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

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Message-id: <560E36AA.7090106@samsung.com>
Date:	Fri, 02 Oct 2015 09:47:54 +0200
From:	Marek Szyprowski <m.szyprowski@...sung.com>
To:	John Youn <John.Youn@...opsys.com>, "balbi@...com" <balbi@...com>
Cc:	"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

Hello,

On 2015-10-02 00:21, John Youn wrote:
> 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.

Patches 1-3 are fixes, so please keep them. I've also just posted an 
updated patch
no 4, I've missed the fact that dwc2_hsotg structure content was defined
conditionally.

Best regards
-- 
Marek Szyprowski, PhD
Samsung R&D Institute Poland

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