disp: msm: dp: set DSC capabilities in mode only if panel supports DSC

During mode validation, DSC book-keeping logic is executed irrespective
of the panel DSC status. If the DSC blocks are available then the
corresponding mode is also set as DSC capable. This step is uncalled for
in a non-DSC panel scenario and might lead to unexpected behavior. This
change checks for panel DSC status before updating DSC book-keeping and
capability for the mode.

Change-Id: I30d6a4d7f3e772b7b13fcca6e318e96372a8becb
Signed-off-by: Sandeep Gangadharaiah <quic_sandgang@quicinc.com>

msm/dp/dp_display.c

@@ -3052,37 +3052,38 @@ static void dp_display_convert_to_dp_mode(struct dp_display *dp_display,
 
 	memset(dp_mode, 0, sizeof(*dp_mode));
 
-	free_dsc_blks = dp_display->max_dsc_count -
+	if (dp_panel->dsc_en) {
+		free_dsc_blks = dp_display->max_dsc_count -
 				dp->tot_dsc_blks_in_use +
 				dp_panel->dsc_blks_in_use;
-	DP_DEBUG_V("Before: in_use:%d, max:%d, free:%d\n",
+		DP_DEBUG_V("Before: in_use:%d, max:%d, free:%d\n",
 				dp->tot_dsc_blks_in_use,
 				dp_display->max_dsc_count, free_dsc_blks);
 
-	rc = msm_get_dsc_count(dp->priv, drm_mode->hdisplay,
-			&required_dsc_blks);
-	if (rc) {
-		DP_ERR("error getting dsc count. rc:%d\n", rc);
-		return;
-	}
+		rc = msm_get_dsc_count(dp->priv, drm_mode->hdisplay,
+				&required_dsc_blks);
+		if (rc) {
+			DP_ERR("error getting dsc count. rc:%d\n", rc);
+			return;
+		}
 
-	curr_dsc = dp_panel->dsc_blks_in_use;
-	dp->tot_dsc_blks_in_use -= dp_panel->dsc_blks_in_use;
-	dp_panel->dsc_blks_in_use = 0;
+		curr_dsc = dp_panel->dsc_blks_in_use;
+		dp->tot_dsc_blks_in_use -= dp_panel->dsc_blks_in_use;
+		dp_panel->dsc_blks_in_use = 0;
 
-	if (free_dsc_blks >= required_dsc_blks) {
-		dp_mode->capabilities |= DP_PANEL_CAPS_DSC;
-		new_dsc = max(curr_dsc, required_dsc_blks);
-		dp_panel->dsc_blks_in_use = new_dsc;
-		dp->tot_dsc_blks_in_use += new_dsc;
-	}
+		if (free_dsc_blks >= required_dsc_blks) {
+			dp_mode->capabilities |= DP_PANEL_CAPS_DSC;
+			new_dsc = max(curr_dsc, required_dsc_blks);
+			dp_panel->dsc_blks_in_use = new_dsc;
+			dp->tot_dsc_blks_in_use += new_dsc;
+		}
 
-	if (dp_mode->capabilities & DP_PANEL_CAPS_DSC)
 		DP_DEBUG_V("After: in_use:%d, max:%d, free:%d, req:%d, caps:0x%x\n",
 				dp->tot_dsc_blks_in_use,
 				dp_display->max_dsc_count,
 				free_dsc_blks, required_dsc_blks,
 				dp_mode->capabilities);
+	}
 
 	dp_panel->convert_to_dp_mode(dp_panel, drm_mode, dp_mode);
 }