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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 
1179 serge 41
 
42
static LIST_HEAD(kernel_fb_helper_list);
43
 
3192 Serge 44
/**
45
 * DOC: fbdev helpers
46
 *
47
 * The fb helper functions are useful to provide an fbdev on top of a drm kernel
5060 serge 48
 * mode setting driver. They can be used mostly independently from the crtc
3192 Serge 49
 * helper functions used by many drivers to implement the kernel mode setting
50
 * interfaces.
3480 Serge 51
 *
5060 serge 52
 * Initialization is done as a four-step process with drm_fb_helper_prepare(),
53
 * drm_fb_helper_init(), drm_fb_helper_single_add_all_connectors() and
54
 * drm_fb_helper_initial_config(). Drivers with fancier requirements than the
55
 * default behaviour can override the third step with their own code.
56
 * Teardown is done with drm_fb_helper_fini().
3480 Serge 57
 *
58
 * At runtime drivers should restore the fbdev console by calling
59
 * drm_fb_helper_restore_fbdev_mode() from their ->lastclose callback. They
60
 * should also notify the fb helper code from updates to the output
61
 * configuration by calling drm_fb_helper_hotplug_event(). For easier
62
 * integration with the output polling code in drm_crtc_helper.c the modeset
5060 serge 63
 * code provides a ->output_poll_changed callback.
3480 Serge 64
 *
65
 * All other functions exported by the fb helper library can be used to
66
 * implement the fbdev driver interface by the driver.
5060 serge 67
 *
68
 * It is possible, though perhaps somewhat tricky, to implement race-free
69
 * hotplug detection using the fbdev helpers. The drm_fb_helper_prepare()
70
 * helper must be called first to initialize the minimum required to make
71
 * hotplug detection work. Drivers also need to make sure to properly set up
72
 * the dev->mode_config.funcs member. After calling drm_kms_helper_poll_init()
73
 * it is safe to enable interrupts and start processing hotplug events. At the
74
 * same time, drivers should initialize all modeset objects such as CRTCs,
75
 * encoders and connectors. To finish up the fbdev helper initialization, the
76
 * drm_fb_helper_init() function is called. To probe for all attached displays
77
 * and set up an initial configuration using the detected hardware, drivers
78
 * should call drm_fb_helper_single_add_all_connectors() followed by
79
 * drm_fb_helper_initial_config().
3192 Serge 80
 */
81
 
3480 Serge 82
/**
83
 * drm_fb_helper_single_add_all_connectors() - add all connectors to fbdev
84
 * 					       emulation helper
85
 * @fb_helper: fbdev initialized with drm_fb_helper_init
86
 *
87
 * This functions adds all the available connectors for use with the given
88
 * fb_helper. This is a separate step to allow drivers to freely assign
89
 * connectors to the fbdev, e.g. if some are reserved for special purposes or
90
 * not adequate to be used for the fbcon.
91
 *
92
 * Since this is part of the initial setup before the fbdev is published, no
93
 * locking is required.
94
 */
1963 serge 95
int drm_fb_helper_single_add_all_connectors(struct drm_fb_helper *fb_helper)
1221 serge 96
{
1963 serge 97
	struct drm_device *dev = fb_helper->dev;
98
	struct drm_connector *connector;
99
	int i;
1221 serge 100
 
1963 serge 101
	list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
102
		struct drm_fb_helper_connector *fb_helper_connector;
103
 
104
		fb_helper_connector = kzalloc(sizeof(struct drm_fb_helper_connector), GFP_KERNEL);
105
		if (!fb_helper_connector)
106
			goto fail;
107
 
108
		fb_helper_connector->connector = connector;
109
		fb_helper->connector_info[fb_helper->connector_count++] = fb_helper_connector;
110
	}
1221 serge 111
	return 0;
1963 serge 112
fail:
113
	for (i = 0; i < fb_helper->connector_count; i++) {
114
		kfree(fb_helper->connector_info[i]);
115
		fb_helper->connector_info[i] = NULL;
116
	}
117
	fb_helper->connector_count = 0;
118
    return -ENOMEM;
1221 serge 119
}
1963 serge 120
EXPORT_SYMBOL(drm_fb_helper_single_add_all_connectors);
1221 serge 121
 
5060 serge 122
int drm_fb_helper_add_one_connector(struct drm_fb_helper *fb_helper, struct drm_connector *connector)
123
{
124
	struct drm_fb_helper_connector **temp;
125
	struct drm_fb_helper_connector *fb_helper_connector;
126
 
127
	WARN_ON(!mutex_is_locked(&fb_helper->dev->mode_config.mutex));
128
	if (fb_helper->connector_count + 1 > fb_helper->connector_info_alloc_count) {
129
		temp = krealloc(fb_helper->connector_info, sizeof(struct drm_fb_helper_connector) * (fb_helper->connector_count + 1), GFP_KERNEL);
130
		if (!temp)
131
			return -ENOMEM;
132
 
133
		fb_helper->connector_info_alloc_count = fb_helper->connector_count + 1;
134
		fb_helper->connector_info = temp;
135
	}
136
 
137
 
138
	fb_helper_connector = kzalloc(sizeof(struct drm_fb_helper_connector), GFP_KERNEL);
139
	if (!fb_helper_connector)
140
		return -ENOMEM;
141
 
142
	fb_helper_connector->connector = connector;
143
	fb_helper->connector_info[fb_helper->connector_count++] = fb_helper_connector;
144
	return 0;
145
}
146
EXPORT_SYMBOL(drm_fb_helper_add_one_connector);
147
 
148
int drm_fb_helper_remove_one_connector(struct drm_fb_helper *fb_helper,
149
				       struct drm_connector *connector)
150
{
151
	struct drm_fb_helper_connector *fb_helper_connector;
152
	int i, j;
153
 
154
	WARN_ON(!mutex_is_locked(&fb_helper->dev->mode_config.mutex));
155
 
156
	for (i = 0; i < fb_helper->connector_count; i++) {
157
		if (fb_helper->connector_info[i]->connector == connector)
158
			break;
159
	}
160
 
161
	if (i == fb_helper->connector_count)
162
		return -EINVAL;
163
	fb_helper_connector = fb_helper->connector_info[i];
164
 
165
	for (j = i + 1; j < fb_helper->connector_count; j++) {
166
		fb_helper->connector_info[j - 1] = fb_helper->connector_info[j];
167
	}
168
	fb_helper->connector_count--;
169
	kfree(fb_helper_connector);
170
	return 0;
171
}
172
EXPORT_SYMBOL(drm_fb_helper_remove_one_connector);
1963 serge 173
static void drm_fb_helper_save_lut_atomic(struct drm_crtc *crtc, struct drm_fb_helper *helper)
1179 serge 174
{
1963 serge 175
	uint16_t *r_base, *g_base, *b_base;
176
	int i;
1179 serge 177
 
4104 Serge 178
	if (helper->funcs->gamma_get == NULL)
179
		return;
180
 
1963 serge 181
	r_base = crtc->gamma_store;
182
	g_base = r_base + crtc->gamma_size;
183
	b_base = g_base + crtc->gamma_size;
1179 serge 184
 
1963 serge 185
	for (i = 0; i < crtc->gamma_size; i++)
186
		helper->funcs->gamma_get(crtc, &r_base[i], &g_base[i], &b_base[i], i);
1179 serge 187
}
188
 
1963 serge 189
static void drm_fb_helper_restore_lut_atomic(struct drm_crtc *crtc)
1179 serge 190
{
1963 serge 191
	uint16_t *r_base, *g_base, *b_base;
192
 
3031 serge 193
	if (crtc->funcs->gamma_set == NULL)
194
		return;
195
 
1963 serge 196
	r_base = crtc->gamma_store;
197
	g_base = r_base + crtc->gamma_size;
198
	b_base = g_base + crtc->gamma_size;
199
 
200
	crtc->funcs->gamma_set(crtc, r_base, g_base, b_base, 0, crtc->gamma_size);
1179 serge 201
}
202
 
203
 
5060 serge 204
static bool restore_fbdev_mode(struct drm_fb_helper *fb_helper)
205
{
206
	struct drm_device *dev = fb_helper->dev;
207
	struct drm_plane *plane;
208
	bool error = false;
209
	int i;
210
 
