summaryrefslogtreecommitdiff
path: root/drivers/gpu/drm/i915/display/intel_panel.c
blob: a0c8e43db5ebbea7d93d89dd37aa9ac6c9ece989 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
/*
 * Copyright © 2006-2010 Intel Corporation
 * Copyright (c) 2006 Dave Airlie <airlied@linux.ie>
 *
 * Permission is hereby granted, free of charge, to any person obtaining a
 * copy of this software and associated documentation files (the "Software"),
 * to deal in the Software without restriction, including without limitation
 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
 * and/or sell copies of the Software, and to permit persons to whom the
 * Software is furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice (including the next
 * paragraph) shall be included in all copies or substantial portions of the
 * Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
 * DEALINGS IN THE SOFTWARE.
 *
 * Authors:
 *	Eric Anholt <eric@anholt.net>
 *      Dave Airlie <airlied@linux.ie>
 *      Jesse Barnes <jesse.barnes@intel.com>
 *      Chris Wilson <chris@chris-wilson.co.uk>
 */

#include <linux/kernel.h>
#include <linux/pwm.h>

#include "intel_backlight.h"
#include "intel_connector.h"
#include "intel_de.h"
#include "intel_display_types.h"
#include "intel_panel.h"

bool intel_panel_use_ssc(struct drm_i915_private *i915)
{
	if (i915->params.panel_use_ssc >= 0)
		return i915->params.panel_use_ssc != 0;
	return i915->vbt.lvds_use_ssc
		&& !(i915->quirks & QUIRK_LVDS_SSC_DISABLE);
}

int intel_panel_compute_config(struct intel_connector *connector,
			       struct drm_display_mode *adjusted_mode)
{
	const struct drm_display_mode *fixed_mode = connector->panel.fixed_mode;

	if (!fixed_mode)
		return 0;

	/*
	 * We don't want to lie too much to the user about the refresh
	 * rate they're going to get. But we have to allow a bit of latitude
	 * for Xorg since it likes to automagically cook up modes with slightly
	 * off refresh rates.
	 */
	if (abs(drm_mode_vrefresh(adjusted_mode) - drm_mode_vrefresh(fixed_mode)) > 1) {
		drm_dbg_kms(connector->base.dev,
			    "[CONNECTOR:%d:%s] Requested mode vrefresh (%d Hz) does not match fixed mode vrefresh (%d Hz)\n",
			    connector->base.base.id, connector->base.name,
			    drm_mode_vrefresh(adjusted_mode), drm_mode_vrefresh(fixed_mode));

		return -EINVAL;
	}

	drm_mode_copy(adjusted_mode, fixed_mode);

	drm_mode_set_crtcinfo(adjusted_mode, 0);

	return 0;
}

static bool is_downclock_mode(const struct drm_display_mode *downclock_mode,
			      const struct drm_display_mode *fixed_mode)
{
	return drm_mode_match(downclock_mode, fixed_mode,
			      DRM_MODE_MATCH_TIMINGS |
			      DRM_MODE_MATCH_FLAGS |
			      DRM_MODE_MATCH_3D_FLAGS) &&
		downclock_mode->clock < fixed_mode->clock;
}

struct drm_display_mode *
intel_panel_edid_downclock_mode(struct intel_connector *connector,
				const struct drm_display_mode *fixed_mode)
{
	struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
	const struct drm_display_mode *scan, *best_mode = NULL;
	struct drm_display_mode *downclock_mode;
	int best_clock = fixed_mode->clock;

	list_for_each_entry(scan, &connector->base.probed_modes, head) {
		/*
		 * If one mode has the same resolution with the fixed_panel
		 * mode while they have the different refresh rate, it means
		 * that the reduced downclock is found. In such
		 * case we can set the different FPx0/1 to dynamically select
		 * between low and high frequency.
		 */
		if (is_downclock_mode(scan, fixed_mode) &&
		    scan->clock < best_clock) {
			/*
			 * The downclock is already found. But we
			 * expect to find the lower downclock.
			 */
			best_clock = scan->clock;
			best_mode = scan;
		}
	}

