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-rw-r--r--arch/mips/kernel/cpu-probe.c12
1 files changed, 11 insertions, 1 deletions
diff --git a/arch/mips/kernel/cpu-probe.c b/arch/mips/kernel/cpu-probe.c
index ab755ea26c6..0fc90ba16ae 100644
--- a/arch/mips/kernel/cpu-probe.c
+++ b/arch/mips/kernel/cpu-probe.c
@@ -137,7 +137,6 @@ static inline void check_wait(void)
case CPU_4KEC:
case CPU_4KSC:
case CPU_5KC:
-/* case CPU_20KC:*/
case CPU_24K:
case CPU_25KF:
case CPU_34K:
@@ -156,6 +155,17 @@ static inline void check_wait(void)
if (allow_au1k_wait)
cpu_wait = au1k_wait;
break;
+ case CPU_20KC:
+ /*
+ * WAIT on Rev1.0 has E1, E2, E3 and E16.
+ * WAIT on Rev2.0 and Rev3.0 has E16.
+ * Rev3.1 WAIT is nop, why bother
+ */
+ if ((c->processor_id & 0xff) <= 0x64)
+ break;
+
+ cpu_wait = r4k_wait;
+ break;
case CPU_RM9000:
if ((c->processor_id & 0x00ff) >= 0x40)
cpu_wait = r4k_wait;