/root/df4892/rpm_wrap_demo.c: In function 'main':
/root/df4892/rpm_wrap_demo.c:36:29: warning: integer overflow in expression of type 'int' results in '2115098112' [-Woverflow]
   uint32_t r32 = 60 * 25000 * 10000 / tach_period[j];
                             ^
/root/df4892/rpm_wrap_demo.c:47:30: warning: integer overflow in expression of type 'int' results in '2115098112' [-Woverflow]
    uint32_t p32 = 60 * 25000 * 10000 / (8 * req[j]);
                              ^
DF-4892 smu7 fan RPM math: 60 * xclk * 10000 (u32 vs u64)
xclk=25000  u32: 2115098112   u64: 15000000000    wrap: YES
xclk=27000  u32: 3315098112   u64: 16200000000    wrap: YES
xclk=6250   u32: 3750000000   u64: 3750000000     wrap: no

get_fan_speed_rpm (:100): reported RPM for real tach periods
tach_period=1        kernel(u32)=2115098112   correct(u64)=15000000000  error=12884901888x
tach_period=100      kernel(u32)=21150981     correct(u64)=150000000    error=128849019x
tach_period=1000     kernel(u32)=2115098      correct(u64)=15000000     error=12884902x
tach_period=100000   kernel(u32)=21150        correct(u64)=150000       error=128850x
tach_period=2000000  kernel(u32)=1057         correct(u64)=7500         error=6443x

set_fan_speed_rpm (:273): programmed TARGET_PERIOD for requests
rpm=800    kernel(u32)=330484       correct(u64)=2343750      -> fan target off by 7.09x
rpm=1500   kernel(u32)=176258       correct(u64)=1250000      -> fan target off by 7.09x
rpm=2200   kernel(u32)=120176       correct(u64)=852272       -> fan target off by 7.09x
rpm=3000   kernel(u32)=88129        correct(u64)=625000       -> fan target off by 7.09x
---
DragonFly dfbsd 6.5-DEVELOPMENT DragonFly 6.5-DEVELOPMENT #0: Thu Jul  2 06:02:54 UTC 2026     root@dfbsd:/usr/obj/usr/src/sys/X86_64_GENERIC  x86_64
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