	if (!best_mode)
		return NULL;

	downclock_mode = drm_mode_duplicate(&dev_priv->drm, best_mode);
	if (!downclock_mode)
		return NULL;

	drm_dbg_kms(&dev_priv->drm,
		    "[CONNECTOR:%d:%s] using downclock mode from EDID: ",
		    connector->base.base.id, connector->base.name);
	drm_mode_debug_printmodeline(downclock_mode);

	return downclock_mode;
}

struct drm_display_mode *
intel_panel_edid_fixed_mode(struct intel_connector *connector)
{
	struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
	const struct drm_display_mode *scan;
	struct drm_display_mode *fixed_mode;

	if (list_empty(&connector->base.probed_modes))
		return NULL;

	/* prefer fixed mode from EDID if available */
	list_for_each_entry(scan, &connector->base.probed_modes, head) {
		if ((scan->type & DRM_MODE_TYPE_PREFERRED) == 0)
			continue;

		fixed_mode = drm_mode_duplicate(&dev_priv->drm, scan);
		if (!fixed_mode)
			return NULL;

		drm_dbg_kms(&dev_priv->drm,
			    "[CONNECTOR:%d:%s] using preferred mode from EDID: ",
			    connector->base.base.id, connector->base.name);
		drm_mode_debug_printmodeline(fixed_mode);

		return fixed_mode;
	}

	scan = list_first_entry(&connector->base.probed_modes,
				typeof(*scan), head);

	fixed_mode = drm_mode_duplicate(&dev_priv->drm, scan);
	if (!fixed_mode)
		return NULL;

	fixed_mode->type |= DRM_MODE_TYPE_PREFERRED;

	drm_dbg_kms(&dev_priv->drm,
		    "[CONNECTOR:%d:%s] using first mode from EDID: ",
		    connector->base.base.id, connector->base.name);
	drm_mode_debug_printmodeline(fixed_mode);

	return fixed_mode;
}

struct drm_display_mode *
intel_panel_vbt_fixed_mode(struct intel_connector *connector)
{
	struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
	struct drm_display_info *info = &connector->base.display_info;
	struct drm_display_mode *fixed_mode;

	if (!dev_priv->vbt.lfp_lvds_vbt_mode)
		return NULL;

	fixed_mode = drm_mode_duplicate(&dev_priv->drm,
					dev_priv->vbt.lfp_lvds_vbt_mode);
	if (!fixed_mode)
		return NULL;

	fixed_mode->type |= DRM_MODE_TYPE_PREFERRED;

	drm_dbg_kms(&dev_priv->drm, "[CONNECTOR:%d:%s] using mode from VBT: ",
		    connector->base.base.id, connector->base.name);
	drm_mode_debug_printmodeline(fixed_mode);

	info->width_mm = fixed_mode->width_mm;
	info->height_mm = fixed_mode->height_mm;

	return fixed_mode;
}

/* adjusted_mode has been preset to be the panel's fixed mode */
static int pch_panel_fitting(struct intel_crtc_state *crtc_state,
			     const struct drm_connector_state *conn_state)
{
	const struct drm_display_mode *adjusted_mode =
		&crtc_state->hw.adjusted_mode;
	int x, y, width, height;

	/* Native modes don't need fitting */
	if (adjusted_mode->crtc_hdisplay == crtc_state->pipe_src_w &&
	    adjusted_mode->crtc_vdisplay == crtc_state->pipe_src_h &&
	    crtc_state->output_format != INTEL_OUTPUT_FORMAT_YCBCR420)
		return 0;

	switch (conn_state->scaling_mode) {
	case DRM_MODE_SCALE_CENTER:
		width = crtc_state->pipe_src_w;
		height = crtc_state->pipe_src_h;
		x = (adjusted_mode->crtc_hdisplay - width + 1)/2;
		y = (adjusted_mode->crtc_vdisplay - height + 1)/2;
		break;

