Messages in this thread Patch in this message | | | Subject | Re: [PATCH] Blacklist Dell Optiplex 320 from using the HPET | From | Thomas Gleixner <> | Date | Sat, 05 May 2007 16:26:54 +0200 |
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Guilherme,
On Fri, 2007-05-04 at 16:27 -0700, john stultz wrote: > > Before going to hard to maintain DMI black lists we should first check > > if it's a more general problem and can't it be solved better? Most likely > > that system isn't the one with this issue and I don't want to apply > > DMI patches forever. > > We can give it a whirl, I just didn't want to add yet another "compare > with some other counter that may or may not work" check. In this case, > probably reading three times in a row and getting the same result would > be a clearly broken box.
can you please undo John's patch and check whether the patch below works for you.
Thanks,
tglx
Index: linux-2.6.21/arch/i386/kernel/hpet.c =================================================================== --- linux-2.6.21.orig/arch/i386/kernel/hpet.c +++ linux-2.6.21/arch/i386/kernel/hpet.c @@ -231,6 +231,7 @@ int __init hpet_enable(void) { unsigned long id; uint64_t hpet_freq; + cycle_t t1; u64 tmp; if (!is_hpet_capable()) @@ -278,6 +279,14 @@ int __init hpet_enable(void) /* Start the counter */ hpet_start_counter(); + /* Verify whether hpet counter works */ + t1 = hpet_read(); + udelay(50); + if (t1 == hpet_read()) { + printk(KERN_WARNING "HPET counter is defect\n"); + goto out_nohpet; + } + /* Initialize and register HPET clocksource * * hpet period is in femto seconds per cycle
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