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;
7144	serge	107	int i, ret;
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) {
7144	serge	114	ret = drm_fb_helper_add_one_connector(fb_helper, connector);
1963	serge	115
7144	serge	116	if (ret)
1963	serge	117	goto fail;
		118	}
6084	serge	119	mutex_unlock(&dev->mode_config.mutex);
1221	serge	120	return 0;
1963	serge	121	fail:
		122	for (i = 0; i < fb_helper->connector_count; i++) {
		123	kfree(fb_helper->connector_info[i]);
		124	fb_helper->connector_info[i] = NULL;
		125	}
		126	fb_helper->connector_count = 0;
6084	serge	127	mutex_unlock(&dev->mode_config.mutex);
		128
7144	serge	129	return ret;
1221	serge	130	}
1963	serge	131	EXPORT_SYMBOL(drm_fb_helper_single_add_all_connectors);
1221	serge	132
5060	serge	133	int drm_fb_helper_add_one_connector(struct drm_fb_helper fb_helper, struct drm_connector connector)
		134	{
		135	struct drm_fb_helper_connector **temp;
		136	struct drm_fb_helper_connector *fb_helper_connector;
		137
6084	serge	138	if (!drm_fbdev_emulation)
		139	return 0;
		140
5060	serge	141	WARN_ON(!mutex_is_locked(&fb_helper->dev->mode_config.mutex));
		142	if (fb_helper->connector_count + 1 > fb_helper->connector_info_alloc_count) {
5271	serge	143	temp = krealloc(fb_helper->connector_info, sizeof(struct drm_fb_helper_connector ) (fb_helper->connector_count + 1), GFP_KERNEL);
5060	serge	144	if (!temp)
		145	return -ENOMEM;
		146
		147	fb_helper->connector_info_alloc_count = fb_helper->connector_count + 1;
		148	fb_helper->connector_info = temp;
		149	}
		150
		151
		152	fb_helper_connector = kzalloc(sizeof(struct drm_fb_helper_connector), GFP_KERNEL);
		153	if (!fb_helper_connector)
		154	return -ENOMEM;
		155
		156	fb_helper_connector->connector = connector;
		157	fb_helper->connector_info[fb_helper->connector_count++] = fb_helper_connector;
		158	return 0;
		159	}
		160	EXPORT_SYMBOL(drm_fb_helper_add_one_connector);
		161
6084	serge	162	static void remove_from_modeset(struct drm_mode_set *set,
		163	struct drm_connector *connector)
		164	{
		165	int i, j;
		166
		167	for (i = 0; i < set->num_connectors; i++) {
		168	if (set->connectors[i] == connector)
		169	break;
		170	}
		171
		172	if (i == set->num_connectors)
		173	return;
		174
		175	for (j = i + 1; j < set->num_connectors; j++) {
		176	set->connectors[j - 1] = set->connectors[j];
		177	}
		178	set->num_connectors--;
		179
		180	/*
		181	* TODO maybe need to makes sure we set it back to !=NULL somewhere?
		182	*/
		183	if (set->num_connectors == 0) {
		184	set->fb = NULL;
		185	drm_mode_destroy(connector->dev, set->mode);
		186	set->mode = NULL;
		187	}
		188	}
		189
5060	serge	190	int drm_fb_helper_remove_one_connector(struct drm_fb_helper *fb_helper,
		191	struct drm_connector *connector)
		192	{
		193	struct drm_fb_helper_connector *fb_helper_connector;
		194	int i, j;
		195
6084	serge	196	if (!drm_fbdev_emulation)
		197	return 0;
		198
5060	serge	199	WARN_ON(!mutex_is_locked(&fb_helper->dev->mode_config.mutex));
		200
		201	for (i = 0; i < fb_helper->connector_count; i++) {
		202	if (fb_helper->connector_info[i]->connector == connector)
		203	break;
		204	}
		205
		206	if (i == fb_helper->connector_count)
		207	return -EINVAL;
		208	fb_helper_connector = fb_helper->connector_info[i];
		209
		210	for (j = i + 1; j < fb_helper->connector_count; j++) {
		211	fb_helper->connector_info[j - 1] = fb_helper->connector_info[j];
		212	}
		213	fb_helper->connector_count--;
		214	kfree(fb_helper_connector);
6084	serge	215
		216	/* also cleanup dangling references to the connector: */
		217	for (i = 0; i < fb_helper->crtc_count; i++)
		218	remove_from_modeset(&fb_helper->crtc_info[i].mode_set, connector);
		219
5060	serge	220	return 0;
		221	}
		222	EXPORT_SYMBOL(drm_fb_helper_remove_one_connector);
5271	serge	223
1963	serge	224	static void drm_fb_helper_save_lut_atomic(struct drm_crtc crtc, struct drm_fb_helper helper)
1179	serge	225	{
1963	serge	226	uint16_t r_base, g_base, *b_base;
		227	int i;
1179	serge	228
4104	Serge	229	if (helper->funcs->gamma_get == NULL)
		230	return;
		231
1963	serge	232	r_base = crtc->gamma_store;
		233	g_base = r_base + crtc->gamma_size;
		234	b_base = g_base + crtc->gamma_size;
1179	serge	235
1963	serge	236	for (i = 0; i < crtc->gamma_size; i++)
		237	helper->funcs->gamma_get(crtc, &r_base[i], &g_base[i], &b_base[i], i);
1179	serge	238	}
		239
1963	serge	240	static void drm_fb_helper_restore_lut_atomic(struct drm_crtc *crtc)
1179	serge	241	{
1963	serge	242	uint16_t r_base, g_base, *b_base;
		243
3031	serge	244	if (crtc->funcs->gamma_set == NULL)
		245	return;
		246
1963	serge	247	r_base = crtc->gamma_store;
		248	g_base = r_base + crtc->gamma_size;
		249	b_base = g_base + crtc->gamma_size;
		250
		251	crtc->funcs->gamma_set(crtc, r_base, g_base, b_base, 0, crtc->gamma_size);
1179	serge	252	}
		253
6084	serge	254	/* Find the real fb for a given fb helper CRTC */
		255	static struct drm_framebuffer drm_mode_config_fb(struct drm_crtc crtc)
		256	{
		257	struct drm_device *dev = crtc->dev;
		258	struct drm_crtc *c;
1179	serge	259
6084	serge	260	drm_for_each_crtc(c, dev) {
		261	if (crtc->base.id == c->base.id)
		262	return c->primary->fb;
		263	}
		264
		265	return NULL;
		266	}
		267	static int restore_fbdev_mode_atomic(struct drm_fb_helper *fb_helper)
5060	serge	268	{
		269	struct drm_device *dev = fb_helper->dev;
		270	struct drm_plane *plane;
6084	serge	271	struct drm_atomic_state *state;
		272	int i, ret;
		273	unsigned plane_mask;
		274
		275	state = drm_atomic_state_alloc(dev);
		276	if (!state)
		277	return -ENOMEM;
		278
		279	state->acquire_ctx = dev->mode_config.acquire_ctx;
		280	retry:
		281	plane_mask = 0;
		282	drm_for_each_plane(plane, dev) {
		283	struct drm_plane_state *plane_state;
		284
		285	plane_state = drm_atomic_get_plane_state(state, plane);
		286	if (IS_ERR(plane_state)) {
		287	ret = PTR_ERR(plane_state);
		288	goto fail;
		289	}
		290
		291	plane_state->rotation = BIT(DRM_ROTATE_0);
		292
		293	plane->old_fb = plane->fb;
		294	plane_mask \|= 1 << drm_plane_index(plane);
		295
		296	/* disable non-primary: */
		297	if (plane->type == DRM_PLANE_TYPE_PRIMARY)
		298	continue;
		299
		300	ret = __drm_atomic_helper_disable_plane(plane, plane_state);
		301	if (ret != 0)
		302	goto fail;
		303	}
		304
		305	for(i = 0; i < fb_helper->crtc_count; i++) {
		306	struct drm_mode_set *mode_set = &fb_helper->crtc_info[i].mode_set;
		307
		308	ret = __drm_atomic_helper_set_config(mode_set, state);
		309	if (ret != 0)
		310	goto fail;
		311	}
		312
		313	ret = drm_atomic_commit(state);
		314
		315	fail:
		316	drm_atomic_clean_old_fb(dev, plane_mask, ret);
		317
		318	if (ret == -EDEADLK)
		319	goto backoff;
		320
		321	if (ret != 0)
		322	drm_atomic_state_free(state);
		323
		324	return ret;
		325
		326	backoff:
		327	drm_atomic_state_clear(state);
		328	drm_atomic_legacy_backoff(state);
		329
		330	goto retry;
		331	}
		332
		333	static int restore_fbdev_mode(struct drm_fb_helper *fb_helper)
		334	{
		335	struct drm_device *dev = fb_helper->dev;
		336	struct drm_plane *plane;
5060	serge	337	int i;
		338
		339	drm_warn_on_modeset_not_all_locked(dev);
		340
6084	serge	341	if (fb_helper->atomic)
		342	return restore_fbdev_mode_atomic(fb_helper);
		343
		344	drm_for_each_plane(plane, dev) {
5060	serge	345	if (plane->type != DRM_PLANE_TYPE_PRIMARY)
		346	drm_plane_force_disable(plane);
		347
5271	serge	348	if (dev->mode_config.rotation_property) {
		349	drm_mode_plane_set_obj_prop(plane,
		350	dev->mode_config.rotation_property,
		351	BIT(DRM_ROTATE_0));
		352	}
		353	}
		354
5060	serge	355	for (i = 0; i < fb_helper->crtc_count; i++) {
		356	struct drm_mode_set *mode_set = &fb_helper->crtc_info[i].mode_set;
		357	struct drm_crtc *crtc = mode_set->crtc;
		358	int ret;
		359
6084	serge	360	if (crtc->funcs->cursor_set2) {
		361	ret = crtc->funcs->cursor_set2(crtc, NULL, 0, 0, 0, 0, 0);
		362	if (ret)
		363	return ret;
		364	} else if (crtc->funcs->cursor_set) {
5060	serge	365	ret = crtc->funcs->cursor_set(crtc, NULL, 0, 0, 0);
		366	if (ret)
6084	serge	367	return ret;
5060	serge	368	}
		369
		370	ret = drm_mode_set_config_internal(mode_set);
		371	if (ret)
6084	serge	372	return ret;
5060	serge	373	}
6084	serge	374
		375	return 0;
5060	serge	376	}
6084	serge	377
5060	serge	378	/**
		379	* drm_fb_helper_restore_fbdev_mode_unlocked - restore fbdev configuration
		380	* @fb_helper: fbcon to restore
		381	*
		382	* This should be called from driver's drm ->lastclose callback
		383	* when implementing an fbcon on top of kms using this helper. This ensures that
		384	* the user isn't greeted with a black screen when e.g. X dies.
