From: Paul Mackerras <paulus@samba.org>
To: Pavel Machek <pavel@ucw.cz>
Cc: Johannes Berg <johannes@sipsolutions.net>,
linux-pm@lists.linux-foundation.org
Subject: Re: [PATCH v4] pm_ops: add system quiesce/activate hooks
Date: Sun, 15 Apr 2007 02:55:13 +1000 [thread overview]
Message-ID: <17953.1905.510261.169936@cargo.ozlabs.ibm.com> (raw)
In-Reply-To: <20070413221652.GR28264@elf.ucw.cz>
Pavel Machek writes:
> I see ppc as being really special here.
It is, I guess. The salient point is that once the decrementer has an
interrupt pending, the only way to clear it is to take the interrupt.
There is no explicit access to the interrupt pending bit and no
separate enable bit for its interrupt, only the global interrupt
enable for the whole CPU. We have to turn on the global interrupt
enable when finally putting the system into the suspend state (for
suspend to RAM), otherwise on some machines we'll never wake up again.
Effectively, when dealing with the decrementer during preparation for
suspend-to-RAM, we may need to have interrupts enabled briefly in
order to clear a pending decrementer interrupt.
Paul.
next prev parent reply other threads:[~2007-04-14 16:55 UTC|newest]
Thread overview: 90+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-04-05 21:54 [PATCH] pm_ops: add irq enable/disable hooks Johannes Berg
2007-04-05 23:30 ` Rafael J. Wysocki
2007-04-05 23:28 ` Johannes Berg
2007-04-06 0:02 ` Rafael J. Wysocki
2007-04-06 0:09 ` Johannes Berg
2007-04-06 0:17 ` Rafael J. Wysocki
2007-04-06 8:48 ` Johannes Berg
2007-04-06 9:41 ` Rafael J. Wysocki
2007-04-06 9:44 ` Johannes Berg
2007-04-06 10:02 ` Rafael J. Wysocki
2007-04-06 10:00 ` Johannes Berg
2007-04-06 19:19 ` Pavel Machek
2007-04-06 21:59 ` Johannes Berg
2007-04-10 11:36 ` Pavel Machek
2007-04-10 11:45 ` Johannes Berg
2007-04-10 12:00 ` Pavel Machek
2007-04-10 13:42 ` Johannes Berg
2007-04-11 11:22 ` Benjamin Herrenschmidt
2007-04-11 14:07 ` Alan Stern
2007-04-11 16:39 ` Johannes Berg
2007-04-11 21:40 ` Benjamin Herrenschmidt
2007-04-11 11:15 ` Johannes Berg
2007-04-06 19:16 ` Pavel Machek
2007-04-11 15:54 ` [PATCH v2] pm_ops: add system quiesce/activate hooks Johannes Berg
2007-04-11 20:47 ` Dmitry Krivoschekov
2007-04-12 8:39 ` Johannes Berg
2007-04-12 8:42 ` Benjamin Herrenschmidt
2007-04-12 10:16 ` Pavel Machek
2007-04-12 10:45 ` Rafael J. Wysocki
2007-04-12 10:47 ` Johannes Berg
2007-04-13 21:00 ` Pavel Machek
2007-04-13 21:11 ` Johannes Berg
2007-04-13 21:43 ` Pavel Machek
2007-04-13 21:11 ` Paul Mackerras
2007-04-13 21:15 ` Benjamin Herrenschmidt
2007-04-12 11:23 ` Benjamin Herrenschmidt
2007-04-12 15:03 ` Rafael J. Wysocki
2007-04-12 16:32 ` David Brownell
2007-04-13 6:52 ` Johannes Berg
2007-04-13 7:59 ` [PATCH v3] " Johannes Berg
2007-04-12 17:36 ` [PATCH v2] " Dmitry Krivoschekov
2007-04-12 20:51 ` Benjamin Herrenschmidt
2007-04-13 6:54 ` Johannes Berg
2007-04-13 8:04 ` David Brownell
2007-04-13 8:59 ` Johannes Berg
2007-04-13 9:07 ` Benjamin Herrenschmidt
2007-04-13 11:47 ` Rafael J. Wysocki
2007-04-13 12:58 ` Johannes Berg
2007-04-13 13:26 ` [PATCH v4] " Johannes Berg
2007-04-13 20:43 ` Rafael J. Wysocki
2007-04-13 20:58 ` Pavel Machek
2007-04-13 21:06 ` Johannes Berg
2007-04-13 21:12 ` Pavel Machek
2007-04-13 21:18 ` Johannes Berg
2007-04-13 21:33 ` Pavel Machek
2007-04-13 21:45 ` Johannes Berg
2007-04-13 21:52 ` Pavel Machek
2007-04-13 21:59 ` Johannes Berg
2007-04-13 22:18 ` Rafael J. Wysocki
2007-04-13 22:20 ` Johannes Berg
2007-04-13 22:49 ` Rafael J. Wysocki
2007-04-13 22:55 ` Johannes Berg
2007-04-13 22:09 ` Rafael J. Wysocki
2007-04-13 22:13 ` Johannes Berg
2007-04-13 22:16 ` Pavel Machek
2007-04-14 16:55 ` Paul Mackerras [this message]
2007-04-13 22:25 ` Benjamin Herrenschmidt
2007-04-13 22:39 ` Pavel Machek
2007-04-13 23:19 ` Benjamin Herrenschmidt
2007-04-14 9:14 ` Rafael J. Wysocki
2007-04-14 9:19 ` Johannes Berg
2007-04-15 0:19 ` Benjamin Herrenschmidt
2007-04-16 7:32 ` Pavel Machek
2007-04-16 8:37 ` Johannes Berg
2007-04-16 12:47 ` Pavel Machek
2007-04-17 4:58 ` Paul Mackerras
2007-04-18 7:50 ` Benjamin Herrenschmidt
2007-04-13 22:47 ` Rafael J. Wysocki
2007-04-13 21:18 ` Benjamin Herrenschmidt
2007-04-13 21:56 ` Pavel Machek
2007-04-13 22:01 ` Johannes Berg
2007-04-13 22:24 ` Benjamin Herrenschmidt
2007-04-13 21:15 ` Benjamin Herrenschmidt
2007-04-13 21:50 ` Pavel Machek
2007-04-13 22:23 ` Benjamin Herrenschmidt
2007-04-14 22:10 ` David Brownell
2007-04-13 21:05 ` [PATCH v2] " Pavel Machek
2007-04-12 8:44 ` Benjamin Herrenschmidt
2007-04-17 17:18 ` [PATCH] s2ram: add arch irq disable/enable hooks Johannes Berg
2007-04-18 11:27 ` Pavel Machek
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