Messages in this thread Patch in this message | | | Date | Sat, 23 Jun 2007 13:32:39 -0000 | From | Thomas Gleixner <> | Subject | [patch -mm 14/28] i386: PIT stop only, when in periodic or oneshot mode |
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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> --- arch/i386/kernel/i8253.c | 9 ++++++--- 1 file changed, 6 insertions(+), 3 deletions(-)
Index: linux-2.6.22-rc4-mm/arch/i386/kernel/i8253.c =================================================================== --- linux-2.6.22-rc4-mm.orig/arch/i386/kernel/i8253.c 2007-06-23 14:38:58.000000000 +0200 +++ linux-2.6.22-rc4-mm/arch/i386/kernel/i8253.c 2007-06-23 14:38:59.000000000 +0200 @@ -48,9 +48,12 @@ static void init_pit_timer(enum clock_ev 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: --
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