The tach shouldn't use both edges to measure. When the tach input duty cycle isn't 50% the return value will inaccurate. Signed-off-by: Billy Tsai <billy_tsai@xxxxxxxxxxxxxx> --- drivers/hwmon/aspeed-pwm-tacho.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/hwmon/aspeed-pwm-tacho.c b/drivers/hwmon/aspeed-pwm-tacho.c index 3d8239fd66ed..0a70a0e22acf 100644 --- a/drivers/hwmon/aspeed-pwm-tacho.c +++ b/drivers/hwmon/aspeed-pwm-tacho.c @@ -158,7 +158,7 @@ * 10: both * 11: reserved. */ -#define M_TACH_MODE 0x02 /* 10b */ +#define M_TACH_MODE 0x00 /* 10b */ #define M_TACH_UNIT 0x0210 #define INIT_FAN_CTRL 0xFF -- 2.25.1
