* [PATCH v2 1/3] ALSA: Add documentation about HD-audio DP MST
2016-01-12 3:13 [PATCH v2 0/3] ALSA: hda - hdmi jack support for dynamic pcm assignment libin.yang
@ 2016-01-12 3:13 ` libin.yang
2016-01-12 3:13 ` [PATCH v2 2/3] ALSA: hda - add hdmi_pcm to manage hdmi pcm related features libin.yang
` (2 subsequent siblings)
3 siblings, 0 replies; 6+ messages in thread
From: libin.yang @ 2016-01-12 3:13 UTC (permalink / raw)
To: alsa-devel, tiwai; +Cc: libin.yang, mengdong.lin, Libin Yang
From: Libin Yang <libin.yang@linux.intel.com>
Add the documentation about HD-audio DP MST:
1. Overview
2. Jack
Others will be added later.
Signed-off-by: Libin Yang <libin.yang@linux.intel.com>
---
Documentation/sound/alsa/HD-Audio-DP-MST-audio.txt | 74 ++++++++++++++++++++++
1 file changed, 74 insertions(+)
create mode 100644 Documentation/sound/alsa/HD-Audio-DP-MST-audio.txt
diff --git a/Documentation/sound/alsa/HD-Audio-DP-MST-audio.txt b/Documentation/sound/alsa/HD-Audio-DP-MST-audio.txt
new file mode 100644
index 0000000..82744ac
--- /dev/null
+++ b/Documentation/sound/alsa/HD-Audio-DP-MST-audio.txt
@@ -0,0 +1,74 @@
+To support DP MST audio, HD Audio hdmi codec driver introduces virtual pin
+and dynamic pcm assignment.
+
+Virtual pin is an extension of per_pin. The most difference of DP MST
+from legacy is that DP MST introduces device entry. Each pin can contain
+several device entries. Each device entry behaves as a pin.
+
+As each pin may contain several device entries and each codec may contain
+several pins, if we use one pcm per per_pin, there will be many PCMs.
+The new solution is to create a few PCMs and to dynamically bind pcm to
+per_pin. Driver uses spec->dyn_pcm_assign flag to indicate whether to use
+the new solution.
+
+PCM
+===
+To be added
+
+
+Jack
+====
+
+Presume:
+ - MST must be dyn_pcm_assign, and it is acomp (for Intel scenario);
+ - NON-MST may or may not be dyn_pcm_assign, it can be acomp or !acomp;
+
+So there are the following scenarios:
+ a. MST (&& dyn_pcm_assign && acomp)
+ b. NON-MST && dyn_pcm_assign && acomp
+ c. NON-MST && !dyn_pcm_assign && !acomp
+
+Below discussion will ignore MST and NON-MST difference as it doesn't
+impact on jack handling too much.
+
+Driver uses struct hdmi_pcm pcm[] array in hdmi_spec and snd_jack is
+a member of hdmi_pcm. Each pin has one struct hdmi_pcm * pcm pointer.
+
+For !dyn_pcm_assign, per_pin->pcm will assigned to spec->pcm[n] statically.
+
+For dyn_pcm_assign, per_pin->pcm will assigned to spec->pcm[n]
+when monitor is hotplugged.
+
+
+Build Jack
+----------
+
+- dyn_pcm_assign
+Will not use hda_jack but use snd_jack in spec->pcm_rec[pcm_idx].jack directly.
+
+- !dyn_pcm_assign
+Use hda_jack and assign spec->pcm_rec[pcm_idx].jack = jack->jack statically.
+
+
+Unsolicited Event Enabling
+--------------------------
+Enable unsolicited event if !acomp.
+
+
+Monitor Hotplug Event Handling
+------------------------------
+- acomp
+pin_eld_notify() -> check_presence_and_report() -> hdmi_present_sense() ->
+sync_eld_via_acomp().
+Use directly snd_jack_report() on spec->pcm_rec[pcm_idx].jack for
+both dyn_pcm_assign and !dyn_pcm_assign
+
+- !acomp
+Hdmi_unsol_event() -> hdmi_intrinsic_event() -> check_presence_and_report() ->
+hdmi_present_sense() -> hdmi_prepsent_sense_via_verbs()
+Use directly snd_jack_report() on spec->pcm_rec[pcm_idx].jack for dyn_pcm_assign.
