[PATCH BlueZ v2 01/15] doc/qualification: gap-pics: add footnote for TSPC_GAP_21_9 feature

[Christian Eggers <ceggers@arri.de>]

This feature is not supported by some host controllers (e.g. RTL8761BU)
and must be disabled with such hardware.
---
 doc/qualification/gap-pics.rst | 14 +++++++++++++-
 1 file changed, 13 insertions(+), 1 deletion(-)

diff --git a/doc/qualification/gap-pics.rst b/doc/qualification/gap-pics.rst
index f5b63a00ac98..c9d7b003d547 100644
--- a/doc/qualification/gap-pics.rst
+++ b/doc/qualification/gap-pics.rst
@@ -832,7 +832,7 @@ Prerequisite: GAP 5/3 "Peripheral (LE)" OR GAP 38/3 "Peripheral (BR/EDR/LE)"
 | TSPC_GAP_21_8    | x        | Peripheral-initiated Feature Exchange        |
 |                  |          | procedure (C.1)                              |
 +------------------+----------+----------------------------------------------+
-| TSPC_GAP_21_9    | x        | Connection Parameter Request procedure (O)   |
+| TSPC_GAP_21_9    | x(1)     | Connection Parameter Request procedure (O)   |
 +------------------+----------+----------------------------------------------+
 | TSPC_GAP_21_10   |          | Data Length Update procedure (O)             |
 +------------------+----------+----------------------------------------------+
@@ -848,6 +848,18 @@ Prerequisite: GAP 5/3 "Peripheral (LE)" OR GAP 38/3 "Peripheral (BR/EDR/LE)"
   otherwise Optional.
 - C.2: Excluded IF SUM ICS 31/17 "Core v4.2" OR SUM ICS 31/18 "Core v4.2+HS",
   otherwise Optional.
+- (1) Only set if Bluetooth controller supports the "Connection Parameters
+  Request procedure" LE feature, otherwise, GAP/CONN/CPUP/BV-08-C will fail.
+  To check for this feature, run in bluetoothctl:
+  - power off
+  - hci.open 0 user
+  - hci.cmd 0x2003
+    HCI Command complete:
+    00 bd 5f 66 00 00 00 00 00                       .._f.....       
+       ^^ 
+       ++- This byte must have the 2nd bit (0x02) set.
+  - hci.close
+  - power on
 
 LE Capability Statement
 =======================
-- 
2.51.0