linux-kernel - Re: [RESEND PATCH v0 4/5] wave5: Use the bitstream buffer size from host.

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Date: Wed, 31 Jan 2024 11:36:50 -0600
From: Andrew Davis <afd@...com>
To: "jackson.lee" <jackson.lee@...psnmedia.com>, <mchehab@...nel.org>,
        <linux-media@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <nas.chung@...psnmedia.com>
CC: <lafley.kim@...psnmedia.com>, <b-brnich@...com>
Subject: Re: [RESEND PATCH v0 4/5] wave5: Use the bitstream buffer size from
 host.

On 1/30/24 7:30 PM, jackson.lee wrote:
> In V4L2 spec, Host can set the bitstream buffer size.
> Allow the larger size between default size and input size.
> 
> Signed-off-by: Jackson Lee <jackson.lee@...psnmedia.com>
> Signed-off-by: Nas Chung <nas.chung@...psnmedia.com>
> ---
>   drivers/media/platform/chips-media/wave5/wave5-vpu-enc.c | 7 ++++++-
>   1 file changed, 6 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/media/platform/chips-media/wave5/wave5-vpu-enc.c b/drivers/media/platform/chips-media/wave5/wave5-vpu-enc.c
> index ff73d69de41c..19018ace41b6 100644
> --- a/drivers/media/platform/chips-media/wave5/wave5-vpu-enc.c
> +++ b/drivers/media/platform/chips-media/wave5/wave5-vpu-enc.c
> @@ -11,6 +11,10 @@
>   #define VPU_ENC_DEV_NAME "C&M Wave5 VPU encoder"
>   #define VPU_ENC_DRV_NAME "wave5-enc"
>   
> +#define DEFAULT_SRC_SIZE(width, height) ({			\
> +	(width) * (height) / 8 * 3;					\

These "\" are tabbed out way to far, and not to the same amount..
Why have this in {;} brackets?
Why multiple lines?
Just:

#define DEFAULT_SRC_SIZE(width, height) ((width) * (height) / 8 * 3)

Andrew

> +})
> +
>   static const struct vpu_format enc_fmt_list[FMT_TYPES][MAX_FMTS] = {
>   	[VPU_FMT_TYPE_CODEC] = {
>   		{
> @@ -193,7 +197,8 @@ static void wave5_update_pix_fmt(struct v4l2_pix_format_mplane *pix_mp, unsigned
>   		pix_mp->width = width;
>   		pix_mp->height = height;
>   		pix_mp->plane_fmt[0].bytesperline = 0;
> -		pix_mp->plane_fmt[0].sizeimage = width * height / 8 * 3;
> +		pix_mp->plane_fmt[0].sizeimage = max(DEFAULT_SRC_SIZE(width, height),
> +						     pix_mp->plane_fmt[0].sizeimage);
>   		break;
>   	}
>   }