[RFC,v2,0/6] Introduce MSM-specific DSC helpers

Message

Jessica Zhang March 31, 2023, 6:49 p.m. UTC

There are some overlap in calculations for MSM-specific DSC variables between DP and DSI. In addition, the calculations for initial_scale_value and det_thresh_flatness that are defined within the DSC 1.2 specifications, but aren't yet included in drm_dsc_helper.c.

This series moves these calculations to a shared msm_dsc_helper.c file and defines drm_dsc_helper methods for initial_scale_value and det_thresh_flatness.

Note: For now, the MSM specific helper methods are only called for the DSI path, but will called for DP once DSC 1.2 support for DP has been added.

Depends on: "drm/i915: move DSC RC tables to drm_dsc_helper.c" [1]

[1] https://patchwork.freedesktop.org/series/114472/

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Changes in v2:
- Changed det_thresh_flatness to flatness_det_thresh
- Moved msm_dsc_helper files to msm/ directory
- Fixed type mismatch issues in MSM DSC helpers
- Dropped MSM_DSC_SLICE_PER_PKT macro
- Removed get_comp_ratio() helper
- Style changes to improve readability
- Use drm_dsc_get_bpp_int() instead of DSC_BPP macro
- Picked up Fixes tags for patches 3/5 and 4/5
- Picked up Reviewed-by for patch 4/5
- Split eol_byte_num and pkt_per_line calculation into a separate patch
- Moved pclk_per_line calculation into `if (dsc)` block in
  dsi_timing_setup()
- Link to v1: https://lore.kernel.org/r/[e-mail]

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Jessica Zhang (6):
      drm/display/dsc: Add flatness and initial scale value calculations
      drm/msm: Add MSM-specific DSC helper methods
      drm/msm/dpu: Use DRM DSC helper for det_thresh_flatness
      drm/msm/dpu: Fix slice_last_group_size calculation
      drm/msm/dsi: Use MSM and DRM DSC helper methods
      drm/msm/dsi: Fix calculations for eol_byte_num and pkt_per_line

 drivers/gpu/drm/msm/Makefile               |  1 +
 drivers/gpu/drm/msm/disp/dpu1/dpu_hw_dsc.c | 10 ++++--
 drivers/gpu/drm/msm/dsi/dsi_host.c         | 21 ++++++++----
 drivers/gpu/drm/msm/msm_dsc_helper.c       | 53 ++++++++++++++++++++++++++++++
 drivers/gpu/drm/msm/msm_dsc_helper.h       | 42 +++++++++++++++++++++++
 include/drm/display/drm_dsc_helper.h       | 11 +++++++
 6 files changed, 129 insertions(+), 9 deletions(-)
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base-commit: 56777fc93a145afcf71b92ba4281250f59ba6d9b
change-id: 20230329-rfc-msm-dsc-helper-981a95edfbd0

Best regards,