Messages in this thread Patch in this message | | | From | Jacopo Mondi <> | Subject | [PATCH v3 11/19] media: i2c: rdacm21: Add dealy after OV490 reset | Date | Fri, 19 Mar 2021 17:41:40 +0100 |
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Add a delay after the OV490 chip is put in reset state. The reset signal shall be held for at least 250 useconds.
Signed-off-by: Jacopo Mondi <jacopo+renesas@jmondi.org> --- drivers/media/i2c/rdacm21.c | 6 +++++- 1 file changed, 5 insertions(+), 1 deletion(-)
diff --git a/drivers/media/i2c/rdacm21.c b/drivers/media/i2c/rdacm21.c index babd14b21252..875bec9f7904 100644 --- a/drivers/media/i2c/rdacm21.c +++ b/drivers/media/i2c/rdacm21.c @@ -448,7 +448,10 @@ static int rdacm21_init(struct v4l2_subdev *sd, unsigned int val) if (ret) return ret; - /* Enable GPIO1 and hold OV490 in reset during max9271 configuration. */ + /* + * Enable GPIO1 and hold OV490 in reset during max9271 configuration. + * The reset signal has to be asserted for at least 250 useconds. + */ ret = max9271_enable_gpios(&dev->serializer, MAX9271_GPIO1OUT); if (ret) return ret; @@ -456,6 +459,7 @@ static int rdacm21_init(struct v4l2_subdev *sd, unsigned int val) ret = max9271_clear_gpios(&dev->serializer, MAX9271_GPIO1OUT); if (ret) return ret; + usleep_range(250, 500); ret = max9271_configure_gmsl_link(&dev->serializer); if (ret) -- 2.30.0
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