[PATCH 02/10] drm/mediatek: Implement Display Stream Compression support
AngeloGioacchino Del Regno
angelogioacchino.delregno at collabora.com
Wed Jul 1 05:19:42 PDT 2026
Add a real driver for the Display Stream Compression (DSC) Display
Controller IP, implementing support for DSC v1.1 to v1.2.
In order to do this, it was necessary to remove the basic DSC IP
bypass setup from mtk_ddp_comp: this functionality is retained in
the new mtk_disp_dsc driver, which checks if DSC was actually
requested by other components (with the only one that currently
supports this being DSI) and, if not, it will set BYPASS mode in
the DSC IP.
Like before, the BYPASS mode is set before starting the DSC IP,
but unlike before, this is being done in the component start
callback instead of the config one.
Notably, the config callback is called by mtk_crtc always
immediately before the calling start callback, so the order of
register writes is retained.
The only real difference is that now this is being done through
CPU writes instead of CMDQ, but since that's called only once
and since it's just three registers, the performance impact will
not be minimal and not even measurable.
As anticipated, DSC handling was also introduced in the mtk_dsi
driver: when performing dsi_host_attach, the driver now checks
if the DSI panel adds the DSC configuration structure to the
mipi_dsi_device structure and, if it does, it will store a
pointer in the driver-local mtk_dsi structure's `dsc` member.
The DSI driver will then check whether the DSC configuration
that comes from the panel is valid (in regard to MediaTek DSI)
and will call the DRM API's DSC helpers to calculate and set
all of the const and RC parameters for the actual DSC setup.
For the time being, even though the latest MediaTek SoCs do
support DSC v1.2, only DSC v1.1 pre-scr support is implemented
as an initial contribution (which is rather big, and 1.2 would
make it even bigger - but that can anyway be implemented later).
As a last step for validation of DSC parameters in DSI, a check
for the hdisplay against DSC slice sidth and one for vdisplay
against DSC slice height was added to the mode_valid callback,
making sure that H/V are, as expected, multiples of slice W/H.
Signed-off-by: AngeloGioacchino Del Regno <angelogioacchino.delregno at collabora.com>
---
drivers/gpu/drm/mediatek/Makefile | 1 +
drivers/gpu/drm/mediatek/mtk_crtc.c | 21 ++
drivers/gpu/drm/mediatek/mtk_ddp_comp.c | 43 +--
drivers/gpu/drm/mediatek/mtk_ddp_comp.h | 9 +
drivers/gpu/drm/mediatek/mtk_disp_drv.h | 9 +
drivers/gpu/drm/mediatek/mtk_disp_dsc.c | 435 ++++++++++++++++++++++++
drivers/gpu/drm/mediatek/mtk_drm_drv.c | 2 +
drivers/gpu/drm/mediatek/mtk_drm_drv.h | 1 +
drivers/gpu/drm/mediatek/mtk_dsi.c | 110 +++++-
9 files changed, 581 insertions(+), 50 deletions(-)
create mode 100644 drivers/gpu/drm/mediatek/mtk_disp_dsc.c
diff --git a/drivers/gpu/drm/mediatek/Makefile b/drivers/gpu/drm/mediatek/Makefile
index 952d294642fb..03b3470ea5b5 100644
--- a/drivers/gpu/drm/mediatek/Makefile
+++ b/drivers/gpu/drm/mediatek/Makefile
@@ -5,6 +5,7 @@ mediatek-drm-y := mtk_crtc.o \
mtk_disp_aal.o \
mtk_disp_ccorr.o \
mtk_disp_color.o \
+ mtk_disp_dsc.o \
mtk_disp_gamma.o \
mtk_disp_merge.o \
mtk_disp_ovl.o \
diff --git a/drivers/gpu/drm/mediatek/mtk_crtc.c b/drivers/gpu/drm/mediatek/mtk_crtc.c
index caa02a708d0a..f39f197057a7 100644
--- a/drivers/gpu/drm/mediatek/mtk_crtc.c
+++ b/drivers/gpu/drm/mediatek/mtk_crtc.c
@@ -22,6 +22,7 @@
#include "mtk_crtc.h"
#include "mtk_ddp_comp.h"
+#include "mtk_disp_drv.h"
#include "mtk_drm_drv.h"
#include "mtk_plane.h"
@@ -343,6 +344,8 @@ static int mtk_crtc_ddp_hw_init(struct mtk_crtc *mtk_crtc)
struct drm_connector *connector;
struct drm_encoder *encoder;
struct drm_connector_list_iter conn_iter;
+ struct mtk_ddp_comp *comp_dsi = NULL, *comp_dsc = NULL;
+ struct drm_dsc_config *dsc_cfg;
struct drm_device *dev = mtk_crtc->base.dev;
unsigned int width, height, vrefresh, bpc = MTK_MAX_BPC;
int ret;
@@ -397,6 +400,17 @@ static int mtk_crtc_ddp_hw_init(struct mtk_crtc *mtk_crtc)
if (!mtk_ddp_comp_add(mtk_crtc->ddp_comp[i], mtk_crtc->mutex))
mtk_mutex_add_comp(mtk_crtc->mutex,
mtk_crtc->ddp_comp[i]->id);
+
+ /* For now, only single DSI is supported */
+ if (mtk_crtc->ddp_comp[i]->id >= DDP_COMPONENT_DSI0 &&
+ mtk_crtc->ddp_comp[i]->id <= DDP_COMPONENT_DSI3)
+ if (!comp_dsi)
+ comp_dsi = mtk_crtc->ddp_comp[i];
+
+ if (mtk_crtc->ddp_comp[i]->id == DDP_COMPONENT_DSC0 ||
+ mtk_crtc->ddp_comp[i]->id == DDP_COMPONENT_DSC1)
+ if (!comp_dsc)
+ comp_dsc = mtk_crtc->ddp_comp[i];
}
if (!mtk_ddp_comp_add(mtk_crtc->ddp_comp[i], mtk_crtc->mutex))
mtk_mutex_add_comp(mtk_crtc->mutex, mtk_crtc->ddp_comp[i]->id);
@@ -412,6 +426,13 @@ static int mtk_crtc_ddp_hw_init(struct mtk_crtc *mtk_crtc)
mtk_ddp_comp_start(comp);
}
+ /* Setup the DSC if present, with the config coming from DSI */
+ if (comp_dsc && comp_dsi) {
+ dsc_cfg = mtk_dsi_get_dsc_config(comp_dsi->dev);
+ if (dsc_cfg)
+ mtk_ddp_comp_dsc_setup(comp_dsc, dsc_cfg);
+ }
+
/* Initially configure all planes */
for (i = 0; i < mtk_crtc->layer_nr; i++) {
struct drm_plane *plane = &mtk_crtc->planes[i];
