From: Sergei Shtylyov Subject: Re: [PATCH] libata: add support for READ/WRITE LONG Date: Fri, 16 Mar 2007 18:23:14 +0300 Message-ID: <45FAB662.2040901@ru.mvista.com> 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> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii; format=flowed Content-Transfer-Encoding: 7bit Return-path: Received: from h155.mvista.com ([63.81.120.155]:33627 "EHLO imap.sh.mvista.com" rhost-flags-OK-FAIL-OK-FAIL) by vger.kernel.org with ESMTP id S1753540AbXCPPX0 (ORCPT ); Fri, 16 Mar 2007 11:23:26 -0400 In-Reply-To: <45FAAD11.9010905@rtr.ca> Sender: linux-ide-owner@vger.kernel.org List-Id: linux-ide@vger.kernel.org To: Mark Lord Cc: Jeff Garzik , Vitaliyi , Tejun Heo , IDE/ATA development list Hello. Mark Lord wrote: > But if we really want to be 100% compliant, we could consider dropping > to PIO0 for the command. Not worth it, though, as in practice this is > not necessary, and it would mess up libata far more than is worthwhile > for this effort. 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? > Cheers MBR, Sergei