[PATCH v3 0/3] enable widebus feature base on chip hardware revision

[PATCH v3 0/3] enable widebus feature base on chip hardware revision

[Kuogee Hsieh]

split into 3 patches
1) widebus timing engine programming
2) dsc timing engine
3) enable widebus feature base on chip hardware revision


Kuogee Hsieh (3):
  drm/msm/dp:  revise timing engine programming to support widebus
    feature
  drm/msm/dp: revise timing engine programming to support compression
    (DSC)
  drm/msm/dp: enable widebus feature for display port

 drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c        |  14 ++-
 drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.h        |   2 +
 .../gpu/drm/msm/disp/dpu1/dpu_encoder_phys_vid.c   |  14 +++
 drivers/gpu/drm/msm/disp/dpu1/dpu_hw_intf.c        | 107 +++++++++++++++------
 drivers/gpu/drm/msm/disp/dpu1/dpu_hw_intf.h        |   5 +
 drivers/gpu/drm/msm/dp/dp_catalog.c                |  36 ++++++-
 drivers/gpu/drm/msm/dp/dp_catalog.h                |   3 +-
 drivers/gpu/drm/msm/dp/dp_ctrl.c                   |  13 ++-
 drivers/gpu/drm/msm/dp/dp_ctrl.h                   |   1 +
 drivers/gpu/drm/msm/dp/dp_display.c                |  30 ++++++
 drivers/gpu/drm/msm/dp/dp_display.h                |   2 +
 drivers/gpu/drm/msm/dp/dp_panel.c                  |   4 +-
 drivers/gpu/drm/msm/dp/dp_panel.h                  |   2 +-
 drivers/gpu/drm/msm/msm_drv.h                      |   6 ++
 14 files changed, 197 insertions(+), 42 deletions(-)

-- 
The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum,
a Linux Foundation Collaborative Project

[PATCH v3 1/3] drm/msm/dp: revise timing engine programming to support widebus feature

[Kuogee Hsieh]

Widebus feature will transmit two pixel data per pixel clock to interface.
Timing engine provides driving force for this purpose. This patch base
on HPG (Hardware Programming Guide) to revise timing engine register
setting to accommodate both widebus and non widebus application. Also
horizontal width parameters need to be reduced by half since two pixel
data are clocked out per pixel clock when widebus feature enabled.
In addition, revised timing engine function is an generic function and
intend to be shared by all platforms to reduce maintenance efforts.

Changes in v2:
-- remove compression related code from timing
-- remove op_info from  struct msm_drm_private
-- remove unnecessary wide_bus_en variables
-- pass wide_bus_en into timing configuration by struct msm_dp

Changes in v3:
-- split patch into 3 patches

Signed-off-by: Kuogee Hsieh <quic_khsieh@quicinc.com>
---
 drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c        | 10 +++
 drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.h        |  2 +
 .../gpu/drm/msm/disp/dpu1/dpu_encoder_phys_vid.c   | 14 +++
 drivers/gpu/drm/msm/disp/dpu1/dpu_hw_intf.c        | 99 ++++++++++++++--------
 drivers/gpu/drm/msm/disp/dpu1/dpu_hw_intf.h        |  2 +
 5 files changed, 93 insertions(+), 34 deletions(-)

diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c b/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c
index 0d315b4..0c22839 100644
--- a/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c
+++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c
@@ -208,6 +208,8 @@ struct dpu_encoder_virt {
 
 	u32 idle_timeout;
 
+	bool wide_bus_en;
+
 	struct msm_dp *dp;
 };
 
@@ -217,6 +219,14 @@ static u32 dither_matrix[DITHER_MATRIX_SZ] = {
 	15, 7, 13, 5, 3, 11, 1, 9, 12, 4, 14, 6, 0, 8, 2, 10
 };
 
+
+bool dpu_encoder_is_widebus_enabled(struct drm_encoder *drm_enc)
+{
+	struct dpu_encoder_virt *dpu_enc = to_dpu_encoder_virt(drm_enc);
+
+	return dpu_enc->wide_bus_en;
+}
+
 static void _dpu_encoder_setup_dither(struct dpu_hw_pingpong *hw_pp, unsigned bpc)
 {
 	struct dpu_hw_dither_cfg dither_cfg = { 0 };
diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.h b/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.h
index 99a5d73..893d74d 100644
--- a/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.h
+++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.h
@@ -168,4 +168,6 @@ int dpu_encoder_get_linecount(struct drm_encoder *drm_enc);
  */
 int dpu_encoder_get_frame_count(struct drm_encoder *drm_enc);
 
+bool dpu_encoder_is_widebus_enabled(struct drm_encoder *drm_enc);
+
 #endif /* __DPU_ENCODER_H__ */
diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder_phys_vid.c b/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder_phys_vid.c
index 185379b..3d6c914 100644
--- a/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder_phys_vid.c
+++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder_phys_vid.c
@@ -110,6 +110,20 @@ static void drm_mode_to_intf_timing_params(
 		timing->v_back_porch += timing->v_front_porch;
 		timing->v_front_porch = 0;
 	}
+
+	timing->wide_bus_en = dpu_encoder_is_widebus_enabled(phys_enc->parent);
+
+	/*
+	 * for DP, divide the horizonal parameters by 2 when
+	 * widebus is enabled
+	 */
+	if (timing->wide_bus_en) {
+		timing->width = timing->width >> 1;
+		timing->xres = timing->xres >> 1;
+		timing->h_back_porch = timing->h_back_porch >> 1;
+		timing->h_front_porch = timing->h_front_porch >> 1;
+		timing->hsync_pulse_width = timing->hsync_pulse_width >> 1;
+	}
 }
 
 static u32 get_horizontal_total(const struct intf_timing_params *timing)
diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_intf.c b/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_intf.c
index 116e2b5..35d4aaa 100644
--- a/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_intf.c
+++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_intf.c
@@ -33,6 +33,7 @@
 #define INTF_TP_COLOR1                  0x05C
 #define INTF_CONFIG2                    0x060
 #define INTF_DISPLAY_DATA_HCTL          0x064
+#define INTF_ACTIVE_DATA_HCTL           0x068
 #define INTF_FRAME_LINE_COUNT_EN        0x0A8
 #define INTF_FRAME_COUNT                0x0AC
 #define   INTF_LINE_COUNT               0x0B0
@@ -90,68 +91,95 @@ static void dpu_hw_intf_setup_timing_engine(struct dpu_hw_intf *ctx,
 	u32 hsync_period, vsync_period;
 	u32 display_v_start, display_v_end;
 	u32 hsync_start_x, hsync_end_x;
+	u32 hsync_data_start_x, hsync_data_end_x;
 	u32 active_h_start, active_h_end;
 	u32 active_v_start, active_v_end;
 	u32 active_hctl, display_hctl, hsync_ctl;
 	u32 polarity_ctl, den_polarity, hsync_polarity, vsync_polarity;
 	u32 panel_format;
-	u32 intf_cfg, intf_cfg2 = 0, display_data_hctl = 0;
+	u32 intf_cfg, intf_cfg2 = 0;
+	u32 display_data_hctl = 0, active_data_hctl = 0;
+	u32 data_width;
+	bool dp_intf = false;
 
 	/* read interface_cfg */
 	intf_cfg = DPU_REG_READ(c, INTF_CONFIG);
+
+	if (ctx->cap->type == INTF_EDP || ctx->cap->type == INTF_DP)
+		dp_intf = true;
+
 	hsync_period = p->hsync_pulse_width + p->h_back_porch + p->width +
 	p->h_front_porch;
 	vsync_period = p->vsync_pulse_width + p->v_back_porch + p->height +
 	p->v_front_porch;
 
 	display_v_start = ((p->vsync_pulse_width + p->v_back_porch) *
-	hsync_period) + p->hsync_skew;
+			hsync_period) + p->hsync_skew;
 	display_v_end = ((vsync_period - p->v_front_porch) * hsync_period) +
-	p->hsync_skew - 1;
+			p->hsync_skew - 1;
+
+	hsync_ctl = (hsync_period << 16) | p->hsync_pulse_width;
 
 	hsync_start_x = p->h_back_porch + p->hsync_pulse_width;
 	hsync_end_x = hsync_period - p->h_front_porch - 1;
 
-	if (p->width != p->xres) {
-		active_h_start = hsync_start_x;
-		active_h_end = active_h_start + p->xres - 1;
-	} else {
-		active_h_start = 0;
-		active_h_end = 0;
-	}
+	/*
+	 * DATA_HCTL_EN controls data timing which can be different from
+	 * video timing. It is recommended to enable it for all cases, except
+	 * if compression is enabled in 1 pixel per clock mode
+	 */
+	if (p->wide_bus_en)
+		intf_cfg2 |= BIT(4);
 
-	if (p->height != p->yres) {
-		active_v_start = display_v_start;
-		active_v_end = active_v_start + (p->yres * hsync_period) - 1;
-	} else {
-		active_v_start = 0;
-		active_v_end = 0;
-	}
+	if (p->wide_bus_en)
+		intf_cfg2 |= BIT(0);
 
-	if (active_h_end) {
-		active_hctl = (active_h_end << 16) | active_h_start;
-		intf_cfg |= BIT(29);	/* ACTIVE_H_ENABLE */
-	} else {
-		active_hctl = 0;
-	}
+	/*
+	 * If widebus is disabled:
+	 * For uncompressed stream, the data is valid for the entire active
+	 * window period.
+	 * For compressed stream, data is valid for a shorter time period
+	 * inside the active window depending on the compression ratio.
+	 *
+	 * If widebus is enabled:
+	 * For uncompressed stream, data is valid for only half the active
+	 * window, since the data rate is doubled in this mode.
+	 * p->width holds the adjusted width for DP but unadjusted width for DSI
+	 * For compressed stream, data validity window needs to be adjusted for
+	 * compression ratio and then further halved.
+	 */
+	data_width = p->width;
+
+	if (!dp_intf && p->wide_bus_en)
+		data_width = p->width >> 1;
+	else
+		data_width = p->width;
 
-	if (active_v_end)
-		intf_cfg |= BIT(30); /* ACTIVE_V_ENABLE */
+	hsync_data_start_x = hsync_start_x;
+	hsync_data_end_x =  hsync_start_x + data_width - 1;
 
-	hsync_ctl = (hsync_period << 16) | p->hsync_pulse_width;
 	display_hctl = (hsync_end_x << 16) | hsync_start_x;
+	display_data_hctl = (hsync_data_end_x << 16) | hsync_data_start_x;
 
-	if (ctx->cap->type == INTF_EDP || ctx->cap->type == INTF_DP) {
-		active_h_start = hsync_start_x;
-		active_h_end = active_h_start + p->xres - 1;
-		active_v_start = display_v_start;
-		active_v_end = active_v_start + (p->yres * hsync_period) - 1;
-
+	if (dp_intf) {
+		// DP timing adjustment
 		display_v_start += p->hsync_pulse_width + p->h_back_porch;
+		display_v_end   -= p->h_front_porch;
+	}
+
+	active_h_start = hsync_start_x;
+	active_h_end = active_h_start + p->xres - 1;
+
+	active_v_start = display_v_start;
+	active_v_end = active_v_start + (p->yres * hsync_period) - 1;
 
-		active_hctl = (active_h_end << 16) | active_h_start;
+	intf_cfg |= BIT(29);	/* ACTIVE_H_ENABLE */
+	intf_cfg |= BIT(30);	/* ACTIVE_V_ENABLE */
+
+	active_hctl = (active_h_end << 16) | active_h_start;
+
+	if (dp_intf)
 		display_hctl = active_hctl;
-	}
 
 	den_polarity = 0;
 	if (ctx->cap->type == INTF_HDMI) {
@@ -204,6 +232,9 @@ static void dpu_hw_intf_setup_timing_engine(struct dpu_hw_intf *ctx,
 	DPU_REG_WRITE(c, INTF_FRAME_LINE_COUNT_EN, 0x3);
 	DPU_REG_WRITE(c, INTF_CONFIG, intf_cfg);
 	DPU_REG_WRITE(c, INTF_PANEL_FORMAT, panel_format);
+	DPU_REG_WRITE(c, INTF_CONFIG2, intf_cfg2);
+	DPU_REG_WRITE(c, INTF_DISPLAY_DATA_HCTL, display_data_hctl);
+	DPU_REG_WRITE(c, INTF_ACTIVE_DATA_HCTL, active_data_hctl);
 }
 
 static void dpu_hw_intf_enable_timing_engine(
diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_intf.h b/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_intf.h
index 3568be8..e4a518a 100644
--- a/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_intf.h
+++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_intf.h
@@ -30,6 +30,8 @@ struct intf_timing_params {
 	u32 border_clr;
 	u32 underflow_clr;
 	u32 hsync_skew;
+
+	bool wide_bus_en;
 };
 
 struct intf_prog_fetch {
-- 
The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum,
a Linux Foundation Collaborative Project

Re: [PATCH v3 1/3] drm/msm/dp: revise timing engine programming to support widebus feature

[Dmitry Baryshkov]

