drm/bridge: anx7625: Set downstream sink into normal status

As downstream sink was set into standby mode while bridge disabled,
this patch used for setting downstream sink into normal status
while enable bridge.
Signed-off-by: NXin Ji <xji@analogixsemi.com>
Reviewed-by: NPin-Yen Lin <treapking@chromium.org>
Signed-off-by: NRobert Foss <robert.foss@linaro.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20220322080213.1487134-1-xji@analogixsemi.com

drivers/gpu/drm/bridge/analogix/anx7625.c

@@ -924,12 +924,20 @@ static void anx7625_dp_start(struct anx7625_data *ctx)
 {
 	int ret;
 	struct device *dev = &ctx->client->dev;
+	u8 data;
 
 	if (!ctx->display_timing_valid) {
 		DRM_DEV_ERROR(dev, "mipi not set display timing yet.\n");
 		return;
 	}
 
+	dev_dbg(dev, "set downstream sink into normal\n");
+	/* Downstream sink enter into normal mode */
+	data = 1;
+	ret = anx7625_aux_trans(ctx, DP_AUX_NATIVE_WRITE, 0x000600, 1, &data);
+	if (ret < 0)
+		dev_err(dev, "IO error : set sink into normal mode fail\n");
+
 	/* Disable HDCP */
 	anx7625_write_and(ctx, ctx->i2c.rx_p1_client, 0xee, 0x9f);