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-rw-r--r--drivers/pwm/pwm-lpss-platform.c25
-rw-r--r--drivers/pwm/pwm-lpss.h2
2 files changed, 24 insertions, 3 deletions
diff --git a/drivers/pwm/pwm-lpss-platform.c b/drivers/pwm/pwm-lpss-platform.c
index 7304f36..b6edf8a 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 8f029ed..1a2575d 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,

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