Re: [PATCH v2 1/4] media: staging: rkisp1: cap: change RGB24 format to XBGR32

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Hi Dafna,

On 5/15/20 11:29 AM, Dafna Hirschfeld wrote:
> According to the TRM, the YUV->RGB conversion outputs
> "24 bit word". What it means is that 4 bytes are used with
> 24bit for the RGB and the last byte is ignored.
> This matches format V4L2_PIX_FMT_XBGR32.

I would just improve this a bit, since you only mention the number of bytes, but
doesn't mention why the colors are swapped.

My suggestion:

According to the TRM, the YUV->RGB conversion outputs RGB 888 format
with 4 bytes, where the last byte is ignored, using big endian representation:

________________________________
|___X___|___R___|___G___|___B___|
31      24      16      8       0

Which matches format V4L2_PIX_FMT_XBGR32 in little endian representation, so
replace it accordingly.


With this clarification:

Acked-by: Helen Koike <helen.koike@xxxxxxxxxxxxx>

Thanks,
Helen

> 
> Signed-off-by: Dafna Hirschfeld <dafna.hirschfeld@xxxxxxxxxxxxx>
> ---
>  drivers/staging/media/rkisp1/rkisp1-capture.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/staging/media/rkisp1/rkisp1-capture.c b/drivers/staging/media/rkisp1/rkisp1-capture.c
> index f69235f82c45..61b9ebe577b2 100644
> --- a/drivers/staging/media/rkisp1/rkisp1-capture.c
> +++ b/drivers/staging/media/rkisp1/rkisp1-capture.c
> @@ -276,7 +276,7 @@ static const struct rkisp1_capture_fmt_cfg rkisp1_sp_fmts[] = {
>  	},
>  	/* rgb */
>  	{
> -		.fourcc = V4L2_PIX_FMT_RGB24,
> +		.fourcc = V4L2_PIX_FMT_XBGR32,
>  		.write_format = RKISP1_MI_CTRL_SP_WRITE_PLA,
>  		.output_format = RKISP1_MI_CTRL_SP_OUTPUT_RGB888,
>  	}, {
> 



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