From: Benjamin Herrenschmidt <benh-XVmvHMARGAS8U2dJNN8I7kB+6BGkLq7r@public.gmane.org>
To: Alan Stern <stern-nwvwT67g6+6dFdvTe/nMLpVzexx5G7lz@public.gmane.org>
Cc: Linux-pm mailing list <linux-pm-qjLDD68F18O7TbgM5vRIOg@public.gmane.org>
Subject: Re: comments on irc log
Date: Sat, 19 Mar 2005 10:07:57 +1100 [thread overview]
Message-ID: <1111187278.1236.187.camel@gaston> (raw)
In-Reply-To: <Pine.LNX.4.44L0.0503181147110.1099-100000-3WpdWqXrU/qjv4eRiOYp3g@public.gmane.org>
[-- Attachment #1: Type: text/plain, Size: 764 bytes --]
> Usually very fast. Unfortunately for some kinds of USB host controllers
> it can be relatively slow, since quiescing the controller has an
> unavoidable side effect of suspending all devices on the bus.
I wonder if we need to quiesce the controller in fact for FREEZE.
Probably not. Just stop all queue processing and refuse URBs. The hcca
will still get updated, but who cares ? it will end up beeing saved in
an inconsistent state in the suspend image, so what ? On resume, we will
have rebooted, we can "clean it up".
This is sort-of breaking the rule of "no DMA", and thus is not suitable
for kexec (which is ok, kexec currently uses the separate "shutdown"
callback which must switch DMA off), but would fix the problem for
suspend to disk...
Ben.
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next prev parent reply other threads:[~2005-03-18 23:07 UTC|newest]
Thread overview: 24+ messages / expand[flat|nested] mbox.gz Atom feed top
2005-03-18 2:32 comments on irc log Benjamin Herrenschmidt
2005-03-18 16:56 ` Alan Stern
[not found] ` <Pine.LNX.4.44L0.0503181147110.1099-100000-3WpdWqXrU/qjv4eRiOYp3g@public.gmane.org>
2005-03-18 18:14 ` Pavel Machek
2005-03-18 23:07 ` Benjamin Herrenschmidt [this message]
2005-03-18 23:18 ` Pavel Machek
[not found] ` <20050318231801.GE24449-I/5MKhXcvmPrBKCeMvbIDA@public.gmane.org>
2005-03-19 1:21 ` Benjamin Herrenschmidt
2005-03-19 3:23 ` Alan Stern
[not found] ` <Pine.LNX.4.44L0.0503182205040.30560-100000-pYrvlCTfrz9XsRXLowluHWD2FQJk+8+b@public.gmane.org>
2005-03-19 10:33 ` Pavel Machek
[not found] ` <20050319103351.GM24449-I/5MKhXcvmPrBKCeMvbIDA@public.gmane.org>
2005-03-19 15:49 ` Alan Stern
2005-03-19 12:02 ` Benjamin Herrenschmidt
2005-03-19 10:32 ` Pavel Machek
2005-03-18 18:13 ` Pavel Machek
[not found] ` <20050318181317.GD18427-I/5MKhXcvmPrBKCeMvbIDA@public.gmane.org>
2005-03-18 23:15 ` Benjamin Herrenschmidt
2005-03-21 20:06 ` Jordan Crouse
[not found] ` <20050321130612.135d726e-aftB2sG12IhaqnLngUycEA@public.gmane.org>
2005-03-21 20:03 ` Pavel Machek
2005-03-23 19:46 ` David Brownell
[not found] ` <200503231146.17105.david-b-yBeKhBN/0LDR7s880joybQ@public.gmane.org>
2005-03-23 19:53 ` David Brownell
[not found] ` <200503231153.48230.david-b-yBeKhBN/0LDR7s880joybQ@public.gmane.org>
2005-03-23 20:16 ` Todd Poynor
[not found] ` <4241CE9B.5050604-Igf4POYTYCDQT0dZR+AlfA@public.gmane.org>
2005-03-23 20:46 ` David Brownell
[not found] ` <200503231246.05656.david-b-yBeKhBN/0LDR7s880joybQ@public.gmane.org>
2005-03-24 1:57 ` Todd Poynor
2005-03-23 21:08 ` Pavel Machek
[not found] ` <20050323210835.GF30704-I/5MKhXcvmPrBKCeMvbIDA@public.gmane.org>
2005-03-23 21:33 ` David Brownell
[not found] ` <200503231333.22647.david-b-yBeKhBN/0LDR7s880joybQ@public.gmane.org>
2005-03-23 21:53 ` Pavel Machek
[not found] ` <20050323215330.GJ30704-I/5MKhXcvmPrBKCeMvbIDA@public.gmane.org>
2005-03-24 18:40 ` Patrick Mochel
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