1 files changed, 95 insertions, 0 deletions
diff --git a/src/mainboard/google/brya/acpi/peg.asl b/src/mainboard/google/brya/acpi/peg.asl
new file mode 100644
index 0000000000..55551bc714
--- /dev/null
+++ b/src/mainboard/google/brya/acpi/peg.asl
@@ -0,0 +1,95 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+
+External (\_SB.PCI0.DGPU, DeviceObj)
+External (\_SB.PCI0.PEG0.PEGP._OFF, MethodObj)
+External (\_SB.PCI0.PEG0.PEGP._ON, MethodObj)
+
+OperationRegion (PCIC, PCI_Config, 0x00, 0x100)
+Field (PCIC, AnyAcc, NoLock, Preserve)
+{
+	Offset (0x52),
+	,	13,
+	LASX,	1,		/* Link Active Status */
+	Offset (0xe0),
+	,	7,
+	NCB7,	1,		/* Scratch bit to save L2/3 state */
+	Offset (0xe2),
+	,	2,
+	L23E,	1,		/* L23_Rdy Entry request */
+	L23R,	1		/* L23_Rdy Detect Transition */
+}
+
+/* L2/3 Entry sequence */
+Method (DL23, 0, Serialized)
+{
+	L23E = 1
+	Local0 = 8
+	While (Local0 > 0)
+	{
+		If (!L23E)
+		{
+			Break
+		}
+
+		Sleep (16)
+		Local0--
+	}
+	NCB7 = 1
+}
+
+/* L2/3 exit seqeuence */
+Method (LD23, 0, Serialized)
+{
+	If (!NCB7)
+	{
+		Return
+	}
+
+	L23R = 1
+	Local0 = 20
+	While (Local0 > 0)
+	{
+		If (!L23R)
+		{
+			Break
+		}
+
+		Sleep (16)
+		Local0--
+	}
+
+	NCB7 = 0
+	Local0 = 8
+	While (Local0 > 0)
+	{
+		If (LASX == 1)
+		{
+			Break
+		}
+
+		Sleep (16)
+		Local0--
+	}
+}
+
+/* PEG Power Resource */
+PowerResource (PGPR, 0, 0)
+{
+	Method (_ON, 0, Serialized)
+	{
+		/* Power up GPU from GCOFF (or GC6 exit if deferred) */
+		\_SB.PCI0.PEG0.PEGP._ON ()
+		_STA = 1
+	}
+	Method (_OFF, 0, Serialized)
+	{
+		/* Power down GPU to GCOFF (or GC6 entry if deferred) */
+		_STA = 0
+		\_SB.PCI0.PEG0.PEGP._OFF ()
+	}
+	Name (_STA, 0)
+}
+
+Name (_PR0, Package() { PGPR })
+Name (_PR2, Package() { PGPR })
+Name (_PR3, Package() { PGPR })