kernel/linux.git/drivers/gpu/host1x/bus.c, branch v5.15.72

gpu: host1x: Split up client initalization and registration

2021-05-17T10:31:05+00:00

In some cases we may need to initialize the host1x client first before registering it. This commit adds a new helper that will do nothing but the initialization of the data structure. At the same time, the initialization is removed from the registration function. Note, however, that for simplicity we explicitly initialize the client when the host1x_client_register() function is called, as opposed to the low-level __host1x_client_register() function. This allows existing callers to remain unchanged. Signed-off-by: Thierry Reding

gpu: host1x: Add early init and late exit callbacks

2021-03-31T15:42:14+00:00

These callbacks can be used by client drivers to run code during early init and during late exit. Early init callbacks are run prior to the regular init callbacks while late exit callbacks run after the regular exit callbacks. Signed-off-by: Thierry Reding

gpu: host1x: Use different lock classes for each client

2021-03-30T17:37:20+00:00

To avoid false lockdep warnings, give each client lock a different lock class, passed from the initialization site by macro. Signed-off-by: Mikko Perttunen Signed-off-by: Thierry Reding

gpu/host1x: bus: Add missing description for 'driver'

2020-11-05T21:12:55+00:00

Fixes the following W=1 kernel build warning(s): drivers/gpu/host1x/bus.c:40: warning: Function parameter or member 'driver' not described in 'host1x_subdev_add' Cc: Thierry Reding Cc: dri-devel@lists.freedesktop.org Cc: linux-tegra@vger.kernel.org Signed-off-by: Lee Jones Acked-by: Thierry Reding Signed-off-by: Sam Ravnborg Link: https://patchwork.freedesktop.org/patch/msgid/20201105144517.1826692-2-lee.jones@linaro.org

gpu: host1x: Detach driver on unregister

2020-06-16T16:59:46+00:00

Currently when a host1x device driver is unregistered, it is not detached from the host1x controller, which means that the device will stay around and when the driver is registered again, it may bind to the old, stale device rather than the new one that was created from scratch upon driver registration. This in turn can cause various weird crashes within the driver core because it is confronted with a device that was already deleted. Fix this by detaching the driver from the host1x controller when it is unregistered. This ensures that the deleted device also is no longer present in the device list that drivers will bind to. Reported-by: Sowjanya Komatineni Signed-off-by: Thierry Reding Tested-by: Sowjanya Komatineni Signed-off-by: Thierry Reding

drm/tegra: Do not implement runtime PM

2020-01-10T15:37:43+00:00

The Tegra DRM driver heavily relies on the implementations for runtime suspend/resume to be called at specific times. Unfortunately, there are some cases where that doesn't work. One example is if the user disables runtime PM for a given subdevice. Another example is that the PM core acquires a reference to runtime PM during system sleep, effectively preventing devices from going into low power modes. This is intentional to avoid nasty race conditions, but it also causes system sleep to not function properly on all Tegra systems. Fix this by not implementing runtime PM at all. Instead, a minimal, reference-counted suspend/resume infrastructure is added to the host1x bus. This has the benefit that it can be used regardless of the system power state (or any transitions we might be in), or whether or not the user allows runtime PM. Atomic modesetting guarantees that these functions will end up being called at the right point in time, so the pitfalls for the more generic runtime PM do not apply here. Signed-off-by: Thierry Reding

gpu: host1x: Rename "parent" to "host"

2020-01-10T15:37:38+00:00

Rename the host1x clients' parent to "host" because that more closely describes what it is. The parent can be confused with the parent device in terms of the device hierarchy. Subsequent patches will add a new member that refers to the parent in that hierarchy. Signed-off-by: Thierry Reding

gpu: host1x: Do not limit DMA segment size

2019-10-28T10:18:08+00:00

host1x nor any its clients have any limitations on the DMA segment size, so don't pretend that they do. Signed-off-by: Thierry Reding

Merge tag 'drm/tegra/for-5.3-rc1' of git://anongit.freedesktop.org/tegra/linux into drm-next

2019-06-25T02:59:43+00:00

drm/tegra: Changes for v5.3-rc1 This contains a couple of small improvements and cleanups for the Tegra DRM driver. Signed-off-by: Dave Airlie From: Thierry Reding Link: https://patchwork.freedesktop.org/patch/msgid/20190621150753.19550-1-thierry.reding@gmail.com

gpu: host1x: Do not link logical devices to DT nodes

2019-06-05T13:06:03+00:00

Logical devices created by the host1x bus infrastructure don't need to be associated with a device tree node. Doing so will cause the driver core to attempt to hook up IOMMU operations and fail because it is not a real device. However, for backwards-compatibility, we need to provide various OF_* uevent variables that were previously provided by of_device_uevent() and which are parsed by libdrm in userspace when querying the available devices. Do this by implementing a uevent callback for the host1x bus. Signed-off-by: Thierry Reding