From: Heiner Kallweit <hkallweit1@xxxxxxxxx>
commit 6b9352f3f8a1a35faf0efc1ad1807ee303467796 upstream.
I don't see a reason why we should treat the case lo < hi differently
and return 0 as period and duty_cycle. The current logic was added with
c375bcbaabdb ("pwm: meson: Read the full hardware state in
meson_pwm_get_state()"), Martin as original author doesn't remember why
it was implemented this way back then.
So let's handle it as normal use case and also remove the optimization
for lo == 0. I think the improved readability is worth it.
Fixes: c375bcbaabdb ("pwm: meson: Read the full hardware state in meson_pwm_get_state()")
Reviewed-by: Uwe Kleine-König <u.kleine-koenig@xxxxxxxxxxxxxx>
Reviewed-by: Dmitry Rokosov <ddrokosov@xxxxxxxxxxxxxx>
Acked-by: Martin Blumenstingl <martin.blumenstingl@xxxxxxxxxxxxxx>
Cc: stable@xxxxxxxxxxxxxxx
Signed-off-by: Heiner Kallweit <hkallweit1@xxxxxxxxx>
Signed-off-by: Thierry Reding <thierry.reding@xxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/pwm/pwm-meson.c | 14 ++------------
1 file changed, 2 insertions(+), 12 deletions(-)
--- a/drivers/pwm/pwm-meson.c
+++ b/drivers/pwm/pwm-meson.c
@@ -351,18 +351,8 @@ static int meson_pwm_get_state(struct pw
channel->lo = FIELD_GET(PWM_LOW_MASK, value);
channel->hi = FIELD_GET(PWM_HIGH_MASK, value);
- if (channel->lo == 0) {
- state->period = meson_pwm_cnt_to_ns(chip, pwm, channel->hi);
- state->duty_cycle = state->period;
- } else if (channel->lo >= channel->hi) {
- state->period = meson_pwm_cnt_to_ns(chip, pwm,
- channel->lo + channel->hi);
- state->duty_cycle = meson_pwm_cnt_to_ns(chip, pwm,
- channel->hi);
- } else {
- state->period = 0;
- state->duty_cycle = 0;
- }
+ state->period = meson_pwm_cnt_to_ns(chip, pwm, channel->lo + channel->hi);
+ state->duty_cycle = meson_pwm_cnt_to_ns(chip, pwm, channel->hi);
state->polarity = PWM_POLARITY_NORMAL;
