Patch "ACPI: CPPC: enable AMD CPPC V2 support for family 17h processors" has been added to the 6.6-stable tree

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This is a note to let you know that I've just added the patch titled

    ACPI: CPPC: enable AMD CPPC V2 support for family 17h processors

to the 6.6-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     acpi-cppc-enable-amd-cppc-v2-support-for-family-17h-.patch
and it can be found in the queue-6.6 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.



commit 119bcc7b5f95ac288765cb98874eda2f0ccc9c33
Author: Perry Yuan <perry.yuan@xxxxxxx>
Date:   Thu Feb 8 11:46:28 2024 +0800

    ACPI: CPPC: enable AMD CPPC V2 support for family 17h processors
    
    [ Upstream commit a51ab63b297ce9e26e3ffb9be896018a42d5f32f ]
    
    As there are some AMD processors which only support CPPC V2 firmware and
    BIOS implementation, the amd_pstate driver will be failed to load when
    system booting with below kernel warning message:
    
    [    0.477523] amd_pstate: the _CPC object is not present in SBIOS or ACPI disabled
    
    To make the amd_pstate driver can be loaded on those TR40 processors, it
    needs to match x86_model from 0x30 to 0x7F for family 17H.
    With the change, the system can load amd_pstate driver as expected.
    
    Reviewed-by: Mario Limonciello <mario.limonciello@xxxxxxx>
    Reported-by: Gino Badouri <badouri.g@xxxxxxxxx>
    Closes: https://bugzilla.kernel.org/show_bug.cgi?id=218171
    Fixes: fbd74d1689 ("ACPI: CPPC: Fix enabling CPPC on AMD systems with shared memory")
    Signed-off-by: Perry Yuan <perry.yuan@xxxxxxx>
    Reviewed-by: Gautham R. Shenoy <gautham.shenoy@xxxxxxx>
    Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@xxxxxxxxx>
    Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>

diff --git a/arch/x86/kernel/acpi/cppc.c b/arch/x86/kernel/acpi/cppc.c
index 8d8752b44f113..ff8f25faca3dd 100644
--- a/arch/x86/kernel/acpi/cppc.c
+++ b/arch/x86/kernel/acpi/cppc.c
@@ -20,7 +20,7 @@ bool cpc_supported_by_cpu(void)
 		    (boot_cpu_data.x86_model >= 0x20 && boot_cpu_data.x86_model <= 0x2f)))
 			return true;
 		else if (boot_cpu_data.x86 == 0x17 &&
-			 boot_cpu_data.x86_model >= 0x70 && boot_cpu_data.x86_model <= 0x7f)
+			 boot_cpu_data.x86_model >= 0x30 && boot_cpu_data.x86_model <= 0x7f)
 			return true;
 		return boot_cpu_has(X86_FEATURE_CPPC);
 	}




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