From: shawn.guo@linaro.org (Shawn Guo)
To: linux-arm-kernel@lists.infradead.org
Subject: L2 cache suspend/resume
Date: Sun, 6 Apr 2014 19:40:35 +0800 [thread overview]
Message-ID: <20140406114033.GC24260@dragon> (raw)
In-Reply-To: <20140405112700.GJ7528@n2100.arm.linux.org.uk>
On Sat, Apr 05, 2014 at 12:27:00PM +0100, Russell King - ARM Linux wrote:
> While looking through the L2 resume code paths, I notice that:
>
> * exynos
> * imx
> * tegra
>
> all resume their L2 caches from assembly code, rather than using
> outer_disable() before cpu_suspend(), and outer_resume() afterwards.
> From what I can see, these are all running in the secure world, so that
> isn't the reason.
>
> What is the reason for this difference? Can these three be converted to
> the outer_disable()...outer_resume() method?
For imx, the L2 power and therefore the memory array is retained in
suspend. We do not want to call outer_disable() to have these data
flushed, and need to restore L2 controller before MMU is enabled.
Shawn
next prev parent reply other threads:[~2014-04-06 11:40 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-04-05 11:27 L2 cache suspend/resume Russell King - ARM Linux
2014-04-06 11:40 ` Shawn Guo [this message]
2014-04-06 11:46 ` Russell King - ARM Linux
2014-04-06 12:19 ` Shawn Guo
2014-04-07 15:35 ` Stephen Warren
2014-04-08 2:46 ` Joseph Lo
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20140406114033.GC24260@dragon \
--to=shawn.guo@linaro.org \
--cc=linux-arm-kernel@lists.infradead.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.