linux-kernel - [PATCH 4/6] btbcm: disable read tx power for MacBook Pro 16,4 (16 inch, 2019)

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Message-ID: <3E9D8424-A65C-4211-B5E4-B6D62400E711@live.com>
Date:   Mon, 29 Nov 2021 07:30:24 +0000
From:   Aditya Garg <gargaditya08@...e.com>
To:     Thorsten Leemhuis <regressions@...mhuis.info>
CC:     Marcel Holtmann <marcel@...tmann.org>,
        Orlando Chamberlain <redecorating@...tonmail.com>,
        Daniel Winkler <danielwinkler@...gle.com>,
        Greg KH <gregkh@...uxfoundation.org>,
        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 4/6] btbcm: disable read tx power for MacBook Pro 16,4 (16
 inch, 2019)

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

Bluetooth on Apple MacBook Pro 16,4 is unable to start due to LE Min/Max Tx Power being queried on startup. Add a DMI based quirk so that it is disabled.

Signed-off-by: Aditya Garg <gargaditya08@...e.com>
---
 drivers/bluetooth/btbcm.c | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/drivers/bluetooth/btbcm.c b/drivers/bluetooth/btbcm.c
index 348a4afa0774e..88214b453b0ce 100644
--- a/drivers/bluetooth/btbcm.c
+++ b/drivers/bluetooth/btbcm.c
@@ -363,6 +363,15 @@ static const struct dmi_system_id disable_broken_read_transmit_power[] = {
 			DMI_MATCH(DMI_PRODUCT_NAME, "MacBookPro16,2"),
 		},
 	},
+	{
+		/* Match for Apple MacBook Pro 16,4 which needs
+		 * Read LE Min/Max Tx Power to be disabled.
+		 */
+		 .matches = {
+			DMI_MATCH(DMI_BOARD_VENDOR, "Apple Inc."),
+			DMI_MATCH(DMI_PRODUCT_NAME, "MacBookPro16,4"),
+		},
+	},
 	{ }
 };