+Use hda_jack mechanism to handle jack events.
+
+
+Others to be added later
+========================
--
1.9.1
^ permalink raw reply related [flat|nested] 6+ messages in thread* [PATCH v2 2/3] ALSA: hda - add hdmi_pcm to manage hdmi pcm related features
2016-01-12 3:13 [PATCH v2 0/3] ALSA: hda - hdmi jack support for dynamic pcm assignment libin.yang
2016-01-12 3:13 ` [PATCH v2 1/3] ALSA: Add documentation about HD-audio DP MST libin.yang
@ 2016-01-12 3:13 ` libin.yang
2016-01-12 3:13 ` [PATCH v2 3/3] ALSA: hda - hdmi jack created based on pcm libin.yang
2016-01-12 6:21 ` [PATCH v2 0/3] ALSA: hda - hdmi jack support for dynamic pcm assignment Takashi Iwai
3 siblings, 0 replies; 6+ messages in thread
From: libin.yang @ 2016-01-12 3:13 UTC (permalink / raw)
To: alsa-devel, tiwai; +Cc: libin.yang, mengdong.lin, Libin Yang
From: Libin Yang <libin.yang@linux.intel.com>
Use struct hdmi_pcm wrapper for hdmi pcm management.
All PCM related features, like jack, will be put in this structure.
Signed-off-by: Libin Yang <libin.yang@linux.intel.com>
---
sound/pci/hda/patch_hdmi.c | 39 +++++++++++++++++++++++----------------
1 file changed, 23 insertions(+), 16 deletions(-)
diff --git a/sound/pci/hda/patch_hdmi.c b/sound/pci/hda/patch_hdmi.c
index 6d6dba4..3b8d651 100644
--- a/sound/pci/hda/patch_hdmi.c
+++ b/sound/pci/hda/patch_hdmi.c
@@ -86,7 +86,7 @@ struct hdmi_spec_per_pin {
struct delayed_work work;
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*/
+ struct hdmi_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 */
@@ -132,6 +132,11 @@ struct hdmi_ops {
int (*chmap_validate)(int ca, int channels, unsigned char *chmap);
};
+struct hdmi_pcm {
+ struct hda_pcm *pcm;
+ struct snd_jack *jack;
+};
+
struct hdmi_spec {
int num_cvts;
struct snd_array cvts; /* struct hdmi_spec_per_cvt */
@@ -139,7 +144,7 @@ struct hdmi_spec {
int num_pins;
struct snd_array pins; /* struct hdmi_spec_per_pin */
- struct hda_pcm *pcm_rec[16];
+ struct hdmi_pcm pcm_rec[16];
struct mutex pcm_lock;
/* pcm_bitmap means which pcms have been assigned to pins*/
unsigned long pcm_bitmap;
@@ -381,7 +386,10 @@ static struct cea_channel_speaker_allocation channel_allocations[] = {
((struct hdmi_spec_per_pin *)snd_array_elem(&spec->pins, idx))
#define get_cvt(spec, idx) \
((struct hdmi_spec_per_cvt *)snd_array_elem(&spec->cvts, idx))
-#define get_pcm_rec(spec, idx) ((spec)->pcm_rec[idx])
+/* obtain hdmi_pcm object assigned to idx */
+#define get_hdmi_pcm(spec, idx) (&(spec)->pcm_rec[idx])
+/* obtain hda_pcm object assigned to idx */
+#define get_pcm_rec(spec, idx) (get_hdmi_pcm(spec, idx)->pcm)
static int pin_nid_to_pin_index(struct hda_codec *codec, hda_nid_t pin_nid)
{
@@ -419,7 +427,8 @@ static int hinfo_to_pin_index(struct hda_codec *codec,
for (pin_idx = 0; pin_idx < spec->num_pins; pin_idx++) {
per_pin = get_pin(spec, pin_idx);
- if (per_pin->pcm && per_pin->pcm->stream == hinfo)
+ if (per_pin->pcm &&
+ per_pin->pcm->pcm->stream == hinfo)
return pin_idx;
}
@@ -1721,7 +1730,7 @@ static void hdmi_attach_hda_pcm(struct hdmi_spec *spec,
if (idx == -ENODEV)
return;
per_pin->pcm_idx = idx;
