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@xxxxxxxxxxxxxxxxx>
---
drivers/pwm/core.c | 9 ++++++++-
1 file changed, 8 insertions(+), 1 deletion(-)
diff --git a/drivers/pwm/core.c b/drivers/pwm/core.c
index 72347ca4a647..92333b89bf02 100644
--- a/drivers/pwm/core.c
+++ b/drivers/pwm/core.c
@@ -473,7 +473,14 @@ 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.
--
2.20.1
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