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Date:   Sun, 25 Jun 2023 16:11:20 -0500
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Subject: Re: Fwd: After kernel 6.3.7 or 6.3.8 b43 driver fails
To:     Larry Finger <Larry.Finger@lwfinger.net>,
        Arnd Bergmann <arnd@arndb.de>,
        Bagas Sanjaya <bagasdotme@gmail.com>,
        Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
        Linux Regressions <regressions@lists.linux.dev>,
        Linux Wireless <linux-wireless@vger.kernel.org>,
        Netdev <netdev@vger.kernel.org>
Cc:     =?UTF-8?Q?Michael_B=c3=bcsch?= <m@bues.ch>,
        kernel test robot <lkp@intel.com>,
        Simon Horman <simon.horman@corigine.com>,
        Kalle Valo <kvalo@kernel.org>
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On 6/25/23 13:17, Larry Finger wrote:

> On 6/25/23 13:12, Arnd Bergmann wrote:
>> On Sun, Jun 25, 2023, at 18:58, Sardonimous wrote:
>>> I have been unable to get DMA to work in the past.  So I have been
>>> configuring it with PIO=1 (/etc/modprobe,d/b43.conf):
>>>
>>>       options b43 pio=1 qos=0
>>>
>>
>> I think the qos=0 parameter is what causes the WARN_ON(), as that
>> causes the use of only one queue, while the warning happens when
>> tx function iterates over all the queues and warns that they don't
>> exist.
>
> I agree and suggest running with no options. If we need debug, we can 
> turn it on later.
>
> Larry

Sure. Of course, this is what I started out with years ago (2017?) when 
I was trying to get this to work.

Now:
Linux version 6.3.9-arch1-1 (linux@archlinux) (gcc (GCC) 13.1.1 
20230429, GNU ld (GNU Binutils) 2.40.0) #1 SMP PREEMPT_DYNAMIC Wed, 21 
Jun 2023 20:46:20 +0000

This is the sort of loop I get (dmesg | grep b43):

[   31.979539] b43-pci-bridge 0000:02:00.0: Sonics Silicon Backplane 
found on PCI device 0000:02:00.0
[   35.239389] b43-phy0: Broadcom 4322 WLAN found (core revision 16)
[   35.275018] b43-phy0: Found PHY: Analog 8, Type 4 (N), Revision 4
[   35.275046] b43-phy0: Found Radio: Manuf 0x17F, ID 0x2056, Revision 
3, Version 0
[   66.890631] b43-phy0: Loading firmware version 784.2 (2012-08-15 
21:35:19)
[   67.437162] b43-phy0 ERROR: DMA RX reset timed out
[   67.498976] b43 ssb0:0: Timeout waiting for bitmask 01800000 on 
register 0F90 to clear
[   67.707177] b43-phy0: Loading firmware version 784.2 (2012-08-15 
21:35:19)
[  391.127300] b43-phy0 ERROR: DMA RX reset timed out
[  391.360514] b43-phy0 ERROR: DMA TX reset timed out
[  391.382127] b43 ssb0:0: Timeout waiting for bitmask 01800000 on 
register 0F90 to clear
[  391.590659] b43-phy0: Loading firmware version 784.2 (2012-08-15 
21:35:19)
[  709.123840] b43-phy0 ERROR: DMA RX reset timed out
[  709.357235] b43-phy0 ERROR: DMA TX reset timed out
[  709.378623] b43 ssb0:0: Timeout waiting for bitmask 01800000 on 
register 0F90 to clear
[  709.573851] b43-phy0: Loading firmware version 784.2 (2012-08-15 
21:35:19)