rk3399 issue: no DMA in Linux with mainline TF-A and U-Boot SPL

[Christoph Fritz]

Hello Jonathan and Kevar,

> I also see this issue when switching between Rockchip ATF and Upstream ATF.
> 
> Versions:
> Rockchip DDR Blob - rk3399_ddr_800MHz_v1.30.bin
> Rockchip Miniloader - rk3399_miniloader_v1.30.bin
> Rockchip ATF - rk3399_bl31_v1.36.elf
> Upstream ATF - git://git.trustedfirmware.org/TF-A/trusted-firmware-a.git,
> git tag v2.8.0, with RK3399_BAUDRATE changed from 115200 to 1500000 in
> plat/rockchip/rk3399/rk3399_def.h
> U-Boot - git://git.denx.de/u-boot.git, git tag v2022.01
> 
> Results:
> Rockchip DDR Blob + Rockchip Miniloader + Rockchip ATF + U-Boot = DMA working
>   dma-pl330 ff6d0000.dma-controller: Loaded driver for PL330 DMAC-241330
>   dma-pl330 ff6d0000.dma-controller:       DBUFF-32x8bytes Num_Chans-6
> Num_Peri-12 Num_Events-12
>   dma-pl330 ff6e0000.dma-controller: Loaded driver for PL330 DMAC-241330
>   dma-pl330 ff6e0000.dma-controller:       DBUFF-128x8bytes
> Num_Chans-8 Num_Peri-20 Num_Events-16
> Rockchip DDR Blob + Rockchip Miniloader + Upstream ATF + U-Boot = DMA
> not working
>   OF: amba_device_add() failed (-19) for /bus/dma-controller at ff6d0000
>   OF: amba_device_add() failed (-19) for /bus/dma-controller at ff6e0000
> 
> I can't check the Rockchip ATF source code as it isn't available.
> Any idea what is different between Rockchip ATF and Upstream ATF for
> DMA to work properly?

@Kevar: It would be really great if you could have a look into it.

I am still having this issue.

Thanks
  -- Christoph