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

Rev	Author	Line No.	Line
1179	serge	1	/*
		2	* Copyright (c) 2006-2009 Red Hat Inc.
		3	* Copyright (c) 2006-2008 Intel Corporation
		4	* Copyright (c) 2007 Dave Airlie
		5	*
		6	* DRM framebuffer helper functions
		7	*
		8	* Permission to use, copy, modify, distribute, and sell this software and its
		9	* documentation for any purpose is hereby granted without fee, provided that
		10	* the above copyright notice appear in all copies and that both that copyright
		11	* notice and this permission notice appear in supporting documentation, and
		12	* that the name of the copyright holders not be used in advertising or
		13	* publicity pertaining to distribution of the software without specific,
		14	* written prior permission. The copyright holders make no representations
		15	* about the suitability of this software for any purpose. It is provided "as
		16	* is" without express or implied warranty.
		17	*
		18	* THE COPYRIGHT HOLDERS DISCLAIM ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
		19	* INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO
		20	* EVENT SHALL THE COPYRIGHT HOLDERS BE LIABLE FOR ANY SPECIAL, INDIRECT OR
		21	* CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE,
		22	* DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
		23	* TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
		24	* OF THIS SOFTWARE.
		25	*
		26	* Authors:
		27	* Dave Airlie
		28	* Jesse Barnes
		29	*/
3192	Serge	30	#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
		31
1430	serge	32	#include
1963	serge	33	#include
		34	#include
1179	serge	35	#include
3031	serge	36	#include
		37	#include
		38	#include
		39	#include
		40	#include
6084	serge	41	#include
		42	#include
1179	serge	43
6084	serge	44	static bool drm_fbdev_emulation = true;
		45	module_param_named(fbdev_emulation, drm_fbdev_emulation, bool, 0600);
		46	MODULE_PARM_DESC(fbdev_emulation,
		47	"Enable legacy fbdev emulation [default=true]");
		48
1179	serge	49	static LIST_HEAD(kernel_fb_helper_list);
		50
3192	Serge	51	/**
		52	* DOC: fbdev helpers
		53	*
		54	* The fb helper functions are useful to provide an fbdev on top of a drm kernel
5060	serge	55	* mode setting driver. They can be used mostly independently from the crtc
3192	Serge	56	* helper functions used by many drivers to implement the kernel mode setting
		57	* interfaces.
3480	Serge	58	*
5060	serge	59	* Initialization is done as a four-step process with drm_fb_helper_prepare(),
		60	* drm_fb_helper_init(), drm_fb_helper_single_add_all_connectors() and
		61	* drm_fb_helper_initial_config(). Drivers with fancier requirements than the
		62	* default behaviour can override the third step with their own code.
		63	* Teardown is done with drm_fb_helper_fini().
3480	Serge	64	*
		65	* At runtime drivers should restore the fbdev console by calling
6084	serge	66	* drm_fb_helper_restore_fbdev_mode_unlocked() from their ->lastclose callback.
		67	* They should also notify the fb helper code from updates to the output
3480	Serge	68	* configuration by calling drm_fb_helper_hotplug_event(). For easier
		69	* integration with the output polling code in drm_crtc_helper.c the modeset
5060	serge	70	* code provides a ->output_poll_changed callback.
3480	Serge	71	*
		72	* All other functions exported by the fb helper library can be used to
		73	* implement the fbdev driver interface by the driver.
5060	serge	74	*
		75	* It is possible, though perhaps somewhat tricky, to implement race-free
		76	* hotplug detection using the fbdev helpers. The drm_fb_helper_prepare()
		77	* helper must be called first to initialize the minimum required to make
		78	* hotplug detection work. Drivers also need to make sure to properly set up
		79	* the dev->mode_config.funcs member. After calling drm_kms_helper_poll_init()
		80	* it is safe to enable interrupts and start processing hotplug events. At the
		81	* same time, drivers should initialize all modeset objects such as CRTCs,
		82	* encoders and connectors. To finish up the fbdev helper initialization, the
		83	* drm_fb_helper_init() function is called. To probe for all attached displays
		84	* and set up an initial configuration using the detected hardware, drivers
		85	* should call drm_fb_helper_single_add_all_connectors() followed by
		86	* drm_fb_helper_initial_config().
3192	Serge	87	*/
		88
3480	Serge	89	/**
		90	* drm_fb_helper_single_add_all_connectors() - add all connectors to fbdev
		91	* emulation helper
		92	* @fb_helper: fbdev initialized with drm_fb_helper_init
		93	*
		94	* This functions adds all the available connectors for use with the given
		95	* fb_helper. This is a separate step to allow drivers to freely assign
		96	* connectors to the fbdev, e.g. if some are reserved for special purposes or
		97	* not adequate to be used for the fbcon.
		98	*
6084	serge	99	* This function is protected against concurrent connector hotadds/removals
		100	* using drm_fb_helper_add_one_connector() and
		101	* drm_fb_helper_remove_one_connector().
3480	Serge	102	*/
1963	serge	103	int drm_fb_helper_single_add_all_connectors(struct drm_fb_helper *fb_helper)
1221	serge	104	{
1963	serge	105	struct drm_device *dev = fb_helper->dev;
		106	struct drm_connector *connector;
		107	int i;
1221	serge	108
6084	serge	109	if (!drm_fbdev_emulation)
		110	return 0;
		111
		112	mutex_lock(&dev->mode_config.mutex);
		113	drm_for_each_connector(connector, dev) {
1963	serge	114	struct drm_fb_helper_connector *fb_helper_connector;
		115
		116	fb_helper_connector = kzalloc(sizeof(struct drm_fb_helper_connector), GFP_KERNEL);
		117	if (!fb_helper_connector)
		118	goto fail;
		119
		120	fb_helper_connector->connector = connector;
		121	fb_helper->connector_info[fb_helper->connector_count++] = fb_helper_connector;
		122	}
6084	serge	123	mutex_unlock(&dev->mode_config.mutex);
1221	serge	124	return 0;
1963	serge	125	fail:
		126	for (i = 0; i < fb_helper->connector_count; i++) {
		127	kfree(fb_helper->connector_info[i]);
		128	fb_helper->connector_info[i] = NULL;
		129	}
		130	fb_helper->connector_count = 0;
6084	serge	131	mutex_unlock(&dev->mode_config.mutex);
		132
		133	return -ENOMEM;
1221	serge	134	}
1963	serge	135	EXPORT_SYMBOL(drm_fb_helper_single_add_all_connectors);
1221	serge	136
5060	serge	137	int drm_fb_helper_add_one_connector(struct drm_fb_helper fb_helper, struct drm_connector connector)
		138	{
		139	struct drm_fb_helper_connector **temp;
		140	struct drm_fb_helper_connector *fb_helper_connector;
		141
6084	serge	142	if (!drm_fbdev_emulation)
		143	return 0;
		144
5060	serge	145	WARN_ON(!mutex_is_locked(&fb_helper->dev->mode_config.mutex));
		146	if (fb_helper->connector_count + 1 > fb_helper->connector_info_alloc_count) {
5271	serge	147	temp = krealloc(fb_helper->connector_info, sizeof(struct drm_fb_helper_connector ) (fb_helper->connector_count + 1), GFP_KERNEL);
5060	serge	148	if (!temp)
		149	return -ENOMEM;
		150
		151	fb_helper->connector_info_alloc_count = fb_helper->connector_count + 1;
		152	fb_helper->connector_info = temp;
		153	}
		154
		155
		156	fb_helper_connector = kzalloc(sizeof(struct drm_fb_helper_connector), GFP_KERNEL);
		157	if (!fb_helper_connector)
		158	return -ENOMEM;
		159
		160	fb_helper_connector->connector = connector;
		161	fb_helper->connector_info[fb_helper->connector_count++] = fb_helper_connector;
		162	return 0;
		163	}
		164	EXPORT_SYMBOL(drm_fb_helper_add_one_connector);
		165
6084	serge	166	static void remove_from_modeset(struct drm_mode_set *set,
		167	struct drm_connector *connector)
		168	{
		169	int i, j;
		170
		171	for (i = 0; i < set->num_connectors; i++) {
		172	if (set->connectors[i] == connector)
		173	break;
		174	}
		175
		176	if (i == set->num_connectors)
		177	return;
		178
		179	for (j = i + 1; j < set->num_connectors; j++) {
		180	set->connectors[j - 1] = set->connectors[j];
		181	}
		182	set->num_connectors--;
		183
		184	/*
		185	* TODO maybe need to makes sure we set it back to !=NULL somewhere?
