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Subject: Re: Fwd: After kernel 6.3.7 or 6.3.8 b43 driver fails
To:     Sardonimous <sardonimous@hotmail.com>,
        Arnd Bergmann <arnd@arndb.de>,
        Bagas Sanjaya <bagasdotme@gmail.com>,
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        Kalle Valo <kvalo@kernel.org>
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From:   Larry Finger <Larry.Finger@lwfinger.net>
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On 6/26/23 16:33, Sardonimous wrote:
> 
> On 6/26/23 10:21 AM, Larry Finger wrote:
>> On 6/26/23 07:44, Sardonimous wrote:
>>> If I were to send you some test patches, could you create a kernel with them 
>>> applied?
>>>
>>> Doubtful.
>>
>> Sardonimous,
>>
>> OK, that essentially eliminates  getting DMA to work. The cost of a 
>> MacBookPro7 is too much for me to acquire one to debug that issue.
>>
>> On my PowerBook G4, I also got the failure to connect, thus I should be able 
>> to fix that problem, but getting a new kernel with the fix onto your machine 
>> will not be easy.
> 
> It might be possible to follow the arch instructions for patching the kernel
> 
> https://wiki.archlinux.org/title/Kernel/Arch_build_system
> 
> It takes about a day to rebuild the kernel following this procedure.
> 
>> Is it possible to ssh into your machine, or to use TeamViewer? Those questions 
>> do not need an answer now, but think about them.
> 
> This is complicated by being in a CGNAT environment.  I usually do this via 
> tailscale.  Will have to think about it.
> 
>> Larry
> 
> Should pio=1 qos=0 cause the problems that it does?  It if is no longer a 
> supported configuration, perhaps it should fail more gracefully.

Sardonimous,

Sorry that it took so long to get back to you.

For my ppc32, there is no regression. It took a while to learn the pio=1 and 
qos=0 are BOTH needed. That I do not understand, but with both set, the device 
works with kernel 6.4 and all earlier kernels that I tried. Fortunately, I did 
not need to do the entire bisection.

I am working on eliminating the warning that appears with qos=0, but it does not 
inhibit operations.

@Bagas Sanjaya: Please mark this "regression" as invalid.

Larry