- per_pin->pcm = spec->pcm_rec[idx];
+ per_pin->pcm = get_hdmi_pcm(spec, idx);
set_bit(idx, &spec->pcm_bitmap);
}
@@ -1764,7 +1773,7 @@ static void hdmi_pcm_setup_pin(struct hdmi_spec *spec,
bool non_pcm;
if (per_pin->pcm_idx >= 0 && per_pin->pcm_idx < spec->pcm_used)
- pcm = spec->pcm_rec[per_pin->pcm_idx];
+ pcm = get_pcm_rec(spec, per_pin->pcm_idx);
else
return;
if (!test_bit(per_pin->pcm_idx, &spec->pcm_in_use))
@@ -2028,8 +2037,10 @@ static int hdmi_add_pin(struct hda_codec *codec, hda_nid_t pin_nid)
per_pin->non_pcm = false;
if (spec->dyn_pcm_assign)
per_pin->pcm_idx = -1;
- else
+ else {
+ per_pin->pcm = get_hdmi_pcm(spec, pin_idx);
per_pin->pcm_idx = pin_idx;
+ }
per_pin->pin_nid_idx = pin_idx;
err = hdmi_read_pin_conn(codec, pin_idx);
@@ -2439,7 +2450,6 @@ static int hdmi_chmap_ctl_put(struct snd_kcontrol *kcontrol,
static int generic_hdmi_build_pcms(struct hda_codec *codec)
{
struct hdmi_spec *spec = codec->spec;
- struct hdmi_spec_per_pin *per_pin;
int pin_idx;
for (pin_idx = 0; pin_idx < spec->num_pins; pin_idx++) {
@@ -2449,11 +2459,8 @@ static int generic_hdmi_build_pcms(struct hda_codec *codec)
info = snd_hda_codec_pcm_new(codec, "HDMI %d", pin_idx);
if (!info)
return -ENOMEM;
- if (!spec->dyn_pcm_assign) {
- per_pin = get_pin(spec, pin_idx);
- per_pin->pcm = info;
- }
- spec->pcm_rec[pin_idx] = info;
+
+ spec->pcm_rec[pin_idx].pcm = info;
spec->pcm_used++;
info->pcm_type = HDA_PCM_TYPE_HDMI;
info->own_chmap = true;
@@ -2536,7 +2543,7 @@ static int generic_hdmi_build_controls(struct hda_codec *codec)
/* add control for ELD Bytes */
err = hdmi_create_eld_ctl(codec, pin_idx,
- get_pcm_rec(spec, pin_idx)->device);
+ get_pcm_rec(spec, pin_idx)->device);
if (err < 0)
return err;
@@ -2551,7 +2558,7 @@ static int generic_hdmi_build_controls(struct hda_codec *codec)
struct snd_kcontrol *kctl;
int i;
- pcm = spec->pcm_rec[pin_idx];
+ pcm = get_pcm_rec(spec, pin_idx);
if (!pcm || !pcm->pcm)
break;
err = snd_pcm_add_chmap_ctls(pcm->pcm,
@@ -2857,7 +2864,7 @@ static int simple_playback_build_pcms(struct hda_codec *codec)
info = snd_hda_codec_pcm_new(codec, "HDMI 0");
if (!info)
return -ENOMEM;
- spec->pcm_rec[0] = info;
+ spec->pcm_rec[0].pcm = info;
info->pcm_type = HDA_PCM_TYPE_HDMI;
pstr = &info->stream[SNDRV_PCM_STREAM_PLAYBACK];
*pstr = spec->pcm_playback;
--
1.9.1
^ permalink raw reply related [flat|nested] 6+ messages in thread* [PATCH v2 3/3] ALSA: hda - hdmi jack created based on pcm
2016-01-12 3:13 [PATCH v2 0/3] ALSA: hda - hdmi jack support for dynamic pcm assignment libin.yang
2016-01-12 3:13 ` [PATCH v2 1/3] ALSA: Add documentation about HD-audio DP MST libin.yang
2016-01-12 3:13 ` [PATCH v2 2/3] ALSA: hda - add hdmi_pcm to manage hdmi pcm related features libin.yang
@ 2016-01-12 3:13 ` libin.yang
2016-01-12 6:21 ` [PATCH v2 0/3] ALSA: hda - hdmi jack support for dynamic pcm assignment Takashi Iwai
3 siblings, 0 replies; 6+ messages in thread
From: libin.yang @ 2016-01-12 3:13 UTC (permalink / raw)
To: alsa-devel, tiwai; +Cc: libin.yang, mengdong.lin, Libin Yang
From: Libin Yang <libin.yang@linux.intel.com>
Jack is created based on pcm.
