linux-kernel - Re: PCIe Hotplug: NFG unless I boot with card already inserted.

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Message-Id: <20071016130757.ed2f2ce4.kristen.c.accardi@intel.com>
Date:	Tue, 16 Oct 2007 13:07:57 -0700
From:	Kristen Carlson Accardi <kristen.c.accardi@...el.com>
To:	Mark Lord <lkml@....ca>
Cc:	pcihpd-discuss@...ts.sourceforge.net,
	Linux Kernel <linux-kernel@...r.kernel.org>
Subject: Re: PCIe Hotplug:  NFG unless I boot with card already inserted.

On Tue, 16 Oct 2007 15:31:29 -0400
Mark Lord <lkml@....ca> wrote:

> Mark Lord wrote:
> > Mark Lord wrote:
> >> Kristen Carlson Accardi wrote:
> >>> On Tue, 16 Oct 2007 14:39:33 -0400
> >>> Mark Lord <lkml@....ca> wrote:
> >>>
> >>>> I also checked my modprobe.d/ options, and I am using pciehp_force=1.
> >>>> Without that flag, none of this ever works.
> >>>
> >>> OK - I suspected something like this.  Most Dell computers don't support
> >>> ExpressCard hotplug using Native PCIe -- in fact, I've not seen a single
> >>> one, they explicitly disable it because they have not validated it or
> >>> they have and something didn't work right.  I'll take a look at what 
> >>> you've
> >>> got, but be aware that you are forcing pciehp to load and operate on 
> >>> a system
> >>> where they've certainly either not tested it, or tested it and something
> >>> bad happened.
> >>
> >> Perhaps.  But this one works perfectly, except for two driver bugs:
> >>
> >> 1. Driver does not notice already-inserted cards after modprobe.
> >> 2. Driver fails to function after suspend/resume until reloaded.
> >>
> >> Both of those are fixable in the kernel.
> > 
> > Ahh.. point 2 in particular suffers from "suspend/resume" not implemented.
> > Or rather, implemented as a pair of "do nothing" functions.
> 

I tried to reproduce this on a Lenovo T61, which does have proper firmware
support for _OSC, and also has been validated, and the driver which is 
in 2.6.23-git8 seems to work fine, even across suspend resume.  I suspect
that your system just doesn't support pcie hotplug properly.

You might try getting a BIOS update from Dell.
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