On Fri, Mar 02, 2018 at 01:31:22PM +0000, Emil Velikov wrote: > On 2 March 2018 at 11:29, Thierry Reding <thierry.red...@gmail.com> wrote: > > From: Thierry Reding <tred...@nvidia.com> > > > > ARM SoCs usually have their DRM/KMS devices on the platform bus, so add > > support for this bus in order to allow use of the DRI_PRIME environment > > variable with those devices. > > > > While at it, also support the host1x bus, which is effectively the same > > but uses an additional layer in the bus hierarchy. > > > > Note that it isn't enough to support the bus that has the rendering GPU > > because the loader code will also try to construct an ID path tag for a > > scanout-only device if it is the default that is being opened. > > > > The ID path tag for a device can be obtained by running udevadm info on > > the device node, as shown in this example on NVIDIA Tegra: > > > > $ udevadm info /dev/dri/card0 | grep ID_PATH_TAG > > E: ID_PATH_TAG=platform-50000000_host1x > > > > The corresponding OF_FULLNAME property, from which the ID_PATH_TAG is > > constructed, can be found in the sysfs "uevent" attribute for the card0 > > device's parent: > > > > $ grep OF_FULLNAME /sys/devices/platform/50000000.host1x/drm/uevent > > OF_FULLNAME=/host1x@50000000 > > > > Similarily, /dev/dri/card1 corresponds to the GPU: > > > > $ udevadm info /dev/dri/card1 | grep ID_PATH_TAG > > E: ID_PATH_TAG=platform-57000000_gpu > > > > and: > > > > $ grep OF_FULLNAME /sys/devices/platform/57000000.gpu/uevent > > OF_FULLNAME=/gpu@57000000 > > > > Changes in v2: > > - avoid confusing pre-increment in strdup() > > - add examples of tags to commit log > > > > Reviewed-by: Eric Engestrom <e...@engestrom.ch> > > Signed-off-by: Thierry Reding <tred...@nvidia.com> > Smashing, thanks for the examples Thierry. > > Reviewed-by: Emil Velikov <emil.veli...@collabora.com>
Thanks! Pushed to master. Thierry
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