audio: Add a delay for DSP firmware loading

This is turned off by default.

Change-Id: Idf764933c67e6666cb2cc0043fa7a7e86935488d
diff --git a/audio/include/samsung_audio.h b/audio/include/samsung_audio.h
index 8b8aeac..1bd094a 100644
--- a/audio/include/samsung_audio.h
+++ b/audio/include/samsung_audio.h
@@ -57,4 +57,15 @@
  */
 #define SUPPORTS_IRQ_AFFINITY 0
 
+/*
+ * The Wolfson/Cirruslogic chips need to shutdown the DAPM route completely
+ * to be able to load a new firmware. Some of these chips need a delay after
+ * shutodown to full poweroff the DSPs.
+ *
+ * A good value to start with is 10ms:
+ *
+ * #define DSP_POWEROFF_DELAY 10 * 1000
+ */
+/* #define DSP_POWEROFF_DELAY 0 */
+
 #endif // SAMSUNG_AUDIO_H