media: i2c: ov5640: Fix post-reset delay

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>

diff --git a/drivers/media/i2c/ov5640.c b/drivers/media/i2c/ov5640.c
index 2387c29b7fb0f87f85c922c94f3f30efc7b22a71..5278c8723fdd5db1459a8f9405f155cdd1052b62 100644 (file)
--- a/drivers/media/i2c/ov5640.c
+++ b/drivers/media/i2c/ov5640.c
@@ -1939,7 +1939,7 @@ static void ov5640_reset(struct ov5640_dev *sensor)
        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)