4.19-stable review patch. If anyone has any objections, please let me know.
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From: Loic Poulain loic.poulain@linaro.org
commit 1d4c41f3d887bcd66e82cb2fda124533dad8808a upstream.
According to the ov5640 specification (2.7 power up sequence), host can access the sensor's registers 20ms after reset. Trying to access them before leads to undefined behavior and result in sporadic initialization errors.
Signed-off-by: Loic Poulain loic.poulain@linaro.org Signed-off-by: Sakari Ailus sakari.ailus@linux.intel.com Signed-off-by: Mauro Carvalho Chehab mchehab+samsung@kernel.org Cc: Adam Ford aford173@gmail.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org
--- drivers/media/i2c/ov5640.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
--- a/drivers/media/i2c/ov5640.c +++ b/drivers/media/i2c/ov5640.c @@ -1759,7 +1759,7 @@ static void ov5640_reset(struct ov5640_d usleep_range(1000, 2000);
gpiod_set_value_cansleep(sensor->reset_gpio, 0); - usleep_range(5000, 10000); + usleep_range(20000, 25000); }
static int ov5640_set_power_on(struct ov5640_dev *sensor)