,mt8173-disp-ovl", .data = (void *)MTK_DISP_OVL },
> + { .compatible = "mediatek,mt8173-disp-rdma", .data = (void *)MTK_DISP_RDMA },
> + { .compatible = "mediatek,mt8173-disp-wdma", .data = (void *)MTK_DISP_WDMA },
> + { .compatible = "mediatek,mt8173-disp-color", .data = (void *)MTK_DISP_COLOR },
> + { .compatible = "mediatek,mt8173-disp-aal", .data = (void *)MTK_DISP_AAL},
> + { .compatible = "mediatek,mt8173-disp-gamma", .data = (void *)MTK_DISP_GAMMA, },
> + { .compatible = "mediatek,mt8173-disp-ufoe", .data = (void *)MTK_DISP_UFOE },
> + { .compatible = "mediatek,mt8173-dsi", .data = (void *)MTK_DSI },
> + { .compatible = "mediatek,mt8173-dpi", .data = (void *)MTK_DPI },
> + { .compatible = "mediatek,mt8173-disp-mutex", .data = (void *)MTK_DISP_MUTEX },
> + { .compatible = "mediatek,mt8173-disp-od", .data = (void *)MTK_DISP_OD },
> + { }
> +};
> +
> +static int mtk_drm_probe(struct platform_device *pdev)
> +{
> + struct device *dev = &pdev->dev;
> + struct mtk_drm_private *private;
> + struct resource *mem;
> + struct device_node *node;
> + struct component_match *match = NULL;
> + int ret;
> + int num_larbs = 0;
> +
> + private = devm_kzalloc(dev, sizeof(*private), GFP_KERNEL);
> + if (!private)
> + return -ENOMEM;
> +
> + mutex_init(&private->commit.lock);
> + INIT_WORK(&private->commit.work, mtk_atomic_work);
> +
> + mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> + private->config_regs = devm_ioremap_resource(dev, mem);
> + if (IS_ERR(private->config_regs)) {
> + ret = PTR_ERR(private->config_regs);
> + dev_err(dev, "Failed to ioremap mmsys-config resource: %d\n",
> + ret);
> + return ret;
> + }
> +
> + /* Iterate over sibling DISP function blocks */
> + for_each_child_of_node(dev->of_node->parent, node) {
> + const struct of_device_id *of_id;
> + enum mtk_ddp_comp_type comp_type;
> + int comp_id;
> +
> + of_id = of_match_node(mtk_ddp_comp_dt_ids, node);
> + if (!of_id)
> + continue;
> +
> + comp_type = (enum mtk_ddp_comp_type)of_id->data;
> +
> + if (comp_type == MTK_DISP_MUTEX) {
> + private->mutex_node = of_node_get(node);
> + continue;
> + }
I'd move the MUTEX check after "is_available()", to catch the odd case
where the MUTEX node is disabled (it will still be NULL, and fail
below).
> +
> + if (!of_device_is_available(node)) {
> + dev_dbg(dev, "Skipping disabled component %s\n",
> + node->full_name);
> + continue;
> + }
> +
> + comp_id = mtk_ddp_comp_get_id(node, comp_type);
> + if (comp_id < 0) {
> + dev_info(dev, "Skipping unknown component %s\n",
> + node->full_name);
dev_warn()
> + continue;
> + }
> +
> + /*
> + * Currently only the OVL, DSI, and DPI blocks have separate
> + * component platform drivers.
> + */
> + if (comp_type == MTK_DISP_OVL ||
> + comp_type == MTK_DSI ||
> + comp_type == MTK_DPI) {
> + dev_info(dev, "Adding component match for %s\n",
> + node->full_name);
> + component_match_add(dev, &match, compare_of, node);
> + }
> +
> + private->comp_node[comp_id] = of_node_get(node);
> +
> + if (comp_type == MTK_DISP_OVL) {
> + struct device_node *larb_node;
> +
> + larb_node = of_parse_phandle(node, "mediatek,larb", 0);
> + if (larb_node && num_larbs < MAX_CRTC)
> + private->larb_node[num_larbs++] = larb_node;
It feels like the larb_nodes should be handled directly by the ovl driver.
> + }
> + }
> +
> + if (!private->mutex_node) {
> + dev_err(dev, "Failed to find disp-mutex node\n");
Cleanup:
of_node_put() any nodes already in comp_node[]
Anything to clean after component_match_add()?
of_node_put() larb_nodes?
> + return -ENODEV;
> + }
> +
> + pm_runtime_enable(dev);
> +
> + platform_set_drvdata(pdev, private);
> +
> + return component_master_add_with_match(dev, &mtk_drm_ops, match);
> +}
> +
> +static int mtk_drm_remove(struct platform_device *pdev)
> +{
> + component_master_del(&pdev->dev, &mtk_drm_ops);
> + pm_runtime_disable(&pdev->dev);
Cleanup:
of_node_put() any nodes already in comp_node[]
Anything to clean after component_match_add()?
of_node_put() larb_nodes?
