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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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