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alsa: fix infinite loop with Intel HDMI LPE

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The Intel HDMI LPE driver works in a peculiar way when the HDMI cable is
not plugged in: any written audio is immediately discarded and underrun
is reported. That resulted in an infinite loop, because PulseAudio tried
to keep the buffer filled, which was futile since the written audio was
immediately consumed/discarded.

This patch adds special handling for the LPE driver: if the active port
of the sink is unavailable, the sink suspends itself. A new suspend
cause is added: PA_SUSPEND_UNAVAILABLE.

BugLink: https://bugs.freedesktop.org/show_bug.cgi?id=100488
This commit is contained in:
Tanu Kaskinen 2017-12-28 12:09:17 +02:00
parent d9624e0382
commit 94fc586c01
4 changed files with 58 additions and 0 deletions
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1
src/modules/alsa/alsa-mixer.h
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@ -364,6 +364,7 @@ int pa_alsa_set_mixer_rtpoll(struct pa_alsa_mixer_pdata *pd, snd_mixer_t *mixer,
struct pa_alsa_port_data {
pa_alsa_path *path;
pa_alsa_setting *setting;
bool suspend_when_unavailable;
};
void pa_alsa_add_ports(void *sink_or_source_new_data, pa_alsa_path_set *ps, pa_card *card);