[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>

diff --git a/arch/mips/kernel/cpu-probe.c b/arch/mips/kernel/cpu-probe.c
index 06448a9..3e00416 100644 (file)
--- 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)