[PATCH] platform/x86/amd/pmc: Add LG Ultra PC 16U70Q to quirks list

[Carlos Baiget Orts via B4 Relay]

From: Carlos Baiget Orts <asinfreedom@xxxxxxxxx>

The LG Ultra PC 16U70Q (Ryzen 7 5825U) spends ~5 seconds in the noirq
resume phase on every s2idle resume. This is the same NVMe SMI handler
issue seen on other Cezanne systems. Skipping it with s2idle_bug_mmio
brings it down to ~32 ms.

As on the other Cezanne systems, the entry must also keep the spurious
IRQ1 (8042) wakeup workaround. Otherwise the system wakes up immediately
from s2idle, so use quirk_s2idle_spurious_8042.

Link: https://gitlab.freedesktop.org/drm/amd/-/issues/6021
Cc: Mario Limonciello <mario.limonciello@xxxxxxx>
Assisted-by: Claude:claude-opus-5-5
Signed-off-by: Carlos Baiget Orts <asinfreedom@xxxxxxxxx>
---
Tested on the 16U70Q (BIOS L2UG0160) with a locally built amd_pmc
carrying this entry: noirq resume drops from ~5.2 s to ~32 ms, and
s2idle no longer wakes up immediately from spurious IRQ1 events.
---
 drivers/platform/x86/amd/pmc/pmc-quirks.c | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/drivers/platform/x86/amd/pmc/pmc-quirks.c b/drivers/platform/x86/amd/pmc/pmc-quirks.c
index fed6c51879..ca188d815c 100644
--- a/drivers/platform/x86/amd/pmc/pmc-quirks.c
+++ b/drivers/platform/x86/amd/pmc/pmc-quirks.c
@@ -386,6 +386,15 @@ static const struct dmi_system_id fwbug_list[] = {
 			DMI_MATCH(DMI_BOARD_NAME, "WUJIE Series-X5SP4NAG"),
 		}
 	},
+	/* https://gitlab.freedesktop.org/drm/amd/-/issues/6021 */
+	{
+		.ident = "LG Ultra PC 16U70Q",
+		.driver_data = &quirk_s2idle_spurious_8042,
+		.matches = {
+			DMI_MATCH(DMI_SYS_VENDOR, "LG Electronics"),
+			DMI_MATCH(DMI_PRODUCT_NAME, "16U70Q"),
+		}
+	},
 	{}
 };
 

---
base-commit: c339f4010dea8b0d754f84ace70cd1b089878ef8
change-id: 20261029-lg-16u70q-quirk-fae864db4054

Best regards,
-- 
Carlos Baiget Orts <asinfreedom@xxxxxxxxx>