intel_idle: do not use the LAPIC timer for ATOM C2

commit c25d29952b2a8c9aaf00e081c9162a0e383030cd upstream.

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>
Cc: Tom Gundersen <teg@jklm.no>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

diff --git a/drivers/idle/intel_idle.c b/drivers/idle/intel_idle.c
index 54f0fb4cd5d25086701ad23243f97f138a645233..ae48da953834e999855ab4c391f0f45c49e02cfb 100755 (executable)
--- a/drivers/idle/intel_idle.c
+++ b/drivers/idle/intel_idle.c
@@ -308,7 +308,7 @@ static int intel_idle_probe(void)
                break;
 
        case 0x1C:      /* 28 - Atom Processor */
-               lapic_timer_reliable_states = (1 << 2) | (1 << 1); /* C2, C1 */
+               lapic_timer_reliable_states = (1 << 1); /* C1 */
                cpuidle_state_table = atom_cstates;
                choose_substate = choose_zero_substate;
                break;