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

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Message-ID: <38b23ce.4a8c.191789c4356.Coremail.00107082@163.com>
Date: Thu, 22 Aug 2024 13:43:12 +0800 (CST)
From: "David Wang" <00107082@....com>
To: "Du, Xiaojian" <Xiaojian.Du@....com>
Cc: "rafael.j.wysocki@...el.com" <rafael.j.wysocki@...el.com>, 
	"Limonciello, Mario" <Mario.Limonciello@....com>, 
	"viresh.kumar@...aro.org" <viresh.kumar@...aro.org>, 
	"Huang, Ray" <Ray.Huang@....com>, 
	"Shenoy, Gautham Ranjal" <gautham.shenoy@....com>, 
	"Petkov, Borislav" <Borislav.Petkov@....com>, 
	"Huang, Shimmer" <Shimmer.Huang@....com>, 
	"Meng, Li (Jassmine)" <Li.Meng@....com>, 
	"linux-pm@...r.kernel.org" <linux-pm@...r.kernel.org>, 
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>, 
	"Yuan, Perry" <Perry.Yuan@....com>
Subject: Re:回复: [PATCH RESENT] cpufreq: amd-pstate: add quirk for Ryzen 3000 series processor

Hi, 

At 2024-08-22 12:25:49, "Du, Xiaojian" <Xiaojian.Du@....com> 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@....com,  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