WebSVN – Kolibri OS – Blame – /drivers/video/drm/drm_atomic_helper.c

Rev	Author	Line No.	Line
6084	serge	1	/*
		2	* Copyright (C) 2014 Red Hat
		3	* Copyright (C) 2014 Intel Corp.
		4	*
		5	* Permission is hereby granted, free of charge, to any person obtaining a
		6	* copy of this software and associated documentation files (the "Software"),
		7	* to deal in the Software without restriction, including without limitation
		8	* the rights to use, copy, modify, merge, publish, distribute, sublicense,
		9	* and/or sell copies of the Software, and to permit persons to whom the
		10	* Software is furnished to do so, subject to the following conditions:
		11	*
		12	* The above copyright notice and this permission notice shall be included in
		13	* all copies or substantial portions of the Software.
		14	*
		15	* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
		16	* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
		17	* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
		18	* THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
		19	* OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
		20	* ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
		21	* OTHER DEALINGS IN THE SOFTWARE.
		22	*
		23	* Authors:
		24	* Rob Clark
		25	* Daniel Vetter
		26	*/
		27
		28	#include
		29	#include
		30	#include
		31	#include
		32	#include
		33	#include
		34
		35	/**
		36	* DOC: overview
		37	*
		38	* This helper library provides implementations of check and commit functions on
		39	* top of the CRTC modeset helper callbacks and the plane helper callbacks. It
		40	* also provides convenience implementations for the atomic state handling
		41	* callbacks for drivers which don't need to subclass the drm core structures to
		42	* add their own additional internal state.
		43	*
		44	* This library also provides default implementations for the check callback in
		45	* drm_atomic_helper_check() and for the commit callback with
		46	* drm_atomic_helper_commit(). But the individual stages and callbacks are
		47	* exposed to allow drivers to mix and match and e.g. use the plane helpers only
		48	* together with a driver private modeset implementation.
		49	*
		50	* This library also provides implementations for all the legacy driver
		51	* interfaces on top of the atomic interface. See drm_atomic_helper_set_config(),
		52	* drm_atomic_helper_disable_plane(), drm_atomic_helper_disable_plane() and the
		53	* various functions to implement set_property callbacks. New drivers must not
		54	* implement these functions themselves but must use the provided helpers.
		55	*/
		56	static void
		57	drm_atomic_helper_plane_changed(struct drm_atomic_state *state,
		58	struct drm_plane_state *plane_state,
		59	struct drm_plane *plane)
		60	{
		61	struct drm_crtc_state *crtc_state;
		62
		63	if (plane->state->crtc) {
		64	crtc_state = state->crtc_states[drm_crtc_index(plane->state->crtc)];
		65
		66	if (WARN_ON(!crtc_state))
		67	return;
		68
		69	crtc_state->planes_changed = true;
		70	}
		71
		72	if (plane_state->crtc) {
		73	crtc_state =
		74	state->crtc_states[drm_crtc_index(plane_state->crtc)];
		75
		76	if (WARN_ON(!crtc_state))
		77	return;
		78
		79	crtc_state->planes_changed = true;
		80	}
		81	}
		82
		83	static struct drm_crtc *
		84	get_current_crtc_for_encoder(struct drm_device *dev,
		85	struct drm_encoder *encoder)
		86	{
		87	struct drm_mode_config *config = &dev->mode_config;
		88	struct drm_connector *connector;
		89
		90	WARN_ON(!drm_modeset_is_locked(&config->connection_mutex));
		91
		92	drm_for_each_connector(connector, dev) {
		93	if (connector->state->best_encoder != encoder)
		94	continue;
		95
		96	return connector->state->crtc;
		97	}
		98
		99	return NULL;
		100	}
		101
		102	static int
		103	steal_encoder(struct drm_atomic_state *state,
		104	struct drm_encoder *encoder,
		105	struct drm_crtc *encoder_crtc)
		106	{
		107	struct drm_mode_config *config = &state->dev->mode_config;
		108	struct drm_crtc_state *crtc_state;
		109	struct drm_connector *connector;
		110	struct drm_connector_state *connector_state;
		111	int ret;
		112
		113	/*
		114	* We can only steal an encoder coming from a connector, which means we
		115	* must already hold the connection_mutex.
		116	*/
		117	WARN_ON(!drm_modeset_is_locked(&config->connection_mutex));
		118
		119	DRM_DEBUG_ATOMIC("[ENCODER:%d:%s] in use on [CRTC:%d], stealing it\n",
		120	encoder->base.id, encoder->name,
		121	encoder_crtc->base.id);
		122
		123	crtc_state = drm_atomic_get_crtc_state(state, encoder_crtc);
		124	if (IS_ERR(crtc_state))
		125	return PTR_ERR(crtc_state);
		126
		127	crtc_state->connectors_changed = true;
		128
		129	list_for_each_entry(connector, &config->connector_list, head) {
		130	if (connector->state->best_encoder != encoder)
		131	continue;
		132
		133	DRM_DEBUG_ATOMIC("Stealing encoder from [CONNECTOR:%d:%s]\n",
		134	connector->base.id,
		135	connector->name);
		136
		137	connector_state = drm_atomic_get_connector_state(state,
		138	connector);
		139	if (IS_ERR(connector_state))
		140	return PTR_ERR(connector_state);
		141
		142	ret = drm_atomic_set_crtc_for_connector(connector_state, NULL);
		143	if (ret)
		144	return ret;
		145	connector_state->best_encoder = NULL;
		146	}
		147
		148	return 0;
		149	}
		150
		151	static int
		152	update_connector_routing(struct drm_atomic_state *state, int conn_idx)
		153	{
		154	const struct drm_connector_helper_funcs *funcs;
		155	struct drm_encoder *new_encoder;
		156	struct drm_crtc *encoder_crtc;
		157	struct drm_connector *connector;
		158	struct drm_connector_state *connector_state;
		159	struct drm_crtc_state *crtc_state;
		160	int idx, ret;
		161
		162	connector = state->connectors[conn_idx];
		163	connector_state = state->connector_states[conn_idx];
		164
		165	if (!connector)
		166	return 0;
		167
		168	DRM_DEBUG_ATOMIC("Updating routing for [CONNECTOR:%d:%s]\n",
		169	connector->base.id,
		170	connector->name);
		171
		172	if (connector->state->crtc != connector_state->crtc) {
		173	if (connector->state->crtc) {
		174	idx = drm_crtc_index(connector->state->crtc);
		175
		176	crtc_state = state->crtc_states[idx];
		177	crtc_state->connectors_changed = true;
		178	}
		179
		180	if (connector_state->crtc) {
		181	idx = drm_crtc_index(connector_state->crtc);
		182
		183	crtc_state = state->crtc_states[idx];
		184	crtc_state->connectors_changed = true;
		185	}
		186	}
		187
		188	if (!connector_state->crtc) {
		189	DRM_DEBUG_ATOMIC("Disabling [CONNECTOR:%d:%s]\n",
		190	connector->base.id,
		191	connector->name);
		192
		193	connector_state->best_encoder = NULL;
		194
		195	return 0;
		196	}
		197
		198	funcs = connector->helper_private;
		199
		200	if (funcs->atomic_best_encoder)
		201	new_encoder = funcs->atomic_best_encoder(connector,
		202	connector_state);
		203	else
		204	new_encoder = funcs->best_encoder(connector);
		205
		206	if (!new_encoder) {
		207	DRM_DEBUG_ATOMIC("No suitable encoder found for [CONNECTOR:%d:%s]\n",
		208	connector->base.id,
		209	connector->name);
		210	return -EINVAL;
		211	}
		212
		213	if (!drm_encoder_crtc_ok(new_encoder, connector_state->crtc)) {
		214	DRM_DEBUG_ATOMIC("[ENCODER:%d:%s] incompatible with [CRTC:%d]\n",
		215	new_encoder->base.id,
		216	new_encoder->name,
		217	connector_state->crtc->base.id);
		218	return -EINVAL;
		219	}
		220
		221	if (new_encoder == connector_state->best_encoder) {
		222	DRM_DEBUG_ATOMIC("[CONNECTOR:%d:%s] keeps [ENCODER:%d:%s], now on [CRTC:%d]\n",
		223	connector->base.id,
		224	connector->name,
		225	new_encoder->base.id,
		226	new_encoder->name,
		227	connector_state->crtc->base.id);
		228
		229	return 0;
		230	}
		231
		232	encoder_crtc = get_current_crtc_for_encoder(state->dev,
		233	new_encoder);
		234
		235	if (encoder_crtc) {
		236	ret = steal_encoder(state, new_encoder, encoder_crtc);
		237	if (ret) {
		238	DRM_DEBUG_ATOMIC("Encoder stealing failed for [CONNECTOR:%d:%s]\n",
		239	connector->base.id,
		240	connector->name);
		241	return ret;
		242	}
		243	}
		244
		245	if (WARN_ON(!connector_state->crtc))
		246	return -EINVAL;
		247
		248	connector_state->best_encoder = new_encoder;
		249	idx = drm_crtc_index(connector_state->crtc);
		250
		251	crtc_state = state->crtc_states[idx];
		252	crtc_state->connectors_changed = true;
		253
		254	DRM_DEBUG_ATOMIC("[CONNECTOR:%d:%s] using [ENCODER:%d:%s] on [CRTC:%d]\n",
		255	connector->base.id,
		256	connector->name,
		257	new_encoder->base.id,
		258	new_encoder->name,
		259	connector_state->crtc->base.id);
		260
		261	return 0;
		262	}
		263
		264	static int
		265	mode_fixup(struct drm_atomic_state *state)
		266	{
		267	struct drm_crtc *crtc;
		268	struct drm_crtc_state *crtc_state;
		269	struct drm_connector *connector;
		270	struct drm_connector_state *conn_state;
		271	int i;
		272	bool ret;
		273
		274	for_each_crtc_in_state(state, crtc, crtc_state, i) {
		275	if (!crtc_state->mode_changed &&
		276	!crtc_state->connectors_changed)
		277	continue;
		278
		279	drm_mode_copy(&crtc_state->adjusted_mode, &crtc_state->mode);
		280	}
		281
		282	for_each_connector_in_state(state, connector, conn_state, i) {
		283	const struct drm_encoder_helper_funcs *funcs;
		284	struct drm_encoder *encoder;
		285
		286	WARN_ON(!!conn_state->best_encoder != !!conn_state->crtc);
		287
		288	if (!conn_state->crtc \|\| !conn_state->best_encoder)
		289	continue;
		290
		291	crtc_state =
		292	state->crtc_states[drm_crtc_index(conn_state->crtc)];
		293
		294	/*
		295	* Each encoder has at most one connector (since we always steal
		296	* it away), so we won't call ->mode_fixup twice.
		297	*/
		298	encoder = conn_state->best_encoder;
		299	funcs = encoder->helper_private;
		300	if (!funcs)
		301	continue;
		302
		303	ret = drm_bridge_mode_fixup(encoder->bridge, &crtc_state->mode,
		304	&crtc_state->adjusted_mode);
		305	if (!ret) {
		306	DRM_DEBUG_ATOMIC("Bridge fixup failed\n");
		307	return -EINVAL;
		308	}
		309
		310	if (funcs->atomic_check) {
		311	ret = funcs->atomic_check(encoder, crtc_state,
		312	conn_state);
		313	if (ret) {
		314	DRM_DEBUG_ATOMIC("[ENCODER:%d:%s] check failed\n",
		315	encoder->base.id, encoder->name);
		316	return ret;
		317	}
		318	} else if (funcs->mode_fixup) {
		319	ret = funcs->mode_fixup(encoder, &crtc_state->mode,
		320	&crtc_state->adjusted_mode);
		321	if (!ret) {
		322	DRM_DEBUG_ATOMIC("[ENCODER:%d:%s] fixup failed\n",
		323	encoder->base.id, encoder->name);
		324	return -EINVAL;
		325	}
		326	}
		327	}
		328
		329	for_each_crtc_in_state(state, crtc, crtc_state, i) {
		330	const struct drm_crtc_helper_funcs *funcs;
		331
		332	if (!crtc_state->mode_changed &&
		333	!crtc_state->connectors_changed)
		334	continue;
		335
		336	funcs = crtc->helper_private;
		337	if (!funcs->mode_fixup)
		338	continue;
		339
		340	ret = funcs->mode_fixup(crtc, &crtc_state->mode,
		341	&crtc_state->adjusted_mode);
		342	if (!ret) {
		343	DRM_DEBUG_ATOMIC("[CRTC:%d] fixup failed\n",
		344	crtc->base.id);
		345	return -EINVAL;
		346	}
		347	}
		348
		349	return 0;
		350	}
		351
		352	/**
		353	* drm_atomic_helper_check_modeset - validate state object for modeset changes
		354	* @dev: DRM device
		355	* @state: the driver state object
		356	*
		357	* Check the state object to see if the requested state is physically possible.