6084	serge	385	*
		386	* RETURNS:
		387	* Zero if everything went ok, negative error code otherwise.
5060	serge	388	*/
6084	serge	389	int drm_fb_helper_restore_fbdev_mode_unlocked(struct drm_fb_helper *fb_helper)
5060	serge	390	{
		391	struct drm_device *dev = fb_helper->dev;
6084	serge	392	bool do_delayed;
		393	int ret;
5271	serge	394
6084	serge	395	if (!drm_fbdev_emulation)
		396	return -ENODEV;
		397
5060	serge	398	drm_modeset_lock_all(dev);
		399	ret = restore_fbdev_mode(fb_helper);
6084	serge	400
		401	do_delayed = fb_helper->delayed_hotplug;
		402	if (do_delayed)
		403	fb_helper->delayed_hotplug = false;
5060	serge	404	drm_modeset_unlock_all(dev);
6084	serge	405
		406	if (do_delayed)
		407	drm_fb_helper_hotplug_event(fb_helper);
5060	serge	408	return ret;
		409	}
		410	EXPORT_SYMBOL(drm_fb_helper_restore_fbdev_mode_unlocked);
		411
3480	Serge	412	static bool drm_fb_helper_is_bound(struct drm_fb_helper *fb_helper)
		413	{
		414	struct drm_device *dev = fb_helper->dev;
		415	struct drm_crtc *crtc;
		416	int bound = 0, crtcs_bound = 0;
1179	serge	417
6084	serge	418	/* Sometimes user space wants everything disabled, so don't steal the
		419	* display if there's a master. */
6296	serge	420	// if (dev->primary->master)
		421	// return false;
6084	serge	422
		423	drm_for_each_crtc(crtc, dev) {
5060	serge	424	if (crtc->primary->fb)
3480	Serge	425	crtcs_bound++;
5060	serge	426	if (crtc->primary->fb == fb_helper->fb)
3480	Serge	427	bound++;
		428	}
		429
		430	if (bound < crtcs_bound)
		431	return false;
4560	Serge	432
3480	Serge	433	return true;
		434	}
		435
4560	Serge	436	#ifdef CONFIG_MAGIC_SYSRQ
		437	static void drm_fb_helper_restore_work_fn(struct work_struct *ignored)
		438	{
		439	bool ret;
		440	ret = drm_fb_helper_force_kernel_mode();
		441	if (ret == true)
		442	DRM_ERROR("Failed to restore crtc configuration\n");
		443	}
		444	static DECLARE_WORK(drm_fb_helper_restore_work, drm_fb_helper_restore_work_fn);
		445
		446	static void drm_fb_helper_sysrq(int dummy1)
		447	{
		448	schedule_work(&drm_fb_helper_restore_work);
		449	}
		450
		451	static struct sysrq_key_op sysrq_drm_fb_helper_restore_op = {
		452	.handler = drm_fb_helper_sysrq,
		453	.help_msg = "force-fb(V)",
		454	.action_msg = "Restore framebuffer console",
		455	};
		456	#else
		457
		458	#endif
		459
3031	serge	460	static void drm_fb_helper_dpms(struct fb_info *info, int dpms_mode)
1179	serge	461	{
		462	struct drm_fb_helper *fb_helper = info->par;
		463	struct drm_device *dev = fb_helper->dev;
		464	struct drm_crtc *crtc;
1963	serge	465	struct drm_connector *connector;
		466	int i, j;
1179	serge	467
		468	/*
3031	serge	469	* For each CRTC in this fb, turn the connectors on/off.
1179	serge	470	*/
3480	Serge	471	drm_modeset_lock_all(dev);
		472	if (!drm_fb_helper_is_bound(fb_helper)) {
		473	drm_modeset_unlock_all(dev);
		474	return;
		475	}
		476
1179	serge	477	for (i = 0; i < fb_helper->crtc_count; i++) {
1963	serge	478	crtc = fb_helper->crtc_info[i].mode_set.crtc;
1179	serge	479
1963	serge	480	if (!crtc->enabled)
6084	serge	481	continue;
1179	serge	482
3031	serge	483	/* Walk the connectors & encoders on this fb turning them on/off */
1963	serge	484	for (j = 0; j < fb_helper->connector_count; j++) {
		485	connector = fb_helper->connector_info[j]->connector;
3031	serge	486	connector->funcs->dpms(connector, dpms_mode);
3192	Serge	487	drm_object_property_set_value(&connector->base,
3031	serge	488	dev->mode_config.dpms_property, dpms_mode);
1963	serge	489	}
		490	}
3480	Serge	491	drm_modeset_unlock_all(dev);
1179	serge	492	}
		493
3480	Serge	494	/**
		495	* drm_fb_helper_blank - implementation for ->fb_blank
		496	* @blank: desired blanking state
		497	* @info: fbdev registered by the helper
		498	*/
1179	serge	499	int drm_fb_helper_blank(int blank, struct fb_info *info)
		500	{
6084	serge	501	if (oops_in_progress)
		502	return -EBUSY;
		503
1179	serge	504	switch (blank) {
1321	serge	505	/* Display: On; HSync: On, VSync: On */
1179	serge	506	case FB_BLANK_UNBLANK:
3031	serge	507	drm_fb_helper_dpms(info, DRM_MODE_DPMS_ON);
1179	serge	508	break;
1321	serge	509	/* Display: Off; HSync: On, VSync: On */
1179	serge	510	case FB_BLANK_NORMAL:
3031	serge	511	drm_fb_helper_dpms(info, DRM_MODE_DPMS_STANDBY);
1179	serge	512	break;
1321	serge	513	/* Display: Off; HSync: Off, VSync: On */
1179	serge	514	case FB_BLANK_HSYNC_SUSPEND:
3031	serge	515	drm_fb_helper_dpms(info, DRM_MODE_DPMS_STANDBY);
1179	serge	516	break;
1321	serge	517	/* Display: Off; HSync: On, VSync: Off */
1179	serge	518	case FB_BLANK_VSYNC_SUSPEND:
3031	serge	519	drm_fb_helper_dpms(info, DRM_MODE_DPMS_SUSPEND);
1179	serge	520	break;
1321	serge	521	/* Display: Off; HSync: Off, VSync: Off */
1179	serge	522	case FB_BLANK_POWERDOWN:
3031	serge	523	drm_fb_helper_dpms(info, DRM_MODE_DPMS_OFF);
1179	serge	524	break;
		525	}
		526	return 0;
		527	}
		528	EXPORT_SYMBOL(drm_fb_helper_blank);
		529
		530	static void drm_fb_helper_crtc_free(struct drm_fb_helper *helper)
		531	{
		532	int i;
		533
1963	serge	534	for (i = 0; i < helper->connector_count; i++)
		535	kfree(helper->connector_info[i]);
		536	kfree(helper->connector_info);
3031	serge	537	for (i = 0; i < helper->crtc_count; i++) {
1179	serge	538	kfree(helper->crtc_info[i].mode_set.connectors);
3031	serge	539	if (helper->crtc_info[i].mode_set.mode)
		540	drm_mode_destroy(helper->dev, helper->crtc_info[i].mode_set.mode);
		541	}
1179	serge	542	kfree(helper->crtc_info);
		543	}
		544
3480	Serge	545	/**
5060	serge	546	* drm_fb_helper_prepare - setup a drm_fb_helper structure
		547	* @dev: DRM device
		548	* @helper: driver-allocated fbdev helper structure to set up
		549	* @funcs: pointer to structure of functions associate with this helper
		550	*
		551	* Sets up the bare minimum to make the framebuffer helper usable. This is
		552	* useful to implement race-free initialization of the polling helpers.
		553	*/
		554	void drm_fb_helper_prepare(struct drm_device dev, struct drm_fb_helper helper,
		555	const struct drm_fb_helper_funcs *funcs)
		556	{
		557	INIT_LIST_HEAD(&helper->kernel_fb_list);
		558	helper->funcs = funcs;
		559	helper->dev = dev;
		560	}
		561	EXPORT_SYMBOL(drm_fb_helper_prepare);
		562
		563	/**
3480	Serge	564	* drm_fb_helper_init - initialize a drm_fb_helper structure
		565	* @dev: drm device
		566	* @fb_helper: driver-allocated fbdev helper structure to initialize
		567	* @crtc_count: maximum number of crtcs to support in this fbdev emulation
		568	* @max_conn_count: max connector count
		569	*
		570	* This allocates the structures for the fbdev helper with the given limits.
