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Bluetooth: Controller: ISO-AL validation and selection of TX time stamps

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Intent is to pass Ellisys ISOAL quality tests for framed TX scenarios
where the TX SDU includes a time stamp that is not based on the
controller's clock.

Changes:
-- Include controller's reception time as a separate field in the TX SDU
   information
-- Include decision on whether SDU time stamp is valid and based on the
   controller's clock
-- Arbitrate and select / compute time stamp for the SDU

Signed-off-by: Nirosharn Amarasinghe <niag@demant.com>
This commit is contained in:
Nirosharn Amarasinghe 2023-07-18 16:32:29 +02:00 • committed by Carles Cufí
commit d414cab87a
4 changed files with 178 additions and 57 deletions
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14
subsys/bluetooth/controller/hci/hci.c
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@ -5700,17 +5700,21 @@ int hci_iso_handle(struct net_buf *buf, struct net_buf **evt)
* -- A captured time stamp of the SDU
* -- A time stamp provided by the higher layer
* -- A computed time stamp based on a sequence counter provided by the
* higher layer (Not implemented)
* -- Any other method of determining Time_Offset (Not implemented)
* higher layer
* -- Any other method of determining Time_Offset
* (Uses a timestamp computed from the difference in provided
* timestamps, if the timestamp is deemed not based on the
* controller's clock)
*/
sdu_frag_tx.cntr_time_stamp = HAL_TICKER_TICKS_TO_US(ticker_ticks_now_get());
if (ts_flag) {
/* Overwrite time stamp with HCI provided time stamp */
/* Use HCI provided time stamp */
time_stamp = net_buf_pull_mem(buf, sizeof(*time_stamp));
len -= sizeof(*time_stamp);
sdu_frag_tx.time_stamp = sys_le32_to_cpu(*time_stamp);
} else {
sdu_frag_tx.time_stamp =
HAL_TICKER_TICKS_TO_US(ticker_ticks_now_get());
/* Use controller's capture time */
sdu_frag_tx.time_stamp = sdu_frag_tx.cntr_time_stamp;
}
/* Extract ISO data header if included (PB_Flag 0b00 or 0b10) */