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    Subject[PATCH AUTOSEL 5.0 109/262] cpufreq: acpi-cpufreq: Report if CPU doesn't support boost technologies
    Date
    From: Erwan Velu <erwanaliasr1@gmail.com>

    [ Upstream commit 1222d527f314c86a3b59a522115d62facc5a7965 ]

    There is some rare cases where CPB (and possibly IDA) are missing on
    processors.

    This is the case fixed by commit f7f3dc00f612 ("x86/cpu/AMD: Fix
    erratum 1076 (CPB bit)") and following.

    In such context, the boost status isn't reported by
    /sys/devices/system/cpu/cpufreq/boost.

    This commit is about printing a message to report that the CPU
    doesn't expose the boost capabilities.

    This message could help debugging platforms hit by this phenomena.

    Signed-off-by: Erwan Velu <e.velu@criteo.com>
    [ rjw: Change the message text somewhat ]
    Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
    Signed-off-by: Sasha Levin <sashal@kernel.org>
    ---
    drivers/cpufreq/acpi-cpufreq.c | 4 +++-
    1 file changed, 3 insertions(+), 1 deletion(-)

    diff --git a/drivers/cpufreq/acpi-cpufreq.c b/drivers/cpufreq/acpi-cpufreq.c
    index d62fd374d5c7..c72258a44ba4 100644
    --- a/drivers/cpufreq/acpi-cpufreq.c
    +++ b/drivers/cpufreq/acpi-cpufreq.c
    @@ -916,8 +916,10 @@ static void __init acpi_cpufreq_boost_init(void)
    {
    int ret;

    - if (!(boot_cpu_has(X86_FEATURE_CPB) || boot_cpu_has(X86_FEATURE_IDA)))
    + if (!(boot_cpu_has(X86_FEATURE_CPB) || boot_cpu_has(X86_FEATURE_IDA))) {
    + pr_debug("Boost capabilities not present in the processor\n");
    return;
    + }

    acpi_cpufreq_driver.set_boost = set_boost;
    acpi_cpufreq_driver.boost_enabled = boost_state(0);
    --
    2.19.1
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