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

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Date:	Thu, 31 May 2007 21:23:35 +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 Do, 24.05.07 11:46 Bartlomiej Zolnierkiewicz <bzolnier@...il.com>
wrote:

> 
> Hi,
> 
> [...]
> 
> Improved patch - this time the issue should be fixed for good (I was
> looking only at the RAID specific part of the fixups and I overlooked
> the fact that the original code was clearing too much of
> id->field_valid), there is now also an extra debugging printk to give
> us some more info.
> 
> Please give it a try.
> 
> [ recal_intr warning (which should be harmless) is not fixed by this
>   patch because it is a different problem and requires some more
> work. ]
> 

Hi,

Sorry again for late response.

This patch works. At least it restores the behaviour before .21 :)
----------------------------
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
it821x: controller in smart 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: field_valid=0007 capability=2f dma_mword=0007 dma_status=04
hde: Performing identify fixups.
hdf: field_valid=0007 capability=2f dma_mword=0007 dma_status=04
hdf: Performing identify fixups.
hde: selected mode 0x22
hdf: selected mode 0x22
ide2 at 0xec00-0xec07,0xe802 on irq 18
hde: max request size: 128KiB
hde: 488397168 sectors (250059 MB) w/8192KiB Cache, CHS=30401/255/63,
DMA hde:hde: recal_intr: status=0x51 { DriveReady SeekComplete Error }
hde: recal_intr: error=0x04 { DriveStatusError }
ide: failed opcode was: unknown
 hde1
hdf: max request size: 128KiB
hdf: 240121728 sectors (122942 MB) w/2048KiB Cache, CHS=65535/16/63, DMA
 hdf:hdf: recal_intr: status=0x51 { DriveReady SeekComplete Error }
hdf: recal_intr: error=0x04 { DriveStatusError }
ide: failed opcode was: unknown
 hdf1
----------------------------------------

hdparm does not complain, and disk IO speed is OK.

Regards,
Tom


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