From 91337fd8da2e672438fe5e01b64207ccd8b44b36 Mon Sep 17 00:00:00 2001
From: Vladimir Serbinenko <phcoder@gmail.com>
Date: Wed, 20 Aug 2014 22:46:14 +0200
Subject: Merge LCD on sandy/ivy

Change-Id: Ibf66d46f47fe465cc805f85de818a77327cd7258
Signed-off-by: Vladimir Serbinenko <phcoder@gmail.com>
Reviewed-on: http://review.coreboot.org/6722
Tested-by: build bot (Jenkins)
Reviewed-by: Ronald G. Minnich <rminnich@gmail.com>
Reviewed-by: Edward O'Callaghan <eocallaghan@alterapraxis.com>
---
 src/northbridge/intel/sandybridge/acpi/igd.asl | 90 ++++++++++++++++++++++++++
 1 file changed, 90 insertions(+)

(limited to 'src/northbridge/intel/sandybridge')

diff --git a/src/northbridge/intel/sandybridge/acpi/igd.asl b/src/northbridge/intel/sandybridge/acpi/igd.asl
index 69ff37aed5..d40fad54f5 100644
--- a/src/northbridge/intel/sandybridge/acpi/igd.asl
+++ b/src/northbridge/intel/sandybridge/acpi/igd.asl
@@ -337,4 +337,94 @@ Device (GFX0)
 		}
 	}
 
+#ifdef HAVE_LCD_SCREEN
+	Device (LCD0)
+	{
+		Name (_ADR, 0x0400)
+		Name (BRCT, 0)
+
+		Name (BRIG, Package (0x12)
+		{
+			0x61,
+			0x61,
+			0x2,
+			0x4,
+			0x5,
+			0x7,
+			0x9,
+			0xb,
+			0xd,
+			0x11,
+			0x14,
+			0x17,
+			0x1c,
+			0x20,
+			0x27,
+			0x31,
+			0x41,
+			0x61,
+		})
+
+		Method (_BCL, 0, NotSerialized)
+		{
+			Store (1, BRCT)
+			Return (BRIG)
+		}
+
+		Method (_BCM, 1, NotSerialized)
+		{
+			Store (ShiftLeft (Arg0, 4), ^^BCLV)
+			Store (0x80000000, ^^CR1)
+			Store (0x061a061a, ^^CR2)
+		}
+		Method (_BQC, 0, NotSerialized)
+		{
+			Store (^^BCLV, Local0)
+			ShiftRight (Local0, 4, Local0)
+			Return (Local0)
+		}
+
+		Method(BRID, 1, NotSerialized)
+		{
+			Store (Match (BRIG, MEQ, Arg0, MTR, Zero, 2), Local0)
+			If (LEqual (Local0, Ones))
+			{
+				Return (0x11)
+			}
+			Return (Local0)
+		}
+
+		/* Using Notify is the right way. But Windows doesn't handle
+		   it well. So use both method in a way to avoid double action.
+		 */
+		Method (DECB, 0, NotSerialized)
+		{
+			If (BRCT)
+			{
+				Notify (LCD0, 0x87)
+			} Else {
+				Store (BRID (_BQC ()), Local0)
+				If (LNotEqual (Local0, 2))
+				{
+					Decrement (Local0)
+				}
+				_BCM (DerefOf (Index (BRIG, Local0)))
+			}
+		}
+		Method (INCB, 0, NotSerialized)
+		{
+			If (BRCT)
+			{
+				Notify (LCD0, 0x86)
+			} Else {
+				Store (BRID (_BQC ()), Local0)
+				If (LNotEqual (Local0, 0x11))
+				{
+					Increment (Local0)
+				}
+				_BCM (DerefOf (Index (BRIG, Local0)))
+			}
+		}
+	}
+#endif
 }
-- 
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