pwm: atmel: Fix polarity handling

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When atmel_pwm_config() calculates and then sets the prescaler, it is
overwriting the channel's CMR register so we are losing the CPOL
configuration.

As atmel_pwm_config() is always called before enabling a channel,
inverting the polarity doesn't work.

Fix that by reading CMR first and only overwriting the prescaler bits.

Signed-off-by: Alexandre Belloni <alexandre.belloni@free-electrons.com>
Acked-by: Nicolas Ferre <nicolas.ferre@atmel.com>
Signed-off-by: Thierry Reding <thierry.reding@gmail.com>

...

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Alexandre Belloni 2014-03-14 15:19:08 +01:00 • committed by Thierry Reding

parent 42586315b7

commit 8db9e29fe5

1 changed files with 6 additions and 1 deletions

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drivers/pwm/pwm-atmel.c

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