Re: 2.6.21-rc7: HPET enabled freeze my machine at boot

["Guilherme M. Schroeder" <guilherme@centralinf.com.br>]

John,

Removing the three lines doesn't help too. It just boot ok with 
clocksource=acpi_pm.

Guilherme M. Schroeder
Network Administrator
Central de Vendas Informatica LTDA
Tel.: (11) 3665-2000 Ramal: 2008
http://www.centralinf.com.br


john stultz wrote:
> On Mon, 2007-04-23 at 15:30 -0700, john stultz wrote:
> > On Sat, 2007-04-21 at 20:07 -0300, Guilherme M. Schroeder wrote:
> > > john stultz wrote:
> > > > On 4/19/07, guilherme <guilherme@centralinf.com.br> wrote:
> > > > > Hi,
> > > > >
> > > > > If i enable "High Resolution Timer Support", my machine stops here at 
> > > > > boot:
> > > > >
> > > > > Clocksource tsc unstable (delta = -297340790165 ns)
> > > > > Time: hpet clocksource has been installed.
> > > > >
> > > > > If i disable HPET, it boots fine.
> > > > Hmmm.. What happens if you boot w/ clocksource=acpi_pm ?
> > > Boot ok with clocksource=acpi_pm and HPET enabled.
> > > Any clue?
> >
> > I'm suspecting that your HPET counter is being stopped for some reason,
> > although why I have no idea.
> >
> > Just to get a clear picture, does this happen w/ "Tickless System
> > (Dynamic ticks)" disabled in the menuconfig?
> >
> > Thomas, might we be actually stopping the HPET counter instead of
> > disabling the HPET interrupt w/ dynticks?
>
>
> Just a shot in the dark, but does this patch affect the behavior?
>
> thanks
> -john
>
> diff --git a/arch/i386/kernel/hpet.c b/arch/i386/kernel/hpet.c
> index 17d7345..14e76a5 100644
> --- a/arch/i386/kernel/hpet.c
> +++ b/arch/i386/kernel/hpet.c
> @@ -183,9 +183,6 @@ static void hpet_set_mode(enum clock_event_mode mode,
>  
>  	case CLOCK_EVT_MODE_UNUSED:
>  	case CLOCK_EVT_MODE_SHUTDOWN:
> -		cfg = hpet_readl(HPET_T0_CFG);
> -		cfg &= ~HPET_TN_ENABLE;
> -		hpet_writel(cfg, HPET_T0_CFG);
>  		break;
>  	}
>  }
-
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