Messages in this thread | | | Subject | Re: [PATCH v3 11/19] media: i2c: rdacm21: Add dealy after OV490 reset | From | Kieran Bingham <> | Date | Fri, 19 Mar 2021 16:49:44 +0000 |
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Hi Jacopo,
s/dealy/delay/ in $SUBJECT
On 19/03/2021 16:41, Jacopo Mondi wrote: > 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);
Aha, for a second there I thought the comment meant it had to be asserted for 250 uS before clearing it again. But it's 250 uS before using the OV490.
Perhaps possible to update the comment a little, but nothing that matters.
Reviewed-by: Kieran Bingham <kieran.bingham+renesas@ideasonboard.com>
> ret = max9271_configure_gmsl_link(&dev->serializer); > if (ret) >
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