pwc driver doesn't work anymore
https://bugzilla.kernel.org/show_bug.cgi?id=210777
--- Comment #3 from Harald Jenny ([email protected]) --- 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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https://bugzilla.kernel.org/show_bug.cgi?id=210777
--- Comment #4 from Harald Jenny ([email protected]) --- 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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https://bugzilla.kernel.org/show_bug.cgi?id=210777
--- Comment #6 from Barto ([email protected]) --- @Harald Jenny: can you provide the link to this patch, or add it as attachment with the bugreport ?
Thanks
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https://bugzilla.kernel.org/show_bug.cgi?id=210777
--- Comment #7 from Harald Jenny ([email protected]) --- 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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https://bugzilla.kernel.org/show_bug.cgi?id=210777
--- Comment #8 from Harald Jenny ([email protected]) --- I attached the patch to this bug report hopefully it fixes your problem too.
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https://bugzilla.kernel.org/show_bug.cgi?id=210777
--- Comment #10 from Barto ([email protected]) --- @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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https://bugzilla.kernel.org/show_bug.cgi?id=210777
--- Comment #11 from Harald Jenny ([email protected]) --- That is very good to hear thanks goes to Matwey V. Kornilov for the fast patch.
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https://bugzilla.kernel.org/show_bug.cgi?id=210777
--- Comment #12 from Greg Kroah-Hartman ([email protected]) ---
Quoted 9 lines · On Thu, Jan 14, 2021 at 09:47:14PM +0000, [email protected]…
https://bugzilla.kernel.org/show_bug.cgi?id=210777
--- Comment #10 from Barto ([email protected]) --- @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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Quoted 8 lines · On Thu, Jan 14, 2021 at 09:47:14PM +0000, [email protected]…
https://bugzilla.kernel.org/show_bug.cgi?id=210777
--- Comment #10 from Barto ([email protected]) --- @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 :)
https://bugzilla.kernel.org/show_bug.cgi?id=210777
--- Comment #13 from Harald Jenny ([email protected]) --- 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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