pine64-pinephone: reset modem after applying configuration

The datasheet says that the AT+QDAI audio routing configuration is saved
to non-volatile memory directly, and therefore needs a modem reset to be
applied.

This commits changes the audio routing configuration script to first
check for the current configuration, and only change it if it is
different from the one wanted.

The new configuration is then sent, and modem is reset to apply
configuration.

device/device-pine64-pinephone/APKBUILD

@@ -89,5 +89,5 @@ aa0b7191548e89ddfc6cf5b1f637c7ee7ab4c2025cbfc6328e7e482e5b179ea072779ca332a18094
 3cf0f2b0d463c1cf79156facfbddfa7e5bb9dffc54c364e0aa27e4f5e4778ec889febe8aecc819782db4f8423ac3cff2264c8e96c7e4f327519a4c403e087ce1  HiFi
 7071765039f282185d5a5f64912f41f96562785436018b4391f87e68bd9636addac496ebec239f7d82f7ef55401ac0cfe03ec1aebb454bd2eedf5b1251da758f  VoiceCall
 5a1a9c774253e8211cc54f4b3961c4bdc35427726d037b0ecad099915e856590e8267a4a47943ab753772d57261eef89924b407b305b1099a9c4ecd7b5f00b35  eg25.initd
-78f353cfe59657614ad5629435dc72a529b052986d646e29193645dcfd3663f5704542afd9a43f8b4ea65d1614ad32598a5434409ac524559ff66a9ab9b60856  setup-modem-audio.sh
+dc110f617efe28df3001630836c7df0cab20e74e99c4bb9d2c2f86367ae024dd30060e8c051c7be0e66e86f4656bef345189a6c13276808c4301d1a6deb8be7d  setup-modem-audio.sh
 1b244cc6bfda4ff6c719c2dc077a2600376301d995607d15840994885b9044335d92d085282566a8baa0c2deb090ce958c586ea1e5950baf0e13686aef257b20  setup-modem-audio.initd"

device/device-pine64-pinephone/setup-modem-audio.sh

 #!/bin/sh
 
-RET=$(echo "AT+QDAI=1,0,0,2,0,1,1,1" | atinout - /dev/EG25.AT -)
+# Current modem routing
+#
+#  1 - Digital PCM
+#  0 - I2S master
+#  0 - Primary mode (short sync)
+#  2 - 512kHz clock (512kHz / 16bit = 32k samples/s)
+#  0 - 16bit linear format
+#  1 - 16k sample/s
+#  1 - 1 slot
+#  1 - map to first slot (the only slot)
+#
+QDAI_CONFIG="1,0,0,2,0,1,1,1"
 
-if echo $RET | grep -q OK; then
+DEV=/dev/EG25.AT
+
+# Read current config
+RET=$(echo "AT+QDAI?" | atinout - $DEV -)
+
+if echo $RET | grep -q $QDAI_CONFIG
+then
+	echo "Modem audio already configured"
+	exit 0
+fi
+
+
+# Modem not configured, we need to send it the digital interface configuration,
+# then reboot it
+RET=$(echo "AT+QDAI=$QDAI_CONFIG" | atinout - $DEV -)
+
+if echo $RET | grep -q OK
+then
 	echo "Successfully configured modem audio"
 else
 	echo "Failed to set modem audio up: $RET"
 	exit 1
 fi
+
+# Reset module
+# 1 Set the mode to full functionality (vs 4: no RF, and 1: min functionality)
+# 1 Reset the modem before changing mode (only available with 1 above)
+#
+RET=$(echo "AT+CFUN=1,1" | atinout - $DEV -)
+
+if echo $RET | grep -q OK
+then
+	echo "Successfully reset the modem to apply audio configuration"
+else
+	echo "Failed to reset the modem to apply audio configuration: $RET"
+fi