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Message-ID: <OF349CACD2.8D7F43AF-ON8025735A.00538F1E-8025735A.0053BA82@elekta.com>
Date: Tue, 18 Sep 2007 16:14:27 +0100
From: Duncan.Perrett@...kta.com
To: "linux-os \(Dick Johnson\)" <linux-os@...logic.com>
Cc: "Linux kernel" <linux-kernel@...r.kernel.org>
Subject: Re: PCI Interrupt
Sorted.
A setting in the BIOS meant it was storing old configuration data.
After disabling this option, it became a level triggered interrupt and
everything now works!
Thanks.
"linux-os \(Dick
Johnson\)"
<linux-os@...logi To
c.com> <Duncan.Perrett@...kta.com>
cc
18/09/2007 15:34 "Linux kernel"
<linux-kernel@...r.kernel.org>
Subject
Please respond to Re: PCI Interrupt
"linux-os \(Dick
Johnson\)"
<linux-os@...logi
c.com>
On Tue, 18 Sep 2007 Duncan.Perrett@...kta.com wrote:
> The driver already does that ...
>
> result =
> request_irq(irq, can_pci_interrupt, SA_INTERRUPT | SA_SHIRQ,
> pDevice->au8IrqName, pDevice);
>
>
> Any other ideas?
>
> Duncan
>
>
> "linux-os \(Dick
> Johnson\)"
> <linux-os@...logi To
> c.com> <Duncan.Perrett@...kta.com>
> cc
> 18/09/2007 14:57 "Linux kernel"
> <linux-kernel@...r.kernel.org>
> Subject
> Please respond to Re: PCI Interrupt
> "linux-os \(Dick
> Johnson\)"
> <linux-os@...logi
> c.com>
>
> On Tue, 18 Sep 2007 Duncan.Perrett@...kta.com wrote:
>
>>
>> I have a CAN PCI card installed on my Ubuntu box.
>> I understand that PCI interrupts should be level rather than edge
>> triggered.
>>
>> The output of cat /proc/interrupts is :-
>>
>> CPU0
>> 0: 1614601 IO-APIC-edge timer
>> 1: 164 IO-APIC-edge i8042
>> 8: 3 IO-APIC-edge rtc
>> 9: 1 IO-APIC-level acpi
>> 12: 0 IO-APIC-edge CAN-ACx-PCI_01
>> 14: 65786 IO-APIC-edge ide0
>> 169: 3220 IO-APIC-level eth0, i915@pci:0000:00:02.0
>> 177: 46459 IO-APIC-level eth1
>> 209: 0 IO-APIC-level uhci_hcd:usb3, eth2
>> 217: 2 IO-APIC-level uhci_hcd:usb1, ehci_hcd:usb4
>> 225: 697 IO-APIC-level uhci_hcd:usb2
>> NMI: 0
>> LOC: 1614399
>> ERR: 0
>> MIS: 0
>>
>> You see that irq 12 CAN-ACx-PCI_01 is edge triggered.
>> Is there any way of forcing the BIOS to see the interrupt as a
>> level-triggered one?
>
> It's done in the driver. IRQ12 can be shared, so the driver
> needs to request the IRQ as a shared interrupt.
>
>
> Cheers,
> Dick Johnson
> Penguin : Linux version 2.6.22.1 on an i686 machine (5588.30 BogoMips).
> My book : http://www.AbominableFirebug.com/
> _
Okay, then in the BIOS, make sure that IRQ12 is not assigned to
a specific device. In other words, set it to PnP (if available).
As you well know, PCI requires sharable interrupts and edges
are not sharable so something is broken. As a last resort,
move your PCI board to abother slot which should pick up another
interrupt, which may not be broken. If that doesn't work, see
if a new BIOS is available for download.
Cheers,
Dick Johnson
Penguin : Linux version 2.6.22.1 on an i686 machine (5588.30 BogoMips).
My book : http://www.AbominableFirebug.com/
_
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