[PATCH 1/6] Bluetooth: add quirk disabling LE Read Transmit Power

[Aditya Garg]

From: Aditya Garg <redecorating@xxxxxxxxxxxxxx>

Some devices have a bug causing them to not work if they query LE tx power on startup. Thus we add a quirk in order to not query it and default min/max tx power values to HCI_TX_POWER_INVALID.

Signed-off-by: Aditya Garg <gargaditya08@xxxxxxxx>
Tested-by: Aditya Garg <gargaditya08@xxxxxxxx>
---
 include/net/bluetooth/hci.h | 9 +++++++++
 net/bluetooth/hci_core.c    | 3 ++-
 2 files changed, 11 insertions(+), 1 deletion(-)

diff --git a/include/net/bluetooth/hci.h b/include/net/bluetooth/hci.h
index 63065bc01b766c..383342efcdc464 100644
--- a/include/net/bluetooth/hci.h
+++ b/include/net/bluetooth/hci.h
@@ -246,6 +246,15 @@ enum {
 	 * HCI after resume.
 	 */
 	HCI_QUIRK_NO_SUSPEND_NOTIFIER,
+
+	/*
+	 * When this quirk is set, LE tx power is not queried on startup
+	 * and the min/max tx power values default to HCI_TX_POWER_INVALID.
+	 *
+	 * This quirk can be set before hci_register_dev is called or
+	 * during the hdev->setup vendor callback.
+	 */
+	HCI_QUIRK_BROKEN_READ_TRANSMIT_POWER,
 };
 
 /* HCI device flags */
diff --git a/net/bluetooth/hci_core.c b/net/bluetooth/hci_core.c
index 8d33aa64846b1c..434c6878fe9640 100644
--- a/net/bluetooth/hci_core.c
+++ b/net/bluetooth/hci_core.c
@@ -619,7 +619,8 @@ static int hci_init3_req(struct hci_request *req, unsigned long opt)
 			hci_req_add(req, HCI_OP_LE_READ_ADV_TX_POWER, 0, NULL);
 		}
 
-		if (hdev->commands[38] & 0x80) {
+		if (hdev->commands[38] & 0x80 &&
+		!test_bit(HCI_QUIRK_BROKEN_READ_TRANSMIT_POWER, &hdev->quirks)) {
 			/* Read LE Min/Max Tx Power*/
 			hci_req_add(req, HCI_OP_LE_READ_TRANSMIT_POWER,
 				    0, NULL);