[PATCH 2/9] drm/aspeed: replace struct drm_simple_display_pipe with regular atomic helpers
Thomas Zimmermann
tzimmermann at suse.de
Mon Jul 6 01:31:46 PDT 2026
Hi,
common points from my arcgpu review applied here as well. See below for
a new other things.
Am 04.07.26 um 20:31 schrieb Ze Huang:
> Replace simple display pipe with explicit plane, CRTC and encoder
> objects. Move callbacks to plane and CRTC helpers, with vblank handling
> through drm_crtc_funcs.
>
> This removes intermediate simple-pipe layer and uses standard atomic
> helper wiring.
>
> Signed-off-by: Ze Huang <ze.huang at oss.qualcomm.com>
> ---
> drivers/gpu/drm/aspeed/aspeed_gfx.h | 5 +-
> drivers/gpu/drm/aspeed/aspeed_gfx_crtc.c | 156 +++++++++++++++++++++++--------
> drivers/gpu/drm/aspeed/aspeed_gfx_drv.c | 3 +-
> 3 files changed, 123 insertions(+), 41 deletions(-)
>
> diff --git a/drivers/gpu/drm/aspeed/aspeed_gfx.h b/drivers/gpu/drm/aspeed/aspeed_gfx.h
> index 4e6a442c3886..a34811564c0d 100644
> --- a/drivers/gpu/drm/aspeed/aspeed_gfx.h
> +++ b/drivers/gpu/drm/aspeed/aspeed_gfx.h
> @@ -2,7 +2,6 @@
> /* Copyright 2018 IBM Corporation */
>
> #include <drm/drm_device.h>
> -#include <drm/drm_simple_kms_helper.h>
>
> struct aspeed_gfx {
> struct drm_device drm;
> @@ -17,7 +16,9 @@ struct aspeed_gfx {
> u32 throd_val;
> u32 scan_line_max;
>
> - struct drm_simple_display_pipe pipe;
> + struct drm_plane plane;
> + struct drm_crtc crtc;
> + struct drm_encoder encoder;
> struct drm_connector connector;
> };
> #define to_aspeed_gfx(x) container_of(x, struct aspeed_gfx, drm)
> diff --git a/drivers/gpu/drm/aspeed/aspeed_gfx_crtc.c b/drivers/gpu/drm/aspeed/aspeed_gfx_crtc.c
> index 7877a57b8e26..3294795c31c4 100644
> --- a/drivers/gpu/drm/aspeed/aspeed_gfx_crtc.c
> +++ b/drivers/gpu/drm/aspeed/aspeed_gfx_crtc.c
> @@ -5,6 +5,8 @@
> #include <linux/reset.h>
> #include <linux/regmap.h>
>
> +#include <drm/drm_atomic.h>
> +#include <drm/drm_atomic_helper.h>
> #include <drm/drm_device.h>
> #include <drm/drm_fb_dma_helper.h>
> #include <drm/drm_fourcc.h>
> @@ -12,20 +14,13 @@
> #include <drm/drm_gem_atomic_helper.h>
> #include <drm/drm_gem_dma_helper.h>
> #include <drm/drm_panel.h>
> -#include <drm/drm_simple_kms_helper.h>
> #include <drm/drm_vblank.h>
>
> #include "aspeed_gfx.h"
>
> -static struct aspeed_gfx *
> -drm_pipe_to_aspeed_gfx(struct drm_simple_display_pipe *pipe)
> -{
> - return container_of(pipe, struct aspeed_gfx, pipe);
> -}
> -
Please create a new helper
struct drm_aspeed_gfx *to_aspeed_gfx(drm_device *drm)
that does the upcast.
