From: Jeff Garzik <jgarzik@pobox.com>
To: Alan Cox <alan@lxorguk.ukuu.org.uk>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>,
Alan Cox <alan@redhat.com>, Linux IDE <linux-ide@vger.kernel.org>
Subject: Re: [PATCH] libata: Add MMIO support to pata_sil680
Date: Thu, 24 May 2007 07:09:56 -0400 [thread overview]
Message-ID: <46557284.3050301@pobox.com> (raw)
In-Reply-To: <20070524120915.40b594a8@the-village.bc.nu>
Alan Cox wrote:
> On Thu, 24 May 2007 06:52:13 -0400
> Jeff Garzik <jgarzik@pobox.com> wrote:
>
>> Alan Cox wrote:
>>>> Currently libata does the 400ns thingy in the inline ata_pause() which
>>>> unconditionally does ata_altstatus(); ndelay(400); (and thus does it on
>>>> PIO, MMIO, anything ...).
>>> It might actually improve performance for PATA if we did as we'll get rid
>>> of an excess (expensive) PCI read access for non MMIO cases.
>> The spec says you should read AltStatus. I am definitely not inclined
>> to change that part.
>
> Which spec says that and where ?
It's buried in the host state diagrams IIRC. I'll dig it up tomorrow if
nobody beats me to it.
Jeff
next prev parent reply other threads:[~2007-05-24 11:10 UTC|newest]
Thread overview: 46+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-05-15 6:12 [PATCH] libata: Add MMIO support to pata_sil680 Benjamin Herrenschmidt
2007-05-15 6:14 ` Benjamin Herrenschmidt
2007-05-23 13:42 ` Alan Cox
2007-05-23 22:48 ` Benjamin Herrenschmidt
2007-05-23 23:31 ` Alan Cox
2007-05-23 23:43 ` Benjamin Herrenschmidt
2007-05-24 0:13 ` Alan Cox
2007-05-24 3:42 ` Benjamin Herrenschmidt
2007-05-24 9:54 ` Alan Cox
2007-05-24 10:52 ` Jeff Garzik
2007-05-24 11:09 ` Alan Cox
2007-05-24 11:09 ` Jeff Garzik [this message]
2007-05-25 0:29 ` Jeff Garzik
2007-05-25 0:40 ` Alan Cox
2007-05-25 0:51 ` Jeff Garzik
2007-05-25 14:20 ` Alan Cox
2007-05-28 2:21 ` Jeff Garzik
2007-05-24 6:02 ` Jeff Garzik
2007-05-24 9:33 ` Alan Cox
2007-05-24 9:55 ` Jeff Garzik
2007-05-24 10:08 ` Benjamin Herrenschmidt
2007-05-24 20:56 ` Mark Lord
2007-05-24 22:52 ` Benjamin Herrenschmidt
2007-05-25 11:32 ` Mark Lord
2007-05-24 10:06 ` Benjamin Herrenschmidt
-- strict thread matches above, loose matches on Subject: below --
2008-02-12 15:58 Tim Ellis
2008-02-12 21:02 ` Benjamin Herrenschmidt
2008-02-12 21:42 ` Alan Cox
2008-02-15 15:52 ` Guennadi Liakhovetski
2008-02-15 15:53 ` Alan Cox
2008-02-15 21:45 ` Benjamin Herrenschmidt
2008-02-15 22:27 ` Alan Cox
2008-02-15 22:55 ` Benjamin Herrenschmidt
2008-02-15 23:56 ` Tim Ellis
2008-02-25 22:57 ` Jeff Garzik
2008-02-25 23:06 ` Guennadi Liakhovetski
2008-02-26 0:58 ` Benjamin Herrenschmidt
2008-02-15 21:36 ` Benjamin Herrenschmidt
2007-05-16 0:21 Benjamin Herrenschmidt
2007-05-16 12:05 ` Alan Cox
2007-05-16 12:12 ` Benjamin Herrenschmidt
2007-05-18 1:00 ` Jeff Garzik
2007-05-15 6:11 Benjamin Herrenschmidt
2007-05-15 6:14 ` Benjamin Herrenschmidt
2007-05-15 11:08 ` Alan Cox
2007-05-15 20:32 ` Benjamin Herrenschmidt
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