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Diffstat (limited to 'src/soc/intel/elkhartlake/cpu.c')
-rw-r--r--src/soc/intel/elkhartlake/cpu.c28
1 files changed, 0 insertions, 28 deletions
diff --git a/src/soc/intel/elkhartlake/cpu.c b/src/soc/intel/elkhartlake/cpu.c
index c51f3fa550..720a295e15 100644
--- a/src/soc/intel/elkhartlake/cpu.c
+++ b/src/soc/intel/elkhartlake/cpu.c
@@ -25,31 +25,6 @@ static void soc_fsp_load(void)
fsps_load(romstage_handoff_is_resume());
}
-static void configure_isst(void)
-{
- config_t *conf = config_of_soc();
- msr_t msr;
-
- if (conf->speed_shift_enable) {
- /*
- * Kernel driver checks CPUID.06h:EAX[Bit 7] to determine if HWP
- * is supported or not. coreboot needs to configure MSR 0x1AA
- * which is then reflected in the CPUID register.
- */
- msr = rdmsr(MSR_MISC_PWR_MGMT);
- msr.lo |= MISC_PWR_MGMT_ISST_EN; /* Enable Speed Shift */
- msr.lo |= MISC_PWR_MGMT_ISST_EN_INT; /* Enable Interrupt */
- msr.lo |= MISC_PWR_MGMT_ISST_EN_EPP; /* Enable EPP */
- wrmsr(MSR_MISC_PWR_MGMT, msr);
- } else {
- msr = rdmsr(MSR_MISC_PWR_MGMT);
- msr.lo &= ~MISC_PWR_MGMT_ISST_EN; /* Disable Speed Shift */
- msr.lo &= ~MISC_PWR_MGMT_ISST_EN_INT; /* Disable Interrupt */
- msr.lo &= ~MISC_PWR_MGMT_ISST_EN_EPP; /* Disable EPP */
- wrmsr(MSR_MISC_PWR_MGMT, msr);
- }
-}
-
static void configure_misc(void)
{
msr_t msr;
@@ -116,9 +91,6 @@ void soc_core_init(struct device *cpu)
/* Configure Enhanced SpeedStep and Thermal Sensors */
configure_misc();
- /* Configure Intel Speed Shift */
- configure_isst();
-
/* Enable PM timer emulation */
enable_pm_timer_emulation();