		358	* This does all the crtc and connector related computations for an atomic
		359	* update and adds any additional connectors needed for full modesets and calls
		360	* down into ->mode_fixup functions of the driver backend.
		361	*
		362	* crtc_state->mode_changed is set when the input mode is changed.
		363	* crtc_state->connectors_changed is set when a connector is added or
		364	* removed from the crtc.
		365	* crtc_state->active_changed is set when crtc_state->active changes,
		366	* which is used for dpms.
		367	*
		368	* IMPORTANT:
		369	*
		370	* Drivers which update ->mode_changed (e.g. in their ->atomic_check hooks if a
		371	* plane update can't be done without a full modeset) _must_ call this function
		372	* afterwards after that change. It is permitted to call this function multiple
		373	* times for the same update, e.g. when the ->atomic_check functions depend upon
		374	* the adjusted dotclock for fifo space allocation and watermark computation.
		375	*
		376	* RETURNS
		377	* Zero for success or -errno
		378	*/
		379	int
		380	drm_atomic_helper_check_modeset(struct drm_device *dev,
		381	struct drm_atomic_state *state)
		382	{
		383	struct drm_crtc *crtc;
		384	struct drm_crtc_state *crtc_state;
		385	struct drm_connector *connector;
		386	struct drm_connector_state *connector_state;
		387	int i, ret;
		388
		389	for_each_crtc_in_state(state, crtc, crtc_state, i) {
		390	if (!drm_mode_equal(&crtc->state->mode, &crtc_state->mode)) {
		391	DRM_DEBUG_ATOMIC("[CRTC:%d] mode changed\n",
		392	crtc->base.id);
		393	crtc_state->mode_changed = true;
		394	}
		395
		396	if (crtc->state->enable != crtc_state->enable) {
		397	DRM_DEBUG_ATOMIC("[CRTC:%d] enable changed\n",
		398	crtc->base.id);
		399
		400	/*
		401	* For clarity this assignment is done here, but
		402	* enable == 0 is only true when there are no
		403	* connectors and a NULL mode.
		404	*
		405	* The other way around is true as well. enable != 0
		406	* iff connectors are attached and a mode is set.
		407	*/
		408	crtc_state->mode_changed = true;
		409	crtc_state->connectors_changed = true;
		410	}
		411	}
		412
		413	for_each_connector_in_state(state, connector, connector_state, i) {
		414	/*
		415	* This only sets crtc->mode_changed for routing changes,
		416	* drivers must set crtc->mode_changed themselves when connector
		417	* properties need to be updated.
		418	*/
		419	ret = update_connector_routing(state, i);
		420	if (ret)
		421	return ret;
		422	}
		423
		424	/*
		425	* After all the routing has been prepared we need to add in any
		426	* connector which is itself unchanged, but who's crtc changes it's
		427	* configuration. This must be done before calling mode_fixup in case a
		428	* crtc only changed its mode but has the same set of connectors.
		429	*/
		430	for_each_crtc_in_state(state, crtc, crtc_state, i) {
		431	int num_connectors;
		432
		433	/*
		434	* We must set ->active_changed after walking connectors for
		435	* otherwise an update that only changes active would result in
		436	* a full modeset because update_connector_routing force that.
		437	*/
		438	if (crtc->state->active != crtc_state->active) {
		439	DRM_DEBUG_ATOMIC("[CRTC:%d] active changed\n",
		440	crtc->base.id);
		441	crtc_state->active_changed = true;
		442	}
		443
		444	if (!drm_atomic_crtc_needs_modeset(crtc_state))
		445	continue;
		446
		447	DRM_DEBUG_ATOMIC("[CRTC:%d] needs all connectors, enable: %c, active: %c\n",
		448	crtc->base.id,
		449	crtc_state->enable ? 'y' : 'n',
		450	crtc_state->active ? 'y' : 'n');
		451
		452	ret = drm_atomic_add_affected_connectors(state, crtc);
		453	if (ret != 0)
		454	return ret;
		455
		456	ret = drm_atomic_add_affected_planes(state, crtc);
		457	if (ret != 0)
		458	return ret;
		459
		460	num_connectors = drm_atomic_connectors_for_crtc(state,
		461	crtc);
		462
		463	if (crtc_state->enable != !!num_connectors) {
		464	DRM_DEBUG_ATOMIC("[CRTC:%d] enabled/connectors mismatch\n",
		465	crtc->base.id);
		466
		467	return -EINVAL;
		468	}
		469	}
		470
		471	return mode_fixup(state);
		472	}
		473	EXPORT_SYMBOL(drm_atomic_helper_check_modeset);
		474
		475	/**
		476	* drm_atomic_helper_check_planes - validate state object for planes changes
		477	* @dev: DRM device
		478	* @state: the driver state object
		479	*
		480	* Check the state object to see if the requested state is physically possible.
		481	* This does all the plane update related checks using by calling into the
		482	* ->atomic_check hooks provided by the driver.
		483	*
		484	* It also sets crtc_state->planes_changed to indicate that a crtc has
		485	* updated planes.
		486	*
		487	* RETURNS
		488	* Zero for success or -errno
		489	*/
		490	int
		491	drm_atomic_helper_check_planes(struct drm_device *dev,
		492	struct drm_atomic_state *state)
		493	{
		494	struct drm_crtc *crtc;
		495	struct drm_crtc_state *crtc_state;
		496	struct drm_plane *plane;
		497	struct drm_plane_state *plane_state;
		498	int i, ret = 0;
		499
		500	for_each_plane_in_state(state, plane, plane_state, i) {
		501	const struct drm_plane_helper_funcs *funcs;
		502
		503	funcs = plane->helper_private;
		504
		505	drm_atomic_helper_plane_changed(state, plane_state, plane);
		506
		507	if (!funcs \|\| !funcs->atomic_check)
		508	continue;
		509
		510	ret = funcs->atomic_check(plane, plane_state);
		511	if (ret) {
		512	DRM_DEBUG_ATOMIC("[PLANE:%d] atomic driver check failed\n",
		513	plane->base.id);
		514	return ret;
		515	}
		516	}
		517
		518	for_each_crtc_in_state(state, crtc, crtc_state, i) {
		519	const struct drm_crtc_helper_funcs *funcs;
		520
		521	funcs = crtc->helper_private;
		522
		523	if (!funcs \|\| !funcs->atomic_check)
		524	continue;
		525
		526	ret = funcs->atomic_check(crtc, state->crtc_states[i]);
		527	if (ret) {
		528	DRM_DEBUG_ATOMIC("[CRTC:%d] atomic driver check failed\n",
		529	crtc->base.id);
		530	return ret;
		531	}
		532	}
		533
		534	return ret;
		535	}
		536	EXPORT_SYMBOL(drm_atomic_helper_check_planes);
		537
		538	/**
		539	* drm_atomic_helper_check - validate state object
		540	* @dev: DRM device
		541	* @state: the driver state object
		542	*
		543	* Check the state object to see if the requested state is physically possible.
		544	* Only crtcs and planes have check callbacks, so for any additional (global)
		545	* checking that a driver needs it can simply wrap that around this function.
		546	* Drivers without such needs can directly use this as their ->atomic_check()
		547	* callback.
		548	*
		549	* This just wraps the two parts of the state checking for planes and modeset
		550	* state in the default order: First it calls drm_atomic_helper_check_modeset()
		551	* and then drm_atomic_helper_check_planes(). The assumption is that the
		552	* ->atomic_check functions depend upon an updated adjusted_mode.clock to
		553	* e.g. properly compute watermarks.
		554	*
		555	* RETURNS
		556	* Zero for success or -errno
		557	*/
		558	int drm_atomic_helper_check(struct drm_device *dev,
		559	struct drm_atomic_state *state)
		560	{
		561	int ret;
		562
		563	ret = drm_atomic_helper_check_modeset(dev, state);
		564	if (ret)
		565	return ret;
		566
		567	ret = drm_atomic_helper_check_planes(dev, state);
		568	if (ret)
		569	return ret;
		570
		571	return ret;
		572	}
		573	EXPORT_SYMBOL(drm_atomic_helper_check);
		574
		575	static void
		576	disable_outputs(struct drm_device dev, struct drm_atomic_state old_state)
		577	{
		578	struct drm_connector *connector;
		579	struct drm_connector_state *old_conn_state;
		580	struct drm_crtc *crtc;
		581	struct drm_crtc_state *old_crtc_state;
		582	int i;
		583
		584	for_each_connector_in_state(old_state, connector, old_conn_state, i) {
		585	const struct drm_encoder_helper_funcs *funcs;
		586	struct drm_encoder *encoder;
		587	struct drm_crtc_state *old_crtc_state;
		588
		589	/* Shut down everything that's in the changeset and currently
		590	* still on. So need to check the old, saved state. */
		591	if (!old_conn_state->crtc)
		592	continue;
		593
		594	old_crtc_state = old_state->crtc_states[drm_crtc_index(old_conn_state->crtc)];
		595
		596	if (!old_crtc_state->active \|\|
		597	!drm_atomic_crtc_needs_modeset(old_conn_state->crtc->state))
		598	continue;
		599
		600	encoder = old_conn_state->best_encoder;
		601
		602	/* We shouldn't get this far if we didn't previously have
		603	* an encoder.. but WARN_ON() rather than explode.
		604	*/
		605	if (WARN_ON(!encoder))
		606	continue;
		607
		608	funcs = encoder->helper_private;
		609
		610	DRM_DEBUG_ATOMIC("disabling [ENCODER:%d:%s]\n",
		611	encoder->base.id, encoder->name);
		612
		613	/*
		614	* Each encoder has at most one connector (since we always steal
		615	* it away), so we won't call disable hooks twice.
		616	*/
		617	drm_bridge_disable(encoder->bridge);
		618
		619	/* Right function depends upon target state. */
		620	if (connector->state->crtc && funcs->prepare)
		621	funcs->prepare(encoder);
		622	else if (funcs->disable)
		623	funcs->disable(encoder);
		624	else
		625	funcs->dpms(encoder, DRM_MODE_DPMS_OFF);
		626
		627	drm_bridge_post_disable(encoder->bridge);
		628	}
		629
		630	for_each_crtc_in_state(old_state, crtc, old_crtc_state, i) {
		631	const struct drm_crtc_helper_funcs *funcs;
		632
		633	/* Shut down everything that needs a full modeset. */
		634	if (!drm_atomic_crtc_needs_modeset(crtc->state))
		635	continue;
		636
		637	if (!old_crtc_state->active)
		638	continue;
		639
		640	funcs = crtc->helper_private;
		641
		642	DRM_DEBUG_ATOMIC("disabling [CRTC:%d]\n",
		643	crtc->base.id);
		644
		645
		646	/* Right function depends upon target state. */
		647	if (crtc->state->enable && funcs->prepare)
		648	funcs->prepare(crtc);
		649	else if (funcs->disable)
		650	funcs->disable(crtc);
		651	else
		652	funcs->dpms(crtc, DRM_MODE_DPMS_OFF);
		653	}
		654	}
		655
		656	/**
		657	* drm_atomic_helper_update_legacy_modeset_state - update legacy modeset state
		658	* @dev: DRM device
		659	* @old_state: atomic state object with old state structures
		660	*
		661	* This function updates all the various legacy modeset state pointers in
		662	* connectors, encoders and crtcs. It also updates the timestamping constants
		663	* used for precise vblank timestamps by calling
		664	* drm_calc_timestamping_constants().
