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ALSA: HDA: Unify HDMI hotplug handling.
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This change unifies the initial handling of a pin's state with the code to
update a pin's state after a hotplug (unsolicited response) event. The
initial probing, and all updates, are now routed through hdmi_present_sense.

The stored PD and ELDV status is now always derived from GetPinSense verb
execution, and not from the data in the unsolicited response. This means:

a) The WAR for NVIDIA codec's UR.PD values ("old_pin_detect") can be
   removed, since this only affected the no-longer-used unsolicited
   response payload.

b) In turn, this means that most NVIDIA codecs can simply use
   patch_generic_hdmi instead of having a custom variant just to set
   old_pin_detect.

c) When PD && ELDV becomes true, no extra verbs are executed, because the
   GetPinSense that was previously executed by snd_hdmi_get_eld (really,
   hdmi_eld_valid) has simply moved into hdmi_present_sense.

d) When PD && ELDV becomes false, there is a single extra GetPinSense verb
   executed for codecs where old_pin_detect wasn't set, i.e. some NVIDIA,
   and all ATI/AMD and Intel codecs. I doubt this will be a performance
   issue.

The new unified code in hdmi_present_sense also ensures that eld->eld_valid
is not set unless eld->monitor_present is also set. This protects against
potential invalid combinations of PD and ELDV received from HW, and
transitively from a graphics driver.

Also, print the derived PD/ELDV bits from hdmi_present_sense so the kernel
log always displays the actual state stored, which will differ from the
values in the unsolicited response for NVIDIA HW where old_pin_detect was
previously set.

Finally, a couple of small tweaks originally by Takashi:

* Clear the ELD content to zero before reading it, so that if it's not
  read (i.e. when !(PD && ELDV)) it's in a known state.

* Don't show ELD fields in /proc ELD files when the ELD isn't valid.

The only possibility I can see for regression here is a codec where the
GetPinSense verb returns incorrect data. However, we're already exposed
to that, since that data is used (a) from hdmi_add_pin to set up the
initial pin state, and (b) within snd_hda_input_jack_report to query
a pin's presence value. As such, I don't believe any HW has bugs here.

Includes-changes-by: Takashi Iwai <[email protected]>
Signed-off-by: Stephen Warren <[email protected]>
Acked-by: Wu Fengguang <[email protected]>
Signed-off-by: Takashi Iwai <[email protected]>
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@nvswarren @tiwai
nvswarren authored and tiwai committed May 25, 2011
1 parent 4e60b4f commit 5d44f92
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Showing 2 changed files with 52 additions and 87 deletions.
21 changes: 3 additions & 18 deletions sound/pci/hda/hda_eld.c
View file
Original file line number Diff line number Diff line change
Expand Up @@ -312,23 +312,6 @@ static int hdmi_update_eld(struct hdmi_eld *e,
return -EINVAL;
}

static int hdmi_eld_valid(struct hda_codec *codec, hda_nid_t nid)
{
int eldv;
int present;

present = snd_hda_pin_sense(codec, nid);
eldv = (present & AC_PINSENSE_ELDV);
present = (present & AC_PINSENSE_PRESENCE);

#ifdef CONFIG_SND_DEBUG_VERBOSE
printk(KERN_INFO "HDMI: sink_present = %d, eld_valid = %d\n",
!!present, !!eldv);
#endif

return eldv && present;
}

int snd_hdmi_get_eld_size(struct hda_codec *codec, hda_nid_t nid)
{
return snd_hda_codec_read(codec, nid, 0, AC_VERB_GET_HDMI_DIP_SIZE,
Expand All @@ -343,7 +326,7 @@ int snd_hdmi_get_eld(struct hdmi_eld *eld,
int size;
unsigned char *buf;

if (!hdmi_eld_valid(codec, nid))
if (!eld->eld_valid)
return -ENOENT;

size = snd_hdmi_get_eld_size(codec, nid);
Expand Down Expand Up @@ -477,6 +460,8 @@ static void hdmi_print_eld_info(struct snd_info_entry *entry,

