[MIPS] Sibyte: Increase minimum oneshot timer interval to two ticks.

For the old minimum of a single tick a value of zero would be programmed
into the init value register which in the BCM1250/BCM1125/BCM1125H User
Manual in the Timer Special Cases section is documented to have
UNPREDICTABLE effect.

Observable sympthoms of this bug were hangs of several seconds on the
console during bootup and later if both dyntick and highres timer options
were activated.

In theory contiguous mode of the timers is also affected but in an act of
hopeless lack of realism I'll assume nobody will ever configure a KERNEL
for HZ > 500kHz but if so I leave that to evolution to sort out.

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

2 files changed, 2 insertions, 2 deletions

diff --git a/arch/mips/kernel/cevt-bcm1480.c b/arch/mips/kernel/cevt-bcm1480.c
index f6fcc62ade3a..e54410e5a2cd 100644
--- a/arch/mips/kernel/cevt-bcm1480.c
+++ b/arch/mips/kernel/cevt-bcm1480.c
@@ -122,7 +122,7 @@ void __cpuinit sb1480_clockevent_init(void)
                                   CLOCK_EVT_FEAT_ONESHOT;
         clockevent_set_clock(cd, V_SCD_TIMER_FREQ);
         cd->max_delta_ns        = clockevent_delta2ns(0x7fffff, cd);
-        cd->min_delta_ns        = clockevent_delta2ns(1, cd);
+        cd->min_delta_ns        = clockevent_delta2ns(2, cd);
         cd->rating              = 200;
         cd->irq                 = irq;
         cd->cpumask             = cpumask_of_cpu(cpu);
diff --git a/arch/mips/kernel/cevt-sb1250.c b/arch/mips/kernel/cevt-sb1250.c
index 194e0f726fe8..8fbb05537680 100644
--- a/arch/mips/kernel/cevt-sb1250.c
+++ b/arch/mips/kernel/cevt-sb1250.c
@@ -121,7 +121,7 @@ void __cpuinit sb1250_clockevent_init(void)
                                   CLOCK_EVT_FEAT_ONESHOT;
         clockevent_set_clock(cd, V_SCD_TIMER_FREQ);
         cd->max_delta_ns        = clockevent_delta2ns(0x7fffff, cd);
-        cd->min_delta_ns        = clockevent_delta2ns(1, cd);
+        cd->min_delta_ns        = clockevent_delta2ns(2, cd);
         cd->rating              = 200;
         cd->irq                 = irq;
         cd->cpumask             = cpumask_of_cpu(cpu);