		665	*
		666	* Drivers can use this for building their own atomic commit if they don't have
		667	* a pure helper-based modeset implementation.
		668	*/
		669	void
		670	drm_atomic_helper_update_legacy_modeset_state(struct drm_device *dev,
		671	struct drm_atomic_state *old_state)
		672	{
		673	struct drm_connector *connector;
		674	struct drm_connector_state *old_conn_state;
		675	struct drm_crtc *crtc;
		676	struct drm_crtc_state *old_crtc_state;
		677	int i;
		678
		679	/* clear out existing links and update dpms */
		680	for_each_connector_in_state(old_state, connector, old_conn_state, i) {
		681	if (connector->encoder) {
		682	WARN_ON(!connector->encoder->crtc);
		683
		684	connector->encoder->crtc = NULL;
		685	connector->encoder = NULL;
		686	}
		687
		688	crtc = connector->state->crtc;
		689	if ((!crtc && old_conn_state->crtc) \|\|
		690	(crtc && drm_atomic_crtc_needs_modeset(crtc->state))) {
		691	struct drm_property *dpms_prop =
		692	dev->mode_config.dpms_property;
		693	int mode = DRM_MODE_DPMS_OFF;
		694
		695	if (crtc && crtc->state->active)
		696	mode = DRM_MODE_DPMS_ON;
		697
		698	connector->dpms = mode;
		699	drm_object_property_set_value(&connector->base,
		700	dpms_prop, mode);
		701	}
		702	}
		703
		704	/* set new links */
		705	for_each_connector_in_state(old_state, connector, old_conn_state, i) {
		706	if (!connector->state->crtc)
		707	continue;
		708
		709	if (WARN_ON(!connector->state->best_encoder))
		710	continue;
		711
		712	connector->encoder = connector->state->best_encoder;
		713	connector->encoder->crtc = connector->state->crtc;
		714	}
		715
		716	/* set legacy state in the crtc structure */
		717	for_each_crtc_in_state(old_state, crtc, old_crtc_state, i) {
		718	struct drm_plane *primary = crtc->primary;
		719
		720	crtc->mode = crtc->state->mode;
		721	crtc->enabled = crtc->state->enable;
		722
		723	if (drm_atomic_get_existing_plane_state(old_state, primary) &&
		724	primary->state->crtc == crtc) {
		725	crtc->x = primary->state->src_x >> 16;
		726	crtc->y = primary->state->src_y >> 16;
		727	}
		728
		729	if (crtc->state->enable)
		730	drm_calc_timestamping_constants(crtc,
		731	&crtc->state->adjusted_mode);
		732	}
		733	}
		734	EXPORT_SYMBOL(drm_atomic_helper_update_legacy_modeset_state);
		735
		736	static void
		737	crtc_set_mode(struct drm_device dev, struct drm_atomic_state old_state)
		738	{
		739	struct drm_crtc *crtc;
		740	struct drm_crtc_state *old_crtc_state;
		741	struct drm_connector *connector;
		742	struct drm_connector_state *old_conn_state;
		743	int i;
		744
		745	for_each_crtc_in_state(old_state, crtc, old_crtc_state, i) {
		746	const struct drm_crtc_helper_funcs *funcs;
		747
		748	if (!crtc->state->mode_changed)
		749	continue;
		750
		751	funcs = crtc->helper_private;
		752
		753	if (crtc->state->enable && funcs->mode_set_nofb) {
		754	DRM_DEBUG_ATOMIC("modeset on [CRTC:%d]\n",
		755	crtc->base.id);
		756
		757	funcs->mode_set_nofb(crtc);
		758	}
		759	}
		760
		761	for_each_connector_in_state(old_state, connector, old_conn_state, i) {
		762	const struct drm_encoder_helper_funcs *funcs;
		763	struct drm_crtc_state *new_crtc_state;
		764	struct drm_encoder *encoder;
		765	struct drm_display_mode mode, adjusted_mode;
		766
		767	if (!connector->state->best_encoder)
		768	continue;
		769
		770	encoder = connector->state->best_encoder;
		771	funcs = encoder->helper_private;
		772	new_crtc_state = connector->state->crtc->state;
		773	mode = &new_crtc_state->mode;
		774	adjusted_mode = &new_crtc_state->adjusted_mode;
		775
		776	if (!new_crtc_state->mode_changed)
		777	continue;
		778
		779	DRM_DEBUG_ATOMIC("modeset on [ENCODER:%d:%s]\n",
		780	encoder->base.id, encoder->name);
		781
		782	/*
		783	* Each encoder has at most one connector (since we always steal
		784	* it away), so we won't call mode_set hooks twice.
		785	*/
		786	if (funcs->mode_set)
		787	funcs->mode_set(encoder, mode, adjusted_mode);
		788
		789	drm_bridge_mode_set(encoder->bridge, mode, adjusted_mode);
		790	}
		791	}
		792
		793	/**
		794	* drm_atomic_helper_commit_modeset_disables - modeset commit to disable outputs
		795	* @dev: DRM device
		796	* @old_state: atomic state object with old state structures
		797	*
		798	* This function shuts down all the outputs that need to be shut down and
		799	* prepares them (if required) with the new mode.
		800	*
		801	* For compatibility with legacy crtc helpers this should be called before
		802	* drm_atomic_helper_commit_planes(), which is what the default commit function
		803	* does. But drivers with different needs can group the modeset commits together
		804	* and do the plane commits at the end. This is useful for drivers doing runtime
		805	* PM since planes updates then only happen when the CRTC is actually enabled.
		806	*/
		807	void drm_atomic_helper_commit_modeset_disables(struct drm_device *dev,
		808	struct drm_atomic_state *old_state)
		809	{
		810	disable_outputs(dev, old_state);
		811
		812	drm_atomic_helper_update_legacy_modeset_state(dev, old_state);
		813
		814	crtc_set_mode(dev, old_state);
		815	}
		816	EXPORT_SYMBOL(drm_atomic_helper_commit_modeset_disables);
		817
		818	/**
		819	* drm_atomic_helper_commit_modeset_enables - modeset commit to enable outputs
		820	* @dev: DRM device
		821	* @old_state: atomic state object with old state structures
		822	*
		823	* This function enables all the outputs with the new configuration which had to
		824	* be turned off for the update.
		825	*
		826	* For compatibility with legacy crtc helpers this should be called after
		827	* drm_atomic_helper_commit_planes(), which is what the default commit function
		828	* does. But drivers with different needs can group the modeset commits together
		829	* and do the plane commits at the end. This is useful for drivers doing runtime
		830	* PM since planes updates then only happen when the CRTC is actually enabled.
		831	*/
		832	void drm_atomic_helper_commit_modeset_enables(struct drm_device *dev,
		833	struct drm_atomic_state *old_state)
		834	{
		835	struct drm_crtc *crtc;
		836	struct drm_crtc_state *old_crtc_state;
		837	struct drm_connector *connector;
		838	struct drm_connector_state *old_conn_state;
		839	int i;
		840
		841	for_each_crtc_in_state(old_state, crtc, old_crtc_state, i) {
		842	const struct drm_crtc_helper_funcs *funcs;
		843
		844	/* Need to filter out CRTCs where only planes change. */
		845	if (!drm_atomic_crtc_needs_modeset(crtc->state))
		846	continue;
		847
		848	if (!crtc->state->active)
		849	continue;
		850
		851	funcs = crtc->helper_private;
		852
		853	if (crtc->state->enable) {
		854	DRM_DEBUG_ATOMIC("enabling [CRTC:%d]\n",
		855	crtc->base.id);
		856
		857	if (funcs->enable)
		858	funcs->enable(crtc);
		859	else
		860	funcs->commit(crtc);
		861	}
		862	}
		863
		864	for_each_connector_in_state(old_state, connector, old_conn_state, i) {
		865	const struct drm_encoder_helper_funcs *funcs;
		866	struct drm_encoder *encoder;
		867
		868	if (!connector->state->best_encoder)
		869	continue;
		870
		871	if (!connector->state->crtc->state->active \|\|
		872	!drm_atomic_crtc_needs_modeset(connector->state->crtc->state))
		873	continue;
		874
		875	encoder = connector->state->best_encoder;
		876	funcs = encoder->helper_private;
		877
		878	DRM_DEBUG_ATOMIC("enabling [ENCODER:%d:%s]\n",
		879	encoder->base.id, encoder->name);
		880
		881	/*
		882	* Each encoder has at most one connector (since we always steal
		883	* it away), so we won't call enable hooks twice.
		884	*/
		885	drm_bridge_pre_enable(encoder->bridge);
		886
		887	if (funcs->enable)
		888	funcs->enable(encoder);
		889	else
		890	funcs->commit(encoder);
		891
		892	drm_bridge_enable(encoder->bridge);
		893	}
		894	}
		895	EXPORT_SYMBOL(drm_atomic_helper_commit_modeset_enables);
		896
		897	static void wait_for_fences(struct drm_device *dev,
		898	struct drm_atomic_state *state)
		899	{
		900	struct drm_plane *plane;
		901	struct drm_plane_state *plane_state;
		902	int i;
		903
		904	for_each_plane_in_state(state, plane, plane_state, i) {
		905	if (!plane->state->fence)
		906	continue;
		907
		908	WARN_ON(!plane->state->fb);
		909
		910	fence_wait(plane->state->fence, false);
		911	fence_put(plane->state->fence);
		912	plane->state->fence = NULL;
		913	}
		914	}
		915
		916	static bool framebuffer_changed(struct drm_device *dev,
		917	struct drm_atomic_state *old_state,
		918	struct drm_crtc *crtc)
		919	{
		920	struct drm_plane *plane;
		921	struct drm_plane_state *old_plane_state;
		922	int i;
		923
		924	for_each_plane_in_state(old_state, plane, old_plane_state, i) {
		925	if (plane->state->crtc != crtc &&
		926	old_plane_state->crtc != crtc)
		927	continue;
		928
		929	if (plane->state->fb != old_plane_state->fb)
		930	return true;
		931	}
		932
		933	return false;
		934	}
		935
		936	/**
		937	* drm_atomic_helper_wait_for_vblanks - wait for vblank on crtcs
		938	* @dev: DRM device
		939	* @old_state: atomic state object with old state structures
		940	*
		941	* Helper to, after atomic commit, wait for vblanks on all effected
		942	* crtcs (ie. before cleaning up old framebuffers using
		943	* drm_atomic_helper_cleanup_planes()). It will only wait on crtcs where the
		944	* framebuffers have actually changed to optimize for the legacy cursor and
		945	* plane update use-case.
		946	*/
		947	void
		948	drm_atomic_helper_wait_for_vblanks(struct drm_device *dev,
		949	struct drm_atomic_state *old_state)
		950	{
		951	struct drm_crtc *crtc;
		952	struct drm_crtc_state *old_crtc_state;
		953	int i, ret;
		954
		955	for_each_crtc_in_state(old_state, crtc, old_crtc_state, i) {
		956	/* No one cares about the old state, so abuse it for tracking
		957	* and store whether we hold a vblank reference (and should do a
		958	* vblank wait) in the ->enable boolean. */
		959	old_crtc_state->enable = false;
		960
		961	if (!crtc->state->enable)
		962	continue;
		963
		964	/* Legacy cursor ioctls are completely unsynced, and userspace
		965	* relies on that (by doing tons of cursor updates). */
		966	if (old_state->legacy_cursor_update)
		967	continue;
		968
		969	if (!framebuffer_changed(dev, old_state, crtc))
		970	continue;
		971
		972	ret = drm_crtc_vblank_get(crtc);
		973	if (ret != 0)
		974	continue;
		975
		976	old_crtc_state->enable = true;
		977	old_crtc_state->last_vblank_count = drm_crtc_vblank_count(crtc);
		978	}
		979
		980	for_each_crtc_in_state(old_state, crtc, old_crtc_state, i) {
		981	if (!old_crtc_state->enable)
		982	continue;
		983
		984	ret = wait_event_timeout(dev->vblank[i].queue,
		985	old_crtc_state->last_vblank_count !=
		986	drm_crtc_vblank_count(crtc),
		987	msecs_to_jiffies(50));
		988
		989	drm_crtc_vblank_put(crtc);
		990	}
		991	}
		992	EXPORT_SYMBOL(drm_atomic_helper_wait_for_vblanks);
		993
		994	/**
		995	* drm_atomic_helper_commit - commit validated state object
		996	* @dev: DRM device
		997	* @state: the driver state object
		998	* @async: asynchronous commit
		999	*
		1000	* This function commits a with drm_atomic_helper_check() pre-validated state
		1001	* object. This can still fail when e.g. the framebuffer reservation fails. For
		1002	* now this doesn't implement asynchronous commits.
