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Subject: media: ov6650: Fix sensor possibly not detected on probe Author: Janusz Krzysztofik jmkrzyszt@gmail.com Date: Sun Mar 24 20:21:12 2019 -0400

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@gmail.com Cc: stable@vger.kernel.org Signed-off-by: Sakari Ailus sakari.ailus@linux.intel.com Signed-off-by: Mauro Carvalho Chehab mchehab+samsung@kernel.org

drivers/media/i2c/ov6650.c | 2 ++ 1 file changed, 2 insertions(+)

---

diff --git a/drivers/media/i2c/ov6650.c b/drivers/media/i2c/ov6650.c index c33fd584cb44..f9359b11fa5c 100644 --- a/drivers/media/i2c/ov6650.c +++ b/drivers/media/i2c/ov6650.c @@ -814,6 +814,8 @@ static int ov6650_video_probe(struct i2c_client *client) if (ret < 0) return ret;

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