linux-kernel - [PATCH v9 1/2] Bluetooth: add quirk disabling LE Read Transmit Power

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Date:   Thu, 2 Dec 2021 10:15:29 +0000
From:   Aditya Garg <gargaditya08@...e.com>
To:     Marcel Holtmann <marcel@...tmann.org>
CC:     Greg KH <gregkh@...uxfoundation.org>,
        Thorsten Leemhuis <regressions@...mhuis.info>,
        Orlando Chamberlain <redecorating@...tonmail.com>,
        Daniel Winkler <danielwinkler@...gle.com>,
        Johan Hedberg <johan.hedberg@...el.com>,
        "linux-bluetooth@...r.kernel.org" <linux-bluetooth@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Luiz Augusto von Dentz <luiz.dentz@...il.com>,
        "regressions@...ts.linux.dev" <regressions@...ts.linux.dev>,
        "sonnysasaka@...omium.org" <sonnysasaka@...omium.org>,
        "stable@...r.kernel.org" <stable@...r.kernel.org>
Subject: [PATCH v9 1/2] Bluetooth: add quirk disabling LE Read Transmit Power

From: Aditya Garg <gargaditya08@...e.com>

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@...e.com>
Reported-by: Orlando Chamberlain <redecorating@...tonmail.com>
Tested-by: Orlando Chamberlain <redecorating@...tonmail.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@...r.kernel.org
---
v7 :- Added Tested-by.
v8 :- Fix checkpatch error.
v9 :- Remake patch for Bluetooth-next tree and add Cc: stable@...r.kernel.org
 include/net/bluetooth/hci.h | 9 +++++++++
 net/bluetooth/hci_sync.c    | 3 ++-
 2 files changed, 11 insertions(+), 1 deletion(-)

diff --git a/include/net/bluetooth/hci.h b/include/net/bluetooth/hci.h
index 0d2a92168..c4959cf9a 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_sync.c b/net/bluetooth/hci_sync.c
index ad86caf41..52e6b5dae 100644
--- a/net/bluetooth/hci_sync.c
+++ b/net/bluetooth/hci_sync.c
@@ -3283,7 +3283,8 @@ 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,
-- 
2.25.1