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| author | Nicolas Boichat <drinkcat@chromium.org> | 2018-08-01 18:07:30 +0800 |
|---|---|---|
| committer | chrome-bot <chrome-bot@chromium.org> | 2018-08-23 13:20:38 -0700 |
| commit | cac3f7c60f5a62ae3c696b02581e750c7dedb2fe (patch) | |
| tree | b424c5ea87a4850b7f6afd959b5bcca2dbda546b /include | |
| parent | 6853d78b821d3e0bdfe39dcde9b031f0eab162fa (diff) | |
| download | chrome-ec-cac3f7c60f5a62ae3c696b02581e750c7dedb2fe.tar.gz | |
kukui/emmc: Disable eMMC emulation when not needed
When AP is off, or after it has booted, disable eMMC emulation,
to save power.
We also add a new sleepmask bit SLEEP_MASK_EMMC to make sure the
EC does not deep sleep when emulating eMMC (timing is very critical).
We only try to emulate for 5 seconds after boot, after which we
shut down the SPI controller. 5 seconds is enough for multiple boot
attempts by the AP.
BRANCH=none
BUG=b:110907438
TEST=Power up kukui, apshutdown, powerb, repeatedly, see that AP
always boots up properly.
TEST=EC power consumption in S5/G3 drops from ~6mW to 0.6mW.
Change-Id: I32cc11418faa695ccf340784acbe7fa99bf74d8c
Signed-off-by: Nicolas Boichat <drinkcat@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/1181009
Commit-Ready: ChromeOS CL Exonerator Bot <chromiumos-cl-exonerator@appspot.gserviceaccount.com>
Reviewed-by: Yilun Lin <yllin@chromium.org>
Diffstat (limited to 'include')
| -rw-r--r-- | include/system.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/include/system.h b/include/system.h index bce8689503..c040bca840 100644 --- a/include/system.h +++ b/include/system.h @@ -431,6 +431,7 @@ enum { * detection ongoing */ SLEEP_MASK_PLL = (1 << 12), /* High-speed PLL in-use */ SLEEP_MASK_ADC = (1 << 13), /* ADC conversion ongoing */ + SLEEP_MASK_EMMC = (1 << 14), /* eMMC emulation ongoing */ SLEEP_MASK_FORCE_NO_DSLEEP = (1 << 15), /* Force disable. */ |