Re:回复: [PATCH RESENT] cpufreq: amd-pstate: add quirk for Ryzen 3000 series processor

[David Wang]

Hi, 

At 2024-08-22 12:25:49, "Du, Xiaojian" <Xiaojian.Du@xxxxxxx> wrote:
>[AMD Official Use Only - AMD Internal Distribution Only]
>
>Hi David,
>
>I built one test combination: B550 motherboard+ R9-3900X CPU+ 6.10-rc4 kernel.
>On my test machine, amd-pstate driver passive/active mode works after enabling CPPC in BIOS, no code change in amd-pstate.
>My BIOS is updated on 2023 Aug. But no matter CPPC is enabled or not in BIOS, "lscpu" won't show CPPC flag on R9-3900X CPU.
>Any chance to update your BIOS first?
>Noticed your motherboard is "MSI B450M MORTAR MAX", the latest three versions of BIOS are released in 2024 Aug. 21st/2024 Aug. 9th/2023 Oct. 26th.
>https://www.msi.cn/Motherboard/B450M-MORTAR-MAX/support
>
Thanks for the information.   (I did change my BIOS's CPPC config from "auto" to "enable", but error message still.)
But according to   another mail from gautham.shenoy@xxxxxxx,  my understanding is that my CPU(AMD Ryzen 3 3100 4-Core Processor) does not have this CPPC feature,  would upgrade my BIOS really help?
```
    I checked the publicly available PPRs of the Family 17h models 0x60
    (Renoir) [1] and Family 17h model 0x71 (Matisse) [2]. In both these
    PPRs, CPUID 0x80000008 EBX[27] is a reserved bit.
    
    In fact, David reported this issue on Matisse system.
```

Anyway, I will give BIOS upgrading  a try. 

>If this issue is fixed in BIOS, no need to modify the upstream kernel code, right?

I think , even when upgrading BIOS would not help, the quirk just for my system is not worth be in kernel :)......

>
>Thanks,
>Xiaojian
>

Thanks
David