lkml.org 
[lkml]   [2011]   [Aug]   [4]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: ahci_start_engine compliance with AHCI spec
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


\
 
 \ /
  Last update: 2011-08-04 11:47    [W:0.103 / U:0.120 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site