[0/5] Use VRR timing generator for fixed refresh rate modes

Message

Nautiyal, Ankit K June 3, 2024, 1:03 p.m. UTC

Even though the VRR timing generator (TG) is primarily used for
variable refresh rates, it can be used for fixed refresh rates as
well. For a fixed refresh rate the Flip Line and Vmax must be equal
(TRANS_VRR_FLIPLINE = TRANS_VRR_VMAX). Beyond that, there are some
dependencies between the VRR timings and the legacy timing generator
registgers.

This series is an attempt to use VRR TG for fixed refresh rate.
Currently the support to use VRR timing generator for fixed refresh
rate is added from LNL+ and only for panels that support VRR, however
this can be used for older platforms also and used with panels that do
not support VRR, which will be added subsequently.
There are still few cases that need plumbing like having PSR/PSR2 with
VRR timing generator and bigjoiner + VRR.

Ankit Nautiyal (5):
  drm/i915/dp: fix the Adaptive sync Operation mode for SDP
  drm/i915/display: Add member fixed_rr to denote Fixed refresh rate
    with VRRTG
  drm/i915/dp: Set FAVT mode in DP SDP with fixed refresh rate
  drm/i915/vrr: Avoid sending PUSH when VRR TG is used with Fixed
    refresh rate
  drm/i915/vrr/xe2lpd: Use VRR timing generator whenever panel supports
    VRR

 drivers/gpu/drm/i915/display/intel_display.c  |  4 +-
 .../drm/i915/display/intel_display_types.h    |  2 +-
 drivers/gpu/drm/i915/display/intel_dp.c       |  6 +-
 drivers/gpu/drm/i915/display/intel_vrr.c      | 59 ++++++++++++-------
 4 files changed, 46 insertions(+), 25 deletions(-)