snd_iprintf(buffer, "monitor_present\t\t%d\n", e->monitor_present);
snd_iprintf(buffer, "eld_valid\t\t%d\n", e->eld_valid);
if (!e->eld_valid)
return;
snd_iprintf(buffer, "monitor_name\t\t%s\n", e->monitor_name);
snd_iprintf(buffer, "connection_type\t\t%s\n",
eld_connection_type_names[e->conn_type]);
Expand Down
118 changes: 49 additions & 69 deletions sound/pci/hda/patch_hdmi.c
View file
Original file line number Diff line number Diff line change
Expand Up @@ -78,10 +78,6 @@ struct hdmi_spec {
*/
struct hda_multi_out multiout;
const struct hda_pcm_stream *pcm_playback;

/* misc flags */
/* PD bit indicates only the update, not the current state */
unsigned int old_pin_detect:1;
};


Expand Down Expand Up @@ -300,13 +296,6 @@ static int hda_node_index(hda_nid_t *nids, hda_nid_t nid)
return -EINVAL;
}

static void hdmi_get_show_eld(struct hda_codec *codec, hda_nid_t pin_nid,
struct hdmi_eld *eld)
{
if (!snd_hdmi_get_eld(eld, codec, pin_nid))
snd_hdmi_show_eld(eld);
}

#ifdef BE_PARANOID
static void hdmi_get_dip_index(struct hda_codec *codec, hda_nid_t pin_nid,
int *packet_index, int *byte_index)
Expand Down Expand Up @@ -694,35 +683,20 @@ static void hdmi_present_sense(struct hda_codec *codec, hda_nid_t pin_nid,
static void hdmi_intrinsic_event(struct hda_codec *codec, unsigned int res)
{
struct hdmi_spec *spec = codec->spec;
int tag = res >> AC_UNSOL_RES_TAG_SHIFT;
int pind = !!(res & AC_UNSOL_RES_PD);
int pin_nid = res >> AC_UNSOL_RES_TAG_SHIFT;
int pd = !!(res & AC_UNSOL_RES_PD);
int eldv = !!(res & AC_UNSOL_RES_ELDV);
int index;

printk(KERN_INFO
"HDMI hot plug event: Pin=%d Presence_Detect=%d ELD_Valid=%d\n",
tag, pind, eldv);
pin_nid, pd, eldv);

index = hda_node_index(spec->pin, tag);
index = hda_node_index(spec->pin, pin_nid);
if (index < 0)
return;

if (spec->old_pin_detect) {
if (pind)
hdmi_present_sense(codec, tag, &spec->sink_eld[index]);
pind = spec->sink_eld[index].monitor_present;
}

spec->sink_eld[index].monitor_present = pind;
spec->sink_eld[index].eld_valid = eldv;

if (pind && eldv) {
hdmi_get_show_eld(codec, spec->pin[index],
&spec->sink_eld[index]);
/* TODO: do real things about ELD */
}

snd_hda_input_jack_report(codec, tag);
hdmi_present_sense(codec, pin_nid, &spec->sink_eld[index]);
}

static void hdmi_non_intrinsic_event(struct hda_codec *codec, unsigned int res)
Expand Down Expand Up @@ -903,13 +877,33 @@ static int hdmi_read_pin_conn(struct hda_codec *codec, hda_nid_t pin_nid)
static void hdmi_present_sense(struct hda_codec *codec, hda_nid_t pin_nid,
struct hdmi_eld *eld)
{
/*
* Always execute a GetPinSense verb here, even when called from
* hdmi_intrinsic_event; for some NVIDIA HW, the unsolicited
* response's PD bit is not the real PD value, but indicates that
* the real PD value changed. An older version of the HD-audio
* specification worked this way. Hence, we just ignore the data in
* the unsolicited response to avoid custom WARs.
*/
int present = snd_hda_pin_sense(codec, pin_nid);

memset(eld, 0, sizeof(*eld));

eld->monitor_present = !!(present & AC_PINSENSE_PRESENCE);
eld->eld_valid = !!(present & AC_PINSENSE_ELDV);
if (eld->monitor_present)
eld->eld_valid = !!(present & AC_PINSENSE_ELDV);
else
eld->eld_valid = 0;

