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| author | Wai-Hong Tam <waihong@google.com> | 2020-07-29 12:09:55 -0700 |
|---|---|---|
| committer | Commit Bot <commit-bot@chromium.org> | 2020-07-30 04:42:14 +0000 |
| commit | 8ff1717409b98f75f1b6b613e4b0fd1e1400a416 (patch) | |
| tree | 26d065cda94a44727570cb449e0fce1fe9685c08 /power | |
| parent | 1cef85d675613e6cf18a5408675cc33085586d8b (diff) | |
| download | chrome-ec-8ff1717409b98f75f1b6b613e4b0fd1e1400a416.tar.gz | |
sc7180: Enable the load switch during AP power-on
The QSIP_ON GPIO controls the load switch enable. The load switch is
redundant and used for experiments. But leaving it off consumes power.
Should enable it during AP power-on and disable it during AP power-off,
such that it doesn't waste power.
Add the QSIP_ON GPIO to the trogdor board. It was added since rev-1
(rev-0 is NC).
BRANCH=None
BUG=b:159999589
TEST=Checked AP power-on and power-off.
Change-Id: Ia1ef6a0c2285b5adcc53b717f7f310b15eb1d941
Signed-off-by: Wai-Hong Tam <waihong@google.com>
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/ec/+/2327632
Reviewed-by: Matthias Kaehlcke <mka@chromium.org>
Reviewed-by: Jim Guerin <jguerin@google.com>
Diffstat (limited to 'power')
| -rw-r--r-- | power/sc7180.c | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/power/sc7180.c b/power/sc7180.c index 886f22078b..d31728bfc7 100644 --- a/power/sc7180.c +++ b/power/sc7180.c @@ -514,6 +514,9 @@ static void power_off(void) set_system_power(0); } + /* Turn off the load switch */ + gpio_set_level(GPIO_QSIP_ON, 0); + /* Turn off the 3.3V and 5V rails. */ gpio_set_level(GPIO_EN_PP3300_A, 0); #ifdef CONFIG_POWER_PP5000_CONTROL @@ -565,6 +568,12 @@ static int power_on(void) gpio_set_level(GPIO_EN_PP5000, 1); #endif /* defined(CONFIG_POWER_PP5000_CONTROL) */ + /* + * Enable the load switch. The load switch is redundant. + * But leaving it off consumes power. + */ + gpio_set_level(GPIO_QSIP_ON, 1); + ret = set_system_power(1); if (ret != EC_SUCCESS) return ret; |