2 files changed, 23 insertions, 0 deletions

diff --git a/arch/i386/kernel/tsc.c b/arch/i386/kernel/tsc.c
index 22931d24027c..3082a418635c 100644
--- a/arch/i386/kernel/tsc.c
+++ b/arch/i386/kernel/tsc.c
@@ -364,6 +364,25 @@ __cpuinit int unsynchronized_tsc(void)
         return tsc_unstable;
 }
 
+/*
+ * Geode_LX - the OLPC CPU has a possibly a very reliable TSC
+ */
+#ifdef CONFIG_MGEODE_LX
+/* RTSC counts during suspend */
+#define RTSC_SUSP 0x100
+
+static void __init check_geode_tsc_reliable(void)
+{
+        unsigned long val;
+
+        rdmsrl(MSR_GEODE_BUSCONT_CONF0, val);
+        if ((val & RTSC_SUSP))
+                clocksource_tsc.flags &= ~CLOCK_SOURCE_MUST_VERIFY;
+}
+#else
+static inline void check_geode_tsc_reliable(void) { }
+#endif
+
 static int __init init_tsc_clocksource(void)
 {
 
@@ -372,6 +391,7 @@ static int __init init_tsc_clocksource(void)
                 dmi_check_system(bad_tsc_dmi_table);
 
                 unsynchronized_tsc();
+                check_geode_tsc_reliable();
                 current_tsc_khz = tsc_khz;
                 clocksource_tsc.mult = clocksource_khz2mult(current_tsc_khz,
                                                         clocksource_tsc.shift);
diff --git a/include/asm-i386/msr.h b/include/asm-i386/msr.h
index 609a3899475c..6db40d0583f1 100644
--- a/include/asm-i386/msr.h
+++ b/include/asm-i386/msr.h
@@ -307,4 +307,7 @@ static inline void wrmsrl (unsigned long msr, unsigned long long val)
 #define MSR_CORE_PERF_GLOBAL_CTRL       0x38f
 #define MSR_CORE_PERF_GLOBAL_OVF_CTRL   0x390
 
+/* Geode defined MSRs */
+#define MSR_GEODE_BUSCONT_CONF0         0x1900
+
 #endif /* __ASM_MSR_H */