gpu: drm: apple: Add DCP audio driver

Signed-off-by: Martin Povišer <povik+lin@cutebit.org>

Author: povik

drivers/gpu/drm/apple/Kconfig

@@ -18,6 +18,7 @@ config DRM_APPLE_AUDIO
 	depends on DRM_APPLE
 	depends on SND
 	select SND_PCM
+	select SND_DMAENGINE_PCM
 
 config DRM_APPLE_DEBUG
 	bool "Enable additional driver debugging"

drivers/gpu/drm/apple/Makefile

@@ -12,14 +12,19 @@ apple_dcp-y += iomfb_v12_3.o
 apple_dcp-y += iomfb_v13_3.o
 apple_dcp-$(CONFIG_TRACING) += trace.o
 
+apple_dcp_audio-y := audio.o
 
 obj-$(CONFIG_DRM_APPLE) += appledrm.o
 obj-$(CONFIG_DRM_APPLE) += apple_dcp.o
+ifeq ($(CONFIG_DRM_APPLE_AUDIO),y)
+obj-$(CONFIG_DRM_APPLE) += apple_dcp_audio.o
+endif
 
 # header test
 
 # exclude some broken headers from the test coverage
 no-header-test := \
+	hdmi-codec-chmap.h
 
 always-y += \
 	$(patsubst %.h,%.hdrtest, $(filter-out $(no-header-test), \