This series adds support for writeback block on DPU. Writeback block is extremely useful to validate boards having no physical displays in addition to many other use-cases where we want to get the output of the display pipeline to examine whether issue is with the display pipeline or with the panel.
These changes have been validated on SM8250 RB5 boards with IGT KMS writeback test-suite thereby further increasing the IGT test coverage for DPU. I am sharing the test results below.
root@linaro-developer:~/igt_repo/igt-gpu-tools/build/tests# ./kms_writeback [ 35.066157] Console: switching to colour dummy device 80x25 [ 35.071964] [IGT] kms_writeback: executing IGT-Version: 1.26-gae2eb9e1 (aarch64) (Linux: 5.16.0-rc2-62171-g132577e2697b aarch64) [ 35.611418] [IGT] kms_writeback: starting subtest writeback-pixel-formats Starting subtest: writeback-pixel-formats [ 35.618528] [IGT] kms_writeback: starting subtest writeback-invalid-parameters Subtest writeback-pixel-formats: SUCCESS (0.000s) Starting subtest: writeback-invalid-parameters Subtest writeback-invalid-parameters: SUCCESS (0.028s) 35.657437] [IGT] kms_writeback: starting subtest writeback-fb-id Starting subtest: writeback-fb-id Subtest writeback-fb-id: SUCCESS (0.030s) [ 35.698957] [IGT] kms_writeback: starting subtest writeback-check-output Starting subtest: writeback-check-output [ 35.852834] [IGT] kms_writeback: exiting, ret=0 Subtest writeback-check-output: SUCCESS (0.142s) [ 35.861291] Console: switching to colour frame buffer device 240x67 root@linaro-developer:~/igt_repo/igt-gpu-tools/build/tests#
The changes can easily be extended to support any other chipset using the DPU driver by adding the support in the catalog.
Writeback block supports various formats and features. The support for all of them can be incrementally added on top of this framework when validation is improved and the test frameworks are extended to validate them.
Abhinav Kumar (12): drm/msm/dpu: add writeback blocks to the sm8250 DPU catalog drm/msm/dpu: add dpu_hw_wb abstraction for writeback blocks drm/msm/dpu: add writeback blocks to DPU RM drm/msm/dpu: add changes to support writeback in hw_ctl drm/msm/dpu: add an API to reset the encoder related hw blocks drm/msm/dpu: make changes to dpu_encoder to support virtual encoder drm/msm/dpu: add encoder operations to prepare/cleanup wb job drm/msm/dpu: introduce the dpu_encoder_phys_* for writeback drm/msm/dpu: add the writeback connector layer drm/msm/dpu: initialize dpu encoder and connector for writeback drm/msm/dpu: gracefully handle null fb commits for writeback drm/msm/dpu: add writeback blocks to the display snapshot
drivers/gpu/drm/msm/Makefile | 3 + drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.c | 9 + drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c | 241 +++++- drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.h | 25 + drivers/gpu/drm/msm/disp/dpu1/dpu_encoder_phys.h | 50 ++ .../gpu/drm/msm/disp/dpu1/dpu_encoder_phys_cmd.c | 3 +- .../gpu/drm/msm/disp/dpu1/dpu_encoder_phys_vid.c | 6 +- .../gpu/drm/msm/disp/dpu1/dpu_encoder_phys_wb.c | 825 +++++++++++++++++++++ drivers/gpu/drm/msm/disp/dpu1/dpu_hw_catalog.c | 73 +- drivers/gpu/drm/msm/disp/dpu1/dpu_hw_catalog.h | 66 +- drivers/gpu/drm/msm/disp/dpu1/dpu_hw_ctl.c | 65 +- drivers/gpu/drm/msm/disp/dpu1/dpu_hw_ctl.h | 27 +- drivers/gpu/drm/msm/disp/dpu1/dpu_hw_wb.c | 267 +++++++ drivers/gpu/drm/msm/disp/dpu1/dpu_hw_wb.h | 145 ++++ drivers/gpu/drm/msm/disp/dpu1/dpu_kms.c | 67 ++ drivers/gpu/drm/msm/disp/dpu1/dpu_kms.h | 2 + drivers/gpu/drm/msm/disp/dpu1/dpu_rm.c | 71 ++ drivers/gpu/drm/msm/disp/dpu1/dpu_rm.h | 2 + drivers/gpu/drm/msm/disp/dpu1/dpu_writeback.c | 71 ++ drivers/gpu/drm/msm/disp/dpu1/dpu_writeback.h | 27 + 20 files changed, 2007 insertions(+), 38 deletions(-) create mode 100644 drivers/gpu/drm/msm/disp/dpu1/dpu_encoder_phys_wb.c create mode 100644 drivers/gpu/drm/msm/disp/dpu1/dpu_hw_wb.c create mode 100644 drivers/gpu/drm/msm/disp/dpu1/dpu_hw_wb.h create mode 100644 drivers/gpu/drm/msm/disp/dpu1/dpu_writeback.c create mode 100644 drivers/gpu/drm/msm/disp/dpu1/dpu_writeback.h