linux-kernel - Re: [PATCH v3 1/7] media: i2c: imx290: Define standby mode values

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Message-ID: <CAJpcXm5uNU7AbLe9BeWa7HT=48evPcM2U+K0qVa6a4MAAEkiOw@mail.gmail.com>
Date: Mon, 2 Sep 2024 22:05:39 +0200
From: Benjamin Bara <bbara93@...il.com>
To: Laurent Pinchart <laurent.pinchart@...asonboard.com>
Cc: Mauro Carvalho Chehab <mchehab@...nel.org>, 
	Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>, 
	Sakari Ailus <sakari.ailus@...ux.intel.com>, Hans de Goede <hdegoede@...hat.com>, 
	Alexander Stein <alexander.stein@...tq-group.com>, linux-media@...r.kernel.org, 
	linux-kernel@...r.kernel.org, Benjamin Bara <benjamin.bara@...data.com>
Subject: Re: [PATCH v3 1/7] media: i2c: imx290: Define standby mode values

Hi Laurent!

Thanks for your feedback!

On Mon, 2 Sept 2024 at 21:56, Laurent Pinchart
<laurent.pinchart@...asonboard.com> wrote:
> On Mon, Sep 02, 2024 at 05:57:26PM +0200, bbara93@...il.com wrote:
> > From: Benjamin Bara <benjamin.bara@...data.com>
> >
> > The imx290 datasheet states that the IMX290_STANDBY register has two
> > values: 0 for operating and 1 for standby. Define and use them.
> >
> > Signed-off-by: Benjamin Bara <benjamin.bara@...data.com>
> > ---
> > Changes since v2:
> > - new, split out from the previous 1/2
> > ---
> >  drivers/media/i2c/imx290.c | 7 +++++--
> >  1 file changed, 5 insertions(+), 2 deletions(-)
> >
> > diff --git a/drivers/media/i2c/imx290.c b/drivers/media/i2c/imx290.c
> > index 4150e6e4b9a6..1c97f9650eb4 100644
> > --- a/drivers/media/i2c/imx290.c
> > +++ b/drivers/media/i2c/imx290.c
> > @@ -29,6 +29,8 @@
> >  #include <media/v4l2-subdev.h>
> >
> >  #define IMX290_STANDBY                                       CCI_REG8(0x3000)
> > +#define IMX290_STANDBY_OPERATING                     0x00
> > +#define IMX290_STANDBY_STANDBY                               BIT(0)
>
> The convention, for single-bit fields, is to define a macro to describe
> the bit, but not a macro to describe the bit not being set.
>
> >  #define IMX290_REGHOLD                                       CCI_REG8(0x3001)
> >  #define IMX290_XMSTA                                 CCI_REG8(0x3002)
> >  #define IMX290_ADBIT                                 CCI_REG8(0x3005)
> > @@ -1016,7 +1018,8 @@ static int imx290_start_streaming(struct imx290 *imx290,
> >               return ret;
> >       }
> >
> > -     cci_write(imx290->regmap, IMX290_STANDBY, 0x00, &ret);
> > +     cci_write(imx290->regmap, IMX290_STANDBY, IMX290_STANDBY_OPERATING,
> > +               &ret);
>
> I would thus rather drop this change.
>
> >
> >       msleep(30);
> >
> > @@ -1029,7 +1032,7 @@ static int imx290_stop_streaming(struct imx290 *imx290)
> >  {
> >       int ret = 0;
> >
> > -     cci_write(imx290->regmap, IMX290_STANDBY, 0x01, &ret);
> > +     cci_write(imx290->regmap, IMX290_STANDBY, IMX290_STANDBY_STANDBY, &ret);
>
> And keep this one.
>
> >
> >       msleep(30);
> >

Thanks, will do in the next version.

Kind regards
Benjamin

>
> --
> Regards,
>
> Laurent Pinchart