	case DRM_MODE_SCALE_ASPECT:
		/* Scale but preserve the aspect ratio */
		{
			u32 scaled_width = adjusted_mode->crtc_hdisplay
				* crtc_state->pipe_src_h;
			u32 scaled_height = crtc_state->pipe_src_w
				* adjusted_mode->crtc_vdisplay;
			if (scaled_width > scaled_height) { /* pillar */
				width = scaled_height / crtc_state->pipe_src_h;
				if (width & 1)
					width++;
				x = (adjusted_mode->crtc_hdisplay - width + 1) / 2;
				y = 0;
				height = adjusted_mode->crtc_vdisplay;
			} else if (scaled_width < scaled_height) { /* letter */
				height = scaled_width / crtc_state->pipe_src_w;
				if (height & 1)
				    height++;
				y = (adjusted_mode->crtc_vdisplay - height + 1) / 2;
				x = 0;
				width = adjusted_mode->crtc_hdisplay;
			} else {
				x = y = 0;
				width = adjusted_mode->crtc_hdisplay;
				height = adjusted_mode->crtc_vdisplay;
			}
		}
		break;

	case DRM_MODE_SCALE_NONE:
		WARN_ON(adjusted_mode->crtc_hdisplay != crtc_state->pipe_src_w);
		WARN_ON(adjusted_mode->crtc_vdisplay != crtc_state->pipe_src_h);
		fallthrough;
	case DRM_MODE_SCALE_FULLSCREEN:
		x = y = 0;
		width = adjusted_mode->crtc_hdisplay;
		height = adjusted_mode->crtc_vdisplay;
		break;

	default:
		MISSING_CASE(conn_state->scaling_mode);
		return -EINVAL;
	}

	drm_rect_init(&crtc_state->pch_pfit.dst,
		      x, y, width, height);
	crtc_state->pch_pfit.enabled = true;

	return 0;
}

static void
centre_horizontally(struct drm_display_mode *adjusted_mode,
		    int width)
{
	u32 border, sync_pos, blank_width, sync_width;

	/* keep the hsync and hblank widths constant */
	sync_width = adjusted_mode->crtc_hsync_end - adjusted_mode->crtc_hsync_start;
	blank_width = adjusted_mode->crtc_hblank_end - adjusted_mode->crtc_hblank_start;
	sync_pos = (blank_width - sync_width + 1) / 2;

	border = (adjusted_mode->crtc_hdisplay - width + 1) / 2;
	border += border & 1; /* make the border even */

	adjusted_mode->crtc_hdisplay = width;
	adjusted_mode->crtc_hblank_start = width + border;
	adjusted_mode->crtc_hblank_end = adjusted_mode->crtc_hblank_start + blank_width;

	adjusted_mode->crtc_hsync_start = adjusted_mode->crtc_hblank_start + sync_pos;
	adjusted_mode->crtc_hsync_end = adjusted_mode->crtc_hsync_start + sync_width;
}

static void
centre_vertically(struct drm_display_mode *adjusted_mode,
		  int height)
{
	u32 border, sync_pos, blank_width, sync_width;

	/* keep the vsync and vblank widths constant */
	sync_width = adjusted_mode->crtc_vsync_end - adjusted_mode->crtc_vsync_start;
	blank_width = adjusted_mode->crtc_vblank_end - adjusted_mode->crtc_vblank_start;
	sync_pos = (blank_width - sync_width + 1) / 2;

	border = (adjusted_mode->crtc_vdisplay - height + 1) / 2;

	adjusted_mode->crtc_vdisplay = height;
	adjusted_mode->crtc_vblank_start = height + border;
	adjusted_mode->crtc_vblank_end = adjusted_mode->crtc_vblank_start + blank_width;

	adjusted_mode->crtc_vsync_start = adjusted_mode->crtc_vblank_start + sync_pos;
	adjusted_mode->crtc_vsync_end = adjusted_mode->crtc_vsync_start + sync_width;
}

