@@ -2452,16 +2452,13 @@ static void ov5640_power(struct ov5640_dev *sensor, bool enable)
static void ov5640_powerup_sequence(struct ov5640_dev *sensor)
{
if (sensor->pwdn_gpio) {
- gpiod_set_value_cansleep(sensor->reset_gpio, 0);
+ gpiod_set_value_cansleep(sensor->reset_gpio, 1);
/* camera power cycle */
ov5640_power(sensor, false);
- usleep_range(5000, 10000);
+ usleep_range(5000, 10000); /* t2 */
ov5640_power(sensor, true);
- usleep_range(5000, 10000);
-
- gpiod_set_value_cansleep(sensor->reset_gpio, 1);
- usleep_range(1000, 2000);
+ usleep_range(1000, 2000); /* t3 */
gpiod_set_value_cansleep(sensor->reset_gpio, 0);
} else {
@@ -2469,7 +2466,7 @@ static void ov5640_powerup_sequence(struct ov5640_dev *sensor)
ov5640_write_reg(sensor, OV5640_REG_SYS_CTRL0,
OV5640_REG_SYS_CTRL0_SW_RST);
}
- usleep_range(20000, 25000);
+ usleep_range(20000, 25000); /* t4 */
/*
* software standby: allows registers programming;
The initial state of RESETB input signal of OV5640 should be asserted, i.e. the sensor should be in reset. This is not the case, make it so. Since the subsequent assertion of RESETB signal is no longer necessary and the timing of the power sequencing could be slightly adjusted, add annotations to the delays which match OV5640 datasheet rev. 2.03, both: figure 2-3 power up timing with internal DVDD figure 2-4 power up timing with external DVDD source The 5..10ms delay between PWDN assertion and RESETB assertion is not even documented in the power sequencing diagram, and with this reset fix, it is no longer even necessary. Fixes: 19a81c1426c1 ("[media] add Omnivision OV5640 sensor driver") Reported-by: Jacopo Mondi <jacopo.mondi@ideasonboard.com> Signed-off-by: Marek Vasut <marex@denx.de> --- Cc: Hans Verkuil <hverkuil-cisco@xs4all.nl> Cc: Jacopo Mondi <jacopo.mondi@ideasonboard.com> Cc: Mauro Carvalho Chehab <mchehab@kernel.org> Cc: Sakari Ailus <sakari.ailus@linux.intel.com> Cc: Steve Longerbeam <slongerbeam@gmail.com> Cc: linux-media@vger.kernel.org --- drivers/media/i2c/ov5640.c | 11 ++++------- 1 file changed, 4 insertions(+), 7 deletions(-)