Re: [PATCH v5 1/6] drm/msm/dpu: fix video mode DSC for DSI

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On 5/27/2024 7:21 AM, Jun Nie wrote:
From: Jonathan Marek <jonathan@xxxxxxxx>

Add width change in DPU timing for DSC compression case to work with
DSI video mode.

Hi Jun,

LGTM

Reviewed-by: Jessica Zhang <quic_jesszhan@xxxxxxxxxxx>

Thanks,

Jessica Zhang


Signed-off-by: Jonathan Marek <jonathan@xxxxxxxx>
Signed-off-by: Jun Nie <jun.nie@xxxxxxxxxx>
---
  drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c          |  2 +-
  drivers/gpu/drm/msm/disp/dpu1/dpu_encoder_phys.h     |  8 ++++++++
  drivers/gpu/drm/msm/disp/dpu1/dpu_encoder_phys_vid.c | 18 ++++++++++++++++++
  3 files changed, 27 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c b/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c
index 119f3ea50a7c..48cef6e79c70 100644
--- a/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c
+++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c
@@ -564,7 +564,7 @@ bool dpu_encoder_use_dsc_merge(struct drm_encoder *drm_enc)
  	return (num_dsc > 0) && (num_dsc > intf_count);
  }
-static struct drm_dsc_config *dpu_encoder_get_dsc_config(struct drm_encoder *drm_enc)
+struct drm_dsc_config *dpu_encoder_get_dsc_config(struct drm_encoder *drm_enc)
  {
  	struct msm_drm_private *priv = drm_enc->dev->dev_private;
  	struct dpu_encoder_virt *dpu_enc = to_dpu_encoder_virt(drm_enc);
diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder_phys.h b/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder_phys.h
index 002e89cc1705..2167c46c1a45 100644
--- a/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder_phys.h
+++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder_phys.h
@@ -334,6 +334,14 @@ static inline enum dpu_3d_blend_mode dpu_encoder_helper_get_3d_blend_mode(
   */
  unsigned int dpu_encoder_helper_get_dsc(struct dpu_encoder_phys *phys_enc);
+/**
+ * dpu_encoder_get_dsc_config - get DSC config for the DPU encoder
+ *   This helper function is used by physical encoder to get DSC config
+ *   used for this encoder.
+ * @drm_enc: Pointer to encoder structure
+ */
+struct drm_dsc_config *dpu_encoder_get_dsc_config(struct drm_encoder *drm_enc);
+
  /**
   * dpu_encoder_get_drm_fmt - return DRM fourcc format
   * @phys_enc: Pointer to physical encoder structure
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 ef69c2f408c3..925ec6ada0e1 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
@@ -11,6 +11,7 @@
  #include "dpu_trace.h"
  #include "disp/msm_disp_snapshot.h"
+#include <drm/display/drm_dsc_helper.h>
  #include <drm/drm_managed.h>
#define DPU_DEBUG_VIDENC(e, fmt, ...) DPU_DEBUG("enc%d intf%d " fmt, \
@@ -115,6 +116,23 @@ static void drm_mode_to_intf_timing_params(
  		timing->h_front_porch = timing->h_front_porch >> 1;
  		timing->hsync_pulse_width = timing->hsync_pulse_width >> 1;
  	}
+
+	/*
+	 * for DSI, if compression is enabled, then divide the horizonal active
+	 * timing parameters by compression ratio. bits of 3 components(R/G/B)
+	 * is compressed into bits of 1 pixel.
+	 */
+	if (phys_enc->hw_intf->cap->type != INTF_DP && timing->compression_en) {
+		struct drm_dsc_config *dsc =
+		       dpu_encoder_get_dsc_config(phys_enc->parent);
+		/*
+		 * TODO: replace drm_dsc_get_bpp_int with logic to handle
+		 * fractional part if there is fraction
+		 */
+		timing->width = timing->width * drm_dsc_get_bpp_int(dsc) /
+				(dsc->bits_per_component * 3);
+		timing->xres = timing->width;
+	}
  }
static u32 get_horizontal_total(const struct dpu_hw_intf_timing_params *timing)

--
2.34.1





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