static u32 panel_fitter_scaling(u32 source, u32 target)
{
	/*
	 * Floating point operation is not supported. So the FACTOR
	 * is defined, which can avoid the floating point computation
	 * when calculating the panel ratio.
	 */
#define ACCURACY 12
#define FACTOR (1 << ACCURACY)
	u32 ratio = source * FACTOR / target;
	return (FACTOR * ratio + FACTOR/2) / FACTOR;
}

static void i965_scale_aspect(struct intel_crtc_state *crtc_state,
			      u32 *pfit_control)
{
	const struct drm_display_mode *adjusted_mode =
		&crtc_state->hw.adjusted_mode;
	u32 scaled_width = adjusted_mode->crtc_hdisplay *
		crtc_state->pipe_src_h;
	u32 scaled_height = crtc_state->pipe_src_w *
		adjusted_mode->crtc_vdisplay;

	/* 965+ is easy, it does everything in hw */
	if (scaled_width > scaled_height)
		*pfit_control |= PFIT_ENABLE |
			PFIT_SCALING_PILLAR;
	else if (scaled_width < scaled_height)
		*pfit_control |= PFIT_ENABLE |
			PFIT_SCALING_LETTER;
	else if (adjusted_mode->crtc_hdisplay != crtc_state->pipe_src_w)
		*pfit_control |= PFIT_ENABLE | PFIT_SCALING_AUTO;
}

static void i9xx_scale_aspect(struct intel_crtc_state *crtc_state,
			      u32 *pfit_control, u32 *pfit_pgm_ratios,
			      u32 *border)
{
	struct drm_display_mode *adjusted_mode = &crtc_state->hw.adjusted_mode;
	u32 scaled_width = adjusted_mode->crtc_hdisplay *
		crtc_state->pipe_src_h;
	u32 scaled_height = crtc_state->pipe_src_w *
		adjusted_mode->crtc_vdisplay;
	u32 bits;

	/*
	 * For earlier chips we have to calculate the scaling
	 * ratio by hand and program it into the
	 * PFIT_PGM_RATIO register
	 */
	if (scaled_width > scaled_height) { /* pillar */
		centre_horizontally(adjusted_mode,
				    scaled_height /
				    crtc_state->pipe_src_h);

		*border = LVDS_BORDER_ENABLE;
		if (crtc_state->pipe_src_h != adjusted_mode->crtc_vdisplay) {
			bits = panel_fitter_scaling(crtc_state->pipe_src_h,
						    adjusted_mode->crtc_vdisplay);

			*pfit_pgm_ratios |= (bits << PFIT_HORIZ_SCALE_SHIFT |
					     bits << PFIT_VERT_SCALE_SHIFT);
			*pfit_control |= (PFIT_ENABLE |
					  VERT_INTERP_BILINEAR |
					  HORIZ_INTERP_BILINEAR);
		}
	} else if (scaled_width < scaled_height) { /* letter */
		centre_vertically(adjusted_mode,
				  scaled_width /
				  crtc_state->pipe_src_w);

		*border = LVDS_BORDER_ENABLE;
		if (crtc_state->pipe_src_w != adjusted_mode->crtc_hdisplay) {
			bits = panel_fitter_scaling(crtc_state->pipe_src_w,
						    adjusted_mode->crtc_hdisplay);

			*pfit_pgm_ratios |= (bits << PFIT_HORIZ_SCALE_SHIFT |
					     bits << PFIT_VERT_SCALE_SHIFT);
			*pfit_control |= (PFIT_ENABLE |
					  VERT_INTERP_BILINEAR |
					  HORIZ_INTERP_BILINEAR);
		}
	} else {
		/* Aspects match, Let hw scale both directions */
		*pfit_control |= (PFIT_ENABLE |
				  VERT_AUTO_SCALE | HORIZ_AUTO_SCALE |
				  VERT_INTERP_BILINEAR |
				  HORIZ_INTERP_BILINEAR);
	}
}

static int gmch_panel_fitting(struct intel_crtc_state *crtc_state,
			      const struct drm_connector_state *conn_state)
{
	struct intel_crtc *crtc = to_intel_crtc(crtc_state->uapi.crtc);
	struct drm_i915_private *dev_priv = to_i915(crtc->base.dev);
	u32 pfit_control = 0, pfit_pgm_ratios = 0, border = 0;
	struct drm_display_mode *adjusted_mode = &crtc_state->hw.adjusted_mode;

