This is a note to let you know that I've just added the patch titled Bluetooth: add quirk disabling LE Read Transmit Power to the 5.15-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary The filename of the patch is: bluetooth-add-quirk-disabling-le-read-transmit-power.patch and it can be found in the queue-5.15 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let <stable@xxxxxxxxxxxxxxx> know about it. >From d2f8114f9574509580a8506d2ef72e7e43d1a5bd Mon Sep 17 00:00:00 2001 From: Aditya Garg <gargaditya08@xxxxxxxx> Date: Thu, 2 Dec 2021 12:41:59 +0000 Subject: Bluetooth: add quirk disabling LE Read Transmit Power From: Aditya Garg <gargaditya08@xxxxxxxx> commit d2f8114f9574509580a8506d2ef72e7e43d1a5bd upstream. 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> Reported-by: Orlando Chamberlain <redecorating@xxxxxxxxxxxxxx> Tested-by: Orlando Chamberlain <redecorating@xxxxxxxxxxxxxx> Link: https://lore.kernel.org/r/4970a940-211b-25d6-edab-21a815313954@xxxxxxxxxxxxxx Fixes: 7c395ea521e6 ("Bluetooth: Query LE tx power on startup") Cc: stable@xxxxxxxxxxxxxxx Signed-off-by: Marcel Holtmann <marcel@xxxxxxxxxxxx> Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> --- include/net/bluetooth/hci.h | 9 +++++++++ net/bluetooth/hci_core.c | 3 ++- 2 files changed, 11 insertions(+), 1 deletion(-) --- 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 */ --- a/net/bluetooth/hci_core.c +++ b/net/bluetooth/hci_core.c @@ -742,7 +742,8 @@ static int hci_init3_req(struct hci_requ 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); Patches currently in stable-queue which might be from gargaditya08@xxxxxxxx are queue-5.15/bluetooth-add-quirk-disabling-le-read-transmit-power.patch queue-5.15/bluetooth-btbcm-disable-read-tx-power-for-macbook-air-8-1-and-8-2.patch queue-5.15/mfd-intel-lpss-fix-too-early-pm-enablement-in-the-acpi-probe.patch queue-5.15/bluetooth-btbcm-disable-read-tx-power-for-some-macs-with-the-t2-security-chip.patch