linux-kernel - Re: [PATCHv2] phy: omap-usb2: Enable runtime PM of omap-usb2 phy properly

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Date:	Thu, 30 Oct 2014 10:46:22 +0530
From:	Kishon Vijay Abraham I <kishon@...com>
To:	Rabin Vincent <rabin@....in>, <tony@...mide.com>
CC:	<rogerq@...com>, <linux-usb@...r.kernel.org>,
	<linux-kernel@...r.kernel.org>, <ghorbel@...asoftware.com>,
	<linux-omap@...r.kernel.org>
Subject: Re: [PATCHv2] phy: omap-usb2: Enable runtime PM of omap-usb2 phy
 properly



On Thursday 30 October 2014 04:39 AM, Rabin Vincent wrote:
> Unless I'm missing something, this patch appears to have still not been
> picked up.  It would be nice if it can go in for 3.18 so that we have
> working USB on pandaboard again at least in that release.
> 
> Tony, would you mind carrying it as OMAP maintainer since we haven't
> heard anything from Kishon (the PHY maintainer) about this?  It's been
> acked by Roger (whose patch introduced the problem).

I'll send this in this -rc cycle.

Thanks
Kishon

> 
> Thanks.
> 
> (leaving the patch intact below)
> 
> On Tue, Oct 07, 2014 at 12:02:51PM +0100, Oussama Ghorbel wrote:
>> The USB OTG port does not work since v3.16 on omap platform.
>> This is a regression introduced by the commit
>> eb82a3d846fa (phy: omap-usb2: Balance pm_runtime_enable() on probe failure
>>  and remove).
>> This because the call to pm_runtime_enable() function is moved after the
>> call to devm_phy_create() function, which has side effect since later in
>> the subsequent calls of devm_phy_create() there is a check with
>> pm_runtime_enabled() to configure few things.
>>
>> Signed-off-by: Oussama Ghorbel <ghorbel@...asoftware.com>
>> ---
>>  drivers/phy/phy-omap-usb2.c | 6 ++++--
>>  1 file changed, 4 insertions(+), 2 deletions(-)
>>
>> diff --git a/drivers/phy/phy-omap-usb2.c b/drivers/phy/phy-omap-usb2.c
>> index 93d7835..acc13f8 100644
>> --- a/drivers/phy/phy-omap-usb2.c
>> +++ b/drivers/phy/phy-omap-usb2.c
>> @@ -262,14 +262,16 @@ static int omap_usb2_probe(struct platform_device *pdev)
>>  	otg->phy		= &phy->phy;
>>  
>>  	platform_set_drvdata(pdev, phy);
>> +	pm_runtime_enable(phy->dev);
>>  
>>  	generic_phy = devm_phy_create(phy->dev, NULL, &ops, NULL);
>> -	if (IS_ERR(generic_phy))
>> +	if (IS_ERR(generic_phy)) {
>> +		pm_runtime_disable(phy->dev);
>>  		return PTR_ERR(generic_phy);
>> +	}
>>  
>>  	phy_set_drvdata(generic_phy, phy);
>>  
>> -	pm_runtime_enable(phy->dev);
>>  	phy_provider = devm_of_phy_provider_register(phy->dev,
>>  			of_phy_simple_xlate);
>>  	if (IS_ERR(phy_provider)) {
>> -- 
>> 1.8.3.2
>>
>> --
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