drm_hwcomposer: Handle writeback connectors
When writeback connectors are available assign them to displays, in
order to be able to use them for flattening of the current displayed
scene. The pipeline for each display will look like this:
CRTC ---- encoder ------------ display connector.
|------- writeback enc ------ writeback connector.
However, the writeback connector will be later used/enabled only if
one of the following conditions are met:
- Could be a clone of the display connector, as pointed by the
possible_clones property.
- The display_connector is disconnected, so we are safe to use it for
flattening the scene that's already presented on another display.
Signed-off-by: Alexandru Gheorghe <alexandru-cosmin.gheorghe@arm.com>
diff --git a/drmdevice.h b/drmdevice.h
index e086067..671cab6 100644
--- a/drmdevice.h
+++ b/drmdevice.h
@@ -57,6 +57,7 @@
}
DrmConnector *GetConnectorForDisplay(int display) const;
+ DrmConnector *GetWritebackConnectorForDisplay(int display) const;
DrmCrtc *GetCrtcForDisplay(int display) const;
DrmPlane *GetPlane(uint32_t id) const;
DrmEventListener *event_listener();
@@ -81,11 +82,13 @@
DrmProperty *property);
int CreateDisplayPipe(DrmConnector *connector);
+ int AttachWriteback(DrmConnector *display_conn);
UniqueFd fd_;
uint32_t mode_id_ = 0;
std::vector<std::unique_ptr<DrmConnector>> connectors_;
+ std::vector<std::unique_ptr<DrmConnector>> writeback_connectors_;
std::vector<std::unique_ptr<DrmEncoder>> encoders_;
std::vector<std::unique_ptr<DrmCrtc>> crtcs_;
std::vector<std::unique_ptr<DrmPlane>> planes_;