Commit d7ff6913 authored by Jai Luthra's avatar Jai Luthra Committed by Mauro Carvalho Chehab

media: ov5640: Handle delays when no reset_gpio set

Some module manufacturers [1][2] don't expose the RESETB and PWDN pins
of the sensor directly through the 15-pin FFC connector. Instead wiring
~PWDN gpio to the sensor pins with appropriate delays.

In such cases, reset_gpio will not be available to the driver, but it
will still be toggled when the sensor is powered on, and thus we should
still honor the wait time of >= 5ms + 1ms + 20ms (see figure 2-3 in [3])
before attempting any i/o operations over SCCB.

Also, rename the function to ov5640_powerup_sequence to better match the
datasheet (section 2.7).

[1] https://digilent.com/reference/_media/reference/add-ons/pcam-5c/pcam_5c_sch.pdf
[2] https://www.alinx.com/public/upload/file/AN5641_User_Manual.pdf
[3] https://cdn.sparkfun.com/datasheets/Sensors/LightImaging/OV5640_datasheet.pdf

Fixes: 19a81c14 ("[media] add Omnivision OV5640 sensor driver")
Reported-by: default avatarNishanth Menon <nm@ti.com>
Signed-off-by: default avatarJai Luthra <j-luthra@ti.com>
Reviewed-by: default avatarJacopo Mondi <jacopo.mondi@ideasonboard.com>
Signed-off-by: default avatarSakari Ailus <sakari.ailus@linux.intel.com>
Signed-off-by: default avatarMauro Carvalho Chehab <mchehab@kernel.org>
parent decea0a9
...@@ -2436,11 +2436,22 @@ static void ov5640_power(struct ov5640_dev *sensor, bool enable) ...@@ -2436,11 +2436,22 @@ static void ov5640_power(struct ov5640_dev *sensor, bool enable)
gpiod_set_value_cansleep(sensor->pwdn_gpio, enable ? 0 : 1); gpiod_set_value_cansleep(sensor->pwdn_gpio, enable ? 0 : 1);
} }
static void ov5640_reset(struct ov5640_dev *sensor) /*
* From section 2.7 power up sequence:
* t0 + t1 + t2 >= 5ms Delay from DOVDD stable to PWDN pull down
* t3 >= 1ms Delay from PWDN pull down to RESETB pull up
* t4 >= 20ms Delay from RESETB pull up to SCCB (i2c) stable
*
* Some modules don't expose RESETB/PWDN pins directly, instead providing a
* "PWUP" GPIO which is wired through appropriate delays and inverters to the
* pins.
*
* In such cases, this gpio should be mapped to pwdn_gpio in the driver, and we
* should still toggle the pwdn_gpio below with the appropriate delays, while
* the calls to reset_gpio will be ignored.
*/
static void ov5640_powerup_sequence(struct ov5640_dev *sensor)
{ {
if (!sensor->reset_gpio)
return;
if (sensor->pwdn_gpio) { if (sensor->pwdn_gpio) {
gpiod_set_value_cansleep(sensor->reset_gpio, 0); gpiod_set_value_cansleep(sensor->reset_gpio, 0);
...@@ -2489,8 +2500,7 @@ static int ov5640_set_power_on(struct ov5640_dev *sensor) ...@@ -2489,8 +2500,7 @@ static int ov5640_set_power_on(struct ov5640_dev *sensor)
goto xclk_off; goto xclk_off;
} }
ov5640_reset(sensor); ov5640_powerup_sequence(sensor);
ov5640_power(sensor, true);
ret = ov5640_init_slave_id(sensor); ret = ov5640_init_slave_id(sensor);
if (ret) if (ret)
......
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