disp: msm: add look up table for dsc format specific rc params

Current SDE driver computes rc parameters considering only bpp
and chroma format and its values do not match the recommended
settings. Add a look up table for these dsc encoder format
specific initial rate control settings.

Change-Id: Iff4cd0534618eb043351fd2a9c7759b8ee503f76
Signed-off-by: Prabhanjan Kandula <[email protected]>

msm/sde_dsc_helper.c

@@ -103,6 +103,36 @@ static char sde_dsc_rc_range_bpg[DSC_RATIO_TYPE_MAX][DSC_NUM_BUF_RANGES] = {
 	{10, 8, 6, 4, 2, 0, -2, -4, -6, -8, -10, -10, -12, -12, -12},
 };
 
+static struct sde_dsc_rc_init_params_lut {
+	u32 rc_quant_incr_limit0;
+	u32 rc_quant_incr_limit1;
+	u32 initial_fullness_offset;
+	u32 initial_xmit_delay;
+	u32 second_line_bpg_offset;
+	u32 second_line_offset_adj;
+	u32 flatness_min_qp;
+	u32 flatness_max_qp;
+}  sde_dsc_rc_init_param_lut[] = {
+	/* DSC v1.1 */
+	{11, 11, 6144, 512, 0, 0, 3, 12}, /* DSC_V11_8BPC_8BPP */
+	{15, 15, 6144, 512, 0, 0, 7, 16}, /* DSC_V11_10BPC_8BPP */
+	{15, 15, 5632, 410, 0, 0, 7, 16}, /* DSC_V11_10BPC_10BPP */
+	/* DSC v1.1 SCR and DSC v1.2 RGB 444 */
+	{11, 11, 6144, 512, 0, 0, 3, 12}, /* DSC_V12_444_8BPC_8BPP or DSC_V11_SCR1_8BPC_8BPP */
+	{15, 15, 6144, 512, 0, 0, 7, 16}, /* DSC_V12_444_10BPC_8BPP or DSC_V11_SCR1_10BPC_8BPP */
+	{15, 15, 5632, 410, 0, 0, 7, 16}, /* DSC_V12_444_10BPC_10BPP or DSC_V11_SCR1_10BPC_10BPP */
+	/* DSC v1.2 YUV422 */
+	{11, 11, 5632, 410, 0, 0, 3, 12}, /* DSC_V12_422_8BPC_7BPP */
+	{11, 11, 2048, 341, 0, 0, 3, 12}, /* DSC_V12_422_8BPC_8BPP */
+	{15, 15, 5632, 410, 0, 0, 7, 16}, /* DSC_V12_422_10BPC_7BPP */
+	{15, 15, 2048, 273, 0, 0, 7, 16}, /* DSC_V12_422_10BPC_10BPP */
+	/* DSC v1.2 YUV420 */
+	{11, 11, 5632, 410, 0, 0, 3, 12},    /* DSC_V12_422_8BPC_7BPP */
+	{11, 11, 2048, 341, 12, 512, 3, 12}, /* DSC_V12_420_8BPC_6BPP */
+	{15, 15, 2048, 341, 12, 512, 7, 16}, /* DSC_V12_420_10BPC_6BPP */
+	{15, 15, 2048, 256, 12, 512, 7, 16}, /* DSC_V12_420_10BPC_7_5BPP */
+};
+
 /**
  * Maps to lookup the sde_dsc_ratio_type index used in rate control tables
  */
@@ -210,6 +240,7 @@ int sde_dsc_populate_dsc_config(struct drm_dsc_config *dsc, int scr_ver) {
 	int slice_bits;
 	int data;
 	int final_value, final_scale;
+	struct sde_dsc_rc_init_params_lut *rc_param_lut;
 	int i, ratio_idx;
 
 	dsc->rc_model_size = 8192;
@@ -235,8 +266,8 @@ int sde_dsc_populate_dsc_config(struct drm_dsc_config *dsc, int scr_ver) {
 	bpc = dsc->bits_per_component;
 
