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Subject[PATCH v9 11/27] pwm: jz4740: Apply configuration atomically
Date
This is cleaner, more future-proof, and incidentally it also fixes the
PWM resetting its config when stopped/started several times.

Signed-off-by: Paul Cercueil <paul@crapouillou.net>
---

Notes:
v9: New patch

drivers/pwm/pwm-jz4740.c | 37 ++++++++++++-------------------------
1 file changed, 12 insertions(+), 25 deletions(-)

diff --git a/drivers/pwm/pwm-jz4740.c b/drivers/pwm/pwm-jz4740.c
index a7b134af5e04..b2f910413f81 100644
--- a/drivers/pwm/pwm-jz4740.c
+++ b/drivers/pwm/pwm-jz4740.c
@@ -83,17 +83,16 @@ static void jz4740_pwm_disable(struct pwm_chip *chip, struct pwm_device *pwm)
jz4740_timer_disable(pwm->hwpwm);
}

-static int jz4740_pwm_config(struct pwm_chip *chip, struct pwm_device *pwm,
- int duty_ns, int period_ns)
+static int jz4740_pwm_apply(struct pwm_chip *chip, struct pwm_device *pwm,
+ struct pwm_state *state)
{
struct jz4740_pwm_chip *jz4740 = to_jz4740(pwm->chip);
unsigned long long tmp;
unsigned long period, duty;
unsigned int prescaler = 0;
uint16_t ctrl;
- bool is_enabled;

- tmp = (unsigned long long)clk_get_rate(jz4740->clk) * period_ns;
+ tmp = (unsigned long long)clk_get_rate(jz4740->clk) * state->period;
do_div(tmp, 1000000000);
period = tmp;

@@ -105,16 +104,14 @@ static int jz4740_pwm_config(struct pwm_chip *chip, struct pwm_device *pwm,
if (prescaler == 6)
return -EINVAL;

- tmp = (unsigned long long)period * duty_ns;
- do_div(tmp, period_ns);
+ tmp = (unsigned long long)period * state->duty_cycle;
+ do_div(tmp, state->period);
duty = period - tmp;

if (duty >= period)
duty = period - 1;

- is_enabled = jz4740_timer_is_enabled(pwm->hwpwm);
- if (is_enabled)
- jz4740_pwm_disable(chip, pwm);
+ jz4740_pwm_disable(chip, pwm);

jz4740_timer_set_count(pwm->hwpwm, 0);
jz4740_timer_set_duty(pwm->hwpwm, duty);
@@ -125,18 +122,7 @@ static int jz4740_pwm_config(struct pwm_chip *chip, struct pwm_device *pwm,

jz4740_timer_set_ctrl(pwm->hwpwm, ctrl);

- if (is_enabled)
- jz4740_pwm_enable(chip, pwm);
-
- return 0;
-}
-
-static int jz4740_pwm_set_polarity(struct pwm_chip *chip,
- struct pwm_device *pwm, enum pwm_polarity polarity)
-{
- uint32_t ctrl = jz4740_timer_get_ctrl(pwm->pwm);
-
- switch (polarity) {
+ switch (state->polarity) {
case PWM_POLARITY_NORMAL:
ctrl &= ~JZ_TIMER_CTRL_PWM_ACTIVE_LOW;
break;
@@ -146,16 +132,17 @@ static int jz4740_pwm_set_polarity(struct pwm_chip *chip,
}

jz4740_timer_set_ctrl(pwm->hwpwm, ctrl);
+
+ if (state->enabled)
+ jz4740_pwm_enable(chip, pwm);
+
return 0;
}

static const struct pwm_ops jz4740_pwm_ops = {
.request = jz4740_pwm_request,
.free = jz4740_pwm_free,
- .config = jz4740_pwm_config,
- .set_polarity = jz4740_pwm_set_polarity,
- .enable = jz4740_pwm_enable,
- .disable = jz4740_pwm_disable,
+ .apply = jz4740_pwm_apply,
.owner = THIS_MODULE,
};

--
2.11.0
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