linux-kernel - [PATCH AUTOSEL 4.4 28/56] media: ov6650: Fix sensor possibly not detected on probe

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Message-Id: <20190601132600.27427-28-sashal@kernel.org>
Date:   Sat,  1 Jun 2019 09:25:32 -0400
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     Janusz Krzysztofik <jmkrzyszt@...il.com>,
        Sakari Ailus <sakari.ailus@...ux.intel.com>,
        Mauro Carvalho Chehab <mchehab+samsung@...nel.org>,
        Sasha Levin <sashal@...nel.org>, linux-media@...r.kernel.org
Subject: [PATCH AUTOSEL 4.4 28/56] media: ov6650: Fix sensor possibly not detected on probe

From: Janusz Krzysztofik <jmkrzyszt@...il.com>

[ Upstream commit 933c1320847f5ed6b61a7d10f0a948aa98ccd7b0 ]

After removal of clock_start() from before soc_camera_init_i2c() in
soc_camera_probe() by commit 9aea470b399d ("[media] soc-camera: switch
I2C subdevice drivers to use v4l2-clk") introduced in v3.11, the ov6650
driver could no longer probe the sensor successfully because its clock
was no longer turned on in advance.  The issue was initially worked
around by adding that missing clock_start() equivalent to OMAP1 camera
interface driver - the only user of this sensor - but a propoer fix
should be rather implemented in the sensor driver code itself.

Fix the issue by inserting a delay between the clock is turned on and
the sensor I2C registers are read for the first time.

Tested on Amstrad Delta with now out of tree but still locally
maintained omap1_camera host driver.

Fixes: 9aea470b399d ("[media] soc-camera: switch I2C subdevice drivers to use v4l2-clk")

Signed-off-by: Janusz Krzysztofik <jmkrzyszt@...il.com>
Cc: stable@...r.kernel.org
Signed-off-by: Sakari Ailus <sakari.ailus@...ux.intel.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@...nel.org>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/media/i2c/soc_camera/ov6650.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/media/i2c/soc_camera/ov6650.c b/drivers/media/i2c/soc_camera/ov6650.c
index 1e4783b51a351..1e9ebfda25525 100644
--- a/drivers/media/i2c/soc_camera/ov6650.c
+++ b/drivers/media/i2c/soc_camera/ov6650.c
@@ -843,6 +843,8 @@ static int ov6650_video_probe(struct i2c_client *client)
 	if (ret < 0)
 		return ret;

+	msleep(20);
+
 	/*
 	 * check and show product ID and manufacturer ID
 	 */
-- 
2.20.1