diff --git a/drivers/gpu/drm/mediatek/mtk_ddp_comp.c b/drivers/gpu/drm/mediatek/mtk_ddp_comp.c
index 9672ea1f91a2..13aaf12ecbe5 100644
--- a/drivers/gpu/drm/mediatek/mtk_ddp_comp.c
+++ b/drivers/gpu/drm/mediatek/mtk_ddp_comp.c
@@ -40,12 +40,6 @@
#define DITHER_LSB_ERR_SHIFT_G(x) (((x) & 0x7) << 12)
#define DITHER_ADD_LSHIFT_G(x) (((x) & 0x7) << 4)
-#define DISP_REG_DSC_CON 0x0000
-#define DSC_EN BIT(0)
-#define DSC_DUAL_INOUT BIT(2)
-#define DSC_BYPASS BIT(4)
-#define DSC_UFOE_SEL BIT(16)
-
#define DISP_REG_OD_EN 0x0000
#define DISP_REG_OD_CFG 0x0020
#define OD_RELAYMODE BIT(0)
@@ -187,36 +181,6 @@ static void mtk_dither_set(struct device *dev, unsigned int bpc,
DISP_DITHERING, cmdq_pkt);
}
-static void mtk_dsc_config(struct device *dev, unsigned int w,
- unsigned int h, unsigned int vrefresh,
- unsigned int bpc, struct cmdq_pkt *cmdq_pkt)
-{
- struct mtk_ddp_comp_dev *priv = dev_get_drvdata(dev);
-
- /* dsc bypass mode */
- mtk_ddp_write_mask(cmdq_pkt, DSC_BYPASS, &priv->cmdq_reg, priv->regs,
- DISP_REG_DSC_CON, DSC_BYPASS);
- mtk_ddp_write_mask(cmdq_pkt, DSC_UFOE_SEL, &priv->cmdq_reg, priv->regs,
- DISP_REG_DSC_CON, DSC_UFOE_SEL);
- mtk_ddp_write_mask(cmdq_pkt, DSC_DUAL_INOUT, &priv->cmdq_reg, priv->regs,
- DISP_REG_DSC_CON, DSC_DUAL_INOUT);
-}
-
-static void mtk_dsc_start(struct device *dev)
-{
- struct mtk_ddp_comp_dev *priv = dev_get_drvdata(dev);
-
- /* write with mask to reserve the value set in mtk_dsc_config */
- mtk_ddp_write_mask(NULL, DSC_EN, &priv->cmdq_reg, priv->regs, DISP_REG_DSC_CON, DSC_EN);
-}
-
-static void mtk_dsc_stop(struct device *dev)
-{
- struct mtk_ddp_comp_dev *priv = dev_get_drvdata(dev);
-
- writel_relaxed(0x0, priv->regs + DISP_REG_DSC_CON);
-}
-
static void mtk_od_config(struct device *dev, unsigned int w,
unsigned int h, unsigned int vrefresh,
unsigned int bpc, struct cmdq_pkt *cmdq_pkt)
@@ -309,9 +273,9 @@ static const struct mtk_ddp_comp_funcs ddp_dpi = {
};
static const struct mtk_ddp_comp_funcs ddp_dsc = {
- .clk_enable = mtk_ddp_clk_enable,
- .clk_disable = mtk_ddp_clk_disable,
- .config = mtk_dsc_config,
+ .clk_enable = mtk_dsc_clk_enable,
+ .clk_disable = mtk_dsc_clk_disable,
+ .dsc_setup = mtk_dsc_setup,
.start = mtk_dsc_start,
.stop = mtk_dsc_stop,
};
@@ -671,6 +635,7 @@ int mtk_ddp_comp_init(struct device *dev, struct device_node *node, struct mtk_d
type == MTK_DISP_BLS ||
type == MTK_DISP_CCORR ||
type == MTK_DISP_COLOR ||
+ type == MTK_DISP_DSC ||
type == MTK_DISP_GAMMA ||
type == MTK_DISP_MERGE ||
type == MTK_DISP_OVL ||
diff --git a/drivers/gpu/drm/mediatek/mtk_ddp_comp.h b/drivers/gpu/drm/mediatek/mtk_ddp_comp.h
index 3f3d43f4330d..99bf1e1015da 100644
--- a/drivers/gpu/drm/mediatek/mtk_ddp_comp.h
+++ b/drivers/gpu/drm/mediatek/mtk_ddp_comp.h
@@ -20,6 +20,7 @@ struct drm_crtc;
struct drm_device;
struct mtk_plane_state;
struct drm_crtc_state;
+struct drm_dsc_config;
enum mtk_ddp_comp_type {
MTK_DISP_AAL,
@@ -56,6 +57,7 @@ struct mtk_ddp_comp_funcs {
void (*config)(struct device *dev, unsigned int w,
unsigned int h, unsigned int vrefresh,
unsigned int bpc, struct cmdq_pkt *cmdq_pkt);
+ void (*dsc_setup)(struct device *dev, struct drm_dsc_config *dsc);
void (*start)(struct device *dev);
void (*stop)(struct device *dev);
void (*register_vblank_cb)(struct device *dev,
@@ -149,6 +151,13 @@ static inline void mtk_ddp_comp_config(struct mtk_ddp_comp *comp,
comp->funcs->config(comp->dev, w, h, vrefresh, bpc, cmdq_pkt);
}
+static inline void mtk_ddp_comp_dsc_setup(struct mtk_ddp_comp *comp,
+ struct drm_dsc_config *dsc)
+{
+ if (comp->funcs && comp->funcs->dsc_setup)
+ comp->funcs->dsc_setup(comp->dev, dsc);
+}
+
static inline void mtk_ddp_comp_start(struct mtk_ddp_comp *comp)
{
if (comp->funcs && comp->funcs->start)
diff --git a/drivers/gpu/drm/mediatek/mtk_disp_drv.h b/drivers/gpu/drm/mediatek/mtk_disp_drv.h
index 679d413bf10b..5e2d8748120a 100644
--- a/drivers/gpu/drm/mediatek/mtk_disp_drv.h
+++ b/drivers/gpu/drm/mediatek/mtk_disp_drv.h
@@ -12,6 +12,8 @@
#include "mtk_mdp_rdma.h"
#include "mtk_plane.h"
+struct drm_dsc_config;
+
int mtk_aal_clk_enable(struct device *dev);
void mtk_aal_clk_disable(struct device *dev);
void mtk_aal_config(struct device *dev, unsigned int w,
@@ -47,9 +49,16 @@ void mtk_dpi_start(struct device *dev);
void mtk_dpi_stop(struct device *dev);
unsigned int mtk_dpi_encoder_index(struct device *dev);
+int mtk_dsc_clk_enable(struct device *dev);
+void mtk_dsc_clk_disable(struct device *dev);
+void mtk_dsc_setup(struct device *dev, struct drm_dsc_config *dsc_cfg);
+void mtk_dsc_start(struct device *dev);
+void mtk_dsc_stop(struct device *dev);
+
void mtk_dsi_ddp_start(struct device *dev);
void mtk_dsi_ddp_stop(struct device *dev);
unsigned int mtk_dsi_encoder_index(struct device *dev);
+struct drm_dsc_config *mtk_dsi_get_dsc_config(struct device *dev);
int mtk_gamma_clk_enable(struct device *dev);
void mtk_gamma_clk_disable(struct device *dev);
diff --git a/drivers/gpu/drm/mediatek/mtk_disp_dsc.c b/drivers/gpu/drm/mediatek/mtk_disp_dsc.c
new file mode 100644
index 000000000000..79b66bd7e5f3
--- /dev/null
+++ b/drivers/gpu/drm/mediatek/mtk_disp_dsc.c
@@ -0,0 +1,435 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright (c) 2021 MediaTek Inc.
