1 files changed, 167 insertions, 452 deletions

diff --git a/drivers/gpu/drm/i915/display/intel_vdsc.c b/drivers/gpu/drm/i915/display/intel_vdsc.c
index 8e787c13d26d..9d76c2756784 100644
--- a/drivers/gpu/drm/i915/display/intel_vdsc.c
+++ b/drivers/gpu/drm/i915/display/intel_vdsc.c
@@ -19,327 +19,6 @@
 #include "intel_vdsc.h"
 #include "intel_vdsc_regs.h"
 
-enum ROW_INDEX_BPP {
-	ROW_INDEX_6BPP = 0,
-	ROW_INDEX_8BPP,
-	ROW_INDEX_10BPP,
-	ROW_INDEX_12BPP,
-	ROW_INDEX_15BPP,
-	MAX_ROW_INDEX
-};
-
-enum COLUMN_INDEX_BPC {
-	COLUMN_INDEX_8BPC = 0,
-	COLUMN_INDEX_10BPC,
-	COLUMN_INDEX_12BPC,
-	COLUMN_INDEX_14BPC,
-	COLUMN_INDEX_16BPC,
-	MAX_COLUMN_INDEX
-};
-
-/* From DSC_v1.11 spec, rc_parameter_Set syntax element typically constant */
-static const u16 rc_buf_thresh[] = {
-	896, 1792, 2688, 3584, 4480, 5376, 6272, 6720, 7168, 7616,
-	7744, 7872, 8000, 8064
-};
-
-struct rc_parameters {
-	u16 initial_xmit_delay;
-	u8 first_line_bpg_offset;
-	u16 initial_offset;
-	u8 flatness_min_qp;
-	u8 flatness_max_qp;
-	u8 rc_quant_incr_limit0;
-	u8 rc_quant_incr_limit1;
-	struct drm_dsc_rc_range_parameters rc_range_params[DSC_NUM_BUF_RANGES];
-};
-
-/*
- * Selected Rate Control Related Parameter Recommended Values
- * from DSC_v1.11 spec & C Model release: DSC_model_20161212
- */
-static const struct rc_parameters rc_parameters[][MAX_COLUMN_INDEX] = {
-{
-	/* 6BPP/8BPC */
-	{ 768, 15, 6144, 3, 13, 11, 11, {
-		{ 0, 4, 0 }, { 1, 6, -2 }, { 3, 8, -2 }, { 4, 8, -4 },
-		{ 5, 9, -6 }, { 5, 9, -6 }, { 6, 9, -6 }, { 6, 10, -8 },
-		{ 7, 11, -8 }, { 8, 12, -10 }, { 9, 12, -10 }, { 10, 12, -12 },
-		{ 10, 12, -12 }, { 11, 12, -12 }, { 13, 14, -12 }
-		}
-	},
-	/* 6BPP/10BPC */
-	{ 768, 15, 6144, 7, 17, 15, 15, {
-		{ 0, 8, 0 }, { 3, 10, -2 }, { 7, 12, -2 }, { 8, 12, -4 },
-		{ 9, 13, -6 }, { 9, 13, -6 }, { 10, 13, -6 }, { 10, 14, -8 },
-		{ 11, 15, -8 }, { 12, 16, -10 }, { 13, 16, -10 },
-		{ 14, 16, -12 }, { 14, 16, -12 }, { 15, 16, -12 },
-		{ 17, 18, -12 }
-		}
-	},
-	/* 6BPP/12BPC */
-	{ 768, 15, 6144, 11, 21, 19, 19, {
-		{ 0, 12, 0 }, { 5, 14, -2 }, { 11, 16, -2 }, { 12, 16, -4 },
-		{ 13, 17, -6 }, { 13, 17, -6 }, { 14, 17, -6 }, { 14, 18, -8 },
-		{ 15, 19, -8 }, { 16, 20, -10 }, { 17, 20, -10 },
-		{ 18, 20, -12 }, { 18, 20, -12 }, { 19, 20, -12 },
-		{ 21, 22, -12 }
-		}
-	},
-	/* 6BPP/14BPC */
-	{ 768, 15, 6144, 15, 25, 23, 27, {
-		{ 0, 16, 0 }, { 7, 18, -2 }, { 15, 20, -2 }, { 16, 20, -4 },
-		{ 17, 21, -6 }, { 17, 21, -6 }, { 18, 21, -6 }, { 18, 22, -8 },
-		{ 19, 23, -8 }, { 20, 24, -10 }, { 21, 24, -10 },
-		{ 22, 24, -12 }, { 22, 24, -12 }, { 23, 24, -12 },
-		{ 25, 26, -12 }
-		}
-	},
-	/* 6BPP/16BPC */
-	{ 768, 15, 6144, 19, 29, 27, 27, {
-		{ 0, 20, 0 }, { 9, 22, -2 }, { 19, 24, -2 }, { 20, 24, -4 },
-		{ 21, 25, -6 }, { 21, 25, -6 }, { 22, 25, -6 }, { 22, 26, -8 },
-		{ 23, 27, -8 }, { 24, 28, -10 }, { 25, 28, -10 },
-		{ 26, 28, -12 }, { 26, 28, -12 }, { 27, 28, -12 },
-		{ 29, 30, -12 }
-		}
-	},
-},
-{
-	/* 8BPP/8BPC */
-	{ 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 }
-		}
-	},
-	/* 8BPP/10BPC */
-	{ 512, 12, 6144, 7, 16, 15, 15, {
