>From the datasheet, the actual duty cycle is:
(period - (1/clk) * CDTY)/period
This actually correct the polarity of the PWM and solves the issue that pwm-leds
exhibits: when setting a duty cycle of 0 and then disabling a channel, the level
was wrong (1 when the polarity was normal and 0 when the polarity was inversed).
Signed-off-by: Alexandre Belloni <alexandre.bell...@free-electrons.com>
---
drivers/pwm/pwm-atmel.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/pwm/pwm-atmel.c b/drivers/pwm/pwm-atmel.c
index 2d69e9c431dd..0adc952cc4ef 100644
--- a/drivers/pwm/pwm-atmel.c
+++ b/drivers/pwm/pwm-atmel.c
@@ -133,7 +133,7 @@ static int atmel_pwm_config(struct pwm_chip *chip, struct
pwm_device *pwm,
prd = div;
div *= duty_ns;
do_div(div, period_ns);
- dty = div;
+ dty = prd - div;
ret = clk_enable(atmel_pwm->clk);
if (ret) {
--
1.8.3.2
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majord...@vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/
