disp: msm: dp: fix the dsc line buf bit depth selection for dp dsc

The line buffer bit depth is used as part of dp
dsc calculations. Read the max supported line buf
bit depth supported by sink, and use that
restriction as part of the dsc calculations.

CRs-Fixed: 2325207
Change-Id: I4c995acad5f484edd1b438bdbf6c145b2d35ee41
Signed-off-by: Fuad Hossain <fhossain@codeaurora.org>

msm/dp/dp_panel.c

@@ -1349,7 +1349,7 @@ static void dp_panel_dsc_pclk_param_calc(struct dp_panel *dp_panel,
 }
 
 static void dp_panel_dsc_populate_static_params(
-		struct msm_display_dsc_info *dsc)
+		struct msm_display_dsc_info *dsc, struct dp_panel *panel)
 {
 	int bpp, bpc;
 	int mux_words_size;
@@ -1361,6 +1361,7 @@ static void dp_panel_dsc_populate_static_params(
 	int data;
 	int final_value, final_scale;
 	int ratio_index, mod_offset;
+	int line_buf_depth_raw, line_buf_depth;
 
 	dsc->version = 0x11;
 	dsc->scr_rev = 0;
@@ -1411,7 +1412,10 @@ static void dp_panel_dsc_populate_static_params(
 	else
 		mux_words_size = 48;		/* bpc == 8/10 */
 
-	dsc->line_buf_depth = bpc + 1;
+	line_buf_depth_raw = panel->dsc_dpcd[5] & 0x0f;
+	line_buf_depth = (line_buf_depth_raw == 8) ? 8 :
+			(line_buf_depth_raw + 9);
+	dsc->line_buf_depth = min(line_buf_depth, dsc->bpc + 1);
 
 	if (bpc == 8) {
 		dsc->input_10_bits = 0;
@@ -2894,7 +2898,8 @@ static void dp_panel_convert_to_dp_mode(struct dp_panel *dp_panel,
 			return;
 		}
 
-		dp_panel_dsc_populate_static_params(&comp_info->dsc_info);
+		dp_panel_dsc_populate_static_params(&comp_info->dsc_info,
+				dp_panel);
 		dp_panel_dsc_pclk_param_calc(dp_panel,
 				&comp_info->dsc_info,
 				comp_info->comp_ratio,