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

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Message-ID: <3F453DDFF675A64A89321A1F3528102170B1BA@039-SN1MPN1-004.039d.mgd.msft.net>
Date:	Fri, 24 Feb 2012 10:27:36 +0000
From:	Liu Shengzhou-B36685 <B36685@...escale.com>
To:	"balbi@...com" <balbi@...com>, "Eibach, Dirk" <Eibach@...ys.de>
CC:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"gregkh@...uxfoundation.org" <gregkh@...uxfoundation.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


> -----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.

Regards,
Shengzhou

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