From abe23b588589631e65d438185f05fd3438927e68 Mon Sep 17 00:00:00 2001
From: Robin Gareus <robin@gareus.org>
Date: Sat, 9 May 2020 01:21:11 +0200
Subject: [PATCH] ALSA backend: ignore idempotent latency settings

---
 libs/backends/alsa/alsa_audiobackend.cc | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/libs/backends/alsa/alsa_audiobackend.cc b/libs/backends/alsa/alsa_audiobackend.cc
index 71bef7517a..e246ad63af 100644
--- a/libs/backends/alsa/alsa_audiobackend.cc
+++ b/libs/backends/alsa/alsa_audiobackend.cc
@@ -435,6 +435,9 @@ AlsaAudioBackend::set_output_channels (uint32_t cc)
 int
 AlsaAudioBackend::set_systemic_input_latency (uint32_t sl)
 {
+	if (_systemic_audio_input_latency == sl) {
+		return 0;
+	}
 	_systemic_audio_input_latency = sl;
 	if (_run) {
 		update_systemic_audio_latencies();
@@ -445,6 +448,9 @@ AlsaAudioBackend::set_systemic_input_latency (uint32_t sl)
 int
 AlsaAudioBackend::set_systemic_output_latency (uint32_t sl)
 {
+	if (_systemic_audio_output_latency == sl) {
+		return 0;
+	}
 	_systemic_audio_output_latency = sl;
 	if (_run) {
 		update_systemic_audio_latencies();