linux-kernel - Re: [PATCH v14 50/56] media: verisilicon: vp9: Allow to change resolution while streaming

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Date:   Thu, 9 Nov 2023 15:59:54 +0100
From:   Andrzej Pietrasiewicz <andrzej.p@...labora.com>
To:     Benjamin Gaignard <benjamin.gaignard@...labora.com>,
        mchehab@...nel.org, tfiga@...omium.org, m.szyprowski@...sung.com,
        ming.qian@....com, ezequiel@...guardiasur.com.ar,
        p.zabel@...gutronix.de, gregkh@...uxfoundation.org,
        hverkuil-cisco@...all.nl, nicolas.dufresne@...labora.com
Cc:     linux-media@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        linux-mediatek@...ts.infradead.org, linux-arm-msm@...r.kernel.org,
        linux-rockchip@...ts.infradead.org, linux-staging@...ts.linux.dev,
        kernel@...labora.com
Subject: Re: [PATCH v14 50/56] media: verisilicon: vp9: Allow to change
 resolution while streaming

W dniu 31.10.2023 o 17:30, Benjamin Gaignard pisze:
> Remove all checks that prohibit to set a new format while streaming.
> This allow to change dynamically the resolution if the pixel format
> remains the same.
> 
> Signed-off-by: Benjamin Gaignard <benjamin.gaignard@...labora.com>

Reviewed-by: Andrzej Pietrasiewicz <andrzej.p@...labora.com>

> CC: Ezequiel Garcia <ezequiel@...guardiasur.com.ar>
> CC: Philipp Zabel <p.zabel@...gutronix.de>
> ---
>   .../media/platform/verisilicon/hantro_v4l2.c  | 24 +++----------------
>   1 file changed, 3 insertions(+), 21 deletions(-)
> 
> diff --git a/drivers/media/platform/verisilicon/hantro_v4l2.c b/drivers/media/platform/verisilicon/hantro_v4l2.c
> index f0d8b165abcd..27a1e77cca38 100644
> --- a/drivers/media/platform/verisilicon/hantro_v4l2.c
> +++ b/drivers/media/platform/verisilicon/hantro_v4l2.c
> @@ -514,25 +514,14 @@ static int hantro_set_fmt_out(struct hantro_ctx *ctx,
>   		return ret;
>   
>   	if (!ctx->is_encoder) {
> -		struct vb2_queue *peer_vq;
> -
>   		/*
>   		 * In order to support dynamic resolution change,
>   		 * the decoder admits a resolution change, as long
> -		 * as the pixelformat remains. Can't be done if streaming.
> -		 */
> -		if (vb2_is_streaming(vq) || (vb2_is_busy(vq) &&
> -		    pix_mp->pixelformat != ctx->src_fmt.pixelformat))
> -			return -EBUSY;
> -		/*
> -		 * Since format change on the OUTPUT queue will reset
> -		 * the CAPTURE queue, we can't allow doing so
> -		 * when the CAPTURE queue has buffers allocated.
> +		 * as the pixelformat remains.
>   		 */
> -		peer_vq = v4l2_m2m_get_vq(ctx->fh.m2m_ctx,
> -					  V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE);
> -		if (vb2_is_busy(peer_vq))
> +		if (vb2_is_streaming(vq) && pix_mp->pixelformat != ctx->src_fmt.pixelformat) {
>   			return -EBUSY;
> +		}
>   	} else {
>   		/*
>   		 * The encoder doesn't admit a format change if
> @@ -577,15 +566,8 @@ static int hantro_set_fmt_out(struct hantro_ctx *ctx,
>   static int hantro_set_fmt_cap(struct hantro_ctx *ctx,
>   			      struct v4l2_pix_format_mplane *pix_mp)
>   {
> -	struct vb2_queue *vq;
>   	int ret;
>   
> -	/* Change not allowed if queue is busy. */
> -	vq = v4l2_m2m_get_vq(ctx->fh.m2m_ctx,
> -			     V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE);
> -	if (vb2_is_busy(vq))
> -		return -EBUSY;
> -
>   	if (ctx->is_encoder) {
>   		struct vb2_queue *peer_vq;
>