On Wednesday 28 March 2007 09:04:28 Thomas Gleixner wrote: > On Tue, 2007-03-27 at 01:46 +0800, Jeff Chua wrote: > > On 3/27/07, Thomas Gleixner <tglx@xxxxxxxxxxxxx> wrote: > > > > > > It's related. I tested without CONFIG_HPET_TIMER, and now my X60 can > > > > suspend and resume from RAM (s2ram). Even better, it works > > > > with/without CONFIG_NO_HZ. > > > > > > Does the patch below fix the HPET_TIMER=y case ? > > > > Thomas, I tried, but it didn't help. Upon resume from ram, "date" > > still didn't advance. > > Can you please issue a SysRq-Q in this situation and provide the dmesg > output ? > > Thanks, > > tglx > > > - > To unsubscribe from this list: send the line "unsubscribe linux-kernel" in > the body of a message to majordomo@xxxxxxxxxxxxxxx > More majordomo info at http://vger.kernel.org/majordomo-info.html > Please read the FAQ at http://www.tux.org/lkml/ > Hi, I almost sure Iknow why this happens, The problem is that both hpet clock source and hpet clockevents doesn't have a suspend/resume function On resume we should enable the main counter _and_ enable legacy replacement mode, On my system main counter in enabled, by I think by bios, but legacy replacement mode is not, so if a system doesn't use lapic as a tick source, but use hpet+broadcast, it will hang for sure on resume, and i tested it The patch below is a temporally fix, until clock-events and clocksources will get proper suspend/resume hooks: Regards, Maxim Levitsky --- Add suspend/resume for HPET Signed-off-by: Maxim Levitsky <maximlevisky@xxxxxxxxx> --- diff --git a/arch/i386/kernel/hpet.c b/arch/i386/kernel/hpet.c index 0fd9fba..a1ec79e 100644 --- a/arch/i386/kernel/hpet.c +++ b/arch/i386/kernel/hpet.c @@ -152,6 +152,16 @@ static void hpet_set_mode(enum clock_event_mode mode, unsigned long cfg, cmp, now; uint64_t delta; + + if ( mode != CLOCK_EVT_MODE_UNUSED && mode != CLOCK_EVT_MODE_SHUTDOWN) + { + unsigned long cfg = hpet_readl(HPET_CFG); + cfg |= HPET_CFG_ENABLE | HPET_CFG_LEGACY; + hpet_writel(cfg, HPET_CFG); + + } + + switch(mode) { case CLOCK_EVT_MODE_PERIODIC: delta = ((uint64_t)(NSEC_PER_SEC/HZ)) * hpet_clockevent.mult; _______________________________________________ linux-pm mailing list linux-pm@xxxxxxxxxxxxxxxxxxxxxxxxxx https://lists.linux-foundation.org/mailman/listinfo/linux-pm
