On Thu, 29 Aug 2019, Kai-Heng Feng wrote: > Some Coffee Lake platforms have skewed HPET timer once the SoCs entered > PC10, and marked TSC as unstable clocksource as result.
So here you talk about Coffee Lake and in the patch you use KABYLAKE. > 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/[email protected]/ > Bugzilla: https://bugzilla.kernel.org/show_bug.cgi?id=203183 Please use Link:// for reference not [1] and not Bugzilla: > +static const struct x86_cpu_id hpet_blacklist[] __initconst = { > + { X86_VENDOR_INTEL, 6, INTEL_FAM6_KABYLAKE_MOBILE }, > + { X86_VENDOR_INTEL, 6, INTEL_FAM6_KABYLAKE_DESKTOP }, So this disables HPET on all Kaby Lake variants not just on the affected Coffee Lakes. I know that I rejected the initial patch with the random stepping cutoff... https://lore.kernel.org/lkml/[email protected] In the other attempt to 'fix' this I asked for clarification, but silence from Intel after this: https://lore.kernel.org/lkml/[email protected] Can Intel please provide some useful information about this finally? Thanks, tglx
