On Mon, 11 Oct 2021 15:46:20 +0200 Greg Kroah-Hartman wrote: > From: Thomas Gleixner <tglx@xxxxxxxxxxxxx> > > commit 6e3cd95234dc1eda488f4f487c281bac8fef4d9b upstream. > > On recent Intel systems the HPET stops working when the system reaches PC10 > idle state. > > The approach of adding PCI ids to the early quirks to disable HPET on > these systems is a whack a mole game which makes no sense. > > Check for PC10 instead and force disable HPET if supported. The check is > overbroad as it does not take ACPI, intel_idle enablement and command > line parameters into account. That's fine as long as there is at least > PMTIMER available to calibrate the TSC frequency. The decision can be > overruled by adding "hpet=force" on the kernel command line. > > Remove the related early PCI quirks for affected Ice Cake and Coffin Lake > systems as they are not longer required. That should also cover all > other systems, i.e. Tiger Rag and newer generations, which are most > likely affected by this as well. > > Fixes: Yet another hardware trainwreck > Reported-by: Jakub Kicinski <kuba@xxxxxxxxxx> > Signed-off-by: Thomas Gleixner <tglx@xxxxxxxxxxxxx> > Tested-by: Jakub Kicinski <kuba@xxxxxxxxxx> > Reviewed-by: Rafael J. Wysocki <rafael@xxxxxxxxxx> > Cc: stable@xxxxxxxxxxxxxxx > Cc: Kai-Heng Feng <kai.heng.feng@xxxxxxxxxxxxx> > Cc: Bjorn Helgaas <bhelgaas@xxxxxxxxxx> > Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> FWIW I've never seen any problems prior to Paul's rework of bad clock detection in 5.13. Backports to 5.4 and 5.10 are not necessary.
