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Bluetooth: Controller: Fix BT_CTLR_FAST_ENC Kconfig help text

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Fix BT_CTLR_FAST_ENC Kconfig help text to reflect the
current Encryption Setup Procedure behavior.

With the split architecture, Encryption Setup Procedure
will take 4 connection events when BT_CTLR_FAST_ENC is
enabled, in comparison to 3 connection events in the
legacy Controller architecture. This is due to split
architecture processes control procedures in the lower
priority Upper Linker Layer execution context.

Signed-off-by: Vinayak Kariappa Chettimada <vich@nordicsemi.no>
This commit is contained in:
Vinayak Kariappa Chettimada 2021-09-28 13:36:04 +05:30 • committed by Carles Cufí
commit 1ea0fabe72
1 changed files with 5 additions and 8 deletions
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13
subsys/bluetooth/controller/Kconfig.ll_sw_split
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@ -427,15 +427,12 @@ config BT_CTLR_FAST_ENC
depends on BT_CTLR_LE_ENC depends on BT_CTLR_LE_ENC
default y if BT_HCI_RAW default y if BT_HCI_RAW
help help
Enable connection encryption setup in 3 connection intervals. Enable connection encryption setup in 4 connection events.
Peripheral will respond to Encryption Request with Encryption Response Peripheral will respond to Encryption Request with Encryption Response
in the same connection interval, and also, will respond with Start in the next connection event, and will transmit Start Encryption
Encryption Response PDU in the 3rd connection interval, hence Request PDU in the same connection event, hence completing encryption
completing encryption setup in 3 connection intervals. Encrypted data setup in 4 connection events. Encrypted data would be transmitted as
would be transmitted as fast as in 3rd connection interval from the fast as in 4th connection event from Encryption Request.
connection establishment.
Maximum CPU time in Radio ISR will increase if this feature is
selected.
config BT_CTLR_LLCP_CONN config BT_CTLR_LLCP_CONN
int "Number of connections with worst-case overlapping procedures" int "Number of connections with worst-case overlapping procedures"