Messages in this thread Patch in this message | | | From | Nylon Chen <> | Subject | [PATCH 2/2] pwm: sifive: change the PWM controlled LED algorithm | Date | Fri, 13 Jan 2023 16:31:15 +0800 |
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The `frac` variable represents the pulse inactive time, and the result of this algorithm is the pulse active time. Therefore, we must reverse the result.
Signed-off-by: Nylon Chen <nylon.chen@sifive.com> Reviewed-by: Vincent Chen <vincent.chen@sifive.com> --- drivers/pwm/pwm-sifive.c | 1 + 1 file changed, 1 insertion(+)
diff --git a/drivers/pwm/pwm-sifive.c b/drivers/pwm/pwm-sifive.c index 62b6acc6373d..a5eda165d071 100644 --- a/drivers/pwm/pwm-sifive.c +++ b/drivers/pwm/pwm-sifive.c @@ -158,6 +158,7 @@ static int pwm_sifive_apply(struct pwm_chip *chip, struct pwm_device *pwm, frac = DIV64_U64_ROUND_CLOSEST(num, state->period); /* The hardware cannot generate a 100% duty cycle */ frac = min(frac, (1U << PWM_SIFIVE_CMPWIDTH) - 1); + frac = (1U << PWM_SIFIVE_CMPWIDTH) - 1 - frac; mutex_lock(&ddata->lock); if (state->period != ddata->approx_period) { -- 2.36.1
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