-		{ 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 }
-		}
-	},
-	/* 8BPP/12BPC */
-	{ 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 }
-		}
-	},
-	/* 8BPP/14BPC */
-	{ 512, 12, 6144, 15, 24, 23, 23, {
-		{ 0, 12, 0 }, { 5, 13, 0 }, { 11, 15, 0 }, { 12, 17, -2 },
-		{ 15, 19, -4 }, { 15, 19, -6 }, { 15, 19, -8 }, { 15, 20, -8 },
-		{ 15, 21, -8 }, { 15, 22, -10 }, { 17, 22, -10 },
-		{ 17, 23, -12 }, { 17, 23, -12 }, { 21, 24, -12 },
-		{ 24, 25, -12 }
-		}
-	},
-	/* 8BPP/16BPC */
-	{ 512, 12, 6144, 19, 28, 27, 27, {
-		{ 0, 12, 2 }, { 6, 14, 0 }, { 13, 17, 0 }, { 15, 20, -2 },
-		{ 19, 23, -4 }, { 19, 23, -6 }, { 19, 23, -8 }, { 19, 24, -8 },
-		{ 19, 25, -8 }, { 19, 26, -10 }, { 21, 26, -10 },
-		{ 21, 27, -12 }, { 21, 27, -12 }, { 25, 28, -12 },
-		{ 28, 29, -12 }
-		}
-	},
-},
-{
-	/* 10BPP/8BPC */
-	{ 410, 15, 5632, 3, 12, 11, 11, {
-		{ 0, 3, 2 }, { 0, 4, 0 }, { 1, 5, 0 }, { 2, 6, -2 },
-		{ 3, 7, -4 }, { 3, 7, -6 }, { 3, 7, -8 }, { 3, 8, -8 },
-		{ 3, 9, -8 }, { 3, 9, -10 }, { 5, 10, -10 }, { 5, 10, -10 },
-		{ 5, 11, -12 }, { 7, 11, -12 }, { 11, 12, -12 }
-		}
-	},
-	/* 10BPP/10BPC */
-	{ 410, 15, 5632, 7, 16, 15, 15, {
-		{ 0, 7, 2 }, { 4, 8, 0 }, { 5, 9, 0 }, { 6, 10, -2 },
-		{ 7, 11, -4 }, { 7, 11, -6 }, { 7, 11, -8 }, { 7, 12, -8 },
-		{ 7, 13, -8 }, { 7, 13, -10 }, { 9, 14, -10 }, { 9, 14, -10 },
-		{ 9, 15, -12 }, { 11, 15, -12 }, { 15, 16, -12 }
-		}
-	},
-	/* 10BPP/12BPC */
-	{ 410, 15, 5632, 11, 20, 19, 19, {
-		{ 0, 11, 2 }, { 4, 12, 0 }, { 9, 13, 0 }, { 10, 14, -2 },
-		{ 11, 15, -4 }, { 11, 15, -6 }, { 11, 15, -8 }, { 11, 16, -8 },
-		{ 11, 17, -8 }, { 11, 17, -10 }, { 13, 18, -10 },
-		{ 13, 18, -10 }, { 13, 19, -12 }, { 15, 19, -12 },
-		{ 19, 20, -12 }
-		}
-	},
-	/* 10BPP/14BPC */
-	{ 410, 15, 5632, 15, 24, 23, 23, {
-		{ 0, 11, 2 }, { 5, 13, 0 }, { 11, 15, 0 }, { 13, 18, -2 },
-		{ 15, 19, -4 }, { 15, 19, -6 }, { 15, 19, -8 }, { 15, 20, -8 },
-		{ 15, 21, -8 }, { 15, 21, -10 }, { 17, 22, -10 },
-		{ 17, 22, -10 }, { 17, 23, -12 }, { 19, 23, -12 },
-		{ 23, 24, -12 }
-		}
-	},
-	/* 10BPP/16BPC */
-	{ 410, 15, 5632, 19, 28, 27, 27, {
-		{ 0, 11, 2 }, { 6, 14, 0 }, { 13, 17, 0 }, { 16, 20, -2 },
-		{ 19, 23, -4 }, { 19, 23, -6 }, { 19, 23, -8 }, { 19, 24, -8 },
-		{ 19, 25, -8 }, { 19, 25, -10 }, { 21, 26, -10 },
-		{ 21, 26, -10 }, { 21, 27, -12 }, { 23, 27, -12 },
-		{ 27, 28, -12 }
-		}
-	},
-},
-{
-	/* 12BPP/8BPC */
-	{ 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 }
-		}
-	},
-	/* 12BPP/10BPC */
-	{ 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 }
-		}
-	},
-	/* 12BPP/12BPC */
-	{ 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 }
-		}
-	},
-	/* 12BPP/14BPC */
-	{ 341, 15, 2048, 15, 24, 23, 23, {
-		{ 0, 6, 2 }, { 7, 10, 0 }, { 9, 13, 0 }, { 11, 16, -2 },
-		{ 14, 17, -4 }, { 15, 18, -6 }, { 15, 19, -8 }, { 15, 20, -8 },
-		{ 15, 20, -8 }, { 15, 21, -10 }, { 17, 21, -10 },
-		{ 17, 21, -12 }, { 17, 21, -12 }, { 19, 22, -12 },
-		{ 22, 23, -12 }
-		}
-	},
-	/* 12BPP/16BPC */
-	{ 341, 15, 2048, 19, 28, 27, 27, {
-		{ 0, 6, 2 }, { 6, 11, 0 }, { 11, 15, 0 }, { 14, 18, -2 },
