From: Mark Lord <liml@rtr.ca>
To: Jeff Garzik <jeff@garzik.org>
Cc: "Williams, Dan J" <dan.j.williams@intel.com>,
htejun@gmail.com, linux-ide@vger.kernel.org, jeremy@sgi.com
Subject: Re: sata_vsc with iq3124h regression in 2.6.20
Date: Sat, 10 Feb 2007 16:08:01 -0500 [thread overview]
Message-ID: <45CE3431.1040209@rtr.ca> (raw)
In-Reply-To: <45CCF6BD.9020404@garzik.org>
Jeff Garzik wrote:
>
> As I recall, the 31244 and VSC-7174 always send an interrupt, so the
> driver should account for this. I thought we had code already in the
> driver to handle this, but perhaps recent changes stomped that.
>
> It would be good to standardize the way we handle these sorts of
> controllers, because (I think) Mark Lord has the same problem on
> sata_qstor (or pdc_adma?).
sata_qstor has a different problem.
For IDENTIFY and other non-R/W commands, it behaves nicely
as a simple, dumb, PIO style interface.
For regular block I/O R/W commands, it uses full DMA with
the internal host queue, depth=1, *but* requires NIEN=1
during such commands.
It's on my near-term "to fix" list, along with migration to the new EH stuff.
Cheers
next prev parent reply other threads:[~2007-02-10 21:08 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-02-09 22:21 sata_vsc with iq3124h regression in 2.6.20 Williams, Dan J
2007-02-09 22:33 ` Jeff Garzik
2007-02-10 14:58 ` Tejun Heo
2007-02-10 21:08 ` Mark Lord [this message]
-- strict thread matches above, loose matches on Subject: below --
2007-02-09 23:26 Dan Williams
2007-02-12 3:19 ` Tejun Heo
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