Re: pata_amd dropping to PIO on resume

[Robert Hancock]

Tobias Diedrich wrote:
> Possibly a known issue:
>
> After resume pata_amd drops from UDMA/33 to PIO on my system.
> Reloading the module puts both attached optical drives (master and
> slave) back to UDMA/33.
>
> AFAICS "simplex DMA is claimed by other device, disabling DMA" seems
> to be causing it to drop to PIO (but only after a suspend/resume
> cycle, not on boot or module load).
>
> Burning a DVD with 6x speed using PIO makes heavy use of burnproof
> and makes the whole system quite sluggish. :)

Yes, the fact that it's going into simplex mode is the problem, it 
wasn't in simplex to start with. It looks like pata_amd does an 
ata_pci_clear_simplex only for certain chip models, maybe this model 
needs it as well?

--
Robert Hancock      Saskatoon, SK, Canada
To email, remove "nospam" from hancockr@xxxxxxxxxxxxx
Home Page: http://www.roberthancock.com/

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