The pwm_set_polarity() function finally calls pwm_apply_state(), which in turn requires state->duty_cycle and state->period properly set.
In the moment when polarity is set, the PWM is disabled and not configured. For that reason both above variables are set to 0 and the polarity is not set. To be sure that polarity is setup, one needs to set pwm->args.polarity, which controls MX3_PWMCR_POUTC bit setting at imx_pwm_config_v2(). Signed-off-by: Lukasz Majewski <l.majew...@majess.pl> --- This patch should be applied on top of: "[v2,2/6] pwm: core: make the PWM_POLARITY flag in DTB optional" http://patchwork.ozlabs.org/patch/677330/ --- drivers/pwm/core.c | 8 +++----- 1 file changed, 3 insertions(+), 5 deletions(-) diff --git a/drivers/pwm/core.c b/drivers/pwm/core.c index 1f62668..6cd6004 100644 --- a/drivers/pwm/core.c +++ b/drivers/pwm/core.c @@ -153,13 +153,11 @@ of_pwm_xlate_with_flags(struct pwm_chip *pc, const struct of_phandle_args *args) return pwm; pwm->args.period = args->args[1]; + pwm->args.polarity = PWM_POLARITY_NORMAL; - if (args->args_count > 2) { + if (args->args_count > 2) if (args->args[2] & PWM_POLARITY_INVERTED) - pwm_set_polarity(pwm, PWM_POLARITY_INVERSED); - else - pwm_set_polarity(pwm, PWM_POLARITY_NORMAL); - } + pwm->args.polarity = PWM_POLARITY_INVERSED; return pwm; } -- 2.1.4
