diff options
Diffstat (limited to 'src/soc/intel')
| -rw-r--r-- | src/soc/intel/skylake/cpu.c | 41 |
1 files changed, 41 insertions, 0 deletions
diff --git a/src/soc/intel/skylake/cpu.c b/src/soc/intel/skylake/cpu.c index 2f356355b0..c472617b0f 100644 --- a/src/soc/intel/skylake/cpu.c +++ b/src/soc/intel/skylake/cpu.c @@ -360,6 +360,44 @@ static void configure_mca(void) } } +static void configure_c_states(void) +{ + msr_t msr; + + /* C-state Interrupt Response Latency Control 0 - package C3 latency */ + msr.hi = 0; + msr.lo = IRTL_VALID | IRTL_1024_NS | C_STATE_LATENCY_CONTROL_0_LIMIT; + wrmsr(MSR_C_STATE_LATENCY_CONTROL_0, msr); + + /* C-state Interrupt Response Latency Control 1 - package C6/C7 short */ + msr.hi = 0; + msr.lo = IRTL_VALID | IRTL_1024_NS | C_STATE_LATENCY_CONTROL_1_LIMIT; + wrmsr(MSR_C_STATE_LATENCY_CONTROL_1, msr); + + /* C-state Interrupt Response Latency Control 2 - package C6/C7 long */ + msr.hi = 0; + msr.lo = IRTL_VALID | IRTL_1024_NS | C_STATE_LATENCY_CONTROL_2_LIMIT; + wrmsr(MSR_C_STATE_LATENCY_CONTROL_2, msr); + + /* C-state Interrupt Response Latency Control 3 - package C8 */ + msr.hi = 0; + msr.lo = IRTL_VALID | IRTL_1024_NS | + C_STATE_LATENCY_CONTROL_3_LIMIT; + wrmsr(MSR_C_STATE_LATENCY_CONTROL_3, msr); + + /* C-state Interrupt Response Latency Control 4 - package C9 */ + msr.hi = 0; + msr.lo = IRTL_VALID | IRTL_1024_NS | + C_STATE_LATENCY_CONTROL_4_LIMIT; + wrmsr(MSR_C_STATE_LATENCY_CONTROL_4, msr); + + /* C-state Interrupt Response Latency Control 5 - package C10 */ + msr.hi = 0; + msr.lo = IRTL_VALID | IRTL_1024_NS | + C_STATE_LATENCY_CONTROL_5_LIMIT; + wrmsr(MSR_C_STATE_LATENCY_CONTROL_5, msr); +} + /* All CPUs including BSP will run the following function. */ static void cpu_core_init(device_t cpu) { @@ -370,6 +408,9 @@ static void cpu_core_init(device_t cpu) enable_lapic_tpr(); setup_lapic(); + /* Configure c-state interrupt response time */ + configure_c_states(); + /* Configure Enhanced SpeedStep and Thermal Sensors */ configure_misc(); |