linux-kernel - Re: [PATCH v2 1/2] usb: dwc3: keystone: Add PM_RUNTIME Support to DWC3 Keystone USB driver

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Message-ID: <6c96175e-3624-0921-8e2f-00378a270b59@ti.com>
Date:   Thu, 17 Aug 2017 10:08:22 +0300
From:   Roger Quadros <rogerq@...com>
To:     Franklin S Cooper Jr <fcooper@...com>,
        <gregkh@...uxfoundation.org>, <robh+dt@...nel.org>,
        <ssantosh@...nel.org>, <linux@...linux.org.uk>, <balbi@...nel.org>,
        <linux-usb@...r.kernel.org>, <devicetree@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>, <nsekhar@...com>
Subject: Re: [PATCH v2 1/2] usb: dwc3: keystone: Add PM_RUNTIME Support to
 DWC3 Keystone USB driver


Texas Instruments Finland Oy, Porkkalankatu 22, 00180 Helsinki. Y-tunnus/Business ID: 0615521-4. Kotipaikka/Domicile: Helsinki

On 17/08/17 00:54, Franklin S Cooper Jr wrote:
> For 66AK2Gx there is a requirement to use PM Runtime to properly manage
> clocks and the power domains. Therefore, add PM runtime support. Remove
> legacy clock api's calls since other users of this driver worked without
> these clock apis calls.
> 
> Signed-off-by: Franklin S Cooper Jr <fcooper@...com>

Acked-by: Roger Quadros <rogerq@...com>

> ---
>  drivers/usb/dwc3/dwc3-keystone.c | 22 ++++++++++------------
>  1 file changed, 10 insertions(+), 12 deletions(-)
> 
> diff --git a/drivers/usb/dwc3/dwc3-keystone.c b/drivers/usb/dwc3/dwc3-keystone.c
> index 12ee23f..d2ed952 100644
> --- a/drivers/usb/dwc3/dwc3-keystone.c
> +++ b/drivers/usb/dwc3/dwc3-keystone.c
> @@ -15,7 +15,6 @@
>   * GNU General Public License for more details.
>   */
>  
> -#include <linux/clk.h>
>  #include <linux/module.h>
>  #include <linux/kernel.h>
>  #include <linux/interrupt.h>
> @@ -23,6 +22,7 @@
>  #include <linux/dma-mapping.h>
>  #include <linux/io.h>
>  #include <linux/of_platform.h>
> +#include <linux/pm_runtime.h>
>  
>  /* USBSS register offsets */
>  #define USBSS_REVISION		0x0000
> @@ -41,7 +41,6 @@
>  
>  struct dwc3_keystone {
>  	struct device			*dev;
> -	struct clk			*clk;
>  	void __iomem			*usbss;
>  };
>  
> @@ -106,17 +105,13 @@ static int kdwc3_probe(struct platform_device *pdev)
>  	if (IS_ERR(kdwc->usbss))
>  		return PTR_ERR(kdwc->usbss);
>  
> -	kdwc->clk = devm_clk_get(kdwc->dev, "usb");
> -	if (IS_ERR(kdwc->clk)) {
> -		dev_err(kdwc->dev, "unable to get usb clock\n");
> -		return PTR_ERR(kdwc->clk);
> -	}
> +	pm_runtime_enable(kdwc->dev);
>  
> -	error = clk_prepare_enable(kdwc->clk);
> +	error = pm_runtime_get_sync(kdwc->dev);
>  	if (error < 0) {
> -		dev_err(kdwc->dev, "unable to enable usb clock, error %d\n",
> +		dev_err(kdwc->dev, "pm_runtime_get_sync failed, error %d\n",
>  			error);
> -		return error;
> +		goto err_irq;
>  	}
>  
>  	irq = platform_get_irq(pdev, 0);
> @@ -147,7 +142,8 @@ static int kdwc3_probe(struct platform_device *pdev)
>  err_core:
>  	kdwc3_disable_irqs(kdwc);
>  err_irq:
> -	clk_disable_unprepare(kdwc->clk);
> +	pm_runtime_put_sync(kdwc->dev);
> +	pm_runtime_disable(kdwc->dev);
>  
>  	return error;
>  }
> @@ -167,7 +163,9 @@ static int kdwc3_remove(struct platform_device *pdev)
>  
>  	kdwc3_disable_irqs(kdwc);
>  	device_for_each_child(&pdev->dev, NULL, kdwc3_remove_core);
> -	clk_disable_unprepare(kdwc->clk);
> +	pm_runtime_put_sync(kdwc->dev);
> +	pm_runtime_disable(kdwc->dev);
> +
>  	platform_set_drvdata(pdev, NULL);
>  
>  	return 0;
> 

-- 
cheers,
-roger