[RFC PATCH] dmaengine: xilinx_dma: Fix per-channel direction reporting via device_caps

[Marek Vasut]

On 3/17/26 11:49 AM, Rahul Navale wrote:
> From: Rahul Navale <rahul.navale at ifm.com>
> 
> Hi Folker,
> 
>> Just to double check, and to make sure the regression you're seeing is
>> not a combination of any additional, yet unknown side-effects, could you
>> perform one more test?
>> In dmaengine_pcm_pointer() (the function we just patched), could you
>> replace the call to snd_dmaengine_pcm_pointer() with
>> snd_dmaengine_pcm_pointer_no_residue() while keeping 7e01511443c3 active
>> and test if this fixes your issue or not?
> 
> I have performed the test (replace the call in dmaengine_pcm_pointer()
> function of provided patch) while keeping 7e01511443c3 active.
> I see issue is fixed audio is working with this.
> 
> Hi Marek,
> 
>> I came to the same conclusion, that the residue handling is broken in
>> the xilinx DMA driver for cyclic transfers, and the fix is below, with
>> two extra fixes in top:
> 
> I have tested the provided patches the audio is not fixed with this.
Do you have any other patches applied on the xilinx DMA driver by any 
chance ? If yes, make sure you only test these three.