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Diffstat (limited to 'include/drm/drm_crtc.h')
| -rw-r--r-- | include/drm/drm_crtc.h | 23 |
1 files changed, 23 insertions, 0 deletions
diff --git a/include/drm/drm_crtc.h b/include/drm/drm_crtc.h index 23eddbccab10..17f4f93340b8 100644 --- a/include/drm/drm_crtc.h +++ b/include/drm/drm_crtc.h @@ -119,6 +119,29 @@ struct drm_crtc_state { bool zpos_changed : 1; bool color_mgmt_changed : 1; + /** + * @no_vblank: + * + * Reflects the ability of a CRTC to send VBLANK events. This state + * usually depends on the pipeline configuration, and the main usuage + * is CRTCs feeding a writeback connector operating in oneshot mode. + * In this case the VBLANK event is only generated when a job is queued + * to the writeback connector, and we want the core to fake VBLANK + * events when this part of the pipeline hasn't changed but others had + * or when the CRTC and connectors are being disabled. + * + * __drm_atomic_helper_crtc_duplicate_state() will not reset the value + * from the current state, the CRTC driver is then responsible for + * updating this field when needed. + * + * Note that the combination of &drm_crtc_state.event == NULL and + * &drm_crtc_state.no_blank == true is valid and usually used when the + * writeback connector attached to the CRTC has a new job queued. In + * this case the driver will send the VBLANK event on its own when the + * writeback job is complete. + */ + bool no_vblank : 1; + /* attached planes bitmask: * WARNING: transitional helpers do not maintain plane_mask so * drivers not converted over to atomic helpers should not rely |