linux-kernel - Re: [PATCH V3] VIA IRQ quirk behaviour change

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Date:	Wed, 13 Sep 2006 01:48:21 +0100
From:	Sergio Monteiro Basto <sergio@...giomb.no-ip.org>
To:	Stian Jordet <liste@...det.net>
Cc:	Alan Cox <alan@...rguk.ukuu.org.uk>, Daniel Drake <dsd@...too.org>,
	akpm@...l.org, torvalds@...l.org, jeff@...zik.org, greg@...ah.com,
	cw@...f.org, bjorn.helgaas@...com, linux-kernel@...r.kernel.org,
	harmon@....edu, len.brown@...el.com, vsu@...linux.ru
Subject: Re: [PATCH V3] VIA IRQ quirk behaviour change

On Tue, 2006-09-12 at 23:38 +0200, Stian Jordet wrote:
> On tir, 2006-09-12 at 13:37 +0100, Sergio Monteiro Basto wrote:
> > Ok, as a quick answer, you have a very primitive VIA SMP board, which
> > make me remember my old laptop. 
> > I maintain what a had write in previous emails about this system. 
> > Seeing the configuration of irqs on windows, USB are in 9, so could be a
> > clue.
> > If I had your board, I'll try not quirk USB (cause quirk put USB in 11)
> > and make USB interrupts work as IO-APIC-edge.
> > 9:       nnnn       nnnn   IO-APIC-edge  uhci_hcd:usb1, uhci_hcd:usb2,
> > uhci_hcd:usb3
> 
> The point is, that even when I do not quirk (just insert return at the
> top of the quirk-function), usb still uses irq 11 (as I wrote here:
> http://lkml.org/lkml/2006/9/6/49 ), but won't work. And acpi (on
> interrupt 9) gets an interrupt storm, and gets disabled.
> 

Good point , you got on your dmesg of kernel 2.6.18-rc6
(http://lkml.org/lkml/2006/9/10/120)

USB Universal Host Controller Interface driver v3.0
ACPI: PCI Interrupt Link [LNKD] enabled at IRQ 11
ACPI: PCI Interrupt 0000:00:11.2[D] -> Link [LNKD] -> GSI 11 (level, low) -> IRQ 11
PCI: VIA IRQ fixup for 0000:00:11.2, from 9 to 11
uhci_hcd 0000:00:11.2: UHCI Host Controller
uhci_hcd 0000:00:11.2: new USB bus registered, assigned bus number 1
uhci_hcd 0000:00:11.2: irq 11, io base 0x00009800
usb usb1: configuration #1 chosen from 1 choice
hub 1-0:1.0: USB hub found
hub 1-0:1.0: 2 ports detected

but before 

ACPI: PCI Interrupt Link [LNKA] (IRQs 3 4 5 6 7 9 10 *11 12 14 15)
ACPI: PCI Interrupt Link [LNKB] (IRQs 3 4 5 6 7 9 *10 11 12 14 15)
ACPI: PCI Interrupt Link [LNKC] (IRQs 3 4 *5 6 7 9 10 11 12 14 15)
ACPI: PCI Interrupt Link [LNKD] (IRQs 3 4 5 6 7 *9 10 11 12 14 15)

LNKD was on 9, so may be the bug is on ACPI: PCI Interrupt Link [LNKD] enabled at IRQ 11
you have to investigate :) 

Further more, your interrupts have 4 steps  
ACPI: PCI Interrupt 0000:00:11.2[D] -> Link [LNKD] -> GSI 11 (level, low) -> IRQ 11
and mine just got 3 
ACPI: PCI Interrupt 0000:00:10.1[A] -> GSI 21 (level, low) -> IRQ 201

> But if I somehow got usb using irq 9, all my problems might vanish...
> 
> -Stian
> 
-- 
Sérgio M. B.

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