forked from Minki/linux
drm/doc: use inline kerneldoc style for drm_crtc_state
Lots of added text here since I think the various control flow bits are worth explaining a bit better. v2: Fix conflict with Boris' no_vblank addition. Reviewed-by: Sean Paul <seanpaul@chromium.org> Signed-off-by: Daniel Vetter <daniel.vetter@intel.com> Link: https://patchwork.freedesktop.org/patch/msgid/20180709084016.23750-15-daniel.vetter@ffwll.ch
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Daniel Vetter
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7f9e7ec92b
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620eec75f3
@ -77,21 +77,6 @@ struct drm_plane_helper_funcs;
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/**
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* struct drm_crtc_state - mutable CRTC state
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* @crtc: backpointer to the CRTC
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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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* @planes_changed: planes on this crtc are updated
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* @mode_changed: @mode or @enable has been changed
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* @active_changed: @active has been toggled.
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* @connectors_changed: connectors to this crtc have been updated
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* @zpos_changed: zpos values of planes on this crtc have been updated
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* @color_mgmt_changed: color management properties have changed (degamma or
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* gamma LUT or CSC matrix)
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* @plane_mask: bitmask of (1 << drm_plane_index(plane)) of attached planes
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* @connector_mask: bitmask of (1 << drm_connector_index(connector)) of attached connectors
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* @encoder_mask: bitmask of (1 << drm_encoder_index(encoder)) of attached encoders
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* @mode_blob: &drm_property_blob for @mode
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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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@ -102,21 +87,86 @@ struct drm_plane_helper_funcs;
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*
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* The three booleans active_changed, connectors_changed and mode_changed are
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* intended to indicate whether a full modeset is needed, rather than strictly
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* describing what has changed in a commit.
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* See also: drm_atomic_crtc_needs_modeset()
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* describing what has changed in a commit. See also:
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* drm_atomic_crtc_needs_modeset()
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*
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* WARNING: Transitional helpers (like drm_helper_crtc_mode_set() or
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* drm_helper_crtc_mode_set_base()) do not maintain many of the derived control
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* state like @plane_mask so drivers not converted over to atomic helpers should
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* not rely on these being accurate!
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*/
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struct drm_crtc_state {
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/** @crtc: backpointer to the CRTC */
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struct drm_crtc *crtc;
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/**
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* @enable: Whether the CRTC should be enabled, gates all other state.
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* This controls reservations of shared resources. Actual hardware state
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* is controlled by @active.
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*/
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bool enable;
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/**
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* @active: Whether the CRTC is actively displaying (used for DPMS).
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* Implies that @enable is set. The driver must not release any shared
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* resources if @active is set to false but @enable still true, because
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* userspace expects that a DPMS ON always succeeds.
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*
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* Hence drivers must not consult @active in their various
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* &drm_mode_config_funcs.atomic_check callback to reject an atomic
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* commit. They can consult it to aid in the computation of derived
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* hardware state, since even in the DPMS OFF state the display hardware
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* should be as much powered down as when the CRTC is completely
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* disabled through setting @enable to false.
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*/
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bool active;
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/* computed state bits used by helpers and drivers */
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/**
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* @planes_changed: Planes on this crtc are updated. Used by the atomic
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* helpers and drivers to steer the atomic commit control flow.
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*/
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bool planes_changed : 1;
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/**
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* @mode_changed: @mode or @enable has been changed. Used by the atomic
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* helpers and drivers to steer the atomic commit control flow. See also
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* drm_atomic_crtc_needs_modeset().
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*
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* Drivers are supposed to set this for any CRTC state changes that
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* require a full modeset. They can also reset it to false if e.g. a
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* @mode change can be done without a full modeset by only changing
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* scaler settings.
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*/
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bool mode_changed : 1;
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/**
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* @active_changed: @active has been toggled. Used by the atomic
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* helpers and drivers to steer the atomic commit control flow. See also
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* drm_atomic_crtc_needs_modeset().
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*/
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bool active_changed : 1;
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/**
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* @connectors_changed: Connectors to this crtc have been updated,
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* either in their state or routing. Used by the atomic
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* helpers and drivers to steer the atomic commit control flow. See also
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* drm_atomic_crtc_needs_modeset().
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*
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* Drivers are supposed to set this as-needed from their own atomic
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* check code, e.g. from &drm_encoder_helper_funcs.atomic_check
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*/
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bool connectors_changed : 1;
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/**
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* @zpos_changed: zpos values of planes on this crtc have been updated.
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* Used by the atomic helpers and drivers to steer the atomic commit
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* control flow.
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*/
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bool zpos_changed : 1;
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/**
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* @color_mgmt_changed: Color management properties have changed
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* (@gamma_lut, @degamma_lut or @ctm). Used by the atomic helpers and
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* drivers to steer the atomic commit control flow.
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*/
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bool color_mgmt_changed : 1;
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/**
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@ -142,14 +192,22 @@ struct drm_crtc_state {
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*/
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bool no_vblank : 1;
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/* attached planes bitmask:
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* WARNING: transitional helpers do not maintain plane_mask so
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* drivers not converted over to atomic helpers should not rely
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* on plane_mask being accurate!
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/**
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* @plane_mask: Bitmask of drm_plane_mask(plane) of planes attached to
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* this CRTC.
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*/
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u32 plane_mask;
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/**
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* @connector_mask: Bitmask of drm_connector_mask(connector) of
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* connectors attached to this CRTC.
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*/
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u32 connector_mask;
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/**
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* @encoder_mask: Bitmask of drm_encoder_mask(encoder) of encoders
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* attached to this CRTC.
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*/
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u32 encoder_mask;
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/**
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@ -159,7 +217,7 @@ struct drm_crtc_state {
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* differences between the mode requested by userspace in @mode and what
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* is actually programmed into the hardware.
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*
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* For drivers using drm_bridge, this stores hardware display timings
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* For drivers using &drm_bridge, this stores hardware display timings
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* used between the CRTC and the first bridge. For other drivers, the
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* meaning of the adjusted_mode field is purely driver implementation
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* defined information, and will usually be used to store the hardware
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@ -184,7 +242,10 @@ struct drm_crtc_state {
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*/
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struct drm_display_mode mode;
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/* blob property to expose current mode to atomic userspace */
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/**
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* @mode_blob: &drm_property_blob for @mode, for exposing the mode to
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* atomic userspace.
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*/
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struct drm_property_blob *mode_blob;
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/**
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@ -288,6 +349,7 @@ struct drm_crtc_state {
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*/
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struct drm_crtc_commit *commit;
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/** @state: backpointer to global drm_atomic_state */
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struct drm_atomic_state *state;
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};
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