linux-kernel - Re: [Outreachy kernel] Re: [PATCH 1/2] media: zoran: add spaces around '<<'

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Date:   Fri, 9 Apr 2021 17:29:37 +0200 (CEST)
From:   Julia Lawall <julia.lawall@...ia.fr>
To:     Mitali Borkar <mitaliborkar810@...il.com>
cc:     Hans Verkuil <hverkuil@...all.nl>, clabbe@...libre.com,
        mchehab@...nel.org, gregkh@...uxfoundation.org,
        linux-media@...r.kernel.org, linux-staging@...ts.linux.dev,
        linux-kernel@...r.kernel.org, outreachy-kernel@...glegroups.com,
        mitali_s@...iitr.ac.in
Subject: Re: [Outreachy kernel] Re: [PATCH 1/2] media: zoran: add spaces
 around '<<'



On Fri, 9 Apr 2021, Mitali Borkar wrote:

> On Fri, Apr 09, 2021 at 09:23:22AM +0200, Hans Verkuil wrote:
> > Hi Mitali,
> >
> > On 08/04/2021 22:38, Mitali Borkar wrote:
> > > Added spaces around '<<' operator to improve readability and meet linux
> > > kernel coding style.
> > > Reported by checkpatch
> > >
> > > Signed-off-by: Mitali Borkar <mitaliborkar810@...il.com>
> > > ---
> > >  drivers/staging/media/zoran/zr36057.h | 14 +++++++-------
> > >  1 file changed, 7 insertions(+), 7 deletions(-)
> > >
> > > diff --git a/drivers/staging/media/zoran/zr36057.h b/drivers/staging/media/zoran/zr36057.h
> > > index 71b651add35a..a2a75fd9f535 100644
> > > --- a/drivers/staging/media/zoran/zr36057.h
> > > +++ b/drivers/staging/media/zoran/zr36057.h
> > > @@ -30,13 +30,13 @@
> > >  #define ZR36057_VFESPFR_HOR_DCM          14
> > >  #define ZR36057_VFESPFR_VER_DCM          8
> > >  #define ZR36057_VFESPFR_DISP_MODE        6
> > > -#define ZR36057_VFESPFR_YUV422          (0<<3)
> > > -#define ZR36057_VFESPFR_RGB888          (1<<3)
> > > -#define ZR36057_VFESPFR_RGB565          (2<<3)
> > > -#define ZR36057_VFESPFR_RGB555          (3<<3)
> > > -#define ZR36057_VFESPFR_ERR_DIF          (1<<2)
> > > -#define ZR36057_VFESPFR_PACK24          (1<<1)
> > > -#define ZR36057_VFESPFR_LITTLE_ENDIAN    (1<<0)
> > > +#define ZR36057_VFESPFR_YUV422          (0 << 3)
> > > +#define ZR36057_VFESPFR_RGB888          (1 << 3)
> > > +#define ZR36057_VFESPFR_RGB565          (2 << 3)
> > > +#define ZR36057_VFESPFR_RGB555          (3 << 3)
> > > +#define ZR36057_VFESPFR_ERR_DIF          (1 << 2)
> > > +#define ZR36057_VFESPFR_PACK24          (1 << 1)
> > > +#define ZR36057_VFESPFR_LITTLE_ENDIAN    (1 << 0)
> > >
> > >  #define ZR36057_VDTR            0x00c	/* Video Display "Top" Register */
> > >
> > >
> >
> > I looked at that header and it is very messy.
> >
> > Can you make two new patches? The first aligns every nicely, e.g. this:
> >
> > #define ZR36057_VFEHCR          0x000   /* Video Front End, Horizontal Configuration Register */
> > #define ZR36057_VFEHCR_HS_POL             BIT(30)
> > #define ZR36057_VFEHCR_H_START           10
> > #define ZR36057_VFEHCR_H_END            0
> > #define ZR36057_VFEHCR_HMASK            0x3ff
> >
> > should become:
> >
> > /* Video Front End, Horizontal Configuration Register */
> > #define ZR36057_VFEHCR			0x000
> > #define ZR36057_VFEHCR_HS_POL		BIT(30)
> > #define ZR36057_VFEHCR_H_START		10
> > #define ZR36057_VFEHCR_H_END		0
> > #define ZR36057_VFEHCR_HMASK		0x3ff
> >
> > Same for all the other register blocks. Use tabs to do the alignment
> > instead of spaces, as is currently the case.
> >
> Okay Sir, will do this.
>
> > The second patch can replace the (0<<3) etc. to BIT(0).
> >
> Sir may I know how to write (2<<3) in BIT() form? Like I am still
> learning and not sure how to convert this. Should it be BIT(2)? But this
> is only possible for (1<<nr), PLease help me out.

I think that you are correct.  BIT is not usable her.

julia

>
> Thanks.
>
> > That would be a nice cleanup of this rather messy header.
> >
> > Thanks!
> >
> > 	Hans
>
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