linux-kernel - [REGRESSION] Bluetooth is not working on Macs with BCM4377 chip starting from kernel 6.5

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Message-ID: <22582194-DE99-45E5-ABEE-C1C7900DA523@live.com>
Date:   Mon, 13 Nov 2023 20:57:35 +0000
From:   Aditya Garg <gargaditya08@...e.com>
To:     Hector Martin <marcan@...can.st>, Sven Peter <sven@...npeter.dev>,
        Alyssa Rosenzweig <alyssa@...enzweig.io>,
        "marcel@...tmann.org" <marcel@...tmann.org>,
        "johan.hedberg@...il.com" <johan.hedberg@...il.com>,
        "luiz.dentz@...il.com" <luiz.dentz@...il.com>
CC:     Orlando Chamberlain <orlandoch.dev@...il.com>,
        Kerem Karabay <kekrby@...il.com>,
        Aun-Ali Zaidi <admin@...eit.net>,
        Asahi Linux <asahi@...ts.linux.dev>,
        LKML <linux-kernel@...r.kernel.org>,
        "linux-bluetooth@...r.kernel.org" <linux-bluetooth@...r.kernel.org>
Subject: [REGRESSION] Bluetooth is not working on Macs with BCM4377 chip
 starting from kernel 6.5

Starting from kernel 6.5, a regression in the kernel is causing Bluetooth to not work on T2 Macs with BCM4377 chip.

Journalctl of kernel 6.4.8 which has Bluetooth working is given here: https://pastebin.com/u9U3kbFJ

Journalctl of kernel 6.5.2, which has Bluetooth broken is given here: https://pastebin.com/aVHNFMRs

Also, the bug hasn’t been fixed even in 6.6.1, as reported by users.

Some relevant bits imo:

    • Sep 19 21:24:36 RudyUbuMbp kernel: hci_bcm4377 0000:73:00.1: can't disable ASPM; OS doesn't have ASPM control

    • Nov 14 01:29:28 RudyUbuMbp kernel: Call Trace:
    • Nov 14 01:29:28 RudyUbuMbp kernel: <TASK>
    • Nov 14 01:29:28 RudyUbuMbp kernel: dump_stack_lvl+0x48/0x70
    • Nov 14 01:29:28 RudyUbuMbp kernel: dump_stack+0x10/0x20
    • Nov 14 01:29:28 RudyUbuMbp kernel: __ubsan_handle_shift_out_of_bounds+0x156/0x310
    • Nov 14 01:29:28 RudyUbuMbp kernel: ? ttwu_do_activate+0x80/0x290
    • Nov 14 01:29:28 RudyUbuMbp kernel: ? raw_spin_rq_unlock+0x10/0x40
    • Nov 14 01:29:28 RudyUbuMbp kernel: ? try_to_wake_up+0x292/0x6c0
    • Nov 14 01:29:28 RudyUbuMbp kernel: ? sched_slice+0x76/0x140
    • Nov 14 01:29:28 RudyUbuMbp kernel: ? reweight_entity+0x15c/0x170
    • Nov 14 01:29:28 RudyUbuMbp kernel: __reg_op.cold+0x14/0x38
    • Nov 14 01:29:28 RudyUbuMbp kernel: bitmap_release_region+0xe/0x20
    • Nov 14 01:29:28 RudyUbuMbp kernel: bcm4377_handle_ack+0x8c/0x130 [hci_bcm4377]
    • Nov 14 01:29:28 RudyUbuMbp kernel: bcm4377_poll_completion_ring+0x196/0x330 [hci_bcm4377]
    • Nov 14 01:29:28 RudyUbuMbp kernel: ? rcu_gp_kthread_wake+0x57/0x90
    • Nov 14 01:29:28 RudyUbuMbp kernel: bcm4377_irq+0x77/0x140 [hci_bcm4377]
    • Nov 14 01:29:28 RudyUbuMbp kernel: __handle_irq_event_percpu+0x4c/0x1b0
    • Nov 14 01:29:28 RudyUbuMbp kernel: handle_irq_event+0x39/0x80
    • Nov 14 01:29:28 RudyUbuMbp kernel: handle_edge_irq+0x8c/0x250
    • Nov 14 01:29:28 RudyUbuMbp kernel: __common_interrupt+0x4f/0x110
    • Nov 14 01:29:28 RudyUbuMbp kernel: common_interrupt+0x45/0xb0
    • Nov 14 01:29:28 RudyUbuMbp kernel: asm_common_interrupt+0x27/0x40
    • Nov 14 01:29:28 RudyUbuMbp kernel: RIP: 0033:0x7f17b5fd8bca