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path: root/drivers/idle/intel_idle.c
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Diffstat (limited to 'drivers/idle/intel_idle.c')
-rw-r--r--drivers/idle/intel_idle.c33
1 files changed, 33 insertions, 0 deletions
diff --git a/drivers/idle/intel_idle.c b/drivers/idle/intel_idle.c
index ec1b9d306ba6..e6c543b5ee1d 100644
--- a/drivers/idle/intel_idle.c
+++ b/drivers/idle/intel_idle.c
@@ -1484,6 +1484,36 @@ static void __init sklh_idle_state_table_update(void)
skl_cstates[6].flags |= CPUIDLE_FLAG_UNUSABLE; /* C9-SKL */
}
+/**
+ * skx_idle_state_table_update - Adjust the Sky Lake/Cascade Lake
+ * idle states table.
+ */
+static void __init skx_idle_state_table_update(void)
+{
+ unsigned long long msr;
+
+ rdmsrl(MSR_PKG_CST_CONFIG_CONTROL, msr);
+
+ /*
+ * 000b: C0/C1 (no package C-state support)
+ * 001b: C2
+ * 010b: C6 (non-retention)
+ * 011b: C6 (retention)
+ * 111b: No Package C state limits.
+ */
+ if ((msr & 0x7) < 2) {
+ /*
+ * Uses the CC6 + PC0 latency and 3 times of
+ * latency for target_residency if the PC6
+ * is disabled in BIOS. This is consistent
+ * with how intel_idle driver uses _CST
+ * to set the target_residency.
+ */
+ skx_cstates[2].exit_latency = 92;
+ skx_cstates[2].target_residency = 276;
+ }
+}
+
static bool __init intel_idle_verify_cstate(unsigned int mwait_hint)
{
unsigned int mwait_cstate = MWAIT_HINT2CSTATE(mwait_hint) + 1;
@@ -1515,6 +1545,9 @@ static void __init intel_idle_init_cstates_icpu(struct cpuidle_driver *drv)
case INTEL_FAM6_SKYLAKE:
sklh_idle_state_table_update();
break;
+ case INTEL_FAM6_SKYLAKE_X:
+ skx_idle_state_table_update();
+ break;
}
for (cstate = 0; cstate < CPUIDLE_STATE_MAX; ++cstate) {