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

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Date:	Sat, 21 Apr 2012 11:46:07 -0700
From:	Yinghai Lu <yinghai@...nel.org>
To:	Martin Mokrejs <mmokrejs@...d.natur.cuni.cz>
Cc:	Sarah Sharp <sarah.a.sharp@...ux.intel.com>,
	linux-pci@...r.kernel.org,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: 3.2.11: PCI Express card cannot be re-detected withing cca 60sec timeframe

On Sat, Apr 21, 2012 at 6:25 AM, Sarah Sharp
<sarah.a.sharp@...ux.intel.com> wrote:
> On Fri, Apr 20, 2012 at 05:09:48PM -0700, Yinghai Lu wrote:
>> On Fri, Apr 20, 2012 at 4:17 PM, Sarah Sharp
>> <sarah.a.sharp@...ux.intel.com> wrote:
>> > On Fri, Apr 20, 2012 at 11:47:14AM -0700, Yinghai Lu wrote:
>> >> On Fri, Apr 20, 2012 at 10:28 AM, Martin Mokrejs
>> >> <mmokrejs@...d.natur.cuni.cz> wrote:
>> >> > [30720.175637] pciehp 0000:00:1c.7:pcie04: pcie_isr: intr_loc 108
>> >> > [30720.175639] pciehp 0000:00:1c.7:pcie04: LinkState change
>> >> > [30720.175643] pciehp 0000:00:1c.7:pcie04: lnk_status = 5011
>> >> > [30720.175644] pciehp 0000:00:1c.7:pcie04: Presence/Notify input change
>> >> > [30720.175648] pciehp 0000:00:1c.7:pcie04: Card not present on Slot(7)
>> >> > [30720.175687] pciehp 0000:00:1c.7:pcie04: Surprise Removal
>> >> > [30720.175718] pciehp 0000:00:1c.7:pcie04: Disabling domain:bus:device=0000:11:00
>> >> > [30720.175721] pciehp 0000:00:1c.7:pcie04: pciehp_unconfigure_device: domain:bus:dev = 0000:11:00
>> >> >
>> >>
>> >> So the USB host control driver xhci put that 11:00.0 in strange power state.
>> >
>> > What do you mean "strange power state"?  The only PCI power states the
>> > xHCI driver will use is D0 or D3hot.  D3hot is entered automatically by
>> > the USB core runtime PM system when all USB devices are disconnected or
>> > suspended.  So what strange power state are we talking about?
>>
>> that's helpful. Can that feature to be disabled?
>
> Yes.  There are several ways to disable automatic entry into D3hot.
> The easiest way is to turn off CONFIG_USB_SUSPEND, which will disable
> USB autosuspend (and subsequent runtime PM entry into D3hot) for all USB
> hosts and devices.

Please try to boot with
usbcore.autosuspend=0

Yinghai
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