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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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