lkml.org 
[lkml]   [2008]   [Jun]   [18]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: Recommendation for activating a deferred module init in the kernel
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


\
 
 \ /
  Last update: 2008-06-18 11:41    [W:0.058 / U:0.496 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site