From: Benjamin Herrenschmidt <benh@kernel.crashing.org>
To: Alan Stern <stern@rowland.harvard.edu>
Cc: linux-usb@vger.kernel.org,
"linuxppc-dev@ozlabs.org" <linuxppc-dev@ozlabs.org>,
Mark Miesfeld <mmiesfeld@amcc.com>, Stefan Roese <sr@denx.de>
Subject: Re: [RFC][USB] powerpc: Workaround for the PPC440EPX USBH_23 errata
Date: Fri, 29 Aug 2008 08:43:26 +1000 [thread overview]
Message-ID: <1219963406.13162.368.camel@pasglop> (raw)
In-Reply-To: <Pine.LNX.4.44L0.0808281727090.4308-100000@iolanthe.rowland.org>
On Thu, 2008-08-28 at 17:33 -0400, Alan Stern wrote:
> Is there some reason why it doesn't work already? All the patch does
> is suspend the OHCI root hub when you plug in the memory stick -- but
> the root hub should already be suspended.
>
> Unless the memory stick is already plugged in when the kernel boots.
> In which case the root hub won't be suspended -- it won't suspend
> until
> 1 second after ohci-hcd initializes the controller. Is that the
> scenario you're worried about?
I suppose some embedded platforms don't use CONFIG_PM, is this still a
requirement for autosuspend ? Or do that happen always on an empty port
nowadays ?
Cheers,
Ben.
next prev parent reply other threads:[~2008-08-28 22:43 UTC|newest]
Thread overview: 18+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-08-26 22:23 [RFC][USB] powerpc: Workaround for the PPC440EPX USBH_23 errata Vitaly Bordug
2008-08-27 14:36 ` Alan Stern
2008-08-28 19:32 ` Vitaly Bordug
2008-08-28 20:13 ` Alan Stern
2008-08-28 21:11 ` Steven A. Falco
2008-08-28 21:33 ` Alan Stern
2008-08-28 22:43 ` Benjamin Herrenschmidt [this message]
2008-08-29 15:26 ` Alan Stern
2008-08-29 18:20 ` Vitaly Bordug
2008-08-29 21:30 ` Alan Stern
2008-09-04 20:48 ` Vitaly Bordug
2008-09-04 21:40 ` Alan Stern
2008-09-05 1:35 ` Benjamin Herrenschmidt
2008-09-05 13:01 ` Vitaly Bordug
2008-09-05 15:17 ` Alan Stern
2008-09-06 9:02 ` Vitaly Bordug
2008-08-29 13:25 ` Steven A. Falco
2008-08-29 17:56 ` Matthias Fuchs
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