-		{ 18, 21, -4 }, { 19, 22, -6 }, { 19, 23, -8 }, { 19, 24, -8 },
-		{ 19, 24, -8 }, { 19, 25, -10 }, { 21, 25, -10 },
-		{ 21, 25, -12 }, { 21, 25, -12 }, { 23, 26, -12 },
-		{ 26, 27, -12 }
-		}
-	},
-},
-{
-	/* 15BPP/8BPC */
-	{ 273, 15, 2048, 3, 12, 11, 11, {
-		{ 0, 0, 10 }, { 0, 1, 8 }, { 0, 1, 6 }, { 0, 2, 4 },
-		{ 1, 2, 2 }, { 1, 3, 0 }, { 1, 3, -2 }, { 2, 4, -4 },
-		{ 2, 5, -6 }, { 3, 5, -8 }, { 4, 6, -10 }, { 4, 7, -10 },
-		{ 5, 7, -12 }, { 7, 8, -12 }, { 8, 9, -12 }
-		}
-	},
-	/* 15BPP/10BPC */
-	{ 273, 15, 2048, 7, 16, 15, 15, {
-		{ 0, 2, 10 }, { 2, 5, 8 }, { 3, 5, 6 }, { 4, 6, 4 },
-		{ 5, 6, 2 }, { 5, 7, 0 }, { 5, 7, -2 }, { 6, 8, -4 },
-		{ 6, 9, -6 }, { 7, 9, -8 }, { 8, 10, -10 }, { 8, 11, -10 },
-		{ 9, 11, -12 }, { 11, 12, -12 }, { 12, 13, -12 }
-		}
-	},
-	/* 15BPP/12BPC */
-	{ 273, 15, 2048, 11, 20, 19, 19, {
-		{ 0, 4, 10 }, { 2, 7, 8 }, { 4, 9, 6 }, { 6, 11, 4 },
-		{ 9, 11, 2 }, { 9, 11, 0 }, { 9, 12, -2 }, { 10, 12, -4 },
-		{ 11, 13, -6 }, { 11, 13, -8 }, { 12, 14, -10 },
-		{ 13, 15, -10 }, { 13, 15, -12 }, { 15, 16, -12 },
-		{ 16, 17, -12 }
-		}
-	},
-	/* 15BPP/14BPC */
-	{ 273, 15, 2048, 15, 24, 23, 23, {
-		{ 0, 4, 10 }, { 3, 8, 8 }, { 6, 11, 6 }, { 9, 14, 4 },
-		{ 13, 15, 2 }, { 13, 15, 0 }, { 13, 16, -2 }, { 14, 16, -4 },
-		{ 15, 17, -6 }, { 15, 17, -8 }, { 16, 18, -10 },
-		{ 17, 19, -10 }, { 17, 19, -12 }, { 19, 20, -12 },
-		{ 20, 21, -12 }
-		}
-	},
-	/* 15BPP/16BPC */
-	{ 273, 15, 2048, 19, 28, 27, 27, {
-		{ 0, 4, 10 }, { 4, 9, 8 }, { 8, 13, 6 }, { 12, 17, 4 },
-		{ 17, 19, 2 }, { 17, 20, 0 }, { 17, 20, -2 }, { 18, 20, -4 },
-		{ 19, 21, -6 }, { 19, 21, -8 }, { 20, 22, -10 },
-		{ 21, 23, -10 }, { 21, 23, -12 }, { 23, 24, -12 },
-		{ 24, 25, -12 }
-		}
-	}
-}
-
-};
-
-static int get_row_index_for_rc_params(u16 compressed_bpp)
-{
-	switch (compressed_bpp) {
-	case 6:
-		return ROW_INDEX_6BPP;
-	case 8:
-		return ROW_INDEX_8BPP;
-	case 10:
-		return ROW_INDEX_10BPP;
-	case 12:
-		return ROW_INDEX_12BPP;
-	case 15:
-		return ROW_INDEX_15BPP;
-	default:
-		return -EINVAL;
-	}
-}
-
-static int get_column_index_for_rc_params(u8 bits_per_component)
-{
-	switch (bits_per_component) {
-	case 8:
-		return COLUMN_INDEX_8BPC;
-	case 10:
-		return COLUMN_INDEX_10BPC;
-	case 12:
-		return COLUMN_INDEX_12BPC;
-	case 14:
-		return COLUMN_INDEX_14BPC;
-	case 16:
-		return COLUMN_INDEX_16BPC;
-	default:
-		return -EINVAL;
-	}
-}
-
-static const struct rc_parameters *get_rc_params(u16 compressed_bpp,
-						 u8 bits_per_component)
-{
-	int row_index, column_index;
-
-	row_index = get_row_index_for_rc_params(compressed_bpp);
-	if (row_index < 0)
-		return NULL;
-
-	column_index = get_column_index_for_rc_params(bits_per_component);
-	if (column_index < 0)
-		return NULL;
-
-	return &rc_parameters[row_index][column_index];
-}
-
 bool intel_dsc_source_support(const struct intel_crtc_state *crtc_state)
 {
 	const struct intel_crtc *crtc = to_intel_crtc(crtc_state->uapi.crtc);
@@ -374,76 +53,163 @@ static bool is_pipe_dsc(struct intel_crtc *crtc, enum transcoder cpu_transcoder)
 }
 