Apply the acomp jack rule to dyn_pcm_assign.
For dyn_pcm_assign:
Driver does not use hda_jack. It operates snd_jack directly.
snd_jack pointer will be stored in spec->pcm.jack instead of
the current spec->acomp_jack. When pcm is assigned to pin,
jack will be assigned to pin automatically.
For !dyn_pcm_assign:
Driver continues using hda_jack for less impact on the old cases.
Pcm is statically assigned to pin. So is jack. spec->pcm.jack
saves the snd_jack pointer created in hda_jack.
Signed-off-by: Libin Yang <libin.yang@linux.intel.com>
---
sound/pci/hda/patch_hdmi.c | 93 +++++++++++++++++++++++++++++++++-------------
1 file changed, 67 insertions(+), 26 deletions(-)
diff --git a/sound/pci/hda/patch_hdmi.c b/sound/pci/hda/patch_hdmi.c
index 3b8d651..dfb7c26 100644
--- a/sound/pci/hda/patch_hdmi.c
+++ b/sound/pci/hda/patch_hdmi.c
@@ -85,7 +85,6 @@ struct hdmi_spec_per_pin {
struct mutex lock;
struct delayed_work work;
struct snd_kcontrol *eld_ctl;
- struct snd_jack *acomp_jack; /* jack via audio component */
struct hdmi_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;
@@ -1946,6 +1945,7 @@ 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;
int size;
mutex_lock(&per_pin->lock);
@@ -1969,8 +1969,17 @@ static void sync_eld_via_acomp(struct hda_codec *codec,
eld->eld_size = 0;
}
+ /* pcm_idx >=0 before update_eld() means it is in monitor
+ * disconnected event. Jack must be fetched before update_eld()
+ */
+ if (per_pin->pcm_idx >= 0)
+ jack = spec->pcm_rec[per_pin->pcm_idx].jack;
update_eld(codec, per_pin, eld);
- snd_jack_report(per_pin->acomp_jack,
+ if (jack == NULL && per_pin->pcm_idx >= 0)
+ jack = spec->pcm_rec[per_pin->pcm_idx].jack;
+ if (jack == NULL)
+ goto unlock;
+ snd_jack_report(jack,
eld->monitor_present ? SND_JACK_AVOUT : 0);
unlock:
mutex_unlock(&per_pin->lock);
@@ -2474,15 +2483,16 @@ static int generic_hdmi_build_pcms(struct hda_codec *codec)
return 0;
}
-static void free_acomp_jack_priv(struct snd_jack *jack)
+static void free_hdmi_jack_priv(struct snd_jack *jack)
{
- struct hdmi_spec_per_pin *per_pin = jack->private_data;
+ struct hdmi_pcm *pcm = jack->private_data;
- per_pin->acomp_jack = NULL;
+ pcm->jack = NULL;
}
-static int add_acomp_jack_kctl(struct hda_codec *codec,
- struct hdmi_spec_per_pin *per_pin,
+static int add_hdmi_jack_kctl(struct hda_codec *codec,
+ struct hdmi_spec *spec,
+ int pcm_idx,
const char *name)
{
struct snd_jack *jack;
@@ -2492,45 +2502,68 @@ static int add_acomp_jack_kctl(struct hda_codec *codec,
true, false);
if (err < 0)
return err;
- per_pin->acomp_jack = jack;
- jack->private_data = per_pin;
- jack->private_free = free_acomp_jack_priv;
+
+ spec->pcm_rec[pcm_idx].jack = jack;
+ jack->private_data = &spec->pcm_rec[pcm_idx];
+ jack->private_free = free_hdmi_jack_priv;
return 0;
}
-static int generic_hdmi_build_jack(struct hda_codec *codec, int pin_idx)
+static int generic_hdmi_build_jack(struct hda_codec *codec, int pcm_idx)
{
char hdmi_str[32] = "HDMI/DP";
struct hdmi_spec *spec = codec->spec;
- struct hdmi_spec_per_pin *per_pin = get_pin(spec, pin_idx);
- int pcmdev = get_pcm_rec(spec, pin_idx)->device;