211
	drm_warn_on_modeset_not_all_locked(dev);
212
 
213
	list_for_each_entry(plane, &dev->mode_config.plane_list, head)
214
		if (plane->type != DRM_PLANE_TYPE_PRIMARY)
215
			drm_plane_force_disable(plane);
216
 
217
	for (i = 0; i < fb_helper->crtc_count; i++) {
218
		struct drm_mode_set *mode_set = &fb_helper->crtc_info[i].mode_set;
219
		struct drm_crtc *crtc = mode_set->crtc;
220
		int ret;
221
 
222
		if (crtc->funcs->cursor_set) {
223
			ret = crtc->funcs->cursor_set(crtc, NULL, 0, 0, 0);
224
			if (ret)
225
				error = true;
226
		}
227
 
228
		ret = drm_mode_set_config_internal(mode_set);
229
		if (ret)
230
			error = true;
231
	}
232
	return error;
233
}
234
/**
235
 * drm_fb_helper_restore_fbdev_mode_unlocked - restore fbdev configuration
236
 * @fb_helper: fbcon to restore
237
 *
238
 * This should be called from driver's drm ->lastclose callback
239
 * when implementing an fbcon on top of kms using this helper. This ensures that
240
 * the user isn't greeted with a black screen when e.g. X dies.
241
 */
242
bool drm_fb_helper_restore_fbdev_mode_unlocked(struct drm_fb_helper *fb_helper)
243
{
244
	struct drm_device *dev = fb_helper->dev;
245
	bool ret;
246
	drm_modeset_lock_all(dev);
247
	ret = restore_fbdev_mode(fb_helper);
248
	drm_modeset_unlock_all(dev);
249
	return ret;
250
}
251
EXPORT_SYMBOL(drm_fb_helper_restore_fbdev_mode_unlocked);
252
 
3480 Serge 253
static bool drm_fb_helper_is_bound(struct drm_fb_helper *fb_helper)
254
{
255
	struct drm_device *dev = fb_helper->dev;
256
	struct drm_crtc *crtc;
257
	int bound = 0, crtcs_bound = 0;
1179 serge 258
 
3480 Serge 259
	list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) {
5060 serge 260
		if (crtc->primary->fb)
3480 Serge 261
			crtcs_bound++;
5060 serge 262
		if (crtc->primary->fb == fb_helper->fb)
3480 Serge 263
			bound++;
264
	}
265
 
266
	if (bound < crtcs_bound)
267
		return false;
4560 Serge 268
 
3480 Serge 269
	return true;
270
}
271
 
4560 Serge 272
#ifdef CONFIG_MAGIC_SYSRQ
273
static void drm_fb_helper_restore_work_fn(struct work_struct *ignored)
274
{
275
	bool ret;
276
	ret = drm_fb_helper_force_kernel_mode();
277
	if (ret == true)
278
		DRM_ERROR("Failed to restore crtc configuration\n");
279
}
280
static DECLARE_WORK(drm_fb_helper_restore_work, drm_fb_helper_restore_work_fn);
281
 
282
static void drm_fb_helper_sysrq(int dummy1)
283
{
284
	schedule_work(&drm_fb_helper_restore_work);
285
}
286
 
287
static struct sysrq_key_op sysrq_drm_fb_helper_restore_op = {
288
	.handler = drm_fb_helper_sysrq,
289
	.help_msg = "force-fb(V)",
290
	.action_msg = "Restore framebuffer console",
291
};
292
#else
293
 
294
#endif
295
 
3031 serge 296
static void drm_fb_helper_dpms(struct fb_info *info, int dpms_mode)
1179 serge 297
{
298
	struct drm_fb_helper *fb_helper = info->par;
299
	struct drm_device *dev = fb_helper->dev;
300
	struct drm_crtc *crtc;
1963 serge 301
	struct drm_connector *connector;
302
	int i, j;
1179 serge 303
 
304
	/*
3480 Serge 305
	 * fbdev->blank can be called from irq context in case of a panic.
306
	 * Since we already have our own special panic handler which will
307
	 * restore the fbdev console mode completely, just bail out early.
308
	 */
309
 
310
	/*
3031 serge 311
	 * For each CRTC in this fb, turn the connectors on/off.
1179 serge 312
	 */
3480 Serge 313
	drm_modeset_lock_all(dev);
314
	if (!drm_fb_helper_is_bound(fb_helper)) {
315
		drm_modeset_unlock_all(dev);
316
		return;
317
	}
318
 
1179 serge 319
	for (i = 0; i < fb_helper->crtc_count; i++) {
1963 serge 320
		crtc = fb_helper->crtc_info[i].mode_set.crtc;
1179 serge 321
 
1963 serge 322
		if (!crtc->enabled)
1179 serge 323
				continue;
324
 
3031 serge 325
		/* Walk the connectors & encoders on this fb turning them on/off */
1963 serge 326
		for (j = 0; j < fb_helper->connector_count; j++) {
327
			connector = fb_helper->connector_info[j]->connector;
3031 serge 328
			connector->funcs->dpms(connector, dpms_mode);
3192 Serge 329
			drm_object_property_set_value(&connector->base,
3031 serge 330
				dev->mode_config.dpms_property, dpms_mode);
1963 serge 331
		}
332
	}
3480 Serge 333
	drm_modeset_unlock_all(dev);
1179 serge 334
}
335
 
3480 Serge 336
/**
337
 * drm_fb_helper_blank - implementation for ->fb_blank
338
 * @blank: desired blanking state
339
 * @info: fbdev registered by the helper
340
 */
1179 serge 341
int drm_fb_helper_blank(int blank, struct fb_info *info)
342
{
343
	switch (blank) {
1321 serge 344
	/* Display: On; HSync: On, VSync: On */
1179 serge 345
	case FB_BLANK_UNBLANK:
3031 serge 346
		drm_fb_helper_dpms(info, DRM_MODE_DPMS_ON);
1179 serge 347
		break;
1321 serge 348
	/* Display: Off; HSync: On, VSync: On */
1179 serge 349
	case FB_BLANK_NORMAL:
3031 serge 350
		drm_fb_helper_dpms(info, DRM_MODE_DPMS_STANDBY);
1179 serge 351
		break;
1321 serge 352
	/* Display: Off; HSync: Off, VSync: On */
1179 serge 353
	case FB_BLANK_HSYNC_SUSPEND:
3031 serge 354
		drm_fb_helper_dpms(info, DRM_MODE_DPMS_STANDBY);
1179 serge 355
		break;
1321 serge 356
	/* Display: Off; HSync: On, VSync: Off */
1179 serge 357
	case FB_BLANK_VSYNC_SUSPEND:
3031 serge 358
		drm_fb_helper_dpms(info, DRM_MODE_DPMS_SUSPEND);
1179 serge 359
		break;
1321 serge 360
	/* Display: Off; HSync: Off, VSync: Off */
1179 serge 361
	case FB_BLANK_POWERDOWN:
3031 serge 362
		drm_fb_helper_dpms(info, DRM_MODE_DPMS_OFF);
1179 serge 363
		break;
364
	}
365
	return 0;
366
}
367
EXPORT_SYMBOL(drm_fb_helper_blank);
368
 
369
static void drm_fb_helper_crtc_free(struct drm_fb_helper *helper)
370
{
371
	int i;
372
 
1963 serge 373
	for (i = 0; i < helper->connector_count; i++)
374
		kfree(helper->connector_info[i]);
375
	kfree(helper->connector_info);
3031 serge 376
	for (i = 0; i < helper->crtc_count; i++) {
1179 serge 377
		kfree(helper->crtc_info[i].mode_set.connectors);
3031 serge 378
		if (helper->crtc_info[i].mode_set.mode)
379
			drm_mode_destroy(helper->dev, helper->crtc_info[i].mode_set.mode);
380
	}
1179 serge 381
	kfree(helper->crtc_info);
382
}
383
 
