Shared ACPI/USB IRQ working in 2.6 but not in 2.4

Shared ACPI/USB IRQ working in 2.6 but not in 2.4

[Marcelo Tosatti]

Hi, 

David van Hoose started having problems with USB on 2.4.23-pre5. USB
device and acpi were now using irq 20:

host/usb-ohci.c: USB OHCI at membase 0xe081a000, IRQ 20

/proc/interrupts:

20:          1   IO-APIC-level  acpi, usb-ohci 


Which makes the USB device not work.

With -pre4 the USB device was using interrupt 9, because acpi failed to 
find the correct IRQ:

pci_irq-0302 [18] acpi_pci_irq_derive   : Unable to derive IRQ for  device 00:03.0 
PCI: No IRQ known for interrupt pin A of device 00:03.0 
host/usb-ohci.c: USB OHCI at membase 0xe081a000, IRQ 9 

Now 2.6 assigns interrupt 20 to acpi and usb-ohci just like in
2.4.23-pre5+, but the USB device works!

Anyone has an idea why the interrupt sharing works with 2.6 but not with
2.4?

 

Re: Shared ACPI/USB IRQ working in 2.6 but not in 2.4

[Len Brown]

The details of this issue are here:

http://bugzilla.kernel.org/show_bug.cgi?id=1283

Looks like the IOAPIC is in a different state in 2.4 and 2.6 before ACPI
programs it.  Also 2.6 has sis_apic_bug code that 2.4 does not -- though
I don't know yet if it actually runs on this box.

cheers,
-Len

On Thu, 2003-11-06 at 07:05, Marcelo Tosatti wrote:
> Hi, 
> 
> David van Hoose started having problems with USB on 2.4.23-pre5. USB
> device and acpi were now using irq 20:
> 
> host/usb-ohci.c: USB OHCI at membase 0xe081a000, IRQ 20
> 
> /proc/interrupts:
> 
> 20:          1   IO-APIC-level  acpi, usb-ohci 
> 
> 
> Which makes the USB device not work.
> 
> With -pre4 the USB device was using interrupt 9, because acpi failed to 
> find the correct IRQ:
> 
> pci_irq-0302 [18] acpi_pci_irq_derive   : Unable to derive IRQ for  device 00:03.0 
> PCI: No IRQ known for interrupt pin A of device 00:03.0 
> host/usb-ohci.c: USB OHCI at membase 0xe081a000, IRQ 9 
> 
> Now 2.6 assigns interrupt 20 to acpi and usb-ohci just like in
> 2.4.23-pre5+, but the USB device works!
> 
> Anyone has an idea why the interrupt sharing works with 2.6 but not with
> 2.4?
> 
>  
> 
> 
> -
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