		571	* Note that this won't yet touch the hardware (through the driver interfaces)
		572	* nor register the fbdev. This is only done in drm_fb_helper_initial_config()
		573	* to allow driver writes more control over the exact init sequence.
		574	*
5060	serge	575	* Drivers must call drm_fb_helper_prepare() before calling this function.
3480	Serge	576	*
		577	* RETURNS:
		578	* Zero if everything went ok, nonzero otherwise.
		579	*/
1963	serge	580	int drm_fb_helper_init(struct drm_device *dev,
		581	struct drm_fb_helper *fb_helper,
		582	int crtc_count, int max_conn_count)
1179	serge	583	{
		584	struct drm_crtc *crtc;
		585	int i;
		586
6084	serge	587	if (!drm_fbdev_emulation)
		588	return 0;
		589
5060	serge	590	if (!max_conn_count)
		591	return -EINVAL;
1963	serge	592
		593	fb_helper->crtc_info = kcalloc(crtc_count, sizeof(struct drm_fb_helper_crtc), GFP_KERNEL);
		594	if (!fb_helper->crtc_info)
1179	serge	595	return -ENOMEM;
		596
1963	serge	597	fb_helper->crtc_count = crtc_count;
		598	fb_helper->connector_info = kcalloc(dev->mode_config.num_connector, sizeof(struct drm_fb_helper_connector *), GFP_KERNEL);
		599	if (!fb_helper->connector_info) {
		600	kfree(fb_helper->crtc_info);
		601	return -ENOMEM;
		602	}
5060	serge	603	fb_helper->connector_info_alloc_count = dev->mode_config.num_connector;
1963	serge	604	fb_helper->connector_count = 0;
1179	serge	605
		606	for (i = 0; i < crtc_count; i++) {
1963	serge	607	fb_helper->crtc_info[i].mode_set.connectors =
1179	serge	608	kcalloc(max_conn_count,
		609	sizeof(struct drm_connector *),
		610	GFP_KERNEL);
		611
3031	serge	612	if (!fb_helper->crtc_info[i].mode_set.connectors)
1179	serge	613	goto out_free;
1963	serge	614	fb_helper->crtc_info[i].mode_set.num_connectors = 0;
1179	serge	615	}
		616
		617	i = 0;
6084	serge	618	drm_for_each_crtc(crtc, dev) {
1963	serge	619	fb_helper->crtc_info[i].mode_set.crtc = crtc;
1179	serge	620	i++;
		621	}
3031	serge	622
6084	serge	623	fb_helper->atomic = !!drm_core_check_feature(dev, DRIVER_ATOMIC);
		624
1179	serge	625	return 0;
		626	out_free:
1963	serge	627	drm_fb_helper_crtc_free(fb_helper);
1179	serge	628	return -ENOMEM;
		629	}
1963	serge	630	EXPORT_SYMBOL(drm_fb_helper_init);
1179	serge	631
6084	serge	632	/**
		633	* drm_fb_helper_alloc_fbi - allocate fb_info and some of its members
		634	* @fb_helper: driver-allocated fbdev helper
		635	*
		636	* A helper to alloc fb_info and the members cmap and apertures. Called
		637	* by the driver within the fb_probe fb_helper callback function.
		638	*
		639	* RETURNS:
		640	* fb_info pointer if things went okay, pointer containing error code
		641	* otherwise
		642	*/
		643	struct fb_info drm_fb_helper_alloc_fbi(struct drm_fb_helper fb_helper)
		644	{
		645	struct device *dev = fb_helper->dev->dev;
		646	struct fb_info *info;
		647	int ret;
		648
		649	info = framebuffer_alloc(0, dev);
		650	if (!info)
		651	return ERR_PTR(-ENOMEM);
		652
		653
		654	fb_helper->fbdev = info;
		655
		656	return info;
		657
		658	}
		659	EXPORT_SYMBOL(drm_fb_helper_alloc_fbi);
1246	serge	660	static int setcolreg(struct drm_crtc *crtc, u16 red, u16 green,
1221	serge	661	u16 blue, u16 regno, struct fb_info *info)
		662	{
		663	struct drm_fb_helper *fb_helper = info->par;
		664	struct drm_framebuffer *fb = fb_helper->fb;
		665	int pindex;
		666
1246	serge	667	if (info->fix.visual == FB_VISUAL_TRUECOLOR) {
		668	u32 *palette;
		669	u32 value;
		670	/* place color in psuedopalette */
		671	if (regno > 16)
		672	return -EINVAL;
		673	palette = (u32 *)info->pseudo_palette;
		674	red >>= (16 - info->var.red.length);
		675	green >>= (16 - info->var.green.length);
		676	blue >>= (16 - info->var.blue.length);
		677	value = (red << info->var.red.offset) \|
		678	(green << info->var.green.offset) \|
		679	(blue << info->var.blue.offset);
1963	serge	680	if (info->var.transp.length > 0) {
		681	u32 mask = (1 << info->var.transp.length) - 1;
		682	mask <<= info->var.transp.offset;
		683	value \|= mask;
		684	}
1246	serge	685	palette[regno] = value;
		686	return 0;
		687	}
		688
4104	Serge	689	/*
		690	* The driver really shouldn't advertise pseudo/directcolor
		691	* visuals if it can't deal with the palette.
		692	*/
		693	if (WARN_ON(!fb_helper->funcs->gamma_set \|\|
		694	!fb_helper->funcs->gamma_get))
		695	return -EINVAL;
		696
1221	serge	697	pindex = regno;
		698
		699	if (fb->bits_per_pixel == 16) {
		700	pindex = regno << 3;
		701
		702	if (fb->depth == 16 && regno > 63)
1246	serge	703	return -EINVAL;
1221	serge	704	if (fb->depth == 15 && regno > 31)
1246	serge	705	return -EINVAL;
1221	serge	706
		707	if (fb->depth == 16) {
		708	u16 r, g, b;
		709	int i;
		710	if (regno < 32) {
		711	for (i = 0; i < 8; i++)
		712	fb_helper->funcs->gamma_set(crtc, red,
		713	green, blue, pindex + i);
		714	}
		715
		716	fb_helper->funcs->gamma_get(crtc, &r,
		717	&g, &b,
		718	pindex >> 1);
		719
		720	for (i = 0; i < 4; i++)
		721	fb_helper->funcs->gamma_set(crtc, r,
		722	green, b,
		723	(pindex >> 1) + i);
		724	}
		725	}
		726
		727	if (fb->depth != 16)
		728	fb_helper->funcs->gamma_set(crtc, red, green, blue, pindex);
1246	serge	729	return 0;
1221	serge	730	}
		731
3480	Serge	732	/**
		733	* drm_fb_helper_setcmap - implementation for ->fb_setcmap
		734	* @cmap: cmap to set
		735	* @info: fbdev registered by the helper
		736	*/
1221	serge	737	int drm_fb_helper_setcmap(struct fb_cmap cmap, struct fb_info info)
		738	{
		739	struct drm_fb_helper *fb_helper = info->par;
4104	Serge	740	struct drm_device *dev = fb_helper->dev;
6084	serge	741	const struct drm_crtc_helper_funcs *crtc_funcs;
1221	serge	742	u16 red, green, blue, transp;
		743	struct drm_crtc *crtc;
1963	serge	744	int i, j, rc = 0;
1221	serge	745	int start;
		746
6084	serge	747	if (oops_in_progress)
		748	return -EBUSY;
		749
4104	Serge	750	drm_modeset_lock_all(dev);
		751	if (!drm_fb_helper_is_bound(fb_helper)) {
		752	drm_modeset_unlock_all(dev);
		753	return -EBUSY;
		754	}
		755
6084	serge	756	for (i = 0; i < fb_helper->crtc_count; i++) {
1963	serge	757	crtc = fb_helper->crtc_info[i].mode_set.crtc;
		758	crtc_funcs = crtc->helper_private;
1221	serge	759
		760	red = cmap->red;
		761	green = cmap->green;
		762	blue = cmap->blue;
		763	transp = cmap->transp;
		764	start = cmap->start;
		765
1963	serge	766	for (j = 0; j < cmap->len; j++) {
1221	serge	767	u16 hred, hgreen, hblue, htransp = 0xffff;
		768
		769	hred = *red++;
		770	hgreen = *green++;
		771	hblue = *blue++;
		772
		773	if (transp)
		774	htransp = *transp++;
		775
1246	serge	776	rc = setcolreg(crtc, hred, hgreen, hblue, start++, info);
		777	if (rc)
4104	Serge	778	goto out;
1221	serge	779	}
4104	Serge	780	if (crtc_funcs->load_lut)
6084	serge	781	crtc_funcs->load_lut(crtc);
1221	serge	782	}
4104	Serge	783	out:
		784	drm_modeset_unlock_all(dev);
1221	serge	785	return rc;
		786	}
		787	EXPORT_SYMBOL(drm_fb_helper_setcmap);
		788
3480	Serge	789	/**
		790	* drm_fb_helper_check_var - implementation for ->fb_check_var
		791	* @var: screeninfo to check
		792	* @info: fbdev registered by the helper
		793	*/
1179	serge	794	int drm_fb_helper_check_var(struct fb_var_screeninfo *var,
		795	struct fb_info *info)
		796	{
		797	struct drm_fb_helper *fb_helper = info->par;
		798	struct drm_framebuffer *fb = fb_helper->fb;
		799	int depth;
		800
1963	serge	801	if (var->pixclock != 0 \|\| in_dbg_master())
1179	serge	802	return -EINVAL;
		803
		804	/* Need to resize the fb object !!! */
3031	serge	805	if (var->bits_per_pixel > fb->bits_per_pixel \|\|
		806	var->xres > fb->width \|\| var->yres > fb->height \|\|
		807	var->xres_virtual > fb->width \|\| var->yres_virtual > fb->height) {
1404	serge	808	DRM_DEBUG("fb userspace requested width/height/bpp is greater than current fb "
3031	serge	809	"request %dx%d-%d (virtual %dx%d) > %dx%d-%d\n",
		810	var->xres, var->yres, var->bits_per_pixel,
		811	var->xres_virtual, var->yres_virtual,
