[Intel-gfx] [PATCH v4 RESEND 0/4] Kernel PSR Fix-ups

[Jim Bride]

These patches, along with an upcoming series for IGT, enable our
PSR IGT tests to run reliably once again on HSW, BDW, and SKL.
The first change enables us to run the PSR tests on some RVP platforms
whose panels have too slow of a setup time when running in their
preferred mode.  The second fixes a minor problem with the way that
we were initializing SRD_CTL that caused us to clobber a bit that we
are not supposed to change in that register on SKL and KBL.  The third
change re-introduces some changes to our link training code to be less
aggressive about changing link state for eDP, because PSR depends on
the link state being the same at PSR exit as it was at PSR entry.
The fourth change greatly increases the reliability of reading the
sink CRC generated by the eDP panel.

v2 Highlights:
   * Rebased to current drm-tip
   * Greatly reduced looping around trying to read sink CRC (Jani)
   * Reduce amount of changes in the sink CRC patch (Jani)
   * Field-wise init of EDP_PSR_MAX_SLEEP_TIME (Rodrigo)
   * Minor commit message / cover letter tweaks

v3:
   * Re-ordered patches to put reviewed patches first.
   * Rebased to current drm-tip

v4: 
   * Addressed review feedback (see patches for details)
   * Rebase
   
Jim Bride (4):
  drm/i915/psr: Clean-up intel_enable_source_psr1()
  drm/i915/psr: Account for sink CRC raciness on some panels
  drm/i915/edp: Be less aggressive about changing link config on eDP
  drm/i915/edp: Allow alternate fixed mode for eDP if available.

 drivers/gpu/drm/i915/i915_reg.h               |  4 ++
 drivers/gpu/drm/i915/intel_dp.c               | 71 +++++++++++++++++++++++----
 drivers/gpu/drm/i915/intel_dp_link_training.c | 15 +++++-
 drivers/gpu/drm/i915/intel_drv.h              |  4 ++
 drivers/gpu/drm/i915/intel_dsi.c              |  2 +-
 drivers/gpu/drm/i915/intel_dvo.c              |  2 +-
 drivers/gpu/drm/i915/intel_lvds.c             |  3 +-
 drivers/gpu/drm/i915/intel_panel.c            |  6 +++
 drivers/gpu/drm/i915/intel_psr.c              | 21 +++++++-
 9 files changed, 113 insertions(+), 15 deletions(-)

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2.7.4