On 04/02/2022 21:36, Kuogee Hsieh wrote:
> Widebus feature will transmit two pixel data per pixel clock to interface.
> Timing engine provides driving force for this purpose. This patch base
> on HPG (Hardware Programming Guide) to revise timing engine register
> setting to accommodate both widebus and non widebus application. Also
> horizontal width parameters need to be reduced by half since two pixel
> data are clocked out per pixel clock when widebus feature enabled.
> In addition, revised timing engine function is an generic function and
> intend to be shared by all platforms to reduce maintenance efforts.
> 
> Changes in v2:
> -- remove compression related code from timing
> -- remove op_info from  struct msm_drm_private
> -- remove unnecessary wide_bus_en variables
> -- pass wide_bus_en into timing configuration by struct msm_dp
> 
> Changes in v3:
> -- split patch into 3 patches
> 
> Signed-off-by: Kuogee Hsieh <quic_khsieh@quicinc.com>
> ---
>   drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c        | 10 +++
>   drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.h        |  2 +
>   .../gpu/drm/msm/disp/dpu1/dpu_encoder_phys_vid.c   | 14 +++
>   drivers/gpu/drm/msm/disp/dpu1/dpu_hw_intf.c        | 99 ++++++++++++++--------
>   drivers/gpu/drm/msm/disp/dpu1/dpu_hw_intf.h        |  2 +
>   5 files changed, 93 insertions(+), 34 deletions(-)
> 
> diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c b/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c
> index 0d315b4..0c22839 100644
> --- a/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c
> +++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c
> @@ -208,6 +208,8 @@ struct dpu_encoder_virt {
>   
>   	u32 idle_timeout;
>   
> +	bool wide_bus_en;
> +
>   	struct msm_dp *dp;
>   };
>   
> @@ -217,6 +219,14 @@ static u32 dither_matrix[DITHER_MATRIX_SZ] = {
>   	15, 7, 13, 5, 3, 11, 1, 9, 12, 4, 14, 6, 0, 8, 2, 10
>   };
>   
> +
> +bool dpu_encoder_is_widebus_enabled(struct drm_encoder *drm_enc)
> +{
> +	struct dpu_encoder_virt *dpu_enc = to_dpu_encoder_virt(drm_enc);
> +
> +	return dpu_enc->wide_bus_en;
> +}
> +
>   static void _dpu_encoder_setup_dither(struct dpu_hw_pingpong *hw_pp, unsigned bpc)
>   {
>   	struct dpu_hw_dither_cfg dither_cfg = { 0 };
> diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.h b/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.h
> index 99a5d73..893d74d 100644
> --- a/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.h
> +++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.h
> @@ -168,4 +168,6 @@ int dpu_encoder_get_linecount(struct drm_encoder *drm_enc);
>    */
>   int dpu_encoder_get_frame_count(struct drm_encoder *drm_enc);
>   
> +bool dpu_encoder_is_widebus_enabled(struct drm_encoder *drm_enc);
> +
>   #endif /* __DPU_ENCODER_H__ */
> diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder_phys_vid.c b/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder_phys_vid.c
> index 185379b..3d6c914 100644
> --- a/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder_phys_vid.c
> +++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder_phys_vid.c
> @@ -110,6 +110,20 @@ static void drm_mode_to_intf_timing_params(
>   		timing->v_back_porch += timing->v_front_porch;
>   		timing->v_front_porch = 0;
>   	}
> +
> +	timing->wide_bus_en = dpu_encoder_is_widebus_enabled(phys_enc->parent);
> +
> +	/*
> +	 * for DP, divide the horizonal parameters by 2 when
> +	 * widebus is enabled
> +	 */
> +	if (timing->wide_bus_en) {
> +		timing->width = timing->width >> 1;
> +		timing->xres = timing->xres >> 1;
> +		timing->h_back_porch = timing->h_back_porch >> 1;
> +		timing->h_front_porch = timing->h_front_porch >> 1;
> +		timing->hsync_pulse_width = timing->hsync_pulse_width >> 1;
> +	}
>   }
>   
>   static u32 get_horizontal_total(const struct intf_timing_params *timing)
> diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_intf.c b/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_intf.c
> index 116e2b5..35d4aaa 100644
> --- a/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_intf.c
> +++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_intf.c
> @@ -33,6 +33,7 @@
>   #define INTF_TP_COLOR1                  0x05C
>   #define INTF_CONFIG2                    0x060
>   #define INTF_DISPLAY_DATA_HCTL          0x064
> +#define INTF_ACTIVE_DATA_HCTL           0x068
>   #define INTF_FRAME_LINE_COUNT_EN        0x0A8
>   #define INTF_FRAME_COUNT                0x0AC
>   #define   INTF_LINE_COUNT               0x0B0
> @@ -90,68 +91,95 @@ static void dpu_hw_intf_setup_timing_engine(struct dpu_hw_intf *ctx,
>   	u32 hsync_period, vsync_period;
>   	u32 display_v_start, display_v_end;
>   	u32 hsync_start_x, hsync_end_x;
> +	u32 hsync_data_start_x, hsync_data_end_x;
>   	u32 active_h_start, active_h_end;
>   	u32 active_v_start, active_v_end;
>   	u32 active_hctl, display_hctl, hsync_ctl;
>   	u32 polarity_ctl, den_polarity, hsync_polarity, vsync_polarity;
>   	u32 panel_format;
> -	u32 intf_cfg, intf_cfg2 = 0, display_data_hctl = 0;
> +	u32 intf_cfg, intf_cfg2 = 0;
> +	u32 display_data_hctl = 0, active_data_hctl = 0;
> +	u32 data_width;
> +	bool dp_intf = false;
>   
>   	/* read interface_cfg */
>   	intf_cfg = DPU_REG_READ(c, INTF_CONFIG);
> +
> +	if (ctx->cap->type == INTF_EDP || ctx->cap->type == INTF_DP)
> +		dp_intf = true;
> +
>   	hsync_period = p->hsync_pulse_width + p->h_back_porch + p->width +
>   	p->h_front_porch;
>   	vsync_period = p->vsync_pulse_width + p->v_back_porch + p->height +
>   	p->v_front_porch;
>   
>   	display_v_start = ((p->vsync_pulse_width + p->v_back_porch) *
> -	hsync_period) + p->hsync_skew;
> +			hsync_period) + p->hsync_skew;
>   	display_v_end = ((vsync_period - p->v_front_porch) * hsync_period) +
> -	p->hsync_skew - 1;
> +			p->hsync_skew - 1;

Whitespace changes. Still in place. Move them to the separate commit please.

> +
> +	hsync_ctl = (hsync_period << 16) | p->hsync_pulse_width;
>   
>   	hsync_start_x = p->h_back_porch + p->hsync_pulse_width;
>   	hsync_end_x = hsync_period - p->h_front_porch - 1;
>   
> -	if (p->width != p->xres) {
> -		active_h_start = hsync_start_x;
> -		active_h_end = active_h_start + p->xres - 1;
> -	} else {
> -		active_h_start = 0;
> -		active_h_end = 0;
> -	}
> +	/*
> +	 * DATA_HCTL_EN controls data timing which can be different from
> +	 * video timing. It is recommended to enable it for all cases, except
> +	 * if compression is enabled in 1 pixel per clock mode
> +	 */
> +	if (p->wide_bus_en)
> +		intf_cfg2 |= BIT(4);
>   
> -	if (p->height != p->yres) {
> -		active_v_start = display_v_start;
> -		active_v_end = active_v_start + (p->yres * hsync_period) - 1;
> -	} else {
> -		active_v_start = 0;
> -		active_v_end = 0;
> -	}
> +	if (p->wide_bus_en)
> +		intf_cfg2 |= BIT(0);
>   
> -	if (active_h_end) {
> -		active_hctl = (active_h_end << 16) | active_h_start;
> -		intf_cfg |= BIT(29);	/* ACTIVE_H_ENABLE */
> -	} else {
> -		active_hctl = 0;
> -	}
> +	/*
> +	 * If widebus is disabled:
> +	 * For uncompressed stream, the data is valid for the entire active
> +	 * window period.
> +	 * For compressed stream, data is valid for a shorter time period
> +	 * inside the active window depending on the compression ratio.
> +	 *
> +	 * If widebus is enabled:
> +	 * For uncompressed stream, data is valid for only half the active
> +	 * window, since the data rate is doubled in this mode.
> +	 * p->width holds the adjusted width for DP but unadjusted width for DSI
> +	 * For compressed stream, data validity window needs to be adjusted for
> +	 * compression ratio and then further halved.
> +	 */

I think we agreed yesterday during the call, that you'd have separate 
patches. One for timing changes and another one for wide_bus addition to 
the timing changes.

> +	data_width = p->width;
> +
> +	if (!dp_intf && p->wide_bus_en)
> +		data_width = p->width >> 1;
> +	else
> +		data_width = p->width;
>   
> -	if (active_v_end)
> -		intf_cfg |= BIT(30); /* ACTIVE_V_ENABLE */
> +	hsync_data_start_x = hsync_start_x;
> +	hsync_data_end_x =  hsync_start_x + data_width - 1;
>   
> -	hsync_ctl = (hsync_period << 16) | p->hsync_pulse_width;
>   	display_hctl = (hsync_end_x << 16) | hsync_start_x;
> +	display_data_hctl = (hsync_data_end_x << 16) | hsync_data_start_x;
>   
> -	if (ctx->cap->type == INTF_EDP || ctx->cap->type == INTF_DP) {
> -		active_h_start = hsync_start_x;
> -		active_h_end = active_h_start + p->xres - 1;
> -		active_v_start = display_v_start;
> -		active_v_end = active_v_start + (p->yres * hsync_period) - 1;
> -
> +	if (dp_intf) {
> +		// DP timing adjustment
>   		display_v_start += p->hsync_pulse_width + p->h_back_porch;
> +		display_v_end   -= p->h_front_porch;
> +	}
> +
> +	active_h_start = hsync_start_x;
> +	active_h_end = active_h_start + p->xres - 1;
> +
> +	active_v_start = display_v_start;
> +	active_v_end = active_v_start + (p->yres * hsync_period) - 1;
>   
> -		active_hctl = (active_h_end << 16) | active_h_start;
> +	intf_cfg |= BIT(29);	/* ACTIVE_H_ENABLE */
> +	intf_cfg |= BIT(30);	/* ACTIVE_V_ENABLE */
> +
> +	active_hctl = (active_h_end << 16) | active_h_start;
> +
> +	if (dp_intf)
>   		display_hctl = active_hctl;
> -	}
>   
>   	den_polarity = 0;
>   	if (ctx->cap->type == INTF_HDMI) {
> @@ -204,6 +232,9 @@ static void dpu_hw_intf_setup_timing_engine(struct dpu_hw_intf *ctx,
>   	DPU_REG_WRITE(c, INTF_FRAME_LINE_COUNT_EN, 0x3);
>   	DPU_REG_WRITE(c, INTF_CONFIG, intf_cfg);
>   	DPU_REG_WRITE(c, INTF_PANEL_FORMAT, panel_format);
> +	DPU_REG_WRITE(c, INTF_CONFIG2, intf_cfg2);
> +	DPU_REG_WRITE(c, INTF_DISPLAY_DATA_HCTL, display_data_hctl);
> +	DPU_REG_WRITE(c, INTF_ACTIVE_DATA_HCTL, active_data_hctl);
>   }
>   
>   static void dpu_hw_intf_enable_timing_engine(
> diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_intf.h b/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_intf.h
> index 3568be8..e4a518a 100644
> --- a/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_intf.h
> +++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_intf.h
> @@ -30,6 +30,8 @@ struct intf_timing_params {
>   	u32 border_clr;
>   	u32 underflow_clr;
>   	u32 hsync_skew;
> +
> +	bool wide_bus_en;
>   };
>   
>   struct intf_prog_fetch {


-- 
With best wishes
Dmitry

Re: [PATCH v3 1/3] drm/msm/dp: revise timing engine programming to support widebus feature

[Dmitry Baryshkov]

On 04/02/2022 21:36, Kuogee Hsieh wrote:
> Widebus feature will transmit two pixel data per pixel clock to interface.
> Timing engine provides driving force for this purpose. This patch base
> on HPG (Hardware Programming Guide) to revise timing engine register
> setting to accommodate both widebus and non widebus application. Also
> horizontal width parameters need to be reduced by half since two pixel
> data are clocked out per pixel clock when widebus feature enabled.
> In addition, revised timing engine function is an generic function and
> intend to be shared by all platforms to reduce maintenance efforts.
> 
> Changes in v2:
> -- remove compression related code from timing
> -- remove op_info from  struct msm_drm_private
> -- remove unnecessary wide_bus_en variables
> -- pass wide_bus_en into timing configuration by struct msm_dp
> 
> Changes in v3:
> -- split patch into 3 patches
> 
> Signed-off-by: Kuogee Hsieh <quic_khsieh@quicinc.com>
> ---
>   drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c        | 10 +++
>   drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.h        |  2 +
>   .../gpu/drm/msm/disp/dpu1/dpu_encoder_phys_vid.c   | 14 +++
>   drivers/gpu/drm/msm/disp/dpu1/dpu_hw_intf.c        | 99 ++++++++++++++--------
>   drivers/gpu/drm/msm/disp/dpu1/dpu_hw_intf.h        |  2 +
>   5 files changed, 93 insertions(+), 34 deletions(-)
> 
> diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c b/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c
> index 0d315b4..0c22839 100644
> --- a/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c
> +++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c
> @@ -208,6 +208,8 @@ struct dpu_encoder_virt {
>   
>   	u32 idle_timeout;
>   
> +	bool wide_bus_en;
> +
>   	struct msm_dp *dp;
>   };
>   
> @@ -217,6 +219,14 @@ static u32 dither_matrix[DITHER_MATRIX_SZ] = {
>   	15, 7, 13, 5, 3, 11, 1, 9, 12, 4, 14, 6, 0, 8, 2, 10
>   };
>   
> +
> +bool dpu_encoder_is_widebus_enabled(struct drm_encoder *drm_enc)
> +{
> +	struct dpu_encoder_virt *dpu_enc = to_dpu_encoder_virt(drm_enc);
> +
> +	return dpu_enc->wide_bus_en;
> +}
> +
>   static void _dpu_encoder_setup_dither(struct dpu_hw_pingpong *hw_pp, unsigned bpc)
>   {
>   	struct dpu_hw_dither_cfg dither_cfg = { 0 };
> diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.h b/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.h
> index 99a5d73..893d74d 100644
> --- a/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.h
> +++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.h
> @@ -168,4 +168,6 @@ int dpu_encoder_get_linecount(struct drm_encoder *drm_enc);
>    */
>   int dpu_encoder_get_frame_count(struct drm_encoder *drm_enc);
>   
> +bool dpu_encoder_is_widebus_enabled(struct drm_encoder *drm_enc);
> +
>   #endif /* __DPU_ENCODER_H__ */

This chunk does not apply against the msm-next. The conflict is trivial, 
but it would be nice to know that the code was tested against the 
current tip.

> diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder_phys_vid.c b/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder_phys_vid.c
> index 185379b..3d6c914 100644
> --- a/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder_phys_vid.c
> +++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder_phys_vid.c
> @@ -110,6 +110,20 @@ static void drm_mode_to_intf_timing_params(
>   		timing->v_back_porch += timing->v_front_porch;
>   		timing->v_front_porch = 0;
>   	}
> +
> +	timing->wide_bus_en = dpu_encoder_is_widebus_enabled(phys_enc->parent);
> +
> +	/*
> +	 * for DP, divide the horizonal parameters by 2 when
> +	 * widebus is enabled
> +	 */
> +	if (timing->wide_bus_en) {
> +		timing->width = timing->width >> 1;
> +		timing->xres = timing->xres >> 1;
> +		timing->h_back_porch = timing->h_back_porch >> 1;
> +		timing->h_front_porch = timing->h_front_porch >> 1;
> +		timing->hsync_pulse_width = timing->hsync_pulse_width >> 1;
> +	}
>   }
>   
>   static u32 get_horizontal_total(const struct intf_timing_params *timing)
> diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_intf.c b/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_intf.c
> index 116e2b5..35d4aaa 100644
> --- a/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_intf.c
> +++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_intf.c
> @@ -33,6 +33,7 @@
>   #define INTF_TP_COLOR1                  0x05C
>   #define INTF_CONFIG2                    0x060
>   #define INTF_DISPLAY_DATA_HCTL          0x064
> +#define INTF_ACTIVE_DATA_HCTL           0x068
>   #define INTF_FRAME_LINE_COUNT_EN        0x0A8
>   #define INTF_FRAME_COUNT                0x0AC
>   #define   INTF_LINE_COUNT               0x0B0
> @@ -90,68 +91,95 @@ static void dpu_hw_intf_setup_timing_engine(struct dpu_hw_intf *ctx,
>   	u32 hsync_period, vsync_period;
>   	u32 display_v_start, display_v_end;
>   	u32 hsync_start_x, hsync_end_x;
> +	u32 hsync_data_start_x, hsync_data_end_x;
>   	u32 active_h_start, active_h_end;
>   	u32 active_v_start, active_v_end;
>   	u32 active_hctl, display_hctl, hsync_ctl;
>   	u32 polarity_ctl, den_polarity, hsync_polarity, vsync_polarity;
>   	u32 panel_format;
> -	u32 intf_cfg, intf_cfg2 = 0, display_data_hctl = 0;
> +	u32 intf_cfg, intf_cfg2 = 0;
> +	u32 display_data_hctl = 0, active_data_hctl = 0;
> +	u32 data_width;
> +	bool dp_intf = false;
>   
>   	/* read interface_cfg */
>   	intf_cfg = DPU_REG_READ(c, INTF_CONFIG);
> +
> +	if (ctx->cap->type == INTF_EDP || ctx->cap->type == INTF_DP)
> +		dp_intf = true;
> +
>   	hsync_period = p->hsync_pulse_width + p->h_back_porch + p->width +
>   	p->h_front_porch;
>   	vsync_period = p->vsync_pulse_width + p->v_back_porch + p->height +
>   	p->v_front_porch;
>   
>   	display_v_start = ((p->vsync_pulse_width + p->v_back_porch) *
> -	hsync_period) + p->hsync_skew;
> +			hsync_period) + p->hsync_skew;
>   	display_v_end = ((vsync_period - p->v_front_porch) * hsync_period) +
> -	p->hsync_skew - 1;
> +			p->hsync_skew - 1;
> +
> +	hsync_ctl = (hsync_period << 16) | p->hsync_pulse_width;
>   
>   	hsync_start_x = p->h_back_porch + p->hsync_pulse_width;
>   	hsync_end_x = hsync_period - p->h_front_porch - 1;
>   
> -	if (p->width != p->xres) {
> -		active_h_start = hsync_start_x;
> -		active_h_end = active_h_start + p->xres - 1;
> -	} else {
> -		active_h_start = 0;
> -		active_h_end = 0;
> -	}
> +	/*
> +	 * DATA_HCTL_EN controls data timing which can be different from
> +	 * video timing. It is recommended to enable it for all cases, except
> +	 * if compression is enabled in 1 pixel per clock mode
> +	 */
> +	if (p->wide_bus_en)
> +		intf_cfg2 |= BIT(4);
>   
> -	if (p->height != p->yres) {
> -		active_v_start = display_v_start;
> -		active_v_end = active_v_start + (p->yres * hsync_period) - 1;
> -	} else {
> -		active_v_start = 0;
> -		active_v_end = 0;
> -	}
> +	if (p->wide_bus_en)
> +		intf_cfg2 |= BIT(0);
>   
> -	if (active_h_end) {
> -		active_hctl = (active_h_end << 16) | active_h_start;
> -		intf_cfg |= BIT(29);	/* ACTIVE_H_ENABLE */
> -	} else {
> -		active_hctl = 0;
> -	}
> +	/*
> +	 * If widebus is disabled:
> +	 * For uncompressed stream, the data is valid for the entire active
> +	 * window period.
> +	 * For compressed stream, data is valid for a shorter time period
> +	 * inside the active window depending on the compression ratio.
> +	 *
> +	 * If widebus is enabled:
> +	 * For uncompressed stream, data is valid for only half the active
> +	 * window, since the data rate is doubled in this mode.
> +	 * p->width holds the adjusted width for DP but unadjusted width for DSI
> +	 * For compressed stream, data validity window needs to be adjusted for
> +	 * compression ratio and then further halved.
> +	 */
> +	data_width = p->width;

This assignment is rewritten in the next few lines! Please drop it, it's 
unused.

> +
> +	if (!dp_intf && p->wide_bus_en)

This condition does not make sense. wide_bus_en can only be enabled for 
dp_intf, can it not? So the condition is always false.

> +		data_width = p->width >> 1;
> +	else
> +		data_width = p->width;
>   
> -	if (active_v_end)
> -		intf_cfg |= BIT(30); /* ACTIVE_V_ENABLE */
> +	hsync_data_start_x = hsync_start_x;
> +	hsync_data_end_x =  hsync_start_x + data_width - 1;
>   
> -	hsync_ctl = (hsync_period << 16) | p->hsync_pulse_width;
>   	display_hctl = (hsync_end_x << 16) | hsync_start_x;
> +	display_data_hctl = (hsync_data_end_x << 16) | hsync_data_start_x;
>   
> -	if (ctx->cap->type == INTF_EDP || ctx->cap->type == INTF_DP) {
> -		active_h_start = hsync_start_x;
> -		active_h_end = active_h_start + p->xres - 1;
> -		active_v_start = display_v_start;
> -		active_v_end = active_v_start + (p->yres * hsync_period) - 1;
> -
> +	if (dp_intf) {
> +		// DP timing adjustment

This is the only place with the C99 comment. Please use the surrounding 
syntax.

>   		display_v_start += p->hsync_pulse_width + p->h_back_porch;
> +		display_v_end   -= p->h_front_porch;
> +	}
> +
> +	active_h_start = hsync_start_x;
> +	active_h_end = active_h_start + p->xres - 1;
> +
> +	active_v_start = display_v_start;
> +	active_v_end = active_v_start + (p->yres * hsync_period) - 1;

These assignments were only applied for the DP/eDP case. Could you 
please elaborate the change? Why are you enabling them for the DSI and 
HDMI outputs?

>   
> -		active_hctl = (active_h_end << 16) | active_h_start;
> +	intf_cfg |= BIT(29);	/* ACTIVE_H_ENABLE */
> +	intf_cfg |= BIT(30);	/* ACTIVE_V_ENABLE */

These were enabled only when active_h_end / active_v_end were non-zero. 
Any comments?

> +
> +	active_hctl = (active_h_end << 16) | active_h_start;
> +
> +	if (dp_intf)
>   		display_hctl = active_hctl;
> -	}
>   
>   	den_polarity = 0;
>   	if (ctx->cap->type == INTF_HDMI) {
> @@ -204,6 +232,9 @@ static void dpu_hw_intf_setup_timing_engine(struct dpu_hw_intf *ctx,
>   	DPU_REG_WRITE(c, INTF_FRAME_LINE_COUNT_EN, 0x3);
>   	DPU_REG_WRITE(c, INTF_CONFIG, intf_cfg);
>   	DPU_REG_WRITE(c, INTF_PANEL_FORMAT, panel_format);
> +	DPU_REG_WRITE(c, INTF_CONFIG2, intf_cfg2);
> +	DPU_REG_WRITE(c, INTF_DISPLAY_DATA_HCTL, display_data_hctl);
> +	DPU_REG_WRITE(c, INTF_ACTIVE_DATA_HCTL, active_data_hctl);

I see. These writes are currently under the if (ctx->cap->features & 
BIT(DPU_DATA_HCTL_EN)) condition. Please leave them there unless the 
condition is wrong.

>   }
>   
>   static void dpu_hw_intf_enable_timing_engine(
> diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_intf.h b/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_intf.h
> index 3568be8..e4a518a 100644
> --- a/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_intf.h
> +++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_intf.h
> @@ -30,6 +30,8 @@ struct intf_timing_params {
>   	u32 border_clr;
>   	u32 underflow_clr;
>   	u32 hsync_skew;
> +
> +	bool wide_bus_en;
>   };
>   
>   struct intf_prog_fetch {


-- 
With best wishes
Dmitry

Re: [PATCH v3 1/3] drm/msm/dp: revise timing engine programming to support widebus feature

[Kuogee Hsieh]

