hwmon: (aspeed-pwm-tacho) reduce fan_tach period
Reduce the fan_tach period such that the fan controller uses a shorter period to measure the rpm. The original period of 0x1000 was chosen as a conversative value from the reference implementation. Through experimentation on the quanta-q71l board, I was able to drive the number down which ultimately reduced the time the controller would use to determine the fan_tach. This value was recently tested and accepted downstream on the IBM Zaius board which uses the ast2500. Future work: It may be worthwhile as this is a tunable parameter to the system, to allow overriding it through the device tree. Testing: Tested on an ast2400 sitting on a quanta-q71l and ast2500 on power9. Signed-off-by: Patrick Venture <venture@google.com> Signed-off-by: Guenter Roeck <linux@roeck-us.net>
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@ -160,7 +160,7 @@
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* 11: reserved.
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*/
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#define M_TACH_MODE 0x02 /* 10b */
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#define M_TACH_UNIT 0x1000
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#define M_TACH_UNIT 0x00c0
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#define INIT_FAN_CTRL 0xFF
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struct aspeed_pwm_tacho_data {
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