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    Subject[PATCH 5.9 212/391] acpi-cpufreq: Honor _PSD table setting on new AMD CPUs
    Date
    From: Wei Huang <wei.huang2@amd.com>

    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: acd316248205 ("acpi-cpufreq: Add quirk to disable _PSD usage on all AMD CPUs")
    Signed-off-by: Wei Huang <wei.huang2@amd.com>
    [ rjw: Subject edit ]
    Cc: 3.10+ <stable@vger.kernel.org> # 3.10+
    Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
    Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

    ---
    drivers/cpufreq/acpi-cpufreq.c | 3 ++-
    1 file changed, 2 insertions(+), 1 deletion(-)

    --- a/drivers/cpufreq/acpi-cpufreq.c
    +++ b/drivers/cpufreq/acpi-cpufreq.c
    @@ -691,7 +691,8 @@ static int acpi_cpufreq_cpu_init(struct
    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,

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