linux-kernel - Re: [PATCH v2 10/36] media: ti: am437x: Remove useless setting of min_buffers

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Date:   Mon, 4 Dec 2023 15:29:20 +0100
From:   Hans Verkuil <hverkuil@...all.nl>
To:     Benjamin Gaignard <benjamin.gaignard@...labora.com>,
        mchehab@...nel.org, tfiga@...omium.org, m.szyprowski@...sung.com,
        matt.ranostay@...sulko.com
Cc:     linux-kernel@...r.kernel.org, linux-media@...r.kernel.org,
        linux-staging@...ts.linux.dev, kernel@...labora.com,
        "Lad, Prabhakar" <prabhakar.csengg@...il.com>
Subject: Re: [PATCH v2 10/36] media: ti: am437x: Remove useless setting of
 min_buffers_needed

On 04/12/2023 14:22, Benjamin Gaignard wrote:
> This driver uses min_buffers_needed which vb2 uses to ensure
> start_streaming is called when at least 'min_buffers_needed'
> buffers are queued. However, this driver doesn't need this,
> it can stream fine without any buffers queued.
> Just drop this unnecessary restriction.
> 
> Signed-off-by: Benjamin Gaignard <benjamin.gaignard@...labora.com>
> CC: "Lad, Prabhakar" <prabhakar.csengg@...il.com>
> ---
>  drivers/media/platform/ti/am437x/am437x-vpfe.c | 1 -
>  1 file changed, 1 deletion(-)
> 
> diff --git a/drivers/media/platform/ti/am437x/am437x-vpfe.c b/drivers/media/platform/ti/am437x/am437x-vpfe.c
> index f18acf9286a2..228920450e7a 100644
> --- a/drivers/media/platform/ti/am437x/am437x-vpfe.c
> +++ b/drivers/media/platform/ti/am437x/am437x-vpfe.c
> @@ -2234,7 +2234,6 @@ static int vpfe_probe_complete(struct vpfe_device *vpfe)
>  	q->buf_struct_size = sizeof(struct vpfe_cap_buffer);
>  	q->timestamp_flags = V4L2_BUF_FLAG_TIMESTAMP_MONOTONIC;
>  	q->lock = &vpfe->lock;
> -	q->min_buffers_needed = 1;
>  	q->dev = vpfe->pdev;
>  
>  	err = vb2_queue_init(q);

This driver needs one buffer as well, so drop this patch.

Regards,

	Hans