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pwm: sun4i: Properly check current state

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Correctly extract the prescaler value from CTRL_REG before comparing it
to PWM_PRESCAL_MASK.

Also, check that both PWM_CLK_GATING and PWM_EN to ensure the PWM is
enabled instead of relying on only one of those.

Fixes: 93e0dfb2c5 ("pwm: sun4i: Improve hardware read out")
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
Signed-off-by: Thierry Reding <thierry.reding@gmail.com>
This commit is contained in:
Alexandre Belloni 2018-02-25 02:55:58 +01:00 committed by Thierry Reding
parent 120cc2fff4
commit 989ae7a5b2
1 changed files with 4 additions and 2 deletions
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6
drivers/pwm/pwm-sun4i.c
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@ -117,7 +117,8 @@ static void sun4i_pwm_get_state(struct pwm_chip *chip,
val = sun4i_pwm_readl(sun4i_pwm, PWM_CTRL_REG); val = sun4i_pwm_readl(sun4i_pwm, PWM_CTRL_REG);
if ((val == PWM_PRESCAL_MASK) && sun4i_pwm->data->has_prescaler_bypass) if ((PWM_REG_PRESCAL(val, pwm->hwpwm) == PWM_PRESCAL_MASK) &&
sun4i_pwm->data->has_prescaler_bypass)
prescaler = 1; prescaler = 1;
else else
prescaler = prescaler_table[PWM_REG_PRESCAL(val, pwm->hwpwm)]; prescaler = prescaler_table[PWM_REG_PRESCAL(val, pwm->hwpwm)];
@ -130,7 +131,8 @@ static void sun4i_pwm_get_state(struct pwm_chip *chip,
else else
state->polarity = PWM_POLARITY_INVERSED; state->polarity = PWM_POLARITY_INVERSED;
if (val & BIT_CH(PWM_CLK_GATING | PWM_EN, pwm->hwpwm)) if ((val & BIT_CH(PWM_CLK_GATING | PWM_EN, pwm->hwpwm)) ==
BIT_CH(PWM_CLK_GATING | PWM_EN, pwm->hwpwm))
state->enabled = true; state->enabled = true;
else else
state->enabled = false; state->enabled = false;