linux-kernel - RE: Regression in 3735ba8db8e6ea22ad3ff524328926d8d780a884 with Freescale P1020

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Date:	Mon, 20 May 2013 03:37:06 +0000
From:	Liu Shengzhou-B36685 <B36685@...escale.com>
To:	Michael Braun <michael.braun@....tu-ilmenau.de>,
	Mehresh Ramneek-B31383 <B31383@...escale.com>
CC:	"projekt-wlan@....tu-ilmenau.de" <projekt-wlan@....tu-ilmenau.de>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	"linux-usb@...r.kernel.org" <linux-usb@...r.kernel.org>,
	Alan Stern <stern@...land.harvard.edu>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: RE: Regression in 3735ba8db8e6ea22ad3ff524328926d8d780a884 with
 Freescale P1020

Hi Braun,

At that time I had an P4080DS board which had the same issue and had been fixed with this patch.
I didn't test it on P1020 due to the absence of P1020. I think P1020 will need a new patch besides this one.
Later Ramneek took this issue on P1020 for more investigation.

Hello Ramneek, any update for the PHY_CLK_VALID issue?

Regards,
Shengzhou


> -----Original Message-----
> From: Michael Braun [mailto:michael.braun@....tu-ilmenau.de]
> Sent: Sunday, May 19, 2013 11:23 PM
> To: Liu Shengzhou-B36685
> Cc: projekt-wlan@....tu-ilmenau.de; Greg Kroah-Hartman; linux-
> usb@...r.kernel.org; Alan Stern; linux-kernel@...r.kernel.org
> Subject: Re: Regression in 3735ba8db8e6ea22ad3ff524328926d8d780a884 with
> Freescale P1020
> 
> Hi,
> 
> I've got hardware here to test with, so if there any changes to test, I'm
> willing to support.
> Meanwhile, might it be a good idea to make that check optional - i.e. add
> a module parameter or something like this around it?
> 
> Regards,
>  M. Braun
> 
> On Thu, Apr 18, 2013 at 05:13:39PM +0200, michael-dev wrote:
> > Hi,
> >
> > thanks for the quick reply.
> >
> > >Please review the patch http://patchwork.ozlabs.org/patch/237201/
> > I applied it, but it does not make any difference on my platform.
> >
> > Regards,
> >  M. Braun
> >
> > Am 17.04.2013 12:53, schrieb Liu Shengzhou-B36685:
> > >Hi Braun,
> > >
> > >It seems the duplicated tdi_reset caused the PHY_CLK_VALID bit
> > >unstable, introduced by patch "EHCI: centralize controller
> > >initialization".
> > >I submitted a patch to fix it.
> > >Please review the patch http://patchwork.ozlabs.org/patch/237201/
> > >
> > >Regards,
> > >Shengzhou
> > >
> > >
> > >>-----Original Message-----
> > >>From: Michael Braun [mailto:michael-dev@...i-braun.de]
> > >>Sent: Wednesday, April 17, 2013 6:08 PM
> > >>To: Liu Shengzhou-B36685
> > >>Cc: Alan Stern; projekt-wlan@....tu-ilmenau.de; Greg Kroah-Hartman;
> > >>linux-usb@...r.kernel.org; linux-kernel@...r.kernel.org
> > >>Subject: Regression in 3735ba8db8e6ea22ad3ff524328926d8d780a884 with
> > >>Freescale P1020
> > >>
> > >>Hi,
> > >>
> > >>I'm running OpenWRT Kernel 3.8.3 (which already has
> > >>f66dea709cd9309b2ee9f715697818001fb518de and
> > >>5ed338778f917a035f0f0a52327fc4f72e36f7a1 applied) on a P1020WLAN
> > >>(QorlQ,
> > >>PPC) device.
> > >>Before updating the kernel from 3.3.0, USB host support was working
> > >>fine.
> > >>Now I get "fsl-ehci: USB PHY clock invalid" messages in dmesg and
> > >>the lsusb output is empty, so USB host support is not working. When
> > >>I apply the following patch, USB host support starts working again,
> > >>so I guess
> > >>3735ba8db8e6ea22ad3ff524328926d8d780a884 is the cause.
> > >>Do you have an idea how to fix it more appropriately?
> > >>
> > >>Thanks,
> > >>  M. Braun
> > >>
> > >>--- a/drivers/usb/host/ehci-fsl.c       2013-04-15 21:13:52.924403077
> > >>+0200
> > >>+++ b/drivers/usb/host/ehci-fsl.c       2013-04-15 21:13:57.572410838
> > >>+0200
> > >>@@ -273,7 +273,6 @@ static int ehci_fsl_setup_phy(struct usb
> > >>                 if (!spin_event_timeout(in_be32(non_ehci +
> > >>FSL_SOC_USB_CTRL) &
> > >>                                 PHY_CLK_VALID,
> > >>FSL_USB_PHY_CLK_TIMEOUT,
> > >>0)) {
> > >>                         printk(KERN_WARNING "fsl-ehci: USB PHY
> > >>clock invalid\n");
> > >>-                       return -EINVAL;
> > >>                 }
> > >>         }
> > >>


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