linux-kernel - [PATCH 5.15 02/35] ACPI: resource: skip IRQ override on AMD Zen platforms

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Message-Id: <20220916100447.037928911@linuxfoundation.org>
Date:   Fri, 16 Sep 2022 12:08:25 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org,
        Mario Limonciello <mario.limonciello@....com>,
        Chuanhong Guo <gch981213@...il.com>,
        XiaoYan Li <lxy.lixiaoyan@...il.com>,
        "Rafael J. Wysocki" <rafael.j.wysocki@...el.com>
Subject: [PATCH 5.15 02/35] ACPI: resource: skip IRQ override on AMD Zen platforms

From: Chuanhong Guo <gch981213@...il.com>

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@....com>
Signed-off-by: Chuanhong Guo <gch981213@...il.com>
Acked-by: Mario Limonciello <mario.limonciello@....com>
Tested-by: XiaoYan Li <lxy.lixiaoyan@...il.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@...el.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 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];