+ * Copyright (c) 2025 Collabora Ltd
+ * AngeloGioacchino Del Regno <angelogioacchino.delregno at collabora.com>
+ */
+
+#include <linux/clk.h>
+#include <linux/component.h>
+#include <linux/module.h>
+#include <linux/of_device.h>
+#include <linux/platform_device.h>
+#include <linux/pm_runtime.h>
+#include <linux/soc/mediatek/mtk-cmdq.h>
+
+#include <drm/display/drm_dsc.h>
+#include <drm/display/drm_dsc_helper.h>
+
+#include "mtk_crtc.h"
+#include "mtk_ddp_comp.h"
+#include "mtk_disp_drv.h"
+
+#define DISP_REG_DSC_CON 0x0
+# define DSC_EN BIT(0)
+# define DSC_DUAL_INOUT BIT(2)
+# define DSC_IN_SRC_SEL BIT(3)
+# define DSC_BYPASS BIT(4)
+# define DSC_RELAY BIT(5)
+# define DSC_V1_1_EXT BIT(6)
+# define DSC_PT_MEM_EN BIT(7)
+# define DSC_SW_RESET BIT(8)
+# define DSC_EMPTY_FLAG_SEL GENMASK(15, 14)
+ # define DSC_EMPTY_FLAG_NORMAL_DET 0
+ # define DSC_EMPTY_FLAG_ALWAYS_HIGH 1
+ # define DSC_EMPTY_FLAG_ALWAYS_LOW 2
+ # define DSC_EMPTY_FLAG_DO_NOT_SEND 3
+# define DSC_UFOE_SEL BIT(16)
+# define DSC_OUTPUT_SWAP BIT(18)
+# define DSC_ZERO_FIFO_STALL_DISABLE BIT(20)
+
+#define DISP_REG_DSC_SPR 0x14
+#define DISP_REG_DSC_PIC_W 0x18
+# define DSC_PIC_WIDTH GENMASK(15, 0)
+# define DSC_PIC_GROUP_WIDTH_M1 GENMASK(31, 16)
+
+#define DISP_REG_DSC_PIC_H 0x1c
+# define DSC_PIC_HEIGHT GENMASK(15, 0)
+# define DSC_PIC_HEIGHT_EXT_M1 GENMASK(31, 16)
+
+#define DISP_REG_DSC_SLICE_W 0x20
+# define DSC_SLICE_WIDTH GENMASK(15, 0)
+# define DSC_SLICE_GROUP_WIDTH_M1 GENMASK(31, 16)
+
+#define DISP_REG_DSC_SLICE_H 0x24
+# define DSC_SLICE_HEIGHT_M1 GENMASK(15, 0)
+# define DSC_SLICE_NUM_M1 GENMASK(29, 16)
+# define DSC_SLICE_WIDTH_MOD3 GENMASK(31, 30)
+
+#define DISP_REG_DSC_CHUNK_SIZE 0x28
+
+#define DISP_REG_DSC_BUF_SIZE 0x2c
+# define DISP_DSC_BUF_SIZE_MASK GENMASK(23, 0)
+
+#define DISP_REG_DSC_MODE 0x30
+# define DSC_RGB_SWAP BIT(2)
+# define DSC_INIT_DELAY_HEIGHT GENMASK(11, 8)
+
+#define DISP_REG_DSC_CFG 0x34
+# define DSC_CFG_FLATNESS_DET_THRES GENMASK(4, 0)
+# define DSC_CFG_FLATNESS_8BITS 2
+# define DSC_CFG_FLATNESS_10BITS 8
+# define DSC_CFG_ICH_EN BIT(5)
+# define DSC_CFG_ICH_LINE_CLEAR GENMASK(7, 6)
+# define DSC_CFG_V1P1 BIT(8)
+# define DSC_CFG_IDLE_MODE BIT(9)
+# define DSC_CFG_CRC_EN BIT(12)
+# define DSC_CFG_DSC12_BUGFIX BIT(14)
+# define DSC_CFG_CORE_CHECKSUM BIT(15)
+
+#define DISP_REG_DSC_PAD 0x38
+# define DSC_PAD_NUMBER GENMASK(2, 0)
+
+#define DISP_REG_DSC_ENC_WIDTH 0x3c
+# define DSC_ENC_WIDTH_SLICE GENMASK(15, 0)
+# define DSC_ENC_WIDTH_PIC GENMASK(31, 16)
+
+#define DISP_REG_DSC_PIC_PRE_PAD_SIZE 0x40
+# define DSC_PIC_PREPAD_HEIGHT GENMASK(15, 0)
+# define DSC_PIC_PREPAD_WIDTH GENMASK(31, 16)
+
+#define DISP_REG_DSC_DBG_CON 0x60
+# define DSC_CKSM_CAL_EN BIT(9)
+
+#define DISP_REG_DSC_OUTBUF 0x70
+# define DSC_OBUF_SIZE GENMASK(11, 0)
+
+#define DISP_REG_DSC_PPS(x) (0x80 + (x * 4)) /* 0..19 */
+# define DSC_P0_UP_LINE_BUF_DEPTH GENMASK(3, 0)
+# define DSC_P0_BPC GENMASK(7, 4)
+# define DSC_P0_BPP GENMASK(17, 8)
+# define DSC_P0_RCT_ON BIT(18)
+# define DSC_P0_BLOCK_PRED_EN BIT(19)
+# define DSC_P1_INITIAL_XMIT_DELAY GENMASK(15, 0)
+# define DSC_P1_INITIAL_DEC_DELAY GENMASK(31, 16)
+# define DSC_P2_INITIAL_SCALE_VALUE GENMASK(15, 0)
+# define DSC_P2_SCALE_INCR_INTERVAL GENMASK(31, 16)
+# define DSC_P3_SCALE_DECR_INTERVAL GENMASK(15, 0)
+# define DSC_P3_FIRST_LINE_BPG_OFFSET GENMASK(31, 16)
+# define DSC_P4_NFL_BPG_OFFSET GENMASK(15, 0)
+# define DSC_P4_SLICE_BPG_OFFSET GENMASK(31, 16)
+# define DSC_P5_INITIAL_OFFSET GENMASK(15, 0)
+# define DSC_P5_FINAL_OFFSET GENMASK(31, 16)
+# define DSC_P6_FLATNESS_MIN_QP GENMASK(4, 0)
+# define DSC_P6_FLATNESS_MAX_QP GENMASK(12, 8)
+# define DSC_P6_RC_MODEL_SIZE GENMASK(31, 16)
+# define DSC_P7_RC_EDGE_FACTOR GENMASK(7, 0)