		1003	*
		1004	* Note that right now this function does not support async commits, and hence
		1005	* driver writers must implement their own version for now. Also note that the
		1006	* default ordering of how the various stages are called is to match the legacy
		1007	* modeset helper library closest. One peculiarity of that is that it doesn't
		1008	* mesh well with runtime PM at all.
		1009	*
		1010	* For drivers supporting runtime PM the recommended sequence is
		1011	*
		1012	* drm_atomic_helper_commit_modeset_disables(dev, state);
		1013	*
		1014	* drm_atomic_helper_commit_modeset_enables(dev, state);
		1015	*
		1016	* drm_atomic_helper_commit_planes(dev, state, true);
		1017	*
		1018	* See the kerneldoc entries for these three functions for more details.
		1019	*
		1020	* RETURNS
		1021	* Zero for success or -errno.
		1022	*/
		1023	int drm_atomic_helper_commit(struct drm_device *dev,
		1024	struct drm_atomic_state *state,
		1025	bool async)
		1026	{
		1027	int ret;
		1028
		1029	if (async)
		1030	return -EBUSY;
		1031
		1032	ret = drm_atomic_helper_prepare_planes(dev, state);
		1033	if (ret)
		1034	return ret;
		1035
		1036	/*
		1037	* This is the point of no return - everything below never fails except
		1038	* when the hw goes bonghits. Which means we can commit the new state on
		1039	* the software side now.
		1040	*/
		1041
		1042	drm_atomic_helper_swap_state(dev, state);
		1043
		1044	/*
		1045	* Everything below can be run asynchronously without the need to grab
		1046	* any modeset locks at all under one condition: It must be guaranteed
		1047	* that the asynchronous work has either been cancelled (if the driver
		1048	* supports it, which at least requires that the framebuffers get
		1049	* cleaned up with drm_atomic_helper_cleanup_planes()) or completed
		1050	* before the new state gets committed on the software side with
		1051	* drm_atomic_helper_swap_state().
		1052	*
		1053	* This scheme allows new atomic state updates to be prepared and
		1054	* checked in parallel to the asynchronous completion of the previous
		1055	* update. Which is important since compositors need to figure out the
		1056	* composition of the next frame right after having submitted the
		1057	* current layout.
		1058	*/
		1059
		1060	wait_for_fences(dev, state);
		1061
		1062	drm_atomic_helper_commit_modeset_disables(dev, state);
		1063
		1064	drm_atomic_helper_commit_planes(dev, state, false);
		1065
		1066	drm_atomic_helper_commit_modeset_enables(dev, state);
		1067
6088	serge	1068	drm_atomic_helper_wait_for_vblanks(dev, state);
6084	serge	1069
		1070	drm_atomic_helper_cleanup_planes(dev, state);
		1071
		1072	drm_atomic_state_free(state);
		1073
		1074	return 0;
		1075	}
		1076	EXPORT_SYMBOL(drm_atomic_helper_commit);
		1077
		1078	/**
		1079	* DOC: implementing async commit
		1080	*
		1081	* For now the atomic helpers don't support async commit directly. If there is
		1082	* real need it could be added though, using the dma-buf fence infrastructure
		1083	* for generic synchronization with outstanding rendering.
		1084	*
		1085	* For now drivers have to implement async commit themselves, with the following
		1086	* sequence being the recommended one:
		1087	*
		1088	* 1. Run drm_atomic_helper_prepare_planes() first. This is the only function
		1089	* which commit needs to call which can fail, so we want to run it first and
		1090	* synchronously.
		1091	*
		1092	* 2. Synchronize with any outstanding asynchronous commit worker threads which
		1093	* might be affected the new state update. This can be done by either cancelling
		1094	* or flushing the work items, depending upon whether the driver can deal with
		1095	* cancelled updates. Note that it is important to ensure that the framebuffer
		1096	* cleanup is still done when cancelling.
		1097	*
		1098	* For sufficient parallelism it is recommended to have a work item per crtc
		1099	* (for updates which don't touch global state) and a global one. Then we only
		1100	* need to synchronize with the crtc work items for changed crtcs and the global
		1101	* work item, which allows nice concurrent updates on disjoint sets of crtcs.
		1102	*
		1103	* 3. The software state is updated synchronously with
		1104	* drm_atomic_helper_swap_state(). Doing this under the protection of all modeset
		1105	* locks means concurrent callers never see inconsistent state. And doing this
		1106	* while it's guaranteed that no relevant async worker runs means that async
		1107	* workers do not need grab any locks. Actually they must not grab locks, for
		1108	* otherwise the work flushing will deadlock.
		1109	*
		1110	* 4. Schedule a work item to do all subsequent steps, using the split-out
		1111	* commit helpers: a) pre-plane commit b) plane commit c) post-plane commit and
		1112	* then cleaning up the framebuffers after the old framebuffer is no longer
		1113	* being displayed.
		1114	*/
		1115
		1116	/**
		1117	* drm_atomic_helper_prepare_planes - prepare plane resources before commit
		1118	* @dev: DRM device
		1119	* @state: atomic state object with new state structures
		1120	*
		1121	* This function prepares plane state, specifically framebuffers, for the new
		1122	* configuration. If any failure is encountered this function will call
		1123	* ->cleanup_fb on any already successfully prepared framebuffer.
		1124	*
		1125	* Returns:
		1126	* 0 on success, negative error code on failure.
		1127	*/
		1128	int drm_atomic_helper_prepare_planes(struct drm_device *dev,
		1129	struct drm_atomic_state *state)
		1130	{
		1131	int nplanes = dev->mode_config.num_total_plane;
		1132	int ret, i;
		1133
		1134	for (i = 0; i < nplanes; i++) {
		1135	const struct drm_plane_helper_funcs *funcs;
		1136	struct drm_plane *plane = state->planes[i];
		1137	struct drm_plane_state *plane_state = state->plane_states[i];
		1138
		1139	if (!plane)
		1140	continue;
		1141
		1142	funcs = plane->helper_private;
		1143
		1144	if (funcs->prepare_fb) {
		1145	ret = funcs->prepare_fb(plane, plane_state);
		1146	if (ret)
		1147	goto fail;
		1148	}
		1149	}
		1150
		1151	return 0;
		1152
		1153	fail:
		1154	for (i--; i >= 0; i--) {
		1155	const struct drm_plane_helper_funcs *funcs;
		1156	struct drm_plane *plane = state->planes[i];
		1157	struct drm_plane_state *plane_state = state->plane_states[i];
		1158
		1159	if (!plane)
		1160	continue;
		1161
		1162	funcs = plane->helper_private;
		1163
		1164	if (funcs->cleanup_fb)
		1165	funcs->cleanup_fb(plane, plane_state);
		1166
		1167	}
		1168
		1169	return ret;
		1170	}
		1171	EXPORT_SYMBOL(drm_atomic_helper_prepare_planes);
		1172
		1173	bool plane_crtc_active(struct drm_plane_state *state)
		1174	{
		1175	return state->crtc && state->crtc->state->active;
		1176	}
		1177
		1178	/**
		1179	* drm_atomic_helper_commit_planes - commit plane state
		1180	* @dev: DRM device
		1181	* @old_state: atomic state object with old state structures
		1182	* @active_only: Only commit on active CRTC if set
		1183	*
		1184	* This function commits the new plane state using the plane and atomic helper
		1185	* functions for planes and crtcs. It assumes that the atomic state has already
		1186	* been pushed into the relevant object state pointers, since this step can no
		1187	* longer fail.
		1188	*
		1189	* It still requires the global state object @old_state to know which planes and
		1190	* crtcs need to be updated though.
		1191	*
		1192	* Note that this function does all plane updates across all CRTCs in one step.
		1193	* If the hardware can't support this approach look at
		1194	* drm_atomic_helper_commit_planes_on_crtc() instead.
		1195	*
		1196	* Plane parameters can be updated by applications while the associated CRTC is
		1197	* disabled. The DRM/KMS core will store the parameters in the plane state,
		1198	* which will be available to the driver when the CRTC is turned on. As a result
		1199	* most drivers don't need to be immediately notified of plane updates for a
		1200	* disabled CRTC.
		1201	*
		1202	* Unless otherwise needed, drivers are advised to set the @active_only
		1203	* parameters to true in order not to receive plane update notifications related
		1204	* to a disabled CRTC. This avoids the need to manually ignore plane updates in
		1205	* driver code when the driver and/or hardware can't or just don't need to deal
		1206	* with updates on disabled CRTCs, for example when supporting runtime PM.
		1207	*
		1208	* The drm_atomic_helper_commit() default implementation only sets @active_only
		1209	* to false to most closely match the behaviour of the legacy helpers. This should
		1210	* not be copied blindly by drivers.
		1211	*/
		1212	void drm_atomic_helper_commit_planes(struct drm_device *dev,
		1213	struct drm_atomic_state *old_state,
		1214	bool active_only)
		1215	{
		1216	struct drm_crtc *crtc;
		1217	struct drm_crtc_state *old_crtc_state;
		1218	struct drm_plane *plane;
		1219	struct drm_plane_state *old_plane_state;
		1220	int i;
		1221
		1222	for_each_crtc_in_state(old_state, crtc, old_crtc_state, i) {
		1223	const struct drm_crtc_helper_funcs *funcs;
		1224
		1225	funcs = crtc->helper_private;
		1226
		1227	if (!funcs \|\| !funcs->atomic_begin)
		1228	continue;
		1229
		1230	if (active_only && !crtc->state->active)
		1231	continue;
		1232
		1233	funcs->atomic_begin(crtc, old_crtc_state);
		1234	}
		1235
		1236	for_each_plane_in_state(old_state, plane, old_plane_state, i) {
		1237	const struct drm_plane_helper_funcs *funcs;
		1238	bool disabling;
		1239
		1240	funcs = plane->helper_private;
		1241
		1242	if (!funcs)
		1243	continue;
		1244
		1245	disabling = drm_atomic_plane_disabling(plane, old_plane_state);
		1246
		1247	if (active_only) {
		1248	/*
		1249	* Skip planes related to inactive CRTCs. If the plane
		1250	* is enabled use the state of the current CRTC. If the
		1251	* plane is being disabled use the state of the old
		1252	* CRTC to avoid skipping planes being disabled on an
		1253	* active CRTC.
		1254	*/
		1255	if (!disabling && !plane_crtc_active(plane->state))
		1256	continue;
		1257	if (disabling && !plane_crtc_active(old_plane_state))
		1258	continue;
		1259	}
		1260
		1261	/*
		1262	* Special-case disabling the plane if drivers support it.
		1263	*/
		1264	if (disabling && funcs->atomic_disable)
		1265	funcs->atomic_disable(plane, old_plane_state);
		1266	else if (plane->state->crtc \|\| disabling)
		1267	funcs->atomic_update(plane, old_plane_state);
		1268	}
		1269
		1270	for_each_crtc_in_state(old_state, crtc, old_crtc_state, i) {
		1271	const struct drm_crtc_helper_funcs *funcs;
		1272
		1273	funcs = crtc->helper_private;
		1274
		1275	if (!funcs \|\| !funcs->atomic_flush)
		1276	continue;
		1277
		1278	if (active_only && !crtc->state->active)
		1279	continue;
		1280
		1281	funcs->atomic_flush(crtc, old_crtc_state);
		1282	}
		1283	}
		1284	EXPORT_SYMBOL(drm_atomic_helper_commit_planes);
		1285
		1286	/**
		1287	* drm_atomic_helper_commit_planes_on_crtc - commit plane state for a crtc
		1288	* @old_crtc_state: atomic state object with the old crtc state
		1289	*
		1290	* This function commits the new plane state using the plane and atomic helper
		1291	* functions for planes on the specific crtc. It assumes that the atomic state
		1292	* has already been pushed into the relevant object state pointers, since this
		1293	* step can no longer fail.
