Writeback split is also for workaround the size limitation of d71 scaler.
Like layer_split, writeback downscaling also can use two scalers to handle
the scaling half-by-half. The only differnence is writback needs a
standalone component (splitter)'s help to split the composition result.
The data pipeline of writeback split as below:
/-> scaler-0 ->\
compiz -> splitter merger -> wb_layer -> memory
\-> scaler-1 ->/
Depends on:
- https://patchwork.freedesktop.org/series/58710/
- https://patchwork.freedesktop.org/series/59000/
- https://patchwork.freedesktop.org/series/59002/
- https://patchwork.freedesktop.org/series/59747/
- https://patchwork.freedesktop.org/series/59915/
- https://patchwork.freedesktop.org/series/60083/
- https://patchwork.freedesktop.org/series/60698/
- https://patchwork.freedesktop.org/series/60856/
- https://patchwork.freedesktop.org/series/60893/
- https://patchwork.freedesktop.org/series/61370/
James Qian Wang (Arm Technology China) (2):
drm/komeda: Add new component komeda_splitter
drm/komeda: Enable writeback split support
.../arm/display/komeda/d71/d71_component.c | 63 ++++++++++
.../drm/arm/display/komeda/komeda_pipeline.c | 3 +
.../drm/arm/display/komeda/komeda_pipeline.h | 23 +++-
.../display/komeda/komeda_pipeline_state.c | 117 ++++++++++++++++--
.../arm/display/komeda/komeda_private_obj.c | 50 ++++++++
.../arm/display/komeda/komeda_wb_connector.c | 17 ++-
6 files changed, 257 insertions(+), 16 deletions(-)
--
2.17.1
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