> +
> + return 0;
> +}
> +
> +#ifdef CONFIG_PM_SLEEP
> +static int mtk_drm_sys_suspend(struct device *dev)
> +{
> + struct mtk_drm_private *private = dev_get_drvdata(dev);
> + struct drm_device *drm = private->drm;
> + struct drm_connector *conn;
> + int i;
> +
> + drm_kms_helper_poll_disable(drm);
> +
> + drm_modeset_lock_all(drm);
> + list_for_each_entry(conn, &drm->mode_config.connector_list, head) {
> + int old_dpms = conn->dpms;
> +
> + if (conn->funcs->dpms)
> + conn->funcs->dpms(conn, DRM_MODE_DPMS_OFF);
> +
> + /* Set the old mode back to the connector for resume */
> + conn->dpms = old_dpms;
> + }
> + drm_modeset_unlock_all(drm);
> +
> + for (i = 0; i < MAX_CRTC; i++) {
> + if (!private->larb_dev[i])
> + break;
> +
> + mtk_smi_larb_put(private->larb_dev[i]);
> + }
> +
> + DRM_INFO("mtk_drm_sys_suspend\n");
> + return 0;
> +}
> +
> +static int mtk_drm_sys_resume(struct device *dev)
> +{
> + struct mtk_drm_private *private = dev_get_drvdata(dev);
> + struct drm_device *drm = private->drm;
> + struct drm_connector *conn;
> + int ret;
> + int i;
> +
> + for (i = 0; i < MAX_CRTC; i++) {
> + if (!private->larb_dev[i])
> + break;
> +
> + ret = mtk_smi_larb_get(private->larb_dev[i]);
> + if (ret) {
> + DRM_ERROR("mtk_smi_larb_get fail %d\n", ret);
> + return ret;
> + }
> + }
> +
> + drm_modeset_lock_all(drm);
> + list_for_each_entry(conn, &drm->mode_config.connector_list, head) {
> + int desired_mode = conn->dpms;
> +
> + /*
> + * at suspend time, we save dpms to connector->dpms,
> + * restore the old_dpms, and at current time, the connector
> + * dpms status must be DRM_MODE_DPMS_OFF.
> + */
> + conn->dpms = DRM_MODE_DPMS_OFF;
> +
> + /*
> + * If the connector has been disconnected during suspend,
> + * disconnect it from the encoder and leave it off. We'll notify
> + * userspace at the end.
> + */
> + if (conn->funcs->dpms)
> + conn->funcs->dpms(conn, desired_mode);
> + }
> + drm_modeset_unlock_all(drm);
> +
> + drm_kms_helper_poll_enable(drm);
> +
> + DRM_INFO("mtk_drm_sys_resume\n");
> + return 0;
> +}
> +
> +SIMPLE_DEV_PM_OPS(mtk_drm_pm_ops, mtk_drm_sys_suspend, mtk_drm_sys_resume);
> +#endif
> +
> +static const struct of_device_id mtk_drm_of_ids[] = {
> + { .compatible = "mediatek,mt8173-mmsys", },
> + { }
> +};
> +
> +static struct platform_driver mtk_drm_platform_driver = {
> + .probe = mtk_drm_probe,
> + .remove = mtk_drm_remove,
> + .driver = {
> + .name = "mediatek-drm",
> + .of_match_table = mtk_drm_of_ids,
> +#ifdef CONFIG_PM_SLEEP
> + .pm = &mtk_drm_pm_ops,
> +#endif
> + },
> +};
> +
> +static int __init mtk_drm_init(void)
> +{
> + int ret;
> +
> + ret = platform_driver_register(&mtk_drm_platform_driver);
> + if (ret < 0) {
> + pr_err("Failed to register DRM platform driver: %d\n", ret);
> + goto err;
> + }
> +
> + ret = platform_driver_register(&mtk_disp_ovl_driver);
> + if (ret < 0) {
> + pr_err("Failed to register OVL platform driver: %d\n", ret);
> + goto drm_err;
> + }
> +
> + return 0;
> +
> +drm_err:
> + platform_driver_unregister(&mtk_drm_platform_driver);
> +err:
> + return ret;
> +}
> +
> +static void __exit mtk_drm_exit(void)
> +{
> + platform_driver_unregister(&mtk_disp_ovl_driver);
> + platform_driver_unregister(&mtk_drm_platform_driver);
> +}
> +
> +module_init(mtk_drm_init);
> +module_exit(mtk_drm_exit);
> +
> +MODULE_AUTHOR("YT SHEN <yt.shen at mediatek.com>");
> +MODULE_DESCRIPTION("Mediatek SoC DRM driver");
> +MODULE_LICENSE("GPL v2");
> diff --git a/drivers/gpu/drm/mediatek/mtk_drm_drv.h b/drivers/gpu/drm/mediatek/mtk_drm_drv.h
> new file mode 100644
> index 0000000..5e5128e
> --- /dev/null
> +++ b/drivers/gpu/drm/mediatek/mtk_drm_drv.h
> @@ -0,0 +1,61 @@
> +/*
> + * Copyright (c) 2015 MediaTek Inc.
