[Intel-gfx] [PATCH 00/10] drm/i915: Add support for asynchronous display power disabling

[Imre Deak]

This is a preparation for making hotplug useable on ICL TypeC ports. On
ICL we need a stricter control on when either kind of AUX power domain
(TBT-alt or DP-alt) is enabled. That control becomes unfeasible if the
reference can be held for arbitratry periods due to locking
dependencies. OTOH it makes sense to restrict holding the reference only
for the duration when it's actually needed. One result of that would be
the unnecessary on-off-on power togglings when the reference is dropped
and reacquired quickly.

This patchset adds support for dropping display power domain references
asynchronously with a delay to avoid the unecessary power togglings, and
restricts holding the AUX power domain reference to the sequence where
it's required during detection and HPD pulse handling.

Cc: Ville Syrjala <ville.syrjala at linux.intel.com>
Cc: Chris Wilson <chris at chris-wilson.co.uk>
Cc: Rodrigo Vivi <rodrigo.vivi at intel.com>
Cc: José Roberto de Souza <jose.souza at intel.com>

Imre Deak (10):
  drm/i915: Add support for tracking wakerefs w/o power-on guarantee
  drm/i915: Verify power domains state during suspend in all cases
  drm/i915: Add support for asynchronous display power disabling
  drm/i915: Disable power asynchronously during DP AUX transfers
  drm/i915: WARN for eDP encoders in intel_dp_detect_dpcd()
  drm/i915: Remove the unneeded AUX power ref from intel_dp_detect()
  drm/i915: Remove the unneeded AUX power ref from intel_dp_hpd_pulse()
  drm/i915: Replace use of PLLS power domain with DISPLAY_CORE domain
  drm/i915: Avoid taking the PPS lock for non-eDP/VLV/CHV
  drm/i915: Assert that TypeC ports are not used for eDP

 drivers/gpu/drm/i915/i915_drv.h         |   6 +
 drivers/gpu/drm/i915/intel_display.c    |   2 +-
 drivers/gpu/drm/i915/intel_display.h    |   2 +-
 drivers/gpu/drm/i915/intel_dp.c         |  76 ++--
 drivers/gpu/drm/i915/intel_dpll_mgr.c   |  36 +-
 drivers/gpu/drm/i915/intel_psr.c        |   6 +
 drivers/gpu/drm/i915/intel_runtime_pm.c | 443 ++++++++++++++++++++++--
 drivers/gpu/drm/i915/intel_runtime_pm.h |   4 +
 8 files changed, 491 insertions(+), 84 deletions(-)

-- 
2.17.1