diff options
| author | Shawn Nematbakhsh <shawnn@chromium.org> | 2016-04-27 13:54:52 -0700 |
|---|---|---|
| committer | chrome-bot <chrome-bot@chromium.org> | 2016-04-27 23:58:04 -0700 |
| commit | ab27f42f5636af5fba50a871e391018cb1c885bf (patch) | |
| tree | b3c6e464b0b8e5a44b61c6e814220ef4293b0c92 /chip/npcx/pwm.c | |
| parent | 8d742588ade84d45ce6fe7ca069d6087fac6928c (diff) | |
| download | chrome-ec-ab27f42f5636af5fba50a871e391018cb1c885bf.tar.gz | |
pwm: Add PWM_CONFIG_DSLEEP config flag
Add PWM_CONFIG_DSLEEP PWM config flag, which can be set to keep a
channel active during low-power idle / deep sleep. Currently it's
supported by npcx and mec1322.
BUG=chrome-os-partner:52783
BRANCH=glados
TEST=Manual on chell w/ subsequent commit + CONFIG_LOW_POWER_S0. Verify
KB backlight does not flicker during idle.
Change-Id: Ib9df5879aaa7dfa5764de1583496de84d40d2bb5
Signed-off-by: Shawn Nematbakhsh <shawnn@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/341002
Commit-Ready: Shawn N <shawnn@chromium.org>
Tested-by: Shawn N <shawnn@chromium.org>
Reviewed-by: Vincent Palatin <vpalatin@chromium.org>
Reviewed-by: Todd Broch <tbroch@chromium.org>
Diffstat (limited to 'chip/npcx/pwm.c')
| -rw-r--r-- | chip/npcx/pwm.c | 10 |
1 files changed, 7 insertions, 3 deletions
diff --git a/chip/npcx/pwm.c b/chip/npcx/pwm.c index 7d3a548382..e99ed039c2 100644 --- a/chip/npcx/pwm.c +++ b/chip/npcx/pwm.c @@ -63,8 +63,12 @@ void pwm_set_freq(enum pwm_channel ch, uint32_t freq, uint32_t res) /* Disable PWM for module configuration */ pwm_enable(ch, 0); - /* Get PWM clock frequency */ - if (pwm_channels[ch].flags & PWM_CONFIG_DSLEEP_CLK) + /* + * Get PWM clock frequency. Use internal 32K as PWM clock source if + * the PWM must be active during low-power idle. + */ + + if (pwm_channels[ch].flags & PWM_CONFIG_DSLEEP) clock = INT_32K_CLOCK; else clock = clock_get_apb2_freq(); @@ -205,7 +209,7 @@ void pwm_config(enum pwm_channel ch) /* Select PWM clock source */ UPDATE_BIT(NPCX_PWMCTL(mdl), NPCX_PWMCTL_CKSEL, - (pwm_channels[ch].flags & PWM_CONFIG_DSLEEP_CLK)); + (pwm_channels[ch].flags & PWM_CONFIG_DSLEEP)); /* Set PWM operation frequency */ pwm_set_freq(ch, pwm_channels[ch].freq, DUTY_CYCLE_RESOLUTION); |