		186	*/
		187	if (set->num_connectors == 0) {
		188	set->fb = NULL;
		189	drm_mode_destroy(connector->dev, set->mode);
		190	set->mode = NULL;
		191	}
		192	}
		193
5060	serge	194	int drm_fb_helper_remove_one_connector(struct drm_fb_helper *fb_helper,
		195	struct drm_connector *connector)
		196	{
		197	struct drm_fb_helper_connector *fb_helper_connector;
		198	int i, j;
		199
6084	serge	200	if (!drm_fbdev_emulation)
		201	return 0;
		202
5060	serge	203	WARN_ON(!mutex_is_locked(&fb_helper->dev->mode_config.mutex));
		204
		205	for (i = 0; i < fb_helper->connector_count; i++) {
		206	if (fb_helper->connector_info[i]->connector == connector)
		207	break;
		208	}
		209
		210	if (i == fb_helper->connector_count)
		211	return -EINVAL;
		212	fb_helper_connector = fb_helper->connector_info[i];
		213
		214	for (j = i + 1; j < fb_helper->connector_count; j++) {
		215	fb_helper->connector_info[j - 1] = fb_helper->connector_info[j];
		216	}
		217	fb_helper->connector_count--;
		218	kfree(fb_helper_connector);
6084	serge	219
		220	/* also cleanup dangling references to the connector: */
		221	for (i = 0; i < fb_helper->crtc_count; i++)
		222	remove_from_modeset(&fb_helper->crtc_info[i].mode_set, connector);
		223
5060	serge	224	return 0;
		225	}
		226	EXPORT_SYMBOL(drm_fb_helper_remove_one_connector);
5271	serge	227
1963	serge	228	static void drm_fb_helper_save_lut_atomic(struct drm_crtc crtc, struct drm_fb_helper helper)
1179	serge	229	{
1963	serge	230	uint16_t r_base, g_base, *b_base;
		231	int i;
1179	serge	232
4104	Serge	233	if (helper->funcs->gamma_get == NULL)
		234	return;
		235
1963	serge	236	r_base = crtc->gamma_store;
		237	g_base = r_base + crtc->gamma_size;
		238	b_base = g_base + crtc->gamma_size;
1179	serge	239
1963	serge	240	for (i = 0; i < crtc->gamma_size; i++)
		241	helper->funcs->gamma_get(crtc, &r_base[i], &g_base[i], &b_base[i], i);
1179	serge	242	}
		243
1963	serge	244	static void drm_fb_helper_restore_lut_atomic(struct drm_crtc *crtc)
1179	serge	245	{
1963	serge	246	uint16_t r_base, g_base, *b_base;
		247
3031	serge	248	if (crtc->funcs->gamma_set == NULL)
		249	return;
		250
1963	serge	251	r_base = crtc->gamma_store;
		252	g_base = r_base + crtc->gamma_size;
		253	b_base = g_base + crtc->gamma_size;
		254
		255	crtc->funcs->gamma_set(crtc, r_base, g_base, b_base, 0, crtc->gamma_size);
1179	serge	256	}
		257
6084	serge	258	/* Find the real fb for a given fb helper CRTC */
		259	static struct drm_framebuffer drm_mode_config_fb(struct drm_crtc crtc)
		260	{
		261	struct drm_device *dev = crtc->dev;
		262	struct drm_crtc *c;
1179	serge	263
6084	serge	264	drm_for_each_crtc(c, dev) {
		265	if (crtc->base.id == c->base.id)
		266	return c->primary->fb;
		267	}
		268
		269	return NULL;
		270	}
		271	static int restore_fbdev_mode_atomic(struct drm_fb_helper *fb_helper)
5060	serge	272	{
		273	struct drm_device *dev = fb_helper->dev;
		274	struct drm_plane *plane;
6084	serge	275	struct drm_atomic_state *state;
		276	int i, ret;
		277	unsigned plane_mask;
		278
		279	state = drm_atomic_state_alloc(dev);
		280	if (!state)
		281	return -ENOMEM;
		282
		283	state->acquire_ctx = dev->mode_config.acquire_ctx;
		284	retry:
		285	plane_mask = 0;
		286	drm_for_each_plane(plane, dev) {
		287	struct drm_plane_state *plane_state;
		288
		289	plane_state = drm_atomic_get_plane_state(state, plane);
		290	if (IS_ERR(plane_state)) {
		291	ret = PTR_ERR(plane_state);
		292	goto fail;
		293	}
		294
		295	plane_state->rotation = BIT(DRM_ROTATE_0);
		296
		297	plane->old_fb = plane->fb;
		298	plane_mask \|= 1 << drm_plane_index(plane);
		299
		300	/* disable non-primary: */
		301	if (plane->type == DRM_PLANE_TYPE_PRIMARY)
		302	continue;
		303
		304	ret = __drm_atomic_helper_disable_plane(plane, plane_state);
		305	if (ret != 0)
		306	goto fail;
		307	}
		308
		309	for(i = 0; i < fb_helper->crtc_count; i++) {
		310	struct drm_mode_set *mode_set = &fb_helper->crtc_info[i].mode_set;
		311
		312	ret = __drm_atomic_helper_set_config(mode_set, state);
		313	if (ret != 0)
		314	goto fail;
		315	}
		316
		317	ret = drm_atomic_commit(state);
		318
		319	fail:
		320	drm_atomic_clean_old_fb(dev, plane_mask, ret);
		321
		322	if (ret == -EDEADLK)
		323	goto backoff;
		324
		325	if (ret != 0)
		326	drm_atomic_state_free(state);
		327
		328	return ret;
		329
		330	backoff:
		331	drm_atomic_state_clear(state);
		332	drm_atomic_legacy_backoff(state);
		333
		334	goto retry;
		335	}
		336
		337	static int restore_fbdev_mode(struct drm_fb_helper *fb_helper)
		338	{
		339	struct drm_device *dev = fb_helper->dev;
		340	struct drm_plane *plane;
5060	serge	341	int i;
		342
		343	drm_warn_on_modeset_not_all_locked(dev);
		344
6084	serge	345	if (fb_helper->atomic)
		346	return restore_fbdev_mode_atomic(fb_helper);
		347
		348	drm_for_each_plane(plane, dev) {
5060	serge	349	if (plane->type != DRM_PLANE_TYPE_PRIMARY)
		350	drm_plane_force_disable(plane);
		351
5271	serge	352	if (dev->mode_config.rotation_property) {
		353	drm_mode_plane_set_obj_prop(plane,
		354	dev->mode_config.rotation_property,
		355	BIT(DRM_ROTATE_0));
		356	}
		357	}
		358
5060	serge	359	for (i = 0; i < fb_helper->crtc_count; i++) {
		360	struct drm_mode_set *mode_set = &fb_helper->crtc_info[i].mode_set;
		361	struct drm_crtc *crtc = mode_set->crtc;
		362	int ret;
		363
6084	serge	364	if (crtc->funcs->cursor_set2) {
		365	ret = crtc->funcs->cursor_set2(crtc, NULL, 0, 0, 0, 0, 0);
		366	if (ret)
		367	return ret;
		368	} else if (crtc->funcs->cursor_set) {
5060	serge	369	ret = crtc->funcs->cursor_set(crtc, NULL, 0, 0, 0);
		370	if (ret)
6084	serge	371	return ret;
5060	serge	372	}
		373
		374	ret = drm_mode_set_config_internal(mode_set);
		375	if (ret)
6084	serge	376	return ret;
5060	serge	377	}
6084	serge	378
		379	return 0;
5060	serge	380	}
6084	serge	381
5060	serge	382	/**
		383	* drm_fb_helper_restore_fbdev_mode_unlocked - restore fbdev configuration
		384	* @fb_helper: fbcon to restore
		385	*
		386	* This should be called from driver's drm ->lastclose callback
		387	* when implementing an fbcon on top of kms using this helper. This ensures that
		388	* the user isn't greeted with a black screen when e.g. X dies.
6084	serge	389	*
		390	* RETURNS:
		391	* Zero if everything went ok, negative error code otherwise.
5060	serge	392	*/
6084	serge	393	int drm_fb_helper_restore_fbdev_mode_unlocked(struct drm_fb_helper *fb_helper)
5060	serge	394	{
		395	struct drm_device *dev = fb_helper->dev;
6084	serge	396	bool do_delayed;
		397	int ret;
5271	serge	398
6084	serge	399	if (!drm_fbdev_emulation)
		400	return -ENODEV;
		401
5060	serge	402	drm_modeset_lock_all(dev);
		403	ret = restore_fbdev_mode(fb_helper);
6084	serge	404
		405	do_delayed = fb_helper->delayed_hotplug;
		406	if (do_delayed)
		407	fb_helper->delayed_hotplug = false;
5060	serge	408	drm_modeset_unlock_all(dev);
6084	serge	409
		410	if (do_delayed)
		411	drm_fb_helper_hotplug_event(fb_helper);
5060	serge	412	return ret;
		413	}
		414	EXPORT_SYMBOL(drm_fb_helper_restore_fbdev_mode_unlocked);
		415
3480	Serge	416	static bool drm_fb_helper_is_bound(struct drm_fb_helper *fb_helper)
		417	{
		418	struct drm_device *dev = fb_helper->dev;
		419	struct drm_crtc *crtc;
		420	int bound = 0, crtcs_bound = 0;
1179	serge	421
6084	serge	422	/* Sometimes user space wants everything disabled, so don't steal the
		423	* display if there's a master. */
6296	serge	424	// if (dev->primary->master)
		425	// return false;
6084	serge	426
		427	drm_for_each_crtc(crtc, dev) {
5060	serge	428	if (crtc->primary->fb)
3480	Serge	429	crtcs_bound++;
5060	serge	430	if (crtc->primary->fb == fb_helper->fb)
3480	Serge	431	bound++;
		432	}
		433
		434	if (bound < crtcs_bound)
		435	return false;
4560	Serge	436
3480	Serge	437	return true;
		438	}
		439
4560	Serge	440	#ifdef CONFIG_MAGIC_SYSRQ
		441	static void drm_fb_helper_restore_work_fn(struct work_struct *ignored)
		442	{
		443	bool ret;
		444	ret = drm_fb_helper_force_kernel_mode();
		445	if (ret == true)
		446	DRM_ERROR("Failed to restore crtc configuration\n");
		447	}
		448	static DECLARE_WORK(drm_fb_helper_restore_work, drm_fb_helper_restore_work_fn);
		449
		450	static void drm_fb_helper_sysrq(int dummy1)
		451	{
		452	schedule_work(&drm_fb_helper_restore_work);
		453	}
		454
		455	static struct sysrq_key_op sysrq_drm_fb_helper_restore_op = {
		456	.handler = drm_fb_helper_sysrq,
		457	.help_msg = "force-fb(V)",
		458	.action_msg = "Restore framebuffer console",
		459	};
		460	#else
		461
		462	#endif
		463
3031	serge	464	static void drm_fb_helper_dpms(struct fb_info *info, int dpms_mode)
1179	serge	465	{
		466	struct drm_fb_helper *fb_helper = info->par;
		467	struct drm_device *dev = fb_helper->dev;
		468	struct drm_crtc *crtc;
1963	serge	469	struct drm_connector *connector;
		470	int i, j;
1179	serge	471
		472	/*
3031	serge	473	* For each CRTC in this fb, turn the connectors on/off.
