From mboxrd@z Thu Jan 1 00:00:00 1970 From: Sergei Shtylyov Subject: Re: libata pata_pdc2027x success on sparc64 Date: Wed, 09 Aug 2006 20:05:42 +0400 Message-ID: <44DA07D6.9010101@ru.mvista.com> References: <200607172358.k6HNwYhF002052@harpo.it.uu.se> <44BD2370.8090506@ru.mvista.com> <44C841B5.40806@tw.ibm.com> <17626.1619.653854.241578@alkaid.it.uu.se> 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]:63203 "EHLO imap.sh.mvista.com") by vger.kernel.org with ESMTP id S1751038AbWHIQEg (ORCPT ); Wed, 9 Aug 2006 12:04:36 -0400 In-Reply-To: <17626.1619.653854.241578@alkaid.it.uu.se> Sender: linux-ide-owner@vger.kernel.org List-Id: linux-ide@vger.kernel.org To: Mikael Pettersson Cc: albertl@mail.com, Mikael Pettersson , linux-ide@vger.kernel.org, linux-kernel@vger.kernel.org, alan@redhat.com, Unicorn Chang , Doug Maxey Hello. Mikael Pettersson wrote: > > The libata version has three improvements compared to the IDE version. > > > > 1. The PLL calibration patches in the above URLs (for IDE) > > still need more improvement as done in the pdc_read_counter() > > of the libata version. > > > > 2. The Promise 2027x adapters check the "set features - xfer mode" > > and set the timing register automatically. However, the automatically > > set values are not correct under 133MHz. Libata has a hook > > pdc2027x_post_set_mode() to set the values back by software. > > > > 3. ATAPI DMA is supported (please see pdc2027x_check_atapi_dma()). > > Maybe we also need to add this to the IDE version. > Do you know how large the difference is between the 20267 (old driver) > and the 20269 (new driver) in the areas touched by these patches? Immense. They belong to the different families, register compatibe only in the standard PCI/BM IDE regisrer set -- hence was the driver split. > Long ago I tried a 20267 PCI card in my PowerMac, and it had the same > issues that the 20269 card had. So I'm interested in porting the > calibration/timing fixes to pdc202xx_old.c. They don't apply to this driver at all. The "older" chip family didn't have the PLL to calibrate. It must be some different issue. > /Mikael WBR, Sergei