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drm/atomic-helper: Export both plane and modeset check helpers
The default call sequence for these two parts won't fit for all drivers. So export the two pieces and explain with a bit of kerneldoc when each should be called. v2: Squash in fixup from Rob to actually add the newly exported functions to headers Cc: Rob Clark <robdclark@gmail.com> Reviewed-by: Rob Clark <robdclark@gmail.com> Signed-off-by: Daniel Vetter <daniel.vetter@intel.com>
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@ -330,7 +330,29 @@ mode_fixup(struct drm_atomic_state *state)
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return 0;
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}
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static int
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/**
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* drm_atomic_helper_check - validate state object for modeset changes
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* @dev: DRM device
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* @state: the driver state object
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*
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* Check the state object to see if the requested state is physically possible.
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* This does all the crtc and connector related computations for an atomic
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* update. It computes and updates crtc_state->mode_changed, adds any additional
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* connectors needed for full modesets and calls down into ->mode_fixup
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* functions of the driver backend.
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*
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* IMPORTANT:
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*
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* Drivers which update ->mode_changed (e.g. in their ->atomic_check hooks if a
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* plane update can't be done without a full modeset) _must_ call this function
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* afterwards after that change. It is permitted to call this function multiple
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* times for the same update, e.g. when the ->atomic_check functions depend upon
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* the adjusted dotclock for fifo space allocation and watermark computation.
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*
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* RETURNS
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* Zero for success or -errno
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*/
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int
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drm_atomic_helper_check_modeset(struct drm_device *dev,
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struct drm_atomic_state *state)
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{
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@ -406,23 +428,23 @@ drm_atomic_helper_check_modeset(struct drm_device *dev,
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return mode_fixup(state);
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}
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EXPORT_SYMBOL(drm_atomic_helper_check_modeset);
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/**
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* drm_atomic_helper_check - validate state object
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* drm_atomic_helper_check - validate state object for modeset changes
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* @dev: DRM device
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* @state: the driver state object
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*
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* Check the state object to see if the requested state is physically possible.
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* Only crtcs and planes have check callbacks, so for any additional (global)
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* checking that a driver needs it can simply wrap that around this function.
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* Drivers without such needs can directly use this as their ->atomic_check()
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* callback.
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* This does all the plane update related checks using by calling into the
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* ->atomic_check hooks provided by the driver.
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*
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* RETURNS
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* Zero for success or -errno
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*/
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int drm_atomic_helper_check(struct drm_device *dev,
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struct drm_atomic_state *state)
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int
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drm_atomic_helper_check_planes(struct drm_device *dev,
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struct drm_atomic_state *state)
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{
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int nplanes = dev->mode_config.num_total_plane;
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int ncrtcs = dev->mode_config.num_crtc;
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@ -471,6 +493,33 @@ int drm_atomic_helper_check(struct drm_device *dev,
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}
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}
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return ret;
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}
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EXPORT_SYMBOL(drm_atomic_helper_check_planes);
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/**
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* drm_atomic_helper_check - validate state object
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* @dev: DRM device
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* @state: the driver state object
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*
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* Check the state object to see if the requested state is physically possible.
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* Only crtcs and planes have check callbacks, so for any additional (global)
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* checking that a driver needs it can simply wrap that around this function.
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* Drivers without such needs can directly use this as their ->atomic_check()
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* callback.
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*
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* RETURNS
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* Zero for success or -errno
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*/
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int drm_atomic_helper_check(struct drm_device *dev,
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struct drm_atomic_state *state)
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{
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int ret;
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ret = drm_atomic_helper_check_planes(dev, state);
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if (ret)
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return ret;
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ret = drm_atomic_helper_check_modeset(dev, state);
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if (ret)
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return ret;
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@ -30,6 +30,10 @@
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#include <drm/drm_crtc.h>
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int drm_atomic_helper_check_modeset(struct drm_device *dev,
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struct drm_atomic_state *state);
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int drm_atomic_helper_check_planes(struct drm_device *dev,
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struct drm_atomic_state *state);
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int drm_atomic_helper_check(struct drm_device *dev,
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struct drm_atomic_state *state);
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int drm_atomic_helper_commit(struct drm_device *dev,
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@ -238,6 +238,7 @@ struct drm_atomic_state;
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/**
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* struct drm_crtc_state - mutable CRTC state
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* @enable: whether the CRTC should be enabled, gates all other state
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* @active: whether the CRTC is actively displaying (used for DPMS)
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* @mode_changed: for use by helpers and drivers when computing state updates
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* @plane_mask: bitmask of (1 << drm_plane_index(plane)) of attached planes
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* @last_vblank_count: for helpers and drivers to capture the vblank of the
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@ -248,9 +249,16 @@ struct drm_atomic_state;
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* @event: optional pointer to a DRM event to signal upon completion of the
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* state update
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* @state: backpointer to global drm_atomic_state
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*
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* Note that the distinction between @enable and @active is rather subtile:
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* Flipping @active while @enable is set without changing anything else may
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* never return in a failure from the ->atomic_check callback. Userspace assumes
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* that a DPMS On will always succeed. In other words: @enable controls resource
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* assignment, @active controls the actual hardware state.
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*/
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struct drm_crtc_state {
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bool enable;
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bool active;
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/* computed state bits used by helpers and drivers */
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bool planes_changed : 1;
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