ALSA: hda - delayed ELD repoll

The Intel HDMI chips (ironlake at least) are found to have ~250ms delay
between the ELD_Valid=1 hotplug event is send and the ELD buffer becomes
actually readable. During the time the ELD buffer is mysteriously all 0.

Fix it by scheduling a delayed work to re-read ELD buffer after 300ms.

Signed-off-by: Wu Fengguang <fengguang.wu@intel.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>

diff --git a/sound/pci/hda/patch_hdmi.c b/sound/pci/hda/patch_hdmi.c
index aebfee50bd88bc727f0952fb8173300b3964ce42..a76139b6015427e00d7c68bc48b3cabd75828665 100644 (file)
--- a/sound/pci/hda/patch_hdmi.c
+++ b/sound/pci/hda/patch_hdmi.c
@@ -65,7 +65,10 @@ struct hdmi_spec_per_pin {
        hda_nid_t pin_nid;
        int num_mux_nids;
        hda_nid_t mux_nids[HDA_MAX_CONNECTIONS];
+
+       struct hda_codec *codec;
        struct hdmi_eld sink_eld;
+       struct delayed_work work;
 };
 
 struct hdmi_spec {
@@ -745,8 +748,7 @@ static void hdmi_setup_audio_infoframe(struct hda_codec *codec, int pin_idx,
  * Unsolicited events
  */
 
-static void hdmi_present_sense(struct hda_codec *codec, hda_nid_t pin_nid,
-                              struct hdmi_eld *eld);
+static void hdmi_present_sense(struct hdmi_spec_per_pin *per_pin, bool retry);
 
 static void hdmi_intrinsic_event(struct hda_codec *codec, unsigned int res)
 {
@@ -766,7 +768,7 @@ static void hdmi_intrinsic_event(struct hda_codec *codec, unsigned int res)
                return;
        eld = &spec->pins[pin_idx].sink_eld;
 
-       hdmi_present_sense(codec, pin_nid, eld);
+       hdmi_present_sense(&spec->pins[pin_idx], true);
 
        /*
         * HDMI sink's ELD info cannot always be retrieved for now, e.g.
@@ -968,9 +970,11 @@ static int hdmi_read_pin_conn(struct hda_codec *codec, int pin_idx)
        return 0;
 }
 
-static void hdmi_present_sense(struct hda_codec *codec, hda_nid_t pin_nid,
-                              struct hdmi_eld *eld)
+static void hdmi_present_sense(struct hdmi_spec_per_pin *per_pin, bool retry)
 {
+       struct hda_codec *codec = per_pin->codec;
+       struct hdmi_eld *eld = &per_pin->sink_eld;
+       hda_nid_t pin_nid = per_pin->pin_nid;
        /*
         * Always execute a GetPinSense verb here, even when called from
         * hdmi_intrinsic_event; for some NVIDIA HW, the unsolicited
@@ -992,13 +996,27 @@ static void hdmi_present_sense(struct hda_codec *codec, hda_nid_t pin_nid,
                "HDMI status: Codec=%d Pin=%d Presence_Detect=%d ELD_Valid=%d\n",
                codec->addr, pin_nid, eld->monitor_present, eld_valid);
 
-       if (eld_valid)
+       if (eld_valid) {
                if (!snd_hdmi_get_eld(eld, codec, pin_nid))
                        snd_hdmi_show_eld(eld);
+               else if (retry) {
+                       queue_delayed_work(codec->bus->workq,
+                                          &per_pin->work,
+                                          msecs_to_jiffies(300));
+               }
+       }
 
        snd_hda_input_jack_report(codec, pin_nid);
 }
 
+static void hdmi_repoll_eld(struct work_struct *work)
+{
+       struct hdmi_spec_per_pin *per_pin =
+       container_of(to_delayed_work(work), struct hdmi_spec_per_pin, work);
+
+       hdmi_present_sense(per_pin, false);
+}
+
 static int hdmi_add_pin(struct hda_codec *codec, hda_nid_t pin_nid)
 {
        struct hdmi_spec *spec = codec->spec;
@@ -1227,7 +1245,7 @@ static int generic_hdmi_build_jack(struct hda_codec *codec, int pin_idx)
        if (err < 0)
                return err;
 
-       hdmi_present_sense(codec, per_pin->pin_nid, &per_pin->sink_eld);
+       hdmi_present_sense(per_pin, false);
        return 0;
 }
 
@@ -1278,6 +1296,8 @@ static int generic_hdmi_init(struct hda_codec *codec)
                                    AC_VERB_SET_UNSOLICITED_ENABLE,
                                    AC_USRSP_EN | pin_nid);
 
+               per_pin->codec = codec;
+               INIT_DELAYED_WORK(&per_pin->work, hdmi_repoll_eld);
                snd_hda_eld_proc_new(codec, eld, pin_idx);
        }
        return 0;
@@ -1292,10 +1312,12 @@ static void generic_hdmi_free(struct hda_codec *codec)
                struct hdmi_spec_per_pin *per_pin = &spec->pins[pin_idx];
                struct hdmi_eld *eld = &per_pin->sink_eld;
 
+               cancel_delayed_work(&per_pin->work);
                snd_hda_eld_proc_free(codec, eld);
        }
        snd_hda_input_jack_free(codec);
 
+       flush_workqueue(codec->bus->workq);
        kfree(spec);
 }