+# define DSC_P7_RC_QUANT_INCR_LIMIT0 GENMASK(12, 8)
+# define DSC_P7_RC_QUANT_INCR_LIMIT1 GENMASK(20, 16)
+# define DSC_P7_RC_TGT_OFFSET_HI GENMASK(27, 24)
+# define DSC_P7_RC_TGT_OFFSET_LO GENMASK(31, 28)
+# define DSC_P12_RC_RANGE_MIN_QP GENMASK(4, 0)
+# define DSC_P12_RC_RANGE_MAX_QP GENMASK(9, 5)
+# define DSC_P12_RC_RANGE_BPG_OFFSET GENMASK(15, 10)
+
+#define DISP_REG_DSC_SHADOW 0x200
+# define DSC_FORCE_COMMIT BIT(0)
+# define DSC_BYPASS_SHADOW BIT(1)
+# define DSC_READ_WORKING BIT(2)
+# define DSC_SHADOW_DSC_VERSION_MINOR GENMASK(8, 5)
+
+struct mtk_dsc {
+ struct clk *clk;
+ void __iomem *reg;
+ struct cmdq_client_reg cmdq_reg;
+ bool dsc_config_done;
+};
+
+int mtk_dsc_clk_enable(struct device *dev)
+{
+ struct mtk_dsc *disp_dsc = dev_get_drvdata(dev);
+
+ return clk_prepare_enable(disp_dsc->clk);
+}
+
+void mtk_dsc_clk_disable(struct device *dev)
+{
+ struct mtk_dsc *disp_dsc = dev_get_drvdata(dev);
+
+ clk_disable_unprepare(disp_dsc->clk);
+}
+
+static void mtk_dsc_pps_setup(struct mtk_dsc *disp_dsc, struct drm_dsc_config *dsc_cfg)
+{
+ u32 data;
+ int i, j;
+
+ /* PPS 0 - Note: Fractional BPP not supported, check handled in mtk_dsi! */
+ data = FIELD_PREP(DSC_P0_UP_LINE_BUF_DEPTH, dsc_cfg->line_buf_depth);
+ data |= FIELD_PREP(DSC_P0_BPC, dsc_cfg->bits_per_component);
+ data |= FIELD_PREP(DSC_P0_BPP, dsc_cfg->bits_per_pixel);
+ data |= DSC_P0_RCT_ON | DSC_P0_BLOCK_PRED_EN;
+ writel(data, disp_dsc->reg + DISP_REG_DSC_PPS(0));
+
+ /* PPS 1 */
+ data = FIELD_PREP(DSC_P1_INITIAL_XMIT_DELAY, dsc_cfg->initial_xmit_delay);
+ data |= FIELD_PREP(DSC_P1_INITIAL_DEC_DELAY, dsc_cfg->initial_dec_delay);
+ writel(data, disp_dsc->reg + DISP_REG_DSC_PPS(1));
+
+ /* PPS 2 */
+ data = FIELD_PREP(DSC_P2_INITIAL_SCALE_VALUE, dsc_cfg->initial_scale_value);
+ data |= FIELD_PREP(DSC_P2_SCALE_INCR_INTERVAL, dsc_cfg->scale_increment_interval);
+ writel(data, disp_dsc->reg + DISP_REG_DSC_PPS(2));
+
+ /* PPS 3 */
+ data = FIELD_PREP(DSC_P3_SCALE_DECR_INTERVAL, dsc_cfg->scale_decrement_interval);
+ data |= FIELD_PREP(DSC_P3_FIRST_LINE_BPG_OFFSET, dsc_cfg->first_line_bpg_offset);
+ writel(data, disp_dsc->reg + DISP_REG_DSC_PPS(3));
+
+ /* PPS 4 */
+ data = FIELD_PREP(DSC_P4_NFL_BPG_OFFSET, dsc_cfg->nfl_bpg_offset);
+ data |= FIELD_PREP(DSC_P4_SLICE_BPG_OFFSET, dsc_cfg->slice_bpg_offset);
+ writel(data, disp_dsc->reg + DISP_REG_DSC_PPS(4));
+
+ /* PPS 5 */
+ data = FIELD_PREP(DSC_P5_INITIAL_OFFSET, dsc_cfg->initial_offset);
+ data |= FIELD_PREP(DSC_P5_FINAL_OFFSET, dsc_cfg->final_offset);
+ writel(data, disp_dsc->reg + DISP_REG_DSC_PPS(5));
+
+ /* PPS 6 */
+ data = FIELD_PREP(DSC_P6_FLATNESS_MIN_QP, dsc_cfg->flatness_min_qp);
+ data |= FIELD_PREP(DSC_P6_FLATNESS_MAX_QP, dsc_cfg->flatness_max_qp);
+ writel(data, disp_dsc->reg + DISP_REG_DSC_PPS(6));
+
+ /* PPS 7 */
+ data = FIELD_PREP(DSC_P7_RC_EDGE_FACTOR, dsc_cfg->rc_edge_factor);
+ data |= FIELD_PREP(DSC_P7_RC_QUANT_INCR_LIMIT0, dsc_cfg->rc_quant_incr_limit0);
+ data |= FIELD_PREP(DSC_P7_RC_QUANT_INCR_LIMIT1, dsc_cfg->rc_quant_incr_limit1);
+ data |= FIELD_PREP(DSC_P7_RC_TGT_OFFSET_HI, dsc_cfg->rc_tgt_offset_high);
+ data |= FIELD_PREP(DSC_P7_RC_TGT_OFFSET_LO, dsc_cfg->rc_tgt_offset_low);
+ writel(data, disp_dsc->reg + DISP_REG_DSC_PPS(7));
+
+ /* PPS 8..11 - Each register holds 4 RC buffer thresholds (PPS 11 has two) */
+ for (i = 0; i < 4; i++) {
+ u8 block_num = i * 4;
+ data = 0;
+
+ for (j = 0; j < 4; j++) {
+ u8 buf_index = block_num + j;
+ u8 data_shift = j * 8;
+
+ /* rc_buf_thresh holds 14 elements in total */
+ if (buf_index > 13)
+ break;
+
+ data |= dsc_cfg->rc_buf_thresh[buf_index] << data_shift;
+ }
+ writel(data, disp_dsc->reg + DISP_REG_DSC_PPS(8 + i));
+ }
+