1179	serge	474	*/
3480	Serge	475	drm_modeset_lock_all(dev);
		476	if (!drm_fb_helper_is_bound(fb_helper)) {
		477	drm_modeset_unlock_all(dev);
		478	return;
		479	}
		480
1179	serge	481	for (i = 0; i < fb_helper->crtc_count; i++) {
1963	serge	482	crtc = fb_helper->crtc_info[i].mode_set.crtc;
1179	serge	483
1963	serge	484	if (!crtc->enabled)
6084	serge	485	continue;
1179	serge	486
3031	serge	487	/* Walk the connectors & encoders on this fb turning them on/off */
1963	serge	488	for (j = 0; j < fb_helper->connector_count; j++) {
		489	connector = fb_helper->connector_info[j]->connector;
3031	serge	490	connector->funcs->dpms(connector, dpms_mode);
3192	Serge	491	drm_object_property_set_value(&connector->base,
3031	serge	492	dev->mode_config.dpms_property, dpms_mode);
1963	serge	493	}
		494	}
3480	Serge	495	drm_modeset_unlock_all(dev);
1179	serge	496	}
		497
3480	Serge	498	/**
		499	* drm_fb_helper_blank - implementation for ->fb_blank
		500	* @blank: desired blanking state
		501	* @info: fbdev registered by the helper
		502	*/
1179	serge	503	int drm_fb_helper_blank(int blank, struct fb_info *info)
		504	{
6084	serge	505	if (oops_in_progress)
		506	return -EBUSY;
		507
1179	serge	508	switch (blank) {
1321	serge	509	/* Display: On; HSync: On, VSync: On */
1179	serge	510	case FB_BLANK_UNBLANK:
3031	serge	511	drm_fb_helper_dpms(info, DRM_MODE_DPMS_ON);
1179	serge	512	break;
1321	serge	513	/* Display: Off; HSync: On, VSync: On */
1179	serge	514	case FB_BLANK_NORMAL:
3031	serge	515	drm_fb_helper_dpms(info, DRM_MODE_DPMS_STANDBY);
1179	serge	516	break;
1321	serge	517	/* Display: Off; HSync: Off, VSync: On */
1179	serge	518	case FB_BLANK_HSYNC_SUSPEND:
3031	serge	519	drm_fb_helper_dpms(info, DRM_MODE_DPMS_STANDBY);
1179	serge	520	break;
1321	serge	521	/* Display: Off; HSync: On, VSync: Off */
1179	serge	522	case FB_BLANK_VSYNC_SUSPEND:
3031	serge	523	drm_fb_helper_dpms(info, DRM_MODE_DPMS_SUSPEND);
1179	serge	524	break;
1321	serge	525	/* Display: Off; HSync: Off, VSync: Off */
1179	serge	526	case FB_BLANK_POWERDOWN:
3031	serge	527	drm_fb_helper_dpms(info, DRM_MODE_DPMS_OFF);
1179	serge	528	break;
		529	}
		530	return 0;
		531	}
		532	EXPORT_SYMBOL(drm_fb_helper_blank);
		533
		534	static void drm_fb_helper_crtc_free(struct drm_fb_helper *helper)
		535	{
		536	int i;
		537
1963	serge	538	for (i = 0; i < helper->connector_count; i++)
		539	kfree(helper->connector_info[i]);
		540	kfree(helper->connector_info);
3031	serge	541	for (i = 0; i < helper->crtc_count; i++) {
1179	serge	542	kfree(helper->crtc_info[i].mode_set.connectors);
3031	serge	543	if (helper->crtc_info[i].mode_set.mode)
		544	drm_mode_destroy(helper->dev, helper->crtc_info[i].mode_set.mode);
		545	}
1179	serge	546	kfree(helper->crtc_info);
		547	}
		548
3480	Serge	549	/**
5060	serge	550	* drm_fb_helper_prepare - setup a drm_fb_helper structure
		551	* @dev: DRM device
		552	* @helper: driver-allocated fbdev helper structure to set up
		553	* @funcs: pointer to structure of functions associate with this helper
		554	*
		555	* Sets up the bare minimum to make the framebuffer helper usable. This is
		556	* useful to implement race-free initialization of the polling helpers.
		557	*/
		558	void drm_fb_helper_prepare(struct drm_device dev, struct drm_fb_helper helper,
		559	const struct drm_fb_helper_funcs *funcs)
		560	{
		561	INIT_LIST_HEAD(&helper->kernel_fb_list);
		562	helper->funcs = funcs;
		563	helper->dev = dev;
		564	}
		565	EXPORT_SYMBOL(drm_fb_helper_prepare);
		566
		567	/**
3480	Serge	568	* drm_fb_helper_init - initialize a drm_fb_helper structure
		569	* @dev: drm device
		570	* @fb_helper: driver-allocated fbdev helper structure to initialize
		571	* @crtc_count: maximum number of crtcs to support in this fbdev emulation
		572	* @max_conn_count: max connector count
		573	*
		574	* This allocates the structures for the fbdev helper with the given limits.
		575	* Note that this won't yet touch the hardware (through the driver interfaces)
		576	* nor register the fbdev. This is only done in drm_fb_helper_initial_config()
		577	* to allow driver writes more control over the exact init sequence.
		578	*
5060	serge	579	* Drivers must call drm_fb_helper_prepare() before calling this function.
3480	Serge	580	*
		581	* RETURNS:
		582	* Zero if everything went ok, nonzero otherwise.
		583	*/
1963	serge	584	int drm_fb_helper_init(struct drm_device *dev,
		585	struct drm_fb_helper *fb_helper,
		586	int crtc_count, int max_conn_count)
1179	serge	587	{
		588	struct drm_crtc *crtc;
		589	int i;
		590
6084	serge	591	if (!drm_fbdev_emulation)
		592	return 0;
		593
5060	serge	594	if (!max_conn_count)
		595	return -EINVAL;
1963	serge	596
		597	fb_helper->crtc_info = kcalloc(crtc_count, sizeof(struct drm_fb_helper_crtc), GFP_KERNEL);
		598	if (!fb_helper->crtc_info)
1179	serge	599	return -ENOMEM;
		600
1963	serge	601	fb_helper->crtc_count = crtc_count;
		602	fb_helper->connector_info = kcalloc(dev->mode_config.num_connector, sizeof(struct drm_fb_helper_connector *), GFP_KERNEL);
		603	if (!fb_helper->connector_info) {
		604	kfree(fb_helper->crtc_info);
		605	return -ENOMEM;
		606	}
5060	serge	607	fb_helper->connector_info_alloc_count = dev->mode_config.num_connector;
1963	serge	608	fb_helper->connector_count = 0;
1179	serge	609
		610	for (i = 0; i < crtc_count; i++) {
1963	serge	611	fb_helper->crtc_info[i].mode_set.connectors =
1179	serge	612	kcalloc(max_conn_count,
		613	sizeof(struct drm_connector *),
		614	GFP_KERNEL);
		615
3031	serge	616	if (!fb_helper->crtc_info[i].mode_set.connectors)
1179	serge	617	goto out_free;
1963	serge	618	fb_helper->crtc_info[i].mode_set.num_connectors = 0;
1179	serge	619	}
		620
		621	i = 0;
6084	serge	622	drm_for_each_crtc(crtc, dev) {
1963	serge	623	fb_helper->crtc_info[i].mode_set.crtc = crtc;
1179	serge	624	i++;
		625	}
3031	serge	626
6084	serge	627	fb_helper->atomic = !!drm_core_check_feature(dev, DRIVER_ATOMIC);
		628
1179	serge	629	return 0;
		630	out_free:
1963	serge	631	drm_fb_helper_crtc_free(fb_helper);
1179	serge	632	return -ENOMEM;
		633	}
1963	serge	634	EXPORT_SYMBOL(drm_fb_helper_init);
1179	serge	635
6084	serge	636	/**
		637	* drm_fb_helper_alloc_fbi - allocate fb_info and some of its members
		638	* @fb_helper: driver-allocated fbdev helper
		639	*
		640	* A helper to alloc fb_info and the members cmap and apertures. Called
		641	* by the driver within the fb_probe fb_helper callback function.
		642	*
		643	* RETURNS:
		644	* fb_info pointer if things went okay, pointer containing error code
		645	* otherwise
		646	*/
		647	struct fb_info drm_fb_helper_alloc_fbi(struct drm_fb_helper fb_helper)
		648	{
		649	struct device *dev = fb_helper->dev->dev;
		650	struct fb_info *info;
		651	int ret;
		652
		653	info = framebuffer_alloc(0, dev);
		654	if (!info)
		655	return ERR_PTR(-ENOMEM);
		656
		657
		658	fb_helper->fbdev = info;
		659
		660	return info;
		661
		662	}
		663	EXPORT_SYMBOL(drm_fb_helper_alloc_fbi);
1246	serge	664	static int setcolreg(struct drm_crtc *crtc, u16 red, u16 green,
1221	serge	665	u16 blue, u16 regno, struct fb_info *info)
		666	{
		667	struct drm_fb_helper *fb_helper = info->par;
		668	struct drm_framebuffer *fb = fb_helper->fb;
		669	int pindex;
		670
1246	serge	671	if (info->fix.visual == FB_VISUAL_TRUECOLOR) {
		672	u32 *palette;
		673	u32 value;
		674	/* place color in psuedopalette */
		675	if (regno > 16)
		676	return -EINVAL;
		677	palette = (u32 *)info->pseudo_palette;
		678	red >>= (16 - info->var.red.length);
		679	green >>= (16 - info->var.green.length);
		680	blue >>= (16 - info->var.blue.length);
		681	value = (red << info->var.red.offset) \|
		682	(green << info->var.green.offset) \|
		683	(blue << info->var.blue.offset);
1963	serge	684	if (info->var.transp.length > 0) {
		685	u32 mask = (1 << info->var.transp.length) - 1;
		686	mask <<= info->var.transp.offset;
		687	value \|= mask;
		688	}
1246	serge	689	palette[regno] = value;
		690	return 0;
		691	}
		692
4104	Serge	693	/*
		694	* The driver really shouldn't advertise pseudo/directcolor
		695	* visuals if it can't deal with the palette.
