linux-kernel - Re: [PATCH v5] can: Convert to runtime

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Message-ID: <3a3437c5c8ff48d9a45fee7e81fa8dca@BY2FFO11FD058.protection.gbl>
Date:	Mon, 12 Jan 2015 10:45:04 -0800
From:	Sören Brinkmann <soren.brinkmann@...inx.com>
To:	Kedareswara rao Appana <appana.durga.rao@...inx.com>
CC:	<wg@...ndegger.com>, <mkl@...gutronix.de>,
	<michal.simek@...inx.com>, <grant.likely@...aro.org>,
	<robh+dt@...nel.org>, <linux-can@...r.kernel.org>,
	<netdev@...r.kernel.org>, <linux-arm-kernel@...ts.infradead.org>,
	<linux-kernel@...r.kernel.org>, <devicetree@...r.kernel.org>,
	Kedareswara rao Appana <appanad@...inx.com>
Subject: Re: [PATCH v5] can: Convert to runtime_pm

On Mon, 2015-01-12 at 08:34PM +0530, Kedareswara rao Appana wrote:
> Instead of enabling/disabling clocks at several locations in the driver,
> Use the runtime_pm framework. This consolidates the actions for runtime PM
> In the appropriate callbacks and makes the driver more readable and mantainable.
> 
> Signed-off-by: Soren Brinkmann <soren.brinkmann@...inx.com>
> Signed-off-by: Kedareswara rao Appana <appanad@...inx.com>
> ---
> Changes for v5:
>  - Updated with the review comments.
>    Updated the remove fuction to use runtime_pm.
> Chnages for v4:
>  - Updated with the review comments.
> Changes for v3:
>   - Converted the driver to use runtime_pm.
> Changes for v2:
>   - Removed the struct platform_device* from suspend/resume
>     as suggest by Lothar.
> 
>  drivers/net/can/xilinx_can.c |  157 ++++++++++++++++++++++++++++-------------
>  1 files changed, 107 insertions(+), 50 deletions(-)
[..]
> +static int __maybe_unused xcan_runtime_resume(struct device *dev)
>  {
> -	struct platform_device *pdev = dev_get_drvdata(dev);
> -	struct net_device *ndev = platform_get_drvdata(pdev);
> +	struct net_device *ndev = dev_get_drvdata(dev);
>  	struct xcan_priv *priv = netdev_priv(ndev);
>  	int ret;
> +	u32 isr, status;
>  
>  	ret = clk_enable(priv->bus_clk);
>  	if (ret) {
> @@ -1014,15 +1030,28 @@ static int __maybe_unused xcan_resume(struct device *dev)
>  	ret = clk_enable(priv->can_clk);
>  	if (ret) {
>  		dev_err(dev, "Cannot enable clock.\n");
> -		clk_disable_unprepare(priv->bus_clk);
> +		clk_disable(priv->bus_clk);
[...]
> @@ -1173,12 +1219,23 @@ static int xcan_remove(struct platform_device *pdev)
>  {
>  	struct net_device *ndev = platform_get_drvdata(pdev);
>  	struct xcan_priv *priv = netdev_priv(ndev);
> +	int ret;
> +
> +	ret = pm_runtime_get_sync(&pdev->dev);
> +	if (ret < 0) {
> +		netdev_err(ndev, "%s: pm_runtime_get failed(%d)\n",
> +				__func__, ret);
> +		return ret;
> +	}
>  
>  	if (set_reset_mode(ndev) < 0)
>  		netdev_err(ndev, "mode resetting failed!\n");
>  
>  	unregister_candev(ndev);
> +	pm_runtime_disable(&pdev->dev);
>  	netif_napi_del(&priv->napi);
> +	clk_disable_unprepare(priv->bus_clk);
> +	clk_disable_unprepare(priv->can_clk);

Shouldn't pretty much all these occurrences of clk_disable/enable
disappear? This should all be handled by the runtime_pm framework now.

	Sören
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