		1294	*
		1295	* This function is useful when plane updates should be done crtc-by-crtc
		1296	* instead of one global step like drm_atomic_helper_commit_planes() does.
		1297	*
		1298	* This function can only be savely used when planes are not allowed to move
		1299	* between different CRTCs because this function doesn't handle inter-CRTC
		1300	* depencies. Callers need to ensure that either no such depencies exist,
		1301	* resolve them through ordering of commit calls or through some other means.
		1302	*/
		1303	void
		1304	drm_atomic_helper_commit_planes_on_crtc(struct drm_crtc_state *old_crtc_state)
		1305	{
		1306	const struct drm_crtc_helper_funcs *crtc_funcs;
		1307	struct drm_crtc *crtc = old_crtc_state->crtc;
		1308	struct drm_atomic_state *old_state = old_crtc_state->state;
		1309	struct drm_plane *plane;
		1310	unsigned plane_mask;
		1311
		1312	plane_mask = old_crtc_state->plane_mask;
		1313	plane_mask \|= crtc->state->plane_mask;
		1314
		1315	crtc_funcs = crtc->helper_private;
		1316	if (crtc_funcs && crtc_funcs->atomic_begin)
		1317	crtc_funcs->atomic_begin(crtc, old_crtc_state);
		1318
		1319	drm_for_each_plane_mask(plane, crtc->dev, plane_mask) {
		1320	struct drm_plane_state *old_plane_state =
		1321	drm_atomic_get_existing_plane_state(old_state, plane);
		1322	const struct drm_plane_helper_funcs *plane_funcs;
		1323
		1324	plane_funcs = plane->helper_private;
		1325
		1326	if (!old_plane_state \|\| !plane_funcs)
		1327	continue;
		1328
		1329	WARN_ON(plane->state->crtc && plane->state->crtc != crtc);
		1330
		1331	if (drm_atomic_plane_disabling(plane, old_plane_state) &&
		1332	plane_funcs->atomic_disable)
		1333	plane_funcs->atomic_disable(plane, old_plane_state);
		1334	else if (plane->state->crtc \|\|
		1335	drm_atomic_plane_disabling(plane, old_plane_state))
		1336	plane_funcs->atomic_update(plane, old_plane_state);
		1337	}
		1338
		1339	if (crtc_funcs && crtc_funcs->atomic_flush)
		1340	crtc_funcs->atomic_flush(crtc, old_crtc_state);
		1341	}
		1342	EXPORT_SYMBOL(drm_atomic_helper_commit_planes_on_crtc);
		1343
		1344	/**
		1345	* drm_atomic_helper_cleanup_planes - cleanup plane resources after commit
		1346	* @dev: DRM device
		1347	* @old_state: atomic state object with old state structures
		1348	*
		1349	* This function cleans up plane state, specifically framebuffers, from the old
		1350	* configuration. Hence the old configuration must be perserved in @old_state to
		1351	* be able to call this function.
		1352	*
		1353	* This function must also be called on the new state when the atomic update
		1354	* fails at any point after calling drm_atomic_helper_prepare_planes().
		1355	*/
		1356	void drm_atomic_helper_cleanup_planes(struct drm_device *dev,
		1357	struct drm_atomic_state *old_state)
		1358	{
		1359	struct drm_plane *plane;
		1360	struct drm_plane_state *plane_state;
		1361	int i;
		1362
		1363	for_each_plane_in_state(old_state, plane, plane_state, i) {
		1364	const struct drm_plane_helper_funcs *funcs;
		1365
		1366	funcs = plane->helper_private;
		1367
		1368	if (funcs->cleanup_fb)
		1369	funcs->cleanup_fb(plane, plane_state);
		1370	}
		1371	}
		1372	EXPORT_SYMBOL(drm_atomic_helper_cleanup_planes);
		1373
		1374	/**
		1375	* drm_atomic_helper_swap_state - store atomic state into current sw state
		1376	* @dev: DRM device
		1377	* @state: atomic state
		1378	*
		1379	* This function stores the atomic state into the current state pointers in all
		1380	* driver objects. It should be called after all failing steps have been done
		1381	* and succeeded, but before the actual hardware state is committed.
		1382	*
		1383	* For cleanup and error recovery the current state for all changed objects will
		1384	* be swaped into @state.
		1385	*
		1386	* With that sequence it fits perfectly into the plane prepare/cleanup sequence:
		1387	*
		1388	* 1. Call drm_atomic_helper_prepare_planes() with the staged atomic state.
		1389	*
		1390	* 2. Do any other steps that might fail.
		1391	*
		1392	* 3. Put the staged state into the current state pointers with this function.
		1393	*
		1394	* 4. Actually commit the hardware state.
		1395	*
		1396	* 5. Call drm_atomic_helper_cleanup_planes() with @state, which since step 3
		1397	* contains the old state. Also do any other cleanup required with that state.
		1398	*/
		1399	void drm_atomic_helper_swap_state(struct drm_device *dev,
		1400	struct drm_atomic_state *state)
		1401	{
		1402	int i;
		1403
		1404	for (i = 0; i < dev->mode_config.num_connector; i++) {
		1405	struct drm_connector *connector = state->connectors[i];
		1406
		1407	if (!connector)
		1408	continue;
		1409
		1410	connector->state->state = state;
		1411	swap(state->connector_states[i], connector->state);
		1412	connector->state->state = NULL;
		1413	}
		1414
		1415	for (i = 0; i < dev->mode_config.num_crtc; i++) {
		1416	struct drm_crtc *crtc = state->crtcs[i];
		1417
		1418	if (!crtc)
		1419	continue;
		1420
		1421	crtc->state->state = state;
		1422	swap(state->crtc_states[i], crtc->state);
		1423	crtc->state->state = NULL;
		1424	}
		1425
		1426	for (i = 0; i < dev->mode_config.num_total_plane; i++) {
		1427	struct drm_plane *plane = state->planes[i];
		1428
		1429	if (!plane)
		1430	continue;
		1431
		1432	plane->state->state = state;
		1433	swap(state->plane_states[i], plane->state);
		1434	plane->state->state = NULL;
		1435	}
		1436	}
		1437	EXPORT_SYMBOL(drm_atomic_helper_swap_state);
		1438
		1439	/**
		1440	* drm_atomic_helper_update_plane - Helper for primary plane update using atomic
		1441	* @plane: plane object to update
		1442	* @crtc: owning CRTC of owning plane
		1443	* @fb: framebuffer to flip onto plane
		1444	* @crtc_x: x offset of primary plane on crtc
		1445	* @crtc_y: y offset of primary plane on crtc
		1446	* @crtc_w: width of primary plane rectangle on crtc
		1447	* @crtc_h: height of primary plane rectangle on crtc
		1448	* @src_x: x offset of @fb for panning
		1449	* @src_y: y offset of @fb for panning
		1450	* @src_w: width of source rectangle in @fb
		1451	* @src_h: height of source rectangle in @fb
		1452	*
		1453	* Provides a default plane update handler using the atomic driver interface.
		1454	*
		1455	* RETURNS:
		1456	* Zero on success, error code on failure
		1457	*/
		1458	int drm_atomic_helper_update_plane(struct drm_plane *plane,
		1459	struct drm_crtc *crtc,
		1460	struct drm_framebuffer *fb,
		1461	int crtc_x, int crtc_y,
		1462	unsigned int crtc_w, unsigned int crtc_h,
		1463	uint32_t src_x, uint32_t src_y,
		1464	uint32_t src_w, uint32_t src_h)
		1465	{
		1466	struct drm_atomic_state *state;
		1467	struct drm_plane_state *plane_state;
		1468	int ret = 0;
		1469
		1470	state = drm_atomic_state_alloc(plane->dev);
		1471	if (!state)
		1472	return -ENOMEM;
		1473
		1474	state->acquire_ctx = drm_modeset_legacy_acquire_ctx(crtc);
		1475	retry:
		1476	plane_state = drm_atomic_get_plane_state(state, plane);
		1477	if (IS_ERR(plane_state)) {
		1478	ret = PTR_ERR(plane_state);
		1479	goto fail;
		1480	}
		1481
		1482	ret = drm_atomic_set_crtc_for_plane(plane_state, crtc);
		1483	if (ret != 0)
		1484	goto fail;
		1485	drm_atomic_set_fb_for_plane(plane_state, fb);
		1486	plane_state->crtc_x = crtc_x;
		1487	plane_state->crtc_y = crtc_y;
		1488	plane_state->crtc_h = crtc_h;
		1489	plane_state->crtc_w = crtc_w;
		1490	plane_state->src_x = src_x;
		1491	plane_state->src_y = src_y;
		1492	plane_state->src_h = src_h;
		1493	plane_state->src_w = src_w;
		1494
		1495	if (plane == crtc->cursor)
		1496	state->legacy_cursor_update = true;
		1497
		1498	ret = drm_atomic_commit(state);
		1499	if (ret != 0)
		1500	goto fail;
		1501
		1502	/* Driver takes ownership of state on successful commit. */
		1503	return 0;
		1504	fail:
		1505	if (ret == -EDEADLK)
		1506	goto backoff;
		1507
		1508	drm_atomic_state_free(state);
		1509
		1510	return ret;
		1511	backoff:
		1512	drm_atomic_state_clear(state);
		1513	drm_atomic_legacy_backoff(state);
		1514
		1515	/*
		1516	* Someone might have exchanged the framebuffer while we dropped locks
		1517	* in the backoff code. We need to fix up the fb refcount tracking the
		1518	* core does for us.
		1519	*/
		1520	plane->old_fb = plane->fb;
		1521
		1522	goto retry;
		1523	}
		1524	EXPORT_SYMBOL(drm_atomic_helper_update_plane);
		1525
		1526	/**
		1527	* drm_atomic_helper_disable_plane - Helper for primary plane disable using * atomic
		1528	* @plane: plane to disable
		1529	*
		1530	* Provides a default plane disable handler using the atomic driver interface.
		1531	*
		1532	* RETURNS:
		1533	* Zero on success, error code on failure
		1534	*/
		1535	int drm_atomic_helper_disable_plane(struct drm_plane *plane)
		1536	{
		1537	struct drm_atomic_state *state;
		1538	struct drm_plane_state *plane_state;
		1539	int ret = 0;
		1540
		1541	/*
		1542	* FIXME: Without plane->crtc set we can't get at the implicit legacy
		1543	* acquire context. The real fix will be to wire the acquire ctx through
		1544	* everywhere we need it, but meanwhile prevent chaos by just skipping
		1545	* this noop. The critical case is the cursor ioctls which a) only grab
		1546	* crtc/cursor-plane locks (so we need the crtc to get at the right
		1547	* acquire context) and b) can try to disable the plane multiple times.
		1548	*/
		1549	if (!plane->crtc)
		1550	return 0;
		1551
		1552	state = drm_atomic_state_alloc(plane->dev);
		1553	if (!state)
		1554	return -ENOMEM;
		1555
		1556	state->acquire_ctx = drm_modeset_legacy_acquire_ctx(plane->crtc);
		1557	retry:
		1558	plane_state = drm_atomic_get_plane_state(state, plane);
		1559	if (IS_ERR(plane_state)) {
		1560	ret = PTR_ERR(plane_state);
		1561	goto fail;
		1562	}
		1563
		1564	if (plane_state->crtc && (plane == plane->crtc->cursor))
		1565	plane_state->state->legacy_cursor_update = true;
		1566
		1567	ret = __drm_atomic_helper_disable_plane(plane, plane_state);
		1568	if (ret != 0)
		1569	goto fail;
		1570
		1571	ret = drm_atomic_commit(state);
		1572	if (ret != 0)
		1573	goto fail;
		1574
		1575	/* Driver takes ownership of state on successful commit. */
		1576	return 0;
		1577	fail:
		1578	if (ret == -EDEADLK)
		1579	goto backoff;
		1580
		1581	drm_atomic_state_free(state);
		1582
		1583	return ret;
		1584	backoff:
		1585	drm_atomic_state_clear(state);
		1586	drm_atomic_legacy_backoff(state);
		1587
		1588	/*
		1589	* Someone might have exchanged the framebuffer while we dropped locks
		1590	* in the backoff code. We need to fix up the fb refcount tracking the
		1591	* core does for us.