		696	*/
		697	if (WARN_ON(!fb_helper->funcs->gamma_set \|\|
		698	!fb_helper->funcs->gamma_get))
		699	return -EINVAL;
		700
1221	serge	701	pindex = regno;
		702
		703	if (fb->bits_per_pixel == 16) {
		704	pindex = regno << 3;
		705
		706	if (fb->depth == 16 && regno > 63)
1246	serge	707	return -EINVAL;
1221	serge	708	if (fb->depth == 15 && regno > 31)
1246	serge	709	return -EINVAL;
1221	serge	710
		711	if (fb->depth == 16) {
		712	u16 r, g, b;
		713	int i;
		714	if (regno < 32) {
		715	for (i = 0; i < 8; i++)
		716	fb_helper->funcs->gamma_set(crtc, red,
		717	green, blue, pindex + i);
		718	}
		719
		720	fb_helper->funcs->gamma_get(crtc, &r,
		721	&g, &b,
		722	pindex >> 1);
		723
		724	for (i = 0; i < 4; i++)
		725	fb_helper->funcs->gamma_set(crtc, r,
		726	green, b,
		727	(pindex >> 1) + i);
		728	}
		729	}
		730
		731	if (fb->depth != 16)
		732	fb_helper->funcs->gamma_set(crtc, red, green, blue, pindex);
1246	serge	733	return 0;
1221	serge	734	}
		735
3480	Serge	736	/**
		737	* drm_fb_helper_setcmap - implementation for ->fb_setcmap
		738	* @cmap: cmap to set
		739	* @info: fbdev registered by the helper
		740	*/
1221	serge	741	int drm_fb_helper_setcmap(struct fb_cmap cmap, struct fb_info info)
		742	{
		743	struct drm_fb_helper *fb_helper = info->par;
4104	Serge	744	struct drm_device *dev = fb_helper->dev;
6084	serge	745	const struct drm_crtc_helper_funcs *crtc_funcs;
1221	serge	746	u16 red, green, blue, transp;
		747	struct drm_crtc *crtc;
1963	serge	748	int i, j, rc = 0;
1221	serge	749	int start;
		750
6084	serge	751	if (oops_in_progress)
		752	return -EBUSY;
		753
4104	Serge	754	drm_modeset_lock_all(dev);
		755	if (!drm_fb_helper_is_bound(fb_helper)) {
		756	drm_modeset_unlock_all(dev);
		757	return -EBUSY;
		758	}
		759
6084	serge	760	for (i = 0; i < fb_helper->crtc_count; i++) {
1963	serge	761	crtc = fb_helper->crtc_info[i].mode_set.crtc;
		762	crtc_funcs = crtc->helper_private;
1221	serge	763
		764	red = cmap->red;
		765	green = cmap->green;
		766	blue = cmap->blue;
		767	transp = cmap->transp;
		768	start = cmap->start;
		769
1963	serge	770	for (j = 0; j < cmap->len; j++) {
1221	serge	771	u16 hred, hgreen, hblue, htransp = 0xffff;
		772
		773	hred = *red++;
		774	hgreen = *green++;
		775	hblue = *blue++;
		776
		777	if (transp)
		778	htransp = *transp++;
		779
1246	serge	780	rc = setcolreg(crtc, hred, hgreen, hblue, start++, info);
		781	if (rc)
4104	Serge	782	goto out;
1221	serge	783	}
4104	Serge	784	if (crtc_funcs->load_lut)
6084	serge	785	crtc_funcs->load_lut(crtc);
1221	serge	786	}
4104	Serge	787	out:
		788	drm_modeset_unlock_all(dev);
1221	serge	789	return rc;
		790	}
		791	EXPORT_SYMBOL(drm_fb_helper_setcmap);
		792
3480	Serge	793	/**
		794	* drm_fb_helper_check_var - implementation for ->fb_check_var
		795	* @var: screeninfo to check
		796	* @info: fbdev registered by the helper
		797	*/
1179	serge	798	int drm_fb_helper_check_var(struct fb_var_screeninfo *var,
		799	struct fb_info *info)
		800	{
		801	struct drm_fb_helper *fb_helper = info->par;
		802	struct drm_framebuffer *fb = fb_helper->fb;
		803	int depth;
		804
1963	serge	805	if (var->pixclock != 0 \|\| in_dbg_master())
1179	serge	806	return -EINVAL;
		807
		808	/* Need to resize the fb object !!! */
3031	serge	809	if (var->bits_per_pixel > fb->bits_per_pixel \|\|
		810	var->xres > fb->width \|\| var->yres > fb->height \|\|
		811	var->xres_virtual > fb->width \|\| var->yres_virtual > fb->height) {
1404	serge	812	DRM_DEBUG("fb userspace requested width/height/bpp is greater than current fb "
3031	serge	813	"request %dx%d-%d (virtual %dx%d) > %dx%d-%d\n",
		814	var->xres, var->yres, var->bits_per_pixel,
		815	var->xres_virtual, var->yres_virtual,
1404	serge	816	fb->width, fb->height, fb->bits_per_pixel);
1179	serge	817	return -EINVAL;
		818	}
		819
		820	switch (var->bits_per_pixel) {
		821	case 16:
		822	depth = (var->green.length == 6) ? 16 : 15;
		823	break;
		824	case 32:
		825	depth = (var->transp.length > 0) ? 32 : 24;
		826	break;
		827	default:
		828	depth = var->bits_per_pixel;
		829	break;
		830	}
		831
		832	switch (depth) {
		833	case 8:
		834	var->red.offset = 0;
		835	var->green.offset = 0;
		836	var->blue.offset = 0;
		837	var->red.length = 8;
		838	var->green.length = 8;
		839	var->blue.length = 8;
		840	var->transp.length = 0;
		841	var->transp.offset = 0;
		842	break;
		843	case 15:
		844	var->red.offset = 10;
		845	var->green.offset = 5;
		846	var->blue.offset = 0;
		847	var->red.length = 5;
		848	var->green.length = 5;
		849	var->blue.length = 5;
		850	var->transp.length = 1;
		851	var->transp.offset = 15;
		852	break;
		853	case 16:
		854	var->red.offset = 11;
		855	var->green.offset = 5;
		856	var->blue.offset = 0;
		857	var->red.length = 5;
		858	var->green.length = 6;
		859	var->blue.length = 5;
		860	var->transp.length = 0;
		861	var->transp.offset = 0;
		862	break;
		863	case 24:
		864	var->red.offset = 16;
		865	var->green.offset = 8;
		866	var->blue.offset = 0;
		867	var->red.length = 8;
		868	var->green.length = 8;
		869	var->blue.length = 8;
		870	var->transp.length = 0;
		871	var->transp.offset = 0;
		872	break;
		873	case 32:
		874	var->red.offset = 16;
		875	var->green.offset = 8;
		876	var->blue.offset = 0;
		877	var->red.length = 8;
		878	var->green.length = 8;
		879	var->blue.length = 8;
		880	var->transp.length = 8;
		881	var->transp.offset = 24;
		882	break;
		883	default:
		884	return -EINVAL;
		885	}
		886	return 0;
		887	}
		888	EXPORT_SYMBOL(drm_fb_helper_check_var);
		889
3480	Serge	890	/**
		891	* drm_fb_helper_set_par - implementation for ->fb_set_par
		892	* @info: fbdev registered by the helper
		893	*
		894	* This will let fbcon do the mode init and is called at initialization time by
		895	* the fbdev core when registering the driver, and later on through the hotplug
		896	* callback.
		897	*/
1179	serge	898	int drm_fb_helper_set_par(struct fb_info *info)
		899	{
		900	struct drm_fb_helper *fb_helper = info->par;
		901	struct fb_var_screeninfo *var = &info->var;
		902
6084	serge	903	if (oops_in_progress)
		904	return -EBUSY;
		905
1313	serge	906	if (var->pixclock != 0) {
1430	serge	907	DRM_ERROR("PIXEL CLOCK SET\n");
1179	serge	908	return -EINVAL;
		909	}
		910
5060	serge	911	drm_fb_helper_restore_fbdev_mode_unlocked(fb_helper);
1963	serge	912
1179	serge	913	return 0;
		914	}
		915	EXPORT_SYMBOL(drm_fb_helper_set_par);
		916
6084	serge	917	static int pan_display_atomic(struct fb_var_screeninfo *var,
		918	struct fb_info *info)
		919	{
		920	struct drm_fb_helper *fb_helper = info->par;
		921	struct drm_device *dev = fb_helper->dev;
		922	struct drm_atomic_state *state;
		923	struct drm_plane *plane;
		924	int i, ret;
		925	unsigned plane_mask;
		926
		927	state = drm_atomic_state_alloc(dev);
		928	if (!state)
		929	return -ENOMEM;
		930
		931	state->acquire_ctx = dev->mode_config.acquire_ctx;
		932	retry:
		933	plane_mask = 0;
		934	for(i = 0; i < fb_helper->crtc_count; i++) {
		935	struct drm_mode_set *mode_set;
		936
		937	mode_set = &fb_helper->crtc_info[i].mode_set;
		938
		939	mode_set->x = var->xoffset;
		940	mode_set->y = var->yoffset;
		941
		942	ret = __drm_atomic_helper_set_config(mode_set, state);
		943	if (ret != 0)
		944	goto fail;
		945
		946	plane = mode_set->crtc->primary;
		947	plane_mask \|= drm_plane_index(plane);
		948	plane->old_fb = plane->fb;
		949	}
		950
		951	ret = drm_atomic_commit(state);
		952	if (ret != 0)
		953	goto fail;
		954
		955	info->var.xoffset = var->xoffset;
		956	info->var.yoffset = var->yoffset;
		957
		958
		959	fail:
		960	drm_atomic_clean_old_fb(dev, plane_mask, ret);
		961
		962	if (ret == -EDEADLK)
		963	goto backoff;
		964
		965	if (ret != 0)
		966	drm_atomic_state_free(state);
		967
		968	return ret;
		969
		970	backoff:
		971	drm_atomic_state_clear(state);
		972	drm_atomic_legacy_backoff(state);
		973
		974	goto retry;
		975	}
		976
3480	Serge	977	/**
		978	* drm_fb_helper_pan_display - implementation for ->fb_pan_display
		979	* @var: updated screen information
		980	* @info: fbdev registered by the helper
		981	*/
1179	serge	982	int drm_fb_helper_pan_display(struct fb_var_screeninfo *var,
		983	struct fb_info *info)
		984	{
		985	struct drm_fb_helper *fb_helper = info->par;
		986	struct drm_device *dev = fb_helper->dev;
		987	struct drm_mode_set *modeset;
		988	int ret = 0;
		989	int i;
		990
6084	serge	991	if (oops_in_progress)
		992	return -EBUSY;
		993
3480	Serge	994	drm_modeset_lock_all(dev);
		995	if (!drm_fb_helper_is_bound(fb_helper)) {
		996	drm_modeset_unlock_all(dev);
		997	return -EBUSY;
		998	}
		999
6084	serge	1000	if (fb_helper->atomic) {
		1001	ret = pan_display_atomic(var, info);
		1002	goto unlock;
		1003	}
		1004
		1005	for (i = 0; i < fb_helper->crtc_count; i++) {
1179	serge	1006	modeset = &fb_helper->crtc_info[i].mode_set;
		1007
		1008	modeset->x = var->xoffset;
		1009	modeset->y = var->yoffset;
		1010
		1011	if (modeset->num_connectors) {
3480	Serge	1012	ret = drm_mode_set_config_internal(modeset);
1179	serge	1013	if (!ret) {
		1014	info->var.xoffset = var->xoffset;
		1015	info->var.yoffset = var->yoffset;
		1016	}
		1017	}
		1018	}
6084	serge	1019	unlock:
3480	Serge	1020	drm_modeset_unlock_all(dev);
1179	serge	1021	return ret;
		1022	}
		1023	EXPORT_SYMBOL(drm_fb_helper_pan_display);
		1024
3480	Serge	1025	/*
		1026	* Allocates the backing storage and sets up the fbdev info structure through
		1027	* the ->fb_probe callback and then registers the fbdev and sets up the panic
		1028	* notifier.
