linux-kernel - Re: [PATCH v4 13/45] media: sun6i-csi: Introduce and use video helper functions

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Message-ID: <13001485.uLZWGnKmhe@jernej-laptop>
Date:   Wed, 27 Apr 2022 20:50:11 +0200
From:   Jernej Škrabec <jernej.skrabec@...il.com>
To:     linux-kernel@...r.kernel.org, linux-media@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-sunxi@...ts.linux.dev,
        Paul Kocialkowski <paul.kocialkowski@...tlin.com>
Cc:     Yong Deng <yong.deng@...ewell.com>,
        Paul Kocialkowski <paul.kocialkowski@...tlin.com>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Chen-Yu Tsai <wens@...e.org>,
        Samuel Holland <samuel@...lland.org>,
        Laurent Pinchart <laurent.pinchart@...asonboard.com>,
        Maxime Ripard <mripard@...nel.org>,
        Thomas Petazzoni <thomas.petazzoni@...tlin.com>
Subject: Re: [PATCH v4 13/45] media: sun6i-csi: Introduce and use video helper functions

Dne petek, 15. april 2022 ob 17:27:39 CEST je Paul Kocialkowski napisal(a):
> Introduce some helpers for buffer and general video configuration.
> 
> Signed-off-by: Paul Kocialkowski <paul.kocialkowski@...tlin.com>
> ---
>  .../platform/sunxi/sun6i-csi/sun6i_video.c    | 46 +++++++++++--------
>  1 file changed, 28 insertions(+), 18 deletions(-)
> 
> diff --git a/drivers/media/platform/sunxi/sun6i-csi/sun6i_video.c
> b/drivers/media/platform/sunxi/sun6i-csi/sun6i_video.c index
> e6c85fcc65bb..e47eeb27dc4e 100644
> --- a/drivers/media/platform/sunxi/sun6i-csi/sun6i_video.c
> +++ b/drivers/media/platform/sunxi/sun6i-csi/sun6i_video.c
> @@ -92,6 +92,29 @@ static bool sun6i_video_format_check(u32 format)
>  	return false;
>  }
> 
> +/* Video */
> +
> +static void sun6i_video_buffer_configure(struct sun6i_csi_device *csi_dev,
> +					 struct sun6i_csi_buffer 
*csi_buffer)
> +{
> +	csi_buffer->queued_to_csi = true;
> +	sun6i_csi_update_buf_addr(csi_dev, csi_buffer->dma_addr);
> +}
> +
> +static void sun6i_video_configure(struct sun6i_csi_device *csi_dev)
> +{
> +	struct sun6i_video *video = &csi_dev->video;
> +	struct sun6i_csi_config config = { 0 };
> +
> +	config.pixelformat = video->format.fmt.pix.pixelformat;
> +	config.code = video->mbus_code;
> +	config.field = video->format.fmt.pix.field;
> +	config.width = video->format.fmt.pix.width;
> +	config.height = video->format.fmt.pix.height;
> +
> +	sun6i_csi_update_config(csi_dev, &config);
> +}
> +
>  /* Queue */
> 
>  static int sun6i_video_queue_setup(struct vb2_queue *queue,
> @@ -160,7 +183,6 @@ static int sun6i_video_start_streaming(struct vb2_queue
> *queue, struct video_device *video_dev = &video->video_dev;
>  	struct sun6i_csi_buffer *buf;
>  	struct sun6i_csi_buffer *next_buf;
> -	struct sun6i_csi_config config;
>  	struct v4l2_subdev *subdev;
>  	unsigned long flags;
>  	int ret;
> @@ -182,22 +204,13 @@ static int sun6i_video_start_streaming(struct
> vb2_queue *queue, goto error_media_pipeline;
>  	}
> 
> -	config.pixelformat = video->format.fmt.pix.pixelformat;
> -	config.code = video->mbus_code;
> -	config.field = video->format.fmt.pix.field;
> -	config.width = video->format.fmt.pix.width;
> -	config.height = video->format.fmt.pix.height;
> -
> -	ret = sun6i_csi_update_config(csi_dev, &config);
> -	if (ret < 0)
> -		goto error_media_pipeline;
> +	sun6i_video_configure(csi_dev);

What happened to that error handling? New helper function ignores return value 
of sun6i_csi_update_config(). Why?

Best regards,
Jernej

> 
>  	spin_lock_irqsave(&video->dma_queue_lock, flags);
> 
>  	buf = list_first_entry(&video->dma_queue,
>  			       struct sun6i_csi_buffer, list);
> -	buf->queued_to_csi = true;
> -	sun6i_csi_update_buf_addr(csi_dev, buf->dma_addr);
> +	sun6i_video_buffer_configure(csi_dev, buf);
> 
>  	sun6i_csi_set_stream(csi_dev, true);
> 
> @@ -219,8 +232,7 @@ static int sun6i_video_start_streaming(struct vb2_queue
> *queue, * would also drop frame when lacking of queued buffer.
>  	 */
>  	next_buf = list_next_entry(buf, list);
> -	next_buf->queued_to_csi = true;
> -	sun6i_csi_update_buf_addr(csi_dev, next_buf->dma_addr);
> +	sun6i_video_buffer_configure(csi_dev, next_buf);
> 
>  	spin_unlock_irqrestore(&video->dma_queue_lock, flags);
> 
> @@ -294,8 +306,7 @@ void sun6i_video_frame_done(struct sun6i_csi_device
> *csi_dev) * for next ISR call.
>  	 */
>  	if (!next_buf->queued_to_csi) {
> -		next_buf->queued_to_csi = true;
> -		sun6i_csi_update_buf_addr(csi_dev, next_buf->dma_addr);
> +		sun6i_video_buffer_configure(csi_dev, next_buf);
>  		dev_dbg(csi_dev->dev, "Frame dropped!\n");
>  		goto complete;
>  	}
> @@ -309,8 +320,7 @@ void sun6i_video_frame_done(struct sun6i_csi_device
> *csi_dev) /* Prepare buffer for next frame but one.  */
>  	if (!list_is_last(&next_buf->list, &video->dma_queue)) {
>  		next_buf = list_next_entry(next_buf, list);
> -		next_buf->queued_to_csi = true;
> -		sun6i_csi_update_buf_addr(csi_dev, next_buf->dma_addr);
> +		sun6i_video_buffer_configure(csi_dev, next_buf);
>  	} else {
>  		dev_dbg(csi_dev->dev, "Next frame will be dropped!\n");
>  	}