Flattening a scene in order to reduce memory consumption it's an idea
which had been floating around on irc and mailing list several times,
this patchset adds support for flattening a scene using a writeback
connector, the latest version of the kernel patches could be found
here [1].
v1 for this patch series could be found here [2].
Changes since v1:
- Add support to use either the same crtc or a dedicated one, this
had been discussed on irc here [3].
- Add support for parsing more than one drm node, this is triggered
by the fact the on Mali DP each device has it's own driver, so
it's needed in order to use a dedicate crtc for flattening.
- Parse encoder possible_clones to detect if writeback could
function simultaneously with the display connector.
- Fixes for some bugs discovered while working on this.
- Split changes in multiple patches.
The patches could be classified in:
[1-3]: Bug fixes that could be independently merged
drm_hwcomposer: vsyncworker: Fix uninitialized enabled_ field
drm_hwcomposer: vsyncworker: Fix deadlock on exit path
drm_hwcomposer: drmeventlistener: Set nl_pid to 0
[4-5]: Support for multiple drm devices:
drm_hwcomposer: Add resource manager class
drm_hwcomposer: Enable resource manager support
[6-18]: Scene flattening support
drm_hwcomposer: Add writeback connector support
drm_hwcomposer: Add display field to Drmencoder
drm_hwcomposer: Parse and store possible_clones information
drm_hwcomposer: Handle writeback connectors
drm_hwcomposer: hwcutils: Add function for cloning a DrmHwcLayer
drm_hwcomposer: Add utility functions to copy displaycomposition
internals
drm_hwcomposer: Add utility function to create an initialized
composition
drm_hwcomposer: Pass buffer sizes to Prepareframebuffer
drm_hwcomposer: Fix race in ApplyFrame
drm_hwcomposer: Add worker to trigger scene flattenning
drm_hwcomposer: Find writeback connector for scene flattening
drm_hwcomposer: Flatten scene synchronously
drm_hwcomposer: Flatten scene asynchronously
Tested both code paths on Mali DP with some hacks that disable
the GLCompositor.
[1] https://lists.freedesktop.org/archives/dri-devel/2018-February/167703.html
[2] https://www.spinics.net/lists/dri-devel/msg169046.html
[3] https://people.freedesktop.org/~cbrill/dri-log/?channel=dri-devel&date=2018-03-21
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