		1029	*/
		1030	static int drm_fb_helper_single_fb_probe(struct drm_fb_helper *fb_helper,
6084	serge	1031	int preferred_bpp)
1179	serge	1032	{
3480	Serge	1033	int ret = 0;
1179	serge	1034	int crtc_count = 0;
1963	serge	1035	int i;
1179	serge	1036	struct fb_info *info;
1963	serge	1037	struct drm_fb_helper_surface_size sizes;
		1038	int gamma_size = 0;
1179	serge	1039
1963	serge	1040	memset(&sizes, 0, sizeof(struct drm_fb_helper_surface_size));
		1041	sizes.surface_depth = 24;
		1042	sizes.surface_bpp = 32;
		1043	sizes.fb_width = (unsigned)-1;
		1044	sizes.fb_height = (unsigned)-1;
1221	serge	1045
3031	serge	1046	/* if driver picks 8 or 16 by default use that
		1047	for both depth/bpp */
3192	Serge	1048	if (preferred_bpp != sizes.surface_bpp)
3031	serge	1049	sizes.surface_depth = sizes.surface_bpp = preferred_bpp;
3192	Serge	1050
3031	serge	1051	/* first up get a count of crtcs now in use and new min/maxes width/heights */
		1052	for (i = 0; i < fb_helper->connector_count; i++) {
		1053	struct drm_fb_helper_connector *fb_helper_conn = fb_helper->connector_info[i];
		1054	struct drm_cmdline_mode *cmdline_mode;
		1055
5271	serge	1056	cmdline_mode = &fb_helper_conn->connector->cmdline_mode;
3031	serge	1057
		1058	if (cmdline_mode->bpp_specified) {
		1059	switch (cmdline_mode->bpp) {
		1060	case 8:
		1061	sizes.surface_depth = sizes.surface_bpp = 8;
		1062	break;
		1063	case 15:
		1064	sizes.surface_depth = 15;
		1065	sizes.surface_bpp = 16;
		1066	break;
		1067	case 16:
		1068	sizes.surface_depth = sizes.surface_bpp = 16;
		1069	break;
		1070	case 24:
		1071	sizes.surface_depth = sizes.surface_bpp = 24;
		1072	break;
		1073	case 32:
6084	serge	1074	sizes.surface_depth = 24;
		1075	sizes.surface_bpp = 32;
3031	serge	1076	break;
		1077	}
		1078	break;
		1079	}
		1080	}
1221	serge	1081
1963	serge	1082	crtc_count = 0;
		1083	for (i = 0; i < fb_helper->crtc_count; i++) {
		1084	struct drm_display_mode *desired_mode;
6084	serge	1085	struct drm_mode_set *mode_set;
		1086	int x, y, j;
		1087	/* in case of tile group, are we the last tile vert or horiz?
		1088	* If no tile group you are always the last one both vertically
		1089	* and horizontally
		1090	*/
		1091	bool lastv = true, lasth = true;
		1092
1963	serge	1093	desired_mode = fb_helper->crtc_info[i].desired_mode;
6084	serge	1094	mode_set = &fb_helper->crtc_info[i].mode_set;
		1095
		1096	if (!desired_mode)
		1097	continue;
		1098
		1099	crtc_count++;
		1100
5271	serge	1101	x = fb_helper->crtc_info[i].x;
		1102	y = fb_helper->crtc_info[i].y;
6084	serge	1103
		1104	if (gamma_size == 0)
		1105	gamma_size = fb_helper->crtc_info[i].mode_set.crtc->gamma_size;
		1106
		1107	sizes.surface_width = max_t(u32, desired_mode->hdisplay + x, sizes.surface_width);
		1108	sizes.surface_height = max_t(u32, desired_mode->vdisplay + y, sizes.surface_height);
		1109
		1110	for (j = 0; j < mode_set->num_connectors; j++) {
		1111	struct drm_connector *connector = mode_set->connectors[j];
		1112	if (connector->has_tile) {
		1113	lasth = (connector->tile_h_loc == (connector->num_h_tile - 1));
		1114	lastv = (connector->tile_v_loc == (connector->num_v_tile - 1));
		1115	/* cloning to multiple tiles is just crazy-talk, so: */
		1116	break;
		1117	}
		1118	}
		1119
		1120	if (lasth)
		1121	sizes.fb_width = min_t(u32, desired_mode->hdisplay + x, sizes.fb_width);
		1122	if (lastv)
		1123	sizes.fb_height = min_t(u32, desired_mode->vdisplay + y, sizes.fb_height);
1179	serge	1124	}
		1125
1963	serge	1126	if (crtc_count == 0 \|\| sizes.fb_width == -1 \|\| sizes.fb_height == -1) {
1179	serge	1127	/* hmm everyone went away - assume VGA cable just fell out
		1128	and will come back later. */
1963	serge	1129	DRM_INFO("Cannot find any crtc or sizes - going 1024x768\n");
		1130	sizes.fb_width = sizes.surface_width = 1024;
		1131	sizes.fb_height = sizes.surface_height = 768;
1179	serge	1132	}
		1133
1963	serge	1134	/* push down into drivers */
3480	Serge	1135	ret = (*fb_helper->funcs->fb_probe)(fb_helper, &sizes);
		1136	if (ret < 0)
		1137	return ret;
1179	serge	1138
1963	serge	1139	info = fb_helper->fbdev;
1179	serge	1140
3480	Serge	1141	/*
		1142	* Set the fb pointer - usually drm_setup_crtcs does this for hotplug
		1143	* events, but at init time drm_setup_crtcs needs to be called before
		1144	* the fb is allocated (since we need to figure out the desired size of
		1145	* the fb before we can allocate it ...). Hence we need to fix things up
		1146	* here again.
		1147	*/
3192	Serge	1148	for (i = 0; i < fb_helper->crtc_count; i++)
3480	Serge	1149	if (fb_helper->crtc_info[i].mode_set.num_connectors)
6084	serge	1150	fb_helper->crtc_info[i].mode_set.fb = fb_helper->fb;
1179	serge	1151
3480	Serge	1152
6084	serge	1153	info->var.pixclock = 0;
		1154
5271	serge	1155	dev_info(fb_helper->dev->dev, "fb%d: %s frame buffer device\n",
		1156	info->node, info->fix.id);
1963	serge	1157
		1158
6084	serge	1159	list_add(&fb_helper->kernel_fb_list, &kernel_fb_helper_list);
		1160
1179	serge	1161	return 0;
		1162	}
		1163
3480	Serge	1164	/**
		1165	* drm_fb_helper_fill_fix - initializes fixed fbdev information
		1166	* @info: fbdev registered by the helper
		1167	* @pitch: desired pitch
		1168	* @depth: desired depth
		1169	*
		1170	* Helper to fill in the fixed fbdev information useful for a non-accelerated
		1171	* fbdev emulations. Drivers which support acceleration methods which impose
		1172	* additional constraints need to set up their own limits.
		1173	*
		1174	* Drivers should call this (or their equivalent setup code) from their
		1175	* ->fb_probe callback.
		1176	*/
1221	serge	1177	void drm_fb_helper_fill_fix(struct fb_info *info, uint32_t pitch,
		1178	uint32_t depth)
1179	serge	1179	{
		1180	info->fix.type = FB_TYPE_PACKED_PIXELS;
1221	serge	1181	info->fix.visual = depth == 8 ? FB_VISUAL_PSEUDOCOLOR :
1246	serge	1182	FB_VISUAL_TRUECOLOR;
1963	serge	1183	info->fix.mmio_start = 0;
		1184	info->fix.mmio_len = 0;
1179	serge	1185	info->fix.type_aux = 0;
		1186	info->fix.xpanstep = 1; /* doing it in hw */
		1187	info->fix.ypanstep = 1; /* doing it in hw */
		1188	info->fix.ywrapstep = 0;
		1189	info->fix.accel = FB_ACCEL_NONE;
		1190
		1191	info->fix.line_length = pitch;
		1192	return;
		1193	}
		1194	EXPORT_SYMBOL(drm_fb_helper_fill_fix);
		1195
3480	Serge	1196	/**
		1197	* drm_fb_helper_fill_var - initalizes variable fbdev information
		1198	* @info: fbdev instance to set up
		1199	* @fb_helper: fb helper instance to use as template
		1200	* @fb_width: desired fb width
		1201	* @fb_height: desired fb height
		1202	*
		1203	* Sets up the variable fbdev metainformation from the given fb helper instance
		1204	* and the drm framebuffer allocated in fb_helper->fb.
		1205	*
		1206	* Drivers should call this (or their equivalent setup code) from their
		1207	* ->fb_probe callback after having allocated the fbdev backing
		1208	* storage framebuffer.