On 2/4/2022 2:05 PM, Dmitry Baryshkov wrote:
> On 04/02/2022 21:36, Kuogee Hsieh wrote:
>> Widebus feature will transmit two pixel data per pixel clock to 
>> interface.
>> Timing engine provides driving force for this purpose. This patch base
>> on HPG (Hardware Programming Guide) to revise timing engine register
>> setting to accommodate both widebus and non widebus application. Also
>> horizontal width parameters need to be reduced by half since two pixel
>> data are clocked out per pixel clock when widebus feature enabled.
>> In addition, revised timing engine function is an generic function and
>> intend to be shared by all platforms to reduce maintenance efforts.
>>
>> Changes in v2:
>> -- remove compression related code from timing
>> -- remove op_info from  struct msm_drm_private
>> -- remove unnecessary wide_bus_en variables
>> -- pass wide_bus_en into timing configuration by struct msm_dp
>>
>> Changes in v3:
>> -- split patch into 3 patches
>>
>> Signed-off-by: Kuogee Hsieh <quic_khsieh@quicinc.com>
>> ---
>>   drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c        | 10 +++
>>   drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.h        |  2 +
>>   .../gpu/drm/msm/disp/dpu1/dpu_encoder_phys_vid.c   | 14 +++
>>   drivers/gpu/drm/msm/disp/dpu1/dpu_hw_intf.c        | 99 
>> ++++++++++++++--------
>>   drivers/gpu/drm/msm/disp/dpu1/dpu_hw_intf.h        |  2 +
>>   5 files changed, 93 insertions(+), 34 deletions(-)
>>
>> diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c 
>> b/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c
>> index 0d315b4..0c22839 100644
>> --- a/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c
>> +++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c
>> @@ -208,6 +208,8 @@ struct dpu_encoder_virt {
>>         u32 idle_timeout;
>>   +    bool wide_bus_en;
>> +
>>       struct msm_dp *dp;
>>   };
>>   @@ -217,6 +219,14 @@ static u32 dither_matrix[DITHER_MATRIX_SZ] = {
>>       15, 7, 13, 5, 3, 11, 1, 9, 12, 4, 14, 6, 0, 8, 2, 10
>>   };
>>   +
>> +bool dpu_encoder_is_widebus_enabled(struct drm_encoder *drm_enc)
>> +{
>> +    struct dpu_encoder_virt *dpu_enc = to_dpu_encoder_virt(drm_enc);
>> +
>> +    return dpu_enc->wide_bus_en;
>> +}
>> +
>>   static void _dpu_encoder_setup_dither(struct dpu_hw_pingpong 
>> *hw_pp, unsigned bpc)
>>   {
>>       struct dpu_hw_dither_cfg dither_cfg = { 0 };
>> diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.h 
>> b/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.h
>> index 99a5d73..893d74d 100644
>> --- a/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.h
>> +++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.h
>> @@ -168,4 +168,6 @@ int dpu_encoder_get_linecount(struct drm_encoder 
>> *drm_enc);
>>    */
>>   int dpu_encoder_get_frame_count(struct drm_encoder *drm_enc);
>>   +bool dpu_encoder_is_widebus_enabled(struct drm_encoder *drm_enc);
>> +
>>   #endif /* __DPU_ENCODER_H__ */
>
> This chunk does not apply against the msm-next. The conflict is 
> trivial, but it would be nice to know that the code was tested against 
> the current tip.
My fault, I forget to cherry-pick to msm-next this time before upload 
for review
>
>> diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder_phys_vid.c 
>> b/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder_phys_vid.c
>> index 185379b..3d6c914 100644
>> --- a/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder_phys_vid.c
>> +++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder_phys_vid.c
>> @@ -110,6 +110,20 @@ static void drm_mode_to_intf_timing_params(
>>           timing->v_back_porch += timing->v_front_porch;
>>           timing->v_front_porch = 0;
>>       }
>> +
>> +    timing->wide_bus_en = 
>> dpu_encoder_is_widebus_enabled(phys_enc->parent);
>> +
>> +    /*
>> +     * for DP, divide the horizonal parameters by 2 when
>> +     * widebus is enabled
>> +     */
>> +    if (timing->wide_bus_en) {
>> +        timing->width = timing->width >> 1;
>> +        timing->xres = timing->xres >> 1;
>> +        timing->h_back_porch = timing->h_back_porch >> 1;
>> +        timing->h_front_porch = timing->h_front_porch >> 1;
>> +        timing->hsync_pulse_width = timing->hsync_pulse_width >> 1;
>> +    }
>>   }
>>     static u32 get_horizontal_total(const struct intf_timing_params 
>> *timing)
>> diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_intf.c 
>> b/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_intf.c
>> index 116e2b5..35d4aaa 100644
>> --- a/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_intf.c
>> +++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_intf.c
>> @@ -33,6 +33,7 @@
>>   #define INTF_TP_COLOR1                  0x05C
>>   #define INTF_CONFIG2                    0x060
>>   #define INTF_DISPLAY_DATA_HCTL          0x064
>> +#define INTF_ACTIVE_DATA_HCTL           0x068
>>   #define INTF_FRAME_LINE_COUNT_EN        0x0A8
>>   #define INTF_FRAME_COUNT                0x0AC
>>   #define   INTF_LINE_COUNT               0x0B0
>> @@ -90,68 +91,95 @@ static void 
>> dpu_hw_intf_setup_timing_engine(struct dpu_hw_intf *ctx,
>>       u32 hsync_period, vsync_period;
>>       u32 display_v_start, display_v_end;
>>       u32 hsync_start_x, hsync_end_x;
>> +    u32 hsync_data_start_x, hsync_data_end_x;
>>       u32 active_h_start, active_h_end;
>>       u32 active_v_start, active_v_end;
>>       u32 active_hctl, display_hctl, hsync_ctl;
>>       u32 polarity_ctl, den_polarity, hsync_polarity, vsync_polarity;
>>       u32 panel_format;
>> -    u32 intf_cfg, intf_cfg2 = 0, display_data_hctl = 0;
>> +    u32 intf_cfg, intf_cfg2 = 0;
>> +    u32 display_data_hctl = 0, active_data_hctl = 0;
>> +    u32 data_width;
>> +    bool dp_intf = false;
>>         /* read interface_cfg */
>>       intf_cfg = DPU_REG_READ(c, INTF_CONFIG);
>> +
>> +    if (ctx->cap->type == INTF_EDP || ctx->cap->type == INTF_DP)
>> +        dp_intf = true;
>> +
>>       hsync_period = p->hsync_pulse_width + p->h_back_porch + p->width +
>>       p->h_front_porch;
>>       vsync_period = p->vsync_pulse_width + p->v_back_porch + 
>> p->height +
>>       p->v_front_porch;
>>         display_v_start = ((p->vsync_pulse_width + p->v_back_porch) *
>> -    hsync_period) + p->hsync_skew;
>> +            hsync_period) + p->hsync_skew;
>>       display_v_end = ((vsync_period - p->v_front_porch) * 
>> hsync_period) +
>> -    p->hsync_skew - 1;
>> +            p->hsync_skew - 1;
>> +
>> +    hsync_ctl = (hsync_period << 16) | p->hsync_pulse_width;
>>         hsync_start_x = p->h_back_porch + p->hsync_pulse_width;
>>       hsync_end_x = hsync_period - p->h_front_porch - 1;
>>   -    if (p->width != p->xres) {
>> -        active_h_start = hsync_start_x;
>> -        active_h_end = active_h_start + p->xres - 1;
>> -    } else {
>> -        active_h_start = 0;
>> -        active_h_end = 0;
>> -    }
>> +    /*
>> +     * DATA_HCTL_EN controls data timing which can be different from
>> +     * video timing. It is recommended to enable it for all cases, 
>> except
>> +     * if compression is enabled in 1 pixel per clock mode
>> +     */
>> +    if (p->wide_bus_en)
>> +        intf_cfg2 |= BIT(4);
>>   -    if (p->height != p->yres) {
>> -        active_v_start = display_v_start;
>> -        active_v_end = active_v_start + (p->yres * hsync_period) - 1;
>> -    } else {
>> -        active_v_start = 0;
>> -        active_v_end = 0;
>> -    }
>> +    if (p->wide_bus_en)
>> +        intf_cfg2 |= BIT(0);
>>   -    if (active_h_end) {
>> -        active_hctl = (active_h_end << 16) | active_h_start;
>> -        intf_cfg |= BIT(29);    /* ACTIVE_H_ENABLE */
>> -    } else {
>> -        active_hctl = 0;
>> -    }
>> +    /*
>> +     * If widebus is disabled:
>> +     * For uncompressed stream, the data is valid for the entire active
>> +     * window period.
>> +     * For compressed stream, data is valid for a shorter time period
>> +     * inside the active window depending on the compression ratio.
>> +     *
>> +     * If widebus is enabled:
>> +     * For uncompressed stream, data is valid for only half the active
>> +     * window, since the data rate is doubled in this mode.
>> +     * p->width holds the adjusted width for DP but unadjusted width 
>> for DSI
>> +     * For compressed stream, data validity window needs to be 
>> adjusted for
>> +     * compression ratio and then further halved.
>> +     */
>> +    data_width = p->width;
>
> This assignment is rewritten in the next few lines! Please drop it, 
> it's unused.
>
>> +
>> +    if (!dp_intf && p->wide_bus_en)
>
> This condition does not make sense. wide_bus_en can only be enabled 
> for dp_intf, can it not? So the condition is always false.
>
>> +        data_width = p->width >> 1;
>> +    else
>> +        data_width = p->width;
>>   -    if (active_v_end)
>> -        intf_cfg |= BIT(30); /* ACTIVE_V_ENABLE */
>> +    hsync_data_start_x = hsync_start_x;
>> +    hsync_data_end_x =  hsync_start_x + data_width - 1;
>>   -    hsync_ctl = (hsync_period << 16) | p->hsync_pulse_width;
>>       display_hctl = (hsync_end_x << 16) | hsync_start_x;
>> +    display_data_hctl = (hsync_data_end_x << 16) | hsync_data_start_x;
>>   -    if (ctx->cap->type == INTF_EDP || ctx->cap->type == INTF_DP) {
>> -        active_h_start = hsync_start_x;
>> -        active_h_end = active_h_start + p->xres - 1;
>> -        active_v_start = display_v_start;
>> -        active_v_end = active_v_start + (p->yres * hsync_period) - 1;
>> -
>> +    if (dp_intf) {
>> +        // DP timing adjustment
>
> This is the only place with the C99 comment. Please use the 
> surrounding syntax.
>
>>           display_v_start += p->hsync_pulse_width + p->h_back_porch;
>> +        display_v_end   -= p->h_front_porch;
>> +    }
>> +
>> +    active_h_start = hsync_start_x;
>> +    active_h_end = active_h_start + p->xres - 1;
>> +
>> +    active_v_start = display_v_start;
>> +    active_v_end = active_v_start + (p->yres * hsync_period) - 1;
>
> These assignments were only applied for the DP/eDP case. Could you 
> please elaborate the change? Why are you enabling them for the DSI and 
> HDMI outputs?

All interface have those registers for active_v_xx and acrive_h_xx, I am 
not sure they are dedicated for DP or eDP.

If so, then those register should be no effects after written.

>
>>   -        active_hctl = (active_h_end << 16) | active_h_start;
>> +    intf_cfg |= BIT(29);    /* ACTIVE_H_ENABLE */
>> +    intf_cfg |= BIT(30);    /* ACTIVE_V_ENABLE */
>
> These were enabled only when active_h_end / active_v_end were 
> non-zero. Any comments?
active_h_end and active_v_end should never be 0.
>
>> +
>> +    active_hctl = (active_h_end << 16) | active_h_start;
>> +
>> +    if (dp_intf)
>>           display_hctl = active_hctl;
>> -    }
>>         den_polarity = 0;
>>       if (ctx->cap->type == INTF_HDMI) {
>> @@ -204,6 +232,9 @@ static void 
>> dpu_hw_intf_setup_timing_engine(struct dpu_hw_intf *ctx,
>>       DPU_REG_WRITE(c, INTF_FRAME_LINE_COUNT_EN, 0x3);
>>       DPU_REG_WRITE(c, INTF_CONFIG, intf_cfg);
>>       DPU_REG_WRITE(c, INTF_PANEL_FORMAT, panel_format);
>> +    DPU_REG_WRITE(c, INTF_CONFIG2, intf_cfg2);
>> +    DPU_REG_WRITE(c, INTF_DISPLAY_DATA_HCTL, display_data_hctl);
>> +    DPU_REG_WRITE(c, INTF_ACTIVE_DATA_HCTL, active_data_hctl);
>
> I see. These writes are currently under the if (ctx->cap->features & 
> BIT(DPU_DATA_HCTL_EN)) condition. Please leave them there unless the 
> condition is wrong.
>
>>   }
>>     static void dpu_hw_intf_enable_timing_engine(
>> diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_intf.h 
>> b/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_intf.h
>> index 3568be8..e4a518a 100644
>> --- a/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_intf.h
>> +++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_intf.h
>> @@ -30,6 +30,8 @@ struct intf_timing_params {
>>       u32 border_clr;
>>       u32 underflow_clr;
>>       u32 hsync_skew;
>> +
>> +    bool wide_bus_en;
>>   };
>>     struct intf_prog_fetch {
>
>

Re: [PATCH v3 1/3] drm/msm/dp: revise timing engine programming to support widebus feature

[Dmitry Baryshkov]

