drm/amd/display: Add fallback configuration when set DRR

Set OTG/OPTC parameter to 0 if failed to set DRR.
Acked-by: Hamza Mahfooz <hamza.mahfooz@amd.com>
Signed-off-by: Rodrigo Siqueira <Rodrigo.Siqueira@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/display/dc/optc/dcn32/dcn32_optc.c

@@ -293,9 +293,16 @@ static void optc32_set_drr(
 		}
 
 		optc->funcs->set_vtotal_min_max(optc, params->vertical_total_min - 1, params->vertical_total_max - 1);
-	}
+		optc32_setup_manual_trigger(optc);
+	} else {
+		REG_UPDATE_4(OTG_V_TOTAL_CONTROL,
+				OTG_SET_V_TOTAL_MIN_MASK, 0,
+				OTG_V_TOTAL_MIN_SEL, 0,
+				OTG_V_TOTAL_MAX_SEL, 0,
+				OTG_FORCE_LOCK_ON_EVENT, 0);
 
-	optc32_setup_manual_trigger(optc);
+		optc->funcs->set_vtotal_min_max(optc, 0, 0);
+	}
 }
 
 static struct timing_generator_funcs dcn32_tg_funcs = {