linux-kernel - RE: [PATCH v4] can: Convert to runtime

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Date:	Tue, 6 Jan 2015 06:23:51 +0000
From:	Appana Durga Kedareswara Rao <appana.durga.rao@...inx.com>
To:	Soren Brinkmann <sorenb@...inx.com>,
	"mkl@...gutronix.de" <mkl@...gutronix.de>
CC:	"wg@...ndegger.com" <wg@...ndegger.com>,
	"mkl@...gutronix.de" <mkl@...gutronix.de>,
	Michal Simek <michals@...inx.com>,
	"grant.likely@...aro.org" <grant.likely@...aro.org>,
	"linux-can@...r.kernel.org" <linux-can@...r.kernel.org>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: RE: [PATCH v4] can: Convert to runtime_pm

Hi Marc,

        Could you please  provide your feedback on this patch ?

@Soren : Will update the driver with your comments during next version of the patch.

Regards,
Kedar.

-----Original Message-----
From: Sören Brinkmann [mailto:soren.brinkmann@...inx.com]
Sent: Wednesday, December 24, 2014 4:13 AM
To: Appana Durga Kedareswara Rao
Cc: wg@...ndegger.com; mkl@...gutronix.de; Michal Simek; grant.likely@...aro.org; linux-can@...r.kernel.org; netdev@...r.kernel.org; linux-kernel@...r.kernel.org; Appana Durga Kedareswara Rao
Subject: Re: [PATCH v4] can: Convert to runtime_pm

On Tue, 2014-12-23 at 05:55PM +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>
> ---
> 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 |  123
> +++++++++++++++++++++++++-----------------
>  1 files changed, 74 insertions(+), 49 deletions(-)
>
> diff --git a/drivers/net/can/xilinx_can.c
> b/drivers/net/can/xilinx_can.c index 6c67643..c71f683 100644
> --- a/drivers/net/can/xilinx_can.c
> +++ b/drivers/net/can/xilinx_can.c
> @@ -32,6 +32,7 @@
>  #include <linux/can/dev.h>
>  #include <linux/can/error.h>
>  #include <linux/can/led.h>
> +#include <linux/pm_runtime.h>
>
>  #define DRIVER_NAME  "xilinx_can"
>
> @@ -138,7 +139,7 @@ struct xcan_priv {
>       u32 (*read_reg)(const struct xcan_priv *priv, enum xcan_reg reg);
>       void (*write_reg)(const struct xcan_priv *priv, enum xcan_reg reg,
>                       u32 val);
> -     struct net_device *dev;
> +     struct device *dev;
>       void __iomem *reg_base;
>       unsigned long irq_flags;
>       struct clk *bus_clk;
> @@ -842,6 +843,13 @@ static int xcan_open(struct net_device *ndev)
>       struct xcan_priv *priv = netdev_priv(ndev);
>       int ret;
>
> +     ret = pm_runtime_get_sync(priv->dev);
> +     if (ret < 0) {
> +             netdev_err(ndev, "%s: pm_runtime_get failed\r(%d)\n\r",

Does this create the intended output? I haven't seen '\r' anywhere else.
Shouldn't this simply be:
        netdev_err(ndev, "%s: pm_runtime_get failed (%d)\n",

[...]
> @@ -934,27 +927,20 @@ static int xcan_get_berr_counter(const struct net_device *ndev,
>       struct xcan_priv *priv = netdev_priv(ndev);
>       int ret;
>
> -     ret = clk_prepare_enable(priv->can_clk);
> -     if (ret)
> -             goto err;
> -
> -     ret = clk_prepare_enable(priv->bus_clk);
> -     if (ret)
> -             goto err_clk;
> +     ret = pm_runtime_get_sync(priv->dev);
> +     if (ret < 0) {
> +             netdev_err(ndev, "%s: pm_runtime_get failed\r(%d)\n\r",

ditto

        Sören


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