On 05/02/2022 02:26, Kuogee Hsieh wrote:
> 
> On 2/4/2022 2:05 PM, Dmitry Baryshkov wrote:
>> On 04/02/2022 21:36, Kuogee Hsieh wrote:
>>> Widebus feature will transmit two pixel data per pixel clock to 
>>> interface.
>>> Timing engine provides driving force for this purpose. This patch base
>>> on HPG (Hardware Programming Guide) to revise timing engine register
>>> setting to accommodate both widebus and non widebus application. Also
>>> horizontal width parameters need to be reduced by half since two pixel
>>> data are clocked out per pixel clock when widebus feature enabled.
>>> In addition, revised timing engine function is an generic function and
>>> intend to be shared by all platforms to reduce maintenance efforts.
>>>
>>> Changes in v2:
>>> -- remove compression related code from timing
>>> -- remove op_info from  struct msm_drm_private
>>> -- remove unnecessary wide_bus_en variables
>>> -- pass wide_bus_en into timing configuration by struct msm_dp
>>>
>>> Changes in v3:
>>> -- split patch into 3 patches
>>>
>>> Signed-off-by: Kuogee Hsieh <quic_khsieh@quicinc.com>
>>> ---
>>>   drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c        | 10 +++
>>>   drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.h        |  2 +
>>>   .../gpu/drm/msm/disp/dpu1/dpu_encoder_phys_vid.c   | 14 +++
>>>   drivers/gpu/drm/msm/disp/dpu1/dpu_hw_intf.c        | 99 
>>> ++++++++++++++--------
>>>   drivers/gpu/drm/msm/disp/dpu1/dpu_hw_intf.h        |  2 +
>>>   5 files changed, 93 insertions(+), 34 deletions(-)
>>>
>>> diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c 
>>> b/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c
>>> index 0d315b4..0c22839 100644
>>> --- a/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c
>>> +++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c
>>> @@ -208,6 +208,8 @@ struct dpu_encoder_virt {
>>>         u32 idle_timeout;
>>>   +    bool wide_bus_en;
>>> +
>>>       struct msm_dp *dp;
>>>   };
>>>   @@ -217,6 +219,14 @@ static u32 dither_matrix[DITHER_MATRIX_SZ] = {
>>>       15, 7, 13, 5, 3, 11, 1, 9, 12, 4, 14, 6, 0, 8, 2, 10
>>>   };
>>>   +
>>> +bool dpu_encoder_is_widebus_enabled(struct drm_encoder *drm_enc)
>>> +{
>>> +    struct dpu_encoder_virt *dpu_enc = to_dpu_encoder_virt(drm_enc);
>>> +
>>> +    return dpu_enc->wide_bus_en;
>>> +}
>>> +
>>>   static void _dpu_encoder_setup_dither(struct dpu_hw_pingpong 
>>> *hw_pp, unsigned bpc)
>>>   {
>>>       struct dpu_hw_dither_cfg dither_cfg = { 0 };
>>> diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.h 
>>> b/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.h
>>> index 99a5d73..893d74d 100644
>>> --- a/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.h
>>> +++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.h
>>> @@ -168,4 +168,6 @@ int dpu_encoder_get_linecount(struct drm_encoder 
>>> *drm_enc);
>>>    */
>>>   int dpu_encoder_get_frame_count(struct drm_encoder *drm_enc);
>>>   +bool dpu_encoder_is_widebus_enabled(struct drm_encoder *drm_enc);
>>> +
>>>   #endif /* __DPU_ENCODER_H__ */
>>
>> This chunk does not apply against the msm-next. The conflict is 
>> trivial, but it would be nice to know that the code was tested against 
>> the current tip.
> My fault, I forget to cherry-pick to msm-next this time before upload 
> for review
>>
>>> diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder_phys_vid.c 
>>> b/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder_phys_vid.c
>>> index 185379b..3d6c914 100644
>>> --- a/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder_phys_vid.c
>>> +++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder_phys_vid.c
>>> @@ -110,6 +110,20 @@ static void drm_mode_to_intf_timing_params(
>>>           timing->v_back_porch += timing->v_front_porch;
>>>           timing->v_front_porch = 0;
>>>       }
>>> +
>>> +    timing->wide_bus_en = 
>>> dpu_encoder_is_widebus_enabled(phys_enc->parent);
>>> +
>>> +    /*
>>> +     * for DP, divide the horizonal parameters by 2 when
>>> +     * widebus is enabled
>>> +     */
>>> +    if (timing->wide_bus_en) {
>>> +        timing->width = timing->width >> 1;
>>> +        timing->xres = timing->xres >> 1;
>>> +        timing->h_back_porch = timing->h_back_porch >> 1;
>>> +        timing->h_front_porch = timing->h_front_porch >> 1;
>>> +        timing->hsync_pulse_width = timing->hsync_pulse_width >> 1;
>>> +    }
>>>   }
>>>     static u32 get_horizontal_total(const struct intf_timing_params 
>>> *timing)
>>> diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_intf.c 
>>> b/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_intf.c
>>> index 116e2b5..35d4aaa 100644
>>> --- a/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_intf.c
>>> +++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_intf.c
>>> @@ -33,6 +33,7 @@
>>>   #define INTF_TP_COLOR1                  0x05C
>>>   #define INTF_CONFIG2                    0x060
>>>   #define INTF_DISPLAY_DATA_HCTL          0x064
>>> +#define INTF_ACTIVE_DATA_HCTL           0x068
>>>   #define INTF_FRAME_LINE_COUNT_EN        0x0A8
>>>   #define INTF_FRAME_COUNT                0x0AC
>>>   #define   INTF_LINE_COUNT               0x0B0
>>> @@ -90,68 +91,95 @@ static void 
>>> dpu_hw_intf_setup_timing_engine(struct dpu_hw_intf *ctx,
>>>       u32 hsync_period, vsync_period;
>>>       u32 display_v_start, display_v_end;
>>>       u32 hsync_start_x, hsync_end_x;
>>> +    u32 hsync_data_start_x, hsync_data_end_x;
>>>       u32 active_h_start, active_h_end;
>>>       u32 active_v_start, active_v_end;
>>>       u32 active_hctl, display_hctl, hsync_ctl;
>>>       u32 polarity_ctl, den_polarity, hsync_polarity, vsync_polarity;
>>>       u32 panel_format;
>>> -    u32 intf_cfg, intf_cfg2 = 0, display_data_hctl = 0;
>>> +    u32 intf_cfg, intf_cfg2 = 0;
>>> +    u32 display_data_hctl = 0, active_data_hctl = 0;
>>> +    u32 data_width;
>>> +    bool dp_intf = false;
>>>         /* read interface_cfg */
>>>       intf_cfg = DPU_REG_READ(c, INTF_CONFIG);
>>> +
>>> +    if (ctx->cap->type == INTF_EDP || ctx->cap->type == INTF_DP)
>>> +        dp_intf = true;
>>> +
>>>       hsync_period = p->hsync_pulse_width + p->h_back_porch + p->width +
>>>       p->h_front_porch;
>>>       vsync_period = p->vsync_pulse_width + p->v_back_porch + 
>>> p->height +
>>>       p->v_front_porch;
>>>         display_v_start = ((p->vsync_pulse_width + p->v_back_porch) *
>>> -    hsync_period) + p->hsync_skew;
>>> +            hsync_period) + p->hsync_skew;
>>>       display_v_end = ((vsync_period - p->v_front_porch) * 
>>> hsync_period) +
>>> -    p->hsync_skew - 1;
>>> +            p->hsync_skew - 1;
>>> +
>>> +    hsync_ctl = (hsync_period << 16) | p->hsync_pulse_width;
>>>         hsync_start_x = p->h_back_porch + p->hsync_pulse_width;
>>>       hsync_end_x = hsync_period - p->h_front_porch - 1;
>>>   -    if (p->width != p->xres) {
>>> -        active_h_start = hsync_start_x;
>>> -        active_h_end = active_h_start + p->xres - 1;
>>> -    } else {
>>> -        active_h_start = 0;
>>> -        active_h_end = 0;
>>> -    }
>>> +    /*
>>> +     * DATA_HCTL_EN controls data timing which can be different from
>>> +     * video timing. It is recommended to enable it for all cases, 
>>> except
>>> +     * if compression is enabled in 1 pixel per clock mode
>>> +     */
>>> +    if (p->wide_bus_en)
>>> +        intf_cfg2 |= BIT(4);
>>>   -    if (p->height != p->yres) {
>>> -        active_v_start = display_v_start;
>>> -        active_v_end = active_v_start + (p->yres * hsync_period) - 1;
>>> -    } else {
>>> -        active_v_start = 0;
>>> -        active_v_end = 0;
>>> -    }
>>> +    if (p->wide_bus_en)
>>> +        intf_cfg2 |= BIT(0);
>>>   -    if (active_h_end) {
>>> -        active_hctl = (active_h_end << 16) | active_h_start;
>>> -        intf_cfg |= BIT(29);    /* ACTIVE_H_ENABLE */
>>> -    } else {
>>> -        active_hctl = 0;
>>> -    }
>>> +    /*
>>> +     * If widebus is disabled:
>>> +     * For uncompressed stream, the data is valid for the entire active
>>> +     * window period.
>>> +     * For compressed stream, data is valid for a shorter time period
>>> +     * inside the active window depending on the compression ratio.
>>> +     *
>>> +     * If widebus is enabled:
>>> +     * For uncompressed stream, data is valid for only half the active
>>> +     * window, since the data rate is doubled in this mode.
>>> +     * p->width holds the adjusted width for DP but unadjusted width 
>>> for DSI
>>> +     * For compressed stream, data validity window needs to be 
>>> adjusted for
>>> +     * compression ratio and then further halved.
>>> +     */
>>> +    data_width = p->width;
>>
>> This assignment is rewritten in the next few lines! Please drop it, 
>> it's unused.
>>
>>> +
>>> +    if (!dp_intf && p->wide_bus_en)
>>
>> This condition does not make sense. wide_bus_en can only be enabled 
>> for dp_intf, can it not? So the condition is always false.
>>
>>> +        data_width = p->width >> 1;
>>> +    else
>>> +        data_width = p->width;
>>>   -    if (active_v_end)
>>> -        intf_cfg |= BIT(30); /* ACTIVE_V_ENABLE */
>>> +    hsync_data_start_x = hsync_start_x;
>>> +    hsync_data_end_x =  hsync_start_x + data_width - 1;
>>>   -    hsync_ctl = (hsync_period << 16) | p->hsync_pulse_width;
>>>       display_hctl = (hsync_end_x << 16) | hsync_start_x;
>>> +    display_data_hctl = (hsync_data_end_x << 16) | hsync_data_start_x;
>>>   -    if (ctx->cap->type == INTF_EDP || ctx->cap->type == INTF_DP) {
>>> -        active_h_start = hsync_start_x;
>>> -        active_h_end = active_h_start + p->xres - 1;
>>> -        active_v_start = display_v_start;
>>> -        active_v_end = active_v_start + (p->yres * hsync_period) - 1;
>>> -
>>> +    if (dp_intf) {
>>> +        // DP timing adjustment
>>
>> This is the only place with the C99 comment. Please use the 
>> surrounding syntax.
>>
>>>           display_v_start += p->hsync_pulse_width + p->h_back_porch;
>>> +        display_v_end   -= p->h_front_porch;
>>> +    }
>>> +
>>> +    active_h_start = hsync_start_x;
>>> +    active_h_end = active_h_start + p->xres - 1;
>>> +
>>> +    active_v_start = display_v_start;
>>> +    active_v_end = active_v_start + (p->yres * hsync_period) - 1;
>>
>> These assignments were only applied for the DP/eDP case. Could you 
>> please elaborate the change? Why are you enabling them for the DSI and 
>> HDMI outputs?
> 
> All interface have those registers for active_v_xx and acrive_h_xx, I am 
> not sure they are dedicated for DP or eDP.

It's not about the dedication. Current code has separate codepaths for 
the generic case and for DP/eDP. You are effectively replacing generic 
code with the code that is currently limited to DP/eDP.

> 
> If so, then those register should be no effects after written.
> 
>>
>>>   -        active_hctl = (active_h_end << 16) | active_h_start;
>>> +    intf_cfg |= BIT(29);    /* ACTIVE_H_ENABLE */
>>> +    intf_cfg |= BIT(30);    /* ACTIVE_V_ENABLE */
>>
>> These were enabled only when active_h_end / active_v_end were 
>> non-zero. Any comments?
> active_h_end and active_v_end should never be 0.

Quoting existing code:

  -    if (p->width != p->xres) {
  -        active_h_start = hsync_start_x;
  -        active_h_end = active_h_start + p->xres - 1;
  -    } else {
  -        active_h_start = 0;
  -        active_h_end = 0;
  -    }


So active_h_end would be 0 if p->width is equal to p->xres.
Is there an error? If so, it should be fixed in a separate patch (with 
the proper 'Fixes: ' tag, so that it can be backported to the stable 
kernel trees.


>>
>>> +
>>> +    active_hctl = (active_h_end << 16) | active_h_start;
>>> +
>>> +    if (dp_intf)
>>>           display_hctl = active_hctl;
>>> -    }
>>>         den_polarity = 0;
>>>       if (ctx->cap->type == INTF_HDMI) {
>>> @@ -204,6 +232,9 @@ static void 
>>> dpu_hw_intf_setup_timing_engine(struct dpu_hw_intf *ctx,
>>>       DPU_REG_WRITE(c, INTF_FRAME_LINE_COUNT_EN, 0x3);
>>>       DPU_REG_WRITE(c, INTF_CONFIG, intf_cfg);
>>>       DPU_REG_WRITE(c, INTF_PANEL_FORMAT, panel_format);
>>> +    DPU_REG_WRITE(c, INTF_CONFIG2, intf_cfg2);
>>> +    DPU_REG_WRITE(c, INTF_DISPLAY_DATA_HCTL, display_data_hctl);
>>> +    DPU_REG_WRITE(c, INTF_ACTIVE_DATA_HCTL, active_data_hctl);
>>
>> I see. These writes are currently under the if (ctx->cap->features & 
>> BIT(DPU_DATA_HCTL_EN)) condition. Please leave them there unless the 
>> condition is wrong.
>>
>>>   }
>>>     static void dpu_hw_intf_enable_timing_engine(
>>> diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_intf.h 
>>> b/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_intf.h
>>> index 3568be8..e4a518a 100644
>>> --- a/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_intf.h
>>> +++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_intf.h
>>> @@ -30,6 +30,8 @@ struct intf_timing_params {
>>>       u32 border_clr;
>>>       u32 underflow_clr;
>>>       u32 hsync_skew;
>>> +
>>> +    bool wide_bus_en;
>>>   };
>>>     struct intf_prog_fetch {
>>
>>


-- 
With best wishes
Dmitry

[PATCH v3 2/3] drm/msm/dp: revise timing engine programming to support compression (DSC)

[Kuogee Hsieh]

Divides horizontal width by 3 at timing engine of interface. There are
major part of  compression (DSC) programming have to be done at DSC
controller which is not covered by this patch.

