drm: msm: dp: Fix DSC and FEC handling

Ensure that the driver is handling DSC and FEC
enablement properly. FEC can now be independently
enabled without DSC. FEC configuration is also
now performed after link training in order to
avoid link training failures as per the DP spec.
Consequently, DSC can now be left on during
compliance testing. For DSC use-cases, ensure
that the minimum supported bpp is set to 24, as
required by the DSC spec.

CRs-Fixed: 2517994
Change-Id: I40339585da5b4e51251a3be7119b6959954954d7
Signed-off-by: Fuad Hossain <fhossain@codeaurora.org>

msm/dp/dp_display.c

@@ -884,7 +884,7 @@ static int dp_display_process_hpd_high(struct dp_display_private *dp)
 	dp_display_process_mst_hpd_high(dp, false);
 
 	rc = dp->ctrl->on(dp->ctrl, dp->mst.mst_active,
-				dp->panel->fec_en, false);
+			dp->panel->fec_en, dp->panel->dsc_en, false);
 	if (rc) {
 		dp_display_state_remove(DP_STATE_CONNECTED);
 		goto end;
@@ -1665,7 +1665,8 @@ static int dp_display_prepare(struct dp_display *dp_display, void *panel)
 	 * So, we execute in shallow mode here to do only minimal
 	 * and required things.
 	 */
-	rc = dp->ctrl->on(dp->ctrl, dp->mst.mst_active, dp_panel->fec_en, true);
+	rc = dp->ctrl->on(dp->ctrl, dp->mst.mst_active, dp_panel->fec_en,
+			dp_panel->dsc_en, true);
 	if (rc)
 		goto end;