linux-kernel - Re: [PATCH] vimc: debayer: Add support for ARGB format

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Date:   Fri, 29 May 2020 17:43:57 +0200
From:   Dafna Hirschfeld <dafna.hirschfeld@...labora.com>
To:     Kaaira Gupta <kgupta@...iitr.ac.in>,
        Helen Koike <helen.koike@...labora.com>,
        Shuah Khan <skhan@...uxfoundation.org>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        linux-media@...r.kernel.org, linux-kernel@...r.kernel.org,
        kieran.bingham@...asonboard.com,
        dafna Hirschfeld <dafna3@...il.com>
Subject: Re: [PATCH] vimc: debayer: Add support for ARGB format

Hi,
Thanks for the patch

I don't know how real devices handle ARGB formats,
I wonder if it should be the part of the debayer.


On 28.05.20 20:57, Kaaira Gupta wrote:
> Running qcam for pixelformat 0x34324142 showed that vimc debayer does
> not support it. Hence, add the support for Alpha (255).

I would change the commit log to:

Add support for V4L2_PIX_FMT_RGB24 format in the debayer
and set the alpha channel to constant 255.

Thanks,
Dafna

> 
> Signed-off-by: Kaaira Gupta <kgupta@...iitr.ac.in>
> ---
>   .../media/test-drivers/vimc/vimc-debayer.c    | 27 ++++++++++++-------
>   1 file changed, 18 insertions(+), 9 deletions(-)
> 
> diff --git a/drivers/media/test-drivers/vimc/vimc-debayer.c b/drivers/media/test-drivers/vimc/vimc-debayer.c
> index c3f6fef34f68..f34148717a40 100644
> --- a/drivers/media/test-drivers/vimc/vimc-debayer.c
> +++ b/drivers/media/test-drivers/vimc/vimc-debayer.c
> @@ -62,6 +62,7 @@ static const u32 vimc_deb_src_mbus_codes[] = {
>   	MEDIA_BUS_FMT_RGB888_1X7X4_SPWG,
>   	MEDIA_BUS_FMT_RGB888_1X7X4_JEIDA,
>   	MEDIA_BUS_FMT_RGB888_1X32_PADHI,
> +	MEDIA_BUS_FMT_ARGB8888_1X32
>   };
>   
>   static const struct vimc_deb_pix_map vimc_deb_pix_map_list[] = {
> @@ -322,15 +323,23 @@ static void vimc_deb_process_rgb_frame(struct vimc_deb_device *vdeb,
>   	unsigned int i, index;
>   
>   	vpix = vimc_pix_map_by_code(vdeb->src_code);
> -	index = VIMC_FRAME_INDEX(lin, col, vdeb->sink_fmt.width, 3);
> -	for (i = 0; i < 3; i++) {
> -		switch (vpix->pixelformat) {
> -		case V4L2_PIX_FMT_RGB24:
> -			vdeb->src_frame[index + i] = rgb[i];
> -			break;
> -		case V4L2_PIX_FMT_BGR24:
> -			vdeb->src_frame[index + i] = rgb[2 - i];
> -			break;
> +
> +	if (vpix->pixelformat == V4L2_PIX_FMT_ARGB32) {
> +		index =  VIMC_FRAME_INDEX(lin, col, vdeb->sink_fmt.width, 4);
> +		vdeb->src_frame[index] = 255;
> +		for (i = 0; i < 3; i++)
> +			vdeb->src_frame[index + i + 1] = rgb[i];
> +	} else {
> +		index =  VIMC_FRAME_INDEX(lin, col, vdeb->sink_fmt.width, 3);
> +		for (i = 0; i < 3; i++) {
> +			switch (vpix->pixelformat) {
> +			case V4L2_PIX_FMT_RGB24:
> +				vdeb->src_frame[index + i] = rgb[i];
> +				break;
> +			case V4L2_PIX_FMT_BGR24:
> +				vdeb->src_frame[index + i] = rgb[2 - i];
> +				break;
> +			}
>   		}
>   	}
>   }
>