linux-kernel - Re: [RFC PATCH v6 05/10] media: tegra-video: Separate CSI stream enable and disable implementations

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Date:   Fri, 31 Jul 2020 15:06:41 +0300
From:   Dmitry Osipenko <digetx@...il.com>
To:     Sowjanya Komatineni <skomatineni@...dia.com>,
        thierry.reding@...il.com, jonathanh@...dia.com, frankc@...dia.com,
        hverkuil@...all.nl, sakari.ailus@....fi, robh+dt@...nel.org,
        helen.koike@...labora.com
Cc:     sboyd@...nel.org, gregkh@...uxfoundation.org,
        linux-media@...r.kernel.org, devicetree@...r.kernel.org,
        linux-tegra@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-i2c@...r.kernel.org
Subject: Re: [RFC PATCH v6 05/10] media: tegra-video: Separate CSI stream
 enable and disable implementations

31.07.2020 12:02, Sowjanya Komatineni пишет:
> This patch separates implementation of CSI stream enable and disable
> into separate functions for readability.
> 
> Signed-off-by: Sowjanya Komatineni <skomatineni@...dia.com>
> ---
>  drivers/staging/media/tegra-video/csi.c | 51 ++++++++++++++++++++++-----------
>  1 file changed, 35 insertions(+), 16 deletions(-)
> 
> diff --git a/drivers/staging/media/tegra-video/csi.c b/drivers/staging/media/tegra-video/csi.c
> index fb667df..cfe6187 100644
> --- a/drivers/staging/media/tegra-video/csi.c
> +++ b/drivers/staging/media/tegra-video/csi.c
> @@ -232,34 +232,53 @@ static int tegra_csi_g_frame_interval(struct v4l2_subdev *subdev,
>  	return 0;
>  }
>  
> -static int tegra_csi_s_stream(struct v4l2_subdev *subdev, int enable)
> +static int tegra_csi_enable_stream(struct v4l2_subdev *subdev)
>  {
>  	struct tegra_vi_channel *chan = v4l2_get_subdev_hostdata(subdev);
>  	struct tegra_csi_channel *csi_chan = to_csi_chan(subdev);
>  	struct tegra_csi *csi = csi_chan->csi;
> -	int ret = 0;
> +	int ret;
> +
> +	ret = pm_runtime_get_sync(csi->dev);
> +	if (ret < 0) {
> +		dev_err(csi->dev, "failed to get runtime PM: %d\n", ret);
> +		pm_runtime_put_noidle(csi->dev);
> +		return ret;
> +	}
>  
>  	csi_chan->pg_mode = chan->pg_mode;
> -	if (enable) {
> -		ret = pm_runtime_get_sync(csi->dev);
> -		if (ret < 0) {
> -			dev_err(csi->dev,
> -				"failed to get runtime PM: %d\n", ret);
> -			pm_runtime_put_noidle(csi->dev);
> -			return ret;
> -		}
> +	ret = csi->ops->csi_start_streaming(csi_chan);
> +	if (ret < 0)
> +		goto rpm_put;
>  
> -		ret = csi->ops->csi_start_streaming(csi_chan);
> -		if (ret < 0)
> -			goto rpm_put;
> +	return 0;
>  
> -		return 0;
> -	}
> +rpm_put:
> +	pm_runtime_put(csi->dev);
> +	return ret;
> +}
> +
> +static int tegra_csi_disable_stream(struct v4l2_subdev *subdev)
> +{
> +	struct tegra_csi_channel *csi_chan = to_csi_chan(subdev);
> +	struct tegra_csi *csi = csi_chan->csi;
>  
>  	csi->ops->csi_stop_streaming(csi_chan);
>  
> -rpm_put:
>  	pm_runtime_put(csi->dev);
> +
> +	return 0;
> +}
> +
> +static int tegra_csi_s_stream(struct v4l2_subdev *subdev, int enable)
> +{
> +	int ret;
> +
> +	if (enable)
> +		ret = tegra_csi_enable_stream(subdev);
> +	else
> +		ret = tegra_csi_disable_stream(subdev);
> +
>  	return ret;
>  }
>  
> 

Thanks!

Reviewed-by: Dmitry Osipenko <digetx@...il.com>