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Subject: Re: [PATCH 09/16] media: vimc: cap: Add multiplanar formats
To:     =?UTF-8?Q?Andr=c3=a9_Almeida?= <andrealmeid@collabora.com>,
        linux-media@vger.kernel.org
Cc:     mchehab@kernel.org, hverkuil@xs4all.nl, lucmaga@gmail.com,
        linux-kernel@vger.kernel.org, kernel@collabora.com
References: <20190315164359.626-1-andrealmeid@collabora.com>
 <20190315164359.626-10-andrealmeid@collabora.com>
From:   Helen Koike <helen.koike@collabora.com>
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Message-ID: <c0bef649-0ea6-49e5-d0e7-77584034ca3a@collabora.com>
Date:   Fri, 15 Mar 2019 16:31:28 -0300
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Sender: linux-kernel-owner@vger.kernel.org
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On 3/15/19 1:43 PM, André Almeida wrote:
> Add multiplanar formats to be exposed to the userspace as
> supported formats. Since we don't want to support multiplanar
> formats when the driver is in singleplanar mode, we only access
> the multiplanar formats array if the multiplanar mode is enabled.
> 
> Signed-off-by: André Almeida <andrealmeid@collabora.com>
> ---
>  drivers/media/platform/vimc/vimc-capture.c | 30 ++++++++++++++++++++--
>  1 file changed, 28 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/media/platform/vimc/vimc-capture.c b/drivers/media/platform/vimc/vimc-capture.c
> index 09a8fd618b12..2d668012e9e9 100644
> --- a/drivers/media/platform/vimc/vimc-capture.c
> +++ b/drivers/media/platform/vimc/vimc-capture.c
> @@ -54,6 +54,19 @@ static const u32 vimc_cap_supported_pixfmt[] = {
>  	V4L2_PIX_FMT_SRGGB12,
>  };
>  
> +static const u32 vimc_cap_supported_pixfmt_mp[] = {
> +	V4L2_PIX_FMT_YUV420M,
> +	V4L2_PIX_FMT_YVU420M,
> +	V4L2_PIX_FMT_YUV422M,
> +	V4L2_PIX_FMT_YVU422M,
> +	V4L2_PIX_FMT_YUV444M,
> +	V4L2_PIX_FMT_YVU444M,
> +	V4L2_PIX_FMT_NV12M,
> +	V4L2_PIX_FMT_NV21M,
> +	V4L2_PIX_FMT_NV16M,
> +	V4L2_PIX_FMT_NV61M,
> +};
> +
>  struct vimc_cap_device {
>  	struct vimc_ent_device ved;
>  	struct video_device vdev;
> @@ -153,13 +166,26 @@ static int vimc_cap_try_fmt_vid_cap(struct file *file, void *priv,
>  				format->width, format->height);
>  }
>  
> +/**
> + * When multiplanar is true, consider that the vimc_cap_enum_fmt_vid_cap_mp
> + * is concantenate in the vimc_cap_enum_fmt_vid_cap array. Otherwise, just
> + * consider the single-planar array
> + */
>  static int vimc_cap_enum_fmt_vid_cap(struct file *file, void *priv,
>  				     struct v4l2_fmtdesc *f)
>  {
> -	if (f->index >= ARRAY_SIZE(vimc_cap_supported_pixfmt))
> +	const unsigned int sp_size = ARRAY_SIZE(vimc_cap_supported_pixfmt);
> +	const unsigned int mp_size = ARRAY_SIZE(vimc_cap_supported_pixfmt_mp);
> +
> +	if (f->index >= sp_size + (multiplanar ? mp_size : 0))
>  		return -EINVAL;
>  
> -	f->pixelformat = vimc_cap_supported_pixfmt[f->index];
> +	if (f->index >= sp_size)
> +		f->pixelformat = vimc_cap_supported_pixfmt_mp[f->index -
> +							      sp_size];

I think it would be better if you break the line like this:

		f->pixelformat =
			vimc_cap_supported_pixfmt_mp[f->index - sp_size];

but this is a matter of style.

Regards,
Helen

> +	else
> +		f->pixelformat = vimc_cap_supported_pixfmt[f->index];
> +
>  	strncpy(f->description, v4l2_get_fourcc_name(f->pixelformat), 4);
>  	f->description[4] = '\0';
>  
>