1404	serge	812	fb->width, fb->height, fb->bits_per_pixel);
1179	serge	813	return -EINVAL;
		814	}
		815
		816	switch (var->bits_per_pixel) {
		817	case 16:
		818	depth = (var->green.length == 6) ? 16 : 15;
		819	break;
		820	case 32:
		821	depth = (var->transp.length > 0) ? 32 : 24;
		822	break;
		823	default:
		824	depth = var->bits_per_pixel;
		825	break;
		826	}
		827
		828	switch (depth) {
		829	case 8:
		830	var->red.offset = 0;
		831	var->green.offset = 0;
		832	var->blue.offset = 0;
		833	var->red.length = 8;
		834	var->green.length = 8;
		835	var->blue.length = 8;
		836	var->transp.length = 0;
		837	var->transp.offset = 0;
		838	break;
		839	case 15:
		840	var->red.offset = 10;
		841	var->green.offset = 5;
		842	var->blue.offset = 0;
		843	var->red.length = 5;
		844	var->green.length = 5;
		845	var->blue.length = 5;
		846	var->transp.length = 1;
		847	var->transp.offset = 15;
		848	break;
		849	case 16:
		850	var->red.offset = 11;
		851	var->green.offset = 5;
		852	var->blue.offset = 0;
		853	var->red.length = 5;
		854	var->green.length = 6;
		855	var->blue.length = 5;
		856	var->transp.length = 0;
		857	var->transp.offset = 0;
		858	break;
		859	case 24:
		860	var->red.offset = 16;
		861	var->green.offset = 8;
		862	var->blue.offset = 0;
		863	var->red.length = 8;
		864	var->green.length = 8;
		865	var->blue.length = 8;
		866	var->transp.length = 0;
		867	var->transp.offset = 0;
		868	break;
		869	case 32:
		870	var->red.offset = 16;
		871	var->green.offset = 8;
		872	var->blue.offset = 0;
		873	var->red.length = 8;
		874	var->green.length = 8;
		875	var->blue.length = 8;
		876	var->transp.length = 8;
		877	var->transp.offset = 24;
		878	break;
		879	default:
		880	return -EINVAL;
		881	}
		882	return 0;
		883	}
		884	EXPORT_SYMBOL(drm_fb_helper_check_var);
		885
3480	Serge	886	/**
		887	* drm_fb_helper_set_par - implementation for ->fb_set_par
		888	* @info: fbdev registered by the helper
		889	*
		890	* This will let fbcon do the mode init and is called at initialization time by
		891	* the fbdev core when registering the driver, and later on through the hotplug
		892	* callback.
		893	*/
1179	serge	894	int drm_fb_helper_set_par(struct fb_info *info)
		895	{
		896	struct drm_fb_helper *fb_helper = info->par;
		897	struct fb_var_screeninfo *var = &info->var;
		898
6084	serge	899	if (oops_in_progress)
		900	return -EBUSY;
		901
1313	serge	902	if (var->pixclock != 0) {
1430	serge	903	DRM_ERROR("PIXEL CLOCK SET\n");
1179	serge	904	return -EINVAL;
		905	}
		906
5060	serge	907	drm_fb_helper_restore_fbdev_mode_unlocked(fb_helper);
1963	serge	908
1179	serge	909	return 0;
		910	}
		911	EXPORT_SYMBOL(drm_fb_helper_set_par);
		912
6084	serge	913	static int pan_display_atomic(struct fb_var_screeninfo *var,
		914	struct fb_info *info)
		915	{
		916	struct drm_fb_helper *fb_helper = info->par;
		917	struct drm_device *dev = fb_helper->dev;
		918	struct drm_atomic_state *state;
		919	struct drm_plane *plane;
		920	int i, ret;
		921	unsigned plane_mask;
		922
		923	state = drm_atomic_state_alloc(dev);
		924	if (!state)
		925	return -ENOMEM;
		926
		927	state->acquire_ctx = dev->mode_config.acquire_ctx;
		928	retry:
		929	plane_mask = 0;
		930	for(i = 0; i < fb_helper->crtc_count; i++) {
		931	struct drm_mode_set *mode_set;
		932
		933	mode_set = &fb_helper->crtc_info[i].mode_set;
		934
		935	mode_set->x = var->xoffset;
		936	mode_set->y = var->yoffset;
		937
		938	ret = __drm_atomic_helper_set_config(mode_set, state);
		939	if (ret != 0)
		940	goto fail;
		941
		942	plane = mode_set->crtc->primary;
6937	serge	943	plane_mask \|= (1 << drm_plane_index(plane));
6084	serge	944	plane->old_fb = plane->fb;
		945	}
		946
		947	ret = drm_atomic_commit(state);
		948	if (ret != 0)
		949	goto fail;
		950
		951	info->var.xoffset = var->xoffset;
		952	info->var.yoffset = var->yoffset;
		953
		954
		955	fail:
		956	drm_atomic_clean_old_fb(dev, plane_mask, ret);
		957
		958	if (ret == -EDEADLK)
		959	goto backoff;
		960
		961	if (ret != 0)
		962	drm_atomic_state_free(state);
		963
		964	return ret;
		965
		966	backoff:
		967	drm_atomic_state_clear(state);
		968	drm_atomic_legacy_backoff(state);
		969
		970	goto retry;
		971	}
		972
3480	Serge	973	/**
		974	* drm_fb_helper_pan_display - implementation for ->fb_pan_display
		975	* @var: updated screen information
		976	* @info: fbdev registered by the helper
		977	*/
1179	serge	978	int drm_fb_helper_pan_display(struct fb_var_screeninfo *var,
		979	struct fb_info *info)
		980	{
		981	struct drm_fb_helper *fb_helper = info->par;
		982	struct drm_device *dev = fb_helper->dev;
		983	struct drm_mode_set *modeset;
		984	int ret = 0;
		985	int i;
		986
6084	serge	987	if (oops_in_progress)
		988	return -EBUSY;
		989
3480	Serge	990	drm_modeset_lock_all(dev);
		991	if (!drm_fb_helper_is_bound(fb_helper)) {
		992	drm_modeset_unlock_all(dev);
		993	return -EBUSY;
		994	}
		995
6084	serge	996	if (fb_helper->atomic) {
		997	ret = pan_display_atomic(var, info);
		998	goto unlock;
		999	}
		1000
		1001	for (i = 0; i < fb_helper->crtc_count; i++) {
1179	serge	1002	modeset = &fb_helper->crtc_info[i].mode_set;
		1003
		1004	modeset->x = var->xoffset;
		1005	modeset->y = var->yoffset;
		1006
		1007	if (modeset->num_connectors) {
3480	Serge	1008	ret = drm_mode_set_config_internal(modeset);
1179	serge	1009	if (!ret) {
		1010	info->var.xoffset = var->xoffset;
		1011	info->var.yoffset = var->yoffset;
		1012	}
		1013	}
		1014	}
6084	serge	1015	unlock:
3480	Serge	1016	drm_modeset_unlock_all(dev);
1179	serge	1017	return ret;
		1018	}
		1019	EXPORT_SYMBOL(drm_fb_helper_pan_display);
		1020
3480	Serge	1021	/*
		1022	* Allocates the backing storage and sets up the fbdev info structure through
		1023	* the ->fb_probe callback and then registers the fbdev and sets up the panic
		1024	* notifier.
		1025	*/
		1026	static int drm_fb_helper_single_fb_probe(struct drm_fb_helper *fb_helper,
6084	serge	1027	int preferred_bpp)
1179	serge	1028	{
3480	Serge	1029	int ret = 0;
1179	serge	1030	int crtc_count = 0;
1963	serge	1031	int i;
1179	serge	1032	struct fb_info *info;
1963	serge	1033	struct drm_fb_helper_surface_size sizes;
		1034	int gamma_size = 0;
1179	serge	1035
1963	serge	1036	memset(&sizes, 0, sizeof(struct drm_fb_helper_surface_size));
		1037	sizes.surface_depth = 24;
		1038	sizes.surface_bpp = 32;
		1039	sizes.fb_width = (unsigned)-1;
		1040	sizes.fb_height = (unsigned)-1;
1221	serge	1041
3031	serge	1042	/* if driver picks 8 or 16 by default use that
		1043	for both depth/bpp */
3192	Serge	1044	if (preferred_bpp != sizes.surface_bpp)
3031	serge	1045	sizes.surface_depth = sizes.surface_bpp = preferred_bpp;
3192	Serge	1046
3031	serge	1047	/* first up get a count of crtcs now in use and new min/maxes width/heights */
		1048	for (i = 0; i < fb_helper->connector_count; i++) {
		1049	struct drm_fb_helper_connector *fb_helper_conn = fb_helper->connector_info[i];
		1050	struct drm_cmdline_mode *cmdline_mode;
		1051
5271	serge	1052	cmdline_mode = &fb_helper_conn->connector->cmdline_mode;
3031	serge	1053
		1054	if (cmdline_mode->bpp_specified) {
		1055	switch (cmdline_mode->bpp) {
		1056	case 8:
		1057	sizes.surface_depth = sizes.surface_bpp = 8;
		1058	break;
		1059	case 15:
		1060	sizes.surface_depth = 15;
		1061	sizes.surface_bpp = 16;
		1062	break;
		1063	case 16:
		1064	sizes.surface_depth = sizes.surface_bpp = 16;
		1065	break;
		1066	case 24:
		1067	sizes.surface_depth = sizes.surface_bpp = 24;
		1068	break;
		1069	case 32:
6084	serge	1070	sizes.surface_depth = 24;
		1071	sizes.surface_bpp = 32;
3031	serge	1072	break;
		1073	}
		1074	break;
		1075	}
		1076	}
1221	serge	1077
1963	serge	1078	crtc_count = 0;
		1079	for (i = 0; i < fb_helper->crtc_count; i++) {
		1080	struct drm_display_mode *desired_mode;
6084	serge	1081	struct drm_mode_set *mode_set;
		1082	int x, y, j;
		1083	/* in case of tile group, are we the last tile vert or horiz?
