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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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