From: Johannes Stezenbach <js@sig21.net>
To: Stefan Richter <stefanr@s5r6.in-berlin.de>
Cc: "Tim Bird" <tim.bird@am.sony.com>,
"Josh Boyer" <jwboyer@gmail.com>, "Jörn Engel" <joern@logfs.org>,
linux-embedded <linux-embedded@vger.kernel.org>,
"linux kernel" <linux-kernel@vger.kernel.org>
Subject: Re: Recommendation for activating a deferred module init in the kernel
Date: Wed, 18 Jun 2008 11:38:12 +0200 [thread overview]
Message-ID: <20080618093812.GB26377@sig21.net> (raw)
In-Reply-To: <48585282.4020508@s5r6.in-berlin.de>
On Wed, Jun 18, 2008, Stefan Richter wrote:
> Johannes Stezenbach wrote:
>> I think the USB bus enumeration can take significant time:
>> recognize a device is connected, turn on bus power, try
>> to read descriptors (bus powered devices might be slow to
>> respond after power up). And this will happen even with
>> drivers_autoprobe == 0, right?
>
> Probably... I don't know which particular steps happen in the USB core
> before upper layer drivers are bound. Not binding the [eou]hci-hcd PCI
> driver would certainly be more effective.
Well, in embedded systems you often don't have a PCI bus,
but platform devices. Maybe it's as simple as delaying
the USB platform_device_register() call, I don't know.
Johannes
next prev parent reply other threads:[~2008-06-18 9:38 UTC|newest]
Thread overview: 30+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-06-17 18:23 Recommendation for activating a deferred module init in the kernel Tim Bird
2008-06-17 18:51 ` David VomLehn
2008-06-17 19:07 ` Jörn Engel
2008-06-17 19:22 ` Jim Freeman
2008-06-17 20:06 ` Tim Bird
2008-06-17 19:52 ` Tim Bird
2008-06-17 19:55 ` Tim Bird
2008-06-17 20:23 ` Jörn Engel
2008-06-17 20:35 ` Josh Boyer
2008-06-17 22:48 ` Stefan Richter
2008-06-18 0:03 ` Johannes Stezenbach
2008-06-18 0:10 ` Stefan Richter
2008-06-18 9:38 ` Johannes Stezenbach [this message]
2008-06-17 20:19 ` Jörn Engel
2008-06-18 12:38 ` Amol Lad
[not found] ` <4858A659.8030502@codefidence.com>
2008-06-18 16:08 ` Tim Bird
[not found] ` <4859ECF3.3000500@codefidence.com>
2008-06-19 17:58 ` Tim Bird
2008-06-22 7:08 ` Gilad Ben-Yossef
2008-06-23 17:40 ` Tim Bird
2008-07-01 14:20 ` Gilad Ben-Yossef
-- strict thread matches above, loose matches on Subject: below --
2008-06-18 6:47 Gilad Ben-Yossef
2008-06-18 8:20 ` David Woodhouse
2008-06-18 8:32 ` David Woodhouse
2008-06-18 8:52 ` Adrian Bunk
2008-06-18 8:57 ` Geert Uytterhoeven
2008-06-18 9:59 ` David Woodhouse
2008-06-18 10:33 ` Adrian Bunk
2008-06-18 10:41 ` David Woodhouse
2008-06-18 11:37 ` Geert Uytterhoeven
2008-06-18 14:56 ` Nicolas Pitre
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