Messages in this thread Patch in this message | | | Date | Fri, 25 Mar 2011 16:47:12 -0700 | From | Greg KH <> | Subject | [19/55] intel_idle: disable Atom/Lincroft HW C-state auto-demotion |
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2.6.37-stable review patch. If anyone has any objections, please let us know.
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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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