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drm/atomic: Add connector atomic_check function, v2. 

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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44
drivers/gpu/drm/drm_atomic_helper.c
View File

@ -459,10 +459,20 @@ mode_fixup(struct drm_atomic_state *state)
*
* Check the state object to see if the requested state is physically possible.
* This does all the crtc and connector related computations for an atomic
* update and adds any additional connectors needed for full modesets and calls
* down into &drm_crtc_helper_funcs.mode_fixup and
* &drm_encoder_helper_funcs.mode_fixup or
* &drm_encoder_helper_funcs.atomic_check functions of the driver backend.
* update and adds any additional connectors needed for full modesets. It calls
* the various per-object callbacks in the follow order:
*
* 1. &drm_connector_helper_funcs.atomic_best_encoder for determining the new encoder.
* 2. &drm_connector_helper_funcs.atomic_check to validate the connector state.
* 3. If it's determined a modeset is needed then all connectors on the affected crtc
* crtc are added and &drm_connector_helper_funcs.atomic_check is run on them.
* 4. &drm_bridge_funcs.mode_fixup is called on all encoder bridges.
* 5. &drm_encoder_helper_funcs.atomic_check is called to validate any encoder state.
* This function is only called when the encoder will be part of a configured crtc,
* it must not be used for implementing connector property validation.
* If this function is NULL, &drm_atomic_encoder_helper_funcs.mode_fixup is called
* instead.
* 6. &drm_crtc_helper_funcs.mode_fixup is called last, to fix up the mode with crtc constraints.
*
* &drm_crtc_state.mode_changed is set when the input mode is changed.
* &drm_crtc_state.connectors_changed is set when a connector is added or
@ -492,6 +502,7 @@ drm_atomic_helper_check_modeset(struct drm_device *dev,
struct drm_connector *connector;
struct drm_connector_state *old_connector_state, *new_connector_state;
int i, ret;
unsigned connectors_mask = 0;
for_each_oldnew_crtc_in_state(state, crtc, old_crtc_state, new_crtc_state, i) {
bool has_connectors =
@ -538,6 +549,8 @@ drm_atomic_helper_check_modeset(struct drm_device *dev,
return ret;
for_each_oldnew_connector_in_state(state, connector, old_connector_state, new_connector_state, i) {
const struct drm_connector_helper_funcs *funcs = connector->helper_private;
/*
* This only sets crtc->connectors_changed for routing changes,
* drivers must set crtc->connectors_changed themselves when
@ -555,6 +568,13 @@ drm_atomic_helper_check_modeset(struct drm_device *dev,
new_connector_state->link_status)
new_crtc_state->connectors_changed = true;
}
if (funcs->atomic_check)
ret = funcs->atomic_check(connector, new_connector_state);
if (ret)
return ret;
connectors_mask += BIT(i);
}
/*
@ -581,6 +601,22 @@ drm_atomic_helper_check_modeset(struct drm_device *dev,
return ret;
}
/*
* Iterate over all connectors again, to make sure atomic_check()
* has been called on them when a modeset is forced.
*/
for_each_oldnew_connector_in_state(state, connector, old_connector_state, new_connector_state, i) {
const struct drm_connector_helper_funcs *funcs = connector->helper_private;
if (connectors_mask & BIT(i))
continue;
if (funcs->atomic_check)
ret = funcs->atomic_check(connector, new_connector_state);
if (ret)
return ret;
}
return mode_fixup(state);
}
EXPORT_SYMBOL(drm_atomic_helper_check_modeset);

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);
};
/**