linux-kernel - Re: Hack to fix not working spindown over Firewire

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Date:	Wed, 7 May 2008 20:00:42 +0200
From:	Tino Keitel <tino.keitel@....de>
To:	linux-kernel@...r.kernel.org, linux-scsi@...r.kernel.org
Subject: Re: Hack to fix not working spindown over Firewire

On Wed, Apr 30, 2008 at 15:31:41 +0200, Stefan Richter wrote:

[...]

> Tino, to find the firmware marker you can for example:
> # echo 0x1000 > /sys/module/sbp2/parameters/workarounds
> Then plug in the disk and
> # dmesg | grep sbp2

I used firewire_sbp2. I hope that's ok.

firewire_sbp2: Please notify linux1394-devel@...ts.sourceforge.net if
you need the workarounds parameter for fw1.0
firewire_sbp2: Workarounds for fw1.0: 0x100 (firmware_revision
0x012804, model_id 0x000001)
firewire_sbp2: fw1.0: logged in to LUN 0000 (0 retries)

[...]

> uninteresting for our purposes.  According to the description of Active,
> Idle, Standby, Sleep in RBC, we do most certainly want code 1 on resume,
> and rather 3 than 2 on suspend. 5 instead of 3 or 2 might even be better

FYI, sg_start --pc=3 also spins down the drive here.

> from the POV of energy consumption but a "device reset may be required
> before access to the device is allowed" which I'd rather not deal with.
> 
> Tino, does the scsi stack log the device as "Direct-Access-RBC" after it
> was plugged in?

Yes:

scsi 7:0:0:0: Direct-Access-RBC WDC WD32 00JB-00KFA0           PQ: 0 ANSI: 4

> 
> Note to self:  Test sg_start --pc={1,3} with all the various SBP-2
> bridges I have access to...

Thanks for your effort.

Regards,
Tino
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