linux-kernel - Re: [PATCH v2] media: imx-jpeg: Set V4L2_BUF_FLAG

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Date:   Thu, 10 Feb 2022 14:01:19 +0200
From:   "mirela.rabulea@....nxp.com" <mirela.rabulea@....nxp.com>
To:     Ming Qian <ming.qian@....com>, mchehab@...nel.org,
        shawnguo@...nel.org, s.hauer@...gutronix.de
Cc:     hverkuil-cisco@...all.nl, kernel@...gutronix.de,
        festevam@...il.com, linux-imx@....com, linux-media@...r.kernel.org,
        linux-kernel@...r.kernel.org, devicetree@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH v2] media: imx-jpeg: Set V4L2_BUF_FLAG_LAST at eos

Hi Ming,
thanks for the description update.

Reviewed-by: Mirela Rabulea <mirela.rabulea@....com>

Regards,
Mirela

On 10.02.2022 07:46, Ming Qian wrote:
> The V4L2_EVENT_EOS event is a deprecated behavior,
> the V4L2_BUF_FLAG_LAST buffer flag should be used instead.
> 
> Signed-off-by: Ming Qian <ming.qian@....com>
> Reviewed-by: Mirela Rabulea <mirela.rabulea@....com>
> ---
>   drivers/media/platform/imx-jpeg/mxc-jpeg.c | 39 ++++++++++++++++++++--
>   drivers/media/platform/imx-jpeg/mxc-jpeg.h |  1 +
>   2 files changed, 38 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/media/platform/imx-jpeg/mxc-jpeg.c b/drivers/media/platform/imx-jpeg/mxc-jpeg.c
> index 86d37d14cfe2..3c50c572d6b0 100644
> --- a/drivers/media/platform/imx-jpeg/mxc-jpeg.c
> +++ b/drivers/media/platform/imx-jpeg/mxc-jpeg.c
> @@ -991,6 +991,20 @@ static void mxc_jpeg_device_run(void *priv)
>   	spin_unlock_irqrestore(&ctx->mxc_jpeg->hw_lock, flags);
>   }
>   
> +static void mxc_jpeg_set_last_buffer_dequeued(struct mxc_jpeg_ctx *ctx)
> +{
> +	struct vb2_queue *q;
> +
> +	ctx->stopped = 1;
> +	q = v4l2_m2m_get_dst_vq(ctx->fh.m2m_ctx);
> +	if (!list_empty(&q->done_list))
> +		return;
> +
> +	q->last_buffer_dequeued = true;
> +	wake_up(&q->done_wq);
> +	ctx->stopped = 0;
> +}
> +
>   static int mxc_jpeg_decoder_cmd(struct file *file, void *priv,
>   				struct v4l2_decoder_cmd *cmd)
>   {
> @@ -1008,6 +1022,7 @@ static int mxc_jpeg_decoder_cmd(struct file *file, void *priv,
>   		if (v4l2_m2m_num_src_bufs_ready(fh->m2m_ctx) == 0) {
>   			/* No more src bufs, notify app EOS */
>   			notify_eos(ctx);
> +			mxc_jpeg_set_last_buffer_dequeued(ctx);
>   		} else {
>   			/* will send EOS later*/
>   			ctx->stopping = 1;
> @@ -1034,6 +1049,7 @@ static int mxc_jpeg_encoder_cmd(struct file *file, void *priv,
>   		if (v4l2_m2m_num_src_bufs_ready(fh->m2m_ctx) == 0) {
>   			/* No more src bufs, notify app EOS */
>   			notify_eos(ctx);
> +			mxc_jpeg_set_last_buffer_dequeued(ctx);
>   		} else {
>   			/* will send EOS later*/
>   			ctx->stopping = 1;
> @@ -1110,6 +1126,8 @@ static void mxc_jpeg_stop_streaming(struct vb2_queue *q)
>   		v4l2_m2m_buf_done(vbuf, VB2_BUF_STATE_ERROR);
>   	}
>   	pm_runtime_put_sync(&ctx->mxc_jpeg->pdev->dev);
> +	ctx->stopping = 0;
> +	ctx->stopped = 0;
>   }
>   
>   static int mxc_jpeg_valid_comp_id(struct device *dev,
> @@ -1401,12 +1419,29 @@ static int mxc_jpeg_buf_prepare(struct vb2_buffer *vb)
>   	return 0;
>   }
>   
> +static void mxc_jpeg_buf_finish(struct vb2_buffer *vb)
> +{
> +	struct vb2_v4l2_buffer *vbuf = to_vb2_v4l2_buffer(vb);
> +	struct mxc_jpeg_ctx *ctx = vb2_get_drv_priv(vb->vb2_queue);
> +	struct vb2_queue *q = vb->vb2_queue;
> +
> +	if (V4L2_TYPE_IS_OUTPUT(vb->type))
> +		return;
> +	if (!ctx->stopped)
> +		return;
> +	if (list_empty(&q->done_list)) {
> +		vbuf->flags |= V4L2_BUF_FLAG_LAST;
> +		ctx->stopped = 0;
> +	}
> +}
> +
>   static const struct vb2_ops mxc_jpeg_qops = {
>   	.queue_setup		= mxc_jpeg_queue_setup,
>   	.wait_prepare		= vb2_ops_wait_prepare,
>   	.wait_finish		= vb2_ops_wait_finish,
>   	.buf_out_validate	= mxc_jpeg_buf_out_validate,
>   	.buf_prepare		= mxc_jpeg_buf_prepare,
> +	.buf_finish             = mxc_jpeg_buf_finish,
>   	.start_streaming	= mxc_jpeg_start_streaming,
>   	.stop_streaming		= mxc_jpeg_stop_streaming,
>   	.buf_queue		= mxc_jpeg_buf_queue,
> @@ -1842,14 +1877,14 @@ static int mxc_jpeg_dqbuf(struct file *file, void *priv,
>   	int ret;
>   
>   	dev_dbg(dev, "DQBUF type=%d, index=%d", buf->type, buf->index);
> -	if (ctx->stopping == 1	&& num_src_ready == 0) {
> +	if (ctx->stopping == 1 && num_src_ready == 0) {
>   		/* No more src bufs, notify app EOS */
>   		notify_eos(ctx);
>   		ctx->stopping = 0;
> +		mxc_jpeg_set_last_buffer_dequeued(ctx);
>   	}
>   
>   	ret = v4l2_m2m_dqbuf(file, fh->m2m_ctx, buf);
> -
>   	return ret;
>   }
>   
> diff --git a/drivers/media/platform/imx-jpeg/mxc-jpeg.h b/drivers/media/platform/imx-jpeg/mxc-jpeg.h
> index 9fb2a5aaa941..f53f004ba851 100644
> --- a/drivers/media/platform/imx-jpeg/mxc-jpeg.h
> +++ b/drivers/media/platform/imx-jpeg/mxc-jpeg.h
> @@ -91,6 +91,7 @@ struct mxc_jpeg_ctx {
>   	struct v4l2_fh			fh;
>   	enum mxc_jpeg_enc_state		enc_state;
>   	unsigned int			stopping;
> +	unsigned int			stopped;
>   	unsigned int			slot;
>   };
>