hwmon: (aspeed-pwm-tacho) increase fan tach period

The previous value reduced the time required to determine the fan value, however, it's also used as the final timeout mechanism. The prevous value would work for any fan speed greater than around 3k RPM. This increased value, lets the fan speeds return quickly but will wait longer to handle speeds below 3k RPM. Testing: this value was determined through experimentation on the ast2400 on the Quanta-q71l. This configurations runs 8 fans attached to the controller. Signed-off-by: Patrick Venture <[email protected]> Reviewed-by: Guenter Roeck <[email protected]> Signed-off-by: Guenter Roeck <[email protected]>
jangid · Oct 30, 2017 · 762b1e8 · 762b1e8
1 parent fd53f62
commit 762b1e8
Showing 1 changed file with 1 addition and 1 deletion.
diff --git a/drivers/hwmon/aspeed-pwm-tacho.c b/drivers/hwmon/aspeed-pwm-tacho.c
@@ -161,7 +161,7 @@
  * 11: reserved.
  */
 #define M_TACH_MODE 0x02 /* 10b */
-#define M_TACH_UNIT 0x00c0
+#define M_TACH_UNIT 0x0210
 #define INIT_FAN_CTRL 0xFF
 
 /* How long we sleep in us while waiting for an RPM result. */