		1209	*/
1963	serge	1210	void drm_fb_helper_fill_var(struct fb_info info, struct drm_fb_helper fb_helper,
1179	serge	1211	uint32_t fb_width, uint32_t fb_height)
		1212	{
1963	serge	1213	struct drm_framebuffer *fb = fb_helper->fb;
		1214	info->pseudo_palette = fb_helper->pseudo_palette;
1179	serge	1215	info->var.xres_virtual = fb->width;
		1216	info->var.yres_virtual = fb->height;
		1217	info->var.bits_per_pixel = fb->bits_per_pixel;
1963	serge	1218	info->var.accel_flags = FB_ACCELF_TEXT;
1179	serge	1219	info->var.xoffset = 0;
		1220	info->var.yoffset = 0;
		1221	info->var.activate = FB_ACTIVATE_NOW;
		1222	info->var.height = -1;
		1223	info->var.width = -1;
		1224
		1225	switch (fb->depth) {
		1226	case 8:
		1227	info->var.red.offset = 0;
		1228	info->var.green.offset = 0;
		1229	info->var.blue.offset = 0;
		1230	info->var.red.length = 8; /* 8bit DAC */
		1231	info->var.green.length = 8;
		1232	info->var.blue.length = 8;
		1233	info->var.transp.offset = 0;
		1234	info->var.transp.length = 0;
		1235	break;
		1236	case 15:
		1237	info->var.red.offset = 10;
		1238	info->var.green.offset = 5;
		1239	info->var.blue.offset = 0;
		1240	info->var.red.length = 5;
		1241	info->var.green.length = 5;
		1242	info->var.blue.length = 5;
		1243	info->var.transp.offset = 15;
		1244	info->var.transp.length = 1;
		1245	break;
		1246	case 16:
		1247	info->var.red.offset = 11;
		1248	info->var.green.offset = 5;
		1249	info->var.blue.offset = 0;
		1250	info->var.red.length = 5;
		1251	info->var.green.length = 6;
		1252	info->var.blue.length = 5;
		1253	info->var.transp.offset = 0;
		1254	break;
		1255	case 24:
		1256	info->var.red.offset = 16;
		1257	info->var.green.offset = 8;
		1258	info->var.blue.offset = 0;
		1259	info->var.red.length = 8;
		1260	info->var.green.length = 8;
		1261	info->var.blue.length = 8;
		1262	info->var.transp.offset = 0;
		1263	info->var.transp.length = 0;
		1264	break;
		1265	case 32:
		1266	info->var.red.offset = 16;
		1267	info->var.green.offset = 8;
		1268	info->var.blue.offset = 0;
		1269	info->var.red.length = 8;
		1270	info->var.green.length = 8;
		1271	info->var.blue.length = 8;
		1272	info->var.transp.offset = 24;
		1273	info->var.transp.length = 8;
		1274	break;
		1275	default:
		1276	break;
		1277	}
		1278
		1279	info->var.xres = fb_width;
		1280	info->var.yres = fb_height;
		1281	}
		1282	EXPORT_SYMBOL(drm_fb_helper_fill_var);
1963	serge	1283
		1284	static int drm_fb_helper_probe_connector_modes(struct drm_fb_helper *fb_helper,
		1285	uint32_t maxX,
		1286	uint32_t maxY)
		1287	{
		1288	struct drm_connector *connector;
		1289	int count = 0;
		1290	int i;
		1291
		1292	for (i = 0; i < fb_helper->connector_count; i++) {
		1293	connector = fb_helper->connector_info[i]->connector;
		1294	count += connector->funcs->fill_modes(connector, maxX, maxY);
		1295	}
		1296
		1297	return count;
		1298	}
		1299
5060	serge	1300	struct drm_display_mode drm_has_preferred_mode(struct drm_fb_helper_connector fb_connector, int width, int height)
1963	serge	1301	{
		1302	struct drm_display_mode *mode;
		1303
		1304	list_for_each_entry(mode, &fb_connector->connector->modes, head) {
5060	serge	1305	if (mode->hdisplay > width \|\|
		1306	mode->vdisplay > height)
1963	serge	1307	continue;
		1308	if (mode->type & DRM_MODE_TYPE_PREFERRED)
		1309	return mode;
		1310	}
		1311	return NULL;
		1312	}
5060	serge	1313	EXPORT_SYMBOL(drm_has_preferred_mode);
1963	serge	1314
		1315	static bool drm_has_cmdline_mode(struct drm_fb_helper_connector *fb_connector)
		1316	{
5271	serge	1317	return fb_connector->connector->cmdline_mode.specified;
1963	serge	1318	}
		1319
5060	serge	1320	struct drm_display_mode drm_pick_cmdline_mode(struct drm_fb_helper_connector fb_helper_conn,
3746	Serge	1321	int width, int height)
		1322	{
		1323	struct drm_cmdline_mode *cmdline_mode;
6084	serge	1324	struct drm_display_mode *mode;
5060	serge	1325	bool prefer_non_interlace;
1963	serge	1326
6084	serge	1327	cmdline_mode = &fb_helper_conn->connector->cmdline_mode;
3746	Serge	1328	if (cmdline_mode->specified == false)
6088	serge	1329	return NULL;
3746	Serge	1330
		1331	/* attempt to find a matching mode in the list of modes
		1332	* we have gotten so far, if not add a CVT mode that conforms
		1333	*/
		1334	if (cmdline_mode->rb \|\| cmdline_mode->margins)
		1335	goto create_mode;
		1336
5060	serge	1337	prefer_non_interlace = !cmdline_mode->interlace;
6084	serge	1338	again:
3746	Serge	1339	list_for_each_entry(mode, &fb_helper_conn->connector->modes, head) {
		1340	/* check width/height */
		1341	if (mode->hdisplay != cmdline_mode->xres \|\|
		1342	mode->vdisplay != cmdline_mode->yres)
		1343	continue;
		1344
		1345	if (cmdline_mode->refresh_specified) {
		1346	if (mode->vrefresh != cmdline_mode->refresh)
		1347	continue;
		1348	}
		1349
		1350	if (cmdline_mode->interlace) {
		1351	if (!(mode->flags & DRM_MODE_FLAG_INTERLACE))
		1352	continue;
5060	serge	1353	} else if (prefer_non_interlace) {
		1354	if (mode->flags & DRM_MODE_FLAG_INTERLACE)
		1355	continue;
3746	Serge	1356	}
		1357	return mode;
		1358	}
		1359
5060	serge	1360	if (prefer_non_interlace) {
		1361	prefer_non_interlace = false;
		1362	goto again;
		1363	}
		1364
3746	Serge	1365	create_mode:
		1366	mode = drm_mode_create_from_cmdline_mode(fb_helper_conn->connector->dev,
		1367	cmdline_mode);
		1368	list_add(&mode->head, &fb_helper_conn->connector->modes);
		1369	return mode;
		1370	}
5060	serge	1371	EXPORT_SYMBOL(drm_pick_cmdline_mode);
3746	Serge	1372
1963	serge	1373	static bool drm_connector_enabled(struct drm_connector *connector, bool strict)
		1374	{
		1375	bool enable;
		1376
3192	Serge	1377	if (strict)
1963	serge	1378	enable = connector->status == connector_status_connected;
3192	Serge	1379	else
1963	serge	1380	enable = connector->status != connector_status_disconnected;
3192	Serge	1381
1963	serge	1382	return enable;
		1383	}
		1384
		1385	static void drm_enable_connectors(struct drm_fb_helper *fb_helper,
		1386	bool *enabled)
		1387	{
		1388	bool any_enabled = false;
		1389	struct drm_connector *connector;
		1390	int i = 0;
		1391
		1392	for (i = 0; i < fb_helper->connector_count; i++) {
		1393	connector = fb_helper->connector_info[i]->connector;
		1394	enabled[i] = drm_connector_enabled(connector, true);
		1395	DRM_DEBUG_KMS("connector %d enabled? %s\n", connector->base.id,
		1396	enabled[i] ? "yes" : "no");
		1397	any_enabled \|= enabled[i];
		1398	}
		1399
		1400	if (any_enabled)
		1401	return;
		1402
		1403	for (i = 0; i < fb_helper->connector_count; i++) {
		1404	connector = fb_helper->connector_info[i]->connector;
		1405	enabled[i] = drm_connector_enabled(connector, false);
		1406	}
		1407	}
		1408
3746	Serge	1409	static bool drm_target_cloned(struct drm_fb_helper *fb_helper,
		1410	struct drm_display_mode **modes,
5271	serge	1411	struct drm_fb_offset *offsets,
3746	Serge	1412	bool *enabled, int width, int height)
		1413	{
		1414	int count, i, j;
		1415	bool can_clone = false;
		1416	struct drm_fb_helper_connector *fb_helper_conn;
		1417	struct drm_display_mode dmt_mode, mode;
1963	serge	1418
3746	Serge	1419	/* only contemplate cloning in the single crtc case */
		1420	if (fb_helper->crtc_count > 1)
		1421	return false;
		1422
		1423	count = 0;
		1424	for (i = 0; i < fb_helper->connector_count; i++) {
		1425	if (enabled[i])
		1426	count++;
		1427	}
		1428
		1429	/* only contemplate cloning if more than one connector is enabled */
		1430	if (count <= 1)
		1431	return false;
		1432
		1433	/* check the command line or if nothing common pick 1024x768 */
		1434	can_clone = true;
		1435	for (i = 0; i < fb_helper->connector_count; i++) {
		1436	if (!enabled[i])
		1437	continue;
		1438	fb_helper_conn = fb_helper->connector_info[i];
		1439	modes[i] = drm_pick_cmdline_mode(fb_helper_conn, width, height);
		1440	if (!modes[i]) {
		1441	can_clone = false;
		1442	break;
		1443	}
		1444	for (j = 0; j < i; j++) {
		1445	if (!enabled[j])
		1446	continue;
		1447	if (!drm_mode_equal(modes[j], modes[i]))
		1448	can_clone = false;
		1449	}
		1450	}
		1451
		1452	if (can_clone) {
		1453	DRM_DEBUG_KMS("can clone using command line\n");