		1084	* If no tile group you are always the last one both vertically
		1085	* and horizontally
		1086	*/
		1087	bool lastv = true, lasth = true;
		1088
1963	serge	1089	desired_mode = fb_helper->crtc_info[i].desired_mode;
6084	serge	1090	mode_set = &fb_helper->crtc_info[i].mode_set;
		1091
		1092	if (!desired_mode)
		1093	continue;
		1094
		1095	crtc_count++;
		1096
5271	serge	1097	x = fb_helper->crtc_info[i].x;
		1098	y = fb_helper->crtc_info[i].y;
6084	serge	1099
		1100	if (gamma_size == 0)
		1101	gamma_size = fb_helper->crtc_info[i].mode_set.crtc->gamma_size;
		1102
		1103	sizes.surface_width = max_t(u32, desired_mode->hdisplay + x, sizes.surface_width);
		1104	sizes.surface_height = max_t(u32, desired_mode->vdisplay + y, sizes.surface_height);
		1105
		1106	for (j = 0; j < mode_set->num_connectors; j++) {
		1107	struct drm_connector *connector = mode_set->connectors[j];
		1108	if (connector->has_tile) {
		1109	lasth = (connector->tile_h_loc == (connector->num_h_tile - 1));
		1110	lastv = (connector->tile_v_loc == (connector->num_v_tile - 1));
		1111	/* cloning to multiple tiles is just crazy-talk, so: */
		1112	break;
		1113	}
		1114	}
		1115
		1116	if (lasth)
		1117	sizes.fb_width = min_t(u32, desired_mode->hdisplay + x, sizes.fb_width);
		1118	if (lastv)
		1119	sizes.fb_height = min_t(u32, desired_mode->vdisplay + y, sizes.fb_height);
1179	serge	1120	}
		1121
1963	serge	1122	if (crtc_count == 0 \|\| sizes.fb_width == -1 \|\| sizes.fb_height == -1) {
1179	serge	1123	/* hmm everyone went away - assume VGA cable just fell out
		1124	and will come back later. */
1963	serge	1125	DRM_INFO("Cannot find any crtc or sizes - going 1024x768\n");
		1126	sizes.fb_width = sizes.surface_width = 1024;
		1127	sizes.fb_height = sizes.surface_height = 768;
1179	serge	1128	}
		1129
1963	serge	1130	/* push down into drivers */
3480	Serge	1131	ret = (*fb_helper->funcs->fb_probe)(fb_helper, &sizes);
		1132	if (ret < 0)
		1133	return ret;
1179	serge	1134
1963	serge	1135	info = fb_helper->fbdev;
1179	serge	1136
3480	Serge	1137	/*
		1138	* Set the fb pointer - usually drm_setup_crtcs does this for hotplug
		1139	* events, but at init time drm_setup_crtcs needs to be called before
		1140	* the fb is allocated (since we need to figure out the desired size of
		1141	* the fb before we can allocate it ...). Hence we need to fix things up
		1142	* here again.
		1143	*/
3192	Serge	1144	for (i = 0; i < fb_helper->crtc_count; i++)
3480	Serge	1145	if (fb_helper->crtc_info[i].mode_set.num_connectors)
6084	serge	1146	fb_helper->crtc_info[i].mode_set.fb = fb_helper->fb;
1179	serge	1147
3480	Serge	1148
6084	serge	1149	info->var.pixclock = 0;
		1150
5271	serge	1151	dev_info(fb_helper->dev->dev, "fb%d: %s frame buffer device\n",
		1152	info->node, info->fix.id);
1963	serge	1153
		1154
6084	serge	1155	list_add(&fb_helper->kernel_fb_list, &kernel_fb_helper_list);
		1156
1179	serge	1157	return 0;
		1158	}
		1159
3480	Serge	1160	/**
		1161	* drm_fb_helper_fill_fix - initializes fixed fbdev information
		1162	* @info: fbdev registered by the helper
		1163	* @pitch: desired pitch
		1164	* @depth: desired depth
		1165	*
		1166	* Helper to fill in the fixed fbdev information useful for a non-accelerated
		1167	* fbdev emulations. Drivers which support acceleration methods which impose
		1168	* additional constraints need to set up their own limits.
		1169	*
		1170	* Drivers should call this (or their equivalent setup code) from their
		1171	* ->fb_probe callback.
		1172	*/
1221	serge	1173	void drm_fb_helper_fill_fix(struct fb_info *info, uint32_t pitch,
		1174	uint32_t depth)
1179	serge	1175	{
		1176	info->fix.type = FB_TYPE_PACKED_PIXELS;
1221	serge	1177	info->fix.visual = depth == 8 ? FB_VISUAL_PSEUDOCOLOR :
1246	serge	1178	FB_VISUAL_TRUECOLOR;
1963	serge	1179	info->fix.mmio_start = 0;
		1180	info->fix.mmio_len = 0;
1179	serge	1181	info->fix.type_aux = 0;
		1182	info->fix.xpanstep = 1; /* doing it in hw */
		1183	info->fix.ypanstep = 1; /* doing it in hw */
		1184	info->fix.ywrapstep = 0;
		1185	info->fix.accel = FB_ACCEL_NONE;
		1186
		1187	info->fix.line_length = pitch;
		1188	return;
		1189	}
		1190	EXPORT_SYMBOL(drm_fb_helper_fill_fix);
		1191
3480	Serge	1192	/**
		1193	* drm_fb_helper_fill_var - initalizes variable fbdev information
		1194	* @info: fbdev instance to set up
		1195	* @fb_helper: fb helper instance to use as template
		1196	* @fb_width: desired fb width
		1197	* @fb_height: desired fb height
		1198	*
		1199	* Sets up the variable fbdev metainformation from the given fb helper instance
		1200	* and the drm framebuffer allocated in fb_helper->fb.
		1201	*
		1202	* Drivers should call this (or their equivalent setup code) from their
		1203	* ->fb_probe callback after having allocated the fbdev backing
		1204	* storage framebuffer.
		1205	*/
1963	serge	1206	void drm_fb_helper_fill_var(struct fb_info info, struct drm_fb_helper fb_helper,
1179	serge	1207	uint32_t fb_width, uint32_t fb_height)
		1208	{
1963	serge	1209	struct drm_framebuffer *fb = fb_helper->fb;
		1210	info->pseudo_palette = fb_helper->pseudo_palette;
1179	serge	1211	info->var.xres_virtual = fb->width;
		1212	info->var.yres_virtual = fb->height;
		1213	info->var.bits_per_pixel = fb->bits_per_pixel;
1963	serge	1214	info->var.accel_flags = FB_ACCELF_TEXT;
1179	serge	1215	info->var.xoffset = 0;
		1216	info->var.yoffset = 0;
		1217	info->var.activate = FB_ACTIVATE_NOW;
		1218	info->var.height = -1;
		1219	info->var.width = -1;
		1220
		1221	switch (fb->depth) {
		1222	case 8:
		1223	info->var.red.offset = 0;
		1224	info->var.green.offset = 0;
		1225	info->var.blue.offset = 0;
		1226	info->var.red.length = 8; /* 8bit DAC */
		1227	info->var.green.length = 8;
		1228	info->var.blue.length = 8;
		1229	info->var.transp.offset = 0;
		1230	info->var.transp.length = 0;
		1231	break;
		1232	case 15:
		1233	info->var.red.offset = 10;
		1234	info->var.green.offset = 5;
		1235	info->var.blue.offset = 0;
		1236	info->var.red.length = 5;
		1237	info->var.green.length = 5;
		1238	info->var.blue.length = 5;
		1239	info->var.transp.offset = 15;
		1240	info->var.transp.length = 1;
		1241	break;
		1242	case 16:
		1243	info->var.red.offset = 11;
		1244	info->var.green.offset = 5;
		1245	info->var.blue.offset = 0;
		1246	info->var.red.length = 5;
		1247	info->var.green.length = 6;
		1248	info->var.blue.length = 5;
		1249	info->var.transp.offset = 0;
		1250	break;
		1251	case 24:
		1252	info->var.red.offset = 16;
		1253	info->var.green.offset = 8;
		1254	info->var.blue.offset = 0;
		1255	info->var.red.length = 8;
		1256	info->var.green.length = 8;
		1257	info->var.blue.length = 8;
		1258	info->var.transp.offset = 0;
		1259	info->var.transp.length = 0;
		1260	break;
		1261	case 32:
		1262	info->var.red.offset = 16;
		1263	info->var.green.offset = 8;
		1264	info->var.blue.offset = 0;
		1265	info->var.red.length = 8;
		1266	info->var.green.length = 8;
		1267	info->var.blue.length = 8;
		1268	info->var.transp.offset = 24;
		1269	info->var.transp.length = 8;
		1270	break;
		1271	default:
		1272	break;
		1273	}
		1274
		1275	info->var.xres = fb_width;
		1276	info->var.yres = fb_height;
		1277	}
		1278	EXPORT_SYMBOL(drm_fb_helper_fill_var);
1963	serge	1279
		1280	static int drm_fb_helper_probe_connector_modes(struct drm_fb_helper *fb_helper,
		1281	uint32_t maxX,
		1282	uint32_t maxY)
		1283	{
		1284	struct drm_connector *connector;
		1285	int count = 0;
		1286	int i;
		1287
		1288	for (i = 0; i < fb_helper->connector_count; i++) {
		1289	connector = fb_helper->connector_info[i]->connector;
		1290	count += connector->funcs->fill_modes(connector, maxX, maxY);
		1291	}
		1292
		1293	return count;
		1294	}
		1295
5060	serge	1296	struct drm_display_mode drm_has_preferred_mode(struct drm_fb_helper_connector fb_connector, int width, int height)
1963	serge	1297	{
		1298	struct drm_display_mode *mode;
		1299
		1300	list_for_each_entry(mode, &fb_connector->connector->modes, head) {
5060	serge	1301	if (mode->hdisplay > width \|\|
		1302	mode->vdisplay > height)
