linux-kernel - Re: libata pata_pdc2027x success on sparc64

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Message-ID: <44BD2370.8090506@ru.mvista.com>
Date:	Tue, 18 Jul 2006 22:07:44 +0400
From:	Sergei Shtylyov <sshtylyov@...mvista.com>
To:	Mikael Pettersson <mikpe@...uu.se>
Cc:	albertcc@...ibm.com, linux-ide@...r.kernel.org,
	linux-kernel@...r.kernel.org, alan@...hat.com
Subject: Re: libata pata_pdc2027x success on sparc64

Hello.

Mikael Pettersson wrote:

> In contrast, the old IDE pdc202xx_new driver had lots
> of problems with CRC errors causing it to disable DMA.

    Hm, from my experience it usually falls back to UltraDMA/44 and then the 
thing startrt working...

> I wasn't able to manually tune it above udma3 without
> getting more errors. This isn't sparc64-specific: I've
> had similar negative experience with the old IDE Promise
> drivers in a PowerMac.

    This happens because the "old" driver misses the PLL calibration code.
    You may want to try these Albert's patches:

http://marc.theaimsgroup.com/?t=110992452800002&r=1&w=2
http://marc.theaimsgroup.com/?t=110992471500002&r=1&w=2
http://marc.theaimsgroup.com/?t=110992490100002&r=1&w=2
http://marc.theaimsgroup.com/?t=111019238400003&r=1&w=2

    It looks like they were never considered for accepting into the kernel
while they succesfully solve this issue. Maybe Albert could try pushing them 
into -mm tree once more?

WBR, Sergei

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