From: Jeff Garzik <jeff@garzik.org>
To: Alan Cox <alan@lxorguk.ukuu.org.uk>
Cc: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>,
Krzysztof Halasa <khc@pm.waw.pl>,
linux-ide@vger.kernel.org, lkml <linux-kernel@vger.kernel.org>
Subject: Re: SATA_SIL on IXP425 workaround
Date: Thu, 21 Jan 2010 00:00:02 -0500 [thread overview]
Message-ID: <4B57DF52.2030906@garzik.org> (raw)
In-Reply-To: <20100114210050.2c99c2b1@lxorguk.ukuu.org.uk>
On 01/14/2010 04:00 PM, Alan Cox wrote:
>> I think that you misinterpreted the issue -- according to Krzysztof MMIO
>> works just fine, only 8/16-bit MMIO reads are a problem (please note that
>> using mixed PIO/MMIO access is still a win over pure PIO access and also
>> that sata_sil doesn't support pure non-MMIO operations currently)..
>
> Have we got timing measurements to prove that ?
>>
>> However if it gets fixed in the upstream kernel in some other way I'll
>> simply drop the patch during the next re-base of my tree (I just collect
>> ATA stuff that looks useful/interesting to me and which otherwise may
>> become lost)..
>
> And that's a good thing. The question was aimed at Krzysztof. Really we
> need to keep platform specific weirdness out of core drivers or the
> rapidly turn into a mess.
The lack of 8-/16-byte MMIO access is unfortunately not limited to
Krzysztof's platform. Other people have reported the same problem
specifically with sata_sil (see the archives).
If the driver cannot be converted to all-32-bit accesses, we will need
to do something like Krzysztof's patch.
Jeff
next prev parent reply other threads:[~2010-01-21 5:00 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-11-09 17:31 SATA_SIL on IXP425 workaround Krzysztof Halasa
2010-01-14 15:59 ` Bartlomiej Zolnierkiewicz
2010-01-14 18:08 ` Krzysztof Halasa
2010-01-14 19:22 ` Alan Cox
2010-01-14 20:12 ` Krzysztof Halasa
2010-01-14 21:05 ` Alan Cox
2010-01-16 5:03 ` Robert Hancock
2010-01-14 20:29 ` Bartlomiej Zolnierkiewicz
2010-01-14 21:00 ` Alan Cox
2010-01-21 5:00 ` Jeff Garzik [this message]
2010-01-21 4:58 ` Jeff Garzik
2010-01-21 6:48 ` Jeff Garzik
2010-01-21 18:37 ` Jeff Garzik
2010-01-21 21:47 ` Krzysztof Halasa
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