Hi Thomas, > On Oct 16, 2019, at 18:38, Kai-Heng Feng <kai.heng.feng@xxxxxxxxxxxxx> wrote: > > Some Coffee Lake platforms have skewed HPET timer once the SoCs entered > PC10, and marked TSC as unstable clocksource as result. > > Harry Pan identified it's a firmware bug [1]. > > To prevent creating a circular dependency between HPET and TSC, let's > disable HPET on affected platforms. > > [1]: https://lore.kernel.org/lkml/20190516090651.1396-1-harry.pan@xxxxxxxxx/ > Bugzilla: https://bugzilla.kernel.org/show_bug.cgi?id=203183 Do you think it's a sane approach? Kai-Heng > > Cc: <stable@xxxxxxxxxxxxxxx> > Suggested-by: Feng Tang <feng.tang@xxxxxxxxx> > Signed-off-by: Kai-Heng Feng <kai.heng.feng@xxxxxxxxxxxxx> > --- > arch/x86/kernel/early-quirks.c | 2 ++ > 1 file changed, 2 insertions(+) > > diff --git a/arch/x86/kernel/early-quirks.c b/arch/x86/kernel/early-quirks.c > index 6f6b1d04dadf..4cba91ec8049 100644 > --- a/arch/x86/kernel/early-quirks.c > +++ b/arch/x86/kernel/early-quirks.c > @@ -710,6 +710,8 @@ static struct chipset early_qrk[] __initdata = { > */ > { PCI_VENDOR_ID_INTEL, 0x0f00, > PCI_CLASS_BRIDGE_HOST, PCI_ANY_ID, 0, force_disable_hpet}, > + { PCI_VENDOR_ID_INTEL, 0x3ec4, > + PCI_CLASS_BRIDGE_HOST, PCI_ANY_ID, 0, force_disable_hpet}, > { PCI_VENDOR_ID_BROADCOM, 0x4331, > PCI_CLASS_NETWORK_OTHER, PCI_ANY_ID, 0, apple_airport_reset}, > {} > -- > 2.17.1 >
