linux-kernel - [BUG] BCM4377 wifi chip fails to suspend and resume

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Message-ID: <6BDCB30A-8D6E-4071-83FF-C7CFBFF39224@live.com>
Date: Thu, 6 Mar 2025 19:30:04 +0000
From: Aditya Garg <gargaditya08@...e.com>
To: Arend van Spriel <arend.vanspriel@...adcom.com>, Sven Peter
	<sven@...npeter.dev>, Janne Grunau <j@...nau.net>
CC: Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	"linux-wireless@...r.kernel.org" <linux-wireless@...r.kernel.org>
Subject: [BUG] BCM4377 wifi chip fails to suspend and resume

Hi all

This bug has been there for a long time. BCM4377 wifi chip, found on T2 Macs, fails to suspend and resume. As far as I understand, it’s similar to BCM4378 found on Apple Silicon? Anyways, relevant logs:

Journalctl: https://pastebin.com/RTktHgG2

Which this being most relevant IMO:

Mar 06 14:08:40 melvin-MacBookPro kernel: brcmfmac 0000:01:00.0: brcmf_pcie_pm_enter_D3: Timeout on response for entering D3 substate
Mar 06 14:08:40 melvin-MacBookPro kernel: brcmfmac 0000:01:00.0: PM: pci_pm_suspend(): brcmf_pcie_pm_enter_D3 [brcmfmac] returns -5
Mar 06 14:08:40 melvin-MacBookPro kernel: brcmfmac 0000:01:00.0: PM: dpm_run_callback(): pci_pm_suspend returns -5
Mar 06 14:08:40 melvin-MacBookPro kernel: brcmfmac 0000:01:00.0: PM: failed to suspend async: error -5
Mar 06 14:08:40 melvin-MacBookPro kernel: PM: Some devices failed to suspend, or early wake event detected

Kernel config: https://pastebin.com/wxbRNA0W