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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 <venture@google.com>
Reviewed-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
This commit is contained in:
Patrick Venture 2017-09-11 15:41:55 -07:00 committed by Guenter Roeck
parent fd53f62160
commit 762b1e8880
1 changed files with 1 additions and 1 deletions
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2
drivers/hwmon/aspeed-pwm-tacho.c
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@ -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. */