diff options
| author | Len Brown <len.brown@intel.com> | 2011-02-16 06:32:48 (GMT) |
|---|---|---|
| committer | Len Brown <len.brown@intel.com> | 2011-02-17 22:08:48 (GMT) |
| commit | bfb53ccf1c734b1907df7189eef4c08489827951 (patch) | |
| tree | 7d93bac0a87b89c9e7f87c4bad2e43fcef6725f1 | |
| parent | 14796fca2bd22acc73dd0887248d003b0f441d08 (diff) | |
| download | linux-fsl-qoriq-bfb53ccf1c734b1907df7189eef4c08489827951.tar.xz | |
intel_idle: disable Atom/Lincroft HW C-state auto-demotion
Just as we had to disable auto-demotion for NHM/WSM,
we need to do the same for Atom (Lincroft version).
In particular, auto-demotion will prevent Lincroft
from entering the S0i3 idle power saving state.
https://bugzilla.kernel.org/show_bug.cgi?id=25252
Signed-off-by: Len Brown <len.brown@intel.com>
| -rw-r--r-- | arch/x86/include/asm/msr-index.h | 1 | ||||
| -rw-r--r-- | drivers/idle/intel_idle.c | 4 |
2 files changed, 5 insertions, 0 deletions
diff --git a/arch/x86/include/asm/msr-index.h b/arch/x86/include/asm/msr-index.h index b75eeab..43a18c7 100644 --- a/arch/x86/include/asm/msr-index.h +++ b/arch/x86/include/asm/msr-index.h @@ -39,6 +39,7 @@ #define MSR_NHM_SNB_PKG_CST_CFG_CTL 0x000000e2 #define NHM_C3_AUTO_DEMOTE (1UL << 25) #define NHM_C1_AUTO_DEMOTE (1UL << 26) +#define ATM_LNC_C6_AUTO_DEMOTE (1UL << 25) #define MSR_MTRRcap 0x000000fe #define MSR_IA32_BBL_CR_CTL 0x00000119 diff --git a/drivers/idle/intel_idle.c b/drivers/idle/intel_idle.c index 32b25bc..4a5c4a4 100644 --- a/drivers/idle/intel_idle.c +++ b/drivers/idle/intel_idle.c @@ -345,8 +345,12 @@ static int intel_idle_probe(void) break; case 0x1C: /* 28 - Atom Processor */ + cpuidle_state_table = atom_cstates; + break; + case 0x26: /* 38 - Lincroft Atom Processor */ cpuidle_state_table = atom_cstates; + auto_demotion_disable_flags = ATM_LNC_C6_AUTO_DEMOTE; break; case 0x2A: /* SNB */ |