Re: [PATCH v6 6/8] drm/display/dsc: split DSC 1.2 and DSC 1.1 (pre-SCR) parameters

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On 17/05/2023 06:10, Kandpal, Suraj wrote:


The array of rc_parameters contains a mixture of parameters from DSC 1.1
and DSC 1.2 standards. Split these tow configuration arrays in preparation to
adding more configuration data.

Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@xxxxxxxxxx>
---
  drivers/gpu/drm/display/drm_dsc_helper.c  | 139 ++++++++++++++++++----
drivers/gpu/drm/i915/display/intel_vdsc.c |  10 +-
  include/drm/display/drm_dsc_helper.h      |   7 +-
  3 files changed, 129 insertions(+), 27 deletions(-)

diff --git a/drivers/gpu/drm/display/drm_dsc_helper.c
b/drivers/gpu/drm/display/drm_dsc_helper.c
index acb93d4116e0..f9d01d72c1ff 100644
--- a/drivers/gpu/drm/display/drm_dsc_helper.c
+++ b/drivers/gpu/drm/display/drm_dsc_helper.c
@@ -325,10 +325,88 @@ struct rc_parameters_data {
  #define DSC_BPP(bpp)	((bpp) << 4)

  /*
- * Selected Rate Control Related Parameter Recommended Values
- * from DSC_v1.11 spec & C Model release: DSC_model_20161212
+ * Rate Control Related Parameter Recommended Values from DSC_v1.1
spec
+ prior
+ * to DSC 1.1 fractional bpp underflow SCR (DSC_v1.1_E1.pdf)
+ *
+ * Cross-checked against C Model releases: DSC_model_20161212 and
+ 20210623
   */
-static const struct rc_parameters_data rc_parameters[] = {
+static const struct rc_parameters_data rc_parameters_pre_scr[] = {
+	{
+		.bpp = DSC_BPP(8), .bpc = 8,
+		{ 512, 12, 6144, 3, 12, 11, 11, {
+			{ 0, 4, 2 }, { 0, 4, 0 }, { 1, 5, 0 }, { 1, 6, -2 },
+			{ 3, 7, -4 }, { 3, 7, -6 }, { 3, 7, -8 }, { 3, 8, -8 },
+			{ 3, 9, -8 }, { 3, 10, -10 }, { 5, 11, -10 }, { 5, 12, -12 },
+			{ 5, 13, -12 }, { 7, 13, -12 }, { 13, 15, -12 }
+			}
+		}
+	},
+	{
+		.bpp = DSC_BPP(8), .bpc = 10,
+		{ 512, 12, 6144, 7, 16, 15, 15, {
+			/*
+			 * DSC model/pre-SCR-cfg has 8 for
range_max_qp[0], however
+			 * VESA DSC 1.1 Table E-5 sets it to 4.
+			 */
+			{ 0, 4, 2 }, { 4, 8, 0 }, { 5, 9, 0 }, { 5, 10, -2 },
+			{ 7, 11, -4 }, { 7, 11, -6 }, { 7, 11, -8 }, { 7, 12, -8 },
+			{ 7, 13, -8 }, { 7, 14, -10 }, { 9, 15, -10 }, { 9, 16, -12 },
+			{ 9, 17, -12 }, { 11, 17, -12 }, { 17, 19, -12 }
+			}
+		}
+	},
+	{
+		.bpp = DSC_BPP(8), .bpc = 12,
+		{ 512, 12, 6144, 11, 20, 19, 19, {
+			{ 0, 12, 2 }, { 4, 12, 0 }, { 9, 13, 0 }, { 9, 14, -2 },
