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ALSA: hda/proc - print DP-MST connections

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To help in debugging issues with DisplayPort Multi-Stream Transport (aka
DP-MST) support, print information of active connections for each device
of a display audio pin widget.

Example output with the patch with two monitors connected to a DP-MST hub:

Devices: 4
     Dev 00: PD = 0, ELDV = 0, IA = 0, Connections [ 0x03* 0x05 0x07 0x09 ]
     Dev 01: PD = 1, ELDV = 1, IA = 0, Connections [ 0x03* 0x05 0x07 0x09 ]
    *Dev 02: PD = 1, ELDV = 1, IA = 0, Connections [ 0x03 0x05* 0x07 0x09 ]
     Dev 03: PD = 0, ELDV = 0, IA = 0, Connections [ 0x03* 0x05 0x07 0x09 ]
Connection: 4
     0x03 0x05* 0x07 0x09

Format of existing "Connection:" entry is left intact to keep
compatibility.

Signed-off-by: Kai Vehmanen <kai.vehmanen@linux.intel.com>
Link: https://lore.kernel.org/r/20201208185736.2877541-1-kai.vehmanen@linux.intel.com
Signed-off-by: Takashi Iwai <tiwai@suse.de>
This commit is contained in:
Kai Vehmanen 2020-12-08 20:57:36 +02:00 committed by Takashi Iwai
parent 88a06d6fd6
commit 19bb4f78c9
1 changed files with 37 additions and 1 deletions
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38
sound/pci/hda/hda_proc.c
View File

@ -679,6 +679,38 @@ static void print_gpio(struct snd_info_buffer *buffer,
print_nid_array(buffer, codec, nid, &codec->nids);
}
static void print_dpmst_connections(struct snd_info_buffer *buffer, struct hda_codec *codec,
hda_nid_t nid, int dev_num)
{
int c, conn_len, curr, dev_id_saved;
hda_nid_t *conn;
conn_len = snd_hda_get_num_raw_conns(codec, nid);
if (conn_len <= 0)
return;
conn = kmalloc_array(conn_len, sizeof(hda_nid_t), GFP_KERNEL);
if (!conn)
return;
dev_id_saved = snd_hda_get_dev_select(codec, nid);
snd_hda_set_dev_select(codec, nid, dev_num);
curr = snd_hda_codec_read(codec, nid, 0, AC_VERB_GET_CONNECT_SEL, 0);
if (snd_hda_get_raw_connections(codec, nid, conn, conn_len) < 0)
goto out;
for (c = 0; c < conn_len; c++) {
snd_iprintf(buffer, " 0x%02x", conn[c]);
if (c == curr)
snd_iprintf(buffer, "*");
}
out:
kfree(conn);
snd_hda_set_dev_select(codec, nid, dev_id_saved);
}
static void print_device_list(struct snd_info_buffer *buffer,
struct hda_codec *codec, hda_nid_t nid)
{
@ -702,10 +734,14 @@ static void print_device_list(struct snd_info_buffer *buffer,
snd_iprintf(buffer, " ");
snd_iprintf(buffer,
"Dev %02d: PD = %d, ELDV = %d, IA = %d\n", i,
"Dev %02d: PD = %d, ELDV = %d, IA = %d, Connections [", i,
!!(dev_list[i] & AC_DE_PD),
!!(dev_list[i] & AC_DE_ELDV),
!!(dev_list[i] & AC_DE_IA));
print_dpmst_connections(buffer, codec, nid, i);
snd_iprintf(buffer, " ]\n");
}
}