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pwm: Let pwm_get_state() return the last implemented state 

When pwm_apply_state() is called the lowlevel driver usually has to
apply some rounding because the hardware doesn't support nanosecond
resolution. So let pwm_get_state() return the actually implemented state
instead of the last applied one if possible.

Signed-off-by: Uwe Kleine-König <uwe@kleine-koenig.org>
Signed-off-by: Thierry Reding <thierry.reding@gmail.com>
alistair/sunxi64-5.4-dsi
Uwe Kleine-König 2019-08-24 17:37:03 +02:00 committed by Thierry Reding
parent fc3c5512e3
commit 01ccf903ed
1 changed files with 8 additions and 1 deletions
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9
drivers/pwm/core.c
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@ -474,7 +474,14 @@ int pwm_apply_state(struct pwm_device *pwm, struct pwm_state *state)
if (err)
return err;
pwm->state = *state;
/*
* .apply might have to round some values in *state, if possible
* read the actually implemented value back.
*/
if (chip->ops->get_state)
chip->ops->get_state(chip, pwm, &pwm->state);
else
pwm->state = *state;
} else {
/*
* FIXME: restore the initial state in case of error.