diff options
| author | Erwan Velu <erwanaliasr1@gmail.com> | 2019-02-20 11:10:17 +0100 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2019-04-05 22:33:03 +0200 |
| commit | e57f4676b92fb8764e6a3ecee182f991345a38f3 (patch) | |
| tree | ba0b82e59dea200c8e9b6617326c1ba8420c2829 /drivers/cpufreq | |
| parent | eb70531a95c84ac3780a6ffc7e8d698ee5862b52 (diff) | |
cpufreq: acpi-cpufreq: Report if CPU doesn't support boost technologies
[ 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>
Diffstat (limited to 'drivers/cpufreq')
| -rw-r--r-- | drivers/cpufreq/acpi-cpufreq.c | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/drivers/cpufreq/acpi-cpufreq.c b/drivers/cpufreq/acpi-cpufreq.c index b61f4ec43e06..aca30f45172e 100644 --- a/drivers/cpufreq/acpi-cpufreq.c +++ b/drivers/cpufreq/acpi-cpufreq.c @@ -911,8 +911,10 @@ 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); |