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gpu: host1x: Provide a proper struct bus_type

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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>
This commit is contained in:
Thierry Reding 2014-12-18 15:29:14 +01:00
parent 99d2cd81d7
commit f4c5cf88fb
6 changed files with 107 additions and 49 deletions
Download patch file Download diff file Expand all files Collapse all files

6
drivers/gpu/host1x/dev.c
View file

@ -216,7 +216,7 @@ static int __init tegra_host1x_init(void)
{
int err;
err = host1x_bus_init();
err = bus_register(&host1x_bus_type);
if (err < 0)
return err;
@ -233,7 +233,7 @@ static int __init tegra_host1x_init(void)
unregister_host1x:
platform_driver_unregister(&tegra_host1x_driver);
unregister_bus:
host1x_bus_exit();
bus_unregister(&host1x_bus_type);
return err;
}
module_init(tegra_host1x_init);
@ -242,7 +242,7 @@ static void __exit tegra_host1x_exit(void)
{
platform_driver_unregister(&tegra_mipi_driver);
platform_driver_unregister(&tegra_host1x_driver);
host1x_bus_exit();
bus_unregister(&host1x_bus_type);
}
module_exit(tegra_host1x_exit);