lkml.org 
[lkml]   [2011]   [Feb]   [21]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: [PATCH 02/20] ata_piix: unify code for programming PIO and MWDMA timings
Hello.

On 21-02-2011 14:38, Sergei Shtylyov wrote:

>>> PIO mode is setup by different code, and it takes care of the IORDY
>>> setting according to the PIO rules (and it gets called). DMA mode setup should
>>> just ignore the IORDY setting as in all other sane drivers.

>> Well it can't ignore it - but if you mean just keep the bit as is then

> Yes, I mean this.

>> that sounds sensible, have to see what the docs say happens if you ever
>> set MWDMA without IORDY.

> Don't think they say anything on this matter but I can't imagine that IORDY
> matters for DMA.

What it says is that IORDY enable bit has no effect when the fast timing
bit is cleared. That's from ICH IDE PRM (29860004.pdf).

WBR, Sergei


\
 
 \ /
  Last update: 2011-02-21 12:57    [W:0.051 / U:0.040 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site