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

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Message-ID: <tkrat.635f52f7035be2bc@s5r6.in-berlin.de>
Date:	Sat, 10 May 2008 17:31:53 +0200 (CEST)
From:	Stefan Richter <stefanr@...6.in-berlin.de>
To:	linux1394-devel@...ts.sourceforge.net
cc:	linux-kernel@...r.kernel.org, linux-scsi@...r.kernel.org,
	Tino Keitel <tino.keitel@....de>
Subject: Re: Hack to fix not working spindown over Firewire

I wrote:
> 1) FireWire to IDE or to SATA chipset
> 2) start bit is honored:
>    "sg_start --stop" stops the motor and "sg_start" restarts it
> 3) power condition field is honored:
>    "sg_start --pc=3" stops the motor and "sg_start --pc=1 restarts it
> 4) peripheral device type claimed by the firmware
> 5) vendor and model of the enclosure
> 
> 
> 1)           2)     3)     4)    5)
> bridge       start  pc     PDT   enclosure
> --------------------------------------------------------------
> INIC-2430    yes    yes    SBC   AVLAB 2.5" Drive Kit
> INIC-2430    yes    yes    SBC   IOI FWB-IDE01AB, 1 HDD
> INIC-2430    yes    yes    SBC   IOI FWB-IDE01AB, 2 HDDs, JBOD
> 
> OXFW911      yes    yes    RBC   MacPower Icecube
> OXUF922      yes    yes    RBC   MacPower Icecube 800+
> OXFW912      yes    yes    RBC   MacPower Igloo
> OXFW912      yes    yes    RBC   VulcanTech DualDrive 2nd gen.
> OXUF924DSB   yes    yes    SBC   MacPower Taurus, 1 HDD
> OXUF924DSB   no     no     SBC   MacPower Taurus, 2 HDDs, JBOD
> 
> PL-3507      no     no     RBC   MacPower Prefect II ¹

  PL-3507      no     yes    RBC   Mapower MAP-KC21C1 ²

> TSB42AA9     no     yes    SBC   DViCO MomoBay CX-1
> TSB42AA9A    yes    yes    RBC   DViCO MomoBay FX-3A

  EFI firmware no     no     RBC   Apple Mac mini x86 in target mode ³


¹) As mentioned, with firmware from MacPower.

²) Same firmware_revision as with Tino's disk, i.e. apparently firmware
   from Prolific.  Same findings as Tino's:
   "sg_start --stop" is accepted but does not stop the motor.
   "sg_start --pc=3" or "=2" stop the motor.
   "sg_start --pc=1" or a read command restarts the motor.
   "sg_start" does not restart the motor.

³) "sg_start --stop" is accepted but does not stop the motor.
   "sg_start --pc=3" or "=1" fails with "invalid field in cdb".
   This is of course against the spec, because RBC includes power
   condition.

Moreover, when OS X shuts down, it apparently sends START STOP UNIT
without power condition to FireWire disks.  Therefore we also should
rather _not_ use power condition per default.

I will send a patch which uses the power condition field only for
PL-3507 and DViCO CX-1.
-- 
Stefan Richter
-=====-==--- -=-= -=-=-
http://arcgraph.de/sr/

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