From mboxrd@z Thu Jan 1 00:00:00 1970 From: Robert Hancock Subject: Re: pata_amd dropping to PIO on resume Date: Fri, 16 Feb 2007 17:18:38 -0600 Message-ID: <45D63BCE.2080700@shaw.ca> References: Mime-Version: 1.0 Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit Return-path: Received: from shawidc-mo1.cg.shawcable.net ([24.71.223.10]:37192 "EHLO pd2mo3so.prod.shaw.ca" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751639AbXBPXUc (ORCPT ); Fri, 16 Feb 2007 18:20:32 -0500 In-reply-to: Sender: linux-ide-owner@vger.kernel.org List-Id: linux-ide@vger.kernel.org To: Tobias Diedrich , Linux Kernel ML , linux-ide@vger.kernel.org, Alan 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@nospamshaw.ca Home Page: http://www.roberthancock.com/