+ /* PPS 12..19 - Each register holds two sets of RC range parameters (19 has one) */
+ for (i = 0; i < 7; i++) {
+ struct drm_dsc_rc_range_parameters *rcrp = dsc_cfg->rc_range_params;
+ u8 block_num = i * 2;
+ data = 0;
+
+ for (j = 0; j < 2; j++) {
+ u8 buf_index = block_num + j;
+ u8 data_shift = j * 16;
+ u16 range_data;
+
+ range_data = FIELD_PREP(DSC_P12_RC_RANGE_MIN_QP,
+ rcrp[buf_index].range_min_qp);
+ range_data |= FIELD_PREP(DSC_P12_RC_RANGE_MAX_QP,
+ rcrp[buf_index].range_max_qp);
+ range_data |= FIELD_PREP(DSC_P12_RC_RANGE_BPG_OFFSET,
+ rcrp[buf_index].range_bpg_offset);
+
+ range_data <<= data_shift;
+ data |= range_data;
+
+ /* rc_range_params holds 15 elements in total */
+ if (buf_index == 14)
+ break;
+ }
+ writel(data, disp_dsc->reg + DISP_REG_DSC_PPS(12 + i));
+ }
+}
+
+void mtk_dsc_setup(struct device *dev, struct drm_dsc_config *dsc_cfg)
+{
+ struct mtk_dsc *disp_dsc = dev_get_drvdata(dev);
+ u32 dsc_slice_w, dsc_slice_h, dsc_mode, dsc_cfg_rval, dsc_shadow;
+ u32 dsc_dbg_con, dsc_con, dsc_enc_width, dsc_pic_w, dsc_pic_h;
+ u16 pic_group_width, pic_height_ext_num, slice_group_width;
+ u16 chunk_size, dsc_pad_num, dsc_pre_pad_sz;
+
+ pic_height_ext_num = dsc_cfg->pic_height + dsc_cfg->slice_height - 1;
+ pic_group_width = dsc_cfg->slice_width * 4;
+ pic_group_width /= 3;
+
+ slice_group_width = dsc_cfg->slice_width + 2;
+ slice_group_width /= 3;
+
+ if (dsc_cfg->slice_chunk_size)
+ chunk_size = dsc_cfg->slice_chunk_size;
+ else
+ chunk_size = dsc_cfg->slice_width * dsc_cfg->bits_per_pixel / 8 / 16;
+
+ dsc_enc_width = FIELD_PREP(DSC_ENC_WIDTH_PIC, dsc_cfg->pic_width) |
+ FIELD_PREP(DSC_ENC_WIDTH_SLICE, dsc_cfg->slice_width);
+
+ dsc_pic_w = FIELD_PREP(DSC_PIC_GROUP_WIDTH_M1, pic_group_width - 1);
+ dsc_pic_w |= FIELD_PREP(DSC_PIC_WIDTH, dsc_cfg->pic_width);
+ dsc_pic_h = FIELD_PREP(DSC_PIC_HEIGHT_EXT_M1, pic_height_ext_num - 1);
+ dsc_pic_h |= FIELD_PREP(DSC_PIC_HEIGHT, dsc_cfg->pic_height - 1);
+
+ dsc_slice_w = FIELD_PREP(DSC_SLICE_GROUP_WIDTH_M1, slice_group_width - 1);
+ dsc_slice_w |= FIELD_PREP(DSC_SLICE_WIDTH, dsc_cfg->slice_width);
+ dsc_slice_h = FIELD_PREP(DSC_SLICE_WIDTH_MOD3, dsc_cfg->slice_width % 3);
+ dsc_slice_h |= FIELD_PREP(DSC_SLICE_NUM_M1,
+ (pic_height_ext_num / dsc_cfg->slice_height) - 1);
+ dsc_slice_h |= FIELD_PREP(DSC_SLICE_HEIGHT_M1, dsc_cfg->slice_height - 1);
+
+ dsc_pad_num = 3 - ((chunk_size * 2) % 3) % 3;
+ dsc_pad_num = FIELD_PREP(DSC_PAD_NUMBER, dsc_pad_num);
+
+ dsc_pre_pad_sz = FIELD_PREP(DSC_PIC_PREPAD_HEIGHT, dsc_cfg->pic_height);
+ dsc_pre_pad_sz |= FIELD_PREP(DSC_PIC_PREPAD_WIDTH, dsc_cfg->pic_width);
+
+ dsc_mode = FIELD_PREP(DSC_INIT_DELAY_HEIGHT, 4);
+ dsc_mode |= FIELD_PREP(DSC_RGB_SWAP, 0);
+
+ /* Must enable checksum calc in DBG if enabling core checksum in CFG */
+ dsc_cfg_rval = DSC_CFG_ICH_EN | DSC_CFG_CRC_EN | DSC_CFG_DSC12_BUGFIX |
+ DSC_CFG_CORE_CHECKSUM;
+ dsc_dbg_con = DSC_CKSM_CAL_EN;
+
+ if (dsc_cfg->bits_per_component == 8)
+ dsc_cfg_rval |= FIELD_PREP_CONST(DSC_CFG_FLATNESS_DET_THRES,
+ DSC_CFG_FLATNESS_8BITS);
+ else
+ dsc_cfg_rval |= FIELD_PREP_CONST(DSC_CFG_FLATNESS_DET_THRES,
+ DSC_CFG_FLATNESS_10BITS);
+
+ dsc_shadow = FIELD_PREP(DSC_SHADOW_DSC_VERSION_MINOR,
+ dsc_cfg->dsc_version_minor);
+ dsc_shadow |= DSC_FORCE_COMMIT | DSC_BYPASS_SHADOW;
+
+ writel(0, disp_dsc->reg + DISP_REG_DSC_SPR);
+ writel(dsc_enc_width, disp_dsc->reg + DISP_REG_DSC_ENC_WIDTH);
+ writel(dsc_pic_w, disp_dsc->reg + DISP_REG_DSC_PIC_W);
+ writel(dsc_pic_h, disp_dsc->reg + DISP_REG_DSC_PIC_H);
+ writel(dsc_slice_w, disp_dsc->reg + DISP_REG_DSC_SLICE_W);
+ writel(dsc_slice_h, disp_dsc->reg + DISP_REG_DSC_SLICE_H);
+ writel(((chunk_size * 4) / 3) << 16 | chunk_size,
+ disp_dsc->reg + DISP_REG_DSC_CHUNK_SIZE);