Signed-off-by: Kuogee Hsieh <quic_khsieh@quicinc.com>
---
 drivers/gpu/drm/msm/disp/dpu1/dpu_hw_intf.c | 22 ++++++++++++++++++----
 drivers/gpu/drm/msm/disp/dpu1/dpu_hw_intf.h |  3 +++
 2 files changed, 21 insertions(+), 4 deletions(-)

diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_intf.c b/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_intf.c
index 35d4aaa..ee7ca34 100644
--- a/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_intf.c
+++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_intf.c
@@ -128,7 +128,7 @@ static void dpu_hw_intf_setup_timing_engine(struct dpu_hw_intf *ctx,
 	 * video timing. It is recommended to enable it for all cases, except
 	 * if compression is enabled in 1 pixel per clock mode
 	 */
-	if (p->wide_bus_en)
+	if (!p->compression_en || p->wide_bus_en)
 		intf_cfg2 |= BIT(4);
 
 	if (p->wide_bus_en)
@@ -150,10 +150,16 @@ static void dpu_hw_intf_setup_timing_engine(struct dpu_hw_intf *ctx,
 	 */
 	data_width = p->width;
 
-	if (!dp_intf && p->wide_bus_en)
+	if (p->compression_en) {
+		data_width = DIV_ROUND_UP(p->dce_bytes_per_line, 3);
+
+		if (p->wide_bus_en)
+			data_width >>= 1;
+	} else if (!dp_intf && p->wide_bus_en) {
 		data_width = p->width >> 1;
-	else
+	} else {
 		data_width = p->width;
+	}
 
 	hsync_data_start_x = hsync_start_x;
 	hsync_data_end_x =  hsync_start_x + data_width - 1;
@@ -178,8 +184,16 @@ static void dpu_hw_intf_setup_timing_engine(struct dpu_hw_intf *ctx,
 
 	active_hctl = (active_h_end << 16) | active_h_start;
 
-	if (dp_intf)
+	if (dp_intf) {
 		display_hctl = active_hctl;
+		if (p->compression_en) {
+			active_data_hctl = (hsync_start_x +
+					p->extra_dto_cycles) << 16;
+			active_data_hctl += hsync_start_x;
+
+			display_data_hctl = active_data_hctl;
+		}
+	}
 
 	den_polarity = 0;
 	if (ctx->cap->type == INTF_HDMI) {
diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_intf.h b/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_intf.h
index e4a518a..8fc71ce 100644
--- a/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_intf.h
+++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_intf.h
@@ -32,6 +32,9 @@ struct intf_timing_params {
 	u32 hsync_skew;
 
 	bool wide_bus_en;
+	bool compression_en;
+	u32 extra_dto_cycles;   /* for DP only */
+	u32 dce_bytes_per_line;
 };
 
 struct intf_prog_fetch {
-- 
The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum,
a Linux Foundation Collaborative Project

Re: [PATCH v3 2/3] drm/msm/dp: revise timing engine programming to support compression (DSC)

[Dmitry Baryshkov]

On 04/02/2022 21:36, Kuogee Hsieh wrote:
> Divides horizontal width by 3 at timing engine of interface. There are
> major part of  compression (DSC) programming have to be done at DSC
> controller which is not covered by this patch.
> 
> Signed-off-by: Kuogee Hsieh <quic_khsieh@quicinc.com>
> ---
>   drivers/gpu/drm/msm/disp/dpu1/dpu_hw_intf.c | 22 ++++++++++++++++++----
>   drivers/gpu/drm/msm/disp/dpu1/dpu_hw_intf.h |  3 +++
>   2 files changed, 21 insertions(+), 4 deletions(-)
> 
> diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_intf.c b/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_intf.c
> index 35d4aaa..ee7ca34 100644
> --- a/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_intf.c
> +++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_intf.c
> @@ -128,7 +128,7 @@ static void dpu_hw_intf_setup_timing_engine(struct dpu_hw_intf *ctx,
>   	 * video timing. It is recommended to enable it for all cases, except
>   	 * if compression is enabled in 1 pixel per clock mode
>   	 */
> -	if (p->wide_bus_en)
> +	if (!p->compression_en || p->wide_bus_en)
>   		intf_cfg2 |= BIT(4);

So, what exactly is BIT(4)? Is it WIDE_BUS_ENABLE of some kind? Then why 
do you disable it for compression_en?

Please, add defines for all the respective BIT(n) values.

>   
>   	if (p->wide_bus_en)
> @@ -150,10 +150,16 @@ static void dpu_hw_intf_setup_timing_engine(struct dpu_hw_intf *ctx,
>   	 */
>   	data_width = p->width;
>   
> -	if (!dp_intf && p->wide_bus_en)
> +	if (p->compression_en) {
> +		data_width = DIV_ROUND_UP(p->dce_bytes_per_line, 3);
> +
> +		if (p->wide_bus_en)
> +			data_width >>= 1;
> +	} else if (!dp_intf && p->wide_bus_en) {
>   		data_width = p->width >> 1;
> -	else
> +	} else {
>   		data_width = p->width;
> +	}
>   
>   	hsync_data_start_x = hsync_start_x;
>   	hsync_data_end_x =  hsync_start_x + data_width - 1;
> @@ -178,8 +184,16 @@ static void dpu_hw_intf_setup_timing_engine(struct dpu_hw_intf *ctx,
>   
>   	active_hctl = (active_h_end << 16) | active_h_start;
>   
> -	if (dp_intf)
> +	if (dp_intf) {
>   		display_hctl = active_hctl;
> +		if (p->compression_en) {
> +			active_data_hctl = (hsync_start_x +
> +					p->extra_dto_cycles) << 16;
> +			active_data_hctl += hsync_start_x;
> +
> +			display_data_hctl = active_data_hctl;
> +		}
> +	}
>   
>   	den_polarity = 0;
>   	if (ctx->cap->type == INTF_HDMI) {
> diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_intf.h b/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_intf.h
> index e4a518a..8fc71ce 100644
> --- a/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_intf.h
> +++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_intf.h
> @@ -32,6 +32,9 @@ struct intf_timing_params {
>   	u32 hsync_skew;
>   
>   	bool wide_bus_en;
> +	bool compression_en;
> +	u32 extra_dto_cycles;   /* for DP only */
> +	u32 dce_bytes_per_line;
>   };
>   
>   struct intf_prog_fetch {


-- 
With best wishes
Dmitry

[PATCH v3 3/3] drm/msm/dp: enable widebus feature for display port

[Kuogee Hsieh]

Widebus feature will transmit two pixel data per pixel clock to interface.
This feature now is required to be enabled to easy migrant to higher
resolution applications in future. However since some legacy chipsets
does not support this feature, this feature is enabled base on chip's
hardware revision.

changes in v2:
-- remove compression related code from timing
-- remove op_info from  struct msm_drm_private
-- remove unnecessary wide_bus_en variables
-- pass wide_bus_en into timing configuration by struct msm_dp

Changes in v3:
-- split patch into 3 patches
-- enable widebus feature base on chip hardware revision

Signed-off-by: Kuogee Hsieh <quic_khsieh@quicinc.com>
---
 drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c |  4 +++-
 drivers/gpu/drm/msm/dp/dp_catalog.c         | 36 +++++++++++++++++++++++++++--
 drivers/gpu/drm/msm/dp/dp_catalog.h         |  3 ++-
 drivers/gpu/drm/msm/dp/dp_ctrl.c            | 13 +++++++----
 drivers/gpu/drm/msm/dp/dp_ctrl.h            |  1 +
 drivers/gpu/drm/msm/dp/dp_display.c         | 30 ++++++++++++++++++++++++
 drivers/gpu/drm/msm/dp/dp_display.h         |  2 ++
 drivers/gpu/drm/msm/dp/dp_panel.c           |  4 ++--
 drivers/gpu/drm/msm/dp/dp_panel.h           |  2 +-
 drivers/gpu/drm/msm/msm_drv.h               |  6 +++++
 10 files changed, 90 insertions(+), 11 deletions(-)

diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c b/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c
index 0c22839..b2d23c2 100644
--- a/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c
+++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c
@@ -2167,8 +2167,10 @@ int dpu_encoder_setup(struct drm_device *dev, struct drm_encoder *enc,
 		timer_setup(&dpu_enc->vsync_event_timer,
 				dpu_encoder_vsync_event_handler,
 				0);
-	else if (disp_info->intf_type == DRM_MODE_ENCODER_TMDS)
+	else if (disp_info->intf_type == DRM_MODE_ENCODER_TMDS) {
 		dpu_enc->dp = priv->dp[disp_info->h_tile_instance[0]];
+		dpu_enc->wide_bus_en = msm_dp_wide_bus_enable(dpu_enc->dp);
+	}
 
 	INIT_DELAYED_WORK(&dpu_enc->delayed_off_work,
 			dpu_encoder_off_work);
diff --git a/drivers/gpu/drm/msm/dp/dp_catalog.c b/drivers/gpu/drm/msm/dp/dp_catalog.c
index 64f0b26..99d087e 100644
--- a/drivers/gpu/drm/msm/dp/dp_catalog.c
+++ b/drivers/gpu/drm/msm/dp/dp_catalog.c
@@ -483,6 +483,27 @@ int dp_catalog_ctrl_set_pattern_state_bit(struct dp_catalog *dp_catalog,
 }
 
 /**
+ * dp_catalog_hw_revision() - retrieve DP hw revision
+ *
+ * @dp_catalog: DP catalog structure
+ *
+ * return: u32
+ *
+ * This function return the DP controller hw revision
+ *
+ */
+u32 dp_catalog_hw_revision(struct dp_catalog *dp_catalog)
+{
+	u32 revision;
+	struct dp_catalog_private *catalog = container_of(dp_catalog,
+				struct dp_catalog_private, dp_catalog);
+
+	revision = dp_read_ahb(catalog, REG_DP_HW_VERSION);
+
+	return revision;
+}
+
+/**
  * dp_catalog_ctrl_reset() - reset DP controller
  *
  * @dp_catalog: DP catalog structure
@@ -739,10 +760,11 @@ u32 dp_catalog_ctrl_read_phy_pattern(struct dp_catalog *dp_catalog)
 }
 
 /* panel related catalog functions */
-int dp_catalog_panel_timing_cfg(struct dp_catalog *dp_catalog)
+int dp_catalog_panel_timing_cfg(struct dp_catalog *dp_catalog, bool wide_bus_en)
 {
 	struct dp_catalog_private *catalog = container_of(dp_catalog,
 				struct dp_catalog_private, dp_catalog);
+	u32 reg;
 
 	dp_write_link(catalog, REG_DP_TOTAL_HOR_VER,
 				dp_catalog->total);
@@ -751,7 +773,17 @@ int dp_catalog_panel_timing_cfg(struct dp_catalog *dp_catalog)
 	dp_write_link(catalog, REG_DP_HSYNC_VSYNC_WIDTH_POLARITY,
 				dp_catalog->width_blanking);
 	dp_write_link(catalog, REG_DP_ACTIVE_HOR_VER, dp_catalog->dp_active);
-	dp_write_p0(catalog, MMSS_DP_INTF_CONFIG, 0);
+
+	reg = dp_read_p0(catalog, MMSS_DP_INTF_CONFIG);
+
+	if (wide_bus_en)
+		reg |= BIT(4);	/* DATABUS_WIDEN */
+	else
+		reg &= ~BIT(4);
+
+	DRM_DEBUG_DP("wide_bus_en=%d reg=%x\n", wide_bus_en, reg);
+
+	dp_write_p0(catalog, MMSS_DP_INTF_CONFIG, reg);
 	return 0;
 }
 
diff --git a/drivers/gpu/drm/msm/dp/dp_catalog.h b/drivers/gpu/drm/msm/dp/dp_catalog.h
index 7dea101..a3a0129 100644
--- a/drivers/gpu/drm/msm/dp/dp_catalog.h
+++ b/drivers/gpu/drm/msm/dp/dp_catalog.h
@@ -95,6 +95,7 @@ void dp_catalog_ctrl_config_misc(struct dp_catalog *dp_catalog, u32 cc, u32 tb);
 void dp_catalog_ctrl_config_msa(struct dp_catalog *dp_catalog, u32 rate,
 				u32 stream_rate_khz, bool fixed_nvid);
 int dp_catalog_ctrl_set_pattern_state_bit(struct dp_catalog *dp_catalog, u32 pattern);
+u32 dp_catalog_hw_revision(struct dp_catalog *dp_catalog);
 void dp_catalog_ctrl_reset(struct dp_catalog *dp_catalog);
 bool dp_catalog_ctrl_mainlink_ready(struct dp_catalog *dp_catalog);
 void dp_catalog_ctrl_enable_irq(struct dp_catalog *dp_catalog, bool enable);
@@ -115,7 +116,7 @@ void dp_catalog_ctrl_send_phy_pattern(struct dp_catalog *dp_catalog,
 u32 dp_catalog_ctrl_read_phy_pattern(struct dp_catalog *dp_catalog);
 
 /* DP Panel APIs */
-int dp_catalog_panel_timing_cfg(struct dp_catalog *dp_catalog);
+int dp_catalog_panel_timing_cfg(struct dp_catalog *dp_catalog, bool wide_bus_en);
 void dp_catalog_dump_regs(struct dp_catalog *dp_catalog);
 void dp_catalog_panel_tpg_enable(struct dp_catalog *dp_catalog,
 				struct drm_display_mode *drm_mode);
diff --git a/drivers/gpu/drm/msm/dp/dp_ctrl.c b/drivers/gpu/drm/msm/dp/dp_ctrl.c
index 245e1b9..1c4cf9d 100644
--- a/drivers/gpu/drm/msm/dp/dp_ctrl.c
+++ b/drivers/gpu/drm/msm/dp/dp_ctrl.c
@@ -154,7 +154,7 @@ static void dp_ctrl_config_ctrl(struct dp_ctrl_private *ctrl)
 	dp_catalog_ctrl_config_ctrl(ctrl->catalog, config);
 }
 
-static void dp_ctrl_configure_source_params(struct dp_ctrl_private *ctrl)
+static void dp_ctrl_configure_source_params(struct dp_ctrl_private *ctrl, bool wide_bus_en)
 {
 	u32 cc, tb;
 
@@ -167,7 +167,7 @@ static void dp_ctrl_configure_source_params(struct dp_ctrl_private *ctrl)
 		ctrl->panel->dp_mode.bpp);
 	cc = dp_link_get_colorimetry_config(ctrl->link);
 	dp_catalog_ctrl_config_misc(ctrl->catalog, cc, tb);
-	dp_panel_timing_cfg(ctrl->panel);
+	dp_panel_timing_cfg(ctrl->panel, wide_bus_en);
 }
 
