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Sender: Larry Finger <larry.finger@gmail.com>
Message-ID: <8b86edab-5bd6-cab0-f8f8-f5c6bc757988@lwfinger.net>
Date:   Mon, 19 Dec 2022 16:53:23 -0600
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Subject: Re: [bug report] rtw88 / 8821cu driver missing firmware
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To:     Ingo Saitz <ingo@hannover.ccc.de>, linux-wireless@vger.kernel.org
References: <Y6Bnc+UUY3R/nc6L@spatz.zoo>
From:   Larry Finger <Larry.Finger@lwfinger.net>
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On 12/19/22 07:30, Ingo Saitz wrote:
> I saw the 8821cu chipset being merged for linus' next kernel release and
> decided to give it a try. I have been running 8821cu from
> https://github.com/morrownr/8821cu-20210118  succeffully, so I know my
> hardware works.
> 
> The driver as merged in commit 07cef03b8d44dee7488de3d1585387e603c78676
> to git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
> can't find any firmware for the driver, and the card does not work. At
> boot it repeatedly logged failures to my kernel.log:
> 
> 2022-12-16T19:20:21.563669+01:00 pinguin kernel: [    7.823614] rtw_8821cu 2-11:1.0: Firmware version 24.11.0, H2C version 12
> 2022-12-16T19:20:21.563670+01:00 pinguin kernel: [    7.906497] usbcore: registered new interface driver rtw_8821cu
> 2022-12-16T19:20:21.563670+01:00 pinguin kernel: [    7.930657] rtw_8821cu 2-11:1.0 wlx1cbfcefeb2a3: renamed from wlan0
> 2022-12-16T19:20:59.576907+01:00 pinguin kernel: [  631.847796] rtw_8821cu 2-11:1.0: failed to download firmware
> 2022-12-16T19:20:59.576910+01:00 pinguin kernel: [  631.849195] rtw_8821cu 2-11:1.0: leave idle state failed
> 2022-12-16T19:20:59.580239+01:00 pinguin kernel: [  631.851635] rtw_8821cu 2-11:1.0: failed to leave ips state
> 2022-12-16T19:20:59.580241+01:00 pinguin kernel: [  631.851636] rtw_8821cu 2-11:1.0: failed to leave idle state
> 2022-12-16T19:21:08.563579+01:00 pinguin kernel: [  640.833372] rtw_8821cu 2-11:1.0: error beacon valid
> 2022-12-16T19:21:08.563590+01:00 pinguin kernel: [  640.833480] rtw_8821cu 2-11:1.0: failed to download rsvd page
> 2022-12-16T19:21:08.563591+01:00 pinguin kernel: [  640.833640] rtw_8821cu 2-11:1.0: failed to download firmware
> 2022-12-16T19:21:08.563591+01:00 pinguin kernel: [  640.835040] rtw_8821cu 2-11:1.0: leave idle state failed
> 2022-12-16T19:21:08.566911+01:00 pinguin kernel: [  640.837510] rtw_8821cu 2-11:1.0: failed to leave ips state
> 2022-12-16T19:21:08.566915+01:00 pinguin kernel: [  640.837513] rtw_8821cu 2-11:1.0: failed to leave idle state
> 2022-12-16T19:21:17.550263+01:00 pinguin kernel: [  649.820641] rtw_8821cu 2-11:1.0: error beacon valid
> 2022-12-16T19:21:17.550288+01:00 pinguin kernel: [  649.820759] rtw_8821cu 2-11:1.0: failed to download rsvd page
> 
> There is no mention of what firmware would be needed in the source code
> itself, yet the repositoryhttps://github.com/ulli-kroll/rtl8821cu
> includes a file firmware/rtl8821cufw.bin.

The firmware that is needed is the same as for the PCIe nersion, namely 
/lib/firmware/rtw88/rtw8821c_fw.bin. Your distro should have that firmware in 
package firmware-realtek, or in linux-firmware-realtek. If they do not, you can 
get it by 'git clone 
git://git.kernel.org/pub/scm/linux/kernel/git/firmware/linux-firmware.git. The 
firware will be in directory rtw88.

Larry