+ writel(dsc_pre_pad_sz, disp_dsc->reg + DISP_REG_DSC_PIC_PRE_PAD_SIZE);
+ writel(dsc_pad_num, disp_dsc->reg + DISP_REG_DSC_PAD);
+ writel(FIELD_PREP(DISP_DSC_BUF_SIZE_MASK, chunk_size * dsc_cfg->slice_height),
+ disp_dsc->reg + DISP_REG_DSC_BUF_SIZE);
+ writel(dsc_mode, disp_dsc->reg + DISP_REG_DSC_MODE);
+ writel(dsc_cfg_rval, disp_dsc->reg + DISP_REG_DSC_CFG);
+ writel(dsc_dbg_con, disp_dsc->reg + DISP_REG_DSC_DBG_CON);
+ writel(FIELD_PREP_CONST(DSC_OBUF_SIZE, 1040), disp_dsc->reg + DISP_REG_DSC_OUTBUF);
+ writel(dsc_shadow, disp_dsc->reg + DISP_REG_DSC_SHADOW);
+
+ dsc_con = FIELD_PREP_CONST(DSC_EMPTY_FLAG_SEL, DSC_EMPTY_FLAG_ALWAYS_LOW);
+ dsc_con |= DSC_V1_1_EXT | DSC_UFOE_SEL | DSC_PT_MEM_EN;
+ dsc_con |= DSC_ZERO_FIFO_STALL_DISABLE;
+
+ writel(dsc_con, disp_dsc->reg + DISP_REG_DSC_CON);
+
+ mtk_dsc_pps_setup(disp_dsc, dsc_cfg);
+
+ disp_dsc->dsc_config_done = true;
+}
+
+void mtk_dsc_start(struct device *dev)
+{
+ struct mtk_dsc *disp_dsc = dev_get_drvdata(dev);
+
+ /* If no DSC or config not done, set bypass mode */
+ if (!disp_dsc->dsc_config_done) {
+ mtk_ddp_write_mask(NULL, DSC_BYPASS, &disp_dsc->cmdq_reg,
+ disp_dsc->reg, DISP_REG_DSC_CON, DSC_BYPASS);
+ mtk_ddp_write_mask(NULL, DSC_UFOE_SEL, &disp_dsc->cmdq_reg,
+ disp_dsc->reg, DISP_REG_DSC_CON, DSC_UFOE_SEL);
+ mtk_ddp_write_mask(NULL, DSC_DUAL_INOUT, &disp_dsc->cmdq_reg,
+ disp_dsc->reg, DISP_REG_DSC_CON, DSC_DUAL_INOUT);
+ }
+
+ mtk_ddp_write_mask(NULL, DSC_EN, &disp_dsc->cmdq_reg,
+ disp_dsc->reg, DISP_REG_DSC_CON, DSC_EN);
+}
+
+void mtk_dsc_stop(struct device *dev)
+{
+ struct mtk_dsc *disp_dsc = dev_get_drvdata(dev);
+
+ writel(0, disp_dsc->reg + DISP_REG_DSC_CON);
+}
+
+static int mtk_dsc_bind(struct device *dev, struct device *master, void *data)
+{
+ return 0;
+}
+
+static void mtk_dsc_unbind(struct device *dev, struct device *master, void *data)
+{
+}
+
+static const struct component_ops mtk_dsc_component_ops = {
+ .bind = mtk_dsc_bind,
+ .unbind = mtk_dsc_unbind,
+};
+
+static int mtk_dsc_probe(struct platform_device *pdev)
+{
+ struct device *dev = &pdev->dev;
+ struct mtk_dsc *priv;
+ struct resource *res;
+ int ret;
+
+ priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
+ if (!priv)
+ return -ENOMEM;
+
+ priv->clk = devm_clk_get(dev, NULL);
+ if (IS_ERR(priv->clk))
+ return dev_err_probe(dev, PTR_ERR(priv->clk),
+ "failed to get clk\n");
+
+ priv->reg = devm_platform_get_and_ioremap_resource(pdev, 0, &res);
+ if (IS_ERR(priv->reg))
+ return dev_err_probe(dev, PTR_ERR(priv->reg),
+ "failed to do ioremap\n");
+
+#if IS_REACHABLE(CONFIG_MTK_CMDQ)
+ ret = cmdq_dev_get_client_reg(dev, &priv->cmdq_reg, 0);
+ if (ret)
+ return dev_err_probe(dev, ret, "failed to get gce client reg\n");
+#endif
+
+ platform_set_drvdata(pdev, priv);
+
+ ret = devm_pm_runtime_enable(dev);
+ if (ret)
+ return ret;
+
+ ret = component_add(dev, &mtk_dsc_component_ops);
+ if (ret)
+ return dev_err_probe(dev, ret, "failed to add component\n");
+
+ return 0;
+}
+
+static void mtk_dsc_remove(struct platform_device *pdev)
+{
+ component_del(&pdev->dev, &mtk_dsc_component_ops);
+}
+
+static const struct of_device_id mtk_dsc_driver_dt_match[] = {
+ { .compatible = "mediatek,mt8195-disp-dsc" },
+ { /* sentinel */ }
+};
+MODULE_DEVICE_TABLE(of, mtk_dsc_driver_dt_match);
+
+struct platform_driver mtk_disp_dsc_driver = {
+ .probe = mtk_dsc_probe,
+ .remove = mtk_dsc_remove,
+ .driver = {
+ .name = "mediatek-disp-dsc",
+ .of_match_table = mtk_dsc_driver_dt_match,
+ },
+};
diff --git a/drivers/gpu/drm/mediatek/mtk_drm_drv.c b/drivers/gpu/drm/mediatek/mtk_drm_drv.c
index c86a3f54f35b..bd2d17017bd2 100644
--- a/drivers/gpu/drm/mediatek/mtk_drm_drv.c
+++ b/drivers/gpu/drm/mediatek/mtk_drm_drv.c
