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From: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
To: "Niklas Söderlund" <niklas.soderlund+renesas@ragnatech.se>
Cc: Ulrich Hecht <uli@fpond.eu>,
	linux-media@vger.kernel.org, linux-renesas-soc@vger.kernel.org,
	Ulrich Hecht <uli+renesas@fpond.eu>
Subject: Re: [PATCH v2 4/8] rcar-vin: Do not sync subdevice format when opening the video device
Date: Thu, 16 May 2019 14:26:44 +0300
Message-ID: <20190516112644.GB14820@pendragon.ideasonboard.com> (raw)
In-Reply-To: <20190516011417.10590-5-niklas.soderlund+renesas@ragnatech.se>

Hi Niklas,

Thank you for the patch.

On Thu, May 16, 2019 at 03:14:13AM +0200, Niklas Söderlund wrote:
> The format is already synced when the subdevice is bound, there is no
> need to do do it every time the video device is opened.
> 
> Signed-off-by: Niklas Söderlund <niklas.soderlund+renesas@ragnatech.se>
> Reviewed-by: Ulrich Hecht <uli+renesas@fpond.eu>

This seems a bug fix to me, formats should not be modified at open()
time according to the V4L2 spec. You may want to add a Fixes: line,
although I suppose this would go back to the origins of the driver, and
this series is likely not a candidate for the stable tree, so it may not
be a good idea.

I'm slightly worried of side effects as rvin_s_fmt_vid_cap() calls
rvin_try_format() which in turn calls v4l2_subdev_call(sd, pad, set_fmt,
pad_cfg, &format). If you're confident that there's no risk of breakage,

Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>

> ---
>  drivers/media/platform/rcar-vin/rcar-v4l2.c | 25 ---------------------
>  1 file changed, 25 deletions(-)
> 
> diff --git a/drivers/media/platform/rcar-vin/rcar-v4l2.c b/drivers/media/platform/rcar-vin/rcar-v4l2.c
> index f67cef97b89a3bd4..71651c5a69483367 100644
> --- a/drivers/media/platform/rcar-vin/rcar-v4l2.c
> +++ b/drivers/media/platform/rcar-vin/rcar-v4l2.c
> @@ -782,38 +782,13 @@ static int rvin_initialize_device(struct file *file)
>  	struct rvin_dev *vin = video_drvdata(file);
>  	int ret;
>  
> -	struct v4l2_format f = {
> -		.type = V4L2_BUF_TYPE_VIDEO_CAPTURE,
> -		.fmt.pix = {
> -			.width		= vin->format.width,
> -			.height		= vin->format.height,
> -			.field		= vin->format.field,
> -			.colorspace	= vin->format.colorspace,
> -			.pixelformat	= vin->format.pixelformat,
> -		},
> -	};
> -
>  	ret = rvin_power_on(vin);
>  	if (ret < 0)
>  		return ret;
>  
> -	/*
> -	 * Try to configure with default parameters. Notice: this is the
> -	 * very first open, so, we cannot race against other calls,
> -	 * apart from someone else calling open() simultaneously, but
> -	 * .host_lock is protecting us against it.
> -	 */
> -	ret = rvin_s_fmt_vid_cap(file, NULL, &f);
> -	if (ret < 0)
> -		goto esfmt;
> -
>  	v4l2_ctrl_handler_setup(&vin->ctrl_handler);
>  
>  	return 0;
> -esfmt:
> -	rvin_power_off(vin);
> -
> -	return ret;
>  }
>  
>  static int rvin_open(struct file *file)

-- 
Regards,

Laurent Pinchart

  reply index

Thread overview: 21+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-05-16  1:14 [PATCH v2 0/8] rcar-vin: Merge Gen2 and Gen3 file operations Niklas Söderlund
2019-05-16  1:14 ` [PATCH v2 1/8] rcar-vin: Do not call pm_runtime_{resume,suspend}() Niklas Söderlund
2019-05-16  7:23   ` Geert Uytterhoeven
2019-05-16 11:32     ` Laurent Pinchart
2019-05-16  1:14 ` [PATCH v2 2/8] rcar-vin: Remove unneeded calls to pm_runtime_{enable,disable} Niklas Söderlund
2019-05-16  7:27   ` Geert Uytterhoeven
2019-05-16 11:34     ` Laurent Pinchart
2019-05-16  1:14 ` [PATCH v2 3/8] rcar-vin: Allow interrupting lock when trying to open the video device Niklas Söderlund
2019-05-16 11:21   ` Laurent Pinchart
2019-05-16  1:14 ` [PATCH v2 4/8] rcar-vin: Do not sync subdevice format when opening " Niklas Söderlund
2019-05-16 11:26   ` Laurent Pinchart [this message]
2019-05-16 13:25     ` Niklas Söderlund
2019-05-16  1:14 ` [PATCH v2 5/8] rcar-vin: Move pm_runtime_{get,put} out of helpers Niklas Söderlund
2019-05-16 11:39   ` Laurent Pinchart
2019-05-16  1:14 ` [PATCH v2 6/8] rcar-vin: Merge helpers dealing with powering the parallel subdevice Niklas Söderlund
2019-05-16  7:40   ` Ulrich Hecht
2019-05-16 11:44   ` Laurent Pinchart
2019-05-16  1:14 ` [PATCH v2 7/8] rcar-vin: Fold rvin_initialize_device() into rvin_open() Niklas Söderlund
2019-05-16 11:45   ` Laurent Pinchart
2019-05-16  1:14 ` [PATCH v2 8/8] rcar-vin: Merge Gen2 and Gen3 file operations Niklas Söderlund
2019-05-16 11:48   ` Laurent Pinchart

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