Improve kerneldoc for the public parts of the host1x infrastructure in
preparation for adding driver-specific part to the GPU documentation.
Acked-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Signed-off-by: Thierry Reding <treding@nvidia.com>
Shutting down a host1x device currently crashes if the device has failed
to probe. The root cause is that the host1x shutdown is implemented as a
struct bus_type callback, but in turn relies on the driver bound to the
device. On failure to probe, no driver will be bound and cause the code
to crash.
Fix this by moving the ->probe(), ->remove() and ->shutdown() callbacks
to the driver rather than the bus.
Signed-off-by: Thierry Reding <treding@nvidia.com>
Only two cleanups this time around. One fixes reference counting of
device tree nodes, the other changes the return value of a function
from an unsigned int to an int to reflect that it will return error
codes.
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Merge tag 'drm/tegra/for-4.6-rc1' of http://anongit.freedesktop.org/git/tegra/linux into drm-next
drm/tegra: Changes for v4.6-rc1
Only two cleanups this time around. One fixes reference counting of
device tree nodes, the other changes the return value of a function
from an unsigned int to an int to reflect that it will return error
codes.
* tag 'drm/tegra/for-4.6-rc1' of http://anongit.freedesktop.org/git/tegra/linux:
gpu: host1x: Use a signed return type for do_relocs()
gpu: host1x: bus: Add missing of_node_put()
for_each_child_of_node() performs an of_node_get() on each iteration, so
to break out of the loop an of_node_put() is required.
Found using Coccinelle. The semantic patch used for this is as follows:
// <smpl>
@@
expression e;
local idexpression n;
@@
for_each_child_of_node(..., n) {
... when != of_node_put(n)
when != e = n
(
return n;
|
+ of_node_put(n);
? return ...;
)
...
}
// </smpl>
Signed-off-by: Amitoj Kaur Chawla <amitoj1606@gmail.com>
Signed-off-by: Thierry Reding <treding@nvidia.com>
Currently host1x-instanciated devices have their dma_ops left to NULL,
which makes any DMA operation (like buffer import) on ARM64 fallback
to the dummy_dma_ops and fail with an error.
This patch calls of_dma_configure() with the host1x node when creating
such a device, so the proper DMA operations are set.
Suggested-by: Thierry Reding <thierry.reding@gmail.com>
Signed-off-by: Alexandre Courbot <acourbot@nvidia.com>
Signed-off-by: Thierry Reding <treding@nvidia.com>
When unregistering a host1x driver, make sure to unregister the core
driver as well to prevent it from sticking around and oppose reloading
of the driver.
Signed-off-by: Thierry Reding <treding@nvidia.com>
Previously the struct bus_type exported by the host1x infrastructure was
only a very basic skeleton. Turn that implementation into a more full-
fledged bus to support proper probe ordering and power management.
Note that the bus infrastructure needs to be available before any of the
drivers can be registered. This is automatically ensured if all drivers
are built as loadable modules (via symbol dependencies). If all drivers
are built-in there are no such guarantees and the link order determines
the initcall ordering. Adjust drivers/gpu/Makefile to make sure that the
host1x bus infrastructure is initialized prior to any of its users (only
drm/tegra currently).
v2: Fix building host1x and tegra-drm as modules
Reported-by: Dave Airlie <airlied@gmail.com>
Reviewed-by: Sean Paul <seanpaul@chromium.org>
Reviewed-by: Mark Zhang <markz@nvidia.com>
Signed-off-by: Thierry Reding <treding@nvidia.com>
Instead of locking within host1x_device_add(), call it under the lock to
make the locking more consistent.
Signed-off-by: Thierry Reding <treding@nvidia.com>
When a driver's ->probe() function fails, the host1x bus must not call
its ->remove() function because the driver will already have cleaned up
in the error handling path in ->probe().
Signed-off-by: Thierry Reding <treding@nvidia.com>
The internal host1x_{,un}register_client() functions can potentially be
confused with public the host1x_client_{,un}register() functions.
Rename them to host1x_{add,del}_client() to remove some of the possible
confusion.
Signed-off-by: Thierry Reding <treding@nvidia.com>
Include the bus.h header, so that various function declarations are
visible in the source file that implements those functions. This keeps
sparse from suggesting that they should be made static.
Make the host1x_bus_type variable static since it isn't used globally.
Finally replace the slightly unsafe dev_set_name(dev, name) by the more
secure dev_set_name(dev, "%s", name).
Signed-off-by: Thierry Reding <treding@nvidia.com>
The Tegra DRM driver currently uses some infrastructure to defer the DRM
core initialization until all required devices have registered. The same
infrastructure can potentially be used by any other driver that requires
more than a single sub-device of the host1x module.
Make the infrastructure more generic and keep only the DRM specific code
in the DRM part of the driver. Eventually this will make it easy to move
the DRM driver part back to the DRM subsystem.
Signed-off-by: Thierry Reding <treding@nvidia.com>
