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

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Message-ID: <20151001223127.GE32355@saruman.tx.rr.com>
Date:	Thu, 1 Oct 2015 17:31:27 -0500
From:	Felipe Balbi <balbi@...com>
To:	John Youn <John.Youn@...opsys.com>
CC:	"balbi@...com" <balbi@...com>,
	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 Thu, Oct 01, 2015 at 10:21:22PM +0000, 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.

dropped this one for now. Thanks

-- 
balbi

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