linux-kernel - Re: [PATCH v3 4/4] usb: dwc2: refactor common low-level hw code to platform.c

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Date:	Thu, 1 Oct 2015 22:21:22 +0000
From:	John Youn <John.Youn@...opsys.com>
To:	"balbi@...com" <balbi@...com>, John Youn <John.Youn@...opsys.com>
CC:	Marek Szyprowski <m.szyprowski@...sung.com>,
	"linux-usb@...r.kernel.org" <linux-usb@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-samsung-soc@...r.kernel.org" 
	<linux-samsung-soc@...r.kernel.org>,
	Robert Baldyga <r.baldyga@...sung.com>,
	Krzysztof Kozlowski <k.kozlowski@...sung.com>,
	Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>
Subject: Re: [PATCH v3 4/4] usb: dwc2: refactor common low-level hw code to
 platform.c

On 10/1/2015 3:04 PM, Felipe Balbi wrote:
> On Thu, Oct 01, 2015 at 09:04:59PM +0000, John Youn wrote:
>> On 10/1/2015 8:50 AM, Felipe Balbi wrote:
>>> On Mon, Sep 21, 2015 at 12:16:12PM +0200, Marek Szyprowski wrote:
>>>> DWC2 module on some platforms needs three additional hardware
>>>> resources: phy controller, clock and power supply. All of them must be
>>>> enabled/activated to properly initialize and operate. This was initially
>>>> handled in s3c-hsotg driver, which has been converted to 'gadget' part
>>>> of dwc2 driver. Unfortunately, not all of this code got moved to common
>>>> platform code, what resulted in accessing DWC2 registers without
>>>> enabling low-level hardware resources. This fails for example on Exynos
>>>> SoCs. This patch moves all the code for managing those resources to
>>>> common platform.c file and provides convenient wrappers for controlling
>>>> them.
>>>>
>>>> Signed-off-by: Marek Szyprowski <m.szyprowski@...sung.com>
>>>
>>> I just caught several build errors which this patch. I hope you can
>>> send me a follow-up fix (which I can amend to $subject) otherwise
>>> I'll have to drop this series
>>>
>>
>> I forgot that this was initially part of a larger
>> patch-set. Maybe that is causing issues? If this wasn't intended
>> to go through Felipe's tree then my bad.
>>
>> Also, I noticed this patch causes deadlock warnings with lockdep
>> enabled.
>>
>> Can you look into that also while you investigate this?
> 
> John, do you want me to drop the series meanwhile ? I can do that no problems.
> 

You can drop this one. I think leaving in patch 1-3 is fine as
they are small cleanup patches. Unless you or Marek prefer to
drop all of them.

Regards,
John



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