ALSA: hda - Delay HDMI presence reports while waiting for ELD information

There is a small gap between the jack detection unsolicited event and
the time the ELD is updated.  When user-space queries the HDMI ELD
immediately after receiving the notification, it might fail because of
this gap.

For avoiding such a problem, this patch tries to delay the HDMI jack
detect notification until ELD information is fully updated.  The
workaround is imperfect, but good enough as a starting point.

Signed-off-by: Takashi Iwai <tiwai@suse.de>

1 files changed, 12 insertions, 5 deletions

diff --git a/sound/pci/hda/patch_hdmi.c b/sound/pci/hda/patch_hdmi.c
index e22323f50424..ce412d1a15d0 100644
--- a/sound/pci/hda/patch_hdmi.c
+++ b/sound/pci/hda/patch_hdmi.c
@@ -1140,7 +1140,7 @@ static void hdmi_setup_audio_infoframe(struct hda_codec *codec,
  * Unsolicited events
  */
 
-static void hdmi_present_sense(struct hdmi_spec_per_pin *per_pin, int repoll);
+static bool hdmi_present_sense(struct hdmi_spec_per_pin *per_pin, int repoll);
 
 static void hdmi_intrinsic_event(struct hda_codec *codec, unsigned int res)
 {
@@ -1166,8 +1166,8 @@ static void hdmi_intrinsic_event(struct hda_codec *codec, unsigned int res)
         if (pin_idx < 0)
                 return;
 
-        hdmi_present_sense(get_pin(spec, pin_idx), 1);
-        snd_hda_jack_report_sync(codec);
+        if (hdmi_present_sense(get_pin(spec, pin_idx), 1))
+                snd_hda_jack_report_sync(codec);
 }
 
 static void hdmi_non_intrinsic_event(struct hda_codec *codec, unsigned int res)
@@ -1475,7 +1475,7 @@ static int hdmi_read_pin_conn(struct hda_codec *codec, int pin_idx)
         return 0;
 }
 
-static void hdmi_present_sense(struct hdmi_spec_per_pin *per_pin, int repoll)
+static bool hdmi_present_sense(struct hdmi_spec_per_pin *per_pin, int repoll)
 {
         struct hda_codec *codec = per_pin->codec;
         struct hdmi_spec *spec = codec->spec;
@@ -1493,6 +1493,7 @@ static void hdmi_present_sense(struct hdmi_spec_per_pin *per_pin, int repoll)
         int present = snd_hda_pin_sense(codec, pin_nid);
         bool update_eld = false;
         bool eld_changed = false;
+        bool ret;
 
         mutex_lock(&per_pin->lock);
         pin_eld->monitor_present = !!(present & AC_PINSENSE_PRESENCE);
@@ -1559,7 +1560,12 @@ static void hdmi_present_sense(struct hdmi_spec_per_pin *per_pin, int repoll)
                                SNDRV_CTL_EVENT_MASK_VALUE | SNDRV_CTL_EVENT_MASK_INFO,
                                &per_pin->eld_ctl->id);
  unlock:
+        if ((codec->vendor_id & 0xffff0000) == 0x10020000)
+                ret = true; /* AMD codecs create ELD by itself */
+        else
+                ret = !repoll || !pin_eld->monitor_present || pin_eld->eld_valid;
         mutex_unlock(&per_pin->lock);
+        return ret;
 }
 
 static void hdmi_repoll_eld(struct work_struct *work)
@@ -1570,7 +1576,8 @@ static void hdmi_repoll_eld(struct work_struct *work)
         if (per_pin->repoll_count++ > 6)
                 per_pin->repoll_count = 0;
 
-        hdmi_present_sense(per_pin, per_pin->repoll_count);
+        if (hdmi_present_sense(per_pin, per_pin->repoll_count))
+                snd_hda_jack_report_sync(per_pin->codec);
 }
 
 static void intel_haswell_fixup_connect_list(struct hda_codec *codec,