+ struct hdmi_spec_per_pin *per_pin;
+ struct hda_jack_tbl *jack;
+ int pcmdev = get_pcm_rec(spec, pcm_idx)->device;
bool phantom_jack;
+ int ret;
if (pcmdev > 0)
sprintf(hdmi_str + strlen(hdmi_str), ",pcm=%d", pcmdev);
- if (codec_has_acomp(codec))
- return add_acomp_jack_kctl(codec, per_pin, hdmi_str);
+
+ if (spec->dyn_pcm_assign)
+ return add_hdmi_jack_kctl(codec, spec, pcm_idx, hdmi_str);
+
+ /* for !dyn_pcm_assign, we still use hda_jack for compatibility */
+ /* if !dyn_pcm_assign, it must be non-MST mode.
+ * This means pcms and pins are statically mapped.
+ * And pcm_idx is pin_idx.
+ */
+ per_pin = get_pin(spec, pcm_idx);
phantom_jack = !is_jack_detectable(codec, per_pin->pin_nid);
if (phantom_jack)
strncat(hdmi_str, " Phantom",
sizeof(hdmi_str) - strlen(hdmi_str) - 1);
-
- return snd_hda_jack_add_kctl(codec, per_pin->pin_nid, hdmi_str,
- phantom_jack);
+ ret = snd_hda_jack_add_kctl(codec, per_pin->pin_nid, hdmi_str,
+ phantom_jack);
+ if (ret < 0)
+ return ret;
+ jack = snd_hda_jack_tbl_get(codec, per_pin->pin_nid);
+ if (jack == NULL)
+ return 0;
+ /* assign jack->jack to pcm_rec[].jack to
+ * align with dyn_pcm_assign mode
+ */
+ spec->pcm_rec[pcm_idx].jack = jack->jack;
+ return 0;
}
static int generic_hdmi_build_controls(struct hda_codec *codec)
{
struct hdmi_spec *spec = codec->spec;
int err;
- int pin_idx;
+ int pin_idx, pcm_idx;
- for (pin_idx = 0; pin_idx < spec->num_pins; pin_idx++) {
- struct hdmi_spec_per_pin *per_pin = get_pin(spec, pin_idx);
- err = generic_hdmi_build_jack(codec, pin_idx);
+ for (pcm_idx = 0; pcm_idx < spec->pcm_used; pcm_idx++) {
+ err = generic_hdmi_build_jack(codec, pcm_idx);
if (err < 0)
return err;
+ }
+
+ for (pin_idx = 0; pin_idx < spec->num_pins; pin_idx++) {
+ struct hdmi_spec_per_pin *per_pin = get_pin(spec, pin_idx);
err = snd_hda_create_dig_out_ctls(codec,
per_pin->pin_nid,
@@ -2629,18 +2662,25 @@ static void hdmi_array_free(struct hdmi_spec *spec)
static void generic_hdmi_free(struct hda_codec *codec)
{
struct hdmi_spec *spec = codec->spec;
- int pin_idx;
+ int pin_idx, pcm_idx;
if (codec_has_acomp(codec))
snd_hdac_i915_register_notifier(NULL);
for (pin_idx = 0; pin_idx < spec->num_pins; pin_idx++) {
struct hdmi_spec_per_pin *per_pin = get_pin(spec, pin_idx);
-
cancel_delayed_work_sync(&per_pin->work);
eld_proc_free(per_pin);
- if (per_pin->acomp_jack)
- snd_device_free(codec->card, per_pin->acomp_jack);
+ }
+
+ for (pcm_idx = 0; pcm_idx < spec->pcm_used; pcm_idx++) {
+ if (spec->pcm_rec[pcm_idx].jack == NULL)
+ continue;
+ if (spec->dyn_pcm_assign)
+ snd_device_free(codec->card,
+ spec->pcm_rec[pcm_idx].jack);
+ else
+ spec->pcm_rec[pcm_idx].jack = NULL;
}
if (spec->i915_bound)
@@ -2842,6 +2882,7 @@ static int patch_generic_hdmi(struct hda_codec *codec)
init_channel_allocations();
+ WARN_ON(spec->dyn_pcm_assign && !codec_has_acomp(codec));
return 0;
}
--
1.9.1
^ permalink raw reply related [flat|nested] 6+ messages in thread* Re: [PATCH v2 0/3] ALSA: hda - hdmi jack support for dynamic pcm assignment
2016-01-12 3:13 [PATCH v2 0/3] ALSA: hda - hdmi jack support for dynamic pcm assignment libin.yang
` (2 preceding siblings ...)
