On 21 November 2019 at 07:02 pm, Christoph Hellwig wrote:
> On Thu, Nov 21, 2019 at 05:34:48PM +0100, Christian Zigotzky wrote:
>> I modified the patch and compiled a new RC8 of kernel 5.4 today. (patch
>> attached)
>>
>> We have to wait to Rolands test results with his SCSI PCI card. I tested it
>> today but my TV card doesn't work with this patch.
> I think we have two sorta overlapping issues here.  One is that I think
> we need the bus_dma_limit, which should mostly help for something like
> a SCSI controller that doesn't need streaming mappings (btw, do we
> have more details on that somewhere?).
>
> And something weird with the videobuf things.  Your change of the dma
> masks suggests that the driver doesn't do the right allocations and thus
> hits bounce buffering (swiotlb).  We should fix that for real, but the
> fact that the bounce buffering itself also fails is even more interesting.
>
> Can you try this git branch:
>
>      git://git.infradead.org/users/hch/misc.git fsl-dma-debugging
>
> Gitweb:
>
>      http://git.infradead.org/users/hch/misc.git/shortlog/refs/heads/fsl-dma-debugging
>
> and send me the dmesg with that with your TV adapter?
>
Hello Christoph,

Please find attached the dmesg of your Git kernel.

Thanks,
Christian