Venkateswarlu V Vinjamuri (venkateswarlu.v.vinjamuri@intel.com) just uploaded a new patch set to gerrit, which you can find at https://review.coreboot.org/17200
-gerrit
commit d52fa3e0ca4320df6db898dc8591d3e9dea69d07 Author: Venkateswarlu Vinjamuri venkateswarlu.v.vinjamuri@intel.com Date: Mon Oct 31 17:03:55 2016 -0700
soc/intel/apollolake: Disable Monitor and Mwait feature
Monitor/Mwait is broken on APL. So, it needs to be disabled.
BUG=chrome-os-partner:56922 BRANCH=None
Change-Id: I12cd4280de62e0a639b43538171660ee4c0a0265 Signed-off-by: Venkateswarlu Vinjamuri venkateswarlu.v.vinjamuri@intel.com --- src/include/cpu/intel/turbo.h | 3 +++ src/soc/intel/apollolake/cpu.c | 3 +++ 2 files changed, 6 insertions(+)
diff --git a/src/include/cpu/intel/turbo.h b/src/include/cpu/intel/turbo.h index 8a93b3c..6626cb1 100644 --- a/src/include/cpu/intel/turbo.h +++ b/src/include/cpu/intel/turbo.h @@ -21,6 +21,9 @@ #define PM_CAP_TURBO_MODE (1 << 1)
#define MSR_IA32_MISC_ENABLES 0x1a0 +/* Disable the Monitor Mwait FSM feature */ +#define MONITOR_MWAIT_DIS_MASK 0x40000 + #define H_MISC_DISABLE_TURBO (1 << 6)
enum { diff --git a/src/soc/intel/apollolake/cpu.c b/src/soc/intel/apollolake/cpu.c index bd5cff5..6b5dee2 100644 --- a/src/soc/intel/apollolake/cpu.c +++ b/src/soc/intel/apollolake/cpu.c @@ -29,6 +29,7 @@ #include <soc/cpu.h> #include <soc/iomap.h> #include <soc/smm.h> +#include <cpu/intel/turbo.h>
static const struct reg_script core_msr_script[] = { /* Enable C-state and IO/MWAIT redirect */ @@ -40,6 +41,8 @@ static const struct reg_script core_msr_script[] = { (ACPI_PMIO_CST_REG | (PMG_IO_BASE_CST_RNG_BLK_SIZE << 16))), /* Disable C1E */ 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), REG_SCRIPT_END };
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Venkateswarlu V Vinjamuri