disp: add support to compile out display kernel module

This change provides required support to disable display module
compilation along with all modules and supports module specific
override to enable compilation if required.

Change-Id: I38acdce4083e38245eb6285c99d5dbbd15911fbb
Signed-off-by: Prabhanjan Kandula <[email protected]>

Android.mk

@@ -1,3 +1,12 @@
 # Android makefile for display kernel modules
-LOCAL_PATH := $(call my-dir)
-include $(LOCAL_PATH)/msm/Android.mk
+DISPLAY_DLKM_ENABLE := true
+ifeq ($(TARGET_KERNEL_DLKM_DISABLE), true)
+	ifeq ($(TARGET_KERNEL_DLKM_DISPLAY_OVERRIDE), false)
+		DISPLAY_DLKM_ENABLE := false
+	endif
+endif
+
+ifeq ($(DISPLAY_DLKM_ENABLE),  true)
+	LOCAL_PATH := $(call my-dir)
+	include $(LOCAL_PATH)/msm/Android.mk
+endif

display_driver_board.mk

@@ -1,7 +1,15 @@
 #SPDX-License-Identifier: GPL-2.0-only
+DISPLAY_DLKM_ENABLE := true
+ifeq ($(TARGET_KERNEL_DLKM_DISABLE), true)
+	ifeq ($(TARGET_KERNEL_DLKM_DISPLAY_OVERRIDE), false)
+		DISPLAY_DLKM_ENABLE := false
+	endif
+endif
 
-ifeq ($(call is-board-platform-in-list,$(TARGET_BOARD_PLATFORM)),true)
-	BOARD_VENDOR_KERNEL_MODULES += $(KERNEL_MODULES_OUT)/msm_drm.ko
-	BOARD_VENDOR_RAMDISK_KERNEL_MODULES += $(KERNEL_MODULES_OUT)/msm_drm.ko
-	BOARD_VENDOR_RAMDISK_RECOVERY_KERNEL_MODULES_LOAD += $(KERNEL_MODULES_OUT)/msm_drm.ko
+ifeq ($(DISPLAY_DLKM_ENABLE),  true)
+	ifeq ($(call is-board-platform-in-list,$(TARGET_BOARD_PLATFORM)),true)
+		BOARD_VENDOR_KERNEL_MODULES += $(KERNEL_MODULES_OUT)/msm_drm.ko
+		BOARD_VENDOR_RAMDISK_KERNEL_MODULES += $(KERNEL_MODULES_OUT)/msm_drm.ko
+		BOARD_VENDOR_RAMDISK_RECOVERY_KERNEL_MODULES_LOAD += $(KERNEL_MODULES_OUT)/msm_drm.ko
+	endif
 endif

display_driver_product.mk

@@ -1,3 +1,12 @@
 # SPDX-License-Identifier: GPL-2.0-only
 
-PRODUCT_PACKAGES += msm_drm.ko
+DISPLAY_DLKM_ENABLE := true
+ifeq ($(TARGET_KERNEL_DLKM_DISABLE), true)
+	ifeq ($(TARGET_KERNEL_DLKM_DISPLAY_OVERRIDE), false)
+		DISPLAY_DLKM_ENABLE := false
+	endif
+endif
+
+ifeq ($(DISPLAY_DLKM_ENABLE),  true)
+	PRODUCT_PACKAGES += msm_drm.ko
+endif