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Subject[19/55] intel_idle: disable Atom/Lincroft HW C-state auto-demotion
2.6.37-stable review patch.  If anyone has any objections, please let us know.

------------------

From: Len Brown <len.brown@intel.com>

commit bfb53ccf1c734b1907df7189eef4c08489827951 upstream.

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>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

---
arch/x86/include/asm/msr-index.h | 1 +
drivers/idle/intel_idle.c | 4 ++++
2 files changed, 5 insertions(+)

--- 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
--- a/drivers/idle/intel_idle.c
+++ b/drivers/idle/intel_idle.c
@@ -340,8 +340,12 @@ 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 */



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