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-rw-r--r--tools/power/cpupower/utils/helpers/misc.c23
1 files changed, 19 insertions, 4 deletions
diff --git a/tools/power/cpupower/utils/helpers/misc.c b/tools/power/cpupower/utils/helpers/misc.c
index 1609243f5c64..601d719d4e60 100644
--- a/tools/power/cpupower/utils/helpers/misc.c
+++ b/tools/power/cpupower/utils/helpers/misc.c
@@ -2,11 +2,14 @@
#include "helpers/helpers.h"
+#define MSR_AMD_HWCR 0xc0010015
+
int cpufreq_has_boost_support(unsigned int cpu, int *support, int *active,
int *states)
{
struct cpupower_cpu_info cpu_info;
int ret;
+ unsigned long long val;
*support = *active = *states = 0;
@@ -16,10 +19,22 @@ int cpufreq_has_boost_support(unsigned int cpu, int *support, int *active,
if (cpupower_cpu_info.caps & CPUPOWER_CAP_AMD_CBP) {
*support = 1;
- amd_pci_get_num_boost_states(active, states);
- if (ret <= 0)
- return ret;
- *support = 1;
+
+ /* AMD Family 0x17 does not utilize PCI D18F4 like prior
+ * families and has no fixed discrete boost states but
+ * has Hardware determined variable increments instead.
+ */
+
+ if (cpu_info.family == 0x17) {
+ if (!read_msr(cpu, MSR_AMD_HWCR, &val)) {
+ if (!(val & CPUPOWER_AMD_CPBDIS))
+ *active = 1;
+ }
+ } else {
+ ret = amd_pci_get_num_boost_states(active, states);
+ if (ret)
+ return ret;
+ }
} else if (cpupower_cpu_info.caps & CPUPOWER_CAP_INTEL_IDA)
*support = *active = 1;
return 0;