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drm/atomic: Add connector atomic_check function, v2.

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The atomic_check function is useful for implementing properties, but
it can be used for other connector modeset related checks as well.

Similar to plane check functions, on a modeset atomic_check() is always
called.

Changes since v1:
- Make sure atomic_check() is called on any modeset.

Signed-off-by: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
Reviewed-by: Dhinakaran Pandiyan <dhinakaran.pandiyan@intel.com>
Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Signed-off-by: Sean Paul <seanpaul@chromium.org>
Link: http://patchwork.freedesktop.org/patch/msgid/1491477543-31257-5-git-send-email-maarten.lankhorst@linux.intel.com
This commit is contained in:
Maarten Lankhorst
2017-04-06 13:19:03 +02:00
committed by Sean Paul
parent 970ece83fd
commit ce09d7667d
2 changed files with 74 additions and 4 deletions
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34
include/drm/drm_modeset_helper_vtables.h
View File

@@ -872,6 +872,40 @@ struct drm_connector_helper_funcs {
*/
struct drm_encoder *(*atomic_best_encoder)(struct drm_connector *connector,
struct drm_connector_state *connector_state);
/**
* @atomic_check:
*
* This hook is used to validate connector state. This function is
* called from &drm_atomic_helper_check_modeset, and is called when
* a connector property is set, or a modeset on the crtc is forced.
*
* Because &drm_atomic_helper_check_modeset may be called multiple times,
* this function should handle being called multiple times as well.
*
* This function is also allowed to inspect any other object's state and
* can add more state objects to the atomic commit if needed. Care must
* be taken though to ensure that state check and compute functions for
* these added states are all called, and derived state in other objects
* all updated. Again the recommendation is to just call check helpers
* until a maximal configuration is reached.
*
* NOTE:
*
* This function is called in the check phase of an atomic update. The
* driver is not allowed to change anything outside of the free-standing
* state objects passed-in or assembled in the overall &drm_atomic_state
* update tracking structure.
*
* RETURNS:
*
* 0 on success, -EINVAL if the state or the transition can't be
* supported, -ENOMEM on memory allocation failure and -EDEADLK if an
* attempt to obtain another state object ran into a &drm_modeset_lock
* deadlock.
*/
int (*atomic_check)(struct drm_connector *connector,
struct drm_connector_state *state);
};
/**