> + *
> + * This program is free software; you can redistribute it and/or modify
> + * it under the terms of the GNU General Public License version 2 as
> + * published by the Free Software Foundation.
> + *
> + * This program is distributed in the hope that it will be useful,
> + * but WITHOUT ANY WARRANTY; without even the implied warranty of
> + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
> + * GNU General Public License for more details.
> + */
> +
> +#ifndef MTK_DRM_DRV_H
> +#define MTK_DRM_DRV_H
> +
> +#include <linux/io.h>
> +#include "mtk_drm_ddp_comp.h"
> +
> +#define MAX_CRTC 2
> +#define MAX_CONNECTOR 2
> +
> +struct device;
> +struct device_node;
> +struct drm_crtc;
> +struct drm_device;
> +struct drm_fb_helper;
> +struct drm_property;
> +struct regmap;
> +
> +struct mtk_drm_private {
> + struct drm_fb_helper *fb_helper;
Not used?
> + struct drm_device *drm;
> +
> + /*
> + * created crtc object would be contained at this array and
> + * this array is used to be aware of which crtc did it request vblank.
I don't understand this comment.
> + */
> + struct drm_crtc *crtc[MAX_CRTC];
> + struct drm_property *plane_zpos_property;
Not used.
> + unsigned int pipe;
what pipe is this?
> +
> + struct device_node *larb_node[MAX_CRTC];
> + struct device *larb_dev[MAX_CRTC];
> + struct device_node *mutex_node;
> + struct device *mutex_dev;
> + void __iomem *config_regs;
> + unsigned int path_len[MAX_CRTC];
> + const enum mtk_ddp_comp_id *path[MAX_CRTC];
Having 5 arrays of length MAX_CRTC suggests you really want one to
combine these fields into a struct, and have an MAX_CRTC array of the
struct.
In fact, this struct sounds like it should be "mtk_crtc", which wraps
a drm_crtc.
> + struct device_node *comp_node[DDP_COMPONENT_ID_MAX];
> +
> + struct {
> + struct drm_atomic_state *state;
> + struct work_struct work;
> + struct mutex lock;
> + } commit;
> +};
> +
> +extern struct platform_driver mtk_disp_ovl_driver;
> +
> +#endif /* MTK_DRM_DRV_H */
> diff --git a/drivers/gpu/drm/mediatek/mtk_drm_fb.c b/drivers/gpu/drm/mediatek/mtk_drm_fb.c
> new file mode 100644
> index 0000000..dfa931b
> --- /dev/null
> +++ b/drivers/gpu/drm/mediatek/mtk_drm_fb.c
> @@ -0,0 +1,151 @@
> +/*
> + * Copyright (c) 2015 MediaTek Inc.
> + *
> + * This program is free software; you can redistribute it and/or modify
> + * it under the terms of the GNU General Public License version 2 as
> + * published by the Free Software Foundation.
> + *
> + * This program is distributed in the hope that it will be useful,
> + * but WITHOUT ANY WARRANTY; without even the implied warranty of
> + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
> + * GNU General Public License for more details.
> + */
> +
> +#include <drm/drmP.h>
> +#include <drm/drm_crtc_helper.h>
> +#include <drm/drm_fb_helper.h>
> +#include <drm/drm_gem.h>
> +
> +#include "mtk_drm_drv.h"
> +#include "mtk_drm_fb.h"
> +#include "mtk_drm_gem.h"
> +
> +/*
> + * mtk specific framebuffer structure.
> + *
> + * @fb: drm framebuffer object.
> + * @gem_obj: array of gem objects.
> + */
> +struct mtk_drm_fb {
> + struct drm_framebuffer base;
> + struct drm_gem_object *gem_obj[MAX_FB_OBJ];
Nit: The display controller driver does not handle multi-buffer formats.
So, maybe just add the array later when it does.
Arguably, for now it is just adding complexity with no benefit.