 static void
-calculate_rc_params(struct rc_parameters *rc,
-		    struct drm_dsc_config *vdsc_cfg)
+intel_vdsc_set_min_max_qp(struct drm_dsc_config *vdsc_cfg, int buf,
+			  int bpp)
+{
+	int bpc = vdsc_cfg->bits_per_component;
+
+	/* Read range_minqp and range_max_qp from qp tables */
+	vdsc_cfg->rc_range_params[buf].range_min_qp =
+		intel_lookup_range_min_qp(bpc, buf, bpp, vdsc_cfg->native_420);
+	vdsc_cfg->rc_range_params[buf].range_max_qp =
+		intel_lookup_range_max_qp(bpc, buf, bpp, vdsc_cfg->native_420);
+}
+
+/*
+ * We are using the method provided in DSC 1.2a C-Model in codec_main.c
+ * Above method use a common formula to derive values for any combination of DSC
+ * variables. The formula approach may yield slight differences in the derived PPS
+ * parameters from the original parameter sets. These differences are not consequential
+ * to the coding performance because all parameter sets have been shown to produce
+ * visually lossless quality (provides the same PPS values as
+ * DSCParameterValuesVESA V1-2 spreadsheet).
+ */
+static void
+calculate_rc_params(struct drm_dsc_config *vdsc_cfg)
 {
 	int bpc = vdsc_cfg->bits_per_component;
 	int bpp = vdsc_cfg->bits_per_pixel >> 4;
-	static const s8 ofs_und6[] = {
-		0, -2, -2, -4, -6, -6, -8, -8, -8, -10, -10, -12, -12, -12, -12
-	};
-	static const s8 ofs_und8[] = {
-		2, 0, 0, -2, -4, -6, -8, -8, -8, -10, -10, -10, -12, -12, -12
-	};
-	static const s8 ofs_und12[] = {
-		2, 0, 0, -2, -4, -6, -8, -8, -8, -10, -10, -10, -12, -12, -12
-	};
-	static const s8 ofs_und15[] = {
-		10, 8, 6, 4, 2, 0, -2, -4, -6, -8, -10, -10, -12, -12, -12
-	};
 	int qp_bpc_modifier = (bpc - 8) * 2;
 	u32 res, buf_i, bpp_i;
 
