diff options
| author | Thomas Gleixner <tglx@linutronix.de> | 2007-07-21 04:37:34 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@woody.linux-foundation.org> | 2007-07-21 17:49:15 -0700 |
| commit | 18de5bc4c1f1f1fa5e14f354a7603bd6e9d4e3b6 (patch) | |
| tree | cb0ff399fb3f368adecf213318e32a499ada6ff9 /arch/i386/kernel/i8253.c | |
| parent | 93da56efcf8c6a111f0349f6b7651172d4745ca0 (diff) | |
| download | lwn-18de5bc4c1f1f1fa5e14f354a7603bd6e9d4e3b6.tar.gz lwn-18de5bc4c1f1f1fa5e14f354a7603bd6e9d4e3b6.zip | |
clockevents: fix resume logic
We need to make sure, that the clockevent devices are resumed, before
the tick is resumed. The current resume logic does not guarantee this.
Add CLOCK_EVT_MODE_RESUME and call the set mode functions of the clock
event devices before resuming the tick / oneshot functionality.
Fixup the existing users.
Thanks to Nigel Cunningham for tracking down a long standing thinko,
which affected the jinxed VAIO.
[akpm@linux-foundation.org: xen build fix]
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: john stultz <johnstul@us.ibm.com>
Cc: Rusty Russell <rusty@rustcorp.com.au>
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 | 26 |
1 files changed, 12 insertions, 14 deletions
diff --git a/arch/i386/kernel/i8253.c b/arch/i386/kernel/i8253.c index f8a3c4054c70..931eabe1e560 100644 --- a/arch/i386/kernel/i8253.c +++ b/arch/i386/kernel/i8253.c @@ -3,11 +3,11 @@ * */ #include <linux/clockchips.h> -#include <linux/spinlock.h> +#include <linux/init.h> +#include <linux/interrupt.h> #include <linux/jiffies.h> -#include <linux/sysdev.h> #include <linux/module.h> -#include <linux/init.h> +#include <linux/spinlock.h> #include <asm/smp.h> #include <asm/delay.h> @@ -41,26 +41,24 @@ static void init_pit_timer(enum clock_event_mode mode, case CLOCK_EVT_MODE_PERIODIC: /* binary, mode 2, LSB/MSB, ch 0 */ outb_p(0x34, PIT_MODE); - udelay(10); outb_p(LATCH & 0xff , PIT_CH0); /* LSB */ - udelay(10); outb(LATCH >> 8 , PIT_CH0); /* MSB */ break; - /* - * Avoid unnecessary state transitions, as it confuses - * Geode / Cyrix based boxen. - */ case CLOCK_EVT_MODE_SHUTDOWN: - if (evt->mode == CLOCK_EVT_MODE_UNUSED) - break; case CLOCK_EVT_MODE_UNUSED: - if (evt->mode == CLOCK_EVT_MODE_SHUTDOWN) - break; + 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); - udelay(10); + break; + + case CLOCK_EVT_MODE_RESUME: + /* Nothing to do here */ break; } spin_unlock_irqrestore(&i8253_lock, flags); |