Re: PCI lost interrupts and PLX chips

[linux-os]

On Thu, 13 Jan 2005, Dimitris Lampridis wrote:

> Hi everybody,
> I noticed a conversation some days ago that also mentioned something
> about PLX chips and a certain problem resulting in loss of interrupt
> signals.
>
> I'm writing a driver for a PCI-based device (an embedded USB Host
> Controller) and it uses a PLX bridge (device ID 5406). Although I've set
> up the device correctly and a logical analyzer shows the interrupts
> being generated on the USB HC chip, nothing comes past the bridge, thus
> nothing reaches the system. I use a typical pci_enable_device() followed
> but some request_region() and of course request_irq() on a kernel
> 2.6.10-rc3 (i386 system, VIA KT133, no APIC...)
> Does this have something to do with the discussion about PLX chips
> mentioned above? If it does, can anybody make clear what I have to do to
> see those interrupts coming?
>
> You can find the mail in question at:
> http://seclists.org/lists/linux-kernel/2005/Jan/0792.html
>
> Thanks,
> Dimitris

Make sure you execute pci_enable_device() __before__ you believe
the IRQ number in the structure.

Cheers,
Dick Johnson
Penguin : Linux version 2.6.10 on an i686 machine (5537.79 BogoMips).
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