From mboxrd@z Thu Jan  1 00:00:00 1970
Return-Path: <linux-kernel-owner+w=401wt.eu-S1753703AbZEYTEn@vger.kernel.org>
Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand
	id S1753703AbZEYTEn (ORCPT <rfc822;w@1wt.eu>);
	Mon, 25 May 2009 15:04:43 -0400
Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1752346AbZEYTEa
	(ORCPT <rfc822;linux-kernel-outgoing>);
	Mon, 25 May 2009 15:04:30 -0400
Received: from h155.mvista.com ([63.81.120.155]:49498 "EHLO imap.sh.mvista.com"
	rhost-flags-OK-FAIL-OK-FAIL) by vger.kernel.org with ESMTP
	id S1752209AbZEYTEa (ORCPT <rfc822;linux-kernel@vger.kernel.org>);
	Mon, 25 May 2009 15:04:30 -0400
Message-ID: <4A1AEBF7.7040402@ru.mvista.com>
Date: Mon, 25 May 2009 23:05:27 +0400
From: Sergei Shtylyov <sshtylyov@ru.mvista.com>
Organization: MontaVista Software Inc.
User-Agent: Mozilla/5.0 (X11; U; Linux i686; rv:1.7.2) Gecko/20040803
X-Accept-Language: ru, en-us, en-gb
MIME-Version: 1.0
To: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>
Cc: =?UTF-8?B?6IOh5rSq5YW1?= <huhb@lemote.com>, yanh@lemote.com,
       wuzhangjin@gmail.com, linux-mips@linux-mips.org,
       Ralf Baechle <ralf@linux-mips.org>,
       IDE/ATA development list <linux-ide@vger.kernel.org>,
       Linux Kernel <linux-kernel@vger.kernel.org>,
       linux-scsi <linux-scsi@vger.kernel.org>,
       Philippe Vachon <philippe@cowpig.ca>, Zhang Le <r0bertz@gentoo.org>,
       Zhang Fuxin <zhangfx@lemote.com>, Arnaud Patard <apatard@mandriva.com>,
       loongson-dev@googlegroups.com, gnewsense-dev@nongnu.org,
       Nicholas Mc Guire <hofrat@hofr.at>, Liu Junliang <liujl@lemote.com>,
       Erwan Lerale <erwan@thiscow.com>
Subject: Re: [loongson-PATCH-v1 24/27] fixup for FUJITSU disk
References: <cover.1242855716.git.wuzhangjin@gmail.com> <1243230339.9819.18.camel@localhost.localdomain> <4A1A4A54.6090401@lemote.com> <200905251656.25357.bzolnier@gmail.com>
In-Reply-To: <200905251656.25357.bzolnier@gmail.com>
Content-Type: text/plain; charset=UTF-8; format=flowed
Content-Transfer-Encoding: 8bit
Sender: linux-kernel-owner@vger.kernel.org
List-ID: <linux-kernel.vger.kernel.org>
X-Mailing-List: linux-kernel@vger.kernel.org

Bartlomiej Zolnierkiewicz wrote:

>>yanh 写道:

> [...]

>>>the cs5536 pata driver have some geode platform dependent codes. We can
>>>just ignore it, but the performance is poor(using hdparm to test it),
>>>which only get 22+ MB/s. we find it only use udma2. However if using
>>>amd74xx driver, it can set udma5, and the speed can reach to 50+ MB/s. 

>>>we will test whether this driver is working well without this patch.

>>>Anyway, thanks your advice.

>>Use the driver drivers/ata/pata_cs5536.c, unfortunately it also have the 
>>same issue.

> Both drivers (pata_cs5536 & cs5536) should handle UDMA5.

> Could you please explain the issue with platform specific code a bit more?

> Is it related to a cable detection by any chance?

    I guess it's rdmsr()/wrmsr()...

> Thanks.
> Bart

MBR, Sergei