[PATCH 3/8] pwm: loongson: Fix 32-bit control register truncation in pwm_loongson_set_polarity()

[Lee Jones]

pwm_loongson_set_polarity() stores the 32-bit value read from
LOONGSON_PWM_REG_CTRL into a 16-bit local variable before writing it
back to the register, silently clearing the upper 16 bits.

Change val from u16 to u32 to match the 32-bit register width used
throughout the rest of the driver.

Fixes: 2b62c89448dd ("pwm: Add Loongson PWM controller support")
Closes: https://sashiko.dev/#/bug/linux-bea00bdd-ae27-4d81-9902-e96ed8b6d8ad
Cc: stable@xxxxxxxxxxxxxxx
Signed-off-by: Lee Jones <lee@xxxxxxxxxx>
---
 drivers/pwm/pwm-loongson.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/pwm/pwm-loongson.c b/drivers/pwm/pwm-loongson.c
index 98c809bde2b3..4e8b54c8016c 100644
--- a/drivers/pwm/pwm-loongson.c
+++ b/drivers/pwm/pwm-loongson.c
@@ -76,7 +76,7 @@ static inline void pwm_loongson_writel(struct pwm_loongson_ddata *ddata,
 static int pwm_loongson_set_polarity(struct pwm_chip *chip, struct pwm_device *pwm,
 				     enum pwm_polarity polarity)
 {
-	u16 val;
+	u32 val;
 	struct pwm_loongson_ddata *ddata = to_pwm_loongson_ddata(chip);
 
 	val = pwm_loongson_readl(ddata, LOONGSON_PWM_REG_CTRL);
Cc: Binbin Zhou <zhoubinbin@xxxxxxxxxxx>
-- 
2.56.0.398.g882cbad275-goog