Thanks Robin! > > For HCs that have local memory, replace the current DMA API usage > > with a genalloc generic allocator to manage the mappings for these > > devices. > > This is in preparation for dropping the existing "coherent" dma > > mem declaration APIs. Current implementation was relying on a short > > circuit in the DMA API that in the end, was acting as an allocator > > for these type of devices. > > > > Only compiled tested, so any volunteers willing to test are most welcome. > > I recall an out-of-tree PlayStation 2 OHCI driver being another > HCD_LOCAL_MEM user - if Fredrik and Juergen are still active on that, > hopefully they might be able to comment on whether this approach can > work for them too. Patchwork link just in case: > https://patchwork.kernel.org/project/linux-usb/list/?series=117433 True. In fact I'm preparing a patch submission for this PS2 OHCI driver, along with about a hundred other patches (unrelated to the USB subsystem). Hopefully in a few weeks. My patches are currently on top of v5.0. What branch/version is recommended to try this DMA update? Here is the v5.0.11 PS2 OHCI driver, for reference: https://github.com/frno7/linux/blob/ps2-v5.0.11/drivers/usb/host/ohci-ps2.c Fredrik
