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    Subject[PATCH 3.16 040/132] media: ov6650: Fix sensor possibly not detected on probe
    3.16.74-rc1 review patch.  If anyone has any objections, please let me know.

    ------------------

    From: Janusz Krzysztofik <jmkrzyszt@gmail.com>

    commit 933c1320847f5ed6b61a7d10f0a948aa98ccd7b0 upstream.

    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>
    Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>
    Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>
    [bwh: Backported to 3.16: adjust filename]
    Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
    ---
    drivers/media/i2c/soc_camera/ov6650.c | 2 ++
    1 file changed, 2 insertions(+)

    --- a/drivers/media/i2c/soc_camera/ov6650.c
    +++ b/drivers/media/i2c/soc_camera/ov6650.c
    @@ -829,6 +829,8 @@ static int ov6650_video_probe(struct i2c
    if (ret < 0)
    return ret;

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