drm/komeda: Enable writeback split support

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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 ->/

v2: Rebase

Signed-off-by: James Qian Wang (Arm Technology China) <james.qian.wang@arm.com>
Signed-off-by: Liviu Dudau <Liviu.Dudau@arm.com>

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james qian wang (Arm Technology China) 2019-06-12 11:20:18 +01:00 • committed by Liviu Dudau

parent 4b9baf74ef

commit 264b9436d2

3 changed files with 124 additions and 14 deletions

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4

drivers/gpu/drm/arm/display/komeda/komeda_pipeline.h

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117

drivers/gpu/drm/arm/display/komeda/komeda_pipeline_state.c

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17

drivers/gpu/drm/arm/display/komeda/komeda_wb_connector.c

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