3480 Serge 384
/**
5060 serge 385
 * drm_fb_helper_prepare - setup a drm_fb_helper structure
386
 * @dev: DRM device
387
 * @helper: driver-allocated fbdev helper structure to set up
388
 * @funcs: pointer to structure of functions associate with this helper
389
 *
390
 * Sets up the bare minimum to make the framebuffer helper usable. This is
391
 * useful to implement race-free initialization of the polling helpers.
392
 */
393
void drm_fb_helper_prepare(struct drm_device *dev, struct drm_fb_helper *helper,
394
			   const struct drm_fb_helper_funcs *funcs)
395
{
396
	INIT_LIST_HEAD(&helper->kernel_fb_list);
397
	helper->funcs = funcs;
398
	helper->dev = dev;
399
}
400
EXPORT_SYMBOL(drm_fb_helper_prepare);
401
 
402
/**
3480 Serge 403
 * drm_fb_helper_init - initialize a drm_fb_helper structure
404
 * @dev: drm device
405
 * @fb_helper: driver-allocated fbdev helper structure to initialize
406
 * @crtc_count: maximum number of crtcs to support in this fbdev emulation
407
 * @max_conn_count: max connector count
408
 *
409
 * This allocates the structures for the fbdev helper with the given limits.
410
 * Note that this won't yet touch the hardware (through the driver interfaces)
411
 * nor register the fbdev. This is only done in drm_fb_helper_initial_config()
412
 * to allow driver writes more control over the exact init sequence.
413
 *
5060 serge 414
 * Drivers must call drm_fb_helper_prepare() before calling this function.
3480 Serge 415
 *
416
 * RETURNS:
417
 * Zero if everything went ok, nonzero otherwise.
418
 */
1963 serge 419
int drm_fb_helper_init(struct drm_device *dev,
420
		       struct drm_fb_helper *fb_helper,
421
		       int crtc_count, int max_conn_count)
1179 serge 422
{
423
	struct drm_crtc *crtc;
424
	int i;
425
 
5060 serge 426
	if (!max_conn_count)
427
		return -EINVAL;
1963 serge 428
 
429
	fb_helper->crtc_info = kcalloc(crtc_count, sizeof(struct drm_fb_helper_crtc), GFP_KERNEL);
430
	if (!fb_helper->crtc_info)
1179 serge 431
		return -ENOMEM;
432
 
1963 serge 433
	fb_helper->crtc_count = crtc_count;
434
	fb_helper->connector_info = kcalloc(dev->mode_config.num_connector, sizeof(struct drm_fb_helper_connector *), GFP_KERNEL);
435
	if (!fb_helper->connector_info) {
436
		kfree(fb_helper->crtc_info);
437
		return -ENOMEM;
438
	}
5060 serge 439
	fb_helper->connector_info_alloc_count = dev->mode_config.num_connector;
1963 serge 440
	fb_helper->connector_count = 0;
1179 serge 441
 
442
	for (i = 0; i < crtc_count; i++) {
1963 serge 443
		fb_helper->crtc_info[i].mode_set.connectors =
1179 serge 444
			kcalloc(max_conn_count,
445
				sizeof(struct drm_connector *),
446
				GFP_KERNEL);
447
 
3031 serge 448
		if (!fb_helper->crtc_info[i].mode_set.connectors)
1179 serge 449
			goto out_free;
1963 serge 450
		fb_helper->crtc_info[i].mode_set.num_connectors = 0;
1179 serge 451
	}
452
 
453
	i = 0;
454
	list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) {
1963 serge 455
		fb_helper->crtc_info[i].mode_set.crtc = crtc;
1179 serge 456
		i++;
457
	}
3031 serge 458
 
1179 serge 459
	return 0;
460
out_free:
1963 serge 461
	drm_fb_helper_crtc_free(fb_helper);
1179 serge 462
	return -ENOMEM;
463
}
1963 serge 464
EXPORT_SYMBOL(drm_fb_helper_init);
1179 serge 465
 
1246 serge 466
static int setcolreg(struct drm_crtc *crtc, u16 red, u16 green,
1221 serge 467
		     u16 blue, u16 regno, struct fb_info *info)
468
{
469
	struct drm_fb_helper *fb_helper = info->par;
470
	struct drm_framebuffer *fb = fb_helper->fb;
471
	int pindex;
472
 
1246 serge 473
	if (info->fix.visual == FB_VISUAL_TRUECOLOR) {
474
		u32 *palette;
475
		u32 value;
476
		/* place color in psuedopalette */
477
		if (regno > 16)
478
			return -EINVAL;
479
		palette = (u32 *)info->pseudo_palette;
480
		red >>= (16 - info->var.red.length);
481
		green >>= (16 - info->var.green.length);
482
		blue >>= (16 - info->var.blue.length);
483
		value = (red << info->var.red.offset) |
484
			(green << info->var.green.offset) |
485
			(blue << info->var.blue.offset);
1963 serge 486
		if (info->var.transp.length > 0) {
487
			u32 mask = (1 << info->var.transp.length) - 1;
488
			mask <<= info->var.transp.offset;
489
			value |= mask;
490
		}
1246 serge 491
		palette[regno] = value;
492
		return 0;
493
	}
494
 
4104 Serge 495
	/*
496
	 * The driver really shouldn't advertise pseudo/directcolor
497
	 * visuals if it can't deal with the palette.
498
	 */
499
	if (WARN_ON(!fb_helper->funcs->gamma_set ||
500
		    !fb_helper->funcs->gamma_get))
501
		return -EINVAL;
502
 
1221 serge 503
	pindex = regno;
504
 
505
	if (fb->bits_per_pixel == 16) {
506
		pindex = regno << 3;
507
 
508
		if (fb->depth == 16 && regno > 63)
1246 serge 509
			return -EINVAL;
1221 serge 510
		if (fb->depth == 15 && regno > 31)
1246 serge 511
			return -EINVAL;
1221 serge 512
 
513
		if (fb->depth == 16) {
514
			u16 r, g, b;
515
			int i;
516
			if (regno < 32) {
517
				for (i = 0; i < 8; i++)
518
					fb_helper->funcs->gamma_set(crtc, red,
519
						green, blue, pindex + i);
520
			}
521
 
522
			fb_helper->funcs->gamma_get(crtc, &r,
523
						    &g, &b,
524
						    pindex >> 1);
525
 
526
			for (i = 0; i < 4; i++)
527
				fb_helper->funcs->gamma_set(crtc, r,
528
							    green, b,
529
							    (pindex >> 1) + i);
530
		}
531
	}
532
 
533
	if (fb->depth != 16)
534
		fb_helper->funcs->gamma_set(crtc, red, green, blue, pindex);
1246 serge 535
	return 0;
1221 serge 536
}
537
 
3480 Serge 538
/**
539
 * drm_fb_helper_setcmap - implementation for ->fb_setcmap
540
 * @cmap: cmap to set
541
 * @info: fbdev registered by the helper
542
 */
1221 serge 543
int drm_fb_helper_setcmap(struct fb_cmap *cmap, struct fb_info *info)
544
{
545
	struct drm_fb_helper *fb_helper = info->par;
4104 Serge 546
	struct drm_device *dev = fb_helper->dev;
1963 serge 547
	struct drm_crtc_helper_funcs *crtc_funcs;
1221 serge 548
	u16 *red, *green, *blue, *transp;
549
	struct drm_crtc *crtc;
1963 serge 550
	int i, j, rc = 0;
1221 serge 551
	int start;
552
 
4104 Serge 553
	drm_modeset_lock_all(dev);
554
	if (!drm_fb_helper_is_bound(fb_helper)) {
555
		drm_modeset_unlock_all(dev);
556
		return -EBUSY;
557
	}
558
 
1221 serge 559
		for (i = 0; i < fb_helper->crtc_count; i++) {
1963 serge 560
		crtc = fb_helper->crtc_info[i].mode_set.crtc;
561
		crtc_funcs = crtc->helper_private;
1221 serge 562
 
563
		red = cmap->red;
564
		green = cmap->green;
565
		blue = cmap->blue;
566
		transp = cmap->transp;
567
		start = cmap->start;
568
 
1963 serge 569
		for (j = 0; j < cmap->len; j++) {
1221 serge 570
			u16 hred, hgreen, hblue, htransp = 0xffff;
571
 
