This is a note to let you know that I've just added the patch titled x86/intel: Disable HPET on Intel Coffee Lake H platforms to the 5.4-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary The filename of the patch is: x86-intel-disable-hpet-on-intel-coffee-lake-h-platforms.patch and it can be found in the queue-5.4 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let <stable@xxxxxxxxxxxxxxx> know about it. >From f8edbde885bbcab6a2b4a1b5ca614e6ccb807577 Mon Sep 17 00:00:00 2001 From: Kai-Heng Feng <kai.heng.feng@xxxxxxxxxxxxx> Date: Fri, 29 Nov 2019 14:23:02 +0800 Subject: x86/intel: Disable HPET on Intel Coffee Lake H platforms From: Kai-Heng Feng <kai.heng.feng@xxxxxxxxxxxxx> commit f8edbde885bbcab6a2b4a1b5ca614e6ccb807577 upstream. Coffee Lake H SoC has similar behavior as Coffee Lake, skewed HPET timer once the SoCs entered PC10. So let's disable HPET on CFL-H platforms. Signed-off-by: Kai-Heng Feng <kai.heng.feng@xxxxxxxxxxxxx> Cc: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx> Cc: Peter Zijlstra <peterz@xxxxxxxxxxxxx> Cc: Thomas Gleixner <tglx@xxxxxxxxxxxxx> Cc: bp@xxxxxxxxx Cc: feng.tang@xxxxxxxxx Cc: harry.pan@xxxxxxxxx Cc: hpa@xxxxxxxxx Link: https://lkml.kernel.org/r/20191129062303.18982-1-kai.heng.feng@xxxxxxxxxxxxx Signed-off-by: Ingo Molnar <mingo@xxxxxxxxxx> Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> --- arch/x86/kernel/early-quirks.c | 2 ++ 1 file changed, 2 insertions(+) --- a/arch/x86/kernel/early-quirks.c +++ b/arch/x86/kernel/early-quirks.c @@ -710,6 +710,8 @@ static struct chipset early_qrk[] __init */ { PCI_VENDOR_ID_INTEL, 0x0f00, PCI_CLASS_BRIDGE_HOST, PCI_ANY_ID, 0, force_disable_hpet}, + { PCI_VENDOR_ID_INTEL, 0x3e20, + 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, Patches currently in stable-queue which might be from kai.heng.feng@xxxxxxxxxxxxx are queue-5.4/x86-intel-disable-hpet-on-intel-coffee-lake-h-platforms.patch