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SubjectRe: [PATCH] ALSA: hda-intel - Disable MSI support by default
Jeff Garzik <> writes:

>>> We are referring to the standard PCI 2.2 bit, PCI_COMMAND_INTX_DISABLE.
>> Yeah, I figured it, I somewhat forgot about it ... it got introduced
>> in
>> 2.3 though, no ?
> It's pretty new. 2.2 or 2.3.


PCI 2.2 defines bits 0-9 only (bit 7 = Stepping Control)
PCI 2.3 and 3.0: bit 7 = Reserved, bit 10 = Interrupt Disable.

OTOH many devices have "interrupt disable" bit somewhere else, in
their specific PCI config registers or in regular config registers
(accessible with normal Memory Read/Write cycles).

MSI was first defined in PCI 2.2.

Perhaps I can check NV (MCP55) for that problem with a module claiming
all free interrupts. Tomorrow maybe.
Krzysztof Halasa
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