+			{ 11, 15, -4 }, { 11, 15, -6 }, { 11, 15, -8 }, { 11, 16, -8 },
+			{ 11, 17, -8 }, { 11, 18, -10 }, { 13, 19, -10 },
+			{ 13, 20, -12 }, { 13, 21, -12 }, { 15, 21, -12 },
+			{ 21, 23, -12 }
+			}
+		}
+	},
+	{
+		.bpp = DSC_BPP(12), .bpc = 8,
+		{ 341, 15, 2048, 3, 12, 11, 11, {
+			{ 0, 2, 2 }, { 0, 4, 0 }, { 1, 5, 0 }, { 1, 6, -2 },
+			{ 3, 7, -4 }, { 3, 7, -6 }, { 3, 7, -8 }, { 3, 8, -8 },
+			{ 3, 9, -8 }, { 3, 10, -10 }, { 5, 11, -10 },
+			{ 5, 12, -12 }, { 5, 13, -12 }, { 7, 13, -12 }, { 13, 15, -12 }
+			}
+		}
+	},
+	{
+		.bpp = DSC_BPP(12), .bpc = 10,
+		{ 341, 15, 2048, 7, 16, 15, 15, {
+			{ 0, 2, 2 }, { 2, 5, 0 }, { 3, 7, 0 }, { 4, 8, -2 },
+			{ 6, 9, -4 }, { 7, 10, -6 }, { 7, 11, -8 }, { 7, 12, -8 },
+			{ 7, 13, -8 }, { 7, 14, -10 }, { 9, 15, -10 }, { 9, 16, -12 },
+			{ 9, 17, -12 }, { 11, 17, -12 }, { 17, 19, -12 }
+			}
+		}
+	},
+	{
+		.bpp = DSC_BPP(12), .bpc = 12,
+		{ 341, 15, 2048, 11, 20, 19, 19, {
+			{ 0, 6, 2 }, { 4, 9, 0 }, { 7, 11, 0 }, { 8, 12, -2 },
+			{ 10, 13, -4 }, { 11, 14, -6 }, { 11, 15, -8 }, { 11, 16, -8 },
+			{ 11, 17, -8 }, { 11, 18, -10 }, { 13, 19, -10 },
+			{ 13, 20, -12 }, { 13, 21, -12 }, { 15, 21, -12 },
+			{ 21, 23, -12 }
+			}
+		}
+	},
+	{ /* sentinel */ }
+};
+
+/*
+ * Selected Rate Control Related Parameter Recommended Values from DSC
+v1.2, v1.2a, v1.2b and
+ * DSC_v1.1_E1 specs.
+ *
+ * Cross-checked against C Model releases: DSC_model_20161212 and
+20210623  */ static const struct rc_parameters_data
+rc_parameters_1_2_444[] = {
  	{
  		.bpp = DSC_BPP(6), .bpc = 8,
  		{ 768, 15, 6144, 3, 13, 11, 11, {
@@ -388,22 +466,18 @@ static const struct rc_parameters_data
rc_parameters[] = {
  		{ 512, 12, 6144, 3, 12, 11, 11, {
  			{ 0, 4, 2 }, { 0, 4, 0 }, { 1, 5, 0 }, { 1, 6, -2 },
  			{ 3, 7, -4 }, { 3, 7, -6 }, { 3, 7, -8 }, { 3, 8, -8 },
-			{ 3, 9, -8 }, { 3, 10, -10 }, { 5, 11, -10 }, { 5, 12, -12 },
-			{ 5, 13, -12 }, { 7, 13, -12 }, { 13, 15, -12 }
+			{ 3, 9, -8 }, { 3, 10, -10 }, { 5, 10, -10 }, { 5, 11, -12 },
+			{ 5, 11, -12 }, { 9, 12, -12 }, { 12, 13, -12 }
  			}
  		}
  	},
  	{
  		.bpp = DSC_BPP(8), .bpc = 10,
  		{ 512, 12, 6144, 7, 16, 15, 15, {
-			/*
-			 * DSC model/pre-SCR-cfg has 8 for
range_max_qp[0], however
-			 * VESA DSC 1.1 Table E-5 sets it to 4.
-			 */
-			{ 0, 4, 2 }, { 4, 8, 0 }, { 5, 9, 0 }, { 5, 10, -2 },
+			{ 0, 8, 2 }, { 4, 8, 0 }, { 5, 9, 0 }, { 5, 10, -2 },
  			{ 7, 11, -4 }, { 7, 11, -6 }, { 7, 11, -8 }, { 7, 12, -8 },