if (present & AC_PINSENSE_ELDV)
hdmi_get_show_eld(codec, pin_nid, eld);
printk(KERN_INFO
"HDMI status: Pin=%d Presence_Detect=%d ELD_Valid=%d\n",
pin_nid, eld->monitor_present, eld->eld_valid);

if (eld->eld_valid)
if (!snd_hdmi_get_eld(eld, codec, pin_nid))
snd_hdmi_show_eld(eld);

snd_hda_input_jack_report(codec, pin_nid);
}

static int hdmi_add_pin(struct hda_codec *codec, hda_nid_t pin_nid)
Expand All @@ -927,7 +921,6 @@ static int hdmi_add_pin(struct hda_codec *codec, hda_nid_t pin_nid)
SND_JACK_VIDEOOUT, NULL);
if (err < 0)
return err;
snd_hda_input_jack_report(codec, pin_nid);

hdmi_present_sense(codec, pin_nid, &spec->sink_eld[spec->num_pins]);

Expand Down Expand Up @@ -1490,18 +1483,6 @@ static const struct hda_codec_ops nvhdmi_patch_ops_2ch = {
.free = generic_hdmi_free,
};

static int patch_nvhdmi_8ch_89(struct hda_codec *codec)
{
struct hdmi_spec *spec;
int err = patch_generic_hdmi(codec);

if (err < 0)
return err;
spec = codec->spec;
spec->old_pin_detect = 1;
return 0;
}

