diff options
Diffstat (limited to 'drivers/pwm')
| -rw-r--r-- | drivers/pwm/pwm-lpss-platform.c | 25 | ||||
| -rw-r--r-- | drivers/pwm/pwm-lpss.h | 2 |
2 files changed, 24 insertions, 3 deletions
diff --git a/drivers/pwm/pwm-lpss-platform.c b/drivers/pwm/pwm-lpss-platform.c index 7304f36ee715..b6edf8af26cc 100644 --- a/drivers/pwm/pwm-lpss-platform.c +++ b/drivers/pwm/pwm-lpss-platform.c @@ -30,6 +30,7 @@ static const struct pwm_lpss_boardinfo pwm_lpss_bsw_info = { .clk_rate = 19200000, .npwm = 1, .base_unit_bits = 16, + .check_power_on_resume = true, }; /* Broxton */ @@ -74,9 +75,27 @@ static int pwm_lpss_remove_platform(struct platform_device *pdev) return pwm_lpss_remove(lpwm); } -static SIMPLE_DEV_PM_OPS(pwm_lpss_platform_pm_ops, - pwm_lpss_suspend, - pwm_lpss_resume); +static void pwm_lpss_complete(struct device *dev) +{ + struct pwm_lpss_chip *lpwm = dev_get_drvdata(dev); + int ret, state; + + /* The PWM may be turned on by AML code, update our state to match */ + if (pm_runtime_suspended(dev) && lpwm->info->check_power_on_resume) { + pm_runtime_disable(dev); + + ret = acpi_device_get_power(ACPI_COMPANION(dev), &state); + if (ret == 0 && state == ACPI_STATE_D0) + pm_runtime_set_active(dev); + + pm_runtime_enable(dev); + } +} + +static const struct dev_pm_ops pwm_lpss_platform_pm_ops = { + .complete = pwm_lpss_complete, + SET_SYSTEM_SLEEP_PM_OPS(pwm_lpss_suspend, pwm_lpss_resume) +}; static const struct acpi_device_id pwm_lpss_acpi_match[] = { { "80860F09", (unsigned long)&pwm_lpss_byt_info }, diff --git a/drivers/pwm/pwm-lpss.h b/drivers/pwm/pwm-lpss.h index 8f029ed263af..1a2575d25bea 100644 --- a/drivers/pwm/pwm-lpss.h +++ b/drivers/pwm/pwm-lpss.h @@ -30,6 +30,8 @@ struct pwm_lpss_boardinfo { unsigned int npwm; unsigned long base_unit_bits; bool bypass; + /* Some devices have AML code messing with the state underneath us */ + bool check_power_on_resume; }; struct pwm_lpss_chip *pwm_lpss_probe(struct device *dev, struct resource *r, |