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

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Message-ID: <2B3535C5ECE8B5419E3ECBE30077290901DC383B31@US01WEMBX2.internal.synopsys.com>
Date:	Thu, 1 Oct 2015 21:04:59 +0000
From:	John Youn <John.Youn@...opsys.com>
To:	"balbi@...com" <balbi@...com>,
	Marek Szyprowski <m.szyprowski@...sung.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>,
	John Youn <John.Youn@...opsys.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 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?

Regards,
John

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