* Re: 2.6.18-rc1-mm1
[not found] ` <1152449805.27368.57.camel@localhost.localdomain>
@ 2006-07-09 16:29 ` Jeff Garzik
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From: Jeff Garzik @ 2006-07-09 16:29 UTC (permalink / raw)
To: Alan Cox
Cc: Andrew Morton, Reuben Farrelly, linux-kernel, linux-acpi, rdunlap,
greg, john stultz, Andi Kleen, linux-ide@vger.kernel.org
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
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