static int patch_nvhdmi_2ch(struct hda_codec *codec)
{
struct hdmi_spec *spec;
Expand All @@ -1515,7 +1496,6 @@ static int patch_nvhdmi_2ch(struct hda_codec *codec)
spec->multiout.num_dacs = 0; /* no analog */
spec->multiout.max_channels = 2;
spec->multiout.dig_out_nid = nvhdmi_master_con_nid_7x;
spec->old_pin_detect = 1;
spec->num_cvts = 1;
spec->cvt[0] = nvhdmi_master_con_nid_7x;
spec->pcm_playback = &nvhdmi_pcm_playback_2ch;
Expand Down Expand Up @@ -1658,28 +1638,28 @@ static const struct hda_codec_preset snd_hda_preset_hdmi[] = {
{ .id = 0x10de0005, .name = "MCP77/78 HDMI", .patch = patch_nvhdmi_8ch_7x },
{ .id = 0x10de0006, .name = "MCP77/78 HDMI", .patch = patch_nvhdmi_8ch_7x },
{ .id = 0x10de0007, .name = "MCP79/7A HDMI", .patch = patch_nvhdmi_8ch_7x },
{ .id = 0x10de000a, .name = "GPU 0a HDMI/DP", .patch = patch_nvhdmi_8ch_89 },
{ .id = 0x10de000b, .name = "GPU 0b HDMI/DP", .patch = patch_nvhdmi_8ch_89 },
{ .id = 0x10de000c, .name = "MCP89 HDMI", .patch = patch_nvhdmi_8ch_89 },
{ .id = 0x10de000d, .name = "GPU 0d HDMI/DP", .patch = patch_nvhdmi_8ch_89 },
{ .id = 0x10de0010, .name = "GPU 10 HDMI/DP", .patch = patch_nvhdmi_8ch_89 },
{ .id = 0x10de0011, .name = "GPU 11 HDMI/DP", .patch = patch_nvhdmi_8ch_89 },
{ .id = 0x10de0012, .name = "GPU 12 HDMI/DP", .patch = patch_nvhdmi_8ch_89 },
{ .id = 0x10de0013, .name = "GPU 13 HDMI/DP", .patch = patch_nvhdmi_8ch_89 },
{ .id = 0x10de0014, .name = "GPU 14 HDMI/DP", .patch = patch_nvhdmi_8ch_89 },
{ .id = 0x10de0015, .name = "GPU 15 HDMI/DP", .patch = patch_nvhdmi_8ch_89 },
{ .id = 0x10de0016, .name = "GPU 16 HDMI/DP", .patch = patch_nvhdmi_8ch_89 },
{ .id = 0x10de000a, .name = "GPU 0a HDMI/DP", .patch = patch_generic_hdmi },
{ .id = 0x10de000b, .name = "GPU 0b HDMI/DP", .patch = patch_generic_hdmi },
{ .id = 0x10de000c, .name = "MCP89 HDMI", .patch = patch_generic_hdmi },
{ .id = 0x10de000d, .name = "GPU 0d HDMI/DP", .patch = patch_generic_hdmi },
{ .id = 0x10de0010, .name = "GPU 10 HDMI/DP", .patch = patch_generic_hdmi },
{ .id = 0x10de0011, .name = "GPU 11 HDMI/DP", .patch = patch_generic_hdmi },
{ .id = 0x10de0012, .name = "GPU 12 HDMI/DP", .patch = patch_generic_hdmi },
{ .id = 0x10de0013, .name = "GPU 13 HDMI/DP", .patch = patch_generic_hdmi },
{ .id = 0x10de0014, .name = "GPU 14 HDMI/DP", .patch = patch_generic_hdmi },
{ .id = 0x10de0015, .name = "GPU 15 HDMI/DP", .patch = patch_generic_hdmi },
{ .id = 0x10de0016, .name = "GPU 16 HDMI/DP", .patch = patch_generic_hdmi },
/* 17 is known to be absent */
{ .id = 0x10de0018, .name = "GPU 18 HDMI/DP", .patch = patch_nvhdmi_8ch_89 },
{ .id = 0x10de0019, .name = "GPU 19 HDMI/DP", .patch = patch_nvhdmi_8ch_89 },
{ .id = 0x10de001a, .name = "GPU 1a HDMI/DP", .patch = patch_nvhdmi_8ch_89 },
{ .id = 0x10de001b, .name = "GPU 1b HDMI/DP", .patch = patch_nvhdmi_8ch_89 },
{ .id = 0x10de001c, .name = "GPU 1c HDMI/DP", .patch = patch_nvhdmi_8ch_89 },
{ .id = 0x10de0040, .name = "GPU 40 HDMI/DP", .patch = patch_nvhdmi_8ch_89 },
{ .id = 0x10de0041, .name = "GPU 41 HDMI/DP", .patch = patch_nvhdmi_8ch_89 },
{ .id = 0x10de0042, .name = "GPU 42 HDMI/DP", .patch = patch_nvhdmi_8ch_89 },
{ .id = 0x10de0043, .name = "GPU 43 HDMI/DP", .patch = patch_nvhdmi_8ch_89 },
{ .id = 0x10de0044, .name = "GPU 44 HDMI/DP", .patch = patch_nvhdmi_8ch_89 },
{ .id = 0x10de0018, .name = "GPU 18 HDMI/DP", .patch = patch_generic_hdmi },
{ .id = 0x10de0019, .name = "GPU 19 HDMI/DP", .patch = patch_generic_hdmi },
{ .id = 0x10de001a, .name = "GPU 1a HDMI/DP", .patch = patch_generic_hdmi },
{ .id = 0x10de001b, .name = "GPU 1b HDMI/DP", .patch = patch_generic_hdmi },
{ .id = 0x10de001c, .name = "GPU 1c HDMI/DP", .patch = patch_generic_hdmi },
{ .id = 0x10de0040, .name = "GPU 40 HDMI/DP", .patch = patch_generic_hdmi },
{ .id = 0x10de0041, .name = "GPU 41 HDMI/DP", .patch = patch_generic_hdmi },
{ .id = 0x10de0042, .name = "GPU 42 HDMI/DP", .patch = patch_generic_hdmi },
{ .id = 0x10de0043, .name = "GPU 43 HDMI/DP", .patch = patch_generic_hdmi },
{ .id = 0x10de0044, .name = "GPU 44 HDMI/DP", .patch = patch_generic_hdmi },
{ .id = 0x10de0067, .name = "MCP67 HDMI", .patch = patch_nvhdmi_2ch },
{ .id = 0x10de8001, .name = "MCP73 HDMI", .patch = patch_nvhdmi_2ch },
{ .id = 0x80860054, .name = "IbexPeak HDMI", .patch = patch_generic_hdmi },
Expand Down

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