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Commit 1222d527 authored by Erwan Velu's avatar Erwan Velu Committed by Rafael J. Wysocki
Browse files

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 f7f3dc00 ("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: default avatarErwan Velu <e.velu@criteo.com>
[ rjw: Change the message text somewhat ]
Signed-off-by: default avatarRafael J. Wysocki <rafael.j.wysocki@intel.com>
parent 167a38dc

drivers/cpufreq/acpi-cpufreq.c

+3 −1
Original line number Diff line number Diff line
@@ -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);