> +};
> +
> +#define to_mtk_fb(x) container_of(x, struct mtk_drm_fb, base)
> +
> +struct drm_gem_object *mtk_fb_get_gem_obj(struct drm_framebuffer *fb,
> + unsigned int plane)
> +{
> + struct mtk_drm_fb *mtk_fb = to_mtk_fb(fb);
> +
> + if (plane >= MAX_FB_OBJ)
> + return NULL;
> +
> + return mtk_fb->gem_obj[plane];
> +}
> +
> +static int mtk_drm_fb_create_handle(struct drm_framebuffer *fb,
> + struct drm_file *file_priv,
> + unsigned int *handle)
> +{
> + struct mtk_drm_fb *mtk_fb = to_mtk_fb(fb);
> +
> + return drm_gem_handle_create(file_priv, mtk_fb->gem_obj[0], handle);
> +}
> +
> +static void mtk_drm_fb_destroy(struct drm_framebuffer *fb)
> +{
> + unsigned int i;
> + struct mtk_drm_fb *mtk_fb = to_mtk_fb(fb);
> + struct drm_gem_object *gem;
> + int nr = drm_format_num_planes(fb->pixel_format);
> +
> + drm_framebuffer_cleanup(fb);
> +
> + for (i = 0; i < nr; i++) {
> + gem = mtk_fb->gem_obj[i];
> + drm_gem_object_unreference_unlocked(gem);
> + }
> +
> + kfree(mtk_fb);
> +}
> +
> +static const struct drm_framebuffer_funcs mtk_drm_fb_funcs = {
> + .create_handle = mtk_drm_fb_create_handle,
> + .destroy = mtk_drm_fb_destroy,
> +};
> +
> +static struct mtk_drm_fb *mtk_drm_framebuffer_init(struct drm_device *dev,
> + struct drm_mode_fb_cmd2 *mode,
> + struct drm_gem_object **obj)
> +{
> + struct mtk_drm_fb *mtk_fb;
> + unsigned int i;
> + int ret;
> +
> + mtk_fb = kzalloc(sizeof(*mtk_fb), GFP_KERNEL);
> + if (!mtk_fb)
> + return ERR_PTR(-ENOMEM);
> +
> + drm_helper_mode_fill_fb_struct(&mtk_fb->base, mode);
> +
> + for (i = 0; i < drm_format_num_planes(mode->pixel_format); i++)
> + mtk_fb->gem_obj[i] = obj[i];
> +
> + ret = drm_framebuffer_init(dev, &mtk_fb->base, &mtk_drm_fb_funcs);
> + if (ret) {
> + DRM_ERROR("failed to initialize framebuffer\n");
> + kfree(mtk_fb);
> + return ERR_PTR(ret);
> + }
> +
> + return mtk_fb;
> +}
> +
> +struct drm_framebuffer *mtk_drm_mode_fb_create(struct drm_device *dev,
> + struct drm_file *file,
> + struct drm_mode_fb_cmd2 *cmd)
> +{
> + unsigned int hsub, vsub, i;
> + struct mtk_drm_fb *mtk_fb;
> + struct drm_gem_object *gem[MAX_FB_OBJ];
> + int err;
> +
> + hsub = drm_format_horz_chroma_subsampling(cmd->pixel_format);
> + vsub = drm_format_vert_chroma_subsampling(cmd->pixel_format);
nit: blank line here would help readability.
> + for (i = 0; i < drm_format_num_planes(cmd->pixel_format); i++) {
> + unsigned int width = cmd->width / (i ? hsub : 1);
> + unsigned int height = cmd->height / (i ? vsub : 1);
> + unsigned int size, bpp;
> +
> + gem[i] = drm_gem_object_lookup(dev, file, cmd->handles[i]);
> + if (!gem[i]) {
> + err = -ENOENT;
> + goto unreference;
> + }
> +
> + bpp = drm_format_plane_cpp(cmd->pixel_format, i);
> + size = (height - 1) * cmd->pitches[i] + width * bpp;
> + size += cmd->offsets[i];
> +
> + if (gem[i]->size < size) {
> + drm_gem_object_unreference_unlocked(gem[i]);
> + err = -EINVAL;
> + goto unreference;
> + }
> + }
> +
> + mtk_fb = mtk_drm_framebuffer_init(dev, cmd, gem);
> + if (IS_ERR(mtk_fb)) {
> + err = PTR_ERR(mtk_fb);
> + goto unreference;
> + }
> +
> + return &mtk_fb->base;
> +
> +unreference:
> + while (i--)
> + drm_gem_object_unreference_unlocked(gem[i]);
> +
> + return ERR_PTR(err);
> +}
> diff --git a/drivers/gpu/drm/mediatek/mtk_drm_fb.h b/drivers/gpu/drm/mediatek/mtk_drm_fb.h
> new file mode 100644
> index 0000000..9ce7307
> --- /dev/null
> +++ b/drivers/gpu/drm/mediatek/mtk_drm_fb.h
> @@ -0,0 +1,29 @@
> +/*
> + * Copyright (c) 2015 MediaTek Inc.
