linux-kernel - [PATCH 1/2] x86/intel: Disable HPET on Intel Coffee Lake H platforms

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Message-Id: <20191129062303.18982-1-kai.heng.feng@canonical.com>
Date:   Fri, 29 Nov 2019 14:23:02 +0800
From:   Kai-Heng Feng <kai.heng.feng@...onical.com>
To:     tglx@...utronix.de, mingo@...hat.com, bp@...en8.de
Cc:     hpa@...or.com, harry.pan@...el.com, feng.tang@...el.com,
        x86@...nel.org, linux-kernel@...r.kernel.org,
        Kai-Heng Feng <kai.heng.feng@...onical.com>
Subject: [PATCH 1/2] x86/intel: Disable HPET on Intel Coffee Lake H platforms

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@...onical.com>
---
 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 4cba91ec8049..606711f5ebf8 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, 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,
-- 
2.17.1