drm/amd/display: Add logging when setting DP sink power state fails

Log if we fail to setup sink power states.

Cc: Fangzhi Zuo <Jerry.Zuo@amd.com>
Cc: Aurabindo Pillai <aurabindo.pillai@amd.com>
Signed-off-by: Srinivasan Shanmugam <srinivasan.shanmugam@amd.com>
Reviewed-by: Aurabindo Pillai <aurabindo.pillai@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/display/dc/link/protocols/link_dp_capability.c

@@ -1043,6 +1043,9 @@ static enum dc_status wake_up_aux_channel(struct dc_link *link)
 				DP_SET_POWER,
 				&dpcd_power_state,
 				sizeof(dpcd_power_state));
+		if (status < 0)
+			DC_LOG_DC("%s: Failed to power up sink: %s\n", __func__,
+				  dpcd_power_state == DP_SET_POWER_D0 ? "D0" : "D3");
 		return DC_ERROR_UNEXPECTED;
 	}