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authorWu Fengguang <fengguang.wu@intel.com>2010-09-21 14:25:49 +0800
committerTakashi Iwai <tiwai@suse.de>2010-09-21 09:49:57 +0200
commit53d7d69d8ffdfa60c5b66cc2e9ee0774aaaef5c0 (patch)
treecfb3d48fe7e4a11cdae0a3adae67cdcc38461e59 /sound
parent0ec33d1f952934ea3251cefc6d108b47818eedd0 (diff)
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ALSA: hdmi - support infoframe for DisplayPort
DisplayPort works mostly in the same way as HDMI, except that it expects a slightly different audio infoframe format. Citations from "HDA036-A: Display Port Support and HDMI Miscellaneous Corrections": The HDMI specification defines a data island packet with a header of 4 bytes (3 bytes content + 1 byte ECC) and packet body of 32 bytes (28 bytes content and 4 bytes ECC). Display Port specification on the other hand defines a data island packet (secondary data packet) with header of 4 bytes protected by 4 bytes of parity, and data of theoretically up to 1024 bytes with each 16 bytes chunk of data protected by 4 bytes of parity. Note that the ECC or parity bytes are not present in the DIP content populated by software and are hardware generated. It tests DP connection based on the ELD conn_type field, which will be set by the graphics driver and can be overriden manually by users through the /proc/asound/card0/eld* interface. The DP infoframe is tested OK on Intel SandyBridge/CougarPoint platform. Signed-off-by: Wu Fengguang <fengguang.wu@intel.com> Signed-off-by: Takashi Iwai <tiwai@suse.de>
Diffstat (limited to 'sound')
-rw-r--r--sound/pci/hda/patch_hdmi.c110
1 files changed, 73 insertions, 37 deletions
diff --git a/sound/pci/hda/patch_hdmi.c b/sound/pci/hda/patch_hdmi.c
index cb997ca0fdf..1f4ae1aeca4 100644
--- a/sound/pci/hda/patch_hdmi.c
+++ b/sound/pci/hda/patch_hdmi.c
@@ -84,13 +84,25 @@ struct hdmi_audio_infoframe {
u8 ver; /* 0x01 */
u8 len; /* 0x0a */
- u8 checksum; /* PB0 */
+ u8 checksum;
+
u8 CC02_CT47; /* CC in bits 0:2, CT in 4:7 */
u8 SS01_SF24;
u8 CXT04;
u8 CA;
u8 LFEPBL01_LSV36_DM_INH7;
- u8 reserved[5]; /* PB6 - PB10 */
+};
+
+struct dp_audio_infoframe {
+ u8 type; /* 0x84 */
+ u8 len; /* 0x1b */
+ u8 ver; /* 0x11 << 2 */
+
+ u8 CC02_CT47; /* match with HDMI infoframe from this on */
+ u8 SS01_SF24;
+ u8 CXT04;
+ u8 CA;
+ u8 LFEPBL01_LSV36_DM_INH7;
};
/*
@@ -194,7 +206,7 @@ static int hdmi_channel_mapping[0x32][8] = {
* This is an ordered list!
*
* The preceding ones have better chances to be selected by
- * hdmi_setup_channel_allocation().
+ * hdmi_channel_allocation().
*/
static struct cea_channel_speaker_allocation channel_allocations[] = {
/* channel: 7 6 5 4 3 2 1 0 */
@@ -371,14 +383,14 @@ static void init_channel_allocations(void)
*
* TODO: it could select the wrong CA from multiple candidates.
*/
-static int hdmi_setup_channel_allocation(struct hda_codec *codec, hda_nid_t nid,
- struct hdmi_audio_infoframe *ai)
+static int hdmi_channel_allocation(struct hda_codec *codec, hda_nid_t nid,
+ int channels)
{
struct hdmi_spec *spec = codec->spec;
struct hdmi_eld *eld;
int i;
+ int ca = 0;
int spk_mask = 0;
- int channels = 1 + (ai->CC02_CT47 & 0x7);
char buf[SND_PRINT_CHANNEL_ALLOCATION_ADVISED_BUFSIZE];
/*
@@ -416,16 +428,16 @@ static int hdmi_setup_channel_allocation(struct hda_codec *codec, hda_nid_t nid,
if (channels == channel_allocations[i].channels &&
(spk_mask & channel_allocations[i].spk_mask) ==
channel_allocations[i].spk_mask) {
- ai->CA = channel_allocations[i].ca_index;
+ ca = channel_allocations[i].ca_index;
break;
}
}
snd_print_channel_allocation(eld->spk_alloc, buf, sizeof(buf));
snd_printdd("HDMI: select CA 0x%x for %d-channel allocation: %s\n",
- ai->CA, channels, buf);
+ ca, channels, buf);
- return ai->CA;
+ return ca;
}
static void hdmi_debug_channel_mapping(struct hda_codec *codec,
@@ -447,10 +459,9 @@ static void hdmi_debug_channel_mapping(struct hda_codec *codec,
