[PATCH] ALSA: hda/proc - print DP-MST connections

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

 



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@xxxxxxxxxxxxxxx>
---
 sound/pci/hda/hda_proc.c | 39 ++++++++++++++++++++++++++++++++++++++-
 1 file changed, 38 insertions(+), 1 deletion(-)

diff --git a/sound/pci/hda/hda_proc.c b/sound/pci/hda/hda_proc.c
index 0631f31ef87f..e1cba574cadb 100644
--- a/sound/pci/hda/hda_proc.c
+++ b/sound/pci/hda/hda_proc.c
@@ -679,6 +679,39 @@ 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);
+
+	dev_id_saved = snd_hda_get_dev_select(codec, nid);
+	snd_hda_set_dev_select(codec, nid, dev_num);
+	if (snd_hda_get_raw_connections(codec, nid, conn, conn_len) < 0)
+		goto out;
+
+	curr = snd_hda_codec_read(codec, nid, 0,
+				  AC_VERB_GET_CONNECT_SEL, 0);
+
+	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 +735,14 @@ 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");
 	}
 }
 
-- 
2.28.0




[Index of Archives]     [ALSA User]     [Linux Audio Users]     [Pulse Audio]     [Kernel Archive]     [Asterisk PBX]     [Photo Sharing]     [Linux Sound]     [Video 4 Linux]     [Gimp]     [Yosemite News]

  Powered by Linux