This is a note to let you know that I've just added the patch titled
intel_idle: disable Atom/Lincroft HW C-state auto-demotion
to the 2.6.37-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
intel_idle-disable-atom-lincroft-hw-c-state-auto-demotion.patch
and it can be found in the queue-2.6.37 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <[email protected]> know about it.
>From bfb53ccf1c734b1907df7189eef4c08489827951 Mon Sep 17 00:00:00 2001
From: Len Brown <[email protected]>
Date: Wed, 16 Feb 2011 01:32:48 -0500
Subject: intel_idle: disable Atom/Lincroft HW C-state auto-demotion
From: Len Brown <[email protected]>
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 <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>
---
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 */
Patches currently in stable-queue which might be from [email protected] are
queue-2.6.37/intel_idle-disable-atom-lincroft-hw-c-state-auto-demotion.patch
queue-2.6.37/intel_idle-disable-nhm-wsm-hw-c-state-auto-demotion.patch
_______________________________________________
stable mailing list
[email protected]
http://linux.kernel.org/mailman/listinfo/stable
