drm/bridge: it6505: Fix the order of DP_SET_POWER commands

Send DP_SET_POWER_D3 command to the downstream before stopping DP, so the
suspend process will not be interrupted by the HPD interrupt. Also modify
the order in .atomic_enable callback to make the callbacks symmetric.

Fixes: 46ca7da7 ("drm/bridge: it6505: Send DPCD SET_POWER to downstream")
Signed-off-by: Pin-yen Lin <treapking@chromium.org>
Reviewed-by: Robert Foss <robert.foss@linaro.org>
Signed-off-by: Robert Foss <robert.foss@linaro.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20220830045756.1655954-1-treapking@chromium.org

drivers/gpu/drm/bridge/ite-it6505.c

@@ -2951,9 +2951,6 @@ static void it6505_bridge_atomic_enable(struct drm_bridge *bridge,
 	if (ret)
 		dev_err(dev, "Failed to setup AVI infoframe: %d", ret);
 
-	it6505_drm_dp_link_set_power(&it6505->aux, &it6505->link,
-				     DP_SET_POWER_D0);
-
 	it6505_update_video_parameter(it6505, mode);
 
 	ret = it6505_send_video_infoframe(it6505, &frame);
@@ -2963,6 +2960,9 @@ static void it6505_bridge_atomic_enable(struct drm_bridge *bridge,
 
 	it6505_int_mask_enable(it6505);
 	it6505_video_reset(it6505);
+
+	it6505_drm_dp_link_set_power(&it6505->aux, &it6505->link,
+				     DP_SET_POWER_D0);
 }
 
 static void it6505_bridge_atomic_disable(struct drm_bridge *bridge,
@@ -2974,9 +2974,9 @@ static void it6505_bridge_atomic_disable(struct drm_bridge *bridge,
 	DRM_DEV_DEBUG_DRIVER(dev, "start");
 
 	if (it6505->powered) {
-		it6505_video_disable(it6505);
 		it6505_drm_dp_link_set_power(&it6505->aux, &it6505->link,
 					     DP_SET_POWER_D3);
+		it6505_video_disable(it6505);
 	}
 }