From mboxrd@z Thu Jan  1 00:00:00 1970
From: jszhang@marvell.com (Jisheng Zhang)
Date: Fri, 4 Dec 2015 22:13:37 +0800
Subject: [PATCH 1/7] usb: xhci: plat: Fix suspend/resume when the
 optional clk exists
In-Reply-To: <1449238252-5630-2-git-send-email-jszhang@marvell.com>
References: <1449238252-5630-1-git-send-email-jszhang@marvell.com>
 <1449238252-5630-2-git-send-email-jszhang@marvell.com>
Message-ID: <20151204221337.46ded0bd@xhacker>
To: linux-arm-kernel@lists.infradead.org
List-Id: linux-arm-kernel.lists.infradead.org

cc linux-usb at vger.kernel.org

On Fri, 4 Dec 2015 22:10:46 +0800
Jisheng Zhang wrote:

> Commit 4718c1774051 ("usb: host: xhci-plat: add clock support") adds
> optional clk support, but it forgets to prepare/disable and
> enable/unprepare the clk in the resume/suspend path. This path fixes
> this issue by adding missing clk related calls.
> 
> Signed-off-by: Jisheng Zhang <jszhang@marvell.com>
> Fixes: 4718c1774051 ("usb: host: xhci-plat: add clock support")
> ---
>  drivers/usb/host/xhci-plat.c | 14 +++++++++++++-
>  1 file changed, 13 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/usb/host/xhci-plat.c b/drivers/usb/host/xhci-plat.c
> index 05647e6..b566304 100644
> --- a/drivers/usb/host/xhci-plat.c
> +++ b/drivers/usb/host/xhci-plat.c
> @@ -226,6 +226,7 @@ static int xhci_plat_remove(struct platform_device *dev)
>  #ifdef CONFIG_PM_SLEEP
>  static int xhci_plat_suspend(struct device *dev)
>  {
> +	int ret;
>  	struct usb_hcd	*hcd = dev_get_drvdata(dev);
>  	struct xhci_hcd	*xhci = hcd_to_xhci(hcd);
>  
> @@ -237,14 +238,25 @@ static int xhci_plat_suspend(struct device *dev)
>  	 * reconsider this when xhci_plat_suspend enlarges its scope, e.g.,
>  	 * also applies to runtime suspend.
>  	 */
> -	return xhci_suspend(xhci, device_may_wakeup(dev));
> +	ret = xhci_suspend(xhci, device_may_wakeup(dev));
> +	if (ret)
> +		return ret;
> +
> +	clk_disable_unprepare(xhci->clk);
> +
> +	return ret;
>  }
>  
>  static int xhci_plat_resume(struct device *dev)
>  {
> +	int ret;
>  	struct usb_hcd	*hcd = dev_get_drvdata(dev);
>  	struct xhci_hcd	*xhci = hcd_to_xhci(hcd);
>  
> +	ret = clk_prepare_enable(xhci->clk);
> +	if (ret)
> +		return ret;
> +
>  	return xhci_resume(xhci, 0);
>  }
>