> + *
> + * This program is free software; you can redistribute it and/or modify
> + * it under the terms of the GNU General Public License version 2 as
> + * published by the Free Software Foundation.
> + *
> + * This program is distributed in the hope that it will be useful,
> + * but WITHOUT ANY WARRANTY; without even the implied warranty of
> + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
> + * GNU General Public License for more details.
> + */
> +
> +#ifndef MTK_DRM_FB_H
> +#define MTK_DRM_FB_H
> +
> +#define MAX_FB_OBJ 3
> +
> +struct drm_gem_object *mtk_fb_get_gem_obj(struct drm_framebuffer *fb,
> + unsigned int plane);
> +struct drm_framebuffer *mtk_drm_mode_fb_create(struct drm_device *dev,
> + struct drm_file *file,
> + struct drm_mode_fb_cmd2 *cmd);
> +
> +void mtk_drm_mode_output_poll_changed(struct drm_device *dev);
> +int mtk_fbdev_create(struct drm_device *dev);
> +void mtk_fbdev_destroy(struct drm_device *dev);
> +
> +#endif /* MTK_DRM_FB_H */
> diff --git a/drivers/gpu/drm/mediatek/mtk_drm_gem.c b/drivers/gpu/drm/mediatek/mtk_drm_gem.c
> new file mode 100644
> index 0000000..34fb94c
> --- /dev/null
> +++ b/drivers/gpu/drm/mediatek/mtk_drm_gem.c
> @@ -0,0 +1,189 @@
> +/*
> + * Copyright (c) 2015 MediaTek Inc.
> + *
> + * This program is free software; you can redistribute it and/or modify
> + * it under the terms of the GNU General Public License version 2 as
> + * published by the Free Software Foundation.
> + *
> + * This program is distributed in the hope that it will be useful,
> + * but WITHOUT ANY WARRANTY; without even the implied warranty of
> + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
> + * GNU General Public License for more details.
> + */
> +
> +#include <drm/drmP.h>
> +#include <drm/drm_gem.h>
> +
> +#include "mtk_drm_gem.h"
> +
> +struct mtk_drm_gem_obj *mtk_drm_gem_init(struct drm_device *dev,
> + unsigned long size)
static?
But actually, just folding this directly into mtk_drm_gem_create()
would make the code flow clearer, since this function has no
corresponding _fini().
> +{
> + struct mtk_drm_gem_obj *mtk_gem_obj;
> + int ret;
> +
> + size = round_up(size, PAGE_SIZE);
> +
> + mtk_gem_obj = kzalloc(sizeof(*mtk_gem_obj), GFP_KERNEL);
> + if (!mtk_gem_obj)
> + return ERR_PTR(-ENOMEM);
> +
> + ret = drm_gem_object_init(dev, &mtk_gem_obj->base, size);
> + if (ret < 0) {
> + DRM_ERROR("failed to initialize gem object\n");
> + kfree(mtk_gem_obj);
> + return ERR_PTR(ret);
> + }
> +
> + return mtk_gem_obj;
> +}
> +
> +struct mtk_drm_gem_obj *mtk_drm_gem_create(struct drm_device *dev,
> + unsigned long size, bool alloc_kmap)
static?
> +{
> + struct mtk_drm_gem_obj *mtk_gem;
> + struct drm_gem_object *obj;
> + int ret;
> +
> + mtk_gem = mtk_drm_gem_init(dev, size);
> + if (IS_ERR(mtk_gem))
> + return ERR_CAST(mtk_gem);
> +
> + obj = &mtk_gem->base;
> +
> + init_dma_attrs(&mtk_gem->dma_attrs);
> + dma_set_attr(DMA_ATTR_WRITE_COMBINE, &mtk_gem->dma_attrs);
> +
> + if (!alloc_kmap)
> + dma_set_attr(DMA_ATTR_NO_KERNEL_MAPPING, &mtk_gem->dma_attrs);
> +
> + mtk_gem->cookie = dma_alloc_attrs(dev->dev, obj->size,
> + (dma_addr_t *)&mtk_gem->dma_addr, GFP_KERNEL,
> + &mtk_gem->dma_attrs);
> + if (!mtk_gem->cookie) {
> + DRM_ERROR("failed to allocate %zx byte dma buffer", obj->size);
> + ret = -ENOMEM;
> + goto err_gem_free;
> + }
> +
> + if (alloc_kmap)
> + mtk_gem->kvaddr = mtk_gem->cookie;
> +
> + DRM_INFO("cookie = %p dma_addr = %llx\n",
> + mtk_gem->cookie, mtk_gem->dma_addr);
> +
> + return mtk_gem;
> +
> +err_gem_free:
> + drm_gem_object_release(obj);
> + kfree(mtk_gem);
> + return ERR_PTR(ret);
> +}
> +
> +void mtk_drm_gem_free_object(struct drm_gem_object *obj)
> +{
> + struct mtk_drm_gem_obj *mtk_gem = to_mtk_gem_obj(obj);
> +
> + drm_gem_free_mmap_offset(obj);
> +
> + /* release file pointer to gem object. */
> + drm_gem_object_release(obj);
drm_gem_object_release calls drm_gem_free_mmap_offset().
