linux-kernel - Re: [PATCH 13/15] ide: fix UDMA/MWDMA/SWDMA masks

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Date:	Wed, 31 Jan 2007 23:38:08 +0300
From:	Sergei Shtylyov <sshtylyov@...mvista.com>
To:	Alan <alan@...rguk.ukuu.org.uk>
Cc:	Bartlomiej Zolnierkiewicz <bzolnier@...il.com>,
	linux-ide@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 13/15] ide: fix UDMA/MWDMA/SWDMA masks

Hello.

Alan wrote:

>>    Ugh, I'm not seeing any *actual* support for MW/SW DMA in this driver... 

> Thats long been broken. Should be correct in the libata driver

    I've looked thru the specs and it seemed to me that ULi hardware is much 
broken PIO wise: their max active time is 8 cycles even on taskfile access 
which gives 240 ns while standard requeires 290 ns for modes 0 thru 2...

    I've also noted that the tuneproc() method in both cmd64x.c and alim15x3.c 
seems to misdo recovery calculation, taking address setup into account -- that 
should be slightly overclocking PIO modes 0/1 (ULi docs don't shed much light 
on how it should be calculated)... Well, this seems fixed in libata drivers.

> Alan

MBR, Sergei
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