Messages in this thread | | | Date | Fri, 28 Mar 2014 09:11:17 +0100 | From | Ingo Molnar <> | Subject | Re: [PATCH v2] x86: hpet: Don't default CONFIG_HPET_TIMER to be y for X86_64 |
| |
* Clemens Ladisch <clemens@ladisch.de> wrote:
> Feng Tang wrote: > > On Fri, Mar 28, 2014 at 08:17:16AM +0100, Ingo Molnar wrote: > >> * Feng Tang <feng.tang@intel.com> wrote: > >> - or the kernel should have a quirk to reliably disable it. Why > >> should we crash or misbehave if a driver is built into the > >> kernel? > > > > I thought about this before, HPET doesn't have PCI ID like stuff, > > HPET does have the PCI vendor ID in the first register. > > > only thing I can think of to identify them may be the CPU family/ID. > > The HPET is implemented by some actual chip, and that chip also has lots > of PCI devices. (In the case of a SoC, the CPU ID would work, too).
Correct. See arch/x86/kernel/hpet.c, which has a large number of HPET quirks keyed off chipset PCI IDs:
DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_ESB2_0, ich_force_enable_hpet); DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_ICH6_0, ich_force_enable_hpet); DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_ICH6_1, ich_force_enable_hpet); [...]
Thanks,
Ingo
| |