[Bug 210777] pwc driver doesn't work anymore

[Bug 210777] pwc driver doesn't work anymore

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=210777

--- Comment #3 from Harald Jenny (harald@a-little-linux-box.at) ---
The problem is presumably related to the changes in the DMA mapping in kernel
5.10 (commit 5a32c3413d3340f90c82c84b375ad4b335a59f28) as pwc uses noncoherent
DMA buffers. Reverting commit 1161db6776bd1c35257e1e362e91bcb1b3fe4347 (which
fixes performance issues) make pwc work again but opens up the orginial problem
of transfer rates on armv7l.

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[Bug 210777] pwc driver doesn't work anymore

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=210777

--- Comment #4 from Harald Jenny (harald@a-little-linux-box.at) ---
Patch by Matwey V. Kornilov from the 4th January fixes the problem in the
correct way, please consider applying it to the 5.10 as well as the 5.11 tree.

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[Bug 210777] pwc driver doesn't work anymore

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=210777

--- Comment #6 from Barto (mister.freeman@laposte.net) ---
@Harald Jenny: can you provide the link to this patch, or add it as attachment
with the bugreport ?

Thanks

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[Bug 210777] pwc driver doesn't work anymore

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=210777

--- Comment #7 from Harald Jenny (harald@a-little-linux-box.at) ---
Created attachment 294633
  --> https://bugzilla.kernel.org/attachment.cgi?id=294633&action=edit
patch for pwc courtesy of Matwey V. Kornilov

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[Bug 210777] pwc driver doesn't work anymore

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=210777

--- Comment #8 from Harald Jenny (harald@a-little-linux-box.at) ---
I attached the patch to this bug report hopefully it fixes your problem too.

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[Bug 210777] pwc driver doesn't work anymore

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=210777

--- Comment #10 from Barto (mister.freeman@laposte.net) ---
@Harald Jenny : I tested your patch, it works, my webcam works now with kernel
5.10.7,

I hope it will be applied to 5.10 and 5.11 tree.

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[Bug 210777] pwc driver doesn't work anymore

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=210777

--- Comment #11 from Harald Jenny (harald@a-little-linux-box.at) ---
That is very good to hear thanks goes to Matwey V. Kornilov for the fast patch.

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Re: [Bug 210777] pwc driver doesn't work anymore

[Greg KH]

On Thu, Jan 14, 2021 at 09:47:14PM +0000, bugzilla-daemon@bugzilla.kernel.org wrote:
> https://bugzilla.kernel.org/show_bug.cgi?id=210777
> 
> --- Comment #10 from Barto (mister.freeman@laposte.net) ---
> @Harald Jenny : I tested your patch, it works, my webcam works now with kernel
> 5.10.7,
> 
> I hope it will be applied to 5.10 and 5.11 tree.
> 

Please read Documentation/SubmittingPatches for how to properly get a
patch accepted to the kernel.  Attaching it in bugzilla does not work :)

[Bug 210777] pwc driver doesn't work anymore

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=210777

--- Comment #12 from Greg Kroah-Hartman (greg@kroah.com) ---
On Thu, Jan 14, 2021 at 09:47:14PM +0000, bugzilla-daemon@bugzilla.kernel.org
wrote:
> https://bugzilla.kernel.org/show_bug.cgi?id=210777
> 
> --- Comment #10 from Barto (mister.freeman@laposte.net) ---
> @Harald Jenny : I tested your patch, it works, my webcam works now with
> kernel
> 5.10.7,
> 
> I hope it will be applied to 5.10 and 5.11 tree.
> 

Please read Documentation/SubmittingPatches for how to properly get a
patch accepted to the kernel.  Attaching it in bugzilla does not work :)

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[Bug 210777] pwc driver doesn't work anymore

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=210777

--- Comment #13 from Harald Jenny (harald@a-little-linux-box.at) ---
The patch was just uploaded here to allow people to fix already released
kernels, patch submitter Matwey V. Kornilov took care of submitting it for
kernel inclusion. But thanks for your hint anyway :-).

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