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From: Jan Evert van Grootheest <j.e.van.grootheest@caiway.nl>
To: linux-ide@vger.kernel.org, bzolnier@gmail.com
Subject: DMA on ht6560b?
Date: Mon, 18 Feb 2008 15:13:53 +0100	[thread overview]
Message-ID: <47B992A1.2030008@caiway.nl> (raw)

Hi,

With digging into the code...

I think the ht6560b controller supports DMA. At least it did so in 2.2 
(where hdparm could still turn it on). DMA in 2.2 would improve the HD 
from about 1M/s to 4M/s. So that's quite interesting.
Also the datasheet claims that there is full ANSI ATA-4a support. 
According to the ATA table on wikipedia that should include up to mwdma 
2 and udma33.

What's the magic that will turn it on for the ht6560b controller?
I would guess at the [sm]wdma_mask fields in hwif_t? Plus something for 
set_dma_mode?
Some help would be appreciated.

Thanks,
Jan Evert


             reply	other threads:[~2008-02-18 14:13 UTC|newest]

Thread overview: 4+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2008-02-18 14:13 Jan Evert van Grootheest [this message]
2008-02-18 14:30 ` DMA on ht6560b? Alan Cox
2008-02-18 15:17   ` Jan Evert van Grootheest
2008-02-18 15:43     ` Alan Cox

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