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 10:29:27 +0100
From:   Andrzej Hajda <a.hajda@...sung.com>
To:     Thibault Saunier <thibault.saunier@....samsung.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>,
        Nicolas Dufresne <nicolas.dufresne@...labora.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

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.

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);