2016-01-12 3:13 ` [PATCH v2 3/3] ALSA: hda - hdmi jack created based on pcm libin.yang
@ 2016-01-12 6:21 ` Takashi Iwai
2016-01-12 7:10 ` Yang, Libin
3 siblings, 1 reply; 6+ messages in thread
From: Takashi Iwai @ 2016-01-12 6:21 UTC (permalink / raw)
To: libin.yang; +Cc: libin.yang, mengdong.lin, alsa-devel
On Tue, 12 Jan 2016 04:13:24 +0100,
libin.yang@linux.intel.com wrote:
>
> From: Libin Yang <libin.yang@linux.intel.com>
>
> The patchset adds hdmi jack support for dynamic pcm assignment
>
> Libin Yang (3):
> ALSA: Add documentation about HD-audio DP MST
> ALSA: hda - add hdmi_pcm to manage hdmi pcm related features
> ALSA: hda - hdmi jack created based on pcm
I merged these three patches to topic/hda-mst branch now.
But, since the MST audio support itself is still incomplete in i915
side, I postpone this merge to for-next for 4.5 kernel, at least.
Let's get it working for 4.6.
thanks,
Takashi
^ permalink raw reply [flat|nested] 6+ messages in thread* Re: [PATCH v2 0/3] ALSA: hda - hdmi jack support for dynamic pcm assignment
2016-01-12 6:21 ` [PATCH v2 0/3] ALSA: hda - hdmi jack support for dynamic pcm assignment Takashi Iwai
@ 2016-01-12 7:10 ` Yang, Libin
0 siblings, 0 replies; 6+ messages in thread
From: Yang, Libin @ 2016-01-12 7:10 UTC (permalink / raw)
To: Takashi Iwai, libin.yang@linux.intel.com
Cc: Lin, Mengdong, alsa-devel@alsa-project.org
Hi Takashi,
> -----Original Message-----
> From: Takashi Iwai [mailto:tiwai@suse.de]
> Sent: Tuesday, January 12, 2016 2:21 PM
> To: libin.yang@linux.intel.com
> Cc: alsa-devel@alsa-project.org; Lin, Mengdong; Yang, Libin
> Subject: Re: [alsa-devel] [PATCH v2 0/3] ALSA: hda - hdmi jack support
> for dynamic pcm assignment
>
> On Tue, 12 Jan 2016 04:13:24 +0100,
> libin.yang@linux.intel.com wrote:
> >
> > From: Libin Yang <libin.yang@linux.intel.com>
> >
> > The patchset adds hdmi jack support for dynamic pcm assignment
> >
> > Libin Yang (3):
> > ALSA: Add documentation about HD-audio DP MST
> > ALSA: hda - add hdmi_pcm to manage hdmi pcm related features
> > ALSA: hda - hdmi jack created based on pcm
>
> I merged these three patches to topic/hda-mst branch now.
> But, since the MST audio support itself is still incomplete in i915
> side, I postpone this merge to for-next for 4.5 kernel, at least.
> Let's get it working for 4.6.
Get it. Thanks. And I will initialize a discussion with gfx team
about how to support DP MST audio later.
Regards,
Libin
>
>
> thanks,
>
> Takashi
^ permalink raw reply [flat|nested] 6+ messages in thread