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| author | Kai Vehmanen <kai.vehmanen@linux.intel.com> | 2020-12-08 21:57:36 +0300 |
|---|---|---|
| committer | Takashi Iwai <tiwai@suse.de> | 2020-12-08 22:04:33 +0300 |
| commit | 19bb4f78c91fa46bdf978e18766118498c3d2e63 (patch) | |
| tree | c691c44a1cbd5ad87157229c855458bf1c9dbfac /sound | |
| parent | 88a06d6fd6b369d88cec46c62db3e2604a2f50d5 (diff) | |
| download | linux-19bb4f78c91fa46bdf978e18766118498c3d2e63.tar.xz | |
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>
Diffstat (limited to 'sound')
| -rw-r--r-- | sound/pci/hda/hda_proc.c | 38 |
1 files changed, 37 insertions, 1 deletions
diff --git a/sound/pci/hda/hda_proc.c b/sound/pci/hda/hda_proc.c index 0631f31ef87f..00c2eeb2c472 100644 --- 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"); } } |