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ALSA: hda/hdmi - Don't report spurious jack state changes

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[ Upstream commit 551626ec0a ]

The HDMI jack handling reports the state change always via
snd_jack_report() whenever hdmi_present_sense() is called, even if the
state itself doesn't change from the previous time.  This is mostly
harmless but still a bit confusing to user-space.

This patch reduces such spurious jack state changes and reports only
when the state really changed.  Also, as a minor optimization, avoid
overwriting the pin ELD data when the state is identical.

Reviewed-by: Kai Vehmanen <kai.vehmanen@linux.intel.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Takashi Iwai
2019-07-17 14:30:23 +02:00
committed by Greg Kroah-Hartman
parent 7e8e29512e
commit acc7ede76e
1 changed files with 18 additions and 14 deletions
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18
sound/pci/hda/patch_hdmi.c
View File

@@ -1421,7 +1421,7 @@ static void hdmi_pcm_reset_pin(struct hdmi_spec *spec,
/* update per_pin ELD from the given new ELD;
* setup info frame and notification accordingly
*/
static void update_eld(struct hda_codec *codec,
static bool update_eld(struct hda_codec *codec,
struct hdmi_spec_per_pin *per_pin,
struct hdmi_eld *eld)
{
@@ -1452,18 +1452,22 @@ static void update_eld(struct hda_codec *codec,
snd_hdmi_show_eld(codec, &eld->info);
eld_changed = (pin_eld->eld_valid != eld->eld_valid);
if (eld->eld_valid && pin_eld->eld_valid)
eld_changed |= (pin_eld->monitor_present != eld->monitor_present);
if (!eld_changed && eld->eld_valid && pin_eld->eld_valid)
if (pin_eld->eld_size != eld->eld_size ||
memcmp(pin_eld->eld_buffer, eld->eld_buffer,
eld->eld_size) != 0)
eld_changed = true;
if (eld_changed) {
pin_eld->monitor_present = eld->monitor_present;
pin_eld->eld_valid = eld->eld_valid;
pin_eld->eld_size = eld->eld_size;
if (eld->eld_valid)
memcpy(pin_eld->eld_buffer, eld->eld_buffer, eld->eld_size);
memcpy(pin_eld->eld_buffer, eld->eld_buffer,
eld->eld_size);
pin_eld->info = eld->info;
}
/*
* Re-setup pin and infoframe. This is needed e.g. when
@@ -1481,6 +1485,7 @@ static void update_eld(struct hda_codec *codec,
SNDRV_CTL_EVENT_MASK_VALUE |
SNDRV_CTL_EVENT_MASK_INFO,
&get_hdmi_pcm(spec, pcm_idx)->eld_ctl->id);
return eld_changed;
}
/* update ELD and jack state via HD-audio verbs */
@@ -1582,6 +1587,7 @@ static void sync_eld_via_acomp(struct hda_codec *codec,
struct hdmi_spec *spec = codec->spec;
struct hdmi_eld *eld = &spec->temp_eld;
struct snd_jack *jack = NULL;
bool changed;
int size;
mutex_lock(&per_pin->lock);
@@ -1608,15 +1614,13 @@ static void sync_eld_via_acomp(struct hda_codec *codec,
* disconnected event. Jack must be fetched before update_eld()
*/
jack = pin_idx_to_jack(codec, per_pin);
update_eld(codec, per_pin, eld);
changed = update_eld(codec, per_pin, eld);
if (jack == NULL)
jack = pin_idx_to_jack(codec, per_pin);
if (jack == NULL)
goto unlock;
if (changed && jack)
snd_jack_report(jack,
(eld->monitor_present && eld->eld_valid) ?
SND_JACK_AVOUT : 0);
unlock:
mutex_unlock(&per_pin->lock);
}