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| author | Erwan Velu <erwanaliasr1@gmail.com> | 2019-02-20 11:10:17 +0100 |
|---|---|---|
| committer | Rafael J. Wysocki <rafael.j.wysocki@intel.com> | 2019-02-20 13:16:06 +0100 |
| commit | 1222d527f314c86a3b59a522115d62facc5a7965 (patch) | |
| tree | cdc5e51c349f65198f21a7a54fb1a1628772bf02 /drivers/cpufreq | |
| parent | 167a38dcd5caaa85994ac8b7d2d1c20a71cd947b (diff) | |
| download | linux-1222d527f314c86a3b59a522115d62facc5a7965.tar.bz2 | |
cpufreq: acpi-cpufreq: Report if CPU doesn't support boost technologies
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>
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 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); |