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Commit bfb53ccf authored by Len Brown's avatar Len Brown
Browse files

intel_idle: disable Atom/Lincroft HW C-state auto-demotion 

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: default avatarLen Brown <len.brown@intel.com>
parent 14796fca

arch/x86/include/asm/msr-index.h

+1 −0
Original line number Diff line number Diff line
@@ -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

drivers/idle/intel_idle.c

+4 −0
Original line number Diff line number Diff line
@@ -345,8 +345,12 @@ 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 */