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

Subversion Repositories Kolibri OS

(root)/drivers/video/drm/drm_fb_helper.c – Rev 6296