From: Len Brown <[email protected]> upstream bfb53ccf1c734b1907df7189eef4c08489827951
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]> --- arch/x86/include/asm/msr-index.h | 1 + drivers/idle/intel_idle.c | 4 ++++ 2 files changed, 5 insertions(+), 0 deletions(-) Index: linux-2.6.37.y/arch/x86/include/asm/msr-index.h =================================================================== --- linux-2.6.37.y.orig/arch/x86/include/asm/msr-index.h +++ linux-2.6.37.y/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 Index: linux-2.6.37.y/drivers/idle/intel_idle.c =================================================================== --- linux-2.6.37.y.orig/drivers/idle/intel_idle.c +++ linux-2.6.37.y/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 */ _______________________________________________ stable mailing list [email protected] http://linux.kernel.org/mailman/listinfo/stable
