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Date:   Tue, 19 Sep 2023 16:05:40 +0200
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Subject: Re: [PATCH v7 32/49] media: renesas: Stop direct calls to queue
 num_buffers field
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To:     Benjamin Gaignard <benjamin.gaignard@collabora.com>,
        mchehab@kernel.org, tfiga@chromium.org, m.szyprowski@samsung.com,
        ming.qian@nxp.com, ezequiel@vanguardiasur.com.ar,
        p.zabel@pengutronix.de, gregkh@linuxfoundation.org,
        nicolas.dufresne@collabora.com
Cc:     linux-media@vger.kernel.org, linux-kernel@vger.kernel.org,
        linux-arm-kernel@lists.infradead.org,
        linux-mediatek@lists.infradead.org, linux-arm-msm@vger.kernel.org,
        linux-rockchip@lists.infradead.org, linux-staging@lists.linux.dev,
        kernel@collabora.com
References: <20230914133323.198857-1-benjamin.gaignard@collabora.com>
 <20230914133323.198857-33-benjamin.gaignard@collabora.com>
From:   Hans Verkuil <hverkuil-cisco@xs4all.nl>
In-Reply-To: <20230914133323.198857-33-benjamin.gaignard@collabora.com>
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On 14/09/2023 15:33, Benjamin Gaignard wrote:
> Use vb2_get_num_buffers() to avoid using queue num_buffer field directly.
> 
> Signed-off-by: Benjamin Gaignard <benjamin.gaignard@collabora.com>
> ---
>  drivers/media/platform/renesas/rcar_drif.c | 5 +++--
>  1 file changed, 3 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/media/platform/renesas/rcar_drif.c b/drivers/media/platform/renesas/rcar_drif.c
> index 163a4ba61c17..020845689ed3 100644
> --- a/drivers/media/platform/renesas/rcar_drif.c
> +++ b/drivers/media/platform/renesas/rcar_drif.c
> @@ -424,10 +424,11 @@ static int rcar_drif_queue_setup(struct vb2_queue *vq,
>  			unsigned int sizes[], struct device *alloc_devs[])
>  {
>  	struct rcar_drif_sdr *sdr = vb2_get_drv_priv(vq);
> +	unsigned int q_num_buffers = vb2_get_num_buffers(vq);
>  
>  	/* Need at least 16 buffers */
> -	if (vq->num_buffers + *num_buffers < 16)
> -		*num_buffers = 16 - vq->num_buffers;
> +	if (q_num_buffers + *num_buffers < 16)
> +		*num_buffers = 16 - q_num_buffers;

This should be dropped, and instead min_buffers_needed should be set to 16.

Regards,

	Hans

>  
>  	*num_planes = 1;
>  	sizes[0] = PAGE_ALIGN(sdr->fmt->buffersize);