Re: [PATCH alt4 v3] libata resume fixes

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I tried merging Linus's one-liner in front of alt4_v2,
and the screen came back right away (instead of stalling 30seconds),
and then the alt4_v2 code killed the interface as before.  :)

Jeff Garzik wrote:
Here's alt4 v3.  Having the host_stat == 0x1 was suspicious.
After digging through the hardware manual, it might be a good idea to
configure BMDMA registers properly, in case that was done by BIOS but
not by D3->D0 silicon reset values.

I'll try that.  But does it make sense that Linus's one-liner
would also work, if this was really the problem?  (dunno, just asking)

One core problem with all of libata suspend/resume is that
* we boot from a configuration set up by BIOS
* but going D3->D0, we simply get silicon defaults

Randy Dunlap's ACPI patches will probably help a bit.

The ACPI patches have indeed been working here for over a year now,
on all kernels up to 2.6.15 --> not needed for 2.6.16.

Cheers
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