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Commit 57cbc85d authored by Wei Huang's avatar Wei Huang Committed by Greg Kroah-Hartman
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acpi-cpufreq: Honor _PSD table setting on new AMD CPUs 



commit 5368512abe08a28525d9b24abbfc2a72493e8dba upstream.

acpi-cpufreq has a old quirk that overrides the _PSD table supplied by
BIOS on AMD CPUs. However the _PSD table of new AMD CPUs (Family 19h+)
now accurately reports the P-state dependency of CPU cores. Hence this
quirk needs to be fixed in order to support new CPUs' frequency control.

Fixes: acd31624 ("acpi-cpufreq: Add quirk to disable _PSD usage on all AMD CPUs")
Signed-off-by: default avatarWei Huang <wei.huang2@amd.com>
[ rjw: Subject edit ]
Cc: 3.10+ <stable@vger.kernel.org> # 3.10+
Signed-off-by: default avatarRafael J. Wysocki <rafael.j.wysocki@intel.com>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent 2d32e601

drivers/cpufreq/acpi-cpufreq.c

+2 −1
Original line number Diff line number Diff line
@@ -701,7 +701,8 @@ static int acpi_cpufreq_cpu_init(struct cpufreq_policy *policy) 
		cpumask_copy(policy->cpus, topology_core_cpumask(cpu));

	}



	if (check_amd_hwpstate_cpu(cpu) && !acpi_pstate_strict) {

	if (check_amd_hwpstate_cpu(cpu) && boot_cpu_data.x86 < 0x19 &&

	    !acpi_pstate_strict) {

		cpumask_clear(policy->cpus);

		cpumask_set_cpu(cpu, policy->cpus);

		cpumask_copy(data->freqdomain_cpus,