[Bug 110886] After S3 resume, kernel: [drm:drm_atomic_helper_wait_for_flip_done [drm_kms_helper]] *ERROR* [CRTC:57:crtc-0] flip_done timed out

https://bugs.freedesktop.org/show_bug.cgi?id=110886

--- Comment #12 from Kai-Heng Feng kai.heng.feng@canonical.com ---

Now it always shows PSP fail.

I've dug up more info about this issue. It always times out in psp_cmd_submit_buf(). Particularly, this code section:

while (*((unsigned int *)psp->fence_buf) != index) { if (--timeout == 0) break; msleep(1); }

psp->fence_buf stuck at 406 and index stuck at 407 and it eventually times out. This _always_ happens at 27th time of S3, and freeze the whole system at 28th S3 attempt.