This is a note to let you know that I've just added the patch titled
Bluetooth: btbcm: disable read tx power for some Macs with the T2 Security chip
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-btbcm-disable-read-tx-power-for-some-macs-with-the-t2-security-chip.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 801b4c027b44a185292007d3cf7513999d644723 Mon Sep 17 00:00:00 2001
From: Aditya Garg <gargaditya08@xxxxxxxx>
Date: Thu, 2 Dec 2021 12:42:59 +0000
Subject: Bluetooth: btbcm: disable read tx power for some Macs with the T2 Security chip
From: Aditya Garg <gargaditya08@xxxxxxxx>
commit 801b4c027b44a185292007d3cf7513999d644723 upstream.
Some Macs with the T2 security chip had Bluetooth not working.
To fix it we add DMI based quirks to disable querying of LE Tx power.
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>
---
drivers/bluetooth/btbcm.c | 39 +++++++++++++++++++++++++++++++++++++++
1 file changed, 39 insertions(+)
--- a/drivers/bluetooth/btbcm.c
+++ b/drivers/bluetooth/btbcm.c
@@ -8,6 +8,7 @@
#include <linux/module.h>
#include <linux/firmware.h>
+#include <linux/dmi.h>
#include <asm/unaligned.h>
#include <net/bluetooth/bluetooth.h>
@@ -343,6 +344,40 @@ static struct sk_buff *btbcm_read_usb_pr
return skb;
}
+static const struct dmi_system_id disable_broken_read_transmit_power[] = {
+ {
+ .matches = {
+ DMI_MATCH(DMI_BOARD_VENDOR, "Apple Inc."),
+ DMI_MATCH(DMI_PRODUCT_NAME, "MacBookPro16,1"),
+ },
+ },
+ {
+ .matches = {
+ DMI_MATCH(DMI_BOARD_VENDOR, "Apple Inc."),
+ DMI_MATCH(DMI_PRODUCT_NAME, "MacBookPro16,2"),
+ },
+ },
+ {
+ .matches = {
+ DMI_MATCH(DMI_BOARD_VENDOR, "Apple Inc."),
+ DMI_MATCH(DMI_PRODUCT_NAME, "MacBookPro16,4"),
+ },
+ },
+ {
+ .matches = {
+ DMI_MATCH(DMI_BOARD_VENDOR, "Apple Inc."),
+ DMI_MATCH(DMI_PRODUCT_NAME, "iMac20,1"),
+ },
+ },
+ {
+ .matches = {
+ DMI_MATCH(DMI_BOARD_VENDOR, "Apple Inc."),
+ DMI_MATCH(DMI_PRODUCT_NAME, "iMac20,2"),
+ },
+ },
+ { }
+};
+
static int btbcm_read_info(struct hci_dev *hdev)
{
struct sk_buff *skb;
@@ -363,6 +398,10 @@ static int btbcm_read_info(struct hci_de
bt_dev_info(hdev, "BCM: features 0x%2.2x", skb->data[1]);
kfree_skb(skb);
+ /* Read DMI and disable broken Read LE Min/Max Tx Power */
+ if (dmi_first_match(disable_broken_read_transmit_power))
+ set_bit(HCI_QUIRK_BROKEN_READ_TRANSMIT_POWER, &hdev->quirks);
+
return 0;
}
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
