linux-kernel - [14/82] intel_idle: do not use the LAPIC timer for ATOM C2

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Message-Id: <20101119215639.901029025@clark.site>
Date:	Fri, 19 Nov 2010 13:55:35 -0800
From:	Greg KH <gregkh@...e.de>
To:	linux-kernel@...r.kernel.org, stable@...nel.org
Cc:	stable-review@...nel.org, torvalds@...ux-foundation.org,
	akpm@...ux-foundation.org, alan@...rguk.ukuu.org.uk,
	Len Brown <len.brown@...el.com>, Tom Gundersen <teg@...m.no>
Subject: [14/82] intel_idle: do not use the LAPIC timer for ATOM C2

2.6.35-stable review patch.  If anyone has any objections, please let us know.

------------------

From: Len Brown <len.brown@...el.com>

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@...el.com>
Cc: Tom Gundersen <teg@...m.no>
Signed-off-by: Greg Kroah-Hartman <gregkh@...e.de>

---
 drivers/idle/intel_idle.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- 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;


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