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ebe3caeb69
In order to prevent keeping the CSAE bit at 1 forever impacts the eSPI
performance, the npcx driver enables host access wakeup functionality
before ec enters deep sleep or wfi. But this bypass also should be added
in __idle() of core/cortex-m/task.c if CONFIG_LOW_POWER_IDLE is
disabled.
This CL also narrows the bypass only when host interface is eSPI.
BRANCH=eve
BUG=b:64730183
TEST=No build errors for make buildall. Disable CONFIG_LOW_POWER_IDLE
functionality on poppy and use following script "count=0; while :;
do echo "--- iteration --- $count"; time flashrom -p ec -r ec.bin; sleep
1; count=$((${count}+1)); done" to test eSPI performances over 300
times. No errors occur and all tests' efficiency are the same as
removing CSAE bypass.
Change-Id: I8b6b69e37318208c185747151c06b3e6bdfd2f4e
Signed-off-by: Mulin Chao <mlchao@nuvoton.com>
Reviewed-on: https://chromium-review.googlesource.com/644967
Reviewed-by: Daisuke Nojiri <dnojiri@chromium.org>
For an overview of the Embedded Controller firmware, refer to http://www.chromium.org/chromium-os/2014-firmware-summit For instructions on building from source, refer to http://www.chromium.org/chromium-os/ec-development/getting-started-building-ec-images-quickly