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Bluetooth: ISO: Support SCM_TIMESTAMPING for ISO TS

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User-space applications (e.g. PipeWire) depend on
ISO-formatted timestamps for precise audio sync.

The ISO ts is based on the controller’s clock domain,
so hardware timestamping (hwtimestamp) must be used.

Ref: Documentation/networking/timestamping.rst,
section 3.1 Hardware Timestamping.

Signed-off-by: Yang Li <yang.li@amlogic.com>
Signed-off-by: Luiz Augusto von Dentz <luiz.von.dentz@intel.com>
This commit is contained in:
Yang Li 2025-07-07 10:38:17 +08:00 • committed by Luiz Augusto von Dentz
parent 7565bc5659
commit ef568ae04e
1 changed files with 12 additions and 1 deletions
Download patch file Download diff file Expand all files Collapse all files

13
net/bluetooth/iso.c
View file

@ -2289,6 +2289,7 @@ static void iso_disconn_cfm(struct hci_conn *hcon, __u8 reason)
void iso_recv(struct hci_conn *hcon, struct sk_buff *skb, u16 flags)
{
struct iso_conn *conn = hcon->iso_data;
struct skb_shared_hwtstamps *hwts;
__u16 pb, ts, len, sn;
if (!conn)
@ -2312,13 +2313,16 @@ void iso_recv(struct hci_conn *hcon, struct sk_buff *skb, u16 flags)
if (ts) {
struct hci_iso_ts_data_hdr *hdr;
/* TODO: add timestamp to the packet? */
hdr = skb_pull_data(skb, HCI_ISO_TS_DATA_HDR_SIZE);
if (!hdr) {
BT_ERR("Frame is too short (len %d)", skb->len);
goto drop;
}
/* Record the timestamp to skb */
hwts = skb_hwtstamps(skb);
hwts->hwtstamp = us_to_ktime(le32_to_cpu(hdr->ts));
sn = __le16_to_cpu(hdr->sn);
len = __le16_to_cpu(hdr->slen);
} else {
@ -2370,6 +2374,13 @@ void iso_recv(struct hci_conn *hcon, struct sk_buff *skb, u16 flags)
skb_copy_from_linear_data(skb, skb_put(conn->rx_skb, skb->len),
skb->len);
conn->rx_len = len - skb->len;
/* Copy hw timestamp from skb to rx_skb if present */
if (ts) {
hwts = skb_hwtstamps(conn->rx_skb);
hwts->hwtstamp = skb_hwtstamps(skb)->hwtstamp;
}
break;
case ISO_CONT: