linux-kernel - Re: IT821x: no DMA since 2.6.21

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Message-ID: <20070516100924.11273ce4@SiRiUS.home>
Date:	Wed, 16 May 2007 10:09:24 +0200
From:	Thomas Kuther <gimpel@...nenkinder.org>
To:	Bartlomiej Zolnierkiewicz <bzolnier@...il.com>
Cc:	Alan Cox <alan@...rguk.ukuu.org.uk>, linux-kernel@...r.kernel.org,
	linux-ide@...r.kernel.org
Subject: Re: IT821x: no DMA since 2.6.21

On Mi, 16.05.07 02:58 Bartlomiej Zolnierkiewicz wrote:

> 
> Hi,
> 
> On Tuesday 15 May 2007, Alan Cox wrote:
> > On Tue, 15 May 2007 12:53:08 +0200
> > Thomas Kuther <gimpel@...nenkinder.org> wrote:
> > 
> > > Hi!
> > > 
> > > Since 2.6.21 I have a problem with the it821x driver on my ITE
> > > 8212 controller.
> > > Now I saw some updates to it821x in 2.6.22-rc1 and gave that a
> > > try, but the problem persists.
> > 
> > I've had multiple reports of this. I would recommend you use the
> > libata driver. IT821x hasn't changed over the past few releases so
> > its someting
> 
> commit 0e9b4e535fec7e2a189952670937adfbe2826b63
> Author: Bartlomiej Zolnierkiewicz <bzolnier@...il.com>
> Date:   Sat May 5 22:03:50 2007 +0200
> 
>     it821x: PIO mode setup fixes
> 
> ...
> 
> *cough, cough* ;)
> 
> > in the core IDE code that broke it [note it might not of course be
> > that the problem is in the core code..].
> 
> The real problem seems to be that IT821x "virtual" ID misses info
> about supported DMA modes (while it seems to contain enabled DMA
> mode info).
> 
> This would be the logical explanation why the driver broke after:
> 
> [...]
> 
> It seems that somebody has already debugged this issue to
> the aforementioned changes:
> 
> http://lkml.org/lkml/2007/1/14/110
> 
> 
> Thomas, does the following patch against 2.6.22-rc1 fix the issue?
> 

Hi Bartlomiej,

yes, this patch completely fixes it. Looks very good now even.
I loaded it with option noraid=1

------------------------------8<----------------------------
IT8212: IDE controller at PCI slot 0000:00:09.0
ACPI: PCI Interrupt 0000:00:09.0[A] -> GSI 17 (level, low) -> IRQ 18
IT8212: chipset revision 17
it8212: forcing bypass mode.
it821x: controller in pass through mode.
IT8212: 100% native mode on irq 18
    ide2: BM-DMA at 0xdc00-0xdc07, BIOS settings: hde:pio, hdf:pio
    ide3: BM-DMA at 0xdc08-0xdc0f, BIOS settings: hdg:pio, hdh:pio
Probing IDE interface ide2...
hde: SAMSUNG SP2514N, ATA DISK drive
hdf: Maxtor 6Y120L0, ATA DISK drive
hde: selected mode 0x45
hdf: selected mode 0x46
ide2 at 0xec00-0xec07,0xe802 on irq 18
hde: max request size: 512KiB
hde: 488397168 sectors (250059 MB) w/8192KiB Cache, CHS=30401/255/63,
UDMA(100) hde: cache flushes supported
 hde: hde1
hdf: max request size: 128KiB
hdf: 240121728 sectors (122942 MB) w/2048KiB Cache, CHS=65535/16/63,
UDMA(133) hdf: cache flushes supported
-------------------------------------->8------------------------------
So all those drive seek errors are gone too.
Hdparm does not complain anymore, speed is OK.
Nice, so I can get rid of libata again, as all other drives run with the
IDE layer too. 

Many thanks!

Shall I test it without "noraid=1" too? 

Regards,
Thomas

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