diff options
author | Wonkyu Kim <wonkyu.kim@intel.com> | 2020-04-27 17:13:41 -0700 |
---|---|---|
committer | Patrick Georgi <pgeorgi@google.com> | 2020-05-11 08:38:07 +0000 |
commit | ec65adcf7e18fe91e7d4a0bfbebcdf50193de9a2 (patch) | |
tree | eefc09817e64627a8c276bad6ddc02db0b92045c /src/soc/intel/tigerlake/cpu.c | |
parent | 61b617c9336781ac8e912a6ba7ecc2b718c5659e (diff) |
soc/intel/tigerlake: Update C-State info
C-State latency table was exposed by both intel-idle driver and
BIOS/coreboot. And table in Kernel was used before.
After kernel patch (https://patchwork.kernel.org/patch/11290319/),
only BIOS/coreboot exposes C-State latency table through _CST.
As current C-State latency table info is not correct for Tigerlake,
update proper info according to BWG and reference code.
- Update latency: CpuPowerMgmt.h
Use BIOS reference code as values in BWG is not up-to-dated
- Remove MSR program for latency: BWG 4.6.4.3.4
Reference:
- TGL BWG #611569 Rev 0.7.6
- https://github.com/otcshare/CCG-TGL-Generic-SiC/blob/master/
ClientOneSiliconPkg/Cpu/Include/CpuPowerMgmt.h
BUG=b:155223704
BRANCH=None
TEST=Boot to OS and check C-State latency
expected result
>cat /sys/devices/system/cpu/cpu0/cpuidle/state*/{name,latency}
POLL
C1_ACPI
C2_ACPI
C3_ACPI
0
1
253
1048
For detail, refer Bug info.
Signed-off-by: Wonkyu Kim <wonkyu.kim@intel.com>
Change-Id: I8bf2976ad35b4cf6f637a99c26b4f98f9f6ee563
Reviewed-on: https://review.coreboot.org/c/coreboot/+/40816
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Subrata Banik <subrata.banik@intel.com>
Reviewed-by: Nick Vaccaro <nvaccaro@google.com>
Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net>
Reviewed-by: Srinidhi N Kaushik <srinidhi.n.kaushik@intel.com>
Diffstat (limited to 'src/soc/intel/tigerlake/cpu.c')
-rw-r--r-- | src/soc/intel/tigerlake/cpu.c | 36 |
1 files changed, 0 insertions, 36 deletions
diff --git a/src/soc/intel/tigerlake/cpu.c b/src/soc/intel/tigerlake/cpu.c index d33194e4c9..64ba2f9909 100644 --- a/src/soc/intel/tigerlake/cpu.c +++ b/src/soc/intel/tigerlake/cpu.c @@ -144,39 +144,6 @@ static void set_energy_perf_bias(u8 policy) wrmsr(IA32_ENERGY_PERF_BIAS, msr); } -static void configure_c_states(void) -{ - msr_t msr; - - /* C-state Interrupt Response Latency Control 1 - package C6/C7 short */ - msr.hi = 0; - msr.lo = IRTL_VALID | IRTL_32768_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_32768_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_32768_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_32768_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_32768_NS | - C_STATE_LATENCY_CONTROL_5_LIMIT; - wrmsr(MSR_C_STATE_LATENCY_CONTROL_5, msr); -} - /* All CPUs including BSP will run the following function. */ void soc_core_init(struct device *cpu) { @@ -190,9 +157,6 @@ void soc_core_init(struct device *cpu) enable_lapic_tpr(); setup_lapic(); - /* Configure c-state interrupt response time */ - configure_c_states(); - /* Configure Enhanced SpeedStep and Thermal Sensors */ configure_misc(); |