Audio: TDFB: Fix a mistake in sound direction updates filtering

Check for four least significant bits set means that four
previous processes periods need to be high enough signal
level over ambient. The value 0x15 is an obvious mistake and
does not filter properly control events. The purpose of the filter
is to prevent too frequent or unreliable control updates.

Signed-off-by: Seppo Ingalsuo <seppo.ingalsuo@linux.intel.com>

Author: singalsu

src/audio/tdfb/tdfb_direction.c

@@ -42,6 +42,11 @@
 /* Threshold for notifying user space, no more often than every 200 ms */
 #define CONTROL_UPDATE_MIN_TIME	Q_CONVERT_FLOAT(0.2, 16)
 
+/* Another filter, a bit mask for controlling notifications to user space, at least four
+ * periods with level over ambient
+ */
+#define CONTROL_UPDATE_MIN_MASK		0x0f
+
 /* Emphasis filters for sound direction (IIR). These coefficients were
  * created with the script tools/tune/tdfb/example_direction_emphasis.m
  * from output files tdfb_iir_emphasis_48k.h and tdfb_iir_emphasis_16k.h.
@@ -556,7 +561,7 @@ void tdfb_direction_estimate(struct tdfb_comp_data *cd, int frames, int ch_count
 	 * to update user space.
 	 */
 	if (new_az_value != cd->az_value_estimate && time_since > CONTROL_UPDATE_MIN_TIME &&
-	    (cd->direction.trigger & 0x15) == 0x15) {
+	    (cd->direction.trigger & CONTROL_UPDATE_MIN_MASK) == CONTROL_UPDATE_MIN_MASK) {
 		cd->az_value_estimate = new_az_value;
 		cd->direction.frame_count_since_control = 0;
 		cd->direction_change = true;