From 5f8f9bc4d7bc8d44031b88b548c2572b746e2611 Mon Sep 17 00:00:00 2001 From: Perry Yuan Date: Thu, 25 Apr 2024 16:07:57 +0800 Subject: cppc_acpi: print error message if CPPC is unsupported 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 Reviewed-by: Gautham R. Shenoy Tested-by: Dhananjay Ugwekar Signed-off-by: Perry Yuan Acked-by: Huang Rui Signed-off-by: Rafael J. Wysocki --- drivers/acpi/cppc_acpi.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) (limited to 'drivers/acpi') diff --git a/drivers/acpi/cppc_acpi.c b/drivers/acpi/cppc_acpi.c index 4bfbe55553f4..3134101f31b6 100644 --- a/drivers/acpi/cppc_acpi.c +++ b/drivers/acpi/cppc_acpi.c @@ -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. */ -- cgit v1.2.3