1963	serge	1303	continue;
		1304	if (mode->type & DRM_MODE_TYPE_PREFERRED)
		1305	return mode;
		1306	}
		1307	return NULL;
		1308	}
5060	serge	1309	EXPORT_SYMBOL(drm_has_preferred_mode);
1963	serge	1310
		1311	static bool drm_has_cmdline_mode(struct drm_fb_helper_connector *fb_connector)
		1312	{
5271	serge	1313	return fb_connector->connector->cmdline_mode.specified;
1963	serge	1314	}
		1315
5060	serge	1316	struct drm_display_mode drm_pick_cmdline_mode(struct drm_fb_helper_connector fb_helper_conn,
3746	Serge	1317	int width, int height)
		1318	{
		1319	struct drm_cmdline_mode *cmdline_mode;
6084	serge	1320	struct drm_display_mode *mode;
5060	serge	1321	bool prefer_non_interlace;
1963	serge	1322
6084	serge	1323	cmdline_mode = &fb_helper_conn->connector->cmdline_mode;
3746	Serge	1324	if (cmdline_mode->specified == false)
6088	serge	1325	return NULL;
3746	Serge	1326
		1327	/* attempt to find a matching mode in the list of modes
		1328	* we have gotten so far, if not add a CVT mode that conforms
		1329	*/
		1330	if (cmdline_mode->rb \|\| cmdline_mode->margins)
		1331	goto create_mode;
		1332
5060	serge	1333	prefer_non_interlace = !cmdline_mode->interlace;
6084	serge	1334	again:
3746	Serge	1335	list_for_each_entry(mode, &fb_helper_conn->connector->modes, head) {
		1336	/* check width/height */
		1337	if (mode->hdisplay != cmdline_mode->xres \|\|
		1338	mode->vdisplay != cmdline_mode->yres)
		1339	continue;
		1340
		1341	if (cmdline_mode->refresh_specified) {
		1342	if (mode->vrefresh != cmdline_mode->refresh)
		1343	continue;
		1344	}
		1345
		1346	if (cmdline_mode->interlace) {
		1347	if (!(mode->flags & DRM_MODE_FLAG_INTERLACE))
		1348	continue;
5060	serge	1349	} else if (prefer_non_interlace) {
		1350	if (mode->flags & DRM_MODE_FLAG_INTERLACE)
		1351	continue;
3746	Serge	1352	}
		1353	return mode;
		1354	}
		1355
5060	serge	1356	if (prefer_non_interlace) {
		1357	prefer_non_interlace = false;
		1358	goto again;
		1359	}
		1360
3746	Serge	1361	create_mode:
		1362	mode = drm_mode_create_from_cmdline_mode(fb_helper_conn->connector->dev,
		1363	cmdline_mode);
		1364	list_add(&mode->head, &fb_helper_conn->connector->modes);
		1365	return mode;
		1366	}
5060	serge	1367	EXPORT_SYMBOL(drm_pick_cmdline_mode);
3746	Serge	1368
1963	serge	1369	static bool drm_connector_enabled(struct drm_connector *connector, bool strict)
		1370	{
		1371	bool enable;
		1372
3192	Serge	1373	if (strict)
1963	serge	1374	enable = connector->status == connector_status_connected;
3192	Serge	1375	else
1963	serge	1376	enable = connector->status != connector_status_disconnected;
3192	Serge	1377
1963	serge	1378	return enable;
		1379	}
		1380
		1381	static void drm_enable_connectors(struct drm_fb_helper *fb_helper,
		1382	bool *enabled)
		1383	{
		1384	bool any_enabled = false;
		1385	struct drm_connector *connector;
		1386	int i = 0;
		1387
		1388	for (i = 0; i < fb_helper->connector_count; i++) {
		1389	connector = fb_helper->connector_info[i]->connector;
		1390	enabled[i] = drm_connector_enabled(connector, true);
		1391	DRM_DEBUG_KMS("connector %d enabled? %s\n", connector->base.id,
		1392	enabled[i] ? "yes" : "no");
		1393	any_enabled \|= enabled[i];
		1394	}
		1395
		1396	if (any_enabled)
		1397	return;
		1398
		1399	for (i = 0; i < fb_helper->connector_count; i++) {
		1400	connector = fb_helper->connector_info[i]->connector;
		1401	enabled[i] = drm_connector_enabled(connector, false);
		1402	}
		1403	}
		1404
3746	Serge	1405	static bool drm_target_cloned(struct drm_fb_helper *fb_helper,
		1406	struct drm_display_mode **modes,
5271	serge	1407	struct drm_fb_offset *offsets,
3746	Serge	1408	bool *enabled, int width, int height)
		1409	{
		1410	int count, i, j;
		1411	bool can_clone = false;
		1412	struct drm_fb_helper_connector *fb_helper_conn;
		1413	struct drm_display_mode dmt_mode, mode;
1963	serge	1414
3746	Serge	1415	/* only contemplate cloning in the single crtc case */
		1416	if (fb_helper->crtc_count > 1)
		1417	return false;
		1418
		1419	count = 0;
		1420	for (i = 0; i < fb_helper->connector_count; i++) {
		1421	if (enabled[i])
		1422	count++;
		1423	}
		1424
		1425	/* only contemplate cloning if more than one connector is enabled */
		1426	if (count <= 1)
		1427	return false;
		1428
		1429	/* check the command line or if nothing common pick 1024x768 */
		1430	can_clone = true;
		1431	for (i = 0; i < fb_helper->connector_count; i++) {
		1432	if (!enabled[i])
		1433	continue;
		1434	fb_helper_conn = fb_helper->connector_info[i];
		1435	modes[i] = drm_pick_cmdline_mode(fb_helper_conn, width, height);
		1436	if (!modes[i]) {
		1437	can_clone = false;
		1438	break;
		1439	}
		1440	for (j = 0; j < i; j++) {
		1441	if (!enabled[j])
		1442	continue;
		1443	if (!drm_mode_equal(modes[j], modes[i]))
		1444	can_clone = false;
		1445	}
		1446	}
		1447
		1448	if (can_clone) {
		1449	DRM_DEBUG_KMS("can clone using command line\n");
		1450	return true;
		1451	}
		1452
		1453	/* try and find a 1024x768 mode on each connector */
		1454	can_clone = true;
		1455	dmt_mode = drm_mode_find_dmt(fb_helper->dev, 1024, 768, 60, false);
		1456
		1457	for (i = 0; i < fb_helper->connector_count; i++) {
		1458
		1459	if (!enabled[i])
		1460	continue;
		1461
		1462	fb_helper_conn = fb_helper->connector_info[i];
		1463	list_for_each_entry(mode, &fb_helper_conn->connector->modes, head) {
		1464	if (drm_mode_equal(mode, dmt_mode))
		1465	modes[i] = mode;
		1466	}
		1467	if (!modes[i])
		1468	can_clone = false;
		1469	}
		1470
		1471	if (can_clone) {
		1472	DRM_DEBUG_KMS("can clone using 1024x768\n");
		1473	return true;
		1474	}
		1475	DRM_INFO("kms: can't enable cloning when we probably wanted to.\n");
		1476	return false;
		1477	}
		1478
5271	serge	1479	static int drm_get_tile_offsets(struct drm_fb_helper *fb_helper,
		1480	struct drm_display_mode **modes,
		1481	struct drm_fb_offset *offsets,
		1482	int idx,
		1483	int h_idx, int v_idx)
		1484	{
		1485	struct drm_fb_helper_connector *fb_helper_conn;
		1486	int i;
		1487	int hoffset = 0, voffset = 0;
		1488
		1489	for (i = 0; i < fb_helper->connector_count; i++) {
		1490	fb_helper_conn = fb_helper->connector_info[i];
		1491	if (!fb_helper_conn->connector->has_tile)
		1492	continue;
		1493
		1494	if (!modes[i] && (h_idx \|\| v_idx)) {
		1495	DRM_DEBUG_KMS("no modes for connector tiled %d %d\n", i,
		1496	fb_helper_conn->connector->base.id);
		1497	continue;
		1498	}
		1499	if (fb_helper_conn->connector->tile_h_loc < h_idx)
		1500	hoffset += modes[i]->hdisplay;
		1501
		1502	if (fb_helper_conn->connector->tile_v_loc < v_idx)
		1503	voffset += modes[i]->vdisplay;
		1504	}
		1505	offsets[idx].x = hoffset;
		1506	offsets[idx].y = voffset;
		1507	DRM_DEBUG_KMS("returned %d %d for %d %d\n", hoffset, voffset, h_idx, v_idx);
		1508	return 0;
		1509	}
		1510
1963	serge	1511	static bool drm_target_preferred(struct drm_fb_helper *fb_helper,
		1512	struct drm_display_mode **modes,
5271	serge	1513	struct drm_fb_offset *offsets,
1963	serge	1514	bool *enabled, int width, int height)
		1515	{
		1516	struct drm_fb_helper_connector *fb_helper_conn;
		1517	int i;
5271	serge	1518	uint64_t conn_configured = 0, mask;
		1519	int tile_pass = 0;
		1520	mask = (1 << fb_helper->connector_count) - 1;
		1521	retry:
1963	serge	1522	for (i = 0; i < fb_helper->connector_count; i++) {
		1523	fb_helper_conn = fb_helper->connector_info[i];
		1524
5271	serge	1525	if (conn_configured & (1 << i))
1963	serge	1526	continue;
		1527
5271	serge	1528	if (enabled[i] == false) {
		1529	conn_configured \|= (1 << i);
		1530	continue;
		1531	}
		1532
		1533	/* first pass over all the untiled connectors */
		1534	if (tile_pass == 0 && fb_helper_conn->connector->has_tile)
		1535	continue;
		1536
		1537	if (tile_pass == 1) {
		1538	if (fb_helper_conn->connector->tile_h_loc != 0 \|\|
		1539	fb_helper_conn->connector->tile_v_loc != 0)
6084	serge	1540	continue;
5271	serge	1541
		1542	} else {
		1543	if (fb_helper_conn->connector->tile_h_loc != tile_pass -1 &&
		1544	fb_helper_conn->connector->tile_v_loc != tile_pass - 1)
