[v3,1/3] media: ov5640: Handle delays when no reset_gpio set
Commit Message
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: 19a81c1426c1 ("[media] add Omnivision OV5640 sensor driver")
Signed-off-by: Jai Luthra <j-luthra@ti.com>
Reviewed-by: Jacopo Mondi <jacopo.mondi@ideasonboard.com>
---
drivers/media/i2c/ov5640.c | 22 ++++++++++++++++------
1 file changed, 16 insertions(+), 6 deletions(-)
@@ -2424,11 +2424,22 @@ static void ov5640_power(struct ov5640_dev *sensor, bool enable)
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;
-
gpiod_set_value_cansleep(sensor->reset_gpio, 0);
/* camera power cycle */
@@ -2464,8 +2475,7 @@ static int ov5640_set_power_on(struct ov5640_dev *sensor)
goto xclk_off;
}
- ov5640_reset(sensor);
- ov5640_power(sensor, true);
+ ov5640_powerup_sequence(sensor);
ret = ov5640_init_slave_id(sensor);
if (ret)