From mboxrd@z Thu Jan 1 00:00:00 1970 From: Tejun Heo Subject: Re: [RFC] add DMA setup FIS auto-activate feature Date: Thu, 23 Jul 2009 15:12:38 +0900 Message-ID: <4A67FF56.5040708@kernel.org> References: <1248320734.9035.22.camel@sli10-desk.sh.intel.com> <4A67E00F.40808@pobox.com> <20090723054007.GA7473@sli10-desk.sh.intel.com> <4A67F8ED.2070204@kernel.org> <4A67FE1A.1050408@pobox.com> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Return-path: Received: from hera.kernel.org ([140.211.167.34]:50440 "EHLO hera.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751153AbZGWGMw (ORCPT ); Thu, 23 Jul 2009 02:12:52 -0400 In-Reply-To: <4A67FE1A.1050408@pobox.com> Sender: linux-ide-owner@vger.kernel.org List-Id: linux-ide@vger.kernel.org To: Jeff Garzik Cc: Shaohua Li , linux-ide Jeff Garzik wrote: > Tejun Heo wrote: >> IIRC, AA is in the ahci spec from rev 1.0, so if controllers implement > > AHCI? Perhaps. But AA is not in the _Serial ATA_ 1.0 spec... > > It was added in SATA II, and the SATA II specs specifically mention that > AA was not present in SATA 1.0. Yeap, it wasn't in SATA 1.0 but it was in ahci 1.0 so _theoretically_ all ahcis should be fine with it. We can introduce ATA_FLAG_FPDMA_AA and let the drivers set it. It would probably be better to set it during -rc's and then disable it for release for a few devel cycles. Thanks. -- tejun