		1545	/* if this tile_pass doesn't cover any of the tiles - keep going */
		1546	continue;
		1547
		1548	/* find the tile offsets for this pass - need
		1549	to find all tiles left and above */
		1550	drm_get_tile_offsets(fb_helper, modes, offsets,
		1551	i, fb_helper_conn->connector->tile_h_loc, fb_helper_conn->connector->tile_v_loc);
		1552	}
1963	serge	1553	DRM_DEBUG_KMS("looking for cmdline mode on connector %d\n",
		1554	fb_helper_conn->connector->base.id);
		1555
		1556	/* got for command line mode first */
3746	Serge	1557	modes[i] = drm_pick_cmdline_mode(fb_helper_conn, width, height);
1963	serge	1558	if (!modes[i]) {
5271	serge	1559	DRM_DEBUG_KMS("looking for preferred mode on connector %d %d\n",
		1560	fb_helper_conn->connector->base.id, fb_helper_conn->connector->tile_group ? fb_helper_conn->connector->tile_group->id : 0);
1963	serge	1561	modes[i] = drm_has_preferred_mode(fb_helper_conn, width, height);
		1562	}
		1563	/* No preferred modes, pick one off the list */
		1564	if (!modes[i] && !list_empty(&fb_helper_conn->connector->modes)) {
		1565	list_for_each_entry(modes[i], &fb_helper_conn->connector->modes, head)
		1566	break;
		1567	}
		1568	DRM_DEBUG_KMS("found mode %s\n", modes[i] ? modes[i]->name :
		1569	"none");
5271	serge	1570	conn_configured \|= (1 << i);
1963	serge	1571	}
5271	serge	1572
		1573	if ((conn_configured & mask) != mask) {
		1574	tile_pass++;
		1575	goto retry;
		1576	}
1963	serge	1577	return true;
		1578	}
		1579
		1580	static int drm_pick_crtcs(struct drm_fb_helper *fb_helper,
		1581	struct drm_fb_helper_crtc **best_crtcs,
		1582	struct drm_display_mode **modes,
		1583	int n, int width, int height)
		1584	{
		1585	int c, o;
		1586	struct drm_connector *connector;
6084	serge	1587	const struct drm_connector_helper_funcs *connector_funcs;
1963	serge	1588	struct drm_encoder *encoder;
		1589	int my_score, best_score, score;
		1590	struct drm_fb_helper_crtc *crtcs, crtc;
		1591	struct drm_fb_helper_connector *fb_helper_conn;
		1592
		1593	if (n == fb_helper->connector_count)
		1594	return 0;
		1595
		1596	fb_helper_conn = fb_helper->connector_info[n];
		1597	connector = fb_helper_conn->connector;
		1598
		1599	best_crtcs[n] = NULL;
		1600	best_score = drm_pick_crtcs(fb_helper, best_crtcs, modes, n+1, width, height);
		1601	if (modes[n] == NULL)
		1602	return best_score;
		1603
6660	serge	1604	crtcs = kzalloc(fb_helper->connector_count *
1963	serge	1605	sizeof(struct drm_fb_helper_crtc *), GFP_KERNEL);
		1606	if (!crtcs)
		1607	return best_score;
		1608
		1609	my_score = 1;
		1610	if (connector->status == connector_status_connected)
		1611	my_score++;
		1612	if (drm_has_cmdline_mode(fb_helper_conn))
		1613	my_score++;
		1614	if (drm_has_preferred_mode(fb_helper_conn, width, height))
		1615	my_score++;
		1616
		1617	connector_funcs = connector->helper_private;
		1618	encoder = connector_funcs->best_encoder(connector);
		1619	if (!encoder)
		1620	goto out;
		1621
		1622	/* select a crtc for this connector and then attempt to configure
		1623	remaining connectors */
		1624	for (c = 0; c < fb_helper->crtc_count; c++) {
		1625	crtc = &fb_helper->crtc_info[c];
		1626
3192	Serge	1627	if ((encoder->possible_crtcs & (1 << c)) == 0)
1963	serge	1628	continue;
		1629
		1630	for (o = 0; o < n; o++)
		1631	if (best_crtcs[o] == crtc)
		1632	break;
		1633
		1634	if (o < n) {
		1635	/* ignore cloning unless only a single crtc */
		1636	if (fb_helper->crtc_count > 1)
		1637	continue;
		1638
		1639	if (!drm_mode_equal(modes[o], modes[n]))
		1640	continue;
		1641	}
		1642
		1643	crtcs[n] = crtc;
		1644	memcpy(crtcs, best_crtcs, n * sizeof(struct drm_fb_helper_crtc *));
		1645	score = my_score + drm_pick_crtcs(fb_helper, crtcs, modes, n + 1,
		1646	width, height);
		1647	if (score > best_score) {
		1648	best_score = score;
		1649	memcpy(best_crtcs, crtcs,
6660	serge	1650	fb_helper->connector_count *
1963	serge	1651	sizeof(struct drm_fb_helper_crtc *));
		1652	}
		1653	}
		1654	out:
		1655	kfree(crtcs);
		1656	return best_score;
		1657	}
		1658
		1659	static void drm_setup_crtcs(struct drm_fb_helper *fb_helper)
		1660	{
		1661	struct drm_device *dev = fb_helper->dev;
		1662	struct drm_fb_helper_crtc **crtcs;
		1663	struct drm_display_mode **modes;
5271	serge	1664	struct drm_fb_offset *offsets;
1963	serge	1665	struct drm_mode_set *modeset;
		1666	bool *enabled;
		1667	int width, height;
3746	Serge	1668	int i;
1963	serge	1669
		1670	DRM_DEBUG_KMS("\n");
		1671
		1672	width = dev->mode_config.max_width;
		1673	height = dev->mode_config.max_height;
		1674
7144	serge	1675	crtcs = kcalloc(fb_helper->connector_count,
1963	serge	1676	sizeof(struct drm_fb_helper_crtc *), GFP_KERNEL);
7144	serge	1677	modes = kcalloc(fb_helper->connector_count,
1963	serge	1678	sizeof(struct drm_display_mode *), GFP_KERNEL);
7144	serge	1679	offsets = kcalloc(fb_helper->connector_count,
5271	serge	1680	sizeof(struct drm_fb_offset), GFP_KERNEL);
7144	serge	1681	enabled = kcalloc(fb_helper->connector_count,
1963	serge	1682	sizeof(bool), GFP_KERNEL);
5271	serge	1683	if (!crtcs \|\| !modes \|\| !enabled \|\| !offsets) {
3192	Serge	1684	DRM_ERROR("Memory allocation failed\n");
		1685	goto out;
		1686	}
1963	serge	1687
3192	Serge	1688
1963	serge	1689	drm_enable_connectors(fb_helper, enabled);
		1690
3746	Serge	1691	if (!(fb_helper->funcs->initial_config &&
		1692	fb_helper->funcs->initial_config(fb_helper, crtcs, modes,
5271	serge	1693	offsets,
3746	Serge	1694	enabled, width, height))) {
7144	serge	1695	memset(modes, 0, fb_helper->connector_count*sizeof(modes[0]));
		1696	memset(crtcs, 0, fb_helper->connector_count*sizeof(crtcs[0]));
		1697	memset(offsets, 0, fb_helper->connector_count*sizeof(offsets[0]));
1963	serge	1698
5271	serge	1699	if (!drm_target_cloned(fb_helper, modes, offsets,
		1700	enabled, width, height) &&
		1701	!drm_target_preferred(fb_helper, modes, offsets,
		1702	enabled, width, height))
1963	serge	1703	DRM_ERROR("Unable to find initial modes\n");
		1704
3746	Serge	1705	DRM_DEBUG_KMS("picking CRTCs for %dx%d config\n",
		1706	width, height);
1963	serge	1707
6084	serge	1708	drm_pick_crtcs(fb_helper, crtcs, modes, 0, width, height);
3746	Serge	1709	}
1963	serge	1710
		1711	/* need to set the modesets up here for use later */
		1712	/* fill out the connector<->crtc mappings into the modesets */
		1713	for (i = 0; i < fb_helper->crtc_count; i++) {
		1714	modeset = &fb_helper->crtc_info[i].mode_set;
		1715	modeset->num_connectors = 0;
3480	Serge	1716	modeset->fb = NULL;
1963	serge	1717	}
		1718
		1719	for (i = 0; i < fb_helper->connector_count; i++) {
		1720	struct drm_display_mode *mode = modes[i];
		1721	struct drm_fb_helper_crtc *fb_crtc = crtcs[i];
5271	serge	1722	struct drm_fb_offset *offset = &offsets[i];
1963	serge	1723	modeset = &fb_crtc->mode_set;
		1724
		1725	if (mode && fb_crtc) {
5271	serge	1726	DRM_DEBUG_KMS("desired mode %s set on crtc %d (%d,%d)\n",
		1727	mode->name, fb_crtc->mode_set.crtc->base.id, offset->x, offset->y);
1963	serge	1728	fb_crtc->desired_mode = mode;
5271	serge	1729	fb_crtc->x = offset->x;
		1730	fb_crtc->y = offset->y;
1963	serge	1731	if (modeset->mode)
		1732	drm_mode_destroy(dev, modeset->mode);
		1733	modeset->mode = drm_mode_duplicate(dev,
		1734	fb_crtc->desired_mode);
		1735	modeset->connectors[modeset->num_connectors++] = fb_helper->connector_info[i]->connector;
3480	Serge	1736	modeset->fb = fb_helper->fb;
5271	serge	1737	modeset->x = offset->x;
		1738	modeset->y = offset->y;
1963	serge	1739	}
		1740	}
		1741
3480	Serge	1742	/* Clear out any old modes if there are no more connected outputs. */
		1743	for (i = 0; i < fb_helper->crtc_count; i++) {
		1744	modeset = &fb_helper->crtc_info[i].mode_set;
		1745	if (modeset->num_connectors == 0) {
		1746	BUG_ON(modeset->fb);
		1747	if (modeset->mode)
		1748	drm_mode_destroy(dev, modeset->mode);
		1749	modeset->mode = NULL;
		1750	}
		1751	}
3192	Serge	1752	out:
1963	serge	1753	kfree(crtcs);
		1754	kfree(modes);
5271	serge	1755	kfree(offsets);
1963	serge	1756	kfree(enabled);