		1592	*/
		1593	plane->old_fb = plane->fb;
		1594
		1595	goto retry;
		1596	}
		1597	EXPORT_SYMBOL(drm_atomic_helper_disable_plane);
		1598
		1599	/* just used from fb-helper and atomic-helper: */
		1600	int __drm_atomic_helper_disable_plane(struct drm_plane *plane,
		1601	struct drm_plane_state *plane_state)
		1602	{
		1603	int ret;
		1604
		1605	ret = drm_atomic_set_crtc_for_plane(plane_state, NULL);
		1606	if (ret != 0)
		1607	return ret;
		1608
		1609	drm_atomic_set_fb_for_plane(plane_state, NULL);
		1610	plane_state->crtc_x = 0;
		1611	plane_state->crtc_y = 0;
		1612	plane_state->crtc_h = 0;
		1613	plane_state->crtc_w = 0;
		1614	plane_state->src_x = 0;
		1615	plane_state->src_y = 0;
		1616	plane_state->src_h = 0;
		1617	plane_state->src_w = 0;
		1618
		1619	return 0;
		1620	}
		1621
		1622	static int update_output_state(struct drm_atomic_state *state,
		1623	struct drm_mode_set *set)
		1624	{
		1625	struct drm_device *dev = set->crtc->dev;
		1626	struct drm_crtc *crtc;
		1627	struct drm_crtc_state *crtc_state;
		1628	struct drm_connector *connector;
		1629	struct drm_connector_state *conn_state;
		1630	int ret, i, j;
		1631
		1632	ret = drm_modeset_lock(&dev->mode_config.connection_mutex,
		1633	state->acquire_ctx);
		1634	if (ret)
		1635	return ret;
		1636
		1637	/* First grab all affected connector/crtc states. */
		1638	for (i = 0; i < set->num_connectors; i++) {
		1639	conn_state = drm_atomic_get_connector_state(state,
		1640	set->connectors[i]);
		1641	if (IS_ERR(conn_state))
		1642	return PTR_ERR(conn_state);
		1643	}
		1644
		1645	for_each_crtc_in_state(state, crtc, crtc_state, i) {
		1646	ret = drm_atomic_add_affected_connectors(state, crtc);
		1647	if (ret)
		1648	return ret;
		1649	}
		1650
		1651	/* Then recompute connector->crtc links and crtc enabling state. */
		1652	for_each_connector_in_state(state, connector, conn_state, i) {
		1653	if (conn_state->crtc == set->crtc) {
		1654	ret = drm_atomic_set_crtc_for_connector(conn_state,
		1655	NULL);
		1656	if (ret)
		1657	return ret;
		1658	}
		1659
		1660	for (j = 0; j < set->num_connectors; j++) {
		1661	if (set->connectors[j] == connector) {
		1662	ret = drm_atomic_set_crtc_for_connector(conn_state,
		1663	set->crtc);
		1664	if (ret)
		1665	return ret;
		1666	break;
		1667	}
		1668	}
		1669	}
		1670
		1671	for_each_crtc_in_state(state, crtc, crtc_state, i) {
		1672	/* Don't update ->enable for the CRTC in the set_config request,
		1673	* since a mismatch would indicate a bug in the upper layers.
		1674	* The actual modeset code later on will catch any
		1675	* inconsistencies here. */
		1676	if (crtc == set->crtc)
		1677	continue;
		1678
		1679	if (!drm_atomic_connectors_for_crtc(state, crtc)) {
		1680	ret = drm_atomic_set_mode_prop_for_crtc(crtc_state,
		1681	NULL);
		1682	if (ret < 0)
		1683	return ret;
		1684
		1685	crtc_state->active = false;
		1686	}
		1687	}
		1688
		1689	return 0;
		1690	}
		1691
		1692	/**
		1693	* drm_atomic_helper_set_config - set a new config from userspace
		1694	* @set: mode set configuration
		1695	*
		1696	* Provides a default crtc set_config handler using the atomic driver interface.
		1697	*
		1698	* Returns:
		1699	* Returns 0 on success, negative errno numbers on failure.
		1700	*/
		1701	int drm_atomic_helper_set_config(struct drm_mode_set *set)
		1702	{
		1703	struct drm_atomic_state *state;
		1704	struct drm_crtc *crtc = set->crtc;
		1705	int ret = 0;
		1706
		1707	state = drm_atomic_state_alloc(crtc->dev);
		1708	if (!state)
		1709	return -ENOMEM;
		1710
		1711	state->acquire_ctx = drm_modeset_legacy_acquire_ctx(crtc);
		1712	retry:
		1713	ret = __drm_atomic_helper_set_config(set, state);
		1714	if (ret != 0)
		1715	goto fail;
		1716
		1717	ret = drm_atomic_commit(state);
		1718	if (ret != 0)
		1719	goto fail;
		1720
		1721	/* Driver takes ownership of state on successful commit. */
		1722	return 0;
		1723	fail:
		1724	if (ret == -EDEADLK)
		1725	goto backoff;
		1726
		1727	drm_atomic_state_free(state);
		1728
		1729	return ret;
		1730	backoff:
		1731	drm_atomic_state_clear(state);
		1732	drm_atomic_legacy_backoff(state);
		1733
		1734	/*
		1735	* Someone might have exchanged the framebuffer while we dropped locks
		1736	* in the backoff code. We need to fix up the fb refcount tracking the
		1737	* core does for us.
		1738	*/
		1739	crtc->primary->old_fb = crtc->primary->fb;
		1740
		1741	goto retry;
		1742	}
		1743	EXPORT_SYMBOL(drm_atomic_helper_set_config);
		1744
		1745	/* just used from fb-helper and atomic-helper: */
		1746	int __drm_atomic_helper_set_config(struct drm_mode_set *set,
		1747	struct drm_atomic_state *state)
		1748	{
		1749	struct drm_crtc_state *crtc_state;
		1750	struct drm_plane_state *primary_state;
		1751	struct drm_crtc *crtc = set->crtc;
		1752	int hdisplay, vdisplay;
		1753	int ret;
		1754
		1755	crtc_state = drm_atomic_get_crtc_state(state, crtc);
		1756	if (IS_ERR(crtc_state))
		1757	return PTR_ERR(crtc_state);
		1758
		1759	primary_state = drm_atomic_get_plane_state(state, crtc->primary);
		1760	if (IS_ERR(primary_state))
		1761	return PTR_ERR(primary_state);
		1762
		1763	if (!set->mode) {
		1764	WARN_ON(set->fb);
		1765	WARN_ON(set->num_connectors);
		1766
		1767	ret = drm_atomic_set_mode_for_crtc(crtc_state, NULL);
		1768	if (ret != 0)
		1769	return ret;
		1770
		1771	crtc_state->active = false;
		1772
		1773	ret = drm_atomic_set_crtc_for_plane(primary_state, NULL);
		1774	if (ret != 0)
		1775	return ret;
		1776
		1777	drm_atomic_set_fb_for_plane(primary_state, NULL);
		1778
		1779	goto commit;
		1780	}
		1781
		1782	WARN_ON(!set->fb);
		1783	WARN_ON(!set->num_connectors);
		1784
		1785	ret = drm_atomic_set_mode_for_crtc(crtc_state, set->mode);
		1786	if (ret != 0)
		1787	return ret;
		1788
		1789	crtc_state->active = true;
		1790
		1791	ret = drm_atomic_set_crtc_for_plane(primary_state, crtc);
		1792	if (ret != 0)
		1793	return ret;
		1794
		1795	drm_crtc_get_hv_timing(set->mode, &hdisplay, &vdisplay);
		1796
		1797	drm_atomic_set_fb_for_plane(primary_state, set->fb);
		1798	primary_state->crtc_x = 0;
		1799	primary_state->crtc_y = 0;
		1800	primary_state->crtc_h = vdisplay;
		1801	primary_state->crtc_w = hdisplay;
		1802	primary_state->src_x = set->x << 16;
		1803	primary_state->src_y = set->y << 16;
		1804	if (primary_state->rotation & (BIT(DRM_ROTATE_90) \| BIT(DRM_ROTATE_270))) {
		1805	primary_state->src_h = hdisplay << 16;
		1806	primary_state->src_w = vdisplay << 16;
		1807	} else {
		1808	primary_state->src_h = vdisplay << 16;
		1809	primary_state->src_w = hdisplay << 16;
		1810	}
		1811
		1812	commit:
		1813	ret = update_output_state(state, set);
		1814	if (ret)
		1815	return ret;
		1816
		1817	return 0;
		1818	}
		1819
		1820	/**
		1821	* drm_atomic_helper_crtc_set_property - helper for crtc properties
		1822	* @crtc: DRM crtc
		1823	* @property: DRM property
		1824	* @val: value of property
		1825	*
		1826	* Provides a default crtc set_property handler using the atomic driver
		1827	* interface.
		1828	*
		1829	* RETURNS:
		1830	* Zero on success, error code on failure
		1831	*/
		1832	int
		1833	drm_atomic_helper_crtc_set_property(struct drm_crtc *crtc,
		1834	struct drm_property *property,
		1835	uint64_t val)
		1836	{
		1837	struct drm_atomic_state *state;
		1838	struct drm_crtc_state *crtc_state;
		1839	int ret = 0;
		1840
		1841	state = drm_atomic_state_alloc(crtc->dev);
		1842	if (!state)
		1843	return -ENOMEM;
		1844
		1845	/* ->set_property is always called with all locks held. */
		1846	state->acquire_ctx = crtc->dev->mode_config.acquire_ctx;
		1847	retry:
		1848	crtc_state = drm_atomic_get_crtc_state(state, crtc);
		1849	if (IS_ERR(crtc_state)) {
		1850	ret = PTR_ERR(crtc_state);
		1851	goto fail;
		1852	}
		1853
		1854	ret = drm_atomic_crtc_set_property(crtc, crtc_state,
		1855	property, val);
		1856	if (ret)
		1857	goto fail;
		1858
		1859	ret = drm_atomic_commit(state);
		1860	if (ret != 0)
		1861	goto fail;
		1862
		1863	/* Driver takes ownership of state on successful commit. */
		1864	return 0;
		1865	fail:
		1866	if (ret == -EDEADLK)
		1867	goto backoff;
		1868
		1869	drm_atomic_state_free(state);
		1870
		1871	return ret;
		1872	backoff:
		1873	drm_atomic_state_clear(state);
		1874	drm_atomic_legacy_backoff(state);
		1875
		1876	goto retry;
		1877	}
		1878	EXPORT_SYMBOL(drm_atomic_helper_crtc_set_property);
		1879
		1880	/**
		1881	* drm_atomic_helper_plane_set_property - helper for plane properties
		1882	* @plane: DRM plane
		1883	* @property: DRM property
		1884	* @val: value of property
		1885	*
		1886	* Provides a default plane set_property handler using the atomic driver
		1887	* interface.
		1888	*
		1889	* RETURNS:
		1890	* Zero on success, error code on failure
		1891	*/
		1892	int
		1893	drm_atomic_helper_plane_set_property(struct drm_plane *plane,
		1894	struct drm_property *property,
		1895	uint64_t val)
		1896	{
		1897	struct drm_atomic_state *state;
		1898	struct drm_plane_state *plane_state;
		1899	int ret = 0;
		1900
		1901	state = drm_atomic_state_alloc(plane->dev);
		1902	if (!state)
		1903	return -ENOMEM;
		1904
		1905	/* ->set_property is always called with all locks held. */
		1906	state->acquire_ctx = plane->dev->mode_config.acquire_ctx;
		1907	retry:
		1908	plane_state = drm_atomic_get_plane_state(state, plane);
		1909	if (IS_ERR(plane_state)) {
		1910	ret = PTR_ERR(plane_state);
		1911	goto fail;
		1912	}
		1913
		1914	ret = drm_atomic_plane_set_property(plane, plane_state,
		1915	property, val);
		1916	if (ret)
		1917	goto fail;
		1918
		1919	ret = drm_atomic_commit(state);
		1920	if (ret != 0)
		1921	goto fail;
		1922
		1923	/* Driver takes ownership of state on successful commit. */
		1924	return 0;
		1925	fail:
		1926	if (ret == -EDEADLK)
		1927	goto backoff;
		1928
		1929	drm_atomic_state_free(state);
		1930
		1931	return ret;
		1932	backoff:
		1933	drm_atomic_state_clear(state);
		1934	drm_atomic_legacy_backoff(state);
		1935
		1936	goto retry;
		1937	}
		1938	EXPORT_SYMBOL(drm_atomic_helper_plane_set_property);
		1939
		1940	/**
		1941	* drm_atomic_helper_connector_set_property - helper for connector properties
		1942	* @connector: DRM connector
		1943	* @property: DRM property
		1944	* @val: value of property
		1945	*
		1946	* Provides a default connector set_property handler using the atomic driver
		1947	* interface.
