Bug 211731

Summary:	Wifi (brcmfmac) regression between 20201218 and 20210208 on Raspberry Pi 4
Product:	Drivers	Reporter:	Ruud (kernelbugzilla)
Component:	network-wireless	Assignee:	drivers_network-wireless (drivers_network-wireless)
Status:	REOPENED ---
Severity:	normal	CC:	i, kernel, mark.blakeney
Priority:	P1
Hardware:	ARM
OS:	Linux
Kernel Version:	5.10.14	Subsystem:
Regression:	Yes	Bisected commit-id:
Attachments:	Kernel logs for failed boot and good boot

Description Ruud 2021-02-13 13:05:30 UTC

Created attachment 295257 [details]
Kernel logs for failed boot and good boot

After upgrading the linux-firmware package (https://archlinuxarm.org/packages/armv8/linux-firmware) from 20201218.646f159 to 20210208.b79d239, my wlan0 interface no longer showed up in networkctl, and dmesg shows errors including

    brcmf_sdio_htclk: HT Avail timeout (1000000): clkctl 0x50

After downgrading to 20201218, everything worked fine again. This is on a Raspberry Pi model 4. I can reproduce both with kernel 5.4.83 and with kernel 5.10.14 from the Arch Linux ARM package (https://archlinuxarm.org/packages/aarch64/linux-raspberrypi4).

I can reproduce consistently, let me know if there is anything I can do to help.

Comment 1 Ruud 2021-02-14 08:05:36 UTC

I reported this to https://github.com/raspberrypi/linux/issues/4145 instead.

Comment 2 hexchain 2021-02-15 14:36:35 UTC

It seems that this also happens with the vanilla kernel (linux-aarch64 on ALARM).

Looking at https://git.kernel.org/pub/scm/linux/kernel/git/firmware/linux-firmware.git/commit/brcm?id=870b805dc77e3f7acb7e6c36944936e310be2478, manually reverting the "boardflags3" change in brcmfmac43455-sdio.raspberrypi,4-model-b.txt seems to fix the problem. In other words, change that line back to:

> boardflags3=0x44200100

fixes the issue for me.

Can we please reopen this?