[Intel-gfx] [PATCH v3 00/25] drm/i915: Improve BW management on shared display links

[Imre Deak]

This is v3 of [1] addressing the review comments, adding R-bs
and the following changes based on further testing / offline
discussions:

- Return -ENOSPC to userspace in case of a link BW limit
  failure. (Patch 9, thanks to Karthik B S for the related IGT
  testing)
- Replace fractional bpp fix with a patch from Ville. (Patch 12)
- Disable DSC PPS SDP during output disabling. (Patch 20, Ville)

[1] https://lore.kernel.org/intel-gfx/20230824080517.693621-1-imre.deak@intel.com

Cc: Jani Nikula <jani.nikula at linux.intel.com>
Cc: Stanislav Lisovskiy <stanislav.lisovskiy at intel.com>
Cc: Lyude Paul <lyude at redhat.com>
Cc: Ville Syrjälä <ville.syrjala at linux.intel.com>
Cc: Luca Coelho <luciano.coelho at intel.com>

Imre Deak (24):
  drm/i915/dp: Factor out helpers to compute the link limits
  drm/i915/dp: Track the pipe and link bpp limits separately
  drm/i915/dp: Skip computing a non-DSC link config if DSC is needed
  drm/i915/dp: Update the link bpp limits for DSC mode
  drm/i915/dp: Limit the output link bpp in DSC mode
  drm/i915: Add helper to modeset a set of pipes
  drm/i915: During modeset forcing handle inactive but enabled pipes
  drm/i915: Factor out a helper to check/compute all the CRTC states
  drm/i915: Add helpers for BW management on shared display links
  drm/i915/fdi: Improve FDI BW sharing between pipe B and C
  drm/i915/fdi: Recompute state for affected CRTCs on FDI links
  drm/dp_mst: Add a way to calculate PBN values with FEC overhead
  drm/dp_mst: Add helper to determine if an MST port is downstream of
    another port
  drm/dp_mst: Factor out a helper to check the atomic state of a
    topology manager
  drm/dp_mst: Swap the order of checking root vs. non-root port BW
    limitations
  drm/i915/dp_mst: Fix PBN calculation with FEC overhead
  drm/i915/dp_mst: Add atomic state for all streams on pre-tgl platforms
  drm/i915/dp_mst: Program the DSC PPS SDP for each stream
  drm/i915/dp: Make sure the DSC PPS SDP is disabled whenever DSC is
    disabled
  drm/i915/dp_mst: Enable DSC decompression if any stream needs this
  drm/i915/dp_mst: Add missing DSC compression disabling
  drm/i915/dp_mst: Allow DSC only for sink ports of the first branch
    device
  drm/i915/dp_mst: Improve BW sharing between MST streams
  drm/i915/dp_mst: Check BW limitations only after all streams are
    computed

Ville Syrjälä (1):
  drm/dp_mst: Fix fractional DSC bpp handling

 .../gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c |   2 +-
 .../display/amdgpu_dm/amdgpu_dm_mst_types.c   |   2 +-
 drivers/gpu/drm/display/drm_dp_mst_topology.c | 181 ++++++++---
 drivers/gpu/drm/i915/Makefile                 |   1 +
 drivers/gpu/drm/i915/display/g4x_hdmi.c       |   6 +-
 drivers/gpu/drm/i915/display/intel_cdclk.c    |   2 +-
 drivers/gpu/drm/i915/display/intel_crt.c      |   7 +
 drivers/gpu/drm/i915/display/intel_crtc.c     |   1 +
 drivers/gpu/drm/i915/display/intel_ddi.c      |  12 +-
 drivers/gpu/drm/i915/display/intel_display.c  | 203 +++++++++----
 drivers/gpu/drm/i915/display/intel_display.h  |   6 +-
 .../drm/i915/display/intel_display_types.h    |  26 +-
 drivers/gpu/drm/i915/display/intel_dp.c       | 196 +++++++++---
 drivers/gpu/drm/i915/display/intel_dp.h       |  17 +-
 drivers/gpu/drm/i915/display/intel_dp_mst.c   | 287 +++++++++++++++---
 drivers/gpu/drm/i915/display/intel_dp_mst.h   |   3 +
 drivers/gpu/drm/i915/display/intel_fdi.c      | 140 +++++++--
 drivers/gpu/drm/i915/display/intel_fdi.h      |   5 +
 drivers/gpu/drm/i915/display/intel_link_bw.c  | 244 +++++++++++++++
 drivers/gpu/drm/i915/display/intel_link_bw.h  |  39 +++
 drivers/gpu/drm/i915/display/intel_lvds.c     |  10 +-
 drivers/gpu/drm/i915/display/intel_sdvo.c     |  10 +-
 drivers/gpu/drm/i915/display/skl_watermark.c  |   2 +-
 drivers/gpu/drm/nouveau/dispnv50/disp.c       |   3 +-
 .../gpu/drm/tests/drm_dp_mst_helper_test.c    |  19 +-
 include/drm/display/drm_dp_mst_helper.h       |   9 +-
 26 files changed, 1203 insertions(+), 230 deletions(-)
 create mode 100644 drivers/gpu/drm/i915/display/intel_link_bw.c
 create mode 100644 drivers/gpu/drm/i915/display/intel_link_bw.h

-- 
2.37.2