From f5cd9a15bac9b691cb7563abd6b9bae8588b1bca Mon Sep 17 00:00:00 2001
From: Tim Wawrzynczak <twawrzynczak@chromium.org>
Date: Fri, 29 Apr 2022 13:31:00 -0600
Subject: [PATCH] mb/google/brya/acpi: Add support for NBCI _DSM subfunction

The Nvidia GPU supports another function named NBCI (NoteBook Common
Interface), which has some subfunctions which are required for the
Nvidia kernel driver to consume. The specification for this function
comes from the Nvidia GN20 Software Design Guide.

BUG=b:214581763
TEST=build

Signed-off-by: Tim Wawrzynczak <twawrzynczak@chromium.org>
Change-Id: I19eb9417923d297a084d6f5329682e91cd506a9e
Reviewed-on: https://review.coreboot.org/c/coreboot/+/64008
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Subrata Banik <subratabanik@google.com>
Reviewed-by: Eric Lai <eric_lai@quanta.corp-partner.google.com>
---
 src/mainboard/google/brya/acpi/gpu_top.asl |  8 +++
 src/mainboard/google/brya/acpi/nbci.asl    | 74 ++++++++++++++++++++++
 2 files changed, 82 insertions(+)
 create mode 100644 src/mainboard/google/brya/acpi/nbci.asl

diff --git a/src/mainboard/google/brya/acpi/gpu_top.asl b/src/mainboard/google/brya/acpi/gpu_top.asl
index c23a0ce003..b7e90335b6 100644
--- a/src/mainboard/google/brya/acpi/gpu_top.asl
+++ b/src/mainboard/google/brya/acpi/gpu_top.asl
@@ -22,6 +22,7 @@ Scope (\_SB.PCI0.PEG0)
 		#include "power.asl"
 		#include "nvop.asl"
 		#include "nvjt.asl"
+		#include "nbci.asl"
 
 		Method (_DSM, 4, Serialized)
 		{
@@ -39,6 +40,13 @@ Scope (\_SB.PCI0.PEG0)
 					Return (NVJT (Arg2, Arg3))
 				}
 			}
+			ElseIf (Arg0 == ToUUID (UUID_NBCI))
+			{
+				If (ToInteger (Arg1) >= REVISION_MIN_NBCI)
+				{
+					Return (NBCI (Arg2, Arg3))
+				}
+			}
 
 			Return (NV_ERROR_UNSUPPORTED)
 		}
diff --git a/src/mainboard/google/brya/acpi/nbci.asl b/src/mainboard/google/brya/acpi/nbci.asl
new file mode 100644
index 0000000000..0564f7aea4
--- /dev/null
+++ b/src/mainboard/google/brya/acpi/nbci.asl
@@ -0,0 +1,74 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+
+#define NBCI_FUNC_SUPPORT	0
+#define NBCI_FUNC_PLATCAPS	1
+#define NBCI_FUNC_GETOBJBYTYPE	16
+#define NBCI_FUNC_GETCALLBACKS	19
+
+/* 'DR' in ASCII, for DRiver Object */
+#define NBCI_OBJTYPE_DR		0x4452
+
+Method (NBCI, 2, Serialized)
+{
+	Switch (ToInteger (Arg0))
+	{
+		Case (NBCI_FUNC_SUPPORT)
+		{
+			Return (ITOB(
+				(1 << NBCI_FUNC_SUPPORT) |
+				(1 << NBCI_FUNC_PLATCAPS) |
+				(1 << NBCI_FUNC_GETOBJBYTYPE)))
+		}
+		Case (NBCI_FUNC_PLATCAPS)
+		{
+			Return (ITOB(
+				(0 << 10) |	/* No 3D Hotkeys */
+				(0 << 9)  |	/* Do not enumerate a dock */
+				(0 << 7)  |	/* Does not have DISPLAYSTATUS */
+				(0 << 5)  |	/* No LID support */
+				(0 << 4)))	/* No Aux power state request */
+		}
+		Case (NBCI_FUNC_GETCALLBACKS)
+		{
+			Return (0)
+		}
+		Case (NBCI_FUNC_GETOBJBYTYPE)
+		{
+			CreateWordField (Arg1, 2, BFF0)
+			If (BFF0 == NBCI_OBJTYPE_DR)
+			{
+				Return (Buffer(0xa1)
+				{
+					/* DR ("Driver Object") is a data object which
+					 * might vary depending on the eDP panel used. */
+					0x57, 0x74, 0xdc, 0x86, 0x75, 0x84, 0xec, 0xe7,
+					0x52, 0x44, 0xa1, 0x00, 0x00, 0x00, 0x00, 0x01,
+					0x00, 0x00, 0x00, 0x00, 0xde, 0x10, 0x00, 0x00,
+					0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+					0x09, 0x00, 0x00, 0x00, 0x00, 0x00, 0x34, 0x00,
+					0x00, 0x00, 0x01, 0x00, 0x47, 0x00, 0x00, 0x00,
+					0x02, 0x00, 0x45, 0x00, 0x00, 0x00, 0x03, 0x00,
+					0x51, 0x00, 0x00, 0x00, 0x04, 0x00, 0x4f, 0x00,
+					0x00, 0x00, 0x05, 0x00, 0x4d, 0x00, 0x00, 0x00,
+					0x06, 0x00, 0x4b, 0x00, 0x00, 0x00, 0x07, 0x00,
+					0x49, 0x00, 0x00, 0x00, 0x08, 0x00, 0x47, 0x00,
+					0x00, 0x00, 0x01, 0x00, 0x00, 0x00, 0xd9, 0x1c,
+					0x04, 0x00, 0x00, 0x00, 0x02, 0x00, 0x00, 0x00,
+					0x41, 0x5d, 0xc9, 0x00, 0x01, 0x24, 0x2e, 0x00,
+					0x02, 0x00, 0xff, 0x00, 0x00, 0x00, 0x00, 0x01,
+					0x00, 0x00, 0x00, 0xd9, 0x1c, 0x04, 0x00, 0x00,
+					0x00, 0x01, 0x00, 0x00, 0x00, 0x60, 0x68, 0x9e,
+					0x35, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+					0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+					0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+					0x00
+				})
+			} Else {
+				Return (NV_ERROR_UNSPECIFIED)
+			}
+
+		}
+	}
+
+	Return (NV_ERROR_UNSUPPORTED)
+}