 /*
@@ -1796,6 +1796,7 @@ int dp_ctrl_on_stream(struct dp_ctrl *dp_ctrl)
 	int ret = 0;
 	bool mainlink_ready = false;
 	struct dp_ctrl_private *ctrl;
+	u32 pixel_rate_orig;
 
 	if (!dp_ctrl)
 		return -EINVAL;
@@ -1804,6 +1805,10 @@ int dp_ctrl_on_stream(struct dp_ctrl *dp_ctrl)
 
 	ctrl->dp_ctrl.pixel_rate = ctrl->panel->dp_mode.drm_mode.clock;
 
+	pixel_rate_orig = ctrl->dp_ctrl.pixel_rate;
+	if (dp_ctrl->wide_bus_en)
+		ctrl->dp_ctrl.pixel_rate >>= 1;
+
 	DRM_DEBUG_DP("rate=%d, num_lanes=%d, pixel_rate=%d\n",
 		ctrl->link->link_params.rate,
 		ctrl->link->link_params.num_lanes, ctrl->dp_ctrl.pixel_rate);
@@ -1839,11 +1844,11 @@ int dp_ctrl_on_stream(struct dp_ctrl *dp_ctrl)
 	 */
 	reinit_completion(&ctrl->video_comp);
 
-	dp_ctrl_configure_source_params(ctrl);
+	dp_ctrl_configure_source_params(ctrl, dp_ctrl->wide_bus_en);
 
 	dp_catalog_ctrl_config_msa(ctrl->catalog,
 		ctrl->link->link_params.rate,
-		ctrl->dp_ctrl.pixel_rate, dp_ctrl_use_fixed_nvid(ctrl));
+		pixel_rate_orig, dp_ctrl_use_fixed_nvid(ctrl));
 
 	dp_ctrl_setup_tr_unit(ctrl);
 
diff --git a/drivers/gpu/drm/msm/dp/dp_ctrl.h b/drivers/gpu/drm/msm/dp/dp_ctrl.h
index 2433edb..4dff44d 100644
--- a/drivers/gpu/drm/msm/dp/dp_ctrl.h
+++ b/drivers/gpu/drm/msm/dp/dp_ctrl.h
@@ -17,6 +17,7 @@ struct dp_ctrl {
 	bool orientation;
 	atomic_t aborted;
 	u32 pixel_rate;
+	bool wide_bus_en;
 };
 
 int dp_ctrl_on_link(struct dp_ctrl *dp_ctrl);
diff --git a/drivers/gpu/drm/msm/dp/dp_display.c b/drivers/gpu/drm/msm/dp/dp_display.c
index e89556ad..d45a3aa 100644
--- a/drivers/gpu/drm/msm/dp/dp_display.c
+++ b/drivers/gpu/drm/msm/dp/dp_display.c
@@ -117,6 +117,8 @@ struct dp_display_private {
 	struct dp_event event_list[DP_EVENT_Q_MAX];
 	spinlock_t event_lock;
 
+	bool wide_bus_en;
+
 	struct dp_audio *audio;
 };
 
@@ -845,6 +847,8 @@ static int dp_display_enable(struct dp_display_private *dp, u32 data)
 		return 0;
 	}
 
+	dp->ctrl->wide_bus_en = dp->wide_bus_en;
+
 	rc = dp_ctrl_on_stream(dp->ctrl);
 	if (!rc)
 		dp_display->power_on = true;
@@ -979,6 +983,7 @@ int dp_display_get_modes(struct msm_dp *dp,
 		dp->connector, dp_mode);
 	if (dp_mode->drm_mode.clock)
 		dp->max_pclk_khz = dp_mode->drm_mode.clock;
+
 	return ret;
 }
 
@@ -1451,6 +1456,28 @@ void msm_dp_irq_postinstall(struct msm_dp *dp_display)
 	}
 }
 
+bool msm_dp_wide_bus_enable(struct msm_dp *dp_display)
+{
+	struct dp_display_private *dp;
+	u32 revision, major, minor;
+
+	dp = container_of(dp_display, struct dp_display_private, dp_display);
+
+	/* for the time being widebus only support on DP */
+	if (dp_display->connector_type  == DRM_MODE_CONNECTOR_DisplayPort) {
+		revision = dp_catalog_hw_revision(dp->catalog);
+		major = ((revision >> 28) & 0x0ff);
+		minor = ((revision >> 16) & 0x0fff);
+
+	DRM_DEBUG_DP("id=%d major=%d minor=%d\n", dp->id, major, minor);
+
+		if (major >= 1 && minor >= 2)
+			return true;
+	}
+
+	return false;
+}
+
 void msm_dp_debugfs_init(struct msm_dp *dp_display, struct drm_minor *minor)
 {
 	struct dp_display_private *dp;
@@ -1505,6 +1532,9 @@ int msm_dp_modeset_init(struct msm_dp *dp_display, struct drm_device *dev,
 	dp_priv->panel->connector = dp_display->connector;
 
 	priv->connectors[priv->num_connectors++] = dp_display->connector;
+
+	dp_priv->wide_bus_en = msm_dp_wide_bus_enable(dp_display);
+
 	return 0;
 }
 
diff --git a/drivers/gpu/drm/msm/dp/dp_display.h b/drivers/gpu/drm/msm/dp/dp_display.h
index 8e80e3b..d9cb9ee 100644
--- a/drivers/gpu/drm/msm/dp/dp_display.h
+++ b/drivers/gpu/drm/msm/dp/dp_display.h
@@ -23,6 +23,8 @@ struct msm_dp {
 
 	hdmi_codec_plugged_cb plugged_cb;
 
+	bool wide_bus_en;
+
 	u32 max_pclk_khz;
 
 	u32 max_dp_lanes;
diff --git a/drivers/gpu/drm/msm/dp/dp_panel.c b/drivers/gpu/drm/msm/dp/dp_panel.c
index 71db10c..71deb1e 100644
--- a/drivers/gpu/drm/msm/dp/dp_panel.c
+++ b/drivers/gpu/drm/msm/dp/dp_panel.c
@@ -353,7 +353,7 @@ void dp_panel_dump_regs(struct dp_panel *dp_panel)
 	dp_catalog_dump_regs(catalog);
 }
 
-int dp_panel_timing_cfg(struct dp_panel *dp_panel)
+int dp_panel_timing_cfg(struct dp_panel *dp_panel, bool wide_bus_en)
 {
 	u32 data, total_ver, total_hor;
 	struct dp_catalog *catalog;
@@ -404,7 +404,7 @@ int dp_panel_timing_cfg(struct dp_panel *dp_panel)
 
 	catalog->dp_active = data;
 
-	dp_catalog_panel_timing_cfg(catalog);
+	dp_catalog_panel_timing_cfg(catalog, wide_bus_en);
 	panel->panel_on = true;
 
 	return 0;
diff --git a/drivers/gpu/drm/msm/dp/dp_panel.h b/drivers/gpu/drm/msm/dp/dp_panel.h
index 9023e5b..5ec341a 100644
--- a/drivers/gpu/drm/msm/dp/dp_panel.h
+++ b/drivers/gpu/drm/msm/dp/dp_panel.h
@@ -57,7 +57,7 @@ struct dp_panel {
 
 int dp_panel_init_panel_info(struct dp_panel *dp_panel);
 int dp_panel_deinit(struct dp_panel *dp_panel);
-int dp_panel_timing_cfg(struct dp_panel *dp_panel);
+int dp_panel_timing_cfg(struct dp_panel *dp_panel, bool wide_bus_en);
 void dp_panel_dump_regs(struct dp_panel *dp_panel);
 int dp_panel_read_sink_caps(struct dp_panel *dp_panel,
 		struct drm_connector *connector);
diff --git a/drivers/gpu/drm/msm/msm_drv.h b/drivers/gpu/drm/msm/msm_drv.h
index 07f6c41..667f3a8 100644
--- a/drivers/gpu/drm/msm/msm_drv.h
+++ b/drivers/gpu/drm/msm/msm_drv.h
@@ -398,6 +398,7 @@ void msm_dp_irq_postinstall(struct msm_dp *dp_display);
 void msm_dp_snapshot(struct msm_disp_state *disp_state, struct msm_dp *dp_display);
 
 void msm_dp_debugfs_init(struct msm_dp *dp_display, struct drm_minor *minor);
+bool msm_dp_wide_bus_enable(struct msm_dp *dp_display);
 
 #else
 static inline int __init msm_dp_register(void)
@@ -448,6 +449,11 @@ static inline void msm_dp_debugfs_init(struct msm_dp *dp_display,
 {
 }
 
+bool msm_dp_wide_bus_enable(struct msm_dp *dp_display)
+{
+	return false;
+}
+
 #endif
 
 void __init msm_mdp_register(void);
-- 
The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum,
a Linux Foundation Collaborative Project

Re: [PATCH v3 3/3] drm/msm/dp: enable widebus feature for display port

[Dmitry Baryshkov]

On 04/02/2022 21:36, Kuogee Hsieh wrote:
> Widebus feature will transmit two pixel data per pixel clock to interface.
> This feature now is required to be enabled to easy migrant to higher
> resolution applications in future. However since some legacy chipsets
> does not support this feature, this feature is enabled base on chip's
> hardware revision.
> 
> changes in v2:
> -- remove compression related code from timing
> -- remove op_info from  struct msm_drm_private
> -- remove unnecessary wide_bus_en variables
> -- pass wide_bus_en into timing configuration by struct msm_dp
> 
> Changes in v3:
> -- split patch into 3 patches
> -- enable widebus feature base on chip hardware revision
> 
> Signed-off-by: Kuogee Hsieh <quic_khsieh@quicinc.com>
> ---
>   drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c |  4 +++-
>   drivers/gpu/drm/msm/dp/dp_catalog.c         | 36 +++++++++++++++++++++++++++--
>   drivers/gpu/drm/msm/dp/dp_catalog.h         |  3 ++-
>   drivers/gpu/drm/msm/dp/dp_ctrl.c            | 13 +++++++----
>   drivers/gpu/drm/msm/dp/dp_ctrl.h            |  1 +
>   drivers/gpu/drm/msm/dp/dp_display.c         | 30 ++++++++++++++++++++++++
>   drivers/gpu/drm/msm/dp/dp_display.h         |  2 ++
>   drivers/gpu/drm/msm/dp/dp_panel.c           |  4 ++--
>   drivers/gpu/drm/msm/dp/dp_panel.h           |  2 +-
>   drivers/gpu/drm/msm/msm_drv.h               |  6 +++++
>   10 files changed, 90 insertions(+), 11 deletions(-)
> 
> diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c b/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c
> index 0c22839..b2d23c2 100644
> --- a/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c
> +++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c
> @@ -2167,8 +2167,10 @@ int dpu_encoder_setup(struct drm_device *dev, struct drm_encoder *enc,
>   		timer_setup(&dpu_enc->vsync_event_timer,
>   				dpu_encoder_vsync_event_handler,
>   				0);
> -	else if (disp_info->intf_type == DRM_MODE_ENCODER_TMDS)
> +	else if (disp_info->intf_type == DRM_MODE_ENCODER_TMDS) {
>   		dpu_enc->dp = priv->dp[disp_info->h_tile_instance[0]];
> +		dpu_enc->wide_bus_en = msm_dp_wide_bus_enable(dpu_enc->dp);
> +	}
>   
>   	INIT_DELAYED_WORK(&dpu_enc->delayed_off_work,
>   			dpu_encoder_off_work);

If this patch is moved to #1, this hunk can go into the respective DPU 
patch. Could you please change the order?

