ACPI: Add quirk for Surface Laptop 4 AMD missing irq 7 override

This patch is the work of Thomas Gleixner <tglx@linutronix.de> and is copied from: https://lore.kernel.org/lkml/87lf8ddjqx.ffs@nanos.tec.linutronix.de/ This patch adds a quirk to the ACPI setup to patch in the the irq 7 pin setup that is missing in the laptops ACPI table. This patch was used for validation of the issue, and is not a proper fix, but is probably a better temporary hack than continuing to probe the Legacy PIC and run with the PIC in an unknown state. Patchset: amd-gpio
linux-surface · Sep 5, 2021 · 25baf27 · 25baf27
1 parent 9bf831f
commit 25baf27
Showing 1 changed file with 17 additions and 0 deletions.
diff --git a/arch/x86/kernel/acpi/boot.c b/arch/x86/kernel/acpi/boot.c
@@ -22,6 +22,7 @@
 #include <linux/efi-bgrt.h>
 #include <linux/serial_core.h>
 #include <linux/pgtable.h>
+#include <linux/dmi.h>
 
 #include <asm/e820/api.h>
 #include <asm/irqdomain.h>
@@ -1143,6 +1144,17 @@ static void __init mp_config_acpi_legacy_irqs(void)
 	}
 }
 
+static const struct dmi_system_id surface_quirk[] __initconst = {
+	{
+		.ident = "Microsoft Surface Laptop 4 (AMD)",
+		.matches = {
+			DMI_MATCH(DMI_SYS_VENDOR, "Microsoft Corporation"),
+			DMI_MATCH(DMI_PRODUCT_SKU, "Surface_Laptop_4_1952:1953")
+		},
+	},
+	{}
+};
+
 /*
  * Parse IOAPIC related entries in MADT
  * returns 0 on success, < 0 on error
@@ -1198,6 +1210,11 @@ static int __init acpi_parse_madt_ioapic_entries(void)
 		acpi_sci_ioapic_setup(acpi_gbl_FADT.sci_interrupt, 0, 0,
 				      acpi_gbl_FADT.sci_interrupt);
 
+	if (dmi_check_system(surface_quirk)) {
+		pr_warn("Surface hack: Override irq 7\n");
+		mp_override_legacy_irq(7, 3, 3, 7);
+	}
+
 	/* Fill in identity legacy mappings where no override */
 	mp_config_acpi_legacy_irqs();