From: Thomas Gleixner Date: Thu, 22 Mar 2007 21:46:18 +0000 (+0100) Subject: [PATCH] i386: clockevents fix breakage on Geode/Cyrix PIT implementations X-Git-Tag: v2.6.21-rc5~47 X-Git-Url: http://pilppa.com/gitweb/?a=commitdiff_plain;h=6b3964cde70cfe6db79d35b42137431ef7d2f7e4;p=linux-2.6-omap-h63xx.git [PATCH] i386: clockevents fix breakage on Geode/Cyrix PIT implementations The PIT has no dedicated mode for shut down. The only way to disable PIT is to put it into one shot mode. AMD implementations of PIT on Geode (also observed on Cyrix) are confused by an "empty" transition from CLOCK_EVT_MODE_UNUSED to CLOCK_EVT_MODE_SHUTDOWN, which puts the PIT into one shot mode momentarily. I realized after staring helpless at the bug report http://bugzilla.kernel.org/show_bug.cgi?id=8027 for quite a while, that the only change, which might influence the bogomips calibration, is the above transition during the PIT initialization. Avoiding the unnecessary switch to oneshot and later to periodic mode fixes the weird bogomips value and also the resulting slowness. The fix is confirmed on OLPC and another Geode based box. Note: this is unrelated to the Dual Core problem discussed here: http://lkml.org/lkml/2007/3/17/48 Signed-off-by: Thomas Gleixner Signed-off-by: Linus Torvalds --- diff --git a/arch/i386/kernel/i8253.c b/arch/i386/kernel/i8253.c index 5cbb776b308..10cef5ca8a5 100644 --- a/arch/i386/kernel/i8253.c +++ b/arch/i386/kernel/i8253.c @@ -47,9 +47,17 @@ static void init_pit_timer(enum clock_event_mode mode, outb(LATCH >> 8 , PIT_CH0); /* MSB */ break; - case CLOCK_EVT_MODE_ONESHOT: + /* + * 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; + case CLOCK_EVT_MODE_ONESHOT: /* One shot setup */ outb_p(0x38, PIT_MODE); udelay(10);