@@ -1164,6 +1164,7 @@ static int mtk_drm_probe(struct platform_device *pdev)
if (comp_type == MTK_DISP_AAL ||
comp_type == MTK_DISP_CCORR ||
comp_type == MTK_DISP_COLOR ||
+ comp_type == MTK_DISP_DSC ||
comp_type == MTK_DISP_GAMMA ||
comp_type == MTK_DISP_MERGE ||
comp_type == MTK_DISP_OVL ||
@@ -1272,6 +1273,7 @@ static struct platform_driver * const mtk_drm_drivers[] = {
&mtk_disp_aal_driver,
&mtk_disp_ccorr_driver,
&mtk_disp_color_driver,
+ &mtk_disp_dsc_driver,
&mtk_disp_gamma_driver,
&mtk_disp_merge_driver,
&mtk_disp_ovl_adaptor_driver,
diff --git a/drivers/gpu/drm/mediatek/mtk_drm_drv.h b/drivers/gpu/drm/mediatek/mtk_drm_drv.h
index d48da019a4a3..43aac2d956e7 100644
--- a/drivers/gpu/drm/mediatek/mtk_drm_drv.h
+++ b/drivers/gpu/drm/mediatek/mtk_drm_drv.h
@@ -71,6 +71,7 @@ struct mtk_drm_private {
extern struct platform_driver mtk_disp_aal_driver;
extern struct platform_driver mtk_disp_ccorr_driver;
extern struct platform_driver mtk_disp_color_driver;
+extern struct platform_driver mtk_disp_dsc_driver;
extern struct platform_driver mtk_disp_gamma_driver;
extern struct platform_driver mtk_disp_merge_driver;
extern struct platform_driver mtk_disp_ovl_adaptor_driver;
diff --git a/drivers/gpu/drm/mediatek/mtk_dsi.c b/drivers/gpu/drm/mediatek/mtk_dsi.c
index 46cf4b043f12..3fbcb22ee15e 100644
--- a/drivers/gpu/drm/mediatek/mtk_dsi.c
+++ b/drivers/gpu/drm/mediatek/mtk_dsi.c
@@ -18,6 +18,8 @@
#include <video/mipi_display.h>
#include <video/videomode.h>
+#include <drm/display/drm_dsc.h>
+#include <drm/display/drm_dsc_helper.h>
#include <drm/drm_atomic_helper.h>
#include <drm/drm_bridge.h>
#include <drm/drm_bridge_connector.h>
@@ -71,11 +73,12 @@
#define DSI_PSCTRL 0x1c
#define DSI_PS_WC GENMASK(13, 0)
-#define DSI_PS_SEL GENMASK(17, 16)
+#define DSI_PS_SEL GENMASK(19, 16)
#define PACKED_PS_16BIT_RGB565 0
#define PACKED_PS_18BIT_RGB666 1
#define LOOSELY_PS_24BIT_RGB666 2
#define PACKED_PS_24BIT_RGB888 3
+#define COMPRESSED_PS_DSC 5
#define DSI_VSA_NL 0x20
#define DSI_VBP_NL 0x24
@@ -203,6 +206,7 @@ struct mtk_dsi {
struct drm_bridge bridge;
struct drm_bridge *next_bridge;
struct drm_connector *connector;
+ struct drm_dsc_config *dsc;
struct phy *phy;
void __iomem *regs;
@@ -395,7 +399,7 @@ static void mtk_dsi_rxtx_control(struct mtk_dsi *dsi)
static void mtk_dsi_ps_control(struct mtk_dsi *dsi, bool config_vact)
{
- u32 dsi_buf_bpp, ps_val, ps_wc, vact_nl;
+ u32 dsi_buf_bpp, ps_val, ps_wc, size_val, vact_nl;
if (dsi->format == MIPI_DSI_FMT_RGB565)
dsi_buf_bpp = 2;
@@ -403,7 +407,10 @@ static void mtk_dsi_ps_control(struct mtk_dsi *dsi, bool config_vact)
dsi_buf_bpp = 3;
/* Word count */
- ps_wc = FIELD_PREP(DSI_PS_WC, dsi->vm.hactive * dsi_buf_bpp);
+ if (dsi->dsc)
+ ps_wc = FIELD_PREP(DSI_PS_WC, 2 * dsi->dsc->slice_chunk_size);
+ else
+ ps_wc = FIELD_PREP(DSI_PS_WC, dsi->vm.hactive * dsi_buf_bpp);
ps_val = ps_wc;
/* Pixel Stream type */
@@ -411,7 +418,10 @@ static void mtk_dsi_ps_control(struct mtk_dsi *dsi, bool config_vact)
default:
fallthrough;
case MIPI_DSI_FMT_RGB888:
- ps_val |= FIELD_PREP(DSI_PS_SEL, PACKED_PS_24BIT_RGB888);
+ if (dsi->dsc)
+ ps_val |= FIELD_PREP(DSI_PS_SEL, COMPRESSED_PS_DSC);
+ else
+ ps_val |= FIELD_PREP(DSI_PS_SEL, PACKED_PS_24BIT_RGB888);
break;
case MIPI_DSI_FMT_RGB666:
ps_val |= FIELD_PREP(DSI_PS_SEL, LOOSELY_PS_24BIT_RGB666);
@@ -430,6 +440,18 @@ static void mtk_dsi_ps_control(struct mtk_dsi *dsi, bool config_vact)
writel(ps_wc, dsi->regs + DSI_HSTX_CKL_WC);
}
writel(ps_val, dsi->regs + DSI_PSCTRL);
+
+ if (dsi->driver_data->has_size_ctl) {
+ size_val = FIELD_PREP(DSI_HEIGHT, dsi->vm.vactive);
+ if (dsi->dsc)
+ size_val |= FIELD_PREP(DSI_WIDTH,
+ (ps_wc + dsi_buf_bpp - 1) /
+ dsi_buf_bpp);
+ else
