drm/amd/display: Enable ASSR in DM

This patch enables ASSR if display declares such support in DPCD.
Signed-off-by: Stylon Wang <stylon.wang@amd.com>
Reviewed-by: Rodrigo Siqueira <Rodrigo.Siqueira@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/display/dc/core/dc_link_dp.c

@@ -1669,6 +1669,22 @@ bool perform_link_training_with_retries(
 			msleep(delay_dp_power_up_in_ms);
 		}
 
+#ifdef CONFIG_DRM_AMD_DC_HDCP
+		if (panel_mode == DP_PANEL_MODE_EDP) {
+			struct cp_psp *cp_psp = &stream->ctx->cp_psp;
+
+			if (cp_psp && cp_psp->funcs.enable_assr) {
+				if (!cp_psp->funcs.enable_assr(cp_psp->handle, link)) {
+					/* since eDP implies ASSR on, change panel
+					 * mode to disable ASSR
+					 */
+					panel_mode = DP_PANEL_MODE_DEFAULT;
+				}
+			} else
+				panel_mode = DP_PANEL_MODE_DEFAULT;
+		}
+#endif
+
 		dp_set_panel_mode(link, panel_mode);
 
 		if (link->aux_access_disabled) {