From: "Pandiyan, Dhinakaran" dhinakaran.pandiyan@intel.com
Having an ->atomic_release callback is useful to release shared resources that get allocated in compute_config(). This function is expected to be called in the atomic_check() phase before new resources are acquired.
v5: Return an int (Maarten) v4: Document that the function is conditionally called and before other atomic_checks() (Daniel) v3: Use the new 'for_each_oldnew_connector_in_state()' macro. v2: Moved the caller hunk to this patch (Daniel)
Cc: Daniel Vetter daniel.vetter@ffwll.ch Cc: Maarten Lankhorst maarten.lankhorst@linux.intel.com Cc: Archit Taneja architt@codeaurora.org Cc: Chris Wilson chris@chris-wilson.co.uk Cc: Harry Wentland Harry.wentland@amd.com Reviewed-by: Maarten Lankhorst maarten.lankhorst@linux.intel.com Reviewed-by: Daniel Vetter daniel.vetter@ffwll.ch Suggested-by: Daniel Vetter daniel.vetter@ffwll.ch Signed-off-by: Dhinakaran Pandiyan dhinakaran.pandiyan@intel.com --- drivers/gpu/drm/drm_atomic_helper.c | 22 ++++++++++++++++++++++ include/drm/drm_modeset_helper_vtables.h | 20 ++++++++++++++++++++ 2 files changed, 42 insertions(+)
diff --git a/drivers/gpu/drm/drm_atomic_helper.c b/drivers/gpu/drm/drm_atomic_helper.c index d14094d..57d2e50 100644 --- a/drivers/gpu/drm/drm_atomic_helper.c +++ b/drivers/gpu/drm/drm_atomic_helper.c @@ -586,6 +586,28 @@ drm_atomic_helper_check_modeset(struct drm_device *dev, } }
+ for_each_oldnew_connector_in_state(state, connector, old_connector_state, new_connector_state, i) { + const struct drm_connector_helper_funcs *conn_funcs; + struct drm_crtc_state *crtc_state; + + conn_funcs = connector->helper_private; + if (!conn_funcs->atomic_release) + continue; + + if (!old_connector_state->crtc) + continue; + + crtc_state = drm_atomic_get_existing_crtc_state(state, old_connector_state->crtc); + + if (crtc_state->connectors_changed || + crtc_state->mode_changed || + (crtc_state->active_changed && !crtc_state->active)) { + ret = conn_funcs->atomic_release(connector, new_connector_state); + if (ret != 0) + return ret; + } + } + return mode_fixup(state); } EXPORT_SYMBOL(drm_atomic_helper_check_modeset); diff --git a/include/drm/drm_modeset_helper_vtables.h b/include/drm/drm_modeset_helper_vtables.h index 091c422..36a4b16 100644 --- a/include/drm/drm_modeset_helper_vtables.h +++ b/include/drm/drm_modeset_helper_vtables.h @@ -836,6 +836,26 @@ struct drm_connector_helper_funcs { */ struct drm_encoder *(*atomic_best_encoder)(struct drm_connector *connector, struct drm_connector_state *connector_state); + + /** + * @atomic_release: + * + * This function is conditionally called to release shared resources + * when the attached CRTC's mode changes or it's connectors change or + * becomes inactive. It is called before the corresponding + * &drm_crtc_helper_funcs.atomic_check or + * &drm_crtc_helper_funcs.mode_fixup hooks are called. + * + * NOTE: + * + * This function is called in the check phase of an atomic update. + * + * RETURNS: + * + * 0 on success or negative error codes on failure. + */ + int (*atomic_release)(struct drm_connector *connector, + struct drm_connector_state *connector_state); };
/**