[v10,0/8] Implement CMRR Support

Message

Mitul Golani May 30, 2024, 6:04 a.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.

-v8:
- Add support for AS SDP for CMRR.
- update palce holder for CMRR register(Jani).
- Make CMRR as subset of FAVT, as per comments in patch#3.

-v9:
- Add CMRR register definitions to separate intel_vrr_reg.h.
- Remove cmrr_enabling/disabling, use vrr.enable instead.
- Update AS SDP pack function to accomodate target_rr_divider.
- Remove duplicated lines to compute vrr_vsync params.
- Set cmrr.enable with a separate patch at last.

-v10:
- Separate VRR related register definitions.
- Add dependency header intel_display_reg_defs.h.
- Rename file name to intel_vrr_regs.h instead of reg.h.
- Revert removed line.
- Since vrr.enable and cmrr.enable are not mutually exclusive,
handle accordingly.
- is_edp is not required inside is_cmrr_frac_required function.
- Add video_mode_required flag for future enhancement.
- Correct cmrr_m/cmrr_n calculation.
- target_rr_divider is bools so handle accordingly.

Mitul Golani (8):
  drm/i915: Separate VRR related register definitions
  drm/i915: Define and compute Transcoder CMRR registers
  drm/i915: Update trans_vrr_ctl flag when cmrr is computed
  drm/i915: Compute CMRR and calculate vtotal
  drm/dp: Add refresh rate divider to struct representing AS SDP
  drm/i915/display: Add support for pack and unpack
  drm/i915/display: Compute Adaptive sync SDP params
  drm/i915/display: Compute vrr vsync params

 drivers/gpu/drm/i915/display/intel_display.c  |  24 +++-
 .../drm/i915/display/intel_display_device.h   |   1 +
 .../drm/i915/display/intel_display_types.h    |   6 +
 drivers/gpu/drm/i915/display/intel_dp.c       |  21 ++-
 drivers/gpu/drm/i915/display/intel_vrr.c      | 124 ++++++++++++++--
 drivers/gpu/drm/i915/display/intel_vrr_regs.h | 133 ++++++++++++++++++
 drivers/gpu/drm/i915/i915_reg.h               | 100 -------------
 include/drm/display/drm_dp_helper.h           |   1 +
 8 files changed, 290 insertions(+), 120 deletions(-)
 create mode 100644 drivers/gpu/drm/i915/display/intel_vrr_regs.h