[PATCH v6 0/6] Add DSC v1.2 Support for DSI

[Jessica Zhang]

This is a series of changes for DSI to enable command mode support
for DSC v1.2.

This includes:

1) Rounding up `hdisplay / 3` in dsc_timing_setup()
2) Adjusting pclk_rate to account for compression
3) Fixing incorrect uses of slice_count in DSI DSC calculations
4) Setting the DATA_COMPRESS bit when DSC is enabled

With these changes (and the dependency below), DSC v1.2 should work over
DSI in command mode.

Note: Changes that add DSC v1.2 support for video mode will be posted
with the DP support changes.

Depends-on:
 - "add DSC 1.2 dpu supports" [1]
 - "Introduce MSM-specific DSC helpers" [2]
 - "drm/msm/dsi: use mult_frac for pclk_bpp calculation" [3]

[1] https://patchwork.freedesktop.org/series/116789/
[2] https://patchwork.freedesktop.org/series/115833/
[3] https://patchwork.freedesktop.org/patch/538273/?series=118072&rev=1

Signed-off-by: Jessica Zhang <quic_jesszhan@xxxxxxxxxxx>
---
Changes in v6:
- "Adjust" --> "Reduce" in pclk patch title (Marijn)
- dsi_adjust_compressed_pclk() --> dsi_adjust_pclk_for_compression()
  (Marijn)
- Moved dsi_adjust_pclk_for_compression() to before is_bonded_dsi pclk
  adjustment (Dmitry)
- Added documentation comments explaining the pclk_rate and hdisplay
  adjustments related to DSC (Dmitry)
- Only set DATA_COMPRESS bit if DSC is enabled (Abhinav)
- Rebased on top of latest msm-next-lumag branch
- Link to v5: https://lore.kernel.org/r/20230405-add-dsc-support-v5-0-028c10850491@xxxxxxxxxxx

Changes in v5:
- Added newline before enable_compression() function pointer definition
- Rebased on top of "drm/msm/dsi: use mult_frac for pclk_bpp calculation"
- Reworded commit messages for clarity
- Dropped mentions of "soft slice" in commit messages
- "slice_per_packet" -> "slice_per_pkt"
- Picked up reviewed-by tags
- Link to v4: https://lore.kernel.org/r/20230405-add-dsc-support-v4-0-15daf84f8dcb@xxxxxxxxxxx

Changes in v4:
- Clarified slice_per_pkt comment regarding pkt_per_line calculations
- Reworded commit message for "drm/msm/dsi: Remove incorrect references
  to slice_count"
- Wrapped INTF_SC7280_MASK macro definition in parentheses
- Fixed incorrect commit hash in "msm/drm/dsi: Round up DSC hdisplay
  calculation"
- Picked up Reviewed-by tag
- Link to v3: https://lore.kernel.org/r/20230405-add-dsc-support-v3-0-6e1d35a206b3@xxxxxxxxxxx

Changes in v3:
- Added fix to round up hdisplay DSC adjustment
- Fixed inconsistent whitespace in dpu_hw_intf_ops comment doc
- Moved placement of dpu_hw_intf_enable_compression
- Picked up "drm/msm/dsi: Fix calculation for pkt_per_line" patch and
  squashed all slice_count fixes into a single patch
- Use drm_mode_vrefresh() to calculate adjusted pclk rate
- Moved compressed pclk adjustment to dsi_adjust_compressed_pclk() helper
- Rebased changes on top of updated dependencies
- Reworded commit message for "drm/msm/dpu: Set DATA_COMPRESS for
  command mode" for clarity
- Removed revision changelog in commit messages
- Link to v2: https://lore.kernel.org/r/20230405-add-dsc-support-v2-0-1072c70e9786@xxxxxxxxxxx

Changes in v2:
- Changed has_data_compress dpu_cap to a DATA_COMPRESS INTF feature flag
- Changed pclk math to only divide hdisplay by compression ratio
- Reworded word count TODO comment
- Make DATA_COMPRESS an INTF flag
- Read INTF_CONFIG2 before writing to DATA_COMPRESS bit
- Fixed whitespace issue in macro definition
- Removed `inline` from dpu_hw_intf_enable_compression declaration
- Only set dpu_hw_intf_ops.data_compress if DATA_COMPRESS feature is set
- Reworded commit messages and cover letter for clarity
- Link to v1: https://lore.kernel.org/r/20230405-add-dsc-support-v1-0-6bc6f03ae735@xxxxxxxxxxx

---
Jessica Zhang (6):
      msm/drm/dsi: Round up DSC hdisplay calculation
      drm/msm/dsi: Reduce pclk rate for compression
      drm/msm/dpu: Add DPU_INTF_DATA_COMPRESS feature flag for DPU >= 7.0
      drm/msm/dpu: Set DATA_COMPRESS on command mode for DCE/DSC 1.2
      drm/msm/dsi: Remove incorrect references to slice_count
      drm/msm/dsi: Document DSC related pclk_rate and hdisplay calculations

 .../gpu/drm/msm/disp/dpu1/dpu_encoder_phys_cmd.c   |  3 ++
 drivers/gpu/drm/msm/disp/dpu1/dpu_hw_catalog.c     |  2 +-
 drivers/gpu/drm/msm/disp/dpu1/dpu_hw_catalog.h     |  2 +
 drivers/gpu/drm/msm/disp/dpu1/dpu_hw_intf.c        | 13 +++++
 drivers/gpu/drm/msm/disp/dpu1/dpu_hw_intf.h        |  3 ++
 drivers/gpu/drm/msm/dsi/dsi_host.c                 | 59 +++++++++++++++++-----
 6 files changed, 67 insertions(+), 15 deletions(-)
---
base-commit: 8dc20f06b90af85c083866df73dae69236183b62
change-id: 20230405-add-dsc-support-fe130ba49841

Best regards,
-- 
Jessica Zhang <quic_jesszhan@xxxxxxxxxxx>