[PATCH v3 0/6] Introduce MSM-specific DSC helpers

[Jessica Zhang]

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/

---
Changes in v3:
- Cleaned up unused parameters
- Reworded some calculations for clarity
- Changed get_bytes_per_soft_slice() to a public method
- Added comment documentation to MSM DSC helpers
- Changed msm_dsc_get_eol_byte_num() to *_get_bytes_per_intf()
- Split dsi_timing_setup() hdisplay calculation to a separate patch
- Dropped 78c8b81d57d8 ("drm/display/dsc: Add flatness and initial scale
  value calculations") patch as it was absorbed in Dmitry's DSC series [1]
- Link to v2: https://lore.kernel.org/r/20230329-rfc-msm-dsc-helper-v2-0-3c13ced536b2@quicinc.com

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/20230329-rfc-msm-dsc-helper-v1-0-f3e479f59b6d@quicinc.com

---
Jessica Zhang (6):
      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: update hdisplay calculation for dsi_timing_setup
      drm/msm/dsi: Fix calculations pkt_per_line

 drivers/gpu/drm/msm/Makefile               |  1 +
 drivers/gpu/drm/msm/disp/dpu1/dpu_hw_dsc.c |  9 ++--
 drivers/gpu/drm/msm/dsi/dsi_host.c         | 22 ++++++++--
 drivers/gpu/drm/msm/msm_dsc_helper.c       | 47 ++++++++++++++++++++
 drivers/gpu/drm/msm/msm_dsc_helper.h       | 70 ++++++++++++++++++++++++++++++
 5 files changed, 142 insertions(+), 7 deletions(-)
---
base-commit: 56777fc93a145afcf71b92ba4281250f59ba6d9b
change-id: 20230329-rfc-msm-dsc-helper-981a95edfbd0

Best regards,
-- 
Jessica Zhang <quic_jesszhan at quicinc.com>