linux-kernel - Re: [PATCH 2/2] xhci: EHCI/XHCI ports switching on Intense-PC.

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Date:	Tue, 24 Jul 2012 11:50:42 +0300
From:	Denis Turischev <denis@...pulab.co.il>
To:	Sarah Sharp <sarah.a.sharp@...ux.intel.com>
CC:	linux-kernel@...r.kernel.org, linux-usb@...r.kernel.org,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Subject: Re: [PATCH 2/2] xhci: EHCI/XHCI ports switching on Intense-PC.

On 07/23/2012 08:44 PM, Sarah Sharp wrote:
> Did you try disabling the wake on bits in the port status registers?  I
> would prefer that solution if it works.
No, I didn't. Why we need to disable wake on capabilities?
> 
> Otherwise this patchset looks fine.  I'll work with the hardware folks
> and see if this is exposed on other boards.  Also, this is not a BIOS
> bug, but a hardware issue that can be worked around in BIOS.  So I might
> edit your description on the first patch a bit when I submit it to Greg.
Of course, please edit it if required.
> 
> Sarah Sharp
> 
> On Mon, Jul 23, 2012 at 02:46:32PM +0300, Denis Turischev wrote:
>> Intense-PC is Compulab's mini-desktop with Intel Panther Point
>> chipset.
>>
>> Unconditional switchover to xHCI provided by function
>> usb_enable_xhci_ports() leads to surprising results, after shutdown
>> system powered-on again after a few seconds. On Windows power
>> related problems were not observed. Switching back to EHCI solves
>> the problem.
>>
>> The patch switches usb ports back to EHCI during xhci shutdown
>> for Intense-PC.
>>
>> Signed-off-by: Denis Turischev <denis@...pulab.co.il>
>> ---
>>  drivers/usb/host/xhci.c |   14 ++++++++++++++
>>  1 file changed, 14 insertions(+)
>>
>> diff --git a/drivers/usb/host/xhci.c b/drivers/usb/host/xhci.c
>> index a979cd0..541efaa 100644
>> --- a/drivers/usb/host/xhci.c
>> +++ b/drivers/usb/host/xhci.c
>> @@ -26,6 +26,8 @@
>>  #include <linux/module.h>
>>  #include <linux/moduleparam.h>
>>  #include <linux/slab.h>
>> +#include <linux/dmi.h>
>> +#include "pci-quirks.h"
>>
>>  #include "xhci.h"
>>
>> @@ -656,8 +658,20 @@ void xhci_stop(struct usb_hcd *hcd)
>>   */
>>  void xhci_shutdown(struct usb_hcd *hcd)
>>  {
>> +	struct pci_dev *pdev;
>> +	const char *brd_name;
>>  	struct xhci_hcd *xhci = hcd_to_xhci(hcd);
>>
>> +	pdev = to_pci_dev(hcd->self.controller);
>> +
>> +	if (usb_is_intel_switchable_xhci(pdev)) {
>> +		brd_name = dmi_get_system_info(DMI_BOARD_NAME);
>> +
>> +		/* quirk for Compulab's Intense-PC board */
>> +		if (brd_name && strstr(brd_name, "Intense-PC"))
>> +			usb_disable_xhci_ports(pdev);
>> +	}
>> +
>>  	spin_lock_irq(&xhci->lock);
>>  	xhci_halt(xhci);
>>  	spin_unlock_irq(&xhci->lock);
>> -- 
>> 1.7.9.5
>>

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