static void hdmi_setup_channel_mapping(struct hda_codec *codec,
hda_nid_t pin_nid,
- struct hdmi_audio_infoframe *ai)
+ int ca)
{
int i;
- int ca = ai->CA;
int err;
if (hdmi_channel_mapping[ca][1] == 0) {
@@ -547,41 +558,37 @@ static void hdmi_clear_dip_buffers(struct hda_codec *codec, hda_nid_t pin_nid)
#endif
}
-static void hdmi_checksum_audio_infoframe(struct hdmi_audio_infoframe *ai)
+static void hdmi_checksum_audio_infoframe(struct hdmi_audio_infoframe *hdmi_ai)
{
- u8 *bytes = (u8 *)ai;
+ u8 *bytes = (u8 *)hdmi_ai;
u8 sum = 0;
int i;
- ai->checksum = 0;
+ hdmi_ai->checksum = 0;
- for (i = 0; i < sizeof(*ai); i++)
+ for (i = 0; i < sizeof(*hdmi_ai); i++)
sum += bytes[i];
- ai->checksum = -sum;
+ hdmi_ai->checksum = -sum;
}
static void hdmi_fill_audio_infoframe(struct hda_codec *codec,
hda_nid_t pin_nid,
- struct hdmi_audio_infoframe *ai)
+ u8 *dip, int size)
{
- u8 *bytes = (u8 *)ai;
int i;
hdmi_debug_dip_size(codec, pin_nid);
hdmi_clear_dip_buffers(codec, pin_nid); /* be paranoid */
- hdmi_checksum_audio_infoframe(ai);
-
hdmi_set_dip_index(codec, pin_nid, 0x0, 0x0);
- for (i = 0; i < sizeof(*ai); i++)
- hdmi_write_dip_byte(codec, pin_nid, bytes[i]);
+ for (i = 0; i < size; i++)
+ hdmi_write_dip_byte(codec, pin_nid, dip[i]);
}
static bool hdmi_infoframe_uptodate(struct hda_codec *codec, hda_nid_t pin_nid,
- struct hdmi_audio_infoframe *ai)
+ u8 *dip, int size)
{
- u8 *bytes = (u8 *)ai;
u8 val;
int i;
@@ -590,10 +597,10 @@ static bool hdmi_infoframe_uptodate(struct hda_codec *codec, hda_nid_t pin_nid,
return false;
hdmi_set_dip_index(codec, pin_nid, 0x0, 0x0);
- for (i = 0; i < sizeof(*ai); i++) {
+ for (i = 0; i < size; i++) {
val = snd_hda_codec_read(codec, pin_nid, 0,
AC_VERB_GET_HDMI_DIP_DATA, 0);
- if (val != bytes[i])
+ if (val != dip[i])
return false;
}
@@ -605,15 +612,13 @@ static void hdmi_setup_audio_infoframe(struct hda_codec *codec, hda_nid_t nid,
{
struct hdmi_spec *spec = codec->spec;
hda_nid_t pin_nid;
+ int channels = substream->runtime->channels;
+ int ca;
int i;
- struct hdmi_audio_infoframe ai = {
- .type = 0x84,
- .ver = 0x01,
- .len = 0x0a,
- .CC02_CT47 = substream->runtime->channels - 1,
- };
+ u8 ai[max(sizeof(struct hdmi_audio_infoframe),
+ sizeof(struct dp_audio_infoframe))];
- hdmi_setup_channel_allocation(codec, nid, &ai);
+ ca = hdmi_channel_allocation(codec, nid, channels);
for (i = 0; i < spec->num_pins; i++) {
if (spec->pin_cvt[i] != nid)
@@ -622,14 +627,45 @@ static void hdmi_setup_audio_infoframe(struct hda_codec *codec, hda_nid_t nid,
continue;
pin_nid = spec->pin[i];
- if (!hdmi_infoframe_uptodate(codec, pin_nid, &ai)) {
+
+ memset(ai, 0, sizeof(ai));
+ if (spec->sink_eld[i].conn_type == 0) { /* HDMI */
+ struct hdmi_audio_infoframe *hdmi_ai;
+
+ hdmi_ai = (struct hdmi_audio_infoframe *)ai;
+ hdmi_ai->type = 0x84;
+ hdmi_ai->ver = 0x01;
+ hdmi_ai->len = 0x0a;
+ hdmi_ai->CC02_CT47 = channels - 1;
+ hdmi_checksum_audio_infoframe(hdmi_ai);
+ } else if (spec->sink_eld[i].conn_type == 1) { /* DisplayPort */
+ struct dp_audio_infoframe *dp_ai;
+
+ dp_ai = (struct dp_audio_infoframe *)ai;
+ dp_ai->type = 0x84;
+ dp_ai->len = 0x1b;
+ dp_ai->ver = 0x11 << 2;
+ dp_ai->CC02_CT47 = channels - 1;
+ } else {
+ snd_printd("HDMI: unknown connection type at pin %d\n",
+ pin_nid);
+ continue;
+ }
+
+ /*
+ * sizeof(ai) is used instead of sizeof(*hdmi_ai) or
+ * sizeof(*dp_ai) to avoid partial match/update problems when
+ * the user switches between HDMI/DP monitors.
+ */
+ if (!hdmi_infoframe_uptodate(codec, pin_nid, ai, sizeof(ai))) {
snd_printdd("hdmi_setup_audio_infoframe: "
"cvt=%d pin=%d channels=%d\n",
nid, pin_nid,
- substream->runtime->channels);
- hdmi_setup_channel_mapping(codec, pin_nid, &ai);
+ channels);
+ hdmi_setup_channel_mapping(codec, pin_nid, ca);
hdmi_stop_infoframe_trans(codec, pin_nid);
- hdmi_fill_audio_infoframe(codec, pin_nid, &ai);
+ hdmi_fill_audio_infoframe(codec, pin_nid,
+ ai, sizeof(ai));
hdmi_start_infoframe_trans(codec, pin_nid);
}
}