diff options
Diffstat (limited to 'drivers/pwm/pwm-meson.c')
| -rw-r--r-- | drivers/pwm/pwm-meson.c | 23 |
1 files changed, 22 insertions, 1 deletions
diff --git a/drivers/pwm/pwm-meson.c b/drivers/pwm/pwm-meson.c index 70a8ca3409b7..f934828aaff9 100644 --- a/drivers/pwm/pwm-meson.c +++ b/drivers/pwm/pwm-meson.c @@ -245,6 +245,7 @@ static void meson_pwm_disable(struct meson_pwm *meson, struct pwm_device *pwm) static int meson_pwm_apply(struct pwm_chip *chip, struct pwm_device *pwm, struct pwm_state *state) { + struct meson_pwm_channel *channel = pwm_get_chip_data(pwm); struct meson_pwm *meson = to_meson_pwm(chip); int err = 0; @@ -252,7 +253,27 @@ static int meson_pwm_apply(struct pwm_chip *chip, struct pwm_device *pwm, return -EINVAL; if (!state->enabled) { - meson_pwm_disable(meson, pwm); + if (state->polarity == PWM_POLARITY_INVERSED) { + /* + * This IP block revision doesn't have an "always high" + * setting which we can use for "inverted disabled". + * Instead we achieve this using the same settings + * that we use a pre_div of 0 (to get the shortest + * possible duration for one "count") and + * "period == duty_cycle". This results in a signal + * which is LOW for one "count", while being HIGH for + * the rest of the (so the signal is HIGH for slightly + * less than 100% of the period, but this is the best + * we can achieve). + */ + channel->pre_div = 0; + channel->hi = ~0; + channel->lo = 0; + + meson_pwm_enable(meson, pwm); + } else { + meson_pwm_disable(meson, pwm); + } } else { err = meson_pwm_calc(meson, pwm, state); if (err < 0) |