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alsa-ucm: Disable UCM devices when suspending

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This might save some power, according to the discussion here:
https://gitlab.freedesktop.org/pulseaudio/pulseaudio/-/merge_requests/294#note_522388
This commit is contained in:
Tanu Kaskinen 2020-06-10 11:15:21 +03:00
parent 738f64a133
commit 45cf9d61e7
4 changed files with 54 additions and 0 deletions
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13
src/modules/alsa/alsa-sink.c
View file

@ -1049,6 +1049,12 @@ static void suspend(struct userdata *u) {
pa_sink_set_max_rewind_within_thread(u->sink, 0);
pa_sink_set_max_request_within_thread(u->sink, 0);
/* Disabling the UCM devices may save some power. */
if (u->ucm_context) {
pa_alsa_ucm_port_data *data = PA_DEVICE_PORT_DATA(u->sink->active_port);
pa_alsa_ucm_port_enable_devices(data, false);
}
pa_log_info("Device suspended...");
}
@ -1164,6 +1170,13 @@ static int unsuspend(struct userdata *u, bool recovering) {
pa_log_info("Trying resume...");
/* We disable all UCM devices when suspending, so let's enable them
* again. */
if (u->ucm_context) {
pa_alsa_ucm_port_data *data = PA_DEVICE_PORT_DATA(u->sink->active_port);
pa_alsa_ucm_port_enable_devices(data, true);
}
if ((is_iec958(u) || is_hdmi(u)) && pa_sink_is_passthrough(u->sink)) {
/* Need to open device in NONAUDIO mode */
int len = strlen(u->device_name) + 8;

13
src/modules/alsa/alsa-source.c
View file

@ -954,6 +954,12 @@ static void suspend(struct userdata *u) {
/* Close PCM device */
close_pcm(u);
/* Disabling the UCM devices may save some power. */
if (u->ucm_context) {
pa_alsa_ucm_port_data *data = PA_DEVICE_PORT_DATA(u->source->active_port);
pa_alsa_ucm_port_enable_devices(data, false);
}
pa_log_info("Device suspended...");
}
@ -1044,6 +1050,13 @@ static int unsuspend(struct userdata *u, bool recovering) {
pa_log_info("Trying resume...");
/* We disable all UCM devices when suspending, so let's enable them
* again. */
if (u->ucm_context) {
pa_alsa_ucm_port_data *data = PA_DEVICE_PORT_DATA(u->source->active_port);
pa_alsa_ucm_port_enable_devices(data, true);
}
if ((err = snd_pcm_open(&u->pcm_handle, u->device_name, SND_PCM_STREAM_CAPTURE,
SND_PCM_NONBLOCK|
SND_PCM_NO_AUTO_RESAMPLE|

26
src/modules/alsa/alsa-ucm.c
View file

@ -2245,6 +2245,29 @@ static void ucm_port_update_available(pa_alsa_ucm_port_data *port) {
pa_device_port_set_available(port->core_port, available);
}
void pa_alsa_ucm_port_enable_devices(pa_alsa_ucm_port_data *data, bool enable) {
pa_alsa_ucm_device *dev;
uint32_t idx;
pa_assert(data);
/* first disable then enable */
PA_DYNARRAY_FOREACH(dev, data->devices, idx) {
int r;
if (enable) {
pa_log_debug("Enabling UCM device %s.", dev->name);
if ((r = snd_use_case_set(data->ucm->ucm_mgr, "_enadev", dev->name) < 0))
pa_log("Failed to enable UCM device %s: %s", dev->name, pa_cstrerror(r));
} else {
pa_log_debug("Disabling UCM device %s.", dev->name);
if ((r = snd_use_case_set(data->ucm->ucm_mgr, "_disdev", dev->name) < 0))
pa_log("Failed to disable UCM device %s: %s", dev->name, pa_cstrerror(r));
}
}
}
#else /* HAVE_ALSA_UCM */
/* Dummy functions for systems without UCM support */
@ -2301,4 +2324,7 @@ void pa_alsa_ucm_roled_stream_begin(pa_alsa_ucm_config *ucm, const char *role, p
void pa_alsa_ucm_roled_stream_end(pa_alsa_ucm_config *ucm, const char *role, pa_direction_t dir) {
}
void pa_alsa_ucm_port_enable_devices(pa_alsa_ucm_port_data *data, bool enable) {
}
#endif

2
src/modules/alsa/alsa-ucm.h
View file

@ -285,6 +285,8 @@ struct pa_alsa_ucm_port_data {
int eld_device; /* PCM device number */
};
void pa_alsa_ucm_port_enable_devices(pa_alsa_ucm_port_data *data, bool enable);
struct pa_alsa_ucm_volume {
char *mixer_elem; /* mixer element identifier */
char *master_elem; /* master mixer element identifier */