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From: bugzilla-daemon@kernel.org
To: linux-pm@vger.kernel.org
Subject: [Bug 218171] amd-pstate not loading on zen2 threadripper 3960x (trx40
Date: Fri, 26 Jan 2024 04:33:55 +0000	[thread overview]
Message-ID: <bug-218171-137361-0K2vCmwnDf@https.bugzilla.kernel.org/> (raw)
In-Reply-To: <bug-218171-137361@https.bugzilla.kernel.org/>

https://bugzilla.kernel.org/show_bug.cgi?id=218171

--- Comment #40 from Perry Yuan(AMD) (Perry.Yuan@amd.com) ---
Thank you everyone for the testing results!!

Because of the TR40 CPU hardware pstate was implemented by CPPC V2 and shared
memory design(PCC channel), so the ACPI table is not same as MSR solution. it
is expected after I confirmed with internal team. 

   ResourceTemplate ()
            {
                Register (PCC,
                    0x20,               // Bit Width
                    0x00,               // Bit Offset --> expected
                    0x0000000000000000, // Address
                    ,)
            },

Looks like all the CPPC capabilities on above tested systems are filled
correctly.
I will post the patch for kernel review. 
Let me know if you have any other questions about this issue. 

Perry.

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  parent reply	other threads:[~2024-01-26  4:33 UTC|newest]

Thread overview: 49+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2023-11-21  9:51 [Bug 218171] New: amd-pstate not loading on zen2 threadripper 3960x (trx40 bugzilla-daemon
2023-11-21  9:56 ` [Bug 218171] " bugzilla-daemon
2023-11-21 10:16 ` bugzilla-daemon
2023-11-21 10:48 ` bugzilla-daemon
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