572
			hred = *red++;
573
			hgreen = *green++;
574
			hblue = *blue++;
575
 
576
			if (transp)
577
				htransp = *transp++;
578
 
1246 serge 579
			rc = setcolreg(crtc, hred, hgreen, hblue, start++, info);
580
			if (rc)
4104 Serge 581
				goto out;
1221 serge 582
		}
4104 Serge 583
		if (crtc_funcs->load_lut)
1221 serge 584
		crtc_funcs->load_lut(crtc);
585
	}
4104 Serge 586
 out:
587
	drm_modeset_unlock_all(dev);
1221 serge 588
	return rc;
589
}
590
EXPORT_SYMBOL(drm_fb_helper_setcmap);
591
 
3480 Serge 592
/**
593
 * drm_fb_helper_check_var - implementation for ->fb_check_var
594
 * @var: screeninfo to check
595
 * @info: fbdev registered by the helper
596
 */
1179 serge 597
int drm_fb_helper_check_var(struct fb_var_screeninfo *var,
598
			    struct fb_info *info)
599
{
600
	struct drm_fb_helper *fb_helper = info->par;
601
	struct drm_framebuffer *fb = fb_helper->fb;
602
	int depth;
603
 
1963 serge 604
	if (var->pixclock != 0 || in_dbg_master())
1179 serge 605
		return -EINVAL;
606
 
607
	/* Need to resize the fb object !!! */
3031 serge 608
	if (var->bits_per_pixel > fb->bits_per_pixel ||
609
	    var->xres > fb->width || var->yres > fb->height ||
610
	    var->xres_virtual > fb->width || var->yres_virtual > fb->height) {
1404 serge 611
		DRM_DEBUG("fb userspace requested width/height/bpp is greater than current fb "
3031 serge 612
			  "request %dx%d-%d (virtual %dx%d) > %dx%d-%d\n",
613
			  var->xres, var->yres, var->bits_per_pixel,
614
			  var->xres_virtual, var->yres_virtual,
1404 serge 615
			  fb->width, fb->height, fb->bits_per_pixel);
1179 serge 616
		return -EINVAL;
617
	}
618
 
619
	switch (var->bits_per_pixel) {
620
	case 16:
621
		depth = (var->green.length == 6) ? 16 : 15;
622
		break;
623
	case 32:
624
		depth = (var->transp.length > 0) ? 32 : 24;
625
		break;
626
	default:
627
		depth = var->bits_per_pixel;
628
		break;
629
	}
630
 
631
	switch (depth) {
632
	case 8:
633
		var->red.offset = 0;
634
		var->green.offset = 0;
635
		var->blue.offset = 0;
636
		var->red.length = 8;
637
		var->green.length = 8;
638
		var->blue.length = 8;
639
		var->transp.length = 0;
640
		var->transp.offset = 0;
641
		break;
642
	case 15:
643
		var->red.offset = 10;
644
		var->green.offset = 5;
645
		var->blue.offset = 0;
646
		var->red.length = 5;
647
		var->green.length = 5;
648
		var->blue.length = 5;
649
		var->transp.length = 1;
650
		var->transp.offset = 15;
651
		break;
652
	case 16:
653
		var->red.offset = 11;
654
		var->green.offset = 5;
655
		var->blue.offset = 0;
656
		var->red.length = 5;
657
		var->green.length = 6;
658
		var->blue.length = 5;
659
		var->transp.length = 0;
660
		var->transp.offset = 0;
661
		break;
662
	case 24:
663
		var->red.offset = 16;
664
		var->green.offset = 8;
665
		var->blue.offset = 0;
666
		var->red.length = 8;
667
		var->green.length = 8;
668
		var->blue.length = 8;
669
		var->transp.length = 0;
670
		var->transp.offset = 0;
671
		break;
672
	case 32:
673
		var->red.offset = 16;
674
		var->green.offset = 8;
675
		var->blue.offset = 0;
676
		var->red.length = 8;
677
		var->green.length = 8;
678
		var->blue.length = 8;
679
		var->transp.length = 8;
680
		var->transp.offset = 24;
681
		break;
682
	default:
683
		return -EINVAL;
684
	}
685
	return 0;
686
}
687
EXPORT_SYMBOL(drm_fb_helper_check_var);
688
 
3480 Serge 689
/**
690
 * drm_fb_helper_set_par - implementation for ->fb_set_par
691
 * @info: fbdev registered by the helper
692
 *
693
 * This will let fbcon do the mode init and is called at initialization time by
694
 * the fbdev core when registering the driver, and later on through the hotplug
695
 * callback.
696
 */
1179 serge 697
int drm_fb_helper_set_par(struct fb_info *info)
698
{
699
	struct drm_fb_helper *fb_helper = info->par;
700
	struct fb_var_screeninfo *var = &info->var;
701
 
1313 serge 702
	if (var->pixclock != 0) {
1430 serge 703
		DRM_ERROR("PIXEL CLOCK SET\n");
1179 serge 704
		return -EINVAL;
705
	}
706
 
5060 serge 707
	drm_fb_helper_restore_fbdev_mode_unlocked(fb_helper);
1963 serge 708
 
709
	if (fb_helper->delayed_hotplug) {
710
		fb_helper->delayed_hotplug = false;
3480 Serge 711
		drm_fb_helper_hotplug_event(fb_helper);
1963 serge 712
	}
1179 serge 713
	return 0;
714
}
715
EXPORT_SYMBOL(drm_fb_helper_set_par);
716
 
3480 Serge 717
/**
718
 * drm_fb_helper_pan_display - implementation for ->fb_pan_display
719
 * @var: updated screen information
720
 * @info: fbdev registered by the helper
721
 */
1179 serge 722
int drm_fb_helper_pan_display(struct fb_var_screeninfo *var,
723
			      struct fb_info *info)
724
{
725
	struct drm_fb_helper *fb_helper = info->par;
726
	struct drm_device *dev = fb_helper->dev;
727
	struct drm_mode_set *modeset;
728
	int ret = 0;
729
	int i;
730
 
3480 Serge 731
	drm_modeset_lock_all(dev);
732
	if (!drm_fb_helper_is_bound(fb_helper)) {
733
		drm_modeset_unlock_all(dev);
734
		return -EBUSY;
735
	}
736
 
1179 serge 737
		for (i = 0; i < fb_helper->crtc_count; i++) {
738
		modeset = &fb_helper->crtc_info[i].mode_set;
739
 
740
		modeset->x = var->xoffset;
741
		modeset->y = var->yoffset;
742
 
743
		if (modeset->num_connectors) {
3480 Serge 744
			ret = drm_mode_set_config_internal(modeset);
1179 serge 745
			if (!ret) {
746
				info->var.xoffset = var->xoffset;
747
				info->var.yoffset = var->yoffset;
748
			}
749
		}
750
	}
3480 Serge 751
	drm_modeset_unlock_all(dev);
1179 serge 752
	return ret;
753
}
754
EXPORT_SYMBOL(drm_fb_helper_pan_display);
755
 
3480 Serge 756
/*
757
 * Allocates the backing storage and sets up the fbdev info structure through
758
 * the ->fb_probe callback and then registers the fbdev and sets up the panic
759
 * notifier.
760
 */
761
static int drm_fb_helper_single_fb_probe(struct drm_fb_helper *fb_helper,
1963 serge 762
				  int preferred_bpp)
1179 serge 763
{
3480 Serge 764
	int ret = 0;
1179 serge 765
	int crtc_count = 0;
1963 serge 766
	int i;
1179 serge 767
	struct fb_info *info;
1963 serge 768
	struct drm_fb_helper_surface_size sizes;
769
	int gamma_size = 0;
1179 serge 770
 
1963 serge 771
	memset(&sizes, 0, sizeof(struct drm_fb_helper_surface_size));
772
	sizes.surface_depth = 24;
773
	sizes.surface_bpp = 32;
774
	sizes.fb_width = (unsigned)-1;
775
	sizes.fb_height = (unsigned)-1;
1221 serge 776
 
3031 serge 777
	/* if driver picks 8 or 16 by default use that
778
	   for both depth/bpp */
3192 Serge 779
	if (preferred_bpp != sizes.surface_bpp)
3031 serge 780
		sizes.surface_depth = sizes.surface_bpp = preferred_bpp;
3192 Serge 781
 
