From mboxrd@z Thu Jan  1 00:00:00 1970
From: James Bottomley <James.Bottomley@SteelEye.com>
Subject: Re: What breaks aic7xxx in post 2.6.12-rc2 ?
Date: Thu, 19 May 2005 20:17:33 -0500
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To: "K.R. Foley" <kr@cybsft.com>
Cc: dino@in.ibm.com, Andrew Morton <akpm@osdl.org>, gregoire.favre@gmail.com, Linux Kernel <linux-kernel@vger.kernel.org>, SCSI Mailing List <linux-scsi@vger.kernel.org>

On Thu, 2005-05-19 at 20:05 -0500, K.R. Foley wrote:
> It does work with the exception that my u160 drive is still identified
> as 80MB/s.

Well, that's some good news, at least.

> May 19 19:36:46 porky kernel: scsi0:A:0:0: Tagged Queuing enabled.  Depth 32
> May 19 19:36:46 porky kernel:  target0:0:0: Beginning Domain Validation
> May 19 19:36:46 porky kernel: WIDTH IS 1
> May 19 19:36:46 porky kernel: (scsi0:A:0): 6.600MB/s transfers (16bit)
> May 19 19:36:46 porky kernel: (scsi0:A:0): 80.000MB/s transfers
> (40.000MHz, offset 127, 16bit)

OK, it looks like the period is limited to 25ns.  Could you confirm
this?

cat /sys/class/spi_transport/target0:0:0/period
cat /sys/class/spi_transport/target0:0:0/max_period

Now, if the max_period is 25, try doing

echo 12.5 > /sys/class/spi_transport/target0:0:0/max_period

and then

echo 1 > /sys/class/spi_transport/target0:0:0/revalidate

to trigger a revalidation of the domain and see if it comes up to 160.

Thanks,

James