> static int aspeed_gfx_set_pixel_fmt(struct aspeed_gfx *priv, u32 *bpp)
> {
> - struct drm_crtc *crtc = &priv->pipe.crtc;
> + struct drm_crtc *crtc = &priv->crtc;
> struct drm_device *drm = crtc->dev;
> const u32 format = crtc->primary->state->fb->format->format;
> u32 ctrl1;
> @@ -79,7 +74,7 @@ static void aspeed_gfx_disable_controller(struct aspeed_gfx *priv)
>
> static void aspeed_gfx_crtc_mode_set_nofb(struct aspeed_gfx *priv)
> {
> - struct drm_display_mode *m = &priv->pipe.crtc.state->adjusted_mode;
> + struct drm_display_mode *m = &priv->crtc.state->adjusted_mode;
> u32 ctrl1, d_offset, t_count, bpp;
> int err;
>
> @@ -139,33 +134,31 @@ static void aspeed_gfx_crtc_mode_set_nofb(struct aspeed_gfx *priv)
> writel(priv->throd_val, priv->base + CRT_THROD);
> }
>
> -static void aspeed_gfx_pipe_enable(struct drm_simple_display_pipe *pipe,
> - struct drm_crtc_state *crtc_state,
> - struct drm_plane_state *plane_state)
> +static void aspeed_gfx_crtc_helper_atomic_enable(struct drm_crtc *crtc,
> + struct drm_atomic_commit *state)
Please see my comment on arcgpu for the new naming of 'state'.
> {
> - struct aspeed_gfx *priv = drm_pipe_to_aspeed_gfx(pipe);
> - struct drm_crtc *crtc = &pipe->crtc;
> + struct aspeed_gfx *priv = container_of(crtc, struct aspeed_gfx, crtc);
Please use your helper to_aspeed_gfx(crtc->dev) to do the upcast.
Here any in other places.
>
> aspeed_gfx_crtc_mode_set_nofb(priv);
> aspeed_gfx_enable_controller(priv);
> drm_crtc_vblank_on(crtc);
> }
>
> -static void aspeed_gfx_pipe_disable(struct drm_simple_display_pipe *pipe)
> +static void aspeed_gfx_crtc_helper_atomic_disable(struct drm_crtc *crtc,
> + struct drm_atomic_commit *state)
> {
> - struct aspeed_gfx *priv = drm_pipe_to_aspeed_gfx(pipe);
> - struct drm_crtc *crtc = &pipe->crtc;
> + struct aspeed_gfx *priv = container_of(crtc, struct aspeed_gfx, crtc);
Another upcast issue
>
> drm_crtc_vblank_off(crtc);
> aspeed_gfx_disable_controller(priv);
> }
>
> -static void aspeed_gfx_pipe_update(struct drm_simple_display_pipe *pipe,
> - struct drm_plane_state *plane_state)
> +static void aspeed_gfx_plane_helper_atomic_update(struct drm_plane *plane,
> + struct drm_atomic_commit *state)
> {
> - struct aspeed_gfx *priv = drm_pipe_to_aspeed_gfx(pipe);
> - struct drm_crtc *crtc = &pipe->crtc;
> - struct drm_framebuffer *fb = pipe->plane.state->fb;
> + struct aspeed_gfx *priv = container_of(plane, struct aspeed_gfx, plane);
to_aspeed_gfx(plane->dev)
> + struct drm_crtc *crtc = &priv->crtc;
> + struct drm_framebuffer *fb = plane->state->fb;
> struct drm_pending_vblank_event *event;
> struct drm_gem_dma_object *gem;
>
> @@ -190,9 +183,9 @@ static void aspeed_gfx_pipe_update(struct drm_simple_display_pipe *pipe,
