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

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Date:	Sun, 19 May 2013 17:22:30 +0200
From:	Michael Braun <michael.braun@....tu-ilmenau.de>
To:	Shengzhou Liu <Shengzhou.Liu@...escale.com>
Cc:	projekt-wlan@....tu-ilmenau.de,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	linux-usb@...r.kernel.org, Alan Stern <stern@...land.harvard.edu>,
	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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