Re: [PATCH] ALSA: hda-intel - Disable MSI support by default

[Krzysztof Halasa]

Jeff Garzik <jeff@xxxxxxxxxx> 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.

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
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/