diff options
| author | Thomas Gleixner <tglx@linutronix.de> | 2007-07-21 04:37:38 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@woody.linux-foundation.org> | 2007-07-21 17:49:15 -0700 |
| commit | 7671988b9cd31daf53fd38f8e75c8b881324842b (patch) | |
| tree | fc4aa3a4cf61f73ee5c6025aff9959ad005ef3b8 /arch/i386 | |
| parent | 82644459c592a28a3eab682f9b88d81019ddfe8b (diff) | |
i386: PIT stop only, when in periodic or oneshot mode
The patch is necessary on one of my boxen, where programming the stop
sequence twice leads to PIT malfunction.
Sigh !
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: Andi Kleen <ak@suse.de>
Cc: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'arch/i386')
| -rw-r--r-- | arch/i386/kernel/i8253.c | 9 |
1 files changed, 6 insertions, 3 deletions
diff --git a/arch/i386/kernel/i8253.c b/arch/i386/kernel/i8253.c index 931eabe1e56..bde249dda94 100644 --- a/arch/i386/kernel/i8253.c +++ b/arch/i386/kernel/i8253.c @@ -47,9 +47,12 @@ static void init_pit_timer(enum clock_event_mode mode, case CLOCK_EVT_MODE_SHUTDOWN: case CLOCK_EVT_MODE_UNUSED: - outb_p(0x30, PIT_MODE); - outb_p(0, PIT_CH0); /* LSB */ - outb_p(0, PIT_CH0); /* MSB */ + if (evt->mode == CLOCK_EVT_MODE_PERIODIC || + evt->mode == CLOCK_EVT_MODE_ONESHOT) { + outb_p(0x30, PIT_MODE); + outb_p(0, PIT_CH0); + outb_p(0, PIT_CH0); + } break; case CLOCK_EVT_MODE_ONESHOT: |