drm: apple: Add Kconfig option for audio

Signed-off-by: Janne Grunau <j@jannau.net>

Author: jannau

drivers/gpu/drm/apple/Kconfig

@@ -12,3 +12,10 @@ config DRM_APPLE
 	select MULTIPLEXER
 	help
 	  Say Y if you have an Apple Silicon chipset.
+
+config DRM_APPLE_AUDIO
+	bool "DisplayPort/HDMI Audio support"
+	default y
+	depends on DRM_APPLE
+	depends on SND
+	select SND_PCM

drivers/gpu/drm/apple/parser.c

@@ -7,7 +7,9 @@
 #include <linux/string.h>
 #include <linux/slab.h>
 
+#if IS_ENABLED(CONFIG_DRM_APPLE_AUDIO)
 #include <sound/pcm.h> // for sound format masks
+#endif
 
 #include "parser.h"
 #include "trace.h"
@@ -119,6 +121,7 @@ static int skip(struct dcp_parse_ctx *handle)
 	}
 }
 
+#if IS_ENABLED(CONFIG_DRM_APPLE_AUDIO)
 static int skip_pair(struct dcp_parse_ctx *handle)
 {
 	int ret;
@@ -151,6 +154,7 @@ static bool consume_string(struct dcp_parse_ctx *ctx, const char *specimen)
 	skip(ctx);
 	return true;
 }
+#endif
 
 /* Caller must free the result */
 static char *parse_string(struct dcp_parse_ctx *handle)
@@ -201,6 +205,7 @@ static int parse_bool(struct dcp_parse_ctx *handle, bool *b)
 	return 0;
 }
 
+#if IS_ENABLED(CONFIG_DRM_APPLE_AUDIO)
 static int parse_blob(struct dcp_parse_ctx *handle, size_t size, u8 const **blob)
 {
 	const struct dcp_parse_tag *tag = parse_tag_of_type(handle, DCP_TYPE_BLOB);
@@ -220,6 +225,7 @@ static int parse_blob(struct dcp_parse_ctx *handle, size_t size, u8 const **blob
 	*blob = out;
 	return 0;
 }
+#endif
 
 struct iterator {
 	struct dcp_parse_ctx *handle;
@@ -680,6 +686,7 @@ int parse_epic_service_init(struct dcp_parse_ctx *handle, const char **name,
 	return ret;
 }
 
+#if IS_ENABLED(CONFIG_DRM_APPLE_AUDIO)
 static int parse_sample_rate_bit(struct dcp_parse_ctx *handle, unsigned int *ratebit)
 {
 	s64 rate;
@@ -983,6 +990,7 @@ int parse_sound_mode(struct dcp_parse_ctx *handle,
 	return 0;
 }
 EXPORT_SYMBOL_GPL(parse_sound_mode);
+#endif
 
 int parse_system_log_mnits(struct dcp_parse_ctx *handle, struct dcp_system_ev_mnits *entry)
 {