> +
> + dma_free_attrs(obj->dev->dev, obj->size, mtk_gem->cookie,
> + mtk_gem->dma_addr, &mtk_gem->dma_attrs);
I think you want to do this before calling drm_gem_object_release.
> +
> + kfree(mtk_gem);
> +}
> +
> +int mtk_drm_gem_dumb_create(struct drm_file *file_priv, struct drm_device *dev,
> + struct drm_mode_create_dumb *args)
> +{
> + struct mtk_drm_gem_obj *mtk_gem;
> + int ret;
> +
> + args->pitch = args->width * DIV_ROUND_UP(args->bpp, 8);
> + args->size = args->pitch * args->height;
> +
> + mtk_gem = mtk_drm_gem_create(dev, args->size, false);
> + if (IS_ERR(mtk_gem))
> + return PTR_ERR(mtk_gem);
> +
> + /*
> + * allocate a id of idr table where the obj is registered
> + * and handle has the id what user can see.
> + */
> + ret = drm_gem_handle_create(file_priv, &mtk_gem->base, &args->handle);
> + if (ret)
> + goto err_handle_create;
> +
> + /* drop reference from allocate - handle holds it now. */
> + drm_gem_object_unreference_unlocked(&mtk_gem->base);
> +
> + return 0;
> +
> +err_handle_create:
> + mtk_drm_gem_free_object(&mtk_gem->base);
> + return ret;
> +}
> +
> +int mtk_drm_gem_dumb_map_offset(struct drm_file *file_priv,
> + struct drm_device *dev, uint32_t handle,
> + uint64_t *offset)
> +{
> + struct drm_gem_object *obj;
> + int ret;
> +
> + obj = drm_gem_object_lookup(dev, file_priv, handle);
> + if (!obj) {
> + DRM_ERROR("failed to lookup gem object.\n");
> + return -EINVAL;
> + }
> +
> + ret = drm_gem_create_mmap_offset(obj);
> + if (ret)
> + goto out;
> +
> + *offset = drm_vma_node_offset_addr(&obj->vma_node);
> + DRM_DEBUG_KMS("offset = 0x%llx\n", *offset);
> +
> +out:
> + drm_gem_object_unreference_unlocked(obj);
> + return ret;
> +}
> +
> +static int mtk_drm_gem_object_mmap(struct drm_gem_object *obj,
> + struct vm_area_struct *vma)
> +
> +{
> + int ret;
> + struct mtk_drm_gem_obj *mtk_gem = to_mtk_gem_obj(obj);
> + struct drm_device *drm = obj->dev;
> +
> + /*
> + * dma_alloc_attrs() allocated a struct page table for rk_obj, so clear
> + * VM_PFNMAP flag that was set by drm_gem_mmap_obj()/drm_gem_mmap().
> + */
> + vma->vm_flags &= ~VM_PFNMAP;
> + vma->vm_pgoff = 0;
> +
> + ret = dma_mmap_attrs(drm->dev, vma, mtk_gem->cookie, mtk_gem->dma_addr,
> + obj->size, &mtk_gem->dma_attrs);
> + if (ret)
> + drm_gem_vm_close(vma);
> +
> + return ret;
> +}
> +
> +int mtk_drm_gem_mmap(struct file *filp, struct vm_area_struct *vma)
> +{
> + struct drm_gem_object *obj;
> + int ret;
> +
> + ret = drm_gem_mmap(filp, vma);
> + if (ret)
> + return ret;
> +
> + obj = vma->vm_private_data;
> +
> + return mtk_drm_gem_object_mmap(obj, vma);
> +}
> diff --git a/drivers/gpu/drm/mediatek/mtk_drm_gem.h b/drivers/gpu/drm/mediatek/mtk_drm_gem.h
> new file mode 100644
> index 0000000..fb7953e
> --- /dev/null
> +++ b/drivers/gpu/drm/mediatek/mtk_drm_gem.h
> @@ -0,0 +1,56 @@
> +/*
> + * Copyright (c) 2015 MediaTek Inc.
> + *
> + * This program is free software; you can redistribute it and/or modify
> + * it under the terms of the GNU General Public License version 2 as
> + * published by the Free Software Foundation.
