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# DRM lease support layer
This yocto layer adds support for using DRM leases to partition display
controller output resources between multiple processes.
This layer adds a drm-lease-manager deamon (with systemd configuration)
and a client library for receiving DRM leases from the daemon. For more details
the DRM lease manager and client see the repository at
(https://gerrit.automotivelinux.org/gerrit/gitweb?p=src/drm-lease-manager.git)
## Setup
Enable the `agl-drm-lease` AGL feature when setting up your build environment
with aglsetup.sh.
This will add the `drm-lease-manager` package to the image, and will add DRM
lease support to the following packages:
* weston
* kmscube
`kmscube` is not included in the image by default. To add the package to the
image, add the following to your local.conf
```
IMAGE_INSTALL:append = " kmscube"
```
## Starting the DRM lease manager
The drm-lease-manager must be the only process to directly open the DRM device.
Shut down any running window systems (eg. weston or agl-compositor) and run:
```
# systemctl start drm-lease-manager
```
This will create 1 lease for each output connection on the platform.
The name of each lease will be in the form of `card0-<output name>`
(eg. `card0-LVDS-1` or `card0-HDMI-A-1`)
## Running weston
weston can be started on any available DRM lease by running with the
`--drm-lease=<lease name>` option. Eg:
```
# weston --drm-lease=card0-HDMI-A-1
```
## Running kmscube sample
With the `drm-lease-manager` running `kmscube` can display on any available
lease by running with the `-L -D<lease name>` options. Eg:
```
# kmscube -L -Dcard0-HDMI-A-1
```
Multiple kmscube instances (one per DRM lease) can be started at the same time.
## Tested targets
This layer has been tested on the Renesas R-Car Gen3 platform. Other platforms
supporting the Linux DRM API may work as well.
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