[MIPS] 20Kc: Disable use of WAIT instruction.

Another issue with 20Kc's WAIT, waiting for more details.  With the
2.6.23 release immindent simply disable the use of WAIT instead of a
more fancy workaround.

Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

1 files changed, 8 insertions, 1 deletions

diff --git a/arch/mips/kernel/cpu-probe.c b/arch/mips/kernel/cpu-probe.c
index 06448a9656dc..3e004161ebd5 100644
--- a/arch/mips/kernel/cpu-probe.c
+++ b/arch/mips/kernel/cpu-probe.c
@@ -199,7 +199,14 @@ static inline void check_wait(void)
                 if ((c->processor_id & 0xff) <= 0x64)
                         break;
 
-                cpu_wait = r4k_wait;
+                /*
+                 * Another rev is incremeting c0_count at a reduced clock
+                 * rate while in WAIT mode.  So we basically have the choice
+                 * between using the cp0 timer as clocksource or avoiding
+                 * the WAIT instruction.  Until more details are known,
+                 * disable the use of WAIT for 20Kc entirely.
+                   cpu_wait = r4k_wait;
+                 */
                 break;
         case CPU_RM9000:
                 if ((c->processor_id & 0x00ff) >= 0x40)