> writel(gem->dma_addr, priv->base + CRT_ADDR);
> }
>
> -static int aspeed_gfx_enable_vblank(struct drm_simple_display_pipe *pipe)
> +static int aspeed_gfx_crtc_enable_vblank(struct drm_crtc *crtc)
> {
> - struct aspeed_gfx *priv = drm_pipe_to_aspeed_gfx(pipe);
> + struct aspeed_gfx *priv = container_of(crtc, struct aspeed_gfx, crtc);
> u32 reg = readl(priv->base + CRT_CTRL1);
>
> /* Clear pending VBLANK IRQ */
> @@ -204,9 +197,9 @@ static int aspeed_gfx_enable_vblank(struct drm_simple_display_pipe *pipe)
> return 0;
> }
>
> -static void aspeed_gfx_disable_vblank(struct drm_simple_display_pipe *pipe)
> +static void aspeed_gfx_crtc_disable_vblank(struct drm_crtc *crtc)
> {
> - struct aspeed_gfx *priv = drm_pipe_to_aspeed_gfx(pipe);
> + struct aspeed_gfx *priv = container_of(crtc, struct aspeed_gfx, crtc);
> u32 reg = readl(priv->base + CRT_CTRL1);
>
> reg &= ~CRT_CTRL_VERTICAL_INTR_EN;
> @@ -216,12 +209,75 @@ static void aspeed_gfx_disable_vblank(struct drm_simple_display_pipe *pipe)
> writel(reg | CRT_CTRL_VERTICAL_INTR_STS, priv->base + CRT_CTRL1);
> }
>
> -static const struct drm_simple_display_pipe_funcs aspeed_gfx_funcs = {
> - .enable = aspeed_gfx_pipe_enable,
> - .disable = aspeed_gfx_pipe_disable,
> - .update = aspeed_gfx_pipe_update,
> - .enable_vblank = aspeed_gfx_enable_vblank,
> - .disable_vblank = aspeed_gfx_disable_vblank,
> +static int aspeed_gfx_plane_helper_atomic_check(struct drm_plane *plane,
> + struct drm_atomic_commit *state)
> +{
> + struct drm_plane_state *plane_state = drm_atomic_get_new_plane_state(state, plane);
> + struct drm_crtc *crtc = plane_state->crtc;
> + struct drm_crtc_state *crtc_state = NULL;
> + int ret;
> +
> + if (crtc)
> + crtc_state = drm_atomic_get_new_crtc_state(state, crtc);
> +
> + ret = drm_atomic_helper_check_plane_state(plane_state, crtc_state,
> + DRM_PLANE_NO_SCALING,
> + DRM_PLANE_NO_SCALING,
> + false, false);
> + return ret;
> +}
Return directly.
> +
> +static const struct drm_plane_helper_funcs aspeed_gfx_plane_helper_funcs = {
> + .prepare_fb = drm_gem_plane_helper_prepare_fb,
> + .atomic_check = aspeed_gfx_plane_helper_atomic_check,
> + .atomic_update = aspeed_gfx_plane_helper_atomic_update,
> +};
> +
> +static const struct drm_plane_funcs aspeed_gfx_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 aspeed_gfx_crtc_helper_atomic_check(struct drm_crtc *crtc,
> + struct drm_atomic_commit *state)
> +{
> + struct drm_crtc_state *crtc_state = drm_atomic_get_new_crtc_state(state, crtc);
> + int ret;
> +
> + if (!crtc_state->enable)
> + goto out;
> +
> + ret = drm_atomic_helper_check_crtc_primary_plane(crtc_state);
> + if (ret)
> + return ret;
> +
> +out:
> + return drm_atomic_add_affected_planes(state, crtc);
> +}
See arcpgu on a possible style improvement.
