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From:   Xin Ji <xji@analogixsemi.com>
To:     Andrzej Hajda <andrzej.hajda@intel.com>,
        Neil Armstrong <narmstrong@baylibre.com>,
        Robert Foss <robert.foss@linaro.org>,
        Laurent Pinchart <Laurent.pinchart@ideasonboard.com>,
        Jonas Karlman <jonas@kwiboo.se>,
        Jernej Skrabec <jernej.skrabec@gmail.com>,
        David Airlie <airlied@linux.ie>,
        Daniel Vetter <daniel@ffwll.ch>
Cc:     bliang@analogixsemi.com, qwen@analogixsemi.com,
        treapking@chromium.org, pihsun@chromium.org, tzungbi@google.com,
        hsinyi@chromium.org, Xin Ji <xji@analogixsemi.com>,
        dri-devel@lists.freedesktop.org, linux-kernel@vger.kernel.org
Subject: [PATCH v2] drm/bridge: anx7625: Set downstream sink into normal status
Date:   Tue, 22 Mar 2022 16:02:12 +0800
Message-Id: <20220322080213.1487134-1-xji@analogixsemi.com>
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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: Xin Ji <xji@analogixsemi.com>
Reviewed-by: Pin-Yen Lin <treapking@chromium.org>

---
V1 -> V2: use dev_dbg replace of dev_info
---
 drivers/gpu/drm/bridge/analogix/anx7625.c | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/drivers/gpu/drm/bridge/analogix/anx7625.c b/drivers/gpu/drm/bridge/analogix/anx7625.c
index 9a2a19ad4202..dcf3275a00fe 100644
--- a/drivers/gpu/drm/bridge/analogix/anx7625.c
+++ b/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);
 
-- 
2.25.1