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| H A D | aspeed-pwm-tacho.c | diff ece0c03a9e5f727435d19754411e59c3ae28cbb8 Sat Jun 24 17:39:32 CEST 2017 Patrick Venture <venture@google.com> 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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