+ size_val |= FIELD_PREP(DSI_WIDTH, dsi->vm.hactive);
+
+ writel(size_val, dsi->regs + DSI_SIZE_CON);
+ }
}
static void mtk_dsi_config_vdo_timing_per_frame_lp(struct mtk_dsi *dsi)
@@ -564,7 +586,43 @@ static void mtk_dsi_config_vdo_timing_per_line_lp(struct mtk_dsi *dsi)
writel(horizontal_frontporch_byte, dsi->regs + DSI_HFP_WC);
}
-static void mtk_dsi_config_vdo_timing(struct mtk_dsi *dsi)
+static int mtk_dsi_set_dsc_params(struct mtk_dsi *dsi)
+{
+ struct drm_dsc_config *dsc = dsi->dsc;
+ struct device *dev = dsi->host.dev;
+ int ret;
+
+ if (dsc->bits_per_pixel & GENMASK(7, 0)) {
+ dev_err(dev, "Fractional bits_per_pixel not supported\n");
+ return -EINVAL;
+ }
+
+ if (dsc->bits_per_component != 8) {
+ dev_err(dev, "%u bits per component is not supported\n",
+ dsc->bits_per_component);
+ return -EINVAL;
+ }
+
+ dsc->simple_422 = false;
+ dsc->convert_rgb = true;
+ dsc->vbr_enable = false;
+
+ drm_dsc_set_const_params(dsc);
+ drm_dsc_set_rc_buf_thresh(dsc);
+
+ ret = drm_dsc_setup_rc_params(dsc, DRM_DSC_1_1_PRE_SCR);
+ if (ret) {
+ dev_err(dev, "Cannot find DSC RC params\n");
+ return ret;
+ }
+
+ dsc->initial_scale_value = drm_dsc_initial_scale_value(dsc);
+ dsc->line_buf_depth = dsc->bits_per_component + 1;
+
+ return drm_dsc_compute_rc_parameters(dsc);
+}
+
+static int mtk_dsi_config_vdo_timing(struct mtk_dsi *dsi)
{
struct videomode *vm = &dsi->vm;
@@ -573,17 +631,17 @@ static void mtk_dsi_config_vdo_timing(struct mtk_dsi *dsi)
writel(vm->vfront_porch, dsi->regs + DSI_VFP_NL);
writel(vm->vactive, dsi->regs + DSI_VACT_NL);
- if (dsi->driver_data->has_size_ctl)
- writel(FIELD_PREP(DSI_HEIGHT, vm->vactive) |
- FIELD_PREP(DSI_WIDTH, vm->hactive),
- dsi->regs + DSI_SIZE_CON);
-
if (dsi->driver_data->support_per_frame_lp)
mtk_dsi_config_vdo_timing_per_frame_lp(dsi);
else
mtk_dsi_config_vdo_timing_per_line_lp(dsi);
mtk_dsi_ps_control(dsi, false);
+
+ if (dsi->dsc)
+ return mtk_dsi_set_dsc_params(dsi);
+
+ return 0;
}
static void mtk_dsi_start(struct mtk_dsi *dsi)
@@ -738,12 +796,17 @@ static int mtk_dsi_poweron(struct mtk_dsi *dsi)
mtk_dsi_ps_control(dsi, true);
mtk_dsi_set_vm_cmd(dsi);
- mtk_dsi_config_vdo_timing(dsi);
+ ret = mtk_dsi_config_vdo_timing(dsi);
+ if (ret)
+ goto err_disable_digital_clk;
+
mtk_dsi_set_interrupt_enable(dsi);
mtk_dsi_lane_ready(dsi);
mtk_dsi_clk_hs_mode(dsi, 1);
return 0;
+err_disable_digital_clk:
+ clk_disable_unprepare(dsi->digital_clk);
err_disable_engine_clk:
clk_disable_unprepare(dsi->engine_clk);
err_phy_power_off:
@@ -879,6 +942,21 @@ mtk_dsi_bridge_mode_valid(struct drm_bridge *bridge,
if (mode->clock * bpp / dsi->lanes > 1500000)
return MODE_CLOCK_HIGH;
+ if (dsi->dsc) {
+ if (mode->hdisplay % dsi->dsc->slice_width) {
+ dev_err(dsi->host.dev,
+ "DSC: hdisplay %u is not a multiple of slice width %u\n",
+ dsi->dsc->slice_width, mode->hdisplay);
+ return MODE_H_ILLEGAL;
+ }
+ if (mode->vdisplay % dsi->dsc->slice_height) {
+ dev_err(dsi->host.dev,
+ "DSC: vdisplay %u is not a multiple of slice height %u\n",
+ dsi->dsc->slice_height, mode->vdisplay);
+ return MODE_V_ILLEGAL;
+ }
+ }
+
return MODE_OK;
}
@@ -909,6 +987,13 @@ void mtk_dsi_ddp_stop(struct device *dev)
mtk_dsi_poweroff(dsi);
}
+struct drm_dsc_config *mtk_dsi_get_dsc_config(struct device *dev)
+{
+ struct mtk_dsi *dsi = dev_get_drvdata(dev);
+
+ return dsi->dsc;
+}
+
static int mtk_dsi_encoder_init(struct drm_device *drm, struct mtk_dsi *dsi)
{
int ret;
@@ -1001,6 +1086,9 @@ static int mtk_dsi_host_attach(struct mipi_dsi_host *host,
return PTR_ERR(dsi->next_bridge);
}
+ if (device->dsc)
+ dsi->dsc = device->dsc;
+
drm_bridge_add(&dsi->bridge);
ret = component_add(host->dev, &mtk_dsi_component_ops);
--
2.54.0
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