 	if (vdsc_cfg->slice_height >= 8)
-		rc->first_line_bpg_offset =
+		vdsc_cfg->first_line_bpg_offset =
 			12 + DIV_ROUND_UP((9 * min(34, vdsc_cfg->slice_height - 8)), 100);
 	else
-		rc->first_line_bpg_offset = 2 * (vdsc_cfg->slice_height - 1);
+		vdsc_cfg->first_line_bpg_offset = 2 * (vdsc_cfg->slice_height - 1);
+
+	/*
+	 * According to DSC 1.2 spec in Section 4.1 if native_420 is set:
+	 * -second_line_bpg_offset is 12 in general and equal to 2*(slice_height-1) if slice
+	 * height < 8.
+	 * -second_line_offset_adj is 512 as shown by emperical values to yield best chroma
+	 * preservation in second line.
+	 * -nsl_bpg_offset is calculated as second_line_offset/slice_height -1 then rounded
+	 * up to 16 fractional bits, we left shift second line offset by 11 to preserve 11
+	 * fractional bits.
+	 */
+	if (vdsc_cfg->native_420) {
+		if (vdsc_cfg->slice_height >= 8)
+			vdsc_cfg->second_line_bpg_offset = 12;
+		else
+			vdsc_cfg->second_line_bpg_offset =
+				2 * (vdsc_cfg->slice_height - 1);
+
+		vdsc_cfg->second_line_offset_adj = 512;
+		vdsc_cfg->nsl_bpg_offset = DIV_ROUND_UP(vdsc_cfg->second_line_bpg_offset << 11,
+							vdsc_cfg->slice_height - 1);
+	}
 
