linux-kernel - Re: [RFC PATCH 4/8] media: hantro: postproc: Fix buffer size calculation

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Date:   Sun, 3 Apr 2022 21:16:23 -0300
From:   Ezequiel Garcia <ezequiel@...guardiasur.com.ar>
To:     Jernej Skrabec <jernej.skrabec@...il.com>
Cc:     p.zabel@...gutronix.de, mchehab@...nel.org, nicolas@...fresne.ca,
        hverkuil-cisco@...all.nl, gregkh@...uxfoundation.org,
        wens@...e.org, samuel@...lland.org, linux-media@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-rockchip@...ts.infradead.org,
        linux-staging@...ts.linux.dev,
        linux-arm-kernel@...ts.infradead.org, linux-sunxi@...ts.linux.dev
Subject: Re: [RFC PATCH 4/8] media: hantro: postproc: Fix buffer size
 calculation

Hi Jernej,

On Sun, Feb 27, 2022 at 03:49:22PM +0100, Jernej Skrabec wrote:
> When allocating aux buffers for postprocessing, it's assumed that base
> buffer size is the same as that of output. Coincidentally, that's true
> most of the time, but not always. 10-bit source also needs aux buffer
> size which is appropriate for 10-bit native format, even if the output
> format is 8-bit. Similarly, mv sizes and other extra buffer size also
> depends on source width/height, not destination.
> 
> Signed-off-by: Jernej Skrabec <jernej.skrabec@...il.com>
> ---
>  .../staging/media/hantro/hantro_postproc.c    | 24 +++++++++++++------
>  drivers/staging/media/hantro/hantro_v4l2.c    |  2 +-
>  drivers/staging/media/hantro/hantro_v4l2.h    |  2 ++
>  3 files changed, 20 insertions(+), 8 deletions(-)
> 
> diff --git a/drivers/staging/media/hantro/hantro_postproc.c b/drivers/staging/media/hantro/hantro_postproc.c
> index 248abe5423f0..1a76628d5754 100644
> --- a/drivers/staging/media/hantro/hantro_postproc.c
> +++ b/drivers/staging/media/hantro/hantro_postproc.c
> @@ -12,6 +12,7 @@
>  #include "hantro_hw.h"
>  #include "hantro_g1_regs.h"
>  #include "hantro_g2_regs.h"
> +#include "hantro_v4l2.h"
>  
>  #define HANTRO_PP_REG_WRITE(vpu, reg_name, val) \
>  { \
> @@ -137,18 +138,27 @@ int hantro_postproc_alloc(struct hantro_ctx *ctx)
>  	struct v4l2_m2m_ctx *m2m_ctx = ctx->fh.m2m_ctx;
>  	struct vb2_queue *cap_queue = &m2m_ctx->cap_q_ctx.q;
>  	unsigned int num_buffers = cap_queue->num_buffers;
> +	struct v4l2_pix_format_mplane pix_mp;
> +	const struct hantro_fmt *fmt;
>  	unsigned int i, buf_size;
>  
> -	buf_size = ctx->dst_fmt.plane_fmt[0].sizeimage;
> +	/* this should always pick native format */
> +	fmt = hantro_get_default_fmt(ctx, false);
> +	if (!fmt)
> +		return -EINVAL;
> +	v4l2_fill_pixfmt_mp(&pix_mp, fmt->fourcc, ctx->src_fmt.width,
> +			    ctx->src_fmt.height);
> +
> +	buf_size = pix_mp.plane_fmt[0].sizeimage;

Took me a while to see that the main change is taking buf_size
from pix_mp, which now takes into account the bit-depth :)

To me this makes sense.

Reviewed-by: Ezequiel Garcia <ezequiel@...guardiasur.com.ar>

Thanks,
Ezequiel