diff options
| author | Thomas Gleixner <tglx@linutronix.de> | 2007-07-21 07:37:38 -0400 |
|---|---|---|
| committer | Linus Torvalds <torvalds@woody.linux-foundation.org> | 2007-07-21 20:49:15 -0400 |
| commit | 7671988b9cd31daf53fd38f8e75c8b881324842b (patch) | |
| tree | fc4aa3a4cf61f73ee5c6025aff9959ad005ef3b8 /arch/i386/kernel/i8253.c | |
| 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/kernel/i8253.c')
| -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 931eabe1e560..bde249dda94d 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, | |||
| 47 | 47 | ||
| 48 | case CLOCK_EVT_MODE_SHUTDOWN: | 48 | case CLOCK_EVT_MODE_SHUTDOWN: |
| 49 | case CLOCK_EVT_MODE_UNUSED: | 49 | case CLOCK_EVT_MODE_UNUSED: |
| 50 | outb_p(0x30, PIT_MODE); | 50 | if (evt->mode == CLOCK_EVT_MODE_PERIODIC || |
| 51 | outb_p(0, PIT_CH0); /* LSB */ | 51 | evt->mode == CLOCK_EVT_MODE_ONESHOT) { |
| 52 | outb_p(0, PIT_CH0); /* MSB */ | 52 | outb_p(0x30, PIT_MODE); |
| 53 | outb_p(0, PIT_CH0); | ||
| 54 | outb_p(0, PIT_CH0); | ||
| 55 | } | ||
| 53 | break; | 56 | break; |
| 54 | 57 | ||
| 55 | case CLOCK_EVT_MODE_ONESHOT: | 58 | case CLOCK_EVT_MODE_ONESHOT: |