From: Libin Yang libin.yang@linux.intel.com

Dynamically bind/unbind the PCM to pin when HDMI/DP monitor hotplug.

When monitor is connected, find a proper PCM for the monitor. When monitor is disconnected, unbind the PCM from the pin.

The binding policy (use Intel platform as example) is: 1. Try to use the legacy pin-pcm mapping for the device entry 0 of the pin. 2. If step 1 fails, try to bind pin to the backup PCMs. For example, on Intel platform, if DP MST is enabled, 5 PCMs will be created. PCM 3, PCM 7, PCM 8 are supposed to be used by device entry 0 of pin 5, pin 6 and pin 7. PCM 9 and PCM 10 are the backup PCMs. 3. If step 2 fails, try to find any PCM to bind to the pin.

Signed-off-by: Libin Yang libin.yang@linux.intel.com --- sound/pci/hda/patch_hdmi.c | 82 ++++++++++++++++++++++++++++++++++++++++++++-- 1 file changed, 80 insertions(+), 2 deletions(-)

diff --git a/sound/pci/hda/patch_hdmi.c b/sound/pci/hda/patch_hdmi.c index 19bf782..56b7625 100644 --- a/sound/pci/hda/patch_hdmi.c +++ b/sound/pci/hda/patch_hdmi.c @@ -73,6 +73,8 @@ struct hdmi_spec_per_cvt {

struct hdmi_spec_per_pin { hda_nid_t pin_nid; + /* pin idx, different device entries on the same pin use the same idx */ + int pin_nid_idx; int num_mux_nids; hda_nid_t mux_nids[HDA_MAX_CONNECTIONS]; int mux_idx; @@ -85,6 +87,7 @@ struct hdmi_spec_per_pin { struct snd_kcontrol *eld_ctl; struct snd_jack *acomp_jack; /* jack via audio component */ struct hda_pcm *pcm; /* pointer to spec->pcm_rec[n] dynamically*/ + int pcm_idx; /* which pcm is attached. -1 means no pcm is attached */ int repoll_count; bool setup; /* the stream has been set up by prepare callback */ int channels; /* current number of channels */ @@ -138,6 +141,8 @@ struct hdmi_spec { struct snd_array pins; /* struct hdmi_spec_per_pin */ struct hda_pcm *pcm_rec[16]; struct mutex pcm_lock; + /* pcm_bitmap means which pcms have been assigned to pins*/ + unsigned long pcm_bitmap; int pcm_used; /* counter of pcm_rec[] */ unsigned int channels_max; /* max over all cvts */

@@ -1671,6 +1676,60 @@ static int hdmi_read_pin_conn(struct hda_codec *codec, int pin_idx) return 0; }

+static int hdmi_find_pcm_slot(struct hdmi_spec *spec, + struct hdmi_spec_per_pin *per_pin) +{ + int i; + + /* try the prefer PCM */ + if (!test_bit(per_pin->pin_nid_idx, &spec->pcm_bitmap)) + return per_pin->pin_nid_idx; + + /* have a second try; check the "reserved area" over num_pins */ + for (i = spec->num_pins; i < spec->pcm_used; i++) { + if (!test_bit(i, &spec->pcm_bitmap)) + return i; + } + + /* the last try; check the empty slots in pins */ + for (i = 0; i < spec->num_pins; i++) { + if (!test_bit(i, &spec->pcm_bitmap)) + return i; + } + return -EBUSY; +} + +static void hdmi_attach_hda_pcm(struct hdmi_spec *spec, + struct hdmi_spec_per_pin *per_pin) +{ + int idx; + + /* pcm already be attached to the pin */ + if (per_pin->pcm) + return; + idx = hdmi_find_pcm_slot(spec, per_pin); + if (idx == -ENODEV) + return; + per_pin->pcm_idx = idx; + per_pin->pcm = spec->pcm_rec[idx]; + set_bit(idx, &spec->pcm_bitmap); +} + +static void hdmi_detach_hda_pcm(struct hdmi_spec *spec, + struct hdmi_spec_per_pin *per_pin) +{ + int idx; + + /* pcm already be detached from the pin */ + if (!per_pin->pcm) + return; + idx = per_pin->pcm_idx; + per_pin->pcm_idx = -1; + per_pin->pcm = NULL; + if (idx >= 0 && idx < spec->pcm_used) + clear_bit(idx, &spec->pcm_bitmap); +} + /* update per_pin ELD from the given new ELD; * setup info frame and notification accordingly */ @@ -1679,9 +1738,17 @@ static void update_eld(struct hda_codec *codec, struct hdmi_eld *eld) { struct hdmi_eld *pin_eld = &per_pin->sink_eld; + struct hdmi_spec *spec = codec->spec; bool old_eld_valid = pin_eld->eld_valid; bool eld_changed;

+ if (spec->dyn_pcm_assign) { + if (eld->eld_valid) + hdmi_attach_hda_pcm(spec, per_pin); + else + hdmi_detach_hda_pcm(spec, per_pin); + } + if (eld->eld_valid) snd_hdmi_show_eld(codec, &eld->info);

@@ -1825,13 +1892,19 @@ static void sync_eld_via_acomp(struct hda_codec *codec, 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; + int ret;

+ mutex_lock(&spec->pcm_lock); if (codec_has_acomp(codec)) { sync_eld_via_acomp(codec, per_pin); - return false; /* don't call snd_hda_jack_report_sync() */ + ret = false; /* don't call snd_hda_jack_report_sync() */ } else { - return hdmi_present_sense_via_verbs(per_pin, repoll); + ret = hdmi_present_sense_via_verbs(per_pin, repoll); } + mutex_unlock(&spec->pcm_lock); + + return ret; }

static void hdmi_repoll_eld(struct work_struct *work) @@ -1875,6 +1948,11 @@ static int hdmi_add_pin(struct hda_codec *codec, hda_nid_t pin_nid)

per_pin->pin_nid = pin_nid; per_pin->non_pcm = false; + if (spec->dyn_pcm_assign) + per_pin->pcm_idx = -1; + else + per_pin->pcm_idx = pin_idx; + per_pin->pin_nid_idx = pin_idx;

err = hdmi_read_pin_conn(codec, pin_idx); if (err < 0)