From: Len Brown <len.brown@intel.com>
Date: Sun, 24 Oct 2010 03:25:53 +0000 (-0400)
Subject: intel_idle: do not use the LAPIC timer for ATOM C2
X-Git-Tag: v2.6.37-rc1~101^2
X-Git-Url: https://openfabrics.org/gitweb/?a=commitdiff_plain;h=c25d29952b2a8c9aaf00e081c9162a0e383030cd;p=~emulex%2Finfiniband.git

intel_idle: do not use the LAPIC timer for ATOM C2

If we use the LAPIC timer during ATOM C2 on
some nvidia chisets, the system stalls.

https://bugzilla.kernel.org/show_bug.cgi?id=21032

Signed-off-by: Len Brown <len.brown@intel.com>
---

diff --git a/drivers/idle/intel_idle.c b/drivers/idle/intel_idle.c
index d310590598f..b68d594b843 100644
--- a/drivers/idle/intel_idle.c
+++ b/drivers/idle/intel_idle.c
@@ -302,7 +302,7 @@ static int intel_idle_probe(void)
 
 	case 0x1C:	/* 28 - Atom Processor */
 	case 0x26:	/* 38 - Lincroft Atom Processor */
-		lapic_timer_reliable_states = (1 << 2) | (1 << 1); /* C2, C1 */
+		lapic_timer_reliable_states = (1 << 1); /* C1 */
 		cpuidle_state_table = atom_cstates;
 		break;