0001-hlte-common-audio-Override-pcm_id-for-USECASE_VOICE2.patch

From d91907ea59bfe7cb7d1cce5e06a80b60bc3c920a Mon Sep 17 00:00:00 2001
From: Paul Keith <javelinanddart@gmail.com>
Date: Thu, 26 Apr 2018 15:47:34 +0200
Subject: [PATCH 1/1] hlte-common: audio: Override pcm_id for
 USECASE_VOICE2_CALL

* Samsung appears to use PCM ID 43 for USECASE_VOICE2_CALL on stock
* The tipoff for an incorrect PCM ID was that the audio HAL was
  complaining about being unable to open /dev/snd/pcmC0D22p
  because of an invalid argument, even though the device existed
  (/dev/snd/pcmC0D22p is the PCM playback device with id 22, which
  is the default PCM ID for USECASE_VOICE2_CALL for MSM8974)
* The correct PCM ID was discovered by checking lsof during a call
  using USECASE_VOICE2_CALL on stock, and finding that the open
  devices were /dev/snd/pcmC0D43p and /dev/snd/pcmC0D43c, which
  are the PCM playback and capture devices with id 43 - which
  happens to be the proper PCM ID for USECASE_VOICE2_CALL for us

Change-Id: I1d886e4f22fc3a1884ed39ae3c08d17652b3f17b
---
 audio/audio_platform_info.xml | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/audio/audio_platform_info.xml b/audio/audio_platform_info.xml
index c93c89c..0df7867 100644
--- a/audio/audio_platform_info.xml
+++ b/audio/audio_platform_info.xml
@@ -55,7 +55,11 @@
     </backend_names>
 
     <pcm_ids>
-        <!-- empty -->
+        <!-- Output devices -->
+        <usecase name="USECASE_VOICE2_CALL" type="out" id="43"/>
+
+        <!-- Input devices -->
+        <usecase name="USECASE_VOICE2_CALL" type="in" id="43"/>
     </pcm_ids>
 
     <device_names>
-- 
2.7.4