drm/display/dsc: split DSC 1.2 and DSC 1.1 (pre-SCR) parameters

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@linaro.org>
Reviewed-by: Suraj Kandpal
Reviewed-by: Suraj Kandpal
Reviewed-by: Suraj Kandpal <suraj.kandpal@intel.com>
Signed-off-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20230517102807.2181589-7-dmitry.baryshkov@linaro.org
Acked-by: Dave Airlie <airlied@redhat.com>

1 files changed, 114 insertions, 25 deletions

diff --git a/drivers/gpu/drm/display/drm_dsc_helper.c b/drivers/gpu/drm/display/drm_dsc_helper.c
index acb93d4116e0..f1ba39df5708 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 (type) {
+	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;