linux-kernel - Re: [PATCH v1] xhci: Switch Intel Lynx Point ports to EHCI on shutdown

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Date:	Tue, 07 Jan 2014 11:03:00 +0100
From:	Takashi Iwai <tiwai@...e.de>
To:	Denis Turischev <denis.turischev@...pulab.co.il>
Cc:	Sarah Sharp <sarah.a.sharp@...ux.intel.com>,
	linux-kernel@...r.kernel.org, linux-usb@...r.kernel.org,
	Oliver Neukum <oneukum@...e.de>, dashing.meng@...il.com,
	Niklas Schnelle <niklas@...ani.de>,
	Giorgos <ganastasiouGR@...il.com>, art1@...x.net
Subject: Re: [PATCH v1] xhci: Switch Intel Lynx Point ports to EHCI on shutdown

At Mon, 06 Jan 2014 14:34:28 +0200,
Denis Turischev wrote:
> 
> Hi Sarah,
> 
> On 01/03/2014 02:03 AM, Sarah Sharp wrote:
> > Denis, do all of Compulab's Haswell systems reboot on shutdown?  Are
> > they all running a Phoenix BIOS?  Can you send me the output of `sudo
> > lspci -vvv -s` for the xHCI host?
> 
> oem@...-Intense-PC2 ~ $ sudo lspci -vvv -s 00:14.0
> 00:14.0 USB controller: Intel Corporation Lynx Point-LP USB xHCI HC (rev 04) (prog-if 30 [XHCI])
> 	Subsystem: Intel Corporation Device 7270
> 	Control: I/O- Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B- DisINTx+
> 	Status: Cap+ 66MHz- UDF- FastB2B+ ParErr- DEVSEL=medium >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx-
> 	Latency: 0
> 	Interrupt: pin A routed to IRQ 59
> 	Region 0: Memory at f0620000 (64-bit, non-prefetchable) [size=64K]
> 	Capabilities: [70] Power Management version 2
> 		Flags: PMEClk- DSI- D1- D2- AuxCurrent=375mA PME(D0-,D1-,D2-,D3hot+,D3cold+)
> 		Status: D0 NoSoftRst+ PME-Enable- DSel=0 DScale=0 PME-
> 	Capabilities: [80] MSI: Enable+ Count=1/8 Maskable- 64bit+
> 		Address: 00000000fee0200c  Data: 41b1
> 	Kernel driver in use: xhci_hcd
> 
> > Basically, I'm trying to find a common variable to key off.  I suspect
> > BIOS vendor is probably the right thing, instead of system vendor.
> 
> By the way the quirk introduced by commit e95829f474f0db3a4d940cae1423783edd966027 "xhci: Switch PPT
> ports to EHCI on shutdown." works for Lynx Point as well at least on Intense-PC2. I mean we can add
> XHCI_SPURIOUS_REBOOT flag that invokes usb_disable_xhci_ports().
> 
> May be this solution works for HP and other systems without side effects?

No, we already tested it at first, but didn't fix the behavior on HP
machines.  It was harmless as far as we've tested, though.


Takashi
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