From: Mika Westerberg <mika.westerb...@linux.intel.com>
The LPSS PWM driver calls pwm_lpss_disable() when the PWM device is
released (for example unexported from sysfs). This in turn calls
pm_runtime_put() which makes runtime PM count to be unbalanced if the
device has not been enabled at this point.
This is easy to reproduce:
# cd /sys/class/pwm/pwmchip0
# echo 0 > export
# echo 0 > unexport
The count is unbalanced and prevents the PWM device from being powered on
next time.
Fix this by removing ->free() callback. There are no resources to be
released anyway.
Signed-off-by: Mika Westerberg <mika.westerb...@linux.intel.com>
Signed-off-by: Thierry Reding <thierry.red...@gmail.com>
(cherry picked from commit c7b91b33cf446ec09eedf4594cff8d7b85ef6870)
Signed-off-by: Tan Jui Nee <jui.nee....@intel.com>
---
drivers/pwm/pwm-lpss.c | 1 -
1 file changed, 1 deletion(-)
diff --git a/drivers/pwm/pwm-lpss.c b/drivers/pwm/pwm-lpss.c
index 2504410..3f61c50 100644
--- a/drivers/pwm/pwm-lpss.c
+++ b/drivers/pwm/pwm-lpss.c
@@ -135,7 +135,6 @@ static void pwm_lpss_disable(struct pwm_chip *chip, struct
pwm_device *pwm)
}
static const struct pwm_ops pwm_lpss_ops = {
- .free = pwm_lpss_disable,
.config = pwm_lpss_config,
.enable = pwm_lpss_enable,
.disable = pwm_lpss_disable,
--
1.9.1
--
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