Messages in this thread | | | Date | Mon, 21 Feb 2011 14:53:28 +0300 | From | Sergei Shtylyov <> | Subject | Re: [PATCH 02/20] ata_piix: unify code for programming PIO and MWDMA timings |
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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
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