 	/* Our hw supports only 444 modes as of today */
 	if (bpp >= 12)
-		rc->initial_offset = 2048;
+		vdsc_cfg->initial_offset = 2048;
 	else if (bpp >= 10)
-		rc->initial_offset = 5632 - DIV_ROUND_UP(((bpp - 10) * 3584), 2);
+		vdsc_cfg->initial_offset = 5632 - DIV_ROUND_UP(((bpp - 10) * 3584), 2);
 	else if (bpp >= 8)
-		rc->initial_offset = 6144 - DIV_ROUND_UP(((bpp - 8) * 512), 2);
+		vdsc_cfg->initial_offset = 6144 - DIV_ROUND_UP(((bpp - 8) * 512), 2);
 	else
-		rc->initial_offset = 6144;
+		vdsc_cfg->initial_offset = 6144;
 
 	/* initial_xmit_delay = rc_model_size/2/compression_bpp */
-	rc->initial_xmit_delay = DIV_ROUND_UP(DSC_RC_MODEL_SIZE_CONST, 2 * bpp);
-
-	rc->flatness_min_qp = 3 + qp_bpc_modifier;
-	rc->flatness_max_qp = 12 + qp_bpc_modifier;
-
-	rc->rc_quant_incr_limit0 = 11 + qp_bpc_modifier;
-	rc->rc_quant_incr_limit1 = 11 + qp_bpc_modifier;
-
-	bpp_i  = (2 * (bpp - 6));
-	for (buf_i = 0; buf_i < DSC_NUM_BUF_RANGES; buf_i++) {
-		/* Read range_minqp and range_max_qp from qp tables */
-		rc->rc_range_params[buf_i].range_min_qp =
-			intel_lookup_range_min_qp(bpc, buf_i, bpp_i, vdsc_cfg->native_420);
-		rc->rc_range_params[buf_i].range_max_qp =
-			intel_lookup_range_max_qp(bpc, buf_i, bpp_i, vdsc_cfg->native_420);
-
-		/* Calculate range_bgp_offset */
-		if (bpp <= 6) {
-			rc->rc_range_params[buf_i].range_bpg_offset = ofs_und6[buf_i];
-		} else if (bpp <= 8) {
-			res = DIV_ROUND_UP(((bpp - 6) * (ofs_und8[buf_i] - ofs_und6[buf_i])), 2);
-			rc->rc_range_params[buf_i].range_bpg_offset =
-								ofs_und6[buf_i] + res;
-		} else if (bpp <= 12) {
-			rc->rc_range_params[buf_i].range_bpg_offset =
-								ofs_und8[buf_i];
-		} else if (bpp <= 15) {
-			res = DIV_ROUND_UP(((bpp - 12) * (ofs_und15[buf_i] - ofs_und12[buf_i])), 3);
-			rc->rc_range_params[buf_i].range_bpg_offset =
-								ofs_und12[buf_i] + res;
-		} else {
-			rc->rc_range_params[buf_i].range_bpg_offset =
-								ofs_und15[buf_i];
+	vdsc_cfg->initial_xmit_delay = DIV_ROUND_UP(DSC_RC_MODEL_SIZE_CONST, 2 * bpp);
+
+	vdsc_cfg->flatness_min_qp = 3 + qp_bpc_modifier;
+	vdsc_cfg->flatness_max_qp = 12 + qp_bpc_modifier;
+
+	vdsc_cfg->rc_quant_incr_limit0 = 11 + qp_bpc_modifier;
+	vdsc_cfg->rc_quant_incr_limit1 = 11 + qp_bpc_modifier;
+
+	if (vdsc_cfg->native_420) {
+		static const s8 ofs_und4[] = {
+			2, 0, 0, -2, -4, -6, -8, -8, -8, -10, -10, -12, -12, -12, -12
+		};
+		static const s8 ofs_und5[] = {
+			2, 0, 0, -2, -4, -6, -8, -8, -8, -10, -10, -10, -12, -12, -12
+		};
+		static const s8 ofs_und6[] = {
+			2, 0, 0, -2, -4, -6, -8, -8, -8, -10, -10, -10, -12, -12, -12
+		};
+		static const s8 ofs_und8[] = {
+			10, 8, 6, 4, 2, 0, -2, -4, -6, -8, -10, -10, -12, -12, -12
+		};
+
+		bpp_i  = bpp - 8;
+		for (buf_i = 0; buf_i < DSC_NUM_BUF_RANGES; buf_i++) {
+			u8 range_bpg_offset;
+
+			intel_vdsc_set_min_max_qp(vdsc_cfg, buf_i, bpp_i);
+
+			/* Calculate range_bpg_offset */
+			if (bpp <= 8) {
+				range_bpg_offset = ofs_und4[buf_i];
+			} else if (bpp <= 10) {
+				res = DIV_ROUND_UP(((bpp - 8) *
+						    (ofs_und5[buf_i] - ofs_und4[buf_i])), 2);
+				range_bpg_offset = ofs_und4[buf_i] + res;
+			} else if (bpp <= 12) {
+				res = DIV_ROUND_UP(((bpp - 10) *
+						    (ofs_und6[buf_i] - ofs_und5[buf_i])), 2);
+				range_bpg_offset = ofs_und5[buf_i] + res;
+			} else if (bpp <= 16) {
+				res = DIV_ROUND_UP(((bpp - 12) *
+						    (ofs_und8[buf_i] - ofs_und6[buf_i])), 4);
+				range_bpg_offset = ofs_und6[buf_i] + res;
+			} else {
+				range_bpg_offset = ofs_und8[buf_i];
+			}
+
+			vdsc_cfg->rc_range_params[buf_i].range_bpg_offset =
+				range_bpg_offset & DSC_RANGE_BPG_OFFSET_MASK;
+		}
+	} else {
+		static const s8 ofs_und6[] = {
+			0, -2, -2, -4, -6, -6, -8, -8, -8, -10, -10, -12, -12, -12, -12
+		};
+		static const s8 ofs_und8[] = {
+			2, 0, 0, -2, -4, -6, -8, -8, -8, -10, -10, -10, -12, -12, -12
+		};
+		static const s8 ofs_und12[] = {
+			2, 0, 0, -2, -4, -6, -8, -8, -8, -10, -10, -10, -12, -12, -12
+		};
+		static const s8 ofs_und15[] = {
+			10, 8, 6, 4, 2, 0, -2, -4, -6, -8, -10, -10, -12, -12, -12
+		};
+
+		bpp_i  = (2 * (bpp - 6));
+		for (buf_i = 0; buf_i < DSC_NUM_BUF_RANGES; buf_i++) {
+			u8 range_bpg_offset;
+
+			intel_vdsc_set_min_max_qp(vdsc_cfg, buf_i, bpp_i);
+
+			/* Calculate range_bpg_offset */
+			if (bpp <= 6) {
+				range_bpg_offset = ofs_und6[buf_i];
+			} else if (bpp <= 8) {
+				res = DIV_ROUND_UP(((bpp - 6) *
+						    (ofs_und8[buf_i] - ofs_und6[buf_i])), 2);
+				range_bpg_offset = ofs_und6[buf_i] + res;
+			} else if (bpp <= 12) {
+				range_bpg_offset = ofs_und8[buf_i];
+			} else if (bpp <= 15) {
+				res = DIV_ROUND_UP(((bpp - 12) *
+						    (ofs_und15[buf_i] - ofs_und12[buf_i])), 3);
+				range_bpg_offset = ofs_und12[buf_i] + res;
+			} else {
+				range_bpg_offset = ofs_und15[buf_i];
+			}
+
+			vdsc_cfg->rc_range_params[buf_i].range_bpg_offset =
+				range_bpg_offset & DSC_RANGE_BPG_OFFSET_MASK;
 		}
 	}
 }
@@ -477,10 +243,8 @@ int intel_dsc_compute_params(struct intel_crtc_state *pipe_config)
 	struct drm_i915_private *dev_priv = to_i915(crtc->base.dev);
 	struct drm_dsc_config *vdsc_cfg = &pipe_config->dsc.config;
 	u16 compressed_bpp = pipe_config->dsc.compressed_bpp;
-	const struct rc_parameters *rc_params;
-	struct rc_parameters *rc = NULL;
 	int err;
-	u8 i = 0;
+	int ret;
 