> + *
> + * This program is distributed in the hope that it will be useful,
> + * but WITHOUT ANY WARRANTY; without even the implied warranty of
> + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
> + * GNU General Public License for more details.
> + */
> +
> +#ifndef _MTK_DRM_GEM_H_
> +#define _MTK_DRM_GEM_H_
> +
> +#include <drm/drm_gem.h>
> +
> +/*
> + * mtk drm buffer structure.
> + *
> + * @base: a gem object.
> + * - a new handle to this gem object would be created
> + * by drm_gem_handle_create().
> + * @cookie: the return value of dma_alloc_attrs(), keep it for dma_free_attrs()
> + * @kvaddr: kernel virtual address of gem buffer.
> + * @dma_addr: dma address of gem buffer.
> + * @dma_attrs: dma attributes of gem buffer.
> + *
> + * P.S. this object would be transferred to user as kms_bo.handle so
> + * user can access the buffer through kms_bo.handle.
> + */
> +struct mtk_drm_gem_obj {
> + struct drm_gem_object base;
> + void __iomem *cookie;
> + void __iomem *kvaddr;
Is kvaddr really __iomem?
> + dma_addr_t dma_addr;
> + struct dma_attrs dma_attrs;
> +};
> +
> +#define to_mtk_gem_obj(x) container_of(x, struct mtk_drm_gem_obj, base)
> +
> +struct mtk_drm_gem_obj *mtk_drm_gem_init(struct drm_device *dev,
> + unsigned long size);
> +void mtk_drm_gem_free_object(struct drm_gem_object *gem);
> +struct mtk_drm_gem_obj *mtk_drm_gem_create(struct drm_device *dev,
> + unsigned long size, bool alloc_kmap);
> +int mtk_drm_gem_dumb_create(struct drm_file *file_priv,
> + struct drm_device *dev, struct drm_mode_create_dumb *args);
> +int mtk_drm_gem_dumb_map_offset(struct drm_file *file_priv,
> + struct drm_device *dev, uint32_t handle, uint64_t *offset);
> +int mtk_drm_gem_mmap(struct file *filp, struct vm_area_struct *vma);
> +int mtk_drm_gem_mmap_buf(struct drm_gem_object *obj,
> + struct vm_area_struct *vma);
> +
> +#endif
> diff --git a/drivers/gpu/drm/mediatek/mtk_drm_plane.c b/drivers/gpu/drm/mediatek/mtk_drm_plane.c
> new file mode 100644
> index 0000000..3a8843c
> --- /dev/null
> +++ b/drivers/gpu/drm/mediatek/mtk_drm_plane.c
> @@ -0,0 +1,167 @@
> +/*
> + * Copyright (c) 2015 MediaTek Inc.
> + * Author: CK Hu <ck.hu at mediatek.com>
> + *
> + * This program is free software; you can redistribute it and/or modify
> + * it under the terms of the GNU General Public License version 2 as
> + * published by the Free Software Foundation.
> + *
> + * This program is distributed in the hope that it will be useful,
> + * but WITHOUT ANY WARRANTY; without even the implied warranty of
> + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
> + * GNU General Public License for more details.
> + */
> +
> +#include <drm/drmP.h>
> +#include <drm/drm_atomic.h>
> +#include <drm/drm_atomic_helper.h>
> +#include <drm/drm_plane_helper.h>
> +#include <linux/dma-buf.h>
> +#include <linux/reservation.h>
> +
> +#include "mtk_drm_crtc.h"
> +#include "mtk_drm_ddp_comp.h"
> +#include "mtk_drm_drv.h"
> +#include "mtk_drm_fb.h"
> +#include "mtk_drm_gem.h"
> +#include "mtk_drm_plane.h"
> +
> +static const uint32_t formats[] = {
> + DRM_FORMAT_XRGB8888,
> + DRM_FORMAT_ARGB8888,
> + DRM_FORMAT_RGB565,
> +};
> +
> +static const struct drm_plane_funcs mtk_plane_funcs = {
> + .update_plane = drm_atomic_helper_update_plane,
> + .disable_plane = drm_atomic_helper_disable_plane,
> + .destroy = drm_plane_cleanup,
> + .reset = drm_atomic_helper_plane_reset,
> + .atomic_duplicate_state = drm_atomic_helper_plane_duplicate_state,
> + .atomic_destroy_state = drm_atomic_helper_plane_destroy_state,
> +};
> +
> +static int mtk_plane_atomic_check(struct drm_plane *plane,
> + struct drm_plane_state *state)
> +{
> + struct drm_framebuffer *fb = state->fb;
> + struct drm_crtc_state *crtc_state;
> + bool visible;
> + int ret;
