From:   Aditya Garg <gargaditya08@live.com>
To:     Marcel Holtmann <marcel@holtmann.org>
CC:     Greg KH <gregkh@linuxfoundation.org>,
        Thorsten Leemhuis <regressions@leemhuis.info>,
        Orlando Chamberlain <redecorating@protonmail.com>,
        Daniel Winkler <danielwinkler@google.com>,
        Johan Hedberg <johan.hedberg@intel.com>,
        "linux-bluetooth@vger.kernel.org" <linux-bluetooth@vger.kernel.org>,
        "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
        Luiz Augusto von Dentz <luiz.dentz@gmail.com>,
        "regressions@lists.linux.dev" <regressions@lists.linux.dev>,
        "sonnysasaka@chromium.org" <sonnysasaka@chromium.org>,
        "stable@vger.kernel.org" <stable@vger.kernel.org>
Subject: [PATCH v4 2/2] btbcm: disable read tx power for affected Macs with
 the T2 Security chip
Thread-Topic: [PATCH v4 2/2] btbcm: disable read tx power for affected Macs
 with the T2 Security chip
Thread-Index: AQHX5QAxoEYALVxXVEOSEdj7Vglnwg==
Date:   Mon, 29 Nov 2021 09:05:02 +0000
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From: Aditya Garg <gargaditya08@live.com>

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@live.com>
Reported-by: Orlando Chamberlain <redecorating@protonmail.com>
Link:
https://lore.kernel.org/r/4970a940-211b-25d6-edab-21a815313954@protonmail.c=
om
Fixes: 7c395ea521e6 ("Bluetooth: Query LE tx power on startup")
---
drivers/bluetooth/btbcm.c | 40 +++++++++++++++++++++++++++++++++++++++
1 file changed, 40 insertions(+)

diff --git a/drivers/bluetooth/btbcm.c b/drivers/bluetooth/btbcm.c
index e4182acee488c5..40f7c9c5cf0a5a 100644
--- 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>
@@ -343,9 +344,44 @@ static struct sk_buff *btbcm_read_usb_product(struct h=
ci_dev *hdev)
	return skb;
}

+static const struct dmi_system_id disable_broken_read_transmit_power[] =3D=
 {
+	{
+		 .matches =3D {
+			DMI_MATCH(DMI_BOARD_VENDOR, "Apple Inc."),
+			DMI_MATCH(DMI_PRODUCT_NAME, "MacBookPro16,1"),
+		},
+	},
+	{
+		 .matches =3D {
+			DMI_MATCH(DMI_BOARD_VENDOR, "Apple Inc."),
+			DMI_MATCH(DMI_PRODUCT_NAME, "MacBookPro16,2"),
+		},
+	},
+	{
+		 .matches =3D {
+			DMI_MATCH(DMI_BOARD_VENDOR, "Apple Inc."),
+			DMI_MATCH(DMI_PRODUCT_NAME, "MacBookPro16,4"),
+		},
+	},
+	{
+		 .matches =3D {
+			DMI_MATCH(DMI_BOARD_VENDOR, "Apple Inc."),
+			DMI_MATCH(DMI_PRODUCT_NAME, "iMac20,1"),
+		},
+	},
+	{
+		 .matches =3D {
+			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;
+	const struct dmi_system_id *dmi_id;

	/* Read Verbose Config Version Info */
	skb =3D btbcm_read_verbose_config(hdev);
@@ -363,6 +399,10 @@ static int btbcm_read_info(struct hci_dev *hdev)
	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;
}=