3031 serge 782
	/* first up get a count of crtcs now in use and new min/maxes width/heights */
783
	for (i = 0; i < fb_helper->connector_count; i++) {
784
		struct drm_fb_helper_connector *fb_helper_conn = fb_helper->connector_info[i];
785
		struct drm_cmdline_mode *cmdline_mode;
786
 
787
		cmdline_mode = &fb_helper_conn->cmdline_mode;
788
 
789
		if (cmdline_mode->bpp_specified) {
790
			switch (cmdline_mode->bpp) {
791
			case 8:
792
				sizes.surface_depth = sizes.surface_bpp = 8;
793
				break;
794
			case 15:
795
				sizes.surface_depth = 15;
796
				sizes.surface_bpp = 16;
797
				break;
798
			case 16:
799
				sizes.surface_depth = sizes.surface_bpp = 16;
800
				break;
801
			case 24:
802
				sizes.surface_depth = sizes.surface_bpp = 24;
803
				break;
804
			case 32:
1963 serge 805
    sizes.surface_depth = 24;
806
    sizes.surface_bpp = 32;
3031 serge 807
				break;
808
			}
809
			break;
810
		}
811
	}
1221 serge 812
 
1963 serge 813
	crtc_count = 0;
814
	for (i = 0; i < fb_helper->crtc_count; i++) {
815
		struct drm_display_mode *desired_mode;
816
		desired_mode = fb_helper->crtc_info[i].desired_mode;
1221 serge 817
 
1963 serge 818
		if (desired_mode) {
819
			if (gamma_size == 0)
820
				gamma_size = fb_helper->crtc_info[i].mode_set.crtc->gamma_size;
821
			if (desired_mode->hdisplay < sizes.fb_width)
822
				sizes.fb_width = desired_mode->hdisplay;
823
			if (desired_mode->vdisplay < sizes.fb_height)
824
				sizes.fb_height = desired_mode->vdisplay;
825
			if (desired_mode->hdisplay > sizes.surface_width)
826
				sizes.surface_width = desired_mode->hdisplay;
827
			if (desired_mode->vdisplay > sizes.surface_height)
828
				sizes.surface_height = desired_mode->vdisplay;
1179 serge 829
			crtc_count++;
4539 Serge 830
       }
1179 serge 831
	}
832
 
1963 serge 833
	if (crtc_count == 0 || sizes.fb_width == -1 || sizes.fb_height == -1) {
1179 serge 834
		/* hmm everyone went away - assume VGA cable just fell out
835
		   and will come back later. */
1963 serge 836
		DRM_INFO("Cannot find any crtc or sizes - going 1024x768\n");
837
		sizes.fb_width = sizes.surface_width = 1024;
838
		sizes.fb_height = sizes.surface_height = 768;
1179 serge 839
	}
840
 
1963 serge 841
	/* push down into drivers */
3480 Serge 842
	ret = (*fb_helper->funcs->fb_probe)(fb_helper, &sizes);
843
	if (ret < 0)
844
		return ret;
1179 serge 845
 
1963 serge 846
	info = fb_helper->fbdev;
1179 serge 847
 
3480 Serge 848
	/*
849
	 * Set the fb pointer - usually drm_setup_crtcs does this for hotplug
850
	 * events, but at init time drm_setup_crtcs needs to be called before
851
	 * the fb is allocated (since we need to figure out the desired size of
852
	 * the fb before we can allocate it ...). Hence we need to fix things up
853
	 * here again.
854
	 */
3192 Serge 855
	for (i = 0; i < fb_helper->crtc_count; i++)
3480 Serge 856
		if (fb_helper->crtc_info[i].mode_set.num_connectors)
1963 serge 857
		fb_helper->crtc_info[i].mode_set.fb = fb_helper->fb;
1179 serge 858
 
3480 Serge 859
 
1313 serge 860
		info->var.pixclock = 0;
1963 serge 861
 
862
        list_add(&fb_helper->kernel_fb_list, &kernel_fb_helper_list);
863
 
1179 serge 864
	return 0;
865
}
866
 
3480 Serge 867
/**
868
 * drm_fb_helper_fill_fix - initializes fixed fbdev information
869
 * @info: fbdev registered by the helper
870
 * @pitch: desired pitch
871
 * @depth: desired depth
872
 *
873
 * Helper to fill in the fixed fbdev information useful for a non-accelerated
874
 * fbdev emulations. Drivers which support acceleration methods which impose
875
 * additional constraints need to set up their own limits.
876
 *
877
 * Drivers should call this (or their equivalent setup code) from their
878
 * ->fb_probe callback.
879
 */
1221 serge 880
void drm_fb_helper_fill_fix(struct fb_info *info, uint32_t pitch,
881
			    uint32_t depth)
1179 serge 882
{
883
	info->fix.type = FB_TYPE_PACKED_PIXELS;
1221 serge 884
	info->fix.visual = depth == 8 ? FB_VISUAL_PSEUDOCOLOR :
1246 serge 885
		FB_VISUAL_TRUECOLOR;
1963 serge 886
	info->fix.mmio_start = 0;
887
	info->fix.mmio_len = 0;
1179 serge 888
	info->fix.type_aux = 0;
889
	info->fix.xpanstep = 1; /* doing it in hw */
890
	info->fix.ypanstep = 1; /* doing it in hw */
891
	info->fix.ywrapstep = 0;
892
	info->fix.accel = FB_ACCEL_NONE;
893
 
894
	info->fix.line_length = pitch;
895
	return;
896
}
897
EXPORT_SYMBOL(drm_fb_helper_fill_fix);
898
 
3480 Serge 899
/**
900
 * drm_fb_helper_fill_var - initalizes variable fbdev information
901
 * @info: fbdev instance to set up
902
 * @fb_helper: fb helper instance to use as template
903
 * @fb_width: desired fb width
904
 * @fb_height: desired fb height
905
 *
906
 * Sets up the variable fbdev metainformation from the given fb helper instance
907
 * and the drm framebuffer allocated in fb_helper->fb.
908
 *
909
 * Drivers should call this (or their equivalent setup code) from their
910
 * ->fb_probe callback after having allocated the fbdev backing
911
 * storage framebuffer.
912
 */
1963 serge 913
void drm_fb_helper_fill_var(struct fb_info *info, struct drm_fb_helper *fb_helper,
1179 serge 914
			    uint32_t fb_width, uint32_t fb_height)
915
{
1963 serge 916
	struct drm_framebuffer *fb = fb_helper->fb;
917
	info->pseudo_palette = fb_helper->pseudo_palette;
1179 serge 918
	info->var.xres_virtual = fb->width;
919
	info->var.yres_virtual = fb->height;
920
	info->var.bits_per_pixel = fb->bits_per_pixel;
1963 serge 921
	info->var.accel_flags = FB_ACCELF_TEXT;
1179 serge 922
	info->var.xoffset = 0;
923
	info->var.yoffset = 0;
924
	info->var.activate = FB_ACTIVATE_NOW;
925
	info->var.height = -1;
926
	info->var.width = -1;
927
 
928
	switch (fb->depth) {
929
	case 8:
930
		info->var.red.offset = 0;
931
		info->var.green.offset = 0;
932
		info->var.blue.offset = 0;
933
		info->var.red.length = 8; /* 8bit DAC */
934
		info->var.green.length = 8;
935
		info->var.blue.length = 8;
936
		info->var.transp.offset = 0;
937
		info->var.transp.length = 0;
938
		break;
939
	case 15:
940
		info->var.red.offset = 10;
941
		info->var.green.offset = 5;
942
		info->var.blue.offset = 0;
943
		info->var.red.length = 5;
944
		info->var.green.length = 5;
945
		info->var.blue.length = 5;
946
		info->var.transp.offset = 15;
947
		info->var.transp.length = 1;
948
		break;
949
	case 16:
950
		info->var.red.offset = 11;
951
		info->var.green.offset = 5;
952
		info->var.blue.offset = 0;
953
		info->var.red.length = 5;
954
		info->var.green.length = 6;
955
		info->var.blue.length = 5;
956
		info->var.transp.offset = 0;
957
		break;
958
	case 24:
959
		info->var.red.offset = 16;
960
		info->var.green.offset = 8;
961
		info->var.blue.offset = 0;
962
		info->var.red.length = 8;
963
		info->var.green.length = 8;
964
		info->var.blue.length = 8;
965
		info->var.transp.offset = 0;
966
		info->var.transp.length = 0;
967
		break;
968
	case 32:
969
		info->var.red.offset = 16;
970
		info->var.green.offset = 8;
971
		info->var.blue.offset = 0;
972
		info->var.red.length = 8;
973
		info->var.green.length = 8;
974
		info->var.blue.length = 8;
975
		info->var.transp.offset = 24;
976
		info->var.transp.length = 8;
977
		break;
978
	default:
979
		break;
980
	}
981
 
