linux-kernel - Re: [PATCH] pata_it8213: MWDMA0 is unsupported

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Message-Id: <200911261903.01199.bzolnier@gmail.com>
Date:	Thu, 26 Nov 2009 19:03:01 +0100
From:	Bartlomiej Zolnierkiewicz <bzolnier@...il.com>
To:	Sergei Shtylyov <sshtylyov@...mvista.com>,
	Alan Cox <alan@...rguk.ukuu.org.uk>
Cc:	linux-ide@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] pata_it8213: MWDMA0 is unsupported

On Thursday 26 November 2009 07:00:11 pm Bartlomiej Zolnierkiewicz wrote:
> On Thursday 26 November 2009 06:23:18 pm Sergei Shtylyov wrote:
> > Bartlomiej Zolnierkiewicz wrote:
> > 
> > >>MWDMA0 timings cannot be met with the PIIX based controller
> > >>programming interface.
> > 
> > >>This change should be safe as this is how we have been doing
> > >>things in IDE it8213 host driver for years.
> > 
> > >>Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@...il.com>
> > >>---
> > >>Verified with the documentation (similar case as with pata_efar).
> > 
> > > Uhhh, no...
> > 
> > > Too many damn drivers.
> > 
> > > Too much damn duplication.
> > 
> > > Too much damn subtle differences here and there.
> > 
> > > The hardware is probably fine for MWMDA0 when it comes to pata_{efar,it8213},
> > > it just not documented properly in the data sheet.
> > 
> >     How so with pata_efar? The active/recovery bitfields are still 2-bit 
> > wide, no?
> 
> Yes but when TIMEx bit is disabled we are using XFER_PIO_SLOW timings.
> 
> All data sheets including original Intel ones are a complete crap when it
> comes to explicitly documenting this behavior.

OTOH all drivers set TIMEx for MWDMA0 currently.. ?

--
Bartlomiej Zolnierkiewicz
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