 	ratio_idx = _get_rc_table_index(dsc, scr_ver);
-	if (ratio_idx == -EINVAL)
-		return ratio_idx;
+	if ((ratio_idx < 0) || (ratio_idx >= DSC_RATIO_TYPE_MAX))
+		return -EINVAL;
 
 	for (i = 0; i < DSC_NUM_BUF_RANGES - 1; i++)
 		dsc->rc_buf_thresh[i] = sde_dsc_rc_buf_thresh[i];
@@ -250,45 +281,22 @@ int sde_dsc_populate_dsc_config(struct drm_dsc_config *dsc, int scr_ver) {
 			sde_dsc_rc_range_bpg[ratio_idx][i];
 	}
 
-	if (bpp == 8) {
-		dsc->initial_offset = 6144;
-		dsc->initial_xmit_delay = 512;
-	} else if (bpp == 10) {
-		dsc->initial_offset = 5632;
-		dsc->initial_xmit_delay = 410;
-	} else {
-		dsc->initial_offset = 2048;
-		dsc->initial_xmit_delay = 341;
-	}
+	rc_param_lut = &sde_dsc_rc_init_param_lut[ratio_idx];
+	dsc->rc_quant_incr_limit0 = rc_param_lut->rc_quant_incr_limit0;
+	dsc->rc_quant_incr_limit1 = rc_param_lut->rc_quant_incr_limit1;
+	dsc->initial_offset = rc_param_lut->initial_fullness_offset;
+	dsc->initial_xmit_delay = rc_param_lut->initial_xmit_delay;
+	dsc->second_line_bpg_offset = rc_param_lut->second_line_bpg_offset;
+	dsc->second_line_offset_adj = rc_param_lut->second_line_offset_adj;
+	dsc->flatness_min_qp = rc_param_lut->flatness_min_qp;
+	dsc->flatness_max_qp = rc_param_lut->flatness_max_qp;
 
 	dsc->line_buf_depth = bpc + 1;
+	dsc->mux_word_size = bpc > 10 ? DSC_MUX_WORD_SIZE_12_BPC: DSC_MUX_WORD_SIZE_8_10_BPC;
 
-	if (bpc == 8) {
-		dsc->flatness_min_qp = 3;
-		dsc->flatness_max_qp = 12;
-		dsc->rc_quant_incr_limit0 = 11;
-		dsc->rc_quant_incr_limit1 = 11;
-		dsc->mux_word_size = DSC_MUX_WORD_SIZE_8_10_BPC;
-	} else if (bpc == 10) { /* 10bpc */
-		dsc->flatness_min_qp = 7;
-		dsc->flatness_max_qp = 16;
-		dsc->rc_quant_incr_limit0 = 15;
-		dsc->rc_quant_incr_limit1 = 15;
-		dsc->mux_word_size = DSC_MUX_WORD_SIZE_8_10_BPC;
-	} else { /* 12 bpc */
-		dsc->flatness_min_qp = 11;
-		dsc->flatness_max_qp = 20;
-		dsc->rc_quant_incr_limit0 = 19;
-		dsc->rc_quant_incr_limit1 = 19;
-		dsc->mux_word_size = DSC_MUX_WORD_SIZE_12_BPC;
-	}
-	if ((dsc->dsc_version_minor == 0x2) && (dsc->native_420)) {
-		dsc->second_line_bpg_offset = 12;
-		dsc->second_line_offset_adj = 512;
-		dsc->nsl_bpg_offset = 2048 *
-			(DIV_ROUND_UP(dsc->second_line_bpg_offset,
-				(dsc->slice_height - 1)));
-	}
+	if ((dsc->dsc_version_minor == 0x2) && (dsc->native_420))
+		dsc->nsl_bpg_offset = (2048 * (DIV_ROUND_UP(dsc->second_line_bpg_offset,
+				(dsc->slice_height - 1))));
 
 	groups_per_line = DIV_ROUND_UP(dsc->slice_width, 3);