My Lenovo T490s with i7-8665U had been marking TSC as unstable
since v5.13, resulting in very sluggish desktop experience...

I have a 8086:3e34 bridge, also known as "Host bridge: Intel
Corporation Coffee Lake HOST and DRAM Controller (rev 0c)".
Add it to the list.

We should perhaps consider applying this quirk more widely.
The Intel documentation does not list my device [1], but
linuxhw [2] does, and it seems to list a few more bridges
we do not currently cover (3e31, 3ecc, 3e35, 3e0f).

[1] https://www.intel.com/content/dam/www/public/us/en/documents/datasheets/8th-gen-core-family-datasheet-vol-2.pdf
[2] https://github.com/linuxhw/DevicePopulation/blob/master/README.md

Cc: stable@vger.kernel.org # v5.13+
Signed-off-by: Jakub Kicinski <kuba@kernel.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 38837dad46e6..7d2de04f8750 100644
--- a/arch/x86/kernel/early-quirks.c
+++ b/arch/x86/kernel/early-quirks.c

@@ -716,6 +716,8 @@ static struct chipset early_qrk[] __initdata = {
 		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, 0x3e34,
+		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,

-- 
2.31.1