[0/3] Implement CMRR Support

Message

Golani, Mitulkumar Ajitkumar April 12, 2024, 5:31 p.m. UTC

CMRR is a display feature that uses adaptive sync
framework to vary Vtotal slightly to match the
content rate exactly without frame drops. This
feature is a variation of VRR where it varies Vtotal
slightly (between additional 0 and 1 Vtotal scanlines)
to match content rate exactly without frame drops
using the adaptive sync framework.

enable this feature by programing new registers for
CMRR enable, CMRR_M, CMRR_N, vmin=vmax=flipline.The
CMRR_M/CMRR_N ratio represents the fractional part
in (actual refresh rate/target refresh rate) * origVTotal.

--v6:
- CMRR handling in co-existatnce of LRR and DRRS
- Correct vtotal paramas accuracy and add 2 digit precision.

--v7:
- Rebased patches in-accordance to AS SDP merge.
- Add neccessary gaurd to prevent crtc_state mismatch
during intel_vrr_get_config.

Mitul Golani (3):
  drm/i915: Define and compute Transcoder CMRR registers
  drm/i915: Add Enable/Disable for CMRR based on VRR state
  drm/i915: Compute CMRR and calculate vtotal

 drivers/gpu/drm/i915/display/intel_display.c  |  61 ++++++-
 .../drm/i915/display/intel_display_device.h   |   1 +
 .../drm/i915/display/intel_display_types.h    |   6 +
 drivers/gpu/drm/i915/display/intel_vrr.c      | 153 +++++++++++++++---
 drivers/gpu/drm/i915/i915_reg.h               |  10 ++
 5 files changed, 201 insertions(+), 30 deletions(-)