[PATCH] x86: add the X86_FEATURE_NONSTOP_TSC_S3 cpu capability to new cpu

[PATCH] x86: add the X86_FEATURE_NONSTOP_TSC_S3 cpu capability to new cpu

[Compostella, Jeremy]

New Intel Atom processors (Baytrail and Cherryview), have a TSC that won't stop
in S3 state, say the TSC value won't be reset to 0 after resume.  This feature
makes TSC a more reliable clocksource and could benefit the timekeeping code
during system suspend/resume cycle.

Signed-off-by: Jeremy Compostella <jeremy.compostella@intel.com>
---
 arch/x86/kernel/cpu/intel.c | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/arch/x86/kernel/cpu/intel.c b/arch/x86/kernel/cpu/intel.c
index 1ef4562..8af195e 100644
--- a/arch/x86/kernel/cpu/intel.c
+++ b/arch/x86/kernel/cpu/intel.c
@@ -92,11 +92,16 @@ static void early_init_intel(struct cpuinfo_x86 *c)
 			set_sched_clock_stable();
 	}
 
-	/* Penwell and Cloverview have the TSC which doesn't sleep on S3 */
+	/*
+	 * Penwell, Cloverview, Valleyview and Cherryview have the TSC
+	 * which doesn't sleep on S3.
+	 */
 	if (c->x86 == 6) {
 		switch (c->x86_model) {
 		case 0x27:	/* Penwell */
 		case 0x35:	/* Cloverview */
+		case 0x37:	/* Valleyview */
+		case 0x4C:	/* Cherryview */
 			set_cpu_cap(c, X86_FEATURE_NONSTOP_TSC_S3);
 			break;
 		default:
-- 
1.9.1