982
	info->var.xres = fb_width;
983
	info->var.yres = fb_height;
984
}
985
EXPORT_SYMBOL(drm_fb_helper_fill_var);
1963 serge 986
 
987
static int drm_fb_helper_probe_connector_modes(struct drm_fb_helper *fb_helper,
988
					       uint32_t maxX,
989
					       uint32_t maxY)
990
{
991
	struct drm_connector *connector;
992
	int count = 0;
993
	int i;
994
 
995
	for (i = 0; i < fb_helper->connector_count; i++) {
996
		connector = fb_helper->connector_info[i]->connector;
997
		count += connector->funcs->fill_modes(connector, maxX, maxY);
998
	}
999
 
1000
	return count;
1001
}
1002
 
5060 serge 1003
struct drm_display_mode *drm_has_preferred_mode(struct drm_fb_helper_connector *fb_connector, int width, int height)
1963 serge 1004
{
1005
	struct drm_display_mode *mode;
1006
 
1007
	list_for_each_entry(mode, &fb_connector->connector->modes, head) {
5060 serge 1008
		if (mode->hdisplay > width ||
1009
		    mode->vdisplay > height)
1963 serge 1010
			continue;
1011
		if (mode->type & DRM_MODE_TYPE_PREFERRED)
1012
			return mode;
1013
	}
1014
	return NULL;
1015
}
5060 serge 1016
EXPORT_SYMBOL(drm_has_preferred_mode);
1963 serge 1017
 
1018
static bool drm_has_cmdline_mode(struct drm_fb_helper_connector *fb_connector)
1019
{
1020
	struct drm_cmdline_mode *cmdline_mode;
1021
	cmdline_mode = &fb_connector->cmdline_mode;
1022
	return cmdline_mode->specified;
1023
}
1024
 
5060 serge 1025
struct drm_display_mode *drm_pick_cmdline_mode(struct drm_fb_helper_connector *fb_helper_conn,
3746 Serge 1026
						      int width, int height)
1027
{
1028
	struct drm_cmdline_mode *cmdline_mode;
1029
	struct drm_display_mode *mode = NULL;
5060 serge 1030
	bool prefer_non_interlace;
1963 serge 1031
 
3746 Serge 1032
	return NULL;
1033
 
1034
	cmdline_mode = &fb_helper_conn->cmdline_mode;
1035
	if (cmdline_mode->specified == false)
1036
		return mode;
1037
 
1038
	/* attempt to find a matching mode in the list of modes
1039
	 *  we have gotten so far, if not add a CVT mode that conforms
1040
	 */
1041
	if (cmdline_mode->rb || cmdline_mode->margins)
1042
		goto create_mode;
1043
 
5060 serge 1044
	prefer_non_interlace = !cmdline_mode->interlace;
1045
 again:
3746 Serge 1046
	list_for_each_entry(mode, &fb_helper_conn->connector->modes, head) {
1047
		/* check width/height */
1048
		if (mode->hdisplay != cmdline_mode->xres ||
1049
		    mode->vdisplay != cmdline_mode->yres)
1050
			continue;
1051
 
1052
		if (cmdline_mode->refresh_specified) {
1053
			if (mode->vrefresh != cmdline_mode->refresh)
1054
				continue;
1055
		}
1056
 
1057
		if (cmdline_mode->interlace) {
1058
			if (!(mode->flags & DRM_MODE_FLAG_INTERLACE))
1059
				continue;
5060 serge 1060
		} else if (prefer_non_interlace) {
1061
			if (mode->flags & DRM_MODE_FLAG_INTERLACE)
1062
				continue;
3746 Serge 1063
		}
1064
		return mode;
1065
	}
1066
 
5060 serge 1067
	if (prefer_non_interlace) {
1068
		prefer_non_interlace = false;
1069
		goto again;
1070
	}
1071
 
3746 Serge 1072
create_mode:
1073
	mode = drm_mode_create_from_cmdline_mode(fb_helper_conn->connector->dev,
1074
						 cmdline_mode);
1075
	list_add(&mode->head, &fb_helper_conn->connector->modes);
1076
	return mode;
1077
}
5060 serge 1078
EXPORT_SYMBOL(drm_pick_cmdline_mode);
3746 Serge 1079
 
1963 serge 1080
static bool drm_connector_enabled(struct drm_connector *connector, bool strict)
1081
{
1082
	bool enable;
1083
 
3192 Serge 1084
	if (strict)
1963 serge 1085
		enable = connector->status == connector_status_connected;
3192 Serge 1086
	else
1963 serge 1087
		enable = connector->status != connector_status_disconnected;
3192 Serge 1088
 
1963 serge 1089
	return enable;
1090
}
1091
 
1092
static void drm_enable_connectors(struct drm_fb_helper *fb_helper,
1093
				  bool *enabled)
1094
{
1095
	bool any_enabled = false;
1096
	struct drm_connector *connector;
1097
	int i = 0;
1098
 
1099
	for (i = 0; i < fb_helper->connector_count; i++) {
1100
		connector = fb_helper->connector_info[i]->connector;
1101
		enabled[i] = drm_connector_enabled(connector, true);
1102
		DRM_DEBUG_KMS("connector %d enabled? %s\n", connector->base.id,
1103
			  enabled[i] ? "yes" : "no");
1104
		any_enabled |= enabled[i];
1105
	}
1106
 
1107
	if (any_enabled)
1108
		return;
1109
 
1110
	for (i = 0; i < fb_helper->connector_count; i++) {
1111
		connector = fb_helper->connector_info[i]->connector;
1112
		enabled[i] = drm_connector_enabled(connector, false);
1113
	}
1114
}
1115
 
3746 Serge 1116
static bool drm_target_cloned(struct drm_fb_helper *fb_helper,
1117
			      struct drm_display_mode **modes,
1118
			      bool *enabled, int width, int height)
1119
{
1120
	int count, i, j;
1121
	bool can_clone = false;
1122
	struct drm_fb_helper_connector *fb_helper_conn;
1123
	struct drm_display_mode *dmt_mode, *mode;
1963 serge 1124
 
3746 Serge 1125
	/* only contemplate cloning in the single crtc case */
1126
	if (fb_helper->crtc_count > 1)
1127
		return false;
1128
 
1129
	count = 0;
1130
	for (i = 0; i < fb_helper->connector_count; i++) {
1131
		if (enabled[i])
1132
			count++;
1133
	}
1134
 
1135
	/* only contemplate cloning if more than one connector is enabled */
1136
	if (count <= 1)
1137
		return false;
1138
 
1139
	/* check the command line or if nothing common pick 1024x768 */
1140
	can_clone = true;
1141
	for (i = 0; i < fb_helper->connector_count; i++) {
1142
		if (!enabled[i])
1143
			continue;
1144
		fb_helper_conn = fb_helper->connector_info[i];
1145
		modes[i] = drm_pick_cmdline_mode(fb_helper_conn, width, height);
1146
		if (!modes[i]) {
1147
			can_clone = false;
1148
			break;
1149
		}
1150
		for (j = 0; j < i; j++) {
1151
			if (!enabled[j])
1152
				continue;
1153
			if (!drm_mode_equal(modes[j], modes[i]))
1154
				can_clone = false;
1155
		}
1156
	}
1157
 
1158
	if (can_clone) {
1159
		DRM_DEBUG_KMS("can clone using command line\n");
1160
		return true;
1161
	}
1162
 
