* [PATCH] media: i2c: ov5640: Fix post-reset delay
@ 2019-01-30 16:48 Loic Poulain
0 siblings, 0 replies; only message in thread
From: Loic Poulain @ 2019-01-30 16:48 UTC (permalink / raw)
To: slongerbeam, mchehab; +Cc: linux-media, Loic Poulain
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>
---
drivers/media/i2c/ov5640.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/media/i2c/ov5640.c b/drivers/media/i2c/ov5640.c
index 5a909ab..6415231 100644
--- a/drivers/media/i2c/ov5640.c
+++ b/drivers/media/i2c/ov5640.c
@@ -1906,7 +1906,7 @@ 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)
--
2.7.4
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2019-01-30 16:48 [PATCH] media: i2c: ov5640: Fix post-reset delay Loic Poulain
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