linux-kernel - Re: pata_amd dropping to PIO on resume

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Date:	Fri, 16 Feb 2007 17:18:38 -0600
From:	Robert Hancock <hancockr@...w.ca>
To:	Tobias Diedrich <ranma+kernel@...edrich.de>,
	Linux Kernel ML <linux-kernel@...r.kernel.org>,
	linux-ide@...r.kernel.org, Alan <alan@...rguk.ukuu.org.uk>
Subject: Re: pata_amd dropping to PIO on resume

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@...pamshaw.ca
Home Page: http://www.roberthancock.com/

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