linux-kernel - Re: [loongson-PATCH-v1 24/27] fixup for FUJITSU disk

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Message-Id: <200905251656.25357.bzolnier@gmail.com>
Date:	Mon, 25 May 2009 16:56:24 +0200
From:	Bartlomiej Zolnierkiewicz <bzolnier@...il.com>
To:	胡洪兵 <huhb@...ote.com>
Cc:	yanh@...ote.com, wuzhangjin@...il.com, linux-mips@...ux-mips.org,
	Ralf Baechle <ralf@...ux-mips.org>,
	"IDE/ATA development list" <linux-ide@...r.kernel.org>,
	Linux Kernel <linux-kernel@...r.kernel.org>,
	"linux-scsi" <linux-scsi@...r.kernel.org>,
	Philippe Vachon <philippe@...pig.ca>,
	Zhang Le <r0bertz@...too.org>,
	Zhang Fuxin <zhangfx@...ote.com>,
	Arnaud Patard <apatard@...driva.com>,
	loongson-dev@...glegroups.com, gnewsense-dev@...gnu.org,
	Nicholas Mc Guire <hofrat@...r.at>,
	Liu Junliang <liujl@...ote.com>,
	Erwan Lerale <erwan@...scow.com>
Subject: Re: [loongson-PATCH-v1 24/27] fixup for FUJITSU disk

On Monday 25 May 2009 09:35:48 胡洪兵 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?

Thanks.
Bart
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