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cppc_acpi: print error message if CPPC is unsupported

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The amd-pstate driver can fail when _CPC objects are not supported by
the CPU. However, the current error message is ambiguous (see below) and
there is no clear way for attributing the failure of the amd-pstate
driver to the lack of CPPC support.

[    0.477523] amd_pstate: the _CPC object is not present in SBIOS or ACPI disabled

Fix this by adding an debug message to notify the user if the amd-pstate
driver failed to load due to CPPC not be supported by the CPU

Reviewed-by: Mario Limonciello <mario.limonciello@amd.com>
Reviewed-by: Gautham R. Shenoy <gautham.shenoy@amd.com>
Tested-by: Dhananjay Ugwekar <Dhananjay.Ugwekar@amd.com>
Signed-off-by: Perry Yuan <perry.yuan@amd.com>
Acked-by: Huang Rui <ray.huang@amd.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
This commit is contained in:
Perry Yuan 2024-04-25 16:07:57 +08:00 committed by Rafael J. Wysocki
parent 069a2bb8c4
commit 5f8f9bc4d7
1 changed files with 3 additions and 1 deletions
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4
drivers/acpi/cppc_acpi.c
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@ -686,8 +686,10 @@ int acpi_cppc_processor_probe(struct acpi_processor *pr)
if (!osc_sb_cppc2_support_acked) {
pr_debug("CPPC v2 _OSC not acked\n");
if (!cpc_supported_by_cpu())
if (!cpc_supported_by_cpu()) {
pr_debug("CPPC is not supported by the CPU\n");
return -ENODEV;
}
}
/* Parse the ACPI _CPC table for this CPU. */