This is a note to let you know that I've just added the patch titled
ACPI: resource: skip IRQ override on AMD Zen platforms
to the 5.15-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:
acpi-resource-skip-irq-override-on-amd-zen-platforms.patch
and it can be found in the queue-5.15 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 9946e39fe8d0a5da9eb947d8e40a7ef204ba016e Mon Sep 17 00:00:00 2001
From: Chuanhong Guo <gch981213@xxxxxxxxx>
Date: Tue, 12 Jul 2022 10:00:58 +0800
Subject: ACPI: resource: skip IRQ override on AMD Zen platforms
From: Chuanhong Guo <gch981213@xxxxxxxxx>
commit 9946e39fe8d0a5da9eb947d8e40a7ef204ba016e upstream.
IRQ override isn't needed on modern AMD Zen systems.
There's an active low keyboard IRQ on AMD Ryzen 6000 and it will stay
this way on newer platforms. This IRQ override breaks keyboards for
almost all Ryzen 6000 laptops currently on the market.
Skip this IRQ override for all AMD Zen platforms because this IRQ
override is supposed to be a workaround for buggy ACPI DSDT and we can't
have a long list of all future AMD CPUs/Laptops in the kernel code.
If a device with buggy ACPI DSDT shows up, a separated list containing
just them should be created.
Link: https://bugzilla.kernel.org/show_bug.cgi?id=216118
Suggested-by: Mario Limonciello <mario.limonciello@xxxxxxx>
Signed-off-by: Chuanhong Guo <gch981213@xxxxxxxxx>
Acked-by: Mario Limonciello <mario.limonciello@xxxxxxx>
Tested-by: XiaoYan Li <lxy.lixiaoyan@xxxxxxxxx>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@xxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/acpi/resource.c | 10 ++++++++++
1 file changed, 10 insertions(+)
--- a/drivers/acpi/resource.c
+++ b/drivers/acpi/resource.c
@@ -416,6 +416,16 @@ static bool acpi_dev_irq_override(u32 gs
{
int i;
+#ifdef CONFIG_X86
+ /*
+ * IRQ override isn't needed on modern AMD Zen systems and
+ * this override breaks active low IRQs on AMD Ryzen 6000 and
+ * newer systems. Skip it.
+ */
+ if (boot_cpu_has(X86_FEATURE_ZEN))
+ return false;
+#endif
+
for (i = 0; i < ARRAY_SIZE(skip_override_table); i++) {
const struct irq_override_cmp *entry = &skip_override_table[i];
Patches currently in stable-queue which might be from gch981213@xxxxxxxxx are
queue-5.15/acpi-resource-skip-irq-override-on-amd-zen-platforms.patch
