Files
OpenCellular/common
Doug Anderson 3f4899b6b0 stm32l: Add a "PRE_FREQ_CHANGE" hook to allow other code to prepare
Before this change drivers had no way of knowing that a frequency
change was coming.  This could cause problems for some drivers (like
i2c) that need to make sure that a transaction isn't happening while a
frequency change is happening.

The PRE_FREQ_CHANGE archiecture is very simple here and we don't allow
any way to cancel it.

At the moment, we guarantee:
- We won't call PRE_FREQ_CHANGE with interrupts disabled, so acquiring
  locks / sleeping is OK.
- We'll call the actual HOOK_FREQ_CHANGE after the PRE_FREQ_CHANGE.

PRE_FREQ_CHANGE and HOOK_FREQ_CHANGE should not use deferred function
calls.

BRANCH=pit
BUG=chrome-os-partner:22093
TEST=With all patches together:
- on AP: suspend_stress_test
- on EC: battery 10000 50

Change-Id: I2731a3e85d41e749fa571fdb74b5c9b12043cda6
Signed-off-by: Doug Anderson <dianders@chromium.org>
Previous-Reviewed-on: https://chromium-review.googlesource.com/167101
(cherry picked from commit d84c0dbbf7c5a72917a820e292ecfdfa698d0fb9)
Reviewed-on: https://chromium-review.googlesource.com/167148
Reviewed-by: Randall Spangler <rspangler@chromium.org>
2013-08-29 22:51:11 +00:00
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