linux-kernel - Re: [PATCH] Bluetooth: btmtk: Remove resetting mt7921 before downloading the fw

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Message-ID: <20250129183109.10770-1-jglotzer@gmail.com>
Date: Wed, 29 Jan 2025 12:31:09 -0600
From: John Glotzer <jglotzer@...il.com>
To: rtl8821cerfe2@...il.com
Cc: Aaron.Hou@...iatek.com,
	Chris.Lu@...iatek.com,
	Deren.Wu@...iatek.com,
	Hao.Qin@...iatek.com,
	Sean.Wang@...iatek.com,
	jglotzer@...il.com,
	johan.hedberg@...il.com,
	linux-bluetooth@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	linux-mediatek@...ts.infradead.org,
	luiz.dentz@...il.com,
	marc.payne@...sys.co.uk,
	marcel@...tmann.org,
	regressions@...ts.linux.dev,
	sergio.callegari@...bo.it,
	steve.lee@...iatek.com,
	tiwai@...e.de
Subject: Re: [PATCH] Bluetooth: btmtk: Remove resetting mt7921 before downloading the fw

Good news/TLDR
   Yes, so far I have resumed from sleep 2x without any issues
   with both of my workarounds disabled (kernel command line/systemd rfkill on sleep).

What I don't yet understand
   This commit
   (https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/diff/drivers/bluetooth/btusb.c?id=v6.12.8&id2=v6.12.7)
   was a pure USB fix. My mt7922 device (not a USB dongle but built into the motherboard)
   seems to be both a bluetooth device (bound to btusb driver) *and* a Wifi device (bound to mt7921e driver).

   I remain puzzled as to how is it that the issue that is on the USB side was *also* fixed by
   adding mt7921e.disable_aspm=y to the kernel command line (since that would act on the wifi/pci pathway)?