		1454	return true;
		1455	}
		1456
		1457	/* try and find a 1024x768 mode on each connector */
		1458	can_clone = true;
		1459	dmt_mode = drm_mode_find_dmt(fb_helper->dev, 1024, 768, 60, false);
		1460
		1461	for (i = 0; i < fb_helper->connector_count; i++) {
		1462
		1463	if (!enabled[i])
		1464	continue;
		1465
		1466	fb_helper_conn = fb_helper->connector_info[i];
		1467	list_for_each_entry(mode, &fb_helper_conn->connector->modes, head) {
		1468	if (drm_mode_equal(mode, dmt_mode))
		1469	modes[i] = mode;
		1470	}
		1471	if (!modes[i])
		1472	can_clone = false;
		1473	}
		1474
		1475	if (can_clone) {
		1476	DRM_DEBUG_KMS("can clone using 1024x768\n");
		1477	return true;
		1478	}
		1479	DRM_INFO("kms: can't enable cloning when we probably wanted to.\n");
		1480	return false;
		1481	}
		1482
5271	serge	1483	static int drm_get_tile_offsets(struct drm_fb_helper *fb_helper,
		1484	struct drm_display_mode **modes,
		1485	struct drm_fb_offset *offsets,
		1486	int idx,
		1487	int h_idx, int v_idx)
		1488	{
		1489	struct drm_fb_helper_connector *fb_helper_conn;
		1490	int i;
		1491	int hoffset = 0, voffset = 0;
		1492
		1493	for (i = 0; i < fb_helper->connector_count; i++) {
		1494	fb_helper_conn = fb_helper->connector_info[i];
		1495	if (!fb_helper_conn->connector->has_tile)
		1496	continue;
		1497
		1498	if (!modes[i] && (h_idx \|\| v_idx)) {
		1499	DRM_DEBUG_KMS("no modes for connector tiled %d %d\n", i,
		1500	fb_helper_conn->connector->base.id);
		1501	continue;
		1502	}
		1503	if (fb_helper_conn->connector->tile_h_loc < h_idx)
		1504	hoffset += modes[i]->hdisplay;
		1505
		1506	if (fb_helper_conn->connector->tile_v_loc < v_idx)
		1507	voffset += modes[i]->vdisplay;
		1508	}
		1509	offsets[idx].x = hoffset;
		1510	offsets[idx].y = voffset;
		1511	DRM_DEBUG_KMS("returned %d %d for %d %d\n", hoffset, voffset, h_idx, v_idx);
		1512	return 0;
		1513	}
		1514
1963	serge	1515	static bool drm_target_preferred(struct drm_fb_helper *fb_helper,
		1516	struct drm_display_mode **modes,
5271	serge	1517	struct drm_fb_offset *offsets,
1963	serge	1518	bool *enabled, int width, int height)
		1519	{
		1520	struct drm_fb_helper_connector *fb_helper_conn;
		1521	int i;
5271	serge	1522	uint64_t conn_configured = 0, mask;
		1523	int tile_pass = 0;
		1524	mask = (1 << fb_helper->connector_count) - 1;
		1525	retry:
1963	serge	1526	for (i = 0; i < fb_helper->connector_count; i++) {
		1527	fb_helper_conn = fb_helper->connector_info[i];
		1528
5271	serge	1529	if (conn_configured & (1 << i))
1963	serge	1530	continue;
		1531
5271	serge	1532	if (enabled[i] == false) {
		1533	conn_configured \|= (1 << i);
		1534	continue;
		1535	}
		1536
		1537	/* first pass over all the untiled connectors */
		1538	if (tile_pass == 0 && fb_helper_conn->connector->has_tile)
		1539	continue;
		1540
		1541	if (tile_pass == 1) {
		1542	if (fb_helper_conn->connector->tile_h_loc != 0 \|\|
		1543	fb_helper_conn->connector->tile_v_loc != 0)
6084	serge	1544	continue;
5271	serge	1545
		1546	} else {
		1547	if (fb_helper_conn->connector->tile_h_loc != tile_pass -1 &&
		1548	fb_helper_conn->connector->tile_v_loc != tile_pass - 1)
		1549	/* if this tile_pass doesn't cover any of the tiles - keep going */
		1550	continue;
		1551
		1552	/* find the tile offsets for this pass - need
		1553	to find all tiles left and above */
		1554	drm_get_tile_offsets(fb_helper, modes, offsets,
		1555	i, fb_helper_conn->connector->tile_h_loc, fb_helper_conn->connector->tile_v_loc);
		1556	}
1963	serge	1557	DRM_DEBUG_KMS("looking for cmdline mode on connector %d\n",
		1558	fb_helper_conn->connector->base.id);
		1559
		1560	/* got for command line mode first */
3746	Serge	1561	modes[i] = drm_pick_cmdline_mode(fb_helper_conn, width, height);
1963	serge	1562	if (!modes[i]) {
5271	serge	1563	DRM_DEBUG_KMS("looking for preferred mode on connector %d %d\n",
		1564	fb_helper_conn->connector->base.id, fb_helper_conn->connector->tile_group ? fb_helper_conn->connector->tile_group->id : 0);
1963	serge	1565	modes[i] = drm_has_preferred_mode(fb_helper_conn, width, height);
		1566	}
		1567	/* No preferred modes, pick one off the list */
		1568	if (!modes[i] && !list_empty(&fb_helper_conn->connector->modes)) {
		1569	list_for_each_entry(modes[i], &fb_helper_conn->connector->modes, head)
		1570	break;
		1571	}
		1572	DRM_DEBUG_KMS("found mode %s\n", modes[i] ? modes[i]->name :
		1573	"none");
5271	serge	1574	conn_configured \|= (1 << i);
1963	serge	1575	}
5271	serge	1576
		1577	if ((conn_configured & mask) != mask) {
		1578	tile_pass++;
		1579	goto retry;
		1580	}
1963	serge	1581	return true;
		1582	}
		1583
		1584	static int drm_pick_crtcs(struct drm_fb_helper *fb_helper,
		1585	struct drm_fb_helper_crtc **best_crtcs,
		1586	struct drm_display_mode **modes,
		1587	int n, int width, int height)
		1588	{
		1589	int c, o;
		1590	struct drm_connector *connector;
6084	serge	1591	const struct drm_connector_helper_funcs *connector_funcs;
1963	serge	1592	struct drm_encoder *encoder;
		1593	int my_score, best_score, score;
		1594	struct drm_fb_helper_crtc *crtcs, crtc;
		1595	struct drm_fb_helper_connector *fb_helper_conn;
		1596
		1597	if (n == fb_helper->connector_count)
		1598	return 0;
		1599
		1600	fb_helper_conn = fb_helper->connector_info[n];
		1601	connector = fb_helper_conn->connector;
		1602
		1603	best_crtcs[n] = NULL;
		1604	best_score = drm_pick_crtcs(fb_helper, best_crtcs, modes, n+1, width, height);
		1605	if (modes[n] == NULL)
		1606	return best_score;
		1607
6660	serge	1608	crtcs = kzalloc(fb_helper->connector_count *
1963	serge	1609	sizeof(struct drm_fb_helper_crtc *), GFP_KERNEL);
		1610	if (!crtcs)
		1611	return best_score;
		1612
		1613	my_score = 1;
		1614	if (connector->status == connector_status_connected)
		1615	my_score++;
		1616	if (drm_has_cmdline_mode(fb_helper_conn))
		1617	my_score++;
		1618	if (drm_has_preferred_mode(fb_helper_conn, width, height))
		1619	my_score++;
		1620
		1621	connector_funcs = connector->helper_private;
		1622	encoder = connector_funcs->best_encoder(connector);
		1623	if (!encoder)
		1624	goto out;
		1625
		1626	/* select a crtc for this connector and then attempt to configure
		1627	remaining connectors */
		1628	for (c = 0; c < fb_helper->crtc_count; c++) {
		1629	crtc = &fb_helper->crtc_info[c];
		1630
3192	Serge	1631	if ((encoder->possible_crtcs & (1 << c)) == 0)
1963	serge	1632	continue;
		1633
		1634	for (o = 0; o < n; o++)
		1635	if (best_crtcs[o] == crtc)
		1636	break;
		1637
		1638	if (o < n) {
		1639	/* ignore cloning unless only a single crtc */
		1640	if (fb_helper->crtc_count > 1)
		1641	continue;
		1642
		1643	if (!drm_mode_equal(modes[o], modes[n]))
		1644	continue;
		1645	}
		1646
		1647	crtcs[n] = crtc;
		1648	memcpy(crtcs, best_crtcs, n * sizeof(struct drm_fb_helper_crtc *));
		1649	score = my_score + drm_pick_crtcs(fb_helper, crtcs, modes, n + 1,
		1650	width, height);
		1651	if (score > best_score) {
		1652	best_score = score;
		1653	memcpy(best_crtcs, crtcs,
6660	serge	1654	fb_helper->connector_count *
1963	serge	1655	sizeof(struct drm_fb_helper_crtc *));
		1656	}
		1657	}
		1658	out:
		1659	kfree(crtcs);
		1660	return best_score;
		1661	}
		1662
		1663	static void drm_setup_crtcs(struct drm_fb_helper *fb_helper)
		1664	{
		1665	struct drm_device *dev = fb_helper->dev;
		1666	struct drm_fb_helper_crtc **crtcs;
		1667	struct drm_display_mode **modes;
5271	serge	1668	struct drm_fb_offset *offsets;
1963	serge	1669	struct drm_mode_set *modeset;
		1670	bool *enabled;
		1671	int width, height;
3746	Serge	1672	int i;
1963	serge	1673
		1674	DRM_DEBUG_KMS("\n");
		1675
		1676	width = dev->mode_config.max_width;
		1677	height = dev->mode_config.max_height;
		1678
		1679	crtcs = kcalloc(dev->mode_config.num_connector,
		1680	sizeof(struct drm_fb_helper_crtc *), GFP_KERNEL);
		1681	modes = kcalloc(dev->mode_config.num_connector,
		1682	sizeof(struct drm_display_mode *), GFP_KERNEL);
5271	serge	1683	offsets = kcalloc(dev->mode_config.num_connector,
		1684	sizeof(struct drm_fb_offset), GFP_KERNEL);
1963	serge	1685	enabled = kcalloc(dev->mode_config.num_connector,
		1686	sizeof(bool), GFP_KERNEL);
