SYNOPSIS

int drm_atomic_helper_check(struct drm_device * dev, struct drm_atomic_state * state);

ARGUMENTS

dev

DRM device

state

the driver state object

DESCRIPTION

Check the state object to see if the requested state is physically possible. Only crtcs and planes have check callbacks, so for any additional (global) checking that a driver needs it can simply wrap that around this function. Drivers without such needs can directly use this as their ->atomic_check callback.

This just wraps the two parts of the state checking for planes and modeset

STATE IN THE DEFAULT ORDER

First it calls drm_atomic_helper_check_modeset and then drm_atomic_helper_check_planes. The assumption is that the ->atomic_check functions depend upon an updated adjusted_mode.clock to e.g. properly compute watermarks.

RETURNS Zero for success or -errno

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

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