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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>
This commit is contained in:
Martin Blumenstingl 2019-06-12 21:59:02 +02:00 committed by Thierry Reding
parent 33cefd84d2
commit b79c3670e1
1 changed files with 8 additions and 15 deletions
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23
drivers/pwm/pwm-meson.c
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@ -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);