igt@i915_pm_dc@dc(5|6)-[dpms|psr] - fail - Failed assertion: dc_state_wait_entry(data->debugfs_fd, dc_flag, prev_dc_count),DC(5|6) state is not achieved

https://intel-gfx-ci.01.org/tree/drm-tip/CI_DRM_10490/shard-rkl-5/igt@i915_pm_dc@dc6-dpms.html

Out	
IGT-Version: 1.26-gf474644e7 (x86_64) (Linux: 5.14.0-rc6-CI-CI_DRM_10490+ x86_64)
DMC: fw loaded: yes
Starting subtest: dc6-dpms
Stack trace:
  #0 ../lib/igt_core.c:1745 __igt_fail_assert()
  #1 ../tests/i915/i915_pm_dc.c:221 check_dc_counter.isra.3()
  #2 [<unknown>+0xdbd]
  #3 [<unknown>+0x8]
Subtest dc6-dpms: FAIL (3.259s)
Err	
Starting subtest: dc6-dpms
(i915_pm_dc:1393) CRITICAL: Test assertion failure function check_dc_counter, file ../tests/i915/i915_pm_dc.c:220:
(i915_pm_dc:1393) CRITICAL: Failed assertion: dc_state_wait_entry(data->debugfs_fd, dc_flag, prev_dc_count)
(i915_pm_dc:1393) CRITICAL: DC6 state is not achieved