diff options
| author | Cole Nelson <colex.nelson@intel.com> | 2017-05-16 11:38:59 -0700 |
|---|---|---|
| committer | Aaron Durbin <adurbin@chromium.org> | 2018-04-09 17:49:18 +0000 |
| commit | f357c2562ac2b27f2520e8591a27001f39dc7e92 (patch) | |
| tree | 2f114b96d02f600b65d96d2e6b079f8368ef16bd /src/soc/intel/apollolake/cpu.c | |
| parent | b10e96f1969bf7ab1a4c83abc484aa4873af950e (diff) | |
soc/intel/apollolake: enable MONITOR/MWAIT for GLK
MONITOR/MWAIT had an irremediable hardware bug for Apollolake.
This has been fixed for GLK. Therefore, make MONITOR/MWAIT based
C-states the default for GLK and disable IO-Redirection based
C-states used for Apollolake.
Tested on GLK w/kernel 4.14.27 using turbostat to observe C-state
residencies with and without load.
Tested for S0ix entry and exit using:
"echo freeze > /sys/power/state" and "suspend_stress_test -c 500".
BUG=b:77639897
Change-Id: If648c25a9b26c04b278dce4af241d439790288ca
Signed-off-by: Cole Nelson <colex.nelson@intel.com>
Signed-off-by: Venkateswarlu Vinjamuri <venkateswarlu.v.vinjamuri@intel.com>
Reviewed-on: https://review.coreboot.org/19718
Reviewed-by: Aaron Durbin <adurbin@chromium.org>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Diffstat (limited to 'src/soc/intel/apollolake/cpu.c')
| -rw-r--r-- | src/soc/intel/apollolake/cpu.c | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/src/soc/intel/apollolake/cpu.c b/src/soc/intel/apollolake/cpu.c index d093acc06a..172a2b9708 100644 --- a/src/soc/intel/apollolake/cpu.c +++ b/src/soc/intel/apollolake/cpu.c @@ -45,6 +45,7 @@ #include <soc/pm.h> static const struct reg_script core_msr_script[] = { +#if !IS_ENABLED(CONFIG_SOC_INTEL_GLK) /* Enable C-state and IO/MWAIT redirect */ REG_MSR_WRITE(MSR_PMG_CST_CONFIG_CONTROL, (PKG_C_STATE_LIMIT_C2_MASK | CORE_C_STATE_LIMIT_C10_MASK @@ -56,6 +57,7 @@ static const struct reg_script core_msr_script[] = { REG_MSR_RMW(MSR_POWER_CTL, ~0x2, 0), /* Disable support for MONITOR and MWAIT instructions */ REG_MSR_RMW(MSR_IA32_MISC_ENABLES, ~MONITOR_MWAIT_DIS_MASK, 0), +#endif /* * Enable and Lock the Advanced Encryption Standard (AES-NI) * feature register |