From: Jeff Garzik <jeff@garzik.org>
To: Alan Cox <alan@lxorguk.ukuu.org.uk>
Cc: Andrew Morton <akpm@osdl.org>,
Reuben Farrelly <reuben-lkml@reub.net>,
linux-kernel@vger.kernel.org, linux-acpi@vger.kernel.org,
rdunlap@xenotime.net, greg@kroah.com,
john stultz <johnstul@us.ibm.com>, Andi Kleen <ak@muc.de>,
"linux-ide@vger.kernel.org" <linux-ide@vger.kernel.org>
Subject: Re: 2.6.18-rc1-mm1
Date: Sun, 09 Jul 2006 12:29:10 -0400 [thread overview]
Message-ID: <44B12ED6.10000@garzik.org> (raw)
In-Reply-To: <1152449805.27368.57.camel@localhost.localdomain>
Alan Cox wrote:
> The old drivers/ide code uses much longer delays than the spec for some
> ATAPI commands, and it looks as if there is a good reason for doing
> so ...
FWIW, the code that ATADRVR (http://www.ata-atapi.com/) uses to issue
commands does something like
write Command register to start command
if (device == ATAPI) # i.e. not ATA
delay(150 msec)
pound Status / AltStatus, kick DMA engine, whatever else
ATADRVR is open code (for an MS-DOS-level driver), and really worth a
read. Between ATADRVR and drivers/ide, you get a pretty good idea about
what __field experience__ has shown is needed for ATAPI devices.
Jeff
parent reply other threads:[~2006-07-09 16:29 UTC|newest]
Thread overview: expand[flat|nested] mbox.gz Atom feed
[parent not found: <1152449805.27368.57.camel@localhost.localdomain>]
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