linux-kernel - Re: [PACTH v1 1/2] usb: xhci: plat: Enable runtime PM

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Message-ID: <2ed918f2-e3eb-6180-655d-1834903f5de4@collabora.com>
Date:	Fri, 29 Jul 2016 09:31:04 -0400
From:	Robert Foss <robert.foss@...labora.com>
To:	Felipe Balbi <felipe.balbi@...ux.intel.com>,
	mathias.nyman@...el.com, gregkh@...uxfoundation.org,
	linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org
Cc:	Andrew Bresticker <abrestic@...omium.org>
Subject: Re: [PACTH v1 1/2] usb: xhci: plat: Enable runtime PM


On 2016-07-28 08:24 PM, Felipe Balbi wrote:
>
> Hi,
>
> robert.foss@...labora.com writes:
>> From: Andrew Bresticker <abrestic@...omium.org>
>>
>> Enable runtime PM for the xhci-plat device so that the parent device
>> may implement runtime PM.
>>
>> Signed-off-by: Andrew Bresticker <abrestic@...omium.org>
>> Tested-by: Robert Foss <robert.foss@...labora.com>
>> Signed-off-by: Robert Foss <robert.foss@...labora.com>
>> ---
>>  drivers/usb/host/xhci-plat.c | 19 +++++++++++++++++--
>>  1 file changed, 17 insertions(+), 2 deletions(-)
>>
>> diff --git a/drivers/usb/host/xhci-plat.c b/drivers/usb/host/xhci-plat.c
>> index ed56bf9..fbd45c2 100644
>> --- a/drivers/usb/host/xhci-plat.c
>> +++ b/drivers/usb/host/xhci-plat.c
>> @@ -246,6 +246,9 @@ static int xhci_plat_probe(struct platform_device *pdev)
>>  	if (ret)
>>  		goto dealloc_usb2_hcd;
>>
>> +	pm_runtime_set_active(&pdev->dev);
>> +	pm_runtime_enable(&pdev->dev);
>> +
>>  	return 0;
>>
>>
>> @@ -274,6 +277,8 @@ static int xhci_plat_remove(struct platform_device *dev)
>>  	struct xhci_hcd	*xhci = hcd_to_xhci(hcd);
>>  	struct clk *clk = xhci->clk;
>>
>> +	pm_runtime_disable(&dev->dev);
>> +
>>  	usb_remove_hcd(xhci->shared_hcd);
>>  	usb_phy_shutdown(hcd->usb_phy);
>>
>> @@ -292,7 +297,9 @@ static int xhci_plat_suspend(struct device *dev)
>>  {
>>  	struct usb_hcd	*hcd = dev_get_drvdata(dev);
>>  	struct xhci_hcd	*xhci = hcd_to_xhci(hcd);
>> +	int ret;
>>
>> +	pm_runtime_get_sync(dev);
>
> you need to check for possible errors here. Ditto to the other occurence
> below.
>

Thanks for the feedback (on this and the 0/2), I'll fix the issues and 
release a v3.