pwm: meson: Don't duplicate the polarity internally

Let meson_pwm_calc() use the polarity from struct pwm_state directly.
This removes a level of indirection where meson_pwm_apply() first had to
set a driver-internal inverter mask which was then only used by
meson_pwm_calc().

Instead of adding the polarity as parameter to meson_pwm_calc() switch
to struct pwm_state directly to make it easier to see where the
parameters are actually coming from.

Reviewed-by: Neil Armstrong <narmstrong@baylibre.com>
Signed-off-by: Martin Blumenstingl <martin.blumenstingl@googlemail.com>
Signed-off-by: Thierry Reding <thierry.reding@gmail.com>

drivers/pwm/pwm-meson.c

@@ -63,7 +63,6 @@ struct meson_pwm {
 	struct pwm_chip chip;
 	const struct meson_pwm_data *data;
 	void __iomem *base;
-	u8 inverter_mask;
 	/*
 	 * Protects register (write) access to the REG_MISC_AB register
 	 * that is shared between the two PWMs.
@@ -116,14 +115,17 @@ static void meson_pwm_free(struct pwm_chip *chip, struct pwm_device *pwm)
 }
 
 static int meson_pwm_calc(struct meson_pwm *meson,
-			  struct meson_pwm_channel *channel, unsigned int id,
-			  unsigned int duty, unsigned int period)
+			  struct meson_pwm_channel *channel,
+			  struct pwm_state *state)
 {
-	unsigned int pre_div, cnt, duty_cnt;
+	unsigned int duty, period, pre_div, cnt, duty_cnt;
 	unsigned long fin_freq = -1;
 	u64 fin_ps;
 
-	if (~(meson->inverter_mask >> id) & 0x1)
+	duty = state->duty_cycle;
+	period = state->period;
+
+	if (state->polarity == PWM_POLARITY_INVERSED)
 		duty = period - duty;
 
 	if (period == channel->state.period &&
@@ -278,15 +280,7 @@ static int meson_pwm_apply(struct pwm_chip *chip, struct pwm_device *pwm,
 	if (state->period != channel->state.period ||
 	    state->duty_cycle != channel->state.duty_cycle ||
 	    state->polarity != channel->state.polarity) {
-		if (state->polarity != channel->state.polarity) {
-			if (state->polarity == PWM_POLARITY_NORMAL)
-				meson->inverter_mask |= BIT(pwm->hwpwm);
-			else
-				meson->inverter_mask &= ~BIT(pwm->hwpwm);
-		}
-
-		err = meson_pwm_calc(meson, channel, pwm->hwpwm,
-				     state->duty_cycle, state->period);
+		err = meson_pwm_calc(meson, channel, state);
 		if (err < 0)
 			return err;
 
@@ -529,7 +523,6 @@ static int meson_pwm_probe(struct platform_device *pdev)
 	meson->chip.of_pwm_n_cells = 3;
 
 	meson->data = of_device_get_match_data(&pdev->dev);
-	meson->inverter_mask = BIT(meson->chip.npwm) - 1;
 
 	channels = devm_kcalloc(&pdev->dev, meson->chip.npwm,
 				sizeof(*channels), GFP_KERNEL);