> + struct drm_rect dest = {
> + .x1 = state->crtc_x,
> + .y1 = state->crtc_y,
> + .x2 = state->crtc_x + state->crtc_w,
> + .y2 = state->crtc_y + state->crtc_h,
> + };
> + struct drm_rect src = {
> + /* 16.16 fixed point */
> + .x1 = state->src_x,
> + .y1 = state->src_y,
> + .x2 = state->src_x + state->src_w,
> + .y2 = state->src_y + state->src_h,
> + };
> + struct drm_rect clip = { 0, };
> +
> + if (!fb)
> + return 0;
> +
> + if (!mtk_fb_get_gem_obj(fb, 0)) {
> + DRM_DEBUG_KMS("buffer is null\n");
> + return -EFAULT;
> + }
> +
> + if (!state->crtc)
> + return 0;
> +
> + crtc_state = drm_atomic_get_crtc_state(state->state, state->crtc);
> + if (IS_ERR(crtc_state))
> + return PTR_ERR(crtc_state);
> +
> + clip.x2 = crtc_state->mode.hdisplay;
> + clip.y2 = crtc_state->mode.vdisplay;
> +
> + ret = drm_plane_helper_check_update(plane, state->crtc, fb,
> + &src, &dest, &clip,
> + DRM_PLANE_HELPER_NO_SCALING,
> + DRM_PLANE_HELPER_NO_SCALING,
> + true, true, &visible);
> + if (ret)
> + return ret;
> +
> + return 0;
> +}
> +
> +static void mtk_plane_atomic_update(struct drm_plane *plane,
> + struct drm_plane_state *old_state)
> +{
> + struct drm_plane_state *state = plane->state;
> + struct drm_gem_object *gem_obj;
> + struct drm_crtc *crtc = state->crtc;
> + struct mtk_drm_plane *mtk_plane = to_mtk_plane(plane);
> + struct drm_rect dest = {
> + .x1 = state->crtc_x,
> + .y1 = state->crtc_y,
> + .x2 = state->crtc_x + state->crtc_w,
> + .y2 = state->crtc_y + state->crtc_h,
> + };
> + struct drm_rect clip = { 0, };
> +
> + if (!crtc)
> + return;
> +
> + clip.x2 = state->crtc->state->mode.hdisplay;
> + clip.y2 = state->crtc->state->mode.vdisplay;
> + drm_rect_intersect(&dest, &clip);
> + mtk_plane->disp_size = (dest.y2 - dest.y1) << 16 | (dest.x2 - dest.x1);
> +
> + plane->fb = state->fb;
This doesn't look right. The drm core should be doing this for us.
Why do you need this here?
I really think we want to be using a "struct mtk_plane_state" which
wraps a drm_plane_state and accumulates our ovl specific changes.
During init, when creating crtcs & planes, we should tell each plane
its id, and which ovl it should use.
The mtk_plane code can then provide a function for the vblank irq to
apply mtk_plane's pending state.
> +
> + gem_obj = mtk_fb_get_gem_obj(state->fb, 0);
> + mtk_plane->flip_obj = to_mtk_gem_obj(gem_obj);
We do not need to store "flip_obj".
We only use it twice, +3 and +5 lines down from here.
Also, this doesn't look safe. What if state->fb is NULL?
It works because to_mtk_gem_obj(NULL) == NULL, but it relies on an
internal implementation detail - gem_obj.base is at offset 0.
> + mtk_plane->crtc = crtc;
This isn't used, either.
> +
> + if (mtk_plane->flip_obj)
> + mtk_drm_crtc_plane_config(crtc, mtk_plane->idx, true,
> + mtk_plane->flip_obj->dma_addr);
> +}
> +
> +static void mtk_plane_atomic_disable(struct drm_plane *plane,
> + struct drm_plane_state *old_state)
> +{
> + struct mtk_drm_plane *mtk_plane = to_mtk_plane(plane);
> + struct drm_crtc *crtc = old_state->crtc;
> +
> + if (!crtc)
> + return;
> +
> + mtk_drm_crtc_plane_config(crtc, mtk_plane->idx, false, 0);
> +
> + mtk_drm_crtc_commit(crtc);
Why this here? Won't this happen during mtk_drm_crtc_atomic_flush?
> +}
> +
> +static const struct drm_plane_helper_funcs mtk_plane_helper_funcs = {
> + .atomic_check = mtk_plane_atomic_check,
> + .atomic_update = mtk_plane_atomic_update,
> + .atomic_disable = mtk_plane_atomic_disable,
> +};
> +
> +int mtk_plane_init(struct drm_device *dev, struct mtk_drm_plane *mtk_plane,
> + unsigned long possible_crtcs, enum drm_plane_type type,
> + unsigned int zpos, unsigned int max_plane)
max_plane is not used.
Ok... enough for today :-).
Thanks!
-Dan
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