[PATCH 0/1][SRU][E] Fix i915 power use regression in 5.3

[Seth Forshee]

SRU Justification

BugLink: https://bugs.launchpad.net/bugs/1853044

Impact: "drm/i915/gen8+: Add RC6 CTX corruption WA" makes it effectively
impossible to enter RC6 for some Intel GPUs when a display server is running.
This results in increased energy usage and temperature.

Fix: Upstream has changed too much to make the fixes there applicable, but
Chris Wilson has provided a patch for 5.3, here:
https://gitlab.freedesktop.org/drm/intel/issues/614#note_366057

Test Case: See test results on the bug. On an affected machine powertop will
show increased RC6 usage on an idle desktop after the patch, and other symptoms
of excessive power use should also subside.

Regression Potential: The 5.3 patch is pretty straightforward, and only adds
running of an existing delayed worker to retire GPU requests. No regressions
have been reported in testing so far.

Thanks,
Seth

---

Chris Wilson (1):
  drm/i915: Schedue request retirement in execlists_user_end()

 drivers/gpu/drm/i915/gt/intel_lrc.c | 4 ++++
 1 file changed, 4 insertions(+)