linux-kernel - Re: Commit 529febe breaks usb on Freescale P1022

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Message-ID: <20120224210706.GA13759@kroah.com>
Date:	Fri, 24 Feb 2012 13:07:06 -0800
From:	"gregkh@...uxfoundation.org" <gregkh@...uxfoundation.org>
To:	Felipe Balbi <balbi@...com>
Cc:	Liu Shengzhou-B36685 <B36685@...escale.com>,
	"Eibach, Dirk" <Eibach@...ys.de>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-usb@...r.kernel.org" <linux-usb@...r.kernel.org>,
	"stern@...land.harvard.edu" <stern@...land.harvard.edu>
Subject: Re: Commit 529febe breaks usb on Freescale P1022

On Fri, Feb 24, 2012 at 04:45:50PM +0200, Felipe Balbi wrote:
> On Fri, Feb 24, 2012 at 10:27:36AM +0000, Liu Shengzhou-B36685 wrote:
> > 
> > > -----Original Message-----
> > > From: Felipe Balbi [mailto:balbi@...com]
> > > Sent: Friday, February 24, 2012 6:15 PM
> > > To: Eibach, Dirk
> > > Cc: balbi@...com; Liu Shengzhou-B36685; linux-kernel@...r.kernel.org;
> > > gregkh@...uxfoundation.org; linux-usb@...r.kernel.org;
> > > stern@...land.harvard.edu
> > > Subject: Re: Commit 529febe breaks usb on Freescale P1022
> > > 
> > > Hi,
> > > 
> > > On Fri, Feb 24, 2012 at 11:11:46AM +0100, Eibach, Dirk wrote:
> > > >
> > > >
> > > > > > This commit introduces a check for the USB PHY clock.
> > > > > > Problem is that CTRL_PHY_CLK_VALID bit seems not to be
> > > > > present on all
> > > > > > Freescale ehci implementations, at least P1022 does not have it.
> > > > > > So this check always fails and the driver never gets loaded.
> > > > >
> > > > > hmm, you would need a revision check on that function then.
> > > >
> > > > Since I have no idea which Freescale platforms provide this bit and
> > > > which platforms don't, I suggest withdrawing this commit and do some
> > > > investigation on Freescales side to do this properly.
> > > 
> > > Could be, but I would like to hear from Shengzhou first. Not sure what
> > > Greg thinks though :-)
> > > 
> > > --
> > > balbi
> > 
> > Hello,  
> > 
> > Just now I checked it on P1022, P1022 does not have this bit.
> > So far what I know as below: 
> >        - P1023/P3041/P5020 have this bit, and mentions it in RM.
> >        - P3060/4080/PSC913x do have this bit, but not mentioned in RM.
> >        - P1022 have no this bit, not mention it in RM.
> > 
> > I'm confirming this on more chips and will work out a new patch to fix it.
> 
> Ok, Greg will have the final word whether the original commit should be
> reverted or we wait for a fix from you.

If I can get a fix that works soon, I'll take it, and not revert the
original...
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