> diff --git a/drivers/gpu/drm/msm/dp/dp_catalog.c b/drivers/gpu/drm/msm/dp/dp_catalog.c
> index 64f0b26..99d087e 100644
> --- a/drivers/gpu/drm/msm/dp/dp_catalog.c
> +++ b/drivers/gpu/drm/msm/dp/dp_catalog.c
> @@ -483,6 +483,27 @@ int dp_catalog_ctrl_set_pattern_state_bit(struct dp_catalog *dp_catalog,
>   }
>   
>   /**
> + * dp_catalog_hw_revision() - retrieve DP hw revision
> + *
> + * @dp_catalog: DP catalog structure
> + *
> + * return: u32
> + *
> + * This function return the DP controller hw revision
> + *
> + */
> +u32 dp_catalog_hw_revision(struct dp_catalog *dp_catalog)
> +{
> +	u32 revision;
> +	struct dp_catalog_private *catalog = container_of(dp_catalog,
> +				struct dp_catalog_private, dp_catalog);
> +
> +	revision = dp_read_ahb(catalog, REG_DP_HW_VERSION);
> +
> +	return revision;
> +}
> +
> +/**
>    * dp_catalog_ctrl_reset() - reset DP controller
>    *
>    * @dp_catalog: DP catalog structure
> @@ -739,10 +760,11 @@ u32 dp_catalog_ctrl_read_phy_pattern(struct dp_catalog *dp_catalog)
>   }
>   
>   /* panel related catalog functions */
> -int dp_catalog_panel_timing_cfg(struct dp_catalog *dp_catalog)
> +int dp_catalog_panel_timing_cfg(struct dp_catalog *dp_catalog, bool wide_bus_en)
>   {
>   	struct dp_catalog_private *catalog = container_of(dp_catalog,
>   				struct dp_catalog_private, dp_catalog);
> +	u32 reg;
>   
>   	dp_write_link(catalog, REG_DP_TOTAL_HOR_VER,
>   				dp_catalog->total);
> @@ -751,7 +773,17 @@ int dp_catalog_panel_timing_cfg(struct dp_catalog *dp_catalog)
>   	dp_write_link(catalog, REG_DP_HSYNC_VSYNC_WIDTH_POLARITY,
>   				dp_catalog->width_blanking);
>   	dp_write_link(catalog, REG_DP_ACTIVE_HOR_VER, dp_catalog->dp_active);
> -	dp_write_p0(catalog, MMSS_DP_INTF_CONFIG, 0);
> +
> +	reg = dp_read_p0(catalog, MMSS_DP_INTF_CONFIG);
> +
> +	if (wide_bus_en)
> +		reg |= BIT(4);	/* DATABUS_WIDEN */
> +	else
> +		reg &= ~BIT(4);
> +
> +	DRM_DEBUG_DP("wide_bus_en=%d reg=%x\n", wide_bus_en, reg);
> +
> +	dp_write_p0(catalog, MMSS_DP_INTF_CONFIG, reg);
>   	return 0;
>   }
>   
> diff --git a/drivers/gpu/drm/msm/dp/dp_catalog.h b/drivers/gpu/drm/msm/dp/dp_catalog.h
> index 7dea101..a3a0129 100644
> --- a/drivers/gpu/drm/msm/dp/dp_catalog.h
> +++ b/drivers/gpu/drm/msm/dp/dp_catalog.h
> @@ -95,6 +95,7 @@ void dp_catalog_ctrl_config_misc(struct dp_catalog *dp_catalog, u32 cc, u32 tb);
>   void dp_catalog_ctrl_config_msa(struct dp_catalog *dp_catalog, u32 rate,
>   				u32 stream_rate_khz, bool fixed_nvid);
>   int dp_catalog_ctrl_set_pattern_state_bit(struct dp_catalog *dp_catalog, u32 pattern);
> +u32 dp_catalog_hw_revision(struct dp_catalog *dp_catalog);
>   void dp_catalog_ctrl_reset(struct dp_catalog *dp_catalog);
>   bool dp_catalog_ctrl_mainlink_ready(struct dp_catalog *dp_catalog);
>   void dp_catalog_ctrl_enable_irq(struct dp_catalog *dp_catalog, bool enable);
> @@ -115,7 +116,7 @@ void dp_catalog_ctrl_send_phy_pattern(struct dp_catalog *dp_catalog,
>   u32 dp_catalog_ctrl_read_phy_pattern(struct dp_catalog *dp_catalog);
>   
>   /* DP Panel APIs */
> -int dp_catalog_panel_timing_cfg(struct dp_catalog *dp_catalog);
> +int dp_catalog_panel_timing_cfg(struct dp_catalog *dp_catalog, bool wide_bus_en);
>   void dp_catalog_dump_regs(struct dp_catalog *dp_catalog);
>   void dp_catalog_panel_tpg_enable(struct dp_catalog *dp_catalog,
>   				struct drm_display_mode *drm_mode);
> diff --git a/drivers/gpu/drm/msm/dp/dp_ctrl.c b/drivers/gpu/drm/msm/dp/dp_ctrl.c
> index 245e1b9..1c4cf9d 100644
> --- a/drivers/gpu/drm/msm/dp/dp_ctrl.c
> +++ b/drivers/gpu/drm/msm/dp/dp_ctrl.c
> @@ -154,7 +154,7 @@ static void dp_ctrl_config_ctrl(struct dp_ctrl_private *ctrl)
>   	dp_catalog_ctrl_config_ctrl(ctrl->catalog, config);
>   }
>   
> -static void dp_ctrl_configure_source_params(struct dp_ctrl_private *ctrl)
> +static void dp_ctrl_configure_source_params(struct dp_ctrl_private *ctrl, bool wide_bus_en)
>   {
>   	u32 cc, tb;
>   
> @@ -167,7 +167,7 @@ static void dp_ctrl_configure_source_params(struct dp_ctrl_private *ctrl)
>   		ctrl->panel->dp_mode.bpp);
>   	cc = dp_link_get_colorimetry_config(ctrl->link);
>   	dp_catalog_ctrl_config_misc(ctrl->catalog, cc, tb);
> -	dp_panel_timing_cfg(ctrl->panel);
> +	dp_panel_timing_cfg(ctrl->panel, wide_bus_en);
>   }
>   
>   /*
> @@ -1796,6 +1796,7 @@ int dp_ctrl_on_stream(struct dp_ctrl *dp_ctrl)
>   	int ret = 0;
>   	bool mainlink_ready = false;
>   	struct dp_ctrl_private *ctrl;
> +	u32 pixel_rate_orig;
>   
>   	if (!dp_ctrl)
>   		return -EINVAL;
> @@ -1804,6 +1805,10 @@ int dp_ctrl_on_stream(struct dp_ctrl *dp_ctrl)
>   
>   	ctrl->dp_ctrl.pixel_rate = ctrl->panel->dp_mode.drm_mode.clock;
>   
> +	pixel_rate_orig = ctrl->dp_ctrl.pixel_rate;
> +	if (dp_ctrl->wide_bus_en)
> +		ctrl->dp_ctrl.pixel_rate >>= 1;
> +
>   	DRM_DEBUG_DP("rate=%d, num_lanes=%d, pixel_rate=%d\n",
>   		ctrl->link->link_params.rate,
>   		ctrl->link->link_params.num_lanes, ctrl->dp_ctrl.pixel_rate);
> @@ -1839,11 +1844,11 @@ int dp_ctrl_on_stream(struct dp_ctrl *dp_ctrl)
>   	 */
>   	reinit_completion(&ctrl->video_comp);
>   
> -	dp_ctrl_configure_source_params(ctrl);
> +	dp_ctrl_configure_source_params(ctrl, dp_ctrl->wide_bus_en);
>   
>   	dp_catalog_ctrl_config_msa(ctrl->catalog,
>   		ctrl->link->link_params.rate,
> -		ctrl->dp_ctrl.pixel_rate, dp_ctrl_use_fixed_nvid(ctrl));
> +		pixel_rate_orig, dp_ctrl_use_fixed_nvid(ctrl));
>   
>   	dp_ctrl_setup_tr_unit(ctrl);
>   
> diff --git a/drivers/gpu/drm/msm/dp/dp_ctrl.h b/drivers/gpu/drm/msm/dp/dp_ctrl.h
> index 2433edb..4dff44d 100644
> --- a/drivers/gpu/drm/msm/dp/dp_ctrl.h
> +++ b/drivers/gpu/drm/msm/dp/dp_ctrl.h
> @@ -17,6 +17,7 @@ struct dp_ctrl {
>   	bool orientation;
>   	atomic_t aborted;
>   	u32 pixel_rate;
> +	bool wide_bus_en;
>   };
>   
>   int dp_ctrl_on_link(struct dp_ctrl *dp_ctrl);
> diff --git a/drivers/gpu/drm/msm/dp/dp_display.c b/drivers/gpu/drm/msm/dp/dp_display.c
> index e89556ad..d45a3aa 100644
> --- a/drivers/gpu/drm/msm/dp/dp_display.c
> +++ b/drivers/gpu/drm/msm/dp/dp_display.c
> @@ -117,6 +117,8 @@ struct dp_display_private {
>   	struct dp_event event_list[DP_EVENT_Q_MAX];
>   	spinlock_t event_lock;
>   
> +	bool wide_bus_en;
> +
>   	struct dp_audio *audio;
>   };
>   
> @@ -845,6 +847,8 @@ static int dp_display_enable(struct dp_display_private *dp, u32 data)
>   		return 0;
>   	}
>   
> +	dp->ctrl->wide_bus_en = dp->wide_bus_en;
> +
>   	rc = dp_ctrl_on_stream(dp->ctrl);
>   	if (!rc)
>   		dp_display->power_on = true;
> @@ -979,6 +983,7 @@ int dp_display_get_modes(struct msm_dp *dp,
>   		dp->connector, dp_mode);
>   	if (dp_mode->drm_mode.clock)
>   		dp->max_pclk_khz = dp_mode->drm_mode.clock;
> +
>   	return ret;
>   }
>   
> @@ -1451,6 +1456,28 @@ void msm_dp_irq_postinstall(struct msm_dp *dp_display)
>   	}
>   }
>   
> +bool msm_dp_wide_bus_enable(struct msm_dp *dp_display)
> +{
> +	struct dp_display_private *dp;
> +	u32 revision, major, minor;
> +
> +	dp = container_of(dp_display, struct dp_display_private, dp_display);
> +
> +	/* for the time being widebus only support on DP */
> +	if (dp_display->connector_type  == DRM_MODE_CONNECTOR_DisplayPort) {
> +		revision = dp_catalog_hw_revision(dp->catalog);
> +		major = ((revision >> 28) & 0x0ff);
> +		minor = ((revision >> 16) & 0x0fff);
> +
> +	DRM_DEBUG_DP("id=%d major=%d minor=%d\n", dp->id, major, minor);
> +
> +		if (major >= 1 && minor >= 2)
> +			return true;
> +	}
> +
> +	return false;
> +}
> +
>   void msm_dp_debugfs_init(struct msm_dp *dp_display, struct drm_minor *minor)
>   {
>   	struct dp_display_private *dp;
> @@ -1505,6 +1532,9 @@ int msm_dp_modeset_init(struct msm_dp *dp_display, struct drm_device *dev,
>   	dp_priv->panel->connector = dp_display->connector;
>   
>   	priv->connectors[priv->num_connectors++] = dp_display->connector;
> +
> +	dp_priv->wide_bus_en = msm_dp_wide_bus_enable(dp_display);
> +
>   	return 0;
>   }
>   
> diff --git a/drivers/gpu/drm/msm/dp/dp_display.h b/drivers/gpu/drm/msm/dp/dp_display.h
> index 8e80e3b..d9cb9ee 100644
> --- a/drivers/gpu/drm/msm/dp/dp_display.h
> +++ b/drivers/gpu/drm/msm/dp/dp_display.h
> @@ -23,6 +23,8 @@ struct msm_dp {
>   
>   	hdmi_codec_plugged_cb plugged_cb;
>   
> +	bool wide_bus_en;
> +
>   	u32 max_pclk_khz;
>   
>   	u32 max_dp_lanes;
> diff --git a/drivers/gpu/drm/msm/dp/dp_panel.c b/drivers/gpu/drm/msm/dp/dp_panel.c
> index 71db10c..71deb1e 100644
> --- a/drivers/gpu/drm/msm/dp/dp_panel.c
> +++ b/drivers/gpu/drm/msm/dp/dp_panel.c
> @@ -353,7 +353,7 @@ void dp_panel_dump_regs(struct dp_panel *dp_panel)
>   	dp_catalog_dump_regs(catalog);
>   }
>   
> -int dp_panel_timing_cfg(struct dp_panel *dp_panel)
> +int dp_panel_timing_cfg(struct dp_panel *dp_panel, bool wide_bus_en)
>   {
>   	u32 data, total_ver, total_hor;
>   	struct dp_catalog *catalog;
> @@ -404,7 +404,7 @@ int dp_panel_timing_cfg(struct dp_panel *dp_panel)
>   
>   	catalog->dp_active = data;
>   
> -	dp_catalog_panel_timing_cfg(catalog);
> +	dp_catalog_panel_timing_cfg(catalog, wide_bus_en);
>   	panel->panel_on = true;
>   
>   	return 0;
> diff --git a/drivers/gpu/drm/msm/dp/dp_panel.h b/drivers/gpu/drm/msm/dp/dp_panel.h
> index 9023e5b..5ec341a 100644
> --- a/drivers/gpu/drm/msm/dp/dp_panel.h
> +++ b/drivers/gpu/drm/msm/dp/dp_panel.h
> @@ -57,7 +57,7 @@ struct dp_panel {
>   
>   int dp_panel_init_panel_info(struct dp_panel *dp_panel);
>   int dp_panel_deinit(struct dp_panel *dp_panel);
> -int dp_panel_timing_cfg(struct dp_panel *dp_panel);
> +int dp_panel_timing_cfg(struct dp_panel *dp_panel, bool wide_bus_en);
>   void dp_panel_dump_regs(struct dp_panel *dp_panel);
>   int dp_panel_read_sink_caps(struct dp_panel *dp_panel,
>   		struct drm_connector *connector);
> diff --git a/drivers/gpu/drm/msm/msm_drv.h b/drivers/gpu/drm/msm/msm_drv.h
> index 07f6c41..667f3a8 100644
> --- a/drivers/gpu/drm/msm/msm_drv.h
> +++ b/drivers/gpu/drm/msm/msm_drv.h
> @@ -398,6 +398,7 @@ void msm_dp_irq_postinstall(struct msm_dp *dp_display);
>   void msm_dp_snapshot(struct msm_disp_state *disp_state, struct msm_dp *dp_display);
>   
>   void msm_dp_debugfs_init(struct msm_dp *dp_display, struct drm_minor *minor);
> +bool msm_dp_wide_bus_enable(struct msm_dp *dp_display);
>   
>   #else
>   static inline int __init msm_dp_register(void)
> @@ -448,6 +449,11 @@ static inline void msm_dp_debugfs_init(struct msm_dp *dp_display,
>   {
>   }
>   
> +bool msm_dp_wide_bus_enable(struct msm_dp *dp_display)

Generic comment:

msm_dp_wide_bus_enable is an order to dp to enable wide_bus.
The function should be renamed to msm_dp_is_wide_bus_enabled()

> +{
> +	return false;
> +}
> +
>   #endif
>   
>   void __init msm_mdp_register(void);


-- 
With best wishes
Dmitry