[Bug 216189] New: amd-pstate stops working after S3 suspend

[bugzilla-daemon@kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=216189

            Bug ID: 216189
           Summary: amd-pstate stops working after S3 suspend
           Product: Power Management
           Version: 2.5
    Kernel Version: 5.18.8
          Hardware: AMD
                OS: Linux
              Tree: Mainline
            Status: NEW
          Severity: normal
          Priority: P1
         Component: cpufreq
          Assignee: linux-pm@vger.kernel.org
          Reporter: a@annel.in
        Regression: No

Hardware: Lenovo Thinkpad T14 Gen2 AMD  
CPU: AMD Ryzen 7 PRO 5850U  
Kernel: 5.18.8  (tried linux-next too)  


I've managed to get new `amd-pstate` driver working on my system, but after
suspend (S3) it stops working and CPU frequency and Boost state control is not
working. 

Falling back to `acpi-cpufreq` driver solves the issue — suspend no longer
breaks CPU frequency and Boost controls. 


```
    ~ sudo cpupower frequency-info                                              
    analyzing CPU 0:
      driver: amd-pstate
      CPUs which run at the same hardware frequency: 0
      CPUs which need to have their frequency coordinated by software: 0
      maximum transition latency: 131 us
      hardware limits: 400 MHz - 1.90 GHz
      available cpufreq governors: ondemand performance schedutil
      current policy: frequency should be within 800 MHz and 1.50 GHz.
                      The governor "ondemand" may decide which speed to use
                      within this range.
      current CPU frequency: Unable to call hardware
      current CPU frequency: 3.41 GHz (asserted by call to kernel)

     boost state support:
        Supported: yes
        Active: no
        AMD PSTATE Highest Performance: 166. Maximum Frequency: 4.51 GHz.
        AMD PSTATE Nominal Performance: 70. Nominal Frequency: 1.90 GHz.
        AMD PSTATE Lowest Non-linear Performance: 41. Lowest Non-linear
Frequency: 1.11 GHz.
        AMD PSTATE Lowest Performance: 15. Lowest Frequency: 400 MHz.
```

As we see here, frequency limits are set to 800 MHz - 1.50 GHz and boost stats
is inactive, but actual CPU frequency 3.41 GHz (that means boost is on and
limits are ignored)  

The things starts working again only after reboot.  

Any commands such as 
```
echo 1 > /sys/devices/system/cpu/cpufreq/boost
echo 0 > /sys/devices/system/cpu/cpufreq/boost
cpupower frequency-set -g ondemand -d 400MHz -u 800MHz
cpupower frequency-set -g performance -d 1.9GHz -u 1.9GHz

```

just does nothing. (after reboot they start working again of course)  


There are no mentions of pstate module in dmesg, but maybe I have to enable
some debug (how to do it?)  

Simillar bug for intel_pstate:
https://bugzilla.kernel.org/show_bug.cgi?id=90421  
Maybe it is related some way.

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