[S] Change in coreboot[main]: soc/intel/alderlake: Add IRQ mapping for PEG PCI-E ports

[Sean Rhodes (Code Review)]

Sean Rhodes has submitted this change. ( https://review.coreboot.org/c/coreboot/+/84620?usp=email )

Change subject: soc/intel/alderlake: Add IRQ mapping for PEG PCI-E ports
......................................................................

soc/intel/alderlake: Add IRQ mapping for PEG PCI-E ports

ACPI _PRT method was missing from PEG (SoC PCI-E) links, resulting in
OS complaining about interrupt routing:
    pcieport 0000:00:06.0: can't derive routing for PCI INT A

Tested on `starbook_adl` with Ubuntu 24.04 by running SSD
benchmark with GNOME disks and suspend.

Change-Id: I2e36cee37716d3b003b9ce250f28fdf5581a15bc
Signed-off-by: Sean Rhodes 
Reviewed-on: https://review.coreboot.org/c/coreboot/+/84620
Tested-by: build bot (Jenkins) 
Reviewed-by: Kapil Porwal 
Reviewed-by: Jérémy Compostella 
---
M src/soc/intel/alderlake/acpi/pcie.asl
M src/soc/intel/alderlake/acpi/pcie_pch_s.asl
2 files changed, 48 insertions(+), 0 deletions(-)

Approvals:
  Kapil Porwal: Looks good to me, but someone else must approve
  build bot (Jenkins): Verified
  Jérémy Compostella: Looks good to me, approved

diff --git a/src/soc/intel/alderlake/acpi/pcie.asl b/src/soc/intel/alderlake/acpi/pcie.asl
index f37c168..50d9464 100644
--- a/src/soc/intel/alderlake/acpi/pcie.asl
+++ b/src/soc/intel/alderlake/acpi/pcie.asl
@@ -309,16 +309,52 @@
 Device (PEG0)
 {
    Name (_ADR, 0x00060000)
+
+	OperationRegion (RPCS, PCI_Config, 0x4c, 4)
+	Field (RPCS, AnyAcc, NoLock, Preserve)
+	{
+		, 24,
+		RPPN, 8,	/* Root Port Number */
+	}
+
+	Method (_PRT)
+	{
+		Return (IRQM (RPPN))
+	}
 }

Device (PEG1)
 {
    Name (_ADR, 0x00060002)
+
+	OperationRegion (RPCS, PCI_Config, 0x4c, 4)
+	Field (RPCS, AnyAcc, NoLock, Preserve)
+	{
+		, 24,
+		RPPN, 8,	/* Root Port Number */
+	}
+
+	Method (_PRT)
+	{
+		Return (IRQM (RPPN))
+	}
 }

Device (PEG2)
 {
    Name (_ADR, 0x00010000)
+
+	OperationRegion (RPCS, PCI_Config, 0x4c, 4)
+	Field (RPCS, AnyAcc, NoLock, Preserve)
+	{
+		, 24,
+		RPPN, 8,	/* Root Port Number */
+	}
+
+	Method (_PRT)
+	{
+		Return (IRQM (RPPN))
+	}
 }
 #endif

diff --git a/src/soc/intel/alderlake/acpi/pcie_pch_s.asl b/src/soc/intel/alderlake/acpi/pcie_pch_s.asl
index 5437730..c2f22b5 100644
--- a/src/soc/intel/alderlake/acpi/pcie_pch_s.asl
+++ b/src/soc/intel/alderlake/acpi/pcie_pch_s.asl
@@ -275,14 +275,26 @@
 Device (PEG0)
 {
    Name (_ADR, 0x00060000)
+	Method (_PRT)
+	{
+		Return (IRQM (1))
+	}
 }

Device (PEG1)
 {
    Name (_ADR, 0x00010000)
+	Method (_PRT)
+	{
+		Return (IRQM (1))
+	}
 }

Device (PEG2)
 {
    Name (_ADR, 0x00010001)
+	Method (_PRT)
+	{
+		Return (IRQM (2))
+	}
 }