5271	serge	1687	if (!crtcs \|\| !modes \|\| !enabled \|\| !offsets) {
3192	Serge	1688	DRM_ERROR("Memory allocation failed\n");
		1689	goto out;
		1690	}
1963	serge	1691
3192	Serge	1692
1963	serge	1693	drm_enable_connectors(fb_helper, enabled);
		1694
3746	Serge	1695	if (!(fb_helper->funcs->initial_config &&
		1696	fb_helper->funcs->initial_config(fb_helper, crtcs, modes,
5271	serge	1697	offsets,
3746	Serge	1698	enabled, width, height))) {
		1699	memset(modes, 0, dev->mode_config.num_connector*sizeof(modes[0]));
		1700	memset(crtcs, 0, dev->mode_config.num_connector*sizeof(crtcs[0]));
5271	serge	1701	memset(offsets, 0, dev->mode_config.num_connector*sizeof(offsets[0]));
1963	serge	1702
5271	serge	1703	if (!drm_target_cloned(fb_helper, modes, offsets,
		1704	enabled, width, height) &&
		1705	!drm_target_preferred(fb_helper, modes, offsets,
		1706	enabled, width, height))
1963	serge	1707	DRM_ERROR("Unable to find initial modes\n");
		1708
3746	Serge	1709	DRM_DEBUG_KMS("picking CRTCs for %dx%d config\n",
		1710	width, height);
1963	serge	1711
6084	serge	1712	drm_pick_crtcs(fb_helper, crtcs, modes, 0, width, height);
3746	Serge	1713	}
1963	serge	1714
		1715	/* need to set the modesets up here for use later */
		1716	/* fill out the connector<->crtc mappings into the modesets */
		1717	for (i = 0; i < fb_helper->crtc_count; i++) {
		1718	modeset = &fb_helper->crtc_info[i].mode_set;
		1719	modeset->num_connectors = 0;
3480	Serge	1720	modeset->fb = NULL;
1963	serge	1721	}
		1722
		1723	for (i = 0; i < fb_helper->connector_count; i++) {
		1724	struct drm_display_mode *mode = modes[i];
		1725	struct drm_fb_helper_crtc *fb_crtc = crtcs[i];
5271	serge	1726	struct drm_fb_offset *offset = &offsets[i];
1963	serge	1727	modeset = &fb_crtc->mode_set;
		1728
		1729	if (mode && fb_crtc) {
5271	serge	1730	DRM_DEBUG_KMS("desired mode %s set on crtc %d (%d,%d)\n",
		1731	mode->name, fb_crtc->mode_set.crtc->base.id, offset->x, offset->y);
1963	serge	1732	fb_crtc->desired_mode = mode;
5271	serge	1733	fb_crtc->x = offset->x;
		1734	fb_crtc->y = offset->y;
1963	serge	1735	if (modeset->mode)
		1736	drm_mode_destroy(dev, modeset->mode);
		1737	modeset->mode = drm_mode_duplicate(dev,
		1738	fb_crtc->desired_mode);
		1739	modeset->connectors[modeset->num_connectors++] = fb_helper->connector_info[i]->connector;
3480	Serge	1740	modeset->fb = fb_helper->fb;
5271	serge	1741	modeset->x = offset->x;
		1742	modeset->y = offset->y;
1963	serge	1743	}
		1744	}
		1745
3480	Serge	1746	/* Clear out any old modes if there are no more connected outputs. */
		1747	for (i = 0; i < fb_helper->crtc_count; i++) {
		1748	modeset = &fb_helper->crtc_info[i].mode_set;
		1749	if (modeset->num_connectors == 0) {
		1750	BUG_ON(modeset->fb);
		1751	if (modeset->mode)
		1752	drm_mode_destroy(dev, modeset->mode);
		1753	modeset->mode = NULL;
		1754	}
		1755	}
3192	Serge	1756	out:
1963	serge	1757	kfree(crtcs);
		1758	kfree(modes);
5271	serge	1759	kfree(offsets);
1963	serge	1760	kfree(enabled);
		1761	}
		1762
		1763	/**
3480	Serge	1764	* drm_fb_helper_initial_config - setup a sane initial connector configuration
3192	Serge	1765	* @fb_helper: fb_helper device struct
		1766	* @bpp_sel: bpp value to use for the framebuffer configuration
1963	serge	1767	*
3192	Serge	1768	* Scans the CRTCs and connectors and tries to put together an initial setup.
1963	serge	1769	* At the moment, this is a cloned configuration across all heads with
		1770	* a new framebuffer object as the backing store.
		1771	*
3480	Serge	1772	* Note that this also registers the fbdev and so allows userspace to call into
		1773	* the driver through the fbdev interfaces.
		1774	*
		1775	* This function will call down into the ->fb_probe callback to let
		1776	* the driver allocate and initialize the fbdev info structure and the drm
		1777	* framebuffer used to back the fbdev. drm_fb_helper_fill_var() and
		1778	* drm_fb_helper_fill_fix() are provided as helpers to setup simple default
		1779	* values for the fbdev info structure.
		1780	*
1963	serge	1781	* RETURNS:
		1782	* Zero if everything went ok, nonzero otherwise.
		1783	*/
6084	serge	1784	int drm_fb_helper_initial_config(struct drm_fb_helper *fb_helper, int bpp_sel)
1963	serge	1785	{
		1786	struct drm_device *dev = fb_helper->dev;
		1787	int count = 0;
		1788
6084	serge	1789	if (!drm_fbdev_emulation)
		1790	return 0;
		1791
5060	serge	1792	mutex_lock(&dev->mode_config.mutex);
1963	serge	1793	count = drm_fb_helper_probe_connector_modes(fb_helper,
		1794	dev->mode_config.max_width,
		1795	dev->mode_config.max_height);
5060	serge	1796	mutex_unlock(&dev->mode_config.mutex);
1963	serge	1797	/*
		1798	* we shouldn't end up with no modes here.
		1799	*/
3192	Serge	1800	if (count == 0)
		1801	dev_info(fb_helper->dev->dev, "No connectors reported connected with modes\n");
		1802
		1803	drm_setup_crtcs(fb_helper);
		1804
3243	Serge	1805	return drm_fb_helper_single_fb_probe(fb_helper, bpp_sel);
3192	Serge	1806	}
		1807	EXPORT_SYMBOL(drm_fb_helper_initial_config);
		1808
		1809	/**
		1810	* drm_fb_helper_hotplug_event - respond to a hotplug notification by
		1811	* probing all the outputs attached to the fb
		1812	* @fb_helper: the drm_fb_helper
		1813	*
		1814	* Scan the connectors attached to the fb_helper and try to put together a
		1815	* setup after *notification of a change in output configuration.
		1816	*
3480	Serge	1817	* Called at runtime, takes the mode config locks to be able to check/change the
		1818	* modeset configuration. Must be run from process context (which usually means
		1819	* either the output polling work or a work item launched from the driver's
		1820	* hotplug interrupt).
		1821	*
5060	serge	1822	* Note that drivers may call this even before calling
		1823	* drm_fb_helper_initial_config but only aftert drm_fb_helper_init. This allows
		1824	* for a race-free fbcon setup and will make sure that the fbdev emulation will
		1825	* not miss any hotplug events.
3480	Serge	1826	*
3192	Serge	1827	* RETURNS:
		1828	* 0 on success and a non-zero error code otherwise.
		1829	*/
		1830	int drm_fb_helper_hotplug_event(struct drm_fb_helper *fb_helper)
		1831	{
		1832	struct drm_device *dev = fb_helper->dev;
4560	Serge	1833	u32 max_width, max_height;
3192	Serge	1834
6084	serge	1835	if (!drm_fbdev_emulation)
		1836	return 0;
		1837
3480	Serge	1838	mutex_lock(&fb_helper->dev->mode_config.mutex);
5060	serge	1839	if (!fb_helper->fb \|\| !drm_fb_helper_is_bound(fb_helper)) {
3192	Serge	1840	fb_helper->delayed_hotplug = true;
3480	Serge	1841	mutex_unlock(&fb_helper->dev->mode_config.mutex);
3192	Serge	1842	return 0;
		1843	}
		1844	DRM_DEBUG_KMS("\n");
		1845
6296	serge	1846	max_width = 8192; //fb_helper->fb->width;
		1847	max_height = 8192; //fb_helper->fb->height;
3192	Serge	1848
4560	Serge	1849	drm_fb_helper_probe_connector_modes(fb_helper, max_width, max_height);
3480	Serge	1850	mutex_unlock(&fb_helper->dev->mode_config.mutex);
		1851
6296	serge	1852	// drm_modeset_lock_all(dev);
		1853	// drm_setup_crtcs(fb_helper);
		1854	// drm_modeset_unlock_all(dev);
		1855	// drm_fb_helper_set_par(fb_helper->fbdev);
3480	Serge	1856	return 0;
1963	serge	1857	}
3192	Serge	1858	EXPORT_SYMBOL(drm_fb_helper_hotplug_event);
		1859
4560	Serge	1860	/* The Kconfig DRM_KMS_HELPER selects FRAMEBUFFER_CONSOLE (if !EXPERT)
		1861	* but the module doesn't depend on any fb console symbols. At least
		1862	* attempt to load fbcon to avoid leaving the system without a usable console.
		1863	*/
		1864	#if defined(CONFIG_FRAMEBUFFER_CONSOLE_MODULE) && !defined(CONFIG_EXPERT)
		1865	static int __init drm_fb_helper_modinit(void)
		1866	{
		1867	const char *name = "fbcon";
		1868	struct module *fbcon;
3192	Serge	1869
4560	Serge	1870	mutex_lock(&module_mutex);
		1871	fbcon = find_module(name);
		1872	mutex_unlock(&module_mutex);
3192	Serge	1873
4560	Serge	1874	if (!fbcon)
		1875	request_module_nowait(name);
		1876	return 0;
		1877	}
		1878
		1879	module_init(drm_fb_helper_modinit);
		1880	#endif

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(root)/drivers/video/drm/drm_fb_helper.c – Rev 6660