		1948	*
		1949	* RETURNS:
		1950	* Zero on success, error code on failure
		1951	*/
		1952	int
		1953	drm_atomic_helper_connector_set_property(struct drm_connector *connector,
		1954	struct drm_property *property,
		1955	uint64_t val)
		1956	{
		1957	struct drm_atomic_state *state;
		1958	struct drm_connector_state *connector_state;
		1959	int ret = 0;
		1960
		1961	state = drm_atomic_state_alloc(connector->dev);
		1962	if (!state)
		1963	return -ENOMEM;
		1964
		1965	/* ->set_property is always called with all locks held. */
		1966	state->acquire_ctx = connector->dev->mode_config.acquire_ctx;
		1967	retry:
		1968	connector_state = drm_atomic_get_connector_state(state, connector);
		1969	if (IS_ERR(connector_state)) {
		1970	ret = PTR_ERR(connector_state);
		1971	goto fail;
		1972	}
		1973
		1974	ret = drm_atomic_connector_set_property(connector, connector_state,
		1975	property, val);
		1976	if (ret)
		1977	goto fail;
		1978
		1979	ret = drm_atomic_commit(state);
		1980	if (ret != 0)
		1981	goto fail;
		1982
		1983	/* Driver takes ownership of state on successful commit. */
		1984	return 0;
		1985	fail:
		1986	if (ret == -EDEADLK)
		1987	goto backoff;
		1988
		1989	drm_atomic_state_free(state);
		1990
		1991	return ret;
		1992	backoff:
		1993	drm_atomic_state_clear(state);
		1994	drm_atomic_legacy_backoff(state);
		1995
		1996	goto retry;
		1997	}
		1998	EXPORT_SYMBOL(drm_atomic_helper_connector_set_property);
		1999
		2000	/**
		2001	* drm_atomic_helper_page_flip - execute a legacy page flip
		2002	* @crtc: DRM crtc
		2003	* @fb: DRM framebuffer
		2004	* @event: optional DRM event to signal upon completion
		2005	* @flags: flip flags for non-vblank sync'ed updates
		2006	*
		2007	* Provides a default page flip implementation using the atomic driver interface.
		2008	*
		2009	* Note that for now so called async page flips (i.e. updates which are not
		2010	* synchronized to vblank) are not supported, since the atomic interfaces have
		2011	* no provisions for this yet.
		2012	*
		2013	* Returns:
		2014	* Returns 0 on success, negative errno numbers on failure.
		2015	*/
		2016	int drm_atomic_helper_page_flip(struct drm_crtc *crtc,
		2017	struct drm_framebuffer *fb,
		2018	struct drm_pending_vblank_event *event,
		2019	uint32_t flags)
		2020	{
		2021	struct drm_plane *plane = crtc->primary;
		2022	struct drm_atomic_state *state;
		2023	struct drm_plane_state *plane_state;
		2024	struct drm_crtc_state *crtc_state;
		2025	int ret = 0;
		2026
		2027	if (flags & DRM_MODE_PAGE_FLIP_ASYNC)
		2028	return -EINVAL;
		2029
		2030	state = drm_atomic_state_alloc(plane->dev);
		2031	if (!state)
		2032	return -ENOMEM;
		2033
		2034	state->acquire_ctx = drm_modeset_legacy_acquire_ctx(crtc);
		2035	retry:
		2036	crtc_state = drm_atomic_get_crtc_state(state, crtc);
		2037	if (IS_ERR(crtc_state)) {
		2038	ret = PTR_ERR(crtc_state);
		2039	goto fail;
		2040	}
		2041	crtc_state->event = event;
		2042
		2043	plane_state = drm_atomic_get_plane_state(state, plane);
		2044	if (IS_ERR(plane_state)) {
		2045	ret = PTR_ERR(plane_state);
		2046	goto fail;
		2047	}
		2048
		2049	ret = drm_atomic_set_crtc_for_plane(plane_state, crtc);
		2050	if (ret != 0)
		2051	goto fail;
		2052	drm_atomic_set_fb_for_plane(plane_state, fb);
		2053
		2054	ret = drm_atomic_async_commit(state);
		2055	if (ret != 0)
		2056	goto fail;
		2057
		2058	/* Driver takes ownership of state on successful async commit. */
		2059	return 0;
		2060	fail:
		2061	if (ret == -EDEADLK)
		2062	goto backoff;
		2063
		2064	drm_atomic_state_free(state);
		2065
		2066	return ret;
		2067	backoff:
		2068	drm_atomic_state_clear(state);
		2069	drm_atomic_legacy_backoff(state);
		2070
		2071	/*
		2072	* Someone might have exchanged the framebuffer while we dropped locks
		2073	* in the backoff code. We need to fix up the fb refcount tracking the
		2074	* core does for us.
		2075	*/
		2076	plane->old_fb = plane->fb;
		2077
		2078	goto retry;
		2079	}
		2080	EXPORT_SYMBOL(drm_atomic_helper_page_flip);
		2081
		2082	/**
		2083	* drm_atomic_helper_connector_dpms() - connector dpms helper implementation
		2084	* @connector: affected connector
		2085	* @mode: DPMS mode
		2086	*
		2087	* This is the main helper function provided by the atomic helper framework for
		2088	* implementing the legacy DPMS connector interface. It computes the new desired
		2089	* ->active state for the corresponding CRTC (if the connector is enabled) and
		2090	* updates it.
		2091	*
		2092	* Returns:
		2093	* Returns 0 on success, negative errno numbers on failure.
		2094	*/
		2095	int drm_atomic_helper_connector_dpms(struct drm_connector *connector,
		2096	int mode)
		2097	{
		2098	struct drm_mode_config *config = &connector->dev->mode_config;
		2099	struct drm_atomic_state *state;
		2100	struct drm_crtc_state *crtc_state;
		2101	struct drm_crtc *crtc;
		2102	struct drm_connector *tmp_connector;
		2103	int ret;
		2104	bool active = false;
		2105	int old_mode = connector->dpms;
		2106
		2107	if (mode != DRM_MODE_DPMS_ON)
		2108	mode = DRM_MODE_DPMS_OFF;
		2109
		2110	connector->dpms = mode;
		2111	crtc = connector->state->crtc;
		2112
		2113	if (!crtc)
		2114	return 0;
		2115
		2116	state = drm_atomic_state_alloc(connector->dev);
		2117	if (!state)
		2118	return -ENOMEM;
		2119
		2120	state->acquire_ctx = drm_modeset_legacy_acquire_ctx(crtc);
		2121	retry:
		2122	crtc_state = drm_atomic_get_crtc_state(state, crtc);
		2123	if (IS_ERR(crtc_state)) {
		2124	ret = PTR_ERR(crtc_state);
		2125	goto fail;
		2126	}
		2127
		2128	WARN_ON(!drm_modeset_is_locked(&config->connection_mutex));
		2129
		2130	drm_for_each_connector(tmp_connector, connector->dev) {
		2131	if (tmp_connector->state->crtc != crtc)
		2132	continue;
		2133
		2134	if (tmp_connector->dpms == DRM_MODE_DPMS_ON) {
		2135	active = true;
		2136	break;
		2137	}
		2138	}
		2139	crtc_state->active = active;
		2140
		2141	ret = drm_atomic_commit(state);
		2142	if (ret != 0)
		2143	goto fail;
		2144
		2145	/* Driver takes ownership of state on successful commit. */
		2146	return 0;
		2147	fail:
		2148	if (ret == -EDEADLK)
		2149	goto backoff;
		2150
		2151	connector->dpms = old_mode;
		2152	drm_atomic_state_free(state);
		2153
		2154	return ret;
		2155	backoff:
		2156	drm_atomic_state_clear(state);
		2157	drm_atomic_legacy_backoff(state);
		2158
		2159	goto retry;
		2160	}
		2161	EXPORT_SYMBOL(drm_atomic_helper_connector_dpms);
		2162
		2163	/**
		2164	* DOC: atomic state reset and initialization
		2165	*
		2166	* Both the drm core and the atomic helpers assume that there is always the full
		2167	* and correct atomic software state for all connectors, CRTCs and planes
		2168	* available. Which is a bit a problem on driver load and also after system
		2169	* suspend. One way to solve this is to have a hardware state read-out
		2170	* infrastructure which reconstructs the full software state (e.g. the i915
		2171	* driver).
		2172	*
		2173	* The simpler solution is to just reset the software state to everything off,
		2174	* which is easiest to do by calling drm_mode_config_reset(). To facilitate this
		2175	* the atomic helpers provide default reset implementations for all hooks.
		2176	*/
		2177
		2178	/**
		2179	* drm_atomic_helper_crtc_reset - default ->reset hook for CRTCs
		2180	* @crtc: drm CRTC
		2181	*
		2182	* Resets the atomic state for @crtc by freeing the state pointer (which might
		2183	* be NULL, e.g. at driver load time) and allocating a new empty state object.
		2184	*/
		2185	void drm_atomic_helper_crtc_reset(struct drm_crtc *crtc)
		2186	{
		2187	if (crtc->state && crtc->state->mode_blob)
		2188	drm_property_unreference_blob(crtc->state->mode_blob);
		2189	kfree(crtc->state);
		2190	crtc->state = kzalloc(sizeof(*crtc->state), GFP_KERNEL);
		2191
		2192	if (crtc->state)
		2193	crtc->state->crtc = crtc;
		2194	}
		2195	EXPORT_SYMBOL(drm_atomic_helper_crtc_reset);
		2196
		2197	/**
		2198	* __drm_atomic_helper_crtc_duplicate_state - copy atomic CRTC state
		2199	* @crtc: CRTC object
		2200	* @state: atomic CRTC state
		2201	*
		2202	* Copies atomic state from a CRTC's current state and resets inferred values.
		2203	* This is useful for drivers that subclass the CRTC state.
		2204	*/
		2205	void __drm_atomic_helper_crtc_duplicate_state(struct drm_crtc *crtc,
		2206	struct drm_crtc_state *state)
		2207	{
		2208	memcpy(state, crtc->state, sizeof(*state));
		2209
		2210	if (state->mode_blob)
		2211	drm_property_reference_blob(state->mode_blob);
		2212	state->mode_changed = false;
		2213	state->active_changed = false;
		2214	state->planes_changed = false;
		2215	state->connectors_changed = false;
		2216	state->event = NULL;
		2217	}
		2218	EXPORT_SYMBOL(__drm_atomic_helper_crtc_duplicate_state);
		2219
		2220	/**
		2221	* drm_atomic_helper_crtc_duplicate_state - default state duplicate hook
		2222	* @crtc: drm CRTC
		2223	*
		2224	* Default CRTC state duplicate hook for drivers which don't have their own
		2225	* subclassed CRTC state structure.
		2226	*/
		2227	struct drm_crtc_state *
		2228	drm_atomic_helper_crtc_duplicate_state(struct drm_crtc *crtc)
		2229	{
		2230	struct drm_crtc_state *state;
		2231
		2232	if (WARN_ON(!crtc->state))
		2233	return NULL;
		2234
		2235	state = kmalloc(sizeof(*state), GFP_KERNEL);
		2236	if (state)
		2237	__drm_atomic_helper_crtc_duplicate_state(crtc, state);
		2238
		2239	return state;
		2240	}
		2241	EXPORT_SYMBOL(drm_atomic_helper_crtc_duplicate_state);
		2242
		2243	/**
		2244	* __drm_atomic_helper_crtc_destroy_state - release CRTC state
		2245	* @crtc: CRTC object
		2246	* @state: CRTC state object to release
		2247	*
		2248	* Releases all resources stored in the CRTC state without actually freeing
		2249	* the memory of the CRTC state. This is useful for drivers that subclass the
		2250	* CRTC state.
