DRAFT: J414c offline USB4 DP lifecycle prototype

drivers/gpu/drm/apple/Kconfig

@@ -28,3 +28,15 @@ config DRM_APPLE_DEBUG
 	bool "Enable additional driver debugging"
 	depends on DRM_APPLE
 	depends on EXPERT # only for developers
+
+config DRM_APPLE_KUNIT_TEST
+	bool "KUnit tests for Apple DRM" if !KUNIT_ALL_TESTS
+	depends on DRM_APPLE && KUNIT=y
+	default KUNIT_ALL_TESTS
+	help
+	  This builds unit tests for Apple DPTX transport-independent logic,
+	  including remote-target encoding, the side-effect-free logical USB4
+	  transport model, and the unconnected external-display ownership
+	  reducer. These tests are intended for kernel developers.
+
+	  If in doubt, say "N".

drivers/gpu/drm/apple/Makefile

@@ -3,7 +3,11 @@
 CFLAGS_trace.o = -I$(src)
 
 appledrm-y := apple_drv.o
-appledrm-y += afk.o dcp.o dcp_backlight.o dptxep.o iomfb.o parser.o systemep.o
+appledrm-y += afk.o dcp.o dcp_backlight.o dptxep.o dptx-transport.o
+appledrm-y += dptx-transport-phy.o iomfb.o parser.o systemep.o
+appledrm-$(CONFIG_DRM_APPLE_KUNIT_TEST) += dptx-transport-test.o
+appledrm-$(CONFIG_DRM_APPLE_KUNIT_TEST) += dptx-attempt-test.o
+appledrm-$(CONFIG_DRM_APPLE_KUNIT_TEST) += dcp-display-source-test.o
 appledrm-$(CONFIG_DRM_APPLE_AUDIO) += audio.o
 appledrm-$(CONFIG_DRM_APPLE_AUDIO) += av.o
 appledrm-y += connector.o