On 8/15/2025 4:13 PM, Alexander Wilhelm wrote: > Hello devs, > > I'm currently working on getting the 'ath12k' driver running on a big endian > PowerPC platform and have encountered the following issue. > > In the function 'ath12k_dp_rx_process_reo_status', the REO status is determined > by inspecting memory that the hardware has previously written via DMA. > Specifically, during the call to 'ath12k_hal_srng_access_begin', the driver > reads the value of 'hp_addr' for the destination ring (in my case, always with > ID 21). On the big endian platform, this value is consistently 0, which prevents > the REO status from being updated. This does not seem an endian issue to me, because either of them we should get a value other than 0. > > Interestingly, DMA read/write accesses work fine for other rings, just not for > this one. What makes the REO status ring so special? I couldn’t find anything in > the initialization routine that would explain the difference. > > Could anyone give me a hint on what I should be looking for? > > What hardware are you using? WCN7850 or QCN9274? > Best regards > Alexander Wilhelm >
