linux-kernel - [PATCH AUTOSEL 5.4 016/187] x86/intel: Disable HPET on Intel Ice Lake platforms

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Message-Id: <20191227174055.4923-16-sashal@kernel.org>
Date:   Fri, 27 Dec 2019 12:38:04 -0500
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     Kai-Heng Feng <kai.heng.feng@...onical.com>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Thomas Gleixner <tglx@...utronix.de>, bp@...en8.de,
        feng.tang@...el.com, harry.pan@...el.com, hpa@...or.com,
        Ingo Molnar <mingo@...nel.org>,
        Sasha Levin <sashal@...nel.org>, linux-pci@...r.kernel.org
Subject: [PATCH AUTOSEL 5.4 016/187] x86/intel: Disable HPET on Intel Ice Lake platforms

From: Kai-Heng Feng <kai.heng.feng@...onical.com>

[ Upstream commit e0748539e3d594dd26f0d27a270f14720b22a406 ]

Like CFL and CFL-H, ICL SoC has skewed HPET timer once it hits PC10.
So let's disable HPET on ICL.

Signed-off-by: Kai-Heng Feng <kai.heng.feng@...onical.com>
Cc: Linus Torvalds <torvalds@...ux-foundation.org>
Cc: Peter Zijlstra <peterz@...radead.org>
Cc: Thomas Gleixner <tglx@...utronix.de>
Cc: bp@...en8.de
Cc: feng.tang@...el.com
Cc: harry.pan@...el.com
Cc: hpa@...or.com
Link: https://lkml.kernel.org/r/20191129062303.18982-2-kai.heng.feng@canonical.com
Signed-off-by: Ingo Molnar <mingo@...nel.org>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 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 606711f5ebf8..2f9ec14be3b1 100644
--- a/arch/x86/kernel/early-quirks.c
+++ b/arch/x86/kernel/early-quirks.c
@@ -714,6 +714,8 @@ static struct chipset early_qrk[] __initdata = {
 		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_INTEL, 0x8a12,
+		PCI_CLASS_BRIDGE_HOST, PCI_ANY_ID, 0, force_disable_hpet},
 	{ PCI_VENDOR_ID_BROADCOM, 0x4331,
 	  PCI_CLASS_NETWORK_OTHER, PCI_ANY_ID, 0, apple_airport_reset},
 	{}
-- 
2.20.1