linux-kernel - Re: [PATCH] make sata

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Message-ID: <4574ADD0.4060803@pobox.com>
Date:	Mon, 04 Dec 2006 18:22:56 -0500
From:	Jeff Garzik <jgarzik@...ox.com>
To:	Alan <alan@...rguk.ukuu.org.uk>
CC:	andersen@...epoet.org, linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] make sata_promise PATA ports work

Alan wrote:
> On Mon, 4 Dec 2006 12:47:37 -0700
> Erik Andersen <andersen@...epoet.org> wrote:
> 
>> This patch vs 2.6.19, based on the not-actually-working-for-me
>> code lurking in libata-dev.git#promise-sata-pata, makes the PATA
>> ports on my promise sata card actually work.  Since the plan as
> 
> Nice, this is pretty much what is needed to polish up the other split
> PATA/SATA cases.

Disagree.  Internal libata is set up so that you can have different 
ata_port::flags and ata_port::ops for each port, which is what enables 
proper hardware sharing between SATA and PATA.

Two things need to happen:

1) probe_ent needs to permit a driver to supply multiple flags/ops 
pairs, not just one for the whole driver, and pass that through to the 
proper data structures during ata_port init.

2) a VERY FEW details like ->irq_clear() are really ata_host level 
hooks, but they live in ata_port_operations because there is no 
ata_host_operations.  Fix these.

Once those issues are fixed, PATA+SATA can be easily support on the 
combinations of hardware that have been desperately wanting it: 
sata_promise, sata_sis, sata_via (sata_uli too?)

	Jeff

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