		1757	}
		1758
		1759	/**
3480	Serge	1760	* drm_fb_helper_initial_config - setup a sane initial connector configuration
3192	Serge	1761	* @fb_helper: fb_helper device struct
		1762	* @bpp_sel: bpp value to use for the framebuffer configuration
1963	serge	1763	*
3192	Serge	1764	* Scans the CRTCs and connectors and tries to put together an initial setup.
1963	serge	1765	* At the moment, this is a cloned configuration across all heads with
		1766	* a new framebuffer object as the backing store.
		1767	*
3480	Serge	1768	* Note that this also registers the fbdev and so allows userspace to call into
		1769	* the driver through the fbdev interfaces.
		1770	*
		1771	* This function will call down into the ->fb_probe callback to let
		1772	* the driver allocate and initialize the fbdev info structure and the drm
		1773	* framebuffer used to back the fbdev. drm_fb_helper_fill_var() and
		1774	* drm_fb_helper_fill_fix() are provided as helpers to setup simple default
		1775	* values for the fbdev info structure.
		1776	*
7144	serge	1777	* HANG DEBUGGING:
		1778	*
		1779	* When you have fbcon support built-in or already loaded, this function will do
		1780	* a full modeset to setup the fbdev console. Due to locking misdesign in the
		1781	* VT/fbdev subsystem that entire modeset sequence has to be done while holding
		1782	* console_lock. Until console_unlock is called no dmesg lines will be sent out
		1783	* to consoles, not even serial console. This means when your driver crashes,
		1784	* you will see absolutely nothing else but a system stuck in this function,
		1785	* with no further output. Any kind of printk() you place within your own driver
		1786	* or in the drm core modeset code will also never show up.
		1787	*
		1788	* Standard debug practice is to run the fbcon setup without taking the
		1789	* console_lock as a hack, to be able to see backtraces and crashes on the
		1790	* serial line. This can be done by setting the fb.lockless_register_fb=1 kernel
		1791	* cmdline option.
		1792	*
		1793	* The other option is to just disable fbdev emulation since very likely the
		1794	* first modest from userspace will crash in the same way, and is even easier to
		1795	* debug. This can be done by setting the drm_kms_helper.fbdev_emulation=0
		1796	* kernel cmdline option.
		1797	*
1963	serge	1798	* RETURNS:
		1799	* Zero if everything went ok, nonzero otherwise.
		1800	*/
6084	serge	1801	int drm_fb_helper_initial_config(struct drm_fb_helper *fb_helper, int bpp_sel)
1963	serge	1802	{
		1803	struct drm_device *dev = fb_helper->dev;
		1804	int count = 0;
		1805
6084	serge	1806	if (!drm_fbdev_emulation)
		1807	return 0;
		1808
5060	serge	1809	mutex_lock(&dev->mode_config.mutex);
1963	serge	1810	count = drm_fb_helper_probe_connector_modes(fb_helper,
		1811	dev->mode_config.max_width,
		1812	dev->mode_config.max_height);
5060	serge	1813	mutex_unlock(&dev->mode_config.mutex);
1963	serge	1814	/*
		1815	* we shouldn't end up with no modes here.
		1816	*/
3192	Serge	1817	if (count == 0)
		1818	dev_info(fb_helper->dev->dev, "No connectors reported connected with modes\n");
		1819
		1820	drm_setup_crtcs(fb_helper);
		1821
3243	Serge	1822	return drm_fb_helper_single_fb_probe(fb_helper, bpp_sel);
3192	Serge	1823	}
		1824	EXPORT_SYMBOL(drm_fb_helper_initial_config);
		1825
		1826	/**
		1827	* drm_fb_helper_hotplug_event - respond to a hotplug notification by
		1828	* probing all the outputs attached to the fb
		1829	* @fb_helper: the drm_fb_helper
		1830	*
		1831	* Scan the connectors attached to the fb_helper and try to put together a
		1832	* setup after *notification of a change in output configuration.
		1833	*
3480	Serge	1834	* Called at runtime, takes the mode config locks to be able to check/change the
		1835	* modeset configuration. Must be run from process context (which usually means
		1836	* either the output polling work or a work item launched from the driver's
		1837	* hotplug interrupt).
		1838	*
5060	serge	1839	* Note that drivers may call this even before calling
		1840	* drm_fb_helper_initial_config but only aftert drm_fb_helper_init. This allows
		1841	* for a race-free fbcon setup and will make sure that the fbdev emulation will
		1842	* not miss any hotplug events.
3480	Serge	1843	*
3192	Serge	1844	* RETURNS:
		1845	* 0 on success and a non-zero error code otherwise.
		1846	*/
		1847	int drm_fb_helper_hotplug_event(struct drm_fb_helper *fb_helper)
		1848	{
		1849	struct drm_device *dev = fb_helper->dev;
4560	Serge	1850	u32 max_width, max_height;
3192	Serge	1851
7144	serge	1852	ENTER();
		1853
6084	serge	1854	if (!drm_fbdev_emulation)
		1855	return 0;
		1856
3480	Serge	1857	mutex_lock(&fb_helper->dev->mode_config.mutex);
5060	serge	1858	if (!fb_helper->fb \|\| !drm_fb_helper_is_bound(fb_helper)) {
3192	Serge	1859	fb_helper->delayed_hotplug = true;
3480	Serge	1860	mutex_unlock(&fb_helper->dev->mode_config.mutex);
3192	Serge	1861	return 0;
		1862	}
		1863	DRM_DEBUG_KMS("\n");
		1864
6296	serge	1865	max_width = 8192; //fb_helper->fb->width;
		1866	max_height = 8192; //fb_helper->fb->height;
3192	Serge	1867
4560	Serge	1868	drm_fb_helper_probe_connector_modes(fb_helper, max_width, max_height);
3480	Serge	1869	mutex_unlock(&fb_helper->dev->mode_config.mutex);
		1870
6296	serge	1871	// drm_modeset_lock_all(dev);
		1872	// drm_setup_crtcs(fb_helper);
		1873	// drm_modeset_unlock_all(dev);
		1874	// drm_fb_helper_set_par(fb_helper->fbdev);
7144	serge	1875	LEAVE();
3480	Serge	1876	return 0;
1963	serge	1877	}
3192	Serge	1878	EXPORT_SYMBOL(drm_fb_helper_hotplug_event);
		1879
4560	Serge	1880	/* The Kconfig DRM_KMS_HELPER selects FRAMEBUFFER_CONSOLE (if !EXPERT)
		1881	* but the module doesn't depend on any fb console symbols. At least
		1882	* attempt to load fbcon to avoid leaving the system without a usable console.
		1883	*/
7144	serge	1884	int __init drm_fb_helper_modinit(void)
		1885	{
4560	Serge	1886	#if defined(CONFIG_FRAMEBUFFER_CONSOLE_MODULE) && !defined(CONFIG_EXPERT)
		1887	const char *name = "fbcon";
		1888	struct module *fbcon;
3192	Serge	1889
4560	Serge	1890	mutex_lock(&module_mutex);
		1891	fbcon = find_module(name);
		1892	mutex_unlock(&module_mutex);
3192	Serge	1893
4560	Serge	1894	if (!fbcon)
		1895	request_module_nowait(name);
7144	serge	1896	#endif
4560	Serge	1897	return 0;
		1898	}
7144	serge	1899	EXPORT_SYMBOL(drm_fb_helper_modinit);

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(root)/drivers/video/drm/drm_fb_helper.c @ 1233 – Rev 7144