1163
	/* try and find a 1024x768 mode on each connector */
1164
	can_clone = true;
1165
	dmt_mode = drm_mode_find_dmt(fb_helper->dev, 1024, 768, 60, false);
1166
 
1167
	for (i = 0; i < fb_helper->connector_count; i++) {
1168
 
1169
		if (!enabled[i])
1170
			continue;
1171
 
1172
		fb_helper_conn = fb_helper->connector_info[i];
1173
		list_for_each_entry(mode, &fb_helper_conn->connector->modes, head) {
1174
			if (drm_mode_equal(mode, dmt_mode))
1175
				modes[i] = mode;
1176
		}
1177
		if (!modes[i])
1178
			can_clone = false;
1179
	}
1180
 
1181
	if (can_clone) {
1182
		DRM_DEBUG_KMS("can clone using 1024x768\n");
1183
		return true;
1184
	}
1185
	DRM_INFO("kms: can't enable cloning when we probably wanted to.\n");
1186
	return false;
1187
}
1188
 
1963 serge 1189
static bool drm_target_preferred(struct drm_fb_helper *fb_helper,
1190
				 struct drm_display_mode **modes,
1191
				 bool *enabled, int width, int height)
1192
{
1193
	struct drm_fb_helper_connector *fb_helper_conn;
1194
	int i;
1195
 
1196
	for (i = 0; i < fb_helper->connector_count; i++) {
1197
		fb_helper_conn = fb_helper->connector_info[i];
1198
 
1199
		if (enabled[i] == false)
1200
			continue;
1201
 
1202
		DRM_DEBUG_KMS("looking for cmdline mode on connector %d\n",
1203
			      fb_helper_conn->connector->base.id);
1204
 
1205
		/* got for command line mode first */
3746 Serge 1206
		modes[i] = drm_pick_cmdline_mode(fb_helper_conn, width, height);
1963 serge 1207
		if (!modes[i]) {
1208
			DRM_DEBUG_KMS("looking for preferred mode on connector %d\n",
1209
				      fb_helper_conn->connector->base.id);
1210
			modes[i] = drm_has_preferred_mode(fb_helper_conn, width, height);
1211
		}
1212
		/* No preferred modes, pick one off the list */
1213
		if (!modes[i] && !list_empty(&fb_helper_conn->connector->modes)) {
1214
			list_for_each_entry(modes[i], &fb_helper_conn->connector->modes, head)
1215
				break;
1216
		}
1217
		DRM_DEBUG_KMS("found mode %s\n", modes[i] ? modes[i]->name :
1218
			  "none");
1219
	}
1220
	return true;
1221
}
1222
 
1223
static int drm_pick_crtcs(struct drm_fb_helper *fb_helper,
1224
			  struct drm_fb_helper_crtc **best_crtcs,
1225
			  struct drm_display_mode **modes,
1226
			  int n, int width, int height)
1227
{
1228
	int c, o;
1229
	struct drm_device *dev = fb_helper->dev;
1230
	struct drm_connector *connector;
1231
	struct drm_connector_helper_funcs *connector_funcs;
1232
	struct drm_encoder *encoder;
1233
	int my_score, best_score, score;
1234
	struct drm_fb_helper_crtc **crtcs, *crtc;
1235
	struct drm_fb_helper_connector *fb_helper_conn;
1236
 
1237
	if (n == fb_helper->connector_count)
1238
		return 0;
1239
 
1240
	fb_helper_conn = fb_helper->connector_info[n];
1241
	connector = fb_helper_conn->connector;
1242
 
1243
	best_crtcs[n] = NULL;
1244
	best_score = drm_pick_crtcs(fb_helper, best_crtcs, modes, n+1, width, height);
1245
	if (modes[n] == NULL)
1246
		return best_score;
1247
 
1248
	crtcs = kzalloc(dev->mode_config.num_connector *
1249
			sizeof(struct drm_fb_helper_crtc *), GFP_KERNEL);
1250
	if (!crtcs)
1251
		return best_score;
1252
 
1253
	my_score = 1;
1254
	if (connector->status == connector_status_connected)
1255
		my_score++;
1256
	if (drm_has_cmdline_mode(fb_helper_conn))
1257
		my_score++;
1258
	if (drm_has_preferred_mode(fb_helper_conn, width, height))
1259
		my_score++;
1260
 
1261
	connector_funcs = connector->helper_private;
1262
	encoder = connector_funcs->best_encoder(connector);
1263
	if (!encoder)
1264
		goto out;
1265
 
1266
	/* select a crtc for this connector and then attempt to configure
1267
	   remaining connectors */
1268
	for (c = 0; c < fb_helper->crtc_count; c++) {
1269
		crtc = &fb_helper->crtc_info[c];
1270
 
3192 Serge 1271
		if ((encoder->possible_crtcs & (1 << c)) == 0)
1963 serge 1272
			continue;
1273
 
1274
		for (o = 0; o < n; o++)
1275
			if (best_crtcs[o] == crtc)
1276
				break;
1277
 
1278
		if (o < n) {
1279
			/* ignore cloning unless only a single crtc */
1280
			if (fb_helper->crtc_count > 1)
1281
				continue;
1282
 
1283
			if (!drm_mode_equal(modes[o], modes[n]))
1284
				continue;
1285
		}
1286
 
1287
		crtcs[n] = crtc;
1288
		memcpy(crtcs, best_crtcs, n * sizeof(struct drm_fb_helper_crtc *));
1289
		score = my_score + drm_pick_crtcs(fb_helper, crtcs, modes, n + 1,
1290
						  width, height);
1291
		if (score > best_score) {
1292
			best_score = score;
1293
			memcpy(best_crtcs, crtcs,
1294
			       dev->mode_config.num_connector *
1295
			       sizeof(struct drm_fb_helper_crtc *));
1296
		}
1297
	}
1298
out:
1299
	kfree(crtcs);
1300
	return best_score;
1301
}
1302
 
1303
static void drm_setup_crtcs(struct drm_fb_helper *fb_helper)
1304
{
1305
	struct drm_device *dev = fb_helper->dev;
1306
	struct drm_fb_helper_crtc **crtcs;
1307
	struct drm_display_mode **modes;
1308
	struct drm_mode_set *modeset;
1309
	bool *enabled;
1310
	int width, height;
3746 Serge 1311
	int i;
1963 serge 1312
 
1313
	DRM_DEBUG_KMS("\n");
1314
 
1315
	width = dev->mode_config.max_width;
1316
	height = dev->mode_config.max_height;
1317
 
1318
	crtcs = kcalloc(dev->mode_config.num_connector,
1319
			sizeof(struct drm_fb_helper_crtc *), GFP_KERNEL);
1320
	modes = kcalloc(dev->mode_config.num_connector,
1321
			sizeof(struct drm_display_mode *), GFP_KERNEL);
1322
	enabled = kcalloc(dev->mode_config.num_connector,
1323
			  sizeof(bool), GFP_KERNEL);
3192 Serge 1324
	if (!crtcs || !modes || !enabled) {
1325
		DRM_ERROR("Memory allocation failed\n");
1326
		goto out;
1327
	}
1963 serge 1328
 
3192 Serge 1329
 
1963 serge 1330
	drm_enable_connectors(fb_helper, enabled);
1331
 
3746 Serge 1332
	if (!(fb_helper->funcs->initial_config &&
1333
	      fb_helper->funcs->initial_config(fb_helper, crtcs, modes,
1334
					       enabled, width, height))) {
1335
		memset(modes, 0, dev->mode_config.num_connector*sizeof(modes[0]));
1336
		memset(crtcs, 0, dev->mode_config.num_connector*sizeof(crtcs[0]));
1963 serge 1337
 
3746 Serge 1338
		if (!drm_target_cloned(fb_helper,
1339
				       modes, enabled, width, height) &&
1340
		    !drm_target_preferred(fb_helper,
1341
					  modes, enabled, width, height))
1963 serge 1342
			DRM_ERROR("Unable to find initial modes\n");
1343
 
3746 Serge 1344
		DRM_DEBUG_KMS("picking CRTCs for %dx%d config\n",
1345
			      width, height);
1963 serge 1346
 
1347
	drm_pick_crtcs(fb_helper, crtcs, modes, 0, width, height);
3746 Serge 1348
	}
1963 serge 1349
 
