ALSA: hda/proc - print DP-MST connections

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>

diff --git a/sound/pci/hda/hda_proc.c b/sound/pci/hda/hda_proc.c
index 0631f31..00c2eeb 100644 (file)
--- a/sound/pci/hda/hda_proc.c
+++ b/sound/pci/hda/hda_proc.c
@@ -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");
        }
 }