linux-kernel - Re: [PATCH v5 3/3] [media] s5p-mfc: Check and set 'v4l2_pix_format:field' field in try

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Date:   Wed, 22 Feb 2017 09:42:25 -0500
From:   Nicolas Dufresne <nicolas.dufresne@...labora.com>
To:     Thibault Saunier <thibault.saunier@....samsung.com>,
        Andrzej Hajda <a.hajda@...sung.com>,
        linux-kernel@...r.kernel.org
Cc:     Mauro Carvalho Chehab <mchehab@...nel.org>,
        Marek Szyprowski <m.szyprowski@...sung.com>,
        Kukjin Kim <kgene@...nel.org>,
        Mauro Carvalho Chehab <mchehab@...pensource.com>,
        Andi Shyti <andi.shyti@...sung.com>,
        linux-media@...r.kernel.org, Shuah Khan <shuahkh@....samsung.com>,
        Javier Martinez Canillas <javier@....samsung.com>,
        linux-samsung-soc@...r.kernel.org,
        Krzysztof Kozlowski <krzk@...nel.org>,
        Inki Dae <inki.dae@...sung.com>,
        Sylwester Nawrocki <s.nawrocki@...sung.com>,
        linux-arm-kernel@...ts.infradead.org,
        Ulf Hansson <ulf.hansson@...aro.org>,
        Jeongtae Park <jtp.park@...sung.com>,
        Kyungmin Park <kyungmin.park@...sung.com>,
        Kamil Debski <kamil@...as.org>
Subject: Re: [PATCH v5 3/3] [media] s5p-mfc: Check and set
 'v4l2_pix_format:field' field in try_fmt

Le mercredi 22 février 2017 à 10:10 -0300, Thibault Saunier a écrit :
> Hello,
> 
> On 02/22/2017 06:29 AM, Andrzej Hajda wrote:
> > On 21.02.2017 20:20, Thibault Saunier wrote:
> > > It is required by the standard that the field order is set by the
> > > driver.
> > > 
> > > Signed-off-by: Thibault Saunier <thibault.saunier@....samsung.com
> > > >
> > > 
> > > ---
> > > 
> > > Changes in v5:
> > > - Just adapt the field and never error out.
> > > 
> > > Changes in v4: None
> > > Changes in v3:
> > > - Do not check values in the g_fmt functions as Andrzej explained
> > > in previous review
> > > 
> > > Changes in v2:
> > > - Fix a silly build error that slipped in while rebasing the
> > > patches
> > > 
> > >   drivers/media/platform/s5p-mfc/s5p_mfc_dec.c | 3 +++
> > >   1 file changed, 3 insertions(+)
> > > 
> > > diff --git a/drivers/media/platform/s5p-mfc/s5p_mfc_dec.c
> > > b/drivers/media/platform/s5p-mfc/s5p_mfc_dec.c
> > > index 0976c3e0a5ce..44ed2afe0780 100644
> > > --- a/drivers/media/platform/s5p-mfc/s5p_mfc_dec.c
> > > +++ b/drivers/media/platform/s5p-mfc/s5p_mfc_dec.c
> > > @@ -386,6 +386,9 @@ static int vidioc_try_fmt(struct file *file,
> > > void *priv, struct v4l2_format *f)
> > >   	struct v4l2_pix_format_mplane *pix_mp = &f->fmt.pix_mp;
> > >   	struct s5p_mfc_fmt *fmt;
> > >   
> > > +	if (f->fmt.pix.field == V4L2_FIELD_ANY)
> > > +		f->fmt.pix.field = V4L2_FIELD_NONE;
> > > +
> > 
> > In previous version the only supported field type was NONE, here
> > you
> > support everything.
> > If the only supported format is none you should set 'field'
> > unconditionally to NONE, nothing more.
> 
> Afaict we  support 2 things:
> 
>    1. NONE
>    2. INTERLACE
> 
> Until now we were not checking what was supported or not and
> basically 
> ignoring that info, this patch
> keeps the old behaviour making sure to be compliant.
> 
> I had a doubt and was pondering doing:
> 
> ``` diff
> 
> +	if (f->fmt.pix.field != V4L2_FIELD_INTERLACED)
> +		f->fmt.pix.field = V4L2_FIELD_NONE;
> +
> 

This looks better to me.

> ```
> 
> instead, it is probably more correct, do you think it is what should
> be 
> done here?
> 
> Regards,
> 
> Thibault
> 
> > 
> > Regards
> > Andrzej
> > 
> > >   	mfc_debug(2, "Type is %d\n", f->type);
> > >   	if (f->type == V4L2_BUF_TYPE_VIDEO_OUTPUT_MPLANE) {
> > >   		fmt = find_format(f, MFC_FMT_DEC);
> 
> 
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