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From: Jeff Garzik <>
To: Robert Hancock <>
Cc: Tobias Diedrich <>,
	Linux Kernel ML <>,, Alan <>
Subject: Re: pata_amd dropping to PIO on resume
Date: Fri, 16 Feb 2007 18:51:08 -0500	[thread overview]
Message-ID: <> (raw)
In-Reply-To: <>

Robert Hancock wrote:
> 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?

Deleting the ata_pci_clear_simplex() call, then adding 
ATA_FLAG_IGN_SIMPLEX to the ata_port_info info[] array, is also worth 


  reply	other threads:[~2007-02-16 23:51 UTC|newest]

Thread overview: 7+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
     [not found] <>
2007-02-16 23:18 ` Robert Hancock
2007-02-16 23:51   ` Jeff Garzik [this message]
2007-02-17  9:49     ` Tobias Diedrich
2007-02-19 22:08     ` Alan
2007-02-20 15:27       ` Jeff Garzik
2007-02-20 16:42         ` Alan
2007-02-16 16:21 Tobias Diedrich

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