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    SubjectRe: [PATCH] x86_64: fix problems due to use of "outb" to port 80 on some AMD64x2 laptops, etc.
    From
    On 14-12-07 14:15, Ingo Molnar wrote:

    > wow, cool fix! (I remember that there were other systems as well that
    > are affected by port 0x80 muckery - i thought we had removed port 0x80
    > accesses long ago.)
    >
    > how about the simpler fix below, as a first-level approach? We can then
    > remove the _p in/out sequences after this.

    Your version does the same thing that the version from Pavel/David does for
    32-bit at least.

    > +/*
    > + * Some legacy devices need delays for IN/OUT sequences. Most are
    > + * probably not needed but it's the safest to just do this short delay:
    > + */
    > +void native_io_delay(void)
    > +{
    > + udelay(1);
    > +}

    Also note the thread(s) on LKML where 2 us was decided to be a nicely
    conservative value:

    http://lkml.org/lkml/2007/12/12/309

    Also see: http://lkml.org/lkml/2007/12/14/72

    And also: http://lkml.org/lkml/2007/12/12/221

    As such, please wait a bit for a fuller resolution. We're still discussing this.

    Rene.


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