		2251	*/
		2252	void __drm_atomic_helper_crtc_destroy_state(struct drm_crtc *crtc,
		2253	struct drm_crtc_state *state)
		2254	{
		2255	if (state->mode_blob)
		2256	drm_property_unreference_blob(state->mode_blob);
		2257	}
		2258	EXPORT_SYMBOL(__drm_atomic_helper_crtc_destroy_state);
		2259
		2260	/**
		2261	* drm_atomic_helper_crtc_destroy_state - default state destroy hook
		2262	* @crtc: drm CRTC
		2263	* @state: CRTC state object to release
		2264	*
		2265	* Default CRTC state destroy hook for drivers which don't have their own
		2266	* subclassed CRTC state structure.
		2267	*/
		2268	void drm_atomic_helper_crtc_destroy_state(struct drm_crtc *crtc,
		2269	struct drm_crtc_state *state)
		2270	{
		2271	__drm_atomic_helper_crtc_destroy_state(crtc, state);
		2272	kfree(state);
		2273	}
		2274	EXPORT_SYMBOL(drm_atomic_helper_crtc_destroy_state);
		2275
		2276	/**
		2277	* drm_atomic_helper_plane_reset - default ->reset hook for planes
		2278	* @plane: drm plane
		2279	*
		2280	* Resets the atomic state for @plane by freeing the state pointer (which might
		2281	* be NULL, e.g. at driver load time) and allocating a new empty state object.
		2282	*/
		2283	void drm_atomic_helper_plane_reset(struct drm_plane *plane)
		2284	{
		2285	if (plane->state && plane->state->fb)
		2286	drm_framebuffer_unreference(plane->state->fb);
		2287
		2288	kfree(plane->state);
		2289	plane->state = kzalloc(sizeof(*plane->state), GFP_KERNEL);
		2290
		2291	if (plane->state)
		2292	plane->state->plane = plane;
		2293	}
		2294	EXPORT_SYMBOL(drm_atomic_helper_plane_reset);
		2295
		2296	/**
		2297	* __drm_atomic_helper_plane_duplicate_state - copy atomic plane state
		2298	* @plane: plane object
		2299	* @state: atomic plane state
		2300	*
		2301	* Copies atomic state from a plane's current state. This is useful for
		2302	* drivers that subclass the plane state.
		2303	*/
		2304	void __drm_atomic_helper_plane_duplicate_state(struct drm_plane *plane,
		2305	struct drm_plane_state *state)
		2306	{
		2307	memcpy(state, plane->state, sizeof(*state));
		2308
		2309	if (state->fb)
		2310	drm_framebuffer_reference(state->fb);
		2311	}
		2312	EXPORT_SYMBOL(__drm_atomic_helper_plane_duplicate_state);
		2313
		2314	/**
		2315	* drm_atomic_helper_plane_duplicate_state - default state duplicate hook
		2316	* @plane: drm plane
		2317	*
		2318	* Default plane state duplicate hook for drivers which don't have their own
		2319	* subclassed plane state structure.
		2320	*/
		2321	struct drm_plane_state *
		2322	drm_atomic_helper_plane_duplicate_state(struct drm_plane *plane)
		2323	{
		2324	struct drm_plane_state *state;
		2325
		2326	if (WARN_ON(!plane->state))
		2327	return NULL;
		2328
		2329	state = kmalloc(sizeof(*state), GFP_KERNEL);
		2330	if (state)
		2331	__drm_atomic_helper_plane_duplicate_state(plane, state);
		2332
		2333	return state;
		2334	}
		2335	EXPORT_SYMBOL(drm_atomic_helper_plane_duplicate_state);
		2336
		2337	/**
		2338	* __drm_atomic_helper_plane_destroy_state - release plane state
		2339	* @plane: plane object
		2340	* @state: plane state object to release
		2341	*
		2342	* Releases all resources stored in the plane state without actually freeing
		2343	* the memory of the plane state. This is useful for drivers that subclass the
		2344	* plane state.
		2345	*/
		2346	void __drm_atomic_helper_plane_destroy_state(struct drm_plane *plane,
		2347	struct drm_plane_state *state)
		2348	{
		2349	if (state->fb)
		2350	drm_framebuffer_unreference(state->fb);
		2351	}
		2352	EXPORT_SYMBOL(__drm_atomic_helper_plane_destroy_state);
		2353
		2354	/**
		2355	* drm_atomic_helper_plane_destroy_state - default state destroy hook
		2356	* @plane: drm plane
		2357	* @state: plane state object to release
		2358	*
		2359	* Default plane state destroy hook for drivers which don't have their own
		2360	* subclassed plane state structure.
		2361	*/
		2362	void drm_atomic_helper_plane_destroy_state(struct drm_plane *plane,
		2363	struct drm_plane_state *state)
		2364	{
		2365	__drm_atomic_helper_plane_destroy_state(plane, state);
		2366	kfree(state);
		2367	}
		2368	EXPORT_SYMBOL(drm_atomic_helper_plane_destroy_state);
		2369
		2370	/**
		2371	* drm_atomic_helper_connector_reset - default ->reset hook for connectors
		2372	* @connector: drm connector
		2373	*
		2374	* Resets the atomic state for @connector by freeing the state pointer (which
		2375	* might be NULL, e.g. at driver load time) and allocating a new empty state
		2376	* object.
		2377	*/
		2378	void drm_atomic_helper_connector_reset(struct drm_connector *connector)
		2379	{
		2380	kfree(connector->state);
		2381	connector->state = kzalloc(sizeof(*connector->state), GFP_KERNEL);
		2382
		2383	if (connector->state)
		2384	connector->state->connector = connector;
		2385	}
		2386	EXPORT_SYMBOL(drm_atomic_helper_connector_reset);
		2387
		2388	/**
		2389	* __drm_atomic_helper_connector_duplicate_state - copy atomic connector state
		2390	* @connector: connector object
		2391	* @state: atomic connector state
		2392	*
		2393	* Copies atomic state from a connector's current state. This is useful for
		2394	* drivers that subclass the connector state.
		2395	*/
		2396	void
		2397	__drm_atomic_helper_connector_duplicate_state(struct drm_connector *connector,
		2398	struct drm_connector_state *state)
		2399	{
		2400	memcpy(state, connector->state, sizeof(*state));
		2401	}
		2402	EXPORT_SYMBOL(__drm_atomic_helper_connector_duplicate_state);
		2403
		2404	/**
		2405	* drm_atomic_helper_connector_duplicate_state - default state duplicate hook
		2406	* @connector: drm connector
		2407	*
		2408	* Default connector state duplicate hook for drivers which don't have their own
		2409	* subclassed connector state structure.
		2410	*/
		2411	struct drm_connector_state *
		2412	drm_atomic_helper_connector_duplicate_state(struct drm_connector *connector)
		2413	{
		2414	struct drm_connector_state *state;
		2415
		2416	if (WARN_ON(!connector->state))
		2417	return NULL;
		2418
		2419	state = kmalloc(sizeof(*state), GFP_KERNEL);
		2420	if (state)
		2421	__drm_atomic_helper_connector_duplicate_state(connector, state);
		2422
		2423	return state;
		2424	}
		2425	EXPORT_SYMBOL(drm_atomic_helper_connector_duplicate_state);
		2426
		2427	/**
		2428	* drm_atomic_helper_duplicate_state - duplicate an atomic state object
		2429	* @dev: DRM device
		2430	* @ctx: lock acquisition context
		2431	*
		2432	* Makes a copy of the current atomic state by looping over all objects and
		2433	* duplicating their respective states.
		2434	*
		2435	* Note that this treats atomic state as persistent between save and restore.
		2436	* Drivers must make sure that this is possible and won't result in confusion
		2437	* or erroneous behaviour.
		2438	*
		2439	* Note that if callers haven't already acquired all modeset locks this might
		2440	* return -EDEADLK, which must be handled by calling drm_modeset_backoff().
		2441	*
		2442	* Returns:
		2443	* A pointer to the copy of the atomic state object on success or an
		2444	* ERR_PTR()-encoded error code on failure.
		2445	*/
		2446	struct drm_atomic_state *
		2447	drm_atomic_helper_duplicate_state(struct drm_device *dev,
		2448	struct drm_modeset_acquire_ctx *ctx)
		2449	{
		2450	struct drm_atomic_state *state;
		2451	struct drm_connector *conn;
		2452	struct drm_plane *plane;
		2453	struct drm_crtc *crtc;
		2454	int err = 0;
		2455
		2456	state = drm_atomic_state_alloc(dev);
		2457	if (!state)
		2458	return ERR_PTR(-ENOMEM);
		2459
		2460	state->acquire_ctx = ctx;
		2461
		2462	drm_for_each_crtc(crtc, dev) {
		2463	struct drm_crtc_state *crtc_state;
		2464
		2465	crtc_state = drm_atomic_get_crtc_state(state, crtc);
		2466	if (IS_ERR(crtc_state)) {
		2467	err = PTR_ERR(crtc_state);
		2468	goto free;
		2469	}
		2470	}
		2471
		2472	drm_for_each_plane(plane, dev) {
		2473	struct drm_plane_state *plane_state;
		2474
		2475	plane_state = drm_atomic_get_plane_state(state, plane);
		2476	if (IS_ERR(plane_state)) {
		2477	err = PTR_ERR(plane_state);
		2478	goto free;
		2479	}
		2480	}
		2481
		2482	drm_for_each_connector(conn, dev) {
		2483	struct drm_connector_state *conn_state;
		2484
		2485	conn_state = drm_atomic_get_connector_state(state, conn);
		2486	if (IS_ERR(conn_state)) {
		2487	err = PTR_ERR(conn_state);
		2488	goto free;
		2489	}
		2490	}
		2491
		2492	/* clear the acquire context so that it isn't accidentally reused */
		2493	state->acquire_ctx = NULL;
		2494
		2495	free:
		2496	if (err < 0) {
		2497	drm_atomic_state_free(state);
		2498	state = ERR_PTR(err);
		2499	}
		2500
		2501	return state;
		2502	}
		2503	EXPORT_SYMBOL(drm_atomic_helper_duplicate_state);
		2504
		2505	/**
		2506	* __drm_atomic_helper_connector_destroy_state - release connector state
		2507	* @connector: connector object
		2508	* @state: connector state object to release
		2509	*
		2510	* Releases all resources stored in the connector state without actually
		2511	* freeing the memory of the connector state. This is useful for drivers that
		2512	* subclass the connector state.
		2513	*/
		2514	void
		2515	__drm_atomic_helper_connector_destroy_state(struct drm_connector *connector,
		2516	struct drm_connector_state *state)
		2517	{
		2518	/*
		2519	* This is currently a placeholder so that drivers that subclass the
		2520	* state will automatically do the right thing if code is ever added
		2521	* to this function.
		2522	*/
		2523	}
		2524	EXPORT_SYMBOL(__drm_atomic_helper_connector_destroy_state);
		2525
		2526	/**
		2527	* drm_atomic_helper_connector_destroy_state - default state destroy hook
		2528	* @connector: drm connector
		2529	* @state: connector state object to release
		2530	*
		2531	* Default connector state destroy hook for drivers which don't have their own
		2532	* subclassed connector state structure.
		2533	*/
		2534	void drm_atomic_helper_connector_destroy_state(struct drm_connector *connector,
		2535	struct drm_connector_state *state)
		2536	{
		2537	__drm_atomic_helper_connector_destroy_state(connector, state);
		2538	kfree(state);
		2539	}
		2540	EXPORT_SYMBOL(drm_atomic_helper_connector_destroy_state);

Subversion Repositories Kolibri OS

(root)/drivers/video/drm/drm_atomic_helper.c @ 6321 – Rev 6088