SYNOPSIS
- struct drm_atomic_state * drm_atomic_helper_duplicate_state(struct drm_device * dev, struct drm_modeset_acquire_ctx * ctx);
ARGUMENTS
dev
-
- DRM device
ctx
- lock acquisition context
DESCRIPTION
Makes a copy of the current atomic state by looping over all objects and duplicating their respective states. This is used for example by suspend/ resume support code to save the state prior to suspend such that it can be restored upon resume.
Note that this treats atomic state as persistent between save and restore. Drivers must make sure that this is possible and won't result in confusion or erroneous behaviour.
Note that if callers haven't already acquired all modeset locks this might return -EDEADLK, which must be handled by calling drm_modeset_backoff.
RETURNS
A pointer to the copy of the atomic state object on success or an ERR_PTR-encoded error code on failure.
AUTHORS
Jesse Barnes <[email protected]>
Intel Corporation,
- Initial version
Laurent Pinchart <[email protected]>
Ideas on board SPRL,
- Driver internals
Daniel Vetter <[email protected]>
Intel Corporation,
- Contributions all over the place
Lukas Wunner <[email protected]>
- vga_switcheroo documentation
COPYRIGHT