Hi Jacopo, Thank you for the patch. On Fri, Mar 19, 2021 at 04:49:44PM +0000, Kieran Bingham wrote: > 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@xxxxxxxxxx> > > --- > > 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. The commit message and comment should match the code, especially given that I'm not sure here which of the two is actually incorrect. I suspect the sleep is actually in the wrong location. > Reviewed-by: Kieran Bingham <kieran.bingham+renesas@xxxxxxxxxxxxxxxx> > > > > ret = max9271_configure_gmsl_link(&dev->serializer); > > if (ret) > > -- Regards, Laurent Pinchart
