Thread (11 messages) 11 messages, 3 authors, 2011-08-04

Re: ahci_start_engine compliance with AHCI spec

From: Tejun Heo <tj@kernel.org>
Date: 2011-08-04 09:44:29
Also in: lkml

Hello,

On Tue, Aug 02, 2011 at 05:06:13PM -0700, Brian Norris wrote:
Can DRQ be set from 0->1 without a software-initiated action? I didn't
think it was directly tied to PHY events, and so we can fairly well
predict that it will remain 0.
Sure it can.  It's updated by Register D2H FISes sent by the device.
It can change after a PHY event; otherwise, I don't think it would get
set during init without any command in flight, right?
Yes, I believe the hardware designers know how buggy this is...but
it's still worth some effort to fix the software as well as possible
for current hardware behavior.
Yeap, sure, let's get it working for majority of cases.  I just wanted
to point out that the hardware eventually needs to be fixed.

Thanks.

-- 
tejun
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