-			{ 7, 13, -8 }, { 7, 14, -10 }, { 9, 15, -10 }, { 9, 16, -12 },
-			{ 9, 17, -12 }, { 11, 17, -12 }, { 17, 19, -12 }
+			{ 7, 13, -8 }, { 7, 14, -10 }, { 9, 14, -10 }, { 9, 15, -12 },
+			{ 9, 15, -12 }, { 13, 16, -12 }, { 16, 17, -12 }
  			}
  		}
  	},
@@ -412,9 +486,9 @@ static const struct rc_parameters_data
rc_parameters[] = {
  		{ 512, 12, 6144, 11, 20, 19, 19, {
  			{ 0, 12, 2 }, { 4, 12, 0 }, { 9, 13, 0 }, { 9, 14, -2 },
  			{ 11, 15, -4 }, { 11, 15, -6 }, { 11, 15, -8 }, { 11, 16, -8 },
-			{ 11, 17, -8 }, { 11, 18, -10 }, { 13, 19, -10 },
-			{ 13, 20, -12 }, { 13, 21, -12 }, { 15, 21, -12 },
-			{ 21, 23, -12 }
+			{ 11, 17, -8 }, { 11, 18, -10 }, { 13, 18, -10 },
+			{ 13, 19, -12 }, { 13, 19, -12 }, { 17, 20, -12 },
+			{ 20, 21, -12 }
  			}
  		}
  	},
@@ -498,8 +572,8 @@ static const struct rc_parameters_data
rc_parameters[] = {
  		{ 341, 15, 2048, 3, 12, 11, 11, {
  			{ 0, 2, 2 }, { 0, 4, 0 }, { 1, 5, 0 }, { 1, 6, -2 },
  			{ 3, 7, -4 }, { 3, 7, -6 }, { 3, 7, -8 }, { 3, 8, -8 },
-			{ 3, 9, -8 }, { 3, 10, -10 }, { 5, 11, -10 },
-			{ 5, 12, -12 }, { 5, 13, -12 }, { 7, 13, -12 }, { 13, 15, -12 }
+			{ 3, 8, -8 }, { 3, 9, -10 }, { 5, 9, -10 }, { 5, 9, -12 },
+			{ 5, 9, -12 }, { 7, 10, -12 }, { 10, 11, -12 }
  			}
  		}
  	},
@@ -508,8 +582,8 @@ static const struct rc_parameters_data
rc_parameters[] = {
  		{ 341, 15, 2048, 7, 16, 15, 15, {
  			{ 0, 2, 2 }, { 2, 5, 0 }, { 3, 7, 0 }, { 4, 8, -2 },
  			{ 6, 9, -4 }, { 7, 10, -6 }, { 7, 11, -8 }, { 7, 12, -8 },
-			{ 7, 13, -8 }, { 7, 14, -10 }, { 9, 15, -10 }, { 9, 16, -12 },
-			{ 9, 17, -12 }, { 11, 17, -12 }, { 17, 19, -12 }
+			{ 7, 12, -8 }, { 7, 13, -10 }, { 9, 13, -10 }, { 9, 13, -12 },
+			{ 9, 13, -12 }, { 11, 14, -12 }, { 14, 15, -12 }
  			}
  		}
  	},
@@ -518,9 +592,9 @@ static const struct rc_parameters_data
rc_parameters[] = {
  		{ 341, 15, 2048, 11, 20, 19, 19, {
  			{ 0, 6, 2 }, { 4, 9, 0 }, { 7, 11, 0 }, { 8, 12, -2 },
  			{ 10, 13, -4 }, { 11, 14, -6 }, { 11, 15, -8 }, { 11, 16, -8 },
-			{ 11, 17, -8 }, { 11, 18, -10 }, { 13, 19, -10 },
-			{ 13, 20, -12 }, { 13, 21, -12 }, { 15, 21, -12 },
-			{ 21, 23, -12 }
+			{ 11, 16, -8 }, { 11, 17, -10 }, { 13, 17, -10 },
+			{ 13, 17, -12 }, { 13, 17, -12 }, { 15, 18, -12 },
+			{ 18, 19, -12 }
  			}
  		}
  	},
@@ -602,7 +676,8 @@ static const struct rc_parameters_data
rc_parameters[] = {
  	{ /* sentinel */ }
  };

