drm/atomic: add commit_planes_on_crtc helper
drm_atomic_helper_commit_planes calls all atomic_begin's first, then updates all planes, finally calling atomic_flush. Some drivers may want to things like disabling irq's from their atomic_begin, in which case a second call to atomic_begin will splat. By using commit_planes_on_crtc on each crtc in the atomic state they'll evade that issue. Signed-off-by: Maarten Lankhorst <maarten.lankhorst@linux.intel.com> [danvet: Extend kerneldoc a bit as discussed with Maarten on irc.] [danvet: Squash in fixup to check for crtc_funcs in all places. Reported by Dan Carpenter.] Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
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@ -1127,6 +1127,10 @@ EXPORT_SYMBOL(drm_atomic_helper_prepare_planes);
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*
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* It still requires the global state object @old_state to know which planes and
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* crtcs need to be updated though.
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*
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* Note that this function does all plane updates across all CRTCs in one step.
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* If the hardware can't support this approach look at
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* drm_atomic_helper_commit_planes_on_crtc() instead.
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*/
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void drm_atomic_helper_commit_planes(struct drm_device *dev,
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struct drm_atomic_state *old_state)
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@ -1180,6 +1184,64 @@ void drm_atomic_helper_commit_planes(struct drm_device *dev,
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}
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EXPORT_SYMBOL(drm_atomic_helper_commit_planes);
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/**
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* drm_atomic_helper_commit_planes_on_crtc - commit plane state for a crtc
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* @old_crtc_state: atomic state object with the old crtc state
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*
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* This function commits the new plane state using the plane and atomic helper
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* functions for planes on the specific crtc. It assumes that the atomic state
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* has already been pushed into the relevant object state pointers, since this
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* step can no longer fail.
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*
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* This function is useful when plane updates should be done crtc-by-crtc
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* instead of one global step like drm_atomic_helper_commit_planes() does.
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*
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* This function can only be savely used when planes are not allowed to move
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* between different CRTCs because this function doesn't handle inter-CRTC
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* depencies. Callers need to ensure that either no such depencies exist,
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* resolve them through ordering of commit calls or through some other means.
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*/
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void
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drm_atomic_helper_commit_planes_on_crtc(struct drm_crtc_state *old_crtc_state)
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{
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const struct drm_crtc_helper_funcs *crtc_funcs;
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struct drm_crtc *crtc = old_crtc_state->crtc;
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struct drm_atomic_state *old_state = old_crtc_state->state;
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struct drm_plane *plane;
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unsigned plane_mask;
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plane_mask = old_crtc_state->plane_mask;
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plane_mask |= crtc->state->plane_mask;
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crtc_funcs = crtc->helper_private;
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if (crtc_funcs && crtc_funcs->atomic_begin)
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crtc_funcs->atomic_begin(crtc);
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drm_for_each_plane_mask(plane, crtc->dev, plane_mask) {
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struct drm_plane_state *old_plane_state =
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drm_atomic_get_existing_plane_state(old_state, plane);
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const struct drm_plane_helper_funcs *plane_funcs;
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plane_funcs = plane->helper_private;
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if (!old_plane_state || !plane_funcs)
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continue;
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WARN_ON(plane->state->crtc && plane->state->crtc != crtc);
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if (drm_atomic_plane_disabling(plane, old_plane_state) &&
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plane_funcs->atomic_disable)
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plane_funcs->atomic_disable(plane, old_plane_state);
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else if (plane->state->crtc ||
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drm_atomic_plane_disabling(plane, old_plane_state))
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plane_funcs->atomic_update(plane, old_plane_state);
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}
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if (crtc_funcs && crtc_funcs->atomic_flush)
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crtc_funcs->atomic_flush(crtc);
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}
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EXPORT_SYMBOL(drm_atomic_helper_commit_planes_on_crtc);
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/**
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* drm_atomic_helper_cleanup_planes - cleanup plane resources after commit
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* @dev: DRM device
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@ -58,6 +58,7 @@ void drm_atomic_helper_commit_planes(struct drm_device *dev,
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struct drm_atomic_state *state);
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void drm_atomic_helper_cleanup_planes(struct drm_device *dev,
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struct drm_atomic_state *old_state);
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void drm_atomic_helper_commit_planes_on_crtc(struct drm_crtc_state *old_crtc_state);
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void drm_atomic_helper_swap_state(struct drm_device *dev,
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struct drm_atomic_state *state);
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