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| author | Alexandre Belloni <alexandre.belloni@bootlin.com> | 2018-02-25 04:55:58 +0300 |
|---|---|---|
| committer | Thierry Reding <thierry.reding@gmail.com> | 2018-03-28 02:07:57 +0300 |
| commit | 989ae7a5b2f965dc5e6de132f1d8c0ea8c23c3c5 (patch) | |
| tree | 6021a938ed865b1f2008a78d0cd7c6347bb94b92 /drivers/pwm/pwm-sun4i.c | |
| parent | 120cc2fff40096fb99d96d8671ad7469dd44862f (diff) | |
| download | linux-989ae7a5b2f965dc5e6de132f1d8c0ea8c23c3c5.tar.xz | |
pwm: sun4i: Properly check current state
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: 93e0dfb2c52f ("pwm: sun4i: Improve hardware read out")
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
Signed-off-by: Thierry Reding <thierry.reding@gmail.com>
Diffstat (limited to 'drivers/pwm/pwm-sun4i.c')
| -rw-r--r-- | drivers/pwm/pwm-sun4i.c | 6 |
1 files changed, 4 insertions, 2 deletions
diff --git a/drivers/pwm/pwm-sun4i.c b/drivers/pwm/pwm-sun4i.c index 334199c58f1d..42e6f0873d1c 100644 --- a/drivers/pwm/pwm-sun4i.c +++ b/drivers/pwm/pwm-sun4i.c @@ -117,7 +117,8 @@ static void sun4i_pwm_get_state(struct pwm_chip *chip, 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; else prescaler = prescaler_table[PWM_REG_PRESCAL(val, pwm->hwpwm)]; @@ -130,7 +131,8 @@ static void sun4i_pwm_get_state(struct pwm_chip *chip, else 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; else state->enabled = false; |