linux-kernel - Re: [PATCH 2/6] usb: dwc3-omap: use runtime API's to enable clocks

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Message-ID: <20120928125840.GL31006@arwen.pp.htv.fi>
Date:	Fri, 28 Sep 2012 15:58:41 +0300
From:	Felipe Balbi <balbi@...com>
To:	Kishon Vijay Abraham I <kishon@...com>
Cc:	grant.likely@...retlab.ca, rob.herring@...xeda.com,
	rob@...dley.net, linux-usb@...r.kernel.org,
	linux-omap@...r.kernel.org, devicetree-discuss@...ts.ozlabs.org,
	linux-doc@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org, gregkh@...uxfoundation.org,
	balbi@...com
Subject: Re: [PATCH 2/6] usb: dwc3-omap: use runtime API's to enable clocks

Hi,

On Fri, Sep 28, 2012 at 06:23:11PM +0530, Kishon Vijay Abraham I wrote:
> Before accessing any register, runtime API's should be invoked to enable
> the clocks. runtime API's are added here to prevent abort during register
> access.
> 
> Signed-off-by: Kishon Vijay Abraham I <kishon@...com>
> ---
>  drivers/usb/dwc3/dwc3-omap.c |   10 ++++++++++
>  1 file changed, 10 insertions(+)
> 
> diff --git a/drivers/usb/dwc3/dwc3-omap.c b/drivers/usb/dwc3/dwc3-omap.c
> index 34578de..6a0e17f 100644
> --- a/drivers/usb/dwc3/dwc3-omap.c
> +++ b/drivers/usb/dwc3/dwc3-omap.c
> @@ -43,6 +43,7 @@
>  #include <linux/spinlock.h>
>  #include <linux/platform_device.h>
>  #include <linux/platform_data/dwc3-omap.h>
> +#include <linux/pm_runtime.h>
>  #include <linux/dma-mapping.h>
>  #include <linux/ioport.h>
>  #include <linux/io.h>
> @@ -281,6 +282,13 @@ static int __devinit dwc3_omap_probe(struct platform_device *pdev)
>  	omap->irq	= irq;
>  	omap->base	= base;
>  
> +	pm_runtime_enable(dev);
> +	ret = pm_runtime_get_sync(dev);
> +	if (ret < 0) {
> +		dev_err(dev, "get_sync failed with err %d\n", ret);
> +			goto err1;
> +	}
> +
>  	reg = dwc3_omap_readl(omap->base, USBOTGSS_UTMI_OTG_STATUS);
>  
>  	utmi_mode = of_get_property(node, "utmi-mode", &size);
> @@ -354,6 +362,8 @@ err1:
>  static int __devexit dwc3_omap_remove(struct platform_device *pdev)
>  {
>  	device_for_each_child(&pdev->dev, NULL, dwc3_remove_core);
> +	pm_runtime_put(&pdev->dev);
> +	pm_runtime_disable(&pdev->dev);

You're going to disable pm_runtime here, so it's better to use
pm_runtime_put_sync(), I guess ??

-- 
balbi

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