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From:   Raul Cheleguini <raul.cheleguini@gmail.com>
To:     linux-bluetooth@vger.kernel.org
Cc:     marcel@holtmann.org, johan.hedberg@gmail.com, luiz.dentz@gmail.com,
        Raul Cheleguini <raul.cheleguini@gmail.com>,
        imoc <wzj9912@gmail.com>
Subject: [PATCH] Bluetooth: Add new quirk for broken set random RPA timeout for ATS2851
Date:   Thu, 23 Mar 2023 10:45:39 -0300
Message-Id: <20230323134539.3957410-1-raul.cheleguini@gmail.com>
MIME-Version: 1.0
Content-Transfer-Encoding: 8bit
Precedence: bulk

The ATS2851 based controller advertises support for command "LE Set Random
Private Address Timeout" but does not actually implement it, impeding the
controller initialization.

Add the quirk HCI_QUIRK_BROKEN_SET_RPA_TIMEOUT to unblock the controller
initialization.

< HCI Command: LE Set Resolvable Private... (0x08|0x002e) plen 2
        Timeout: 900 seconds
> HCI Event: Command Status (0x0f) plen 4
      LE Set Resolvable Private Address Timeout (0x08|0x002e) ncmd 1
        Status: Unknown HCI Command (0x01)

Co-developed-by: imoc <wzj9912@gmail.com>
Signed-off-by: imoc <wzj9912@gmail.com>
Signed-off-by: Raul Cheleguini <raul.cheleguini@gmail.com>
---
 drivers/bluetooth/btusb.c   | 1 +
 include/net/bluetooth/hci.h | 8 ++++++++
 net/bluetooth/hci_sync.c    | 6 +++++-
 3 files changed, 14 insertions(+), 1 deletion(-)

diff --git a/drivers/bluetooth/btusb.c b/drivers/bluetooth/btusb.c
index 7382b021f3df..3a3a966419af 100644
--- a/drivers/bluetooth/btusb.c
+++ b/drivers/bluetooth/btusb.c
@@ -4105,6 +4105,7 @@ static int btusb_probe(struct usb_interface *intf,
 		/* Support is advertised, but not implemented */
 		set_bit(HCI_QUIRK_BROKEN_ERR_DATA_REPORTING, &hdev->quirks);
 		set_bit(HCI_QUIRK_BROKEN_READ_TRANSMIT_POWER, &hdev->quirks);
+		set_bit(HCI_QUIRK_BROKEN_SET_RPA_TIMEOUT, &hdev->quirks);
 		set_bit(HCI_QUIRK_BROKEN_EXT_SCAN, &hdev->quirks);
 	}
 
diff --git a/include/net/bluetooth/hci.h b/include/net/bluetooth/hci.h
index 997107bfc0b1..07df96c47ef4 100644
--- a/include/net/bluetooth/hci.h
+++ b/include/net/bluetooth/hci.h
@@ -301,6 +301,14 @@ enum {
 	 * don't actually support features declared there.
 	 */
 	HCI_QUIRK_BROKEN_LOCAL_EXT_FEATURES_PAGE_2,
+
+	/*
+	 * When this quirk is set, the HCI_OP_LE_SET_RPA_TIMEOUT command is
+	 * skipped during initialization. This is required for the Actions
+	 * Semiconductor ATS2851 based controllers, which erroneously claims
+	 * to support it.
+	 */
+	HCI_QUIRK_BROKEN_SET_RPA_TIMEOUT,
 };
 
 /* HCI device flags */
diff --git a/net/bluetooth/hci_sync.c b/net/bluetooth/hci_sync.c
index 8e5fe73873a8..003ec0e34fcc 100644
--- a/net/bluetooth/hci_sync.c
+++ b/net/bluetooth/hci_sync.c
@@ -4090,7 +4090,8 @@ static int hci_le_set_rpa_timeout_sync(struct hci_dev *hdev)
 {
 	__le16 timeout = cpu_to_le16(hdev->rpa_timeout);
 
-	if (!(hdev->commands[35] & 0x04))
+	if (!(hdev->commands[35] & 0x04) ||
+	    test_bit(HCI_QUIRK_BROKEN_SET_RPA_TIMEOUT, &hdev->quirks))
 		return 0;
 
 	return __hci_cmd_sync_status(hdev, HCI_OP_LE_SET_RPA_TIMEOUT,
@@ -4530,6 +4531,9 @@ static const struct {
 			 "HCI Set Event Filter command not supported."),
 	HCI_QUIRK_BROKEN(ENHANCED_SETUP_SYNC_CONN,
 			 "HCI Enhanced Setup Synchronous Connection command is "
+			 "advertised, but not supported."),
+	HCI_QUIRK_BROKEN(SET_RPA_TIMEOUT,
+			 "HCI LE Set Random Private Address Timeout command is "
 			 "advertised, but not supported.")
 };
 
-- 
2.39.2