 	vdsc_cfg->pic_width = pipe_config->hw.adjusted_mode.crtc_hdisplay;
 	vdsc_cfg->slice_width = DIV_ROUND_UP(vdsc_cfg->pic_width,
@@ -513,49 +277,15 @@ int intel_dsc_compute_params(struct intel_crtc_state *pipe_config)
 	vdsc_cfg->bits_per_pixel = compressed_bpp << 4;
 
 	/*
-	 * According to DSC 1.2 specs in Section 4.1 if native_420 is set:
-	 * -We need to double the current bpp.
-	 * -second_line_bpg_offset is 12 in general and equal to 2*(slice_height-1) if slice
-	 * height < 8.
-	 * -second_line_offset_adj is 512 as shown by emperical values to yeild best chroma
-	 * preservation in second line.
-	 * -nsl_bpg_offset is calculated as second_line_offset/slice_height -1 then rounded
-	 * up to 16 fractional bits, we left shift second line offset by 11 to preserve 11
-	 * fractional bits.
+	 * According to DSC 1.2 specs in Section 4.1 if native_420 is set
+	 * we need to double the current bpp.
 	 */
-	if (vdsc_cfg->native_420) {
+	if (vdsc_cfg->native_420)
 		vdsc_cfg->bits_per_pixel <<= 1;
 
-		if (vdsc_cfg->slice_height >= 8)
-			vdsc_cfg->second_line_bpg_offset = 12;
-		else
-			vdsc_cfg->second_line_bpg_offset =
-				2 * (vdsc_cfg->slice_height - 1);
-
-		vdsc_cfg->second_line_offset_adj = 512;
-		vdsc_cfg->nsl_bpg_offset = DIV_ROUND_UP(vdsc_cfg->second_line_bpg_offset << 11,
-							vdsc_cfg->slice_height - 1);
-	}
-
 	vdsc_cfg->bits_per_component = pipe_config->pipe_bpp / 3;
 
-	for (i = 0; i < DSC_NUM_BUF_RANGES - 1; i++) {
-		/*
-		 * six 0s are appended to the lsb of each threshold value
-		 * internally in h/w.
-		 * Only 8 bits are allowed for programming RcBufThreshold
-		 */
-		vdsc_cfg->rc_buf_thresh[i] = rc_buf_thresh[i] >> 6;
-	}
-
-	/*
-	 * For 6bpp, RC Buffer threshold 12 and 13 need a different value
-	 * as per C Model
-	 */
-	if (compressed_bpp == 6) {
-		vdsc_cfg->rc_buf_thresh[12] = 0x7C;
-		vdsc_cfg->rc_buf_thresh[13] = 0x7D;
-	}
+	drm_dsc_set_rc_buf_thresh(vdsc_cfg);
 
