[U-Boot] [PATCH 4/4] rockchip: pwm: add mask for config setting

[Kever Yang]

Use mask to clear old setting before direct set the new config,
or else there it will mess up the config when it's not the same
with default value.
Fixs: 3851059 rockchip: Setup default PWM flags

Signed-off-by: Kever Yang <kever.yang at rock-chips.com>
---

 arch/arm/include/asm/arch-rockchip/pwm.h | 2 ++
 drivers/pwm/rk_pwm.c                     | 1 +
 2 files changed, 3 insertions(+)

diff --git a/arch/arm/include/asm/arch-rockchip/pwm.h b/arch/arm/include/asm/arch-rockchip/pwm.h
index 08ff945..b1d8047 100644
--- a/arch/arm/include/asm/arch-rockchip/pwm.h
+++ b/arch/arm/include/asm/arch-rockchip/pwm.h
@@ -25,9 +25,11 @@ check_member(rk3288_pwm, ctrl, 0xc);
 
 #define PWM_DUTY_POSTIVE                (1 << 3)
 #define PWM_DUTY_NEGATIVE               (0 << 3)
+#define PWM_DUTY_MASK			(1 << 3)
 
 #define PWM_INACTIVE_POSTIVE            (1 << 4)
 #define PWM_INACTIVE_NEGATIVE           (0 << 4)
+#define PWM_INACTIVE_MASK		(1 << 4)
 
 #define PWM_OUTPUT_LEFT                 (0 << 5)
 #define PWM_OUTPUT_CENTER               (1 << 5)
diff --git a/drivers/pwm/rk_pwm.c b/drivers/pwm/rk_pwm.c
index 28de62d..2364c2d 100644
--- a/drivers/pwm/rk_pwm.c
+++ b/drivers/pwm/rk_pwm.c
@@ -29,6 +29,7 @@ static int rk_pwm_set_invert(struct udevice *dev, uint channel, bool polarity)
 	struct rk_pwm_priv *priv = dev_get_priv(dev);
 
 	debug("%s: polarity=%u\n", __func__, polarity);
+	priv->enable_conf &= ~(PWM_DUTY_MASK | PWM_INACTIVE_MASK);
 	if (polarity)
 		priv->enable_conf |= PWM_DUTY_NEGATIVE | PWM_INACTIVE_POSTIVE;
 	else
-- 
1.9.1