From: Jeff Garzik <jeff@garzik.org>
To: Alan Cox <alan@lxorguk.ukuu.org.uk>
Cc: Pavel Machek <pavel@ucw.cz>,
Kristen Carlson Accardi <kristen.c.accardi@intel.com>,
Theodore Tso <tytso@mit.edu>,
linux-ide@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH] ata: ahci: power off unused ports
Date: Mon, 02 Jun 2008 03:43:35 -0400 [thread overview]
Message-ID: <4843A4A7.3020809@garzik.org> (raw)
In-Reply-To: <20080602080440.25fc663c@core>
Alan Cox wrote:
>> If you are talking about SATA -- incorrect.
>>
>> The patch deals with policy, and the user MUST have the ability to
>> control this stuff. Otherwise you create a situation where the user
>> might be denied hotplug use in valid cases, or similar negative situations.
>
> The policy isn't however complicated. Tejun added the stuff for forcing
> cable type and mode on setup and has therefore written all the per device
> setup code we might need. Alternatively a single
>
> foo=1/0
>
> option has been fine for acpi and will do fine for this. Total additional
> cost - 1 line.
The key requirement is per-port control. Ideally via hdparm or another
userspace tool, but kernel command line (module options) or sysfs would
be just fine too. And agreed, the minimal you need is simply 1/0 for
the port's policy.
Jeff
next prev parent reply other threads:[~2008-06-02 7:43 UTC|newest]
Thread overview: 41+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-05-08 23:10 [PATCH] ata: ahci: power off unused ports Kristen Carlson Accardi
2008-05-08 23:37 ` Matthew Garrett
2008-05-08 23:35 ` Kristen Carlson Accardi
2008-05-09 0:14 ` Matthew Garrett
2008-05-09 0:28 ` Kristen Carlson Accardi
2008-05-09 15:58 ` Lennart Sorensen
2008-05-09 16:06 ` Matthew Garrett
2008-05-09 16:14 ` Lennart Sorensen
2008-05-09 17:14 ` Kristen Carlson Accardi
2008-05-09 17:14 ` Kristen Carlson Accardi
2008-05-09 15:06 ` Mark Lord
2008-05-09 15:28 ` Port control interface (was Re: [PATCH] ata: ahci: power off unused ports) Jeff Garzik
2008-05-27 3:08 ` [PATCH] ata: ahci: power off unused ports Theodore Tso
2008-05-27 21:32 ` Kristen Carlson Accardi
2008-05-27 22:59 ` Theodore Tso
2008-05-27 23:32 ` Kristen Carlson Accardi
2008-05-31 8:00 ` Pavel Machek
2008-06-01 19:16 ` Jeff Garzik
2008-06-02 7:04 ` Alan Cox
2008-06-02 7:43 ` Jeff Garzik [this message]
2008-06-02 8:22 ` Alan Cox
2008-06-02 9:48 ` Jeff Garzik
2008-06-02 13:54 ` Alan Cox
2008-06-02 16:55 ` Kristen Carlson Accardi
2008-06-02 13:03 ` Mark Lord
2008-06-02 16:07 ` Jeff Garzik
2008-06-02 17:00 ` Kristen Carlson Accardi
2008-06-02 17:45 ` Jeff Garzik
2008-06-02 17:47 ` Kristen Carlson Accardi
2008-06-02 18:15 ` Jeff Garzik
2008-06-02 18:16 ` Kristen Carlson Accardi
2008-06-02 18:30 ` Ric Wheeler
2008-06-02 18:40 ` Jeff Garzik
2008-06-02 18:49 ` Ric Wheeler
2008-06-02 18:52 ` Jeff Garzik
2008-06-02 20:00 ` Matthew Garrett
2008-06-02 18:38 ` Jeff Garzik
2008-06-03 16:49 ` Kristen Carlson Accardi
2008-06-02 17:07 ` Greg Freemyer
2008-06-02 16:57 ` Kristen Carlson Accardi
2008-06-02 17:44 ` Jeff Garzik
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