Re: 3.2.11: PCI Express card cannot be re-detected withing cca 60sec timeframe

From: Yinghai Lu <yinghai@kernel.org>
To: Martin Mokrejs <mmokrejs@fold.natur.cuni.cz>
Cc: linux-pci@vger.kernel.org,
	Linux Kernel Mailing List <linux-kernel@vger.kernel.org>
Subject: Re: 3.2.11: PCI Express card cannot be re-detected withing cca 60sec timeframe
Date: Thu, 19 Apr 2012 14:48:25 -0700	[thread overview]
Message-ID: <CAE9FiQU7gnKiwazN_2ykbXSkcuDqWMZNt0CHiGvae2L+rTVGug@mail.gmail.com> (raw)
In-Reply-To: <4F909CEB.3060407@fold.natur.cuni.cz>

On Thu, Apr 19, 2012 at 4:16 PM, Martin Mokrejs
<mmokrejs@fold.natur.cuni.cz> wrote:
>
>
> Yinghai Lu wrote:
>> On Wed, Apr 18, 2012 at 1:29 PM, Martin Mokrejs
>> <mmokrejs@fold.natur.cuni.cz> wrote:
>>> Yinghai Lu wrote:
>>>> On Wed, Apr 18, 2012 at 10:53 AM, Martin Mokrejs
>>>> <mmokrejs@fold.natur.cuni.cz> wrote:
>>>>>> After you remove USB3 expresscard, you need to
>>>>>>
>>>>>> echo 1 > /sys/devices/pci0000\:00/0000\:00\:1c.7/pcie_link_disable
>>>>>> then
>>>>>> echo 0 > /sys/devices/pci0000\:00/0000\:00\:1c.7/pcie_link_disable
>>>>>
>>
>> sometimes it report correctly. sometime it does not.
>
> I realized with Win 7 that if the Express Card with the two USB 3.0 ports has an external drive
> connected, its removal gets "always" detected. Probably because USB is polling for the disk and
> realizes that is is gone?
>
> Second observation is that in Device manager if I open the USB controllers list, I see for
> this card a USB HUB and a USB controller (two lines in the listig). If I remove the card
> the listing doesn't get updated. When I open the ROOT HUB properties, on the General tab
> is claimed that it is working well and the system does not realize the card is unplugged
> a long while already. But, if I open properties of the HOST CONTROLLER, it I think updates
> the "General tab" and says something about code 45. And after closing tgis HOST CONTROLLER
> window, the Device manager windows gets refreshed and the two lines related to the card
> disappear.

ok, other OS have same problem.

>
>
>
> I just tried something similar under linux, with all the patches I accumulated for 3.4-rc3
> and posted in my previous emails. It seems linux flips some value so on every second card
> removal it really does realize it was just unplugged.
...

that is really looks like silicon problem.

> Maybe the above is helpful?
> Martin
> P.S.: Meanwhile am waiting for an answer from Dell.

thinkpad 420 only can use acpiphp, because bios does give PCI CAP
control to OS via _OSC, pciehp could not used.

Yinghai