The patch titled
i386: HPET, check if the counter works
has been removed from the -mm tree. Its filename was
i386-hpet-check-if-the-counter-works.patch
This patch was dropped because it was merged into mainline or a subsystem tree
------------------------------------------------------
Subject: i386: HPET, check if the counter works
From: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Some systems have a HPET which is not incrementing, which leads to a
complete hang. Detect it during HPET setup.
Signed-off-by: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Cc: Andi Kleen <ak@xxxxxxx>
Cc: john stultz <johnstul@xxxxxxxxxx>
Cc: <stable@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
arch/i386/kernel/hpet.c | 24 +++++++++++++++++++++++-
1 files changed, 23 insertions(+), 1 deletion(-)
diff -puN arch/i386/kernel/hpet.c~i386-hpet-check-if-the-counter-works arch/i386/kernel/hpet.c
--- a/arch/i386/kernel/hpet.c~i386-hpet-check-if-the-counter-works
+++ a/arch/i386/kernel/hpet.c
@@ -226,7 +226,8 @@ int __init hpet_enable(void)
{
unsigned long id;
uint64_t hpet_freq;
- u64 tmp;
+ u64 tmp, start, now;
+ cycle_t t1;
if (!is_hpet_capable())
return 0;
@@ -273,6 +274,27 @@ int __init hpet_enable(void)
/* Start the counter */
hpet_start_counter();
+ /* Verify whether hpet counter works */
+ t1 = read_hpet();
+ rdtscll(start);
+
+ /*
+ * We don't know the TSC frequency yet, but waiting for
+ * 200000 TSC cycles is safe:
+ * 4 GHz == 50us
+ * 1 GHz == 200us
+ */
+ do {
+ rep_nop();
+ rdtscll(now);
+ } while ((now - start) < 200000UL);
+
+ if (t1 == read_hpet()) {
+ printk(KERN_WARNING
+ "HPET counter not counting. HPET disabled\n");
+ goto out_nohpet;
+ }
+
/* Initialize and register HPET clocksource
*
* hpet period is in femto seconds per cycle
_
Patches currently in -mm which might be from tglx@xxxxxxxxxxxxx are
origin.patch
git-acpi.patch
acpi-move-timer-broadcast-and-pmtimer-access-before-c3-arbiter-shutdown.patch
nohz-fix-nohz-x86-dyntick-idle-handling.patch
clockevents-remove-prototypes-of-removed-functions.patch
clockevents-fix-resume-logic.patch
lguest-the-host-code-lguest-vs-clockevents-fix-resume-logic.patch
clockevents-fix-device-replacement.patch
tick-management-spread-timer-interrupt.patch
highres-improve-debug-output.patch
hrtimer-speedup-hrtimer_enqueue.patch
ntp-move-the-cmos-update-code-into-ntpc.patch
i386-pit-stop-only-when-in-periodic-or-oneshot-mode.patch
acpi-remove-the-useless-ifdef-code.patch
x86_64-hpet-restore-vread.patch
x86_64-restore-restore-nohpet-cmdline.patch
x86_64-block-irq-balancing-for-timer.patch
x86_64-prep-idle-loop-for-dynticks.patch
x86_64-enable-high-resolution-timers-and-dynticks.patch
x86_64-dynticks-disable-hpet_id_legsup-hpets.patch
geode-mfgpt-clock-event-device-support.patch
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