pwm: sprd: Ensure configuring period and duty_cycle isn't wrongly skipped

As the last call to sprd_pwm_apply() might have exited early if
state->enabled was false, the values for period and duty_cycle stored in
pwm->state might not have been written to hardware and it must be
ensured that they are configured before enabling the PWM.

Fixes: 8aae4b02e8a6 ("pwm: sprd: Add Spreadtrum PWM support")
Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Signed-off-by: Thierry Reding <thierry.reding@gmail.com>

diff --git a/drivers/pwm/pwm-sprd.c b/drivers/pwm/pwm-sprd.c
index f2a85e8..7004f55 100644 (file)
--- a/drivers/pwm/pwm-sprd.c
+++ b/drivers/pwm/pwm-sprd.c
@@ -183,13 +183,10 @@ static int sprd_pwm_apply(struct pwm_chip *chip, struct pwm_device *pwm,
                        }
                }
 
-               if (state->period != cstate->period ||
-                   state->duty_cycle != cstate->duty_cycle) {
-                       ret = sprd_pwm_config(spc, pwm, state->duty_cycle,
-                                             state->period);
-                       if (ret)
-                               return ret;
-               }
+               ret = sprd_pwm_config(spc, pwm, state->duty_cycle,
+                                     state->period);
+               if (ret)
+                       return ret;
 
                sprd_pwm_write(spc, pwm->hwpwm, SPRD_PWM_ENABLE, 1);
        } else if (cstate->enabled) {