diff options
Diffstat (limited to 'arch/x86/cpu/intel_common/cpu.c')
-rw-r--r-- | arch/x86/cpu/intel_common/cpu.c | 20 |
1 files changed, 20 insertions, 0 deletions
diff --git a/arch/x86/cpu/intel_common/cpu.c b/arch/x86/cpu/intel_common/cpu.c index 7d0ed73b4b..1898903853 100644 --- a/arch/x86/cpu/intel_common/cpu.c +++ b/arch/x86/cpu/intel_common/cpu.c @@ -145,3 +145,23 @@ int cpu_configure_thermal_target(struct udevice *dev) return 0; } + +void cpu_set_perf_control(uint clk_ratio) +{ + msr_t perf_ctl; + + perf_ctl.lo = (clk_ratio & 0xff) << 8; + perf_ctl.hi = 0; + msr_write(MSR_IA32_PERF_CTL, perf_ctl); + debug("CPU: frequency set to %d MHz\n", clk_ratio * INTEL_BCLK_MHZ); +} + +bool cpu_config_tdp_levels(void) +{ + msr_t platform_info; + + /* Bits 34:33 indicate how many levels supported */ + platform_info = msr_read(MSR_PLATFORM_INFO); + + return ((platform_info.hi >> 1) & 3) != 0; +} |