6.6-stable review patch. If anyone has any objections, please let me know.
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From: Naushir Patuck naush@raspberrypi.com
commit 57d10bcac67707caaa542e09dee86e13ea85defc upstream.
Add a 2-5ms delay when coming out of standby and before reading the sensor info register durning probe, as instructed by the datasheet. This standby delay is already present when the sensor starts streaming.
During a cold-boot, reading the IMX296_SENSOR_INFO register would often return a value of 0x0000, if this delay is not present before.
Fixes: cb33db2b6ccf ("media: i2c: IMX296 camera sensor driver") Cc: stable@vger.kernel.org Tested-by: Alexandru Ardelean aardelean@baylibre.com Signed-off-by: Naushir Patuck naush@raspberrypi.com Reviewed-by: Kieran Bingham kieran.bingham@ideasonboard.com Reviewed-by: Laurent Pinchart laurent.pinchart@ideasonboard.com Signed-off-by: Sakari Ailus sakari.ailus@linux.intel.com Signed-off-by: Mauro Carvalho Chehab mchehab+huawei@kernel.org Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/media/i2c/imx296.c | 2 ++ 1 file changed, 2 insertions(+)
--- a/drivers/media/i2c/imx296.c +++ b/drivers/media/i2c/imx296.c @@ -960,6 +960,8 @@ static int imx296_identify_model(struct return ret; }
+ usleep_range(2000, 5000); + ret = imx296_read(sensor, IMX296_SENSOR_INFO); if (ret < 0) { dev_err(sensor->dev, "failed to read sensor information (%d)\n",