Disable by programming pit directly when performing CLOCK_EVT_MODE_UNUSED
or CLOCK_EVT_MODE_SHUTDOWN transitions. (A variant) tested successfully
by Joachim Deguara on a Geode that exhibited BZ 8027 behaviour (with
bad bogomips).
Signed-off-by: Chris Wright <[email protected]>
Cc: Joachim Deguara <[email protected]>
---
arch/i386/kernel/i8253.c | 25 ++++---------------------
1 file changed, 4 insertions(+), 21 deletions(-)
--- tglx.orig/arch/i386/kernel/i8253.c
+++ tglx/arch/i386/kernel/i8253.c
@@ -29,24 +29,6 @@ EXPORT_SYMBOL(i8253_lock);
*/
struct clock_event_device *global_clock_event;
-/* Status of the PIT interrupt */
-static int pit_irq_disabled;
-
-/*
- * Control pit interrupt enable / disable
- */
-static void pit_control_irq(int disable)
-{
- if (pit_irq_disabled == disable)
- return;
-
- pit_irq_disabled = disable;
- if (disable)
- disable_irq(0);
- else
- enable_irq(0);
-}
-
/*
* Initialize the PIT timer.
*
@@ -65,17 +47,18 @@ static void init_pit_timer(enum clock_ev
outb_p(0x34, PIT_MODE);
outb_p(LATCH & 0xff , PIT_CH0); /* LSB */
outb(LATCH >> 8 , PIT_CH0); /* MSB */
- pit_control_irq(0);
break;
case CLOCK_EVT_MODE_SHUTDOWN:
case CLOCK_EVT_MODE_UNUSED:
- pit_control_irq(1);
+ outb_p(0x30, PIT_MODE);
+ outb_p(0, PIT_CH0); /* LSB */
+ outb_p(0, PIT_CH0); /* MSB */
break;
+
case CLOCK_EVT_MODE_ONESHOT:
/* One shot setup */
outb_p(0x38, PIT_MODE);
- pit_control_irq(0);
break;
case CLOCK_EVT_MODE_RESUME:
-
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