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 v9: - Fixed incorrect math for msm_dsc_get_bytes_per_line() - Link to v8: https://lore.kernel.org/r/20230329-rfc-msm-dsc-helper-v8-0-2c9b2bb1209c@xxxxxxxxxxx Changes in v8: - *_bytes_per_soft_slice --> *_bytes_per_slice - Fixed comment doc formatting for MSM DSC helpers - Use slice_chunk_size in msm_dsc_get_bytes_per_line calculation - Reworded "drm/msm/dpu: Use DRM DSC helper for det_thresh_flatness" commit title for clarity - Picked up "Reviewed-by" tags - Added duplicate Signed-off-by tag to "drm/display/dsc: Add flatness and initial scale value calculations" to reflect patch history - Link to v7: https://lore.kernel.org/r/20230329-rfc-msm-dsc-helper-v7-0-df48a2c54421@xxxxxxxxxxx Changes in v7: - Renamed msm_dsc_get_pclk_per_intf to msm_dsc_get_bytes_per_line - Removed duplicate msm_dsc_get_dce_bytes_per_line - Reworded commit message for "drm/msm/dpu: Use DRM DSC helper for det_thresh_flatness" - Dropped slice_per_pkt change (it will be included in the later "Add DSC v1.2 Support for DSI" series) - Picked up "drm/display/dsc: Add flatness and initial scale value calculations" and "drm/display/dsc: add helper to set semi-const parameters", which were dropped from "drm/i915: move DSC RC tables to drm_dsc_helper.c" series - Picked up "Reviewed-by" tags - Removed changelog in individual patches - Link to v6: https://lore.kernel.org/r/20230329-rfc-msm-dsc-helper-v6-0-cb7f59f0f7fb@xxxxxxxxxxx Changes in v6: - Documented return values for MSM DSC helpers - Fixed dependency issue in msm_dsc_helper.c - Link to v5: https://lore.kernel.org/r/20230329-rfc-msm-dsc-helper-v5-0-0108401d7886@xxxxxxxxxxx Changes in v5: - Added extra line at end of msm_dsc_helper.h - Simplified msm_dsc_get_bytes_per_soft_slice() math - Simplified and inlined msm_dsc_get_pclk_per_intf() math - "Fix calculations pkt_per_line" --> "... Fix calculation for pkt_per_line" - Split dsc->slice_width check into a separate patch - Picked up Dmitry's msm/dsi patch ("drm/msm/dsi: use new helpers for DSC setup") - Removed unused headers in MSM DSC helper files - Picked up Reviewed-by tags - Link to v4: https://lore.kernel.org/r/20230329-rfc-msm-dsc-helper-v4-0-1b79c78b30d7@xxxxxxxxxxx Changes in v4: - Changed msm_dsc_get_uncompressed_pclk_per_intf to msm_dsc_get_pclk_per_intf - Moved pclk_per_intf calculation for dsi_timing_setup to `if (msm_host->dsc)` block - Link to v3: https://lore.kernel.org/r/20230329-rfc-msm-dsc-helper-v3-0-6bec0d277a83@xxxxxxxxxxx Changes in v3: - Dropped src_bpp parameter from all methods -- src_bpp can be calculated as dsc->bits_per_component * 3- Cleaned up unused parameters - Dropped intf_width parameter from get_bytes_per_soft_slice() - Moved dsc->bits_per_component to numerator calculation in get_bytes_per_soft_slice() - Made get_bytes_per_soft_slice() a public method (this will be called later to help calculate DP pclk params)- Added comment documentation to MSM DSC helpers - Renamed msm_dsc_get_uncompressed_pclk_per_line to *_get_uncompressed_pclk_per_intf() - Removed dsc->slice_width check from msm_dsc_get_uncompressed_pclk_per_intf() - Added documentation in comments - Moved extra_eol_bytes math out of msm_dsc_get_eol_byte_num() - Renamed msm_dsc_get_eol_byte_num to *_get_bytes_per_intf. - Reworded slice_last_group_size calculation to `(dsc->slice_width + 2) % 3` - Used MSM DSC helper to calculate total_bytes_per_intf - Initialized hdisplay as uncompressed pclk per line at the beginning of dsi_timing_setup as to not break dual DSI calculations - Added slice_width check to dsi_timing_setup - Dropped 78c8b81d57d8 ("drm/display/dsc: Add flatness and initial scale value calculations") patch as it was absorbed in Dmitry's DSC series [1] - Split dsi_timing_setup() hdisplay calculation to a separate patch - Link to v2: https://lore.kernel.org/r/20230329-rfc-msm-dsc-helper-v2-0-3c13ced536b2@xxxxxxxxxxx Changes in v2: - Changed det_thresh_flatness to flatness_det_thresh - Set initial_scale_value directly in helper - Moved msm_dsc_helper files to msm/ directory - Dropped get_comp_ratio() helper - Used drm_int2fixp() to convert to integers to fp - Fixed type mismatch issues in MSM DSC helpers - Changed DSC_BPP macro to drm_dsc_get_bpp_int() helper method - Style changes to improve readability - Dropped last division step of msm_dsc_get_pclk_per_line() and changed method name accordingly - Dropped unused bpp variable in msm_dsc_get_dce_bytes_per_line() - Changed msm_dsc_get_slice_per_intf() to a static inline method - 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() - *_calculate_initial_scale_value --> *_set_initial_scale_value - Picked up Fixes tags for patches 3/5 and 4/5 - Picked up Reviewed-by for patch 4/5 - Link to v1: https://lore.kernel.org/r/20230329-rfc-msm-dsc-helper-v1-0-f3e479f59b6d@xxxxxxxxxxx --- Dmitry Baryshkov (2): drm/display/dsc: add helper to set semi-const parameters drm/msm/dsi: use DRM DSC helpers for DSC setup 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 fixed 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 drivers/gpu/drm/display/drm_dsc_helper.c | 22 ++++++++++ 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 | 70 ++++++------------------------ drivers/gpu/drm/msm/msm_dsc_helper.c | 26 +++++++++++ drivers/gpu/drm/msm/msm_dsc_helper.h | 69 +++++++++++++++++++++++++++++ include/drm/display/drm_dsc_helper.h | 12 +++++ 7 files changed, 149 insertions(+), 60 deletions(-) --- base-commit: 5526fe03b40ca1cc72c7b4e97f28d3bbfaa0ded9 change-id: 20230329-rfc-msm-dsc-helper-981a95edfbd0 Best regards, -- Jessica Zhang <quic_jesszhan@xxxxxxxxxxx>
