From mboxrd@z Thu Jan 1 00:00:00 1970 From: Mark Lord Subject: Re: [PATCH] libata: add support for READ/WRITE LONG Date: Fri, 16 Mar 2007 11:32:11 -0400 Message-ID: <45FAB87B.3050305@rtr.ca> References: <3aac340703102322p362998b9labedc13503702d2b@mail.gmail.com> <45F56800.3040104@rtr.ca> <3aac340703121003l43685599t8dbffe6247879a91@mail.gmail.com> <45F5A523.1080500@rtr.ca> <45FA8D7A.3040504@rtr.ca> <45FAA35C.2090902@ru.mvista.com> <45FAA822.7050208@rtr.ca> <45FAAACE.6000503@ru.mvista.com> <45FAACD4.6000709@rtr.ca> <45FAAD11.9010905@rtr.ca> <45FAB662.2040901@ru.mvista.com> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Return-path: Received: from ottawa-hs-64-26-128-89.s-ip.magma.ca ([64.26.128.89]:1072 "EHLO mail.rtr.ca" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753536AbXCPPcN (ORCPT ); Fri, 16 Mar 2007 11:32:13 -0400 In-Reply-To: <45FAB662.2040901@ru.mvista.com> Sender: linux-ide-owner@vger.kernel.org List-Id: linux-ide@vger.kernel.org To: Sergei Shtylyov Cc: Jeff Garzik , Vitaliyi , Tejun Heo , IDE/ATA development list > I think it only requires the *host* to drop to PIO0 timings. > In which case it should be achievable w/o libata modification -- > if the driver has to "snoop" command and turn off prefetch, > why not switch to PIO0 temporarily? Because (1) it is not actually necessary in practice, and (2) see point (1), and (3) that would only be half of the story, in that it would need to be turned back on again afterwards, and (4) not all drivers support PIO mode changes. Cheers