In fact please rebase latest drm-next from here - https://cgit.freedesktop.org/~agd5f/linux/log/?h=amd-staging-drm-next, there are 2 changes by Alex in communication with PSP with might help drm/amdgpu/psp: invalidate the hdp read cache before reading the psp response drm/amdgpu/psp: flush HDP write fifo after submitting cmds to the psp See if the PSP errors go away with that.