Messages in this thread | | | Subject | Re: [PATCH 2/2] media: rdacm20: Enable GPIO1 explicitly | From | Kieran Bingham <> | Date | Mon, 23 Nov 2020 14:19:23 +0000 |
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Hi Jacopo,
On 20/11/2020 16:15, Jacopo Mondi wrote: > The MAX9271 GPIO1 line that controls the sensor reset is by default > enabled after a serializer chip reset. > > As rdacm20 does not go through an explicit serializer reset, make sure > GPIO1 is enabled to make the camera module driver more robust. > > Fixes: 34009bffc1c6 ("media: i2c: Add RDACM20 driver") > Signed-off-by: Jacopo Mondi <jacopo+renesas@jmondi.org>
Looks helpful to ensure a GPIO is enabled before toggling ;-)
Reading the datasheet, GPIO1EN defaults to enabled, so I assume this was already working - however I think being explicit is a good thing anyway.
Reviewed-by: Kieran Bingham <kieran.bingham+renesas@ideasonboard.com>
> --- > drivers/media/i2c/rdacm20.c | 13 +++++++++++-- > 1 file changed, 11 insertions(+), 2 deletions(-) > > diff --git a/drivers/media/i2c/rdacm20.c b/drivers/media/i2c/rdacm20.c > index 1ed928c4ca70..16bcb764b0e0 100644 > --- a/drivers/media/i2c/rdacm20.c > +++ b/drivers/media/i2c/rdacm20.c > @@ -487,9 +487,18 @@ static int rdacm20_initialize(struct rdacm20_device *dev) > * Reset the sensor by cycling the OV10635 reset signal connected to the > * MAX9271 GPIO1 and verify communication with the OV10635. > */ > - max9271_clear_gpios(dev->serializer, MAX9271_GPIO1OUT); > + ret = max9271_enable_gpios(dev->serializer, MAX9271_GPIO1OUT); > + if (ret) > + return ret; > + > + ret = max9271_clear_gpios(dev->serializer, MAX9271_GPIO1OUT); > + if (ret) > + return ret; > usleep_range(10000, 15000); > - max9271_set_gpios(dev->serializer, MAX9271_GPIO1OUT); > + > + ret = max9271_set_gpios(dev->serializer, MAX9271_GPIO1OUT); > + if (ret) > + return ret; > usleep_range(10000, 15000); > > again: > -- > 2.29.1 >
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