 	/*
 	 * From XE_LPD onwards we supports compression bpps in steps of 1
@@ -563,39 +293,19 @@ int intel_dsc_compute_params(struct intel_crtc_state *pipe_config)
 	 * parameters
 	 */
 	if (DISPLAY_VER(dev_priv) >= 13) {
-		rc = kmalloc(sizeof(*rc), GFP_KERNEL);
-		if (!rc)
-			return -ENOMEM;
-
-		calculate_rc_params(rc, vdsc_cfg);
-		rc_params = rc;
+		calculate_rc_params(vdsc_cfg);
 	} else {
-		rc_params = get_rc_params(compressed_bpp,
-					  vdsc_cfg->bits_per_component);
-		if (!rc_params)
-			return -EINVAL;
-	}
-
-	vdsc_cfg->first_line_bpg_offset = rc_params->first_line_bpg_offset;
-	vdsc_cfg->initial_xmit_delay = rc_params->initial_xmit_delay;
-	vdsc_cfg->initial_offset = rc_params->initial_offset;
-	vdsc_cfg->flatness_min_qp = rc_params->flatness_min_qp;
-	vdsc_cfg->flatness_max_qp = rc_params->flatness_max_qp;
-	vdsc_cfg->rc_quant_incr_limit0 = rc_params->rc_quant_incr_limit0;
-	vdsc_cfg->rc_quant_incr_limit1 = rc_params->rc_quant_incr_limit1;
+		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);
 
-	for (i = 0; i < DSC_NUM_BUF_RANGES; i++) {
-		vdsc_cfg->rc_range_params[i].range_min_qp =
-			rc_params->rc_range_params[i].range_min_qp;
-		vdsc_cfg->rc_range_params[i].range_max_qp =
-			rc_params->rc_range_params[i].range_max_qp;
-		/*
-		 * Range BPG Offset uses 2's complement and is only a 6 bits. So
-		 * mask it to get only 6 bits.
-		 */
-		vdsc_cfg->rc_range_params[i].range_bpg_offset =
-			rc_params->rc_range_params[i].range_bpg_offset &
-			DSC_RANGE_BPG_OFFSET_MASK;
+		if (ret)
+			return ret;
 	}
 
 	/*
@@ -612,8 +322,6 @@ int intel_dsc_compute_params(struct intel_crtc_state *pipe_config)
 	vdsc_cfg->initial_scale_value = (vdsc_cfg->rc_model_size << 3) /
 		(vdsc_cfg->rc_model_size - vdsc_cfg->initial_offset);
 
-	kfree(rc);
-
 	return 0;
 }
 
@@ -642,6 +350,16 @@ intel_dsc_power_domain(struct intel_crtc *crtc, enum transcoder cpu_transcoder)
 		return POWER_DOMAIN_TRANSCODER_VDSC_PW2;
 }
 
+int intel_dsc_get_num_vdsc_instances(const struct intel_crtc_state *crtc_state)
+{
+	int num_vdsc_instances = (crtc_state->dsc.dsc_split) ? 2 : 1;
+
+	if (crtc_state->bigjoiner_pipes)
+		num_vdsc_instances *= 2;
+
+	return num_vdsc_instances;
+}
+
 static void intel_dsc_pps_configure(const struct intel_crtc_state *crtc_state)
 {
 	struct intel_crtc *crtc = to_intel_crtc(crtc_state->uapi.crtc);
@@ -652,11 +370,8 @@ static void intel_dsc_pps_configure(const struct intel_crtc_state *crtc_state)
 	u32 pps_val = 0;
 	u32 rc_buf_thresh_dword[4];
 	u32 rc_range_params_dword[8];
-	u8 num_vdsc_instances = (crtc_state->dsc.dsc_split) ? 2 : 1;
 	int i = 0;
-
-	if (crtc_state->bigjoiner_pipes)
-		num_vdsc_instances *= 2;
+	int num_vdsc_instances = intel_dsc_get_num_vdsc_instances(crtc_state);
 
 	/* Populate PICTURE_PARAMETER_SET_0 registers */
 	pps_val = DSC_VER_MAJ | vdsc_cfg->dsc_version_minor <<