D40139.id.diff
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D40139.id.diff
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	diff --git a/sys/x86/cpufreq/hwpstate_amd.c b/sys/x86/cpufreq/hwpstate_amd.c
	--- a/sys/x86/cpufreq/hwpstate_amd.c
	+++ b/sys/x86/cpufreq/hwpstate_amd.c
	@@ -137,6 +137,11 @@
	"If enabled (1), limit administrative control of P-states to the value in "
	"CurPstateLimit");

	+static bool hwpstate_prefer_msr;
	+SYSCTL_BOOL(_debug, OID_AUTO, hwpstate_prefer_msr, CTLFLAG_RDTUN,
	+ &hwpstate_prefer_msr, 0,
	+ "If enabled (1), use MSR instead of acpi_perf for P-state information");
	+
	static device_method_t hwpstate_methods[] = {
	/* Device interface */
	DEVMETHOD(device_identify, hwpstate_identify),
	@@ -379,7 +384,7 @@
	*/
	HWPSTATE_DEBUG(dev, "acpi_perf will take care of pstate transitions.\n");
	return (ENXIO);
	- } else {
	+ } else if (!hwpstate_prefer_msr) {
	/*
	* If acpi_perf has INFO_ONLY flag, (_PCT has FFixedHW)
	* we can get _PSS info from acpi_perf
	@@ -391,9 +396,9 @@
	}
	}

	- if (error == 0) {
	+ if (error == 0 && !hwpstate_prefer_msr) {
	/*
	- * Now we get _PSS info from acpi_perf without error.
	+ * We got _PSS info from acpi_perf without error.
	* Let's check it.
	*/
	msr = rdmsr(MSR_AMD_10H_11H_LIMIT);
	@@ -408,7 +413,7 @@
	* If we cannot get info from acpi_perf,
	* Let's get info from MSRs.
	*/
	- if (error)
	+ if (error \|\| hwpstate_prefer_msr)
	error = hwpstate_get_info_from_msr(dev);
	if (error)
	return (error);