drm_hwcomposer: Add out-fence support
Add support for out-fences through the OUT_FENCE_PTR property.
Out-fences signal when their associated buffer may be read by a device.
Signed-off-by: Robert Foss <robert.foss@collabora.com>
Reviewed-by: Sean Paul <seanpaul@chromium.org>
diff --git a/drmdisplaycompositor.cpp b/drmdisplaycompositor.cpp
index 75c1a7c..8936d08 100644
--- a/drmdisplaycompositor.cpp
+++ b/drmdisplaycompositor.cpp
@@ -602,6 +602,7 @@
display_comp->composition_planes();
std::vector<DrmCompositionRegion> &pre_comp_regions =
display_comp->pre_comp_regions();
+ uint64_t out_fences[drm_->crtcs().size()];
DrmConnector *connector = drm_->GetConnectorForDisplay(display_);
if (!connector) {
@@ -620,6 +621,16 @@
return -ENOMEM;
}
+ if (crtc->out_fence_ptr_property().id() != 0) {
+ ret = drmModeAtomicAddProperty(pset, crtc->id(), crtc->out_fence_ptr_property().id(),
+ (uint64_t) &out_fences[crtc->pipe()]);
+ if (ret < 0) {
+ ALOGE("Failed to add OUT_FENCE_PTR property to pset: %d", ret);
+ drmModeAtomicFree(pset);
+ return ret;
+ }
+ }
+
if (mode_.needs_modeset) {
ret = drmModeAtomicAddProperty(pset, crtc->id(), crtc->mode_property().id(),
mode_.blob_id) < 0 ||
@@ -818,6 +829,10 @@
mode_.needs_modeset = false;
}
+ if (crtc->out_fence_ptr_property().id()) {
+ display_comp->set_out_fence((int) out_fences[crtc->pipe()]);
+ }
+
return ret;
}