From: linux@arm.linux.org.uk (Russell King - ARM Linux)
To: linux-arm-kernel@lists.infradead.org
Subject: [PATCH 2/6] ARM: pm: add generic CPU suspend/resume support
Date: Tue, 15 Feb 2011 10:50:50 +0000 [thread overview]
Message-ID: <20110215105050.GA11199@n2100.arm.linux.org.uk> (raw)
In-Reply-To: <AANLkTi=JF1c-aFHpSZ-XECLEPSMsFihXT+w3=NXdYn8L@mail.gmail.com>
On Mon, Feb 14, 2011 at 08:11:23PM -0800, Colin Cross wrote:
> Even with a cache flush, cpu_resume_turn_on_mmu fails because the page
> table modification, done with the cache off, ends up in memory, but
> the L2 contains the old value. When the MMU and cache are enabled,
> the 1:1 mapping disappears. The page table would need to be
> invalidated during suspend.
>
> I can avoid the problem entirely by leaving the MMU on and skipping
> cpu_resume when the CPU does not go through reset.
If you're not losing CPU state, what's the point in calling the suspend
function? It's purpose is to save CPU state ready for the CPU going to
sleep and losing power, and restoring that state when the CPU wakes up
sometime later.
next prev parent reply other threads:[~2011-02-15 10:50 UTC|newest]
Thread overview: 34+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-02-11 16:16 [PATCH] Generic CPU save/restore PM support Russell King - ARM Linux
2011-02-11 16:17 ` [PATCH 1/6] ARM: move cache/processor/fault glue to separate include files Russell King - ARM Linux
2011-02-12 2:52 ` Colin Cross
2011-02-12 9:48 ` Russell King - ARM Linux
2011-02-11 16:17 ` [PATCH 2/6] ARM: pm: add generic CPU suspend/resume support Russell King - ARM Linux
2011-02-12 2:50 ` Colin Cross
2011-02-15 11:04 ` Russell King - ARM Linux
2011-02-16 0:26 ` Colin Cross
2011-02-17 10:41 ` Lorenzo Pieralisi
2011-02-17 13:59 ` Russell King - ARM Linux
2011-02-17 20:05 ` Colin Cross
2011-02-17 23:36 ` Russell King - ARM Linux
2011-02-20 12:00 ` Russell King - ARM Linux
2011-02-21 9:58 ` Kukjin Kim
2011-02-15 1:21 ` Colin Cross
2011-02-15 4:11 ` Colin Cross
2011-02-15 10:50 ` Russell King - ARM Linux [this message]
2011-02-15 18:20 ` Colin Cross
2011-02-11 16:18 ` [PATCH 3/6] ARM: pm: convert PXA to generic " Russell King - ARM Linux
2011-02-11 16:18 ` [PATCH 4/6] ARM: pm: convert sa11x0 " Russell King - ARM Linux
2011-02-11 16:18 ` [PATCH 5/6] ARM: pm: convert samsung platforms " Russell King - ARM Linux
2011-02-17 12:09 ` Kukjin Kim
2011-02-17 14:06 ` Russell King - ARM Linux
2011-02-17 23:05 ` Kukjin Kim
2011-02-17 23:29 ` Russell King - ARM Linux
2011-02-17 23:46 ` Kukjin Kim
2011-02-17 23:58 ` SAMSUNG: any example code for soc_camera, tv output, etc...? Nick Pelling
2011-02-22 14:00 ` 余谨智
[not found] ` <AANLkTin0PR3VQLruade+w6GbCMoW9pXy4Kvn-sBZ+LBM@mail.gmail.c om>
2011-02-22 22:54 ` Nick Pelling
2011-02-23 11:03 ` Sylwester Nawrocki
2011-02-11 16:19 ` [PATCH 6/6] ARM: pm: allow generic sleep code to be used with SMP CPU idle Russell King - ARM Linux
2011-02-12 2:52 ` Colin Cross
2011-02-13 21:59 ` Colin Cross
2011-02-14 16:01 ` Russell King - ARM Linux
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