1350
	/* need to set the modesets up here for use later */
1351
	/* fill out the connector<->crtc mappings into the modesets */
1352
	for (i = 0; i < fb_helper->crtc_count; i++) {
1353
		modeset = &fb_helper->crtc_info[i].mode_set;
1354
		modeset->num_connectors = 0;
3480 Serge 1355
		modeset->fb = NULL;
1963 serge 1356
	}
1357
 
1358
	for (i = 0; i < fb_helper->connector_count; i++) {
1359
		struct drm_display_mode *mode = modes[i];
1360
		struct drm_fb_helper_crtc *fb_crtc = crtcs[i];
1361
		modeset = &fb_crtc->mode_set;
1362
 
1363
		if (mode && fb_crtc) {
1364
			DRM_DEBUG_KMS("desired mode %s set on crtc %d\n",
1365
				      mode->name, fb_crtc->mode_set.crtc->base.id);
1366
			fb_crtc->desired_mode = mode;
1367
			if (modeset->mode)
1368
				drm_mode_destroy(dev, modeset->mode);
1369
			modeset->mode = drm_mode_duplicate(dev,
1370
							   fb_crtc->desired_mode);
1371
			modeset->connectors[modeset->num_connectors++] = fb_helper->connector_info[i]->connector;
3480 Serge 1372
			modeset->fb = fb_helper->fb;
1963 serge 1373
		}
1374
	}
1375
 
3480 Serge 1376
	/* Clear out any old modes if there are no more connected outputs. */
1377
	for (i = 0; i < fb_helper->crtc_count; i++) {
1378
		modeset = &fb_helper->crtc_info[i].mode_set;
1379
		if (modeset->num_connectors == 0) {
1380
			BUG_ON(modeset->fb);
1381
			BUG_ON(modeset->num_connectors);
1382
			if (modeset->mode)
1383
				drm_mode_destroy(dev, modeset->mode);
1384
			modeset->mode = NULL;
1385
		}
1386
	}
3192 Serge 1387
out:
1963 serge 1388
	kfree(crtcs);
1389
	kfree(modes);
1390
	kfree(enabled);
1391
}
1392
 
1393
/**
3480 Serge 1394
 * drm_fb_helper_initial_config - setup a sane initial connector configuration
3192 Serge 1395
 * @fb_helper: fb_helper device struct
1396
 * @bpp_sel: bpp value to use for the framebuffer configuration
1963 serge 1397
 *
3192 Serge 1398
 * Scans the CRTCs and connectors and tries to put together an initial setup.
1963 serge 1399
 * At the moment, this is a cloned configuration across all heads with
1400
 * a new framebuffer object as the backing store.
1401
 *
3480 Serge 1402
 * Note that this also registers the fbdev and so allows userspace to call into
1403
 * the driver through the fbdev interfaces.
1404
 *
1405
 * This function will call down into the ->fb_probe callback to let
1406
 * the driver allocate and initialize the fbdev info structure and the drm
1407
 * framebuffer used to back the fbdev. drm_fb_helper_fill_var() and
1408
 * drm_fb_helper_fill_fix() are provided as helpers to setup simple default
1409
 * values for the fbdev info structure.
1410
 *
1963 serge 1411
 * RETURNS:
1412
 * Zero if everything went ok, nonzero otherwise.
1413
 */
1414
bool drm_fb_helper_initial_config(struct drm_fb_helper *fb_helper, int bpp_sel)
1415
{
1416
	struct drm_device *dev = fb_helper->dev;
1417
	int count = 0;
1418
 
1419
//   drm_fb_helper_parse_command_line(fb_helper);
1420
 
5060 serge 1421
	mutex_lock(&dev->mode_config.mutex);
1963 serge 1422
	count = drm_fb_helper_probe_connector_modes(fb_helper,
1423
						    dev->mode_config.max_width,
1424
						    dev->mode_config.max_height);
5060 serge 1425
	mutex_unlock(&dev->mode_config.mutex);
1963 serge 1426
	/*
1427
	 * we shouldn't end up with no modes here.
1428
	 */
3192 Serge 1429
	if (count == 0)
1430
		dev_info(fb_helper->dev->dev, "No connectors reported connected with modes\n");
1431
 
1432
	drm_setup_crtcs(fb_helper);
1433
 
3243 Serge 1434
	return drm_fb_helper_single_fb_probe(fb_helper, bpp_sel);
3192 Serge 1435
}
1436
EXPORT_SYMBOL(drm_fb_helper_initial_config);
1437
 
1438
/**
1439
 * drm_fb_helper_hotplug_event - respond to a hotplug notification by
1440
 *                               probing all the outputs attached to the fb
1441
 * @fb_helper: the drm_fb_helper
1442
 *
1443
 * Scan the connectors attached to the fb_helper and try to put together a
1444
 * setup after *notification of a change in output configuration.
1445
 *
3480 Serge 1446
 * Called at runtime, takes the mode config locks to be able to check/change the
1447
 * modeset configuration. Must be run from process context (which usually means
1448
 * either the output polling work or a work item launched from the driver's
1449
 * hotplug interrupt).
1450
 *
5060 serge 1451
 * Note that drivers may call this even before calling
1452
 * drm_fb_helper_initial_config but only aftert drm_fb_helper_init. This allows
1453
 * for a race-free fbcon setup and will make sure that the fbdev emulation will
1454
 * not miss any hotplug events.
3480 Serge 1455
 *
3192 Serge 1456
 * RETURNS:
1457
 * 0 on success and a non-zero error code otherwise.
1458
 */
1459
int drm_fb_helper_hotplug_event(struct drm_fb_helper *fb_helper)
1460
{
1461
	struct drm_device *dev = fb_helper->dev;
4560 Serge 1462
	u32 max_width, max_height;
3192 Serge 1463
 
3480 Serge 1464
	mutex_lock(&fb_helper->dev->mode_config.mutex);
5060 serge 1465
	if (!fb_helper->fb || !drm_fb_helper_is_bound(fb_helper)) {
3192 Serge 1466
		fb_helper->delayed_hotplug = true;
3480 Serge 1467
		mutex_unlock(&fb_helper->dev->mode_config.mutex);
3192 Serge 1468
		return 0;
1469
	}
1470
	DRM_DEBUG_KMS("\n");
1471
 
1472
	max_width = fb_helper->fb->width;
1473
	max_height = fb_helper->fb->height;
1474
 
4560 Serge 1475
	drm_fb_helper_probe_connector_modes(fb_helper, max_width, max_height);
3480 Serge 1476
	mutex_unlock(&fb_helper->dev->mode_config.mutex);
1477
 
1478
	drm_modeset_lock_all(dev);
1963 serge 1479
	drm_setup_crtcs(fb_helper);
3480 Serge 1480
	drm_modeset_unlock_all(dev);
1481
	drm_fb_helper_set_par(fb_helper->fbdev);
1963 serge 1482
 
3480 Serge 1483
	return 0;
1963 serge 1484
}
3192 Serge 1485
EXPORT_SYMBOL(drm_fb_helper_hotplug_event);
1486
 
4560 Serge 1487
/* The Kconfig DRM_KMS_HELPER selects FRAMEBUFFER_CONSOLE (if !EXPERT)
1488
 * but the module doesn't depend on any fb console symbols.  At least
1489
 * attempt to load fbcon to avoid leaving the system without a usable console.
1490
 */
1491
#if defined(CONFIG_FRAMEBUFFER_CONSOLE_MODULE) && !defined(CONFIG_EXPERT)
1492
static int __init drm_fb_helper_modinit(void)
1493
{
1494
	const char *name = "fbcon";
1495
	struct module *fbcon;
3192 Serge 1496
 
4560 Serge 1497
	mutex_lock(&module_mutex);
1498
	fbcon = find_module(name);
1499
	mutex_unlock(&module_mutex);
3192 Serge 1500
 
4560 Serge 1501
	if (!fbcon)
1502
		request_module_nowait(name);
1503
	return 0;
1504
}
1505
 
1506
module_init(drm_fb_helper_modinit);
1507
#endif