-static const struct rc_parameters *get_rc_params(u16 dsc_bpp,
+static const struct rc_parameters *get_rc_params(const struct
rc_parameters_data *rc_parameters,
+						 u16 dsc_bpp,
  						 u8 bits_per_component)
  {
  	int i;
@@ -622,11 +697,13 @@ static const struct rc_parameters
*get_rc_params(u16 dsc_bpp,
   * function.
   *
   * @vdsc_cfg: DSC Configuration data partially filled by driver
+ * @type: operating mode and standard to follow
   *
   * Return: 0 or -error code in case of an error
   */
-int drm_dsc_setup_rc_params(struct drm_dsc_config *vdsc_cfg)
+int drm_dsc_setup_rc_params(struct drm_dsc_config *vdsc_cfg, enum
+drm_dsc_params_type type)
  {
+	const struct rc_parameters_data *data;
  	const struct rc_parameters *rc_params;
  	int i;

@@ -634,7 +711,19 @@ int drm_dsc_setup_rc_params(struct
drm_dsc_config *vdsc_cfg)
  			 !vdsc_cfg->bits_per_component))
  		return -EINVAL;

-	rc_params = get_rc_params(vdsc_cfg->bits_per_pixel,
+	switch (kind) {


Shouldn't this be type now.


Yes. I missed one hunk when squashing fixup patches.





+	case DRM_DSC_1_2_444:
+		data = rc_parameters_1_2_444;
+		break;
+	case DRM_DSC_1_1_PRE_SCR:
+		data = rc_parameters_pre_scr;
+		break;
+	default:
+		return -EINVAL;
+	}
+
+	rc_params = get_rc_params(data,
+				  vdsc_cfg->bits_per_pixel,
  				  vdsc_cfg->bits_per_component);
  	if (!rc_params)
  		return -EINVAL;
diff --git a/drivers/gpu/drm/i915/display/intel_vdsc.c
b/drivers/gpu/drm/i915/display/intel_vdsc.c
index d4340b18c18d..bd9116d2cd76 100644
--- a/drivers/gpu/drm/i915/display/intel_vdsc.c
+++ b/drivers/gpu/drm/i915/display/intel_vdsc.c
@@ -226,7 +226,15 @@ int intel_dsc_compute_params(struct
intel_crtc_state *pipe_config)
  	if (DISPLAY_VER(dev_priv) >= 13) {
  		calculate_rc_params(vdsc_cfg);
  	} else {
-		ret = drm_dsc_setup_rc_params(vdsc_cfg);
+		if ((compressed_bpp == 8 ||
+		     compressed_bpp == 12) &&
+		    (vdsc_cfg->bits_per_component == 8 ||
+		     vdsc_cfg->bits_per_component == 10 ||
+		     vdsc_cfg->bits_per_component == 12))
+			ret = drm_dsc_setup_rc_params(vdsc_cfg,
DRM_DSC_1_1_PRE_SCR);
+		else
+			ret = drm_dsc_setup_rc_params(vdsc_cfg,
DRM_DSC_1_2_444);
+
  		if (ret)
  			return ret;

diff --git a/include/drm/display/drm_dsc_helper.h
b/include/drm/display/drm_dsc_helper.h
index 1681791f65a5..66eac7276d04 100644
--- a/include/drm/display/drm_dsc_helper.h
+++ b/include/drm/display/drm_dsc_helper.h
@@ -10,12 +10,17 @@

  #include <drm/display/drm_dsc.h>

+enum drm_dsc_params_type {
+	DRM_DSC_1_2_444,
+	DRM_DSC_1_1_PRE_SCR, /* legacy params from DSC 1.1 */ };
+
  void drm_dsc_dp_pps_header_init(struct dp_sdp_header *pps_header);  int
drm_dsc_dp_rc_buffer_size(u8 rc_buffer_block_size, u8 rc_buffer_size);
void drm_dsc_pps_payload_pack(struct drm_dsc_picture_parameter_set
*pps_sdp,
  			      const struct drm_dsc_config *dsc_cfg);  void
drm_dsc_set_rc_buf_thresh(struct drm_dsc_config *vdsc_cfg); -int
drm_dsc_setup_rc_params(struct drm_dsc_config *vdsc_cfg);
+int drm_dsc_setup_rc_params(struct drm_dsc_config *vdsc_cfg, enum
+drm_dsc_params_type type);
  int drm_dsc_compute_rc_parameters(struct drm_dsc_config *vdsc_cfg);

  #endif /* _DRM_DSC_HELPER_H_ */
--
2.39.2




--
With best wishes
Dmitry
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