Re: FreeBSD 15.0 ARM64 Display Freeze on Rockchip RK3568 - VOP2 Driver Issue

Mar 12, 2026 00:49:01 Mario Marietto <[email protected]>:

> Hello FreeBSD developers,
>
Hi! :)

> I need some help from you for the problem explained below,very thanks.
>
>  ## Hardware & System               
>  - ***Board***: Radxa Zero 3W (ARM64)
>  - ***SoC***: Rockchip RK3568
>  - ***GPU***: Mali-G52 (Panfrost driver)
>  - ***Display* *Controller***: VOP2 (Video Output Processor 2)
>  - ***OS***: FreeBSD 15.0-RELEASE-p3 (releng/15.0-n281008-5cf7232732d5)
>  - ***Kernel***: Custom RK356X-UNIFIED-KEYBOARD-FIX
>
Okay...

>  ## Problem Description
>
>  [snip]
>
>  - **FreeBSD 14.2 works perfectly** with identical hardware/configuration
>  - Cache coherency issues on ARM64 suspected due to VM changes
>
Ok, first of all...
The working Panfrost driver on RK3568???
Wow! :-O
But...where?

>  *Option* *A:* *Fix* *rk_vop20* *Driver* *(Recommended)*
>
>  *Problem* *is* *in* *the* *VOP2* *driver* *itself*, not just cache coherency.
>
>  *Investigation* *needed:*
>  1. Review rk_vop20 initialization sequence
>  2. Compare FreeBSD 14.2 vs 15.0 VOP2 code paths
>  3. Check VOP2 interrupt handling and display pipeline setup
>  4. Add delays/barriers during VOP2 initialization
>  5. Investigate VOP2 register access patterns with new VM radix tree
>
>  *Files* *to* *examine:*
>  find /usr/src -name "*vop2*" -o -name "*rk_vop*"
>  # Likely: sys/dev/drm/rockchip/rk_vop2.c or similar
>
I do not see the file rk_vop2.c in the FreeBSD-CURRENT src tree! Also, there is no drm directory, only drm2!
Which src tree are you using?
Is it some custom repository?

>  *Additional* *Information*
>
>  *DRM* *Module*: Custom unified module combining:
>  - DRM core framework
>  - Rockchip VOP2 + HDMI display driver
>  - Panfrost Mali GPU driver
>  - Module name: drm_panfrost_unified.ko
>
>  *Dependencies*: linuxkpi.ko, powerdom.ko, rk_pmdomain.ko, rk_iommu.ko
>
>  *Reproducibility*: 100% reproducible on FreeBSD 15.0. FreeBSD 14.2 works perfectly with an identical setup.
>
>  ---
>  *Goal*: Enable full GPU-accelerated X11/Wayland desktop on FreeBSD 15 ARM64 with Rockchip RK3568 without VOP2 freeze.
>
+1 for the goal!