Best regards
Thomas
> +
> +static const struct drm_crtc_helper_funcs aspeed_gfx_crtc_helper_funcs = {
> + .atomic_check = aspeed_gfx_crtc_helper_atomic_check,
> + .atomic_enable = aspeed_gfx_crtc_helper_atomic_enable,
> + .atomic_disable = aspeed_gfx_crtc_helper_atomic_disable,
> +};
> +
> +static const struct drm_crtc_funcs aspeed_gfx_crtc_funcs = {
> + .reset = drm_atomic_helper_crtc_reset,
> + .destroy = drm_crtc_cleanup,
> + .set_config = drm_atomic_helper_set_config,
> + .page_flip = drm_atomic_helper_page_flip,
> + .atomic_duplicate_state = drm_atomic_helper_crtc_duplicate_state,
> + .atomic_destroy_state = drm_atomic_helper_crtc_destroy_state,
> + .enable_vblank = aspeed_gfx_crtc_enable_vblank,
> + .disable_vblank = aspeed_gfx_crtc_disable_vblank,
> +};
> +
> +static const struct drm_encoder_funcs aspeed_gfx_encoder_funcs = {
> + .destroy = drm_encoder_cleanup,
> };
>
> static const uint32_t aspeed_gfx_formats[] = {
> @@ -232,10 +288,36 @@ static const uint32_t aspeed_gfx_formats[] = {
> int aspeed_gfx_create_pipe(struct drm_device *drm)
> {
> struct aspeed_gfx *priv = to_aspeed_gfx(drm);
> + struct drm_plane *plane = &priv->plane;
> + struct drm_crtc *crtc = &priv->crtc;
> + struct drm_encoder *encoder = &priv->encoder;
> + int ret;
> +
> + ret = drm_universal_plane_init(drm, plane, 0,
> + &aspeed_gfx_plane_funcs,
> + aspeed_gfx_formats,
> + ARRAY_SIZE(aspeed_gfx_formats),
> + NULL,
> + DRM_PLANE_TYPE_PRIMARY, NULL);
> + if (ret)
> + return ret;
> + drm_plane_helper_add(plane, &aspeed_gfx_plane_helper_funcs);
> +
> + ret = drm_crtc_init_with_planes(drm, crtc, plane, NULL,
> + &aspeed_gfx_crtc_funcs, NULL);
> + if (ret)
> + return ret;
> + drm_crtc_helper_add(crtc, &aspeed_gfx_crtc_helper_funcs);
> +
> + ret = drm_encoder_init(drm, encoder, &aspeed_gfx_encoder_funcs,
> + DRM_MODE_ENCODER_NONE, NULL);
> + if (ret)
> + return ret;
> + encoder->possible_crtcs = drm_crtc_mask(crtc);
> +
> + ret = drm_connector_attach_encoder(&priv->connector, encoder);
> + if (ret)
> + return ret;
>
> - return drm_simple_display_pipe_init(drm, &priv->pipe, &aspeed_gfx_funcs,
> - aspeed_gfx_formats,
> - ARRAY_SIZE(aspeed_gfx_formats),
> - NULL,
> - &priv->connector);
> + return 0;
> }
> diff --git a/drivers/gpu/drm/aspeed/aspeed_gfx_drv.c b/drivers/gpu/drm/aspeed/aspeed_gfx_drv.c
> index 46094cca2974..b2d805f0c16d 100644
> --- a/drivers/gpu/drm/aspeed/aspeed_gfx_drv.c
> +++ b/drivers/gpu/drm/aspeed/aspeed_gfx_drv.c
> @@ -21,7 +21,6 @@
> #include <drm/drm_gem_framebuffer_helper.h>
> #include <drm/drm_module.h>
> #include <drm/drm_probe_helper.h>
> -#include <drm/drm_simple_kms_helper.h>
> #include <drm/drm_vblank.h>
> #include <drm/drm_drv.h>
>
> @@ -130,7 +129,7 @@ static irqreturn_t aspeed_gfx_irq_handler(int irq, void *data)
> reg = readl(priv->base + CRT_CTRL1);
>
> if (reg & CRT_CTRL_VERTICAL_INTR_STS) {
> - drm_crtc_handle_vblank(&priv->pipe.crtc);
> + drm_crtc_handle_vblank(&priv->crtc);
> writel(reg, priv->base + priv->int_clr_reg);
> return IRQ_HANDLED;
> }
>
--
--
Thomas Zimmermann
Graphics Driver Developer
SUSE Software Solutions Germany GmbH
Frankenstr. 146, 90461 Nürnberg, Germany, www.suse.com
GF: Jochen Jaser, Andrew McDonald, Werner Knoblich, (HRB 36809, AG Nürnberg)
More information about the linux-arm-kernel
mailing list