On 11/14/19 4:27 PM, Takashi Iwai wrote:
On Thu, 14 Nov 2019 04:37:02 +0100, Nikhil Mahale wrote:
Document change notification HDA040-A for the Intel High Definition Audio 1.0a specification introduces a Device Select verb for Digital Display Pin Widgets that are multi-stream capable. This verb selects a Device Entry that is used by subsequent Pin Widget verbs, including the Get Connection List Entry verb.
This patch queries the current Device Select value, associates it with the connection list, and updates the connection list management code to consider dev_id along with nid.
I don't get why this is needed. This is the list that is added only from snd_hda_override_conn_list(), and you don't change that call pattern, so dev_id is always zero.
In follow-on patch "ALSA: hda - Add DP-MST support for non-acomp codecs", hdmi_read_pin_conn() calls into snd_hda_set_dev_select() before running into code path -
snd_hda_get_connections() |-> snd_hda_get_conn_list() |-> read_and_add_raw_conns() |-> snd_hda_override_conn_list() |-> add_conn_list()
If I understand spec correctly, conn_list need to read/write/track along with device entry set into AC_VERB_SET_DEVICE_SEL verb, right? This patch address that limited part here.
Thanks, Nikhil Mahale
thanks,
Takashi
Signed-off-by: Nikhil Mahale nmahale@nvidia.com Reviewed-by: Aaron Plattner aplattner@nvidia.com
sound/pci/hda/hda_codec.c | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-)
diff --git a/sound/pci/hda/hda_codec.c b/sound/pci/hda/hda_codec.c index a2fb19129219..8f32cab8f4a4 100644 --- a/sound/pci/hda/hda_codec.c +++ b/sound/pci/hda/hda_codec.c @@ -88,6 +88,7 @@ struct hda_conn_list { struct list_head list; int len; hda_nid_t nid;
- int dev_id; hda_nid_t conns[0];
};
@@ -96,8 +97,9 @@ static struct hda_conn_list * lookup_conn_list(struct hda_codec *codec, hda_nid_t nid) { struct hda_conn_list *p;
- int dev_id = snd_hda_get_dev_select(codec, nid); list_for_each_entry(p, &codec->conn_list, list) {
if (p->nid == nid)
if (p->nid == nid && p->dev_id == dev_id) return p;@@ -113,6 +115,7 @@ static int add_conn_list(struct hda_codec *codec, hda_nid_t nid, int len, return -ENOMEM; p->len = len; p->nid = nid;
- p->dev_id = snd_hda_get_dev_select(codec, nid); memcpy(p->conns, list, len * sizeof(hda_nid_t)); list_add(&p->list, &codec->conn_list); return 0;
-- 2.16.4
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