Bluetooth: add quirk disabling LE Read Transmit Power

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@live.com>
Reported-by: Orlando Chamberlain <redecorating@protonmail.com>
Tested-by: Orlando Chamberlain <redecorating@protonmail.com>
Link:
https://lore.kernel.org/r/4970a940-211b-25d6-edab-21a815313954@protonmail.com
Fixes: 7c395ea521e6 ("Bluetooth: Query LE tx power on startup")
Cc: stable@vger.kernel.org
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>

diff --git a/include/net/bluetooth/hci.h b/include/net/bluetooth/hci.h
index 4343f79..c5f6b82 100644 (file)
--- 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_sync.c b/net/bluetooth/hci_sync.c
index 7ac6c17..ff3f561 100644 (file)
--- a/net/bluetooth/hci_sync.c
+++ b/net/bluetooth/hci_sync.c
@@ -3300,7 +3300,8 @@ static int hci_le_read_adv_tx_power_sync(struct hci_dev *hdev)
 /* Read LE Min/Max Tx Power*/
 static int hci_le_read_tx_power_sync(struct hci_dev *hdev)
 {
-       if (!(hdev->commands[38] & 0x80))
+       if (!(hdev->commands[38] & 0x80) ||
+           test_bit(HCI_QUIRK_BROKEN_READ_TRANSMIT_POWER, &hdev->quirks))
                return 0;
 
        return __hci_cmd_sync_status(hdev, HCI_OP_LE_READ_TRANSMIT_POWER,