diff options
| author |   Uwe Kleine-König <uwe@kleine-koenig.org> | 2019-08-24 17:37:03 +0200 |
|---|---|---|
| committer |   Thierry Reding <thierry.reding@gmail.com> | 2019-09-21 01:48:54 +0200 |
| commit | 01ccf903edd65f6421612321648fa5a7f4b7cb10 (patch) | |
| tree | 7f91aa81ecbdb830970221e6b4b1743d4b594792 /drivers/pwm | |
| parent | pwm: Introduce local struct pwm_chip in pwm_apply_state() (diff) | |
| download | linux-dev-01ccf903edd65f6421612321648fa5a7f4b7cb10.tar.xz linux-dev-01ccf903edd65f6421612321648fa5a7f4b7cb10.zip | |
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>
Diffstat (limited to 'drivers/pwm')
| -rw-r--r-- | drivers/pwm/core.c | 9 |
1 files changed, 8 insertions, 1 deletions
diff --git a/drivers/pwm/core.c b/drivers/pwm/core.c index 4ab683a30629..449ba161877d 100644 --- a/drivers/pwm/core.c +++ b/drivers/pwm/core.c @@ -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. |