[PATCHv3 11/23] drm/bridge: tc358767: disable only video stream in tc_stream_disable

From: Tomi Valkeinen <tomi.valkeinen@ti.com>
To: Andrzej Hajda <a.hajda@samsung.com>,
	Laurent Pinchart <Laurent.pinchart@ideasonboard.com>,
	Lucas Stach <l.stach@pengutronix.de>,
	Andrey Gusakov <andrey.gusakov@cogentembedded.com>,
	Philipp Zabel <p.zabel@pengutronix.de>,
	Andrey Smirnov <andrew.smirnov@gmail.com>,
	Peter Ujfalusi <peter.ujfalusi@ti.com>,
	Jyri Sarha <jsarha@ti.com>, Benoit Parrot <bparrot@ti.com>,
	dri-devel@lists.freedesktop.org
Cc: Tomi Valkeinen <tomi.valkeinen@ti.com>
Subject: [PATCHv3 11/23] drm/bridge: tc358767: disable only video stream in tc_stream_disable
Date: Fri, 3 May 2019 15:29:37 +0300	[thread overview]
Message-ID: <20190503122949.12266-12-tomi.valkeinen@ti.com> (raw)
In-Reply-To: <20190503122949.12266-1-tomi.valkeinen@ti.com>

Currently the code writes 0 to DP0CTL in tc_stream_disable(), which
disables the whole DP link instead of just the video stream. We always
disable the link and the stream together from tc_bridge_disable(), so
this doesn't cause any issues.

Nevertheless, fix this by only clearing VID_EN in tc_stream_disable to
stop the video stream while keeping the link enabled.

Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ti.com>
---
 drivers/gpu/drm/bridge/tc358767.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/bridge/tc358767.c b/drivers/gpu/drm/bridge/tc358767.c
index b22f5fe7ccfd..86e2e16c5a90 100644
--- a/drivers/gpu/drm/bridge/tc358767.c
+++ b/drivers/gpu/drm/bridge/tc358767.c
@@ -1076,10 +1076,13 @@ static int tc_stream_enable(struct tc_data *tc)
 static int tc_stream_disable(struct tc_data *tc)
 {
 	int ret;
+	u32 val;
 
 	dev_dbg(tc->dev, "disable video stream\n");
 
-	tc_write(DP0CTL, 0);
+	tc_read(DP0CTL, &val);
+	val &= ~VID_EN;
+	tc_write(DP0CTL, val);
 
 	tc_pxl_pll_dis(tc);
 
-- 
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