	/* Native modes don't need fitting */
	if (adjusted_mode->crtc_hdisplay == crtc_state->pipe_src_w &&
	    adjusted_mode->crtc_vdisplay == crtc_state->pipe_src_h)
		goto out;

	switch (conn_state->scaling_mode) {
	case DRM_MODE_SCALE_CENTER:
		/*
		 * For centered modes, we have to calculate border widths &
		 * heights and modify the values programmed into the CRTC.
		 */
		centre_horizontally(adjusted_mode, crtc_state->pipe_src_w);
		centre_vertically(adjusted_mode, crtc_state->pipe_src_h);
		border = LVDS_BORDER_ENABLE;
		break;
	case DRM_MODE_SCALE_ASPECT:
		/* Scale but preserve the aspect ratio */
		if (DISPLAY_VER(dev_priv) >= 4)
			i965_scale_aspect(crtc_state, &pfit_control);
		else
			i9xx_scale_aspect(crtc_state, &pfit_control,
					  &pfit_pgm_ratios, &border);
		break;
	case DRM_MODE_SCALE_FULLSCREEN:
		/*
		 * Full scaling, even if it changes the aspect ratio.
		 * Fortunately this is all done for us in hw.
		 */
		if (crtc_state->pipe_src_h != adjusted_mode->crtc_vdisplay ||
		    crtc_state->pipe_src_w != adjusted_mode->crtc_hdisplay) {
			pfit_control |= PFIT_ENABLE;
			if (DISPLAY_VER(dev_priv) >= 4)
				pfit_control |= PFIT_SCALING_AUTO;
			else
				pfit_control |= (VERT_AUTO_SCALE |
						 VERT_INTERP_BILINEAR |
						 HORIZ_AUTO_SCALE |
						 HORIZ_INTERP_BILINEAR);
		}
		break;
	default:
		MISSING_CASE(conn_state->scaling_mode);
		return -EINVAL;
	}

	/* 965+ wants fuzzy fitting */
	/* FIXME: handle multiple panels by failing gracefully */
	if (DISPLAY_VER(dev_priv) >= 4)
		pfit_control |= PFIT_PIPE(crtc->pipe) | PFIT_FILTER_FUZZY;

out:
	if ((pfit_control & PFIT_ENABLE) == 0) {
		pfit_control = 0;
		pfit_pgm_ratios = 0;
	}

	/* Make sure pre-965 set dither correctly for 18bpp panels. */
	if (DISPLAY_VER(dev_priv) < 4 && crtc_state->pipe_bpp == 18)
		pfit_control |= PANEL_8TO6_DITHER_ENABLE;

	crtc_state->gmch_pfit.control = pfit_control;
	crtc_state->gmch_pfit.pgm_ratios = pfit_pgm_ratios;
	crtc_state->gmch_pfit.lvds_border_bits = border;

	return 0;
}

int intel_panel_fitting(struct intel_crtc_state *crtc_state,
			const struct drm_connector_state *conn_state)
{
	struct intel_crtc *crtc = to_intel_crtc(crtc_state->uapi.crtc);
	struct drm_i915_private *i915 = to_i915(crtc->base.dev);

	if (HAS_GMCH(i915))
		return gmch_panel_fitting(crtc_state, conn_state);
	else
		return pch_panel_fitting(crtc_state, conn_state);
}

enum drm_connector_status
intel_panel_detect(struct drm_connector *connector, bool force)
{
	struct drm_i915_private *i915 = to_i915(connector->dev);

	if (!INTEL_DISPLAY_ENABLED(i915))
		return connector_status_disconnected;

	return connector_status_connected;
}

enum drm_mode_status
intel_panel_mode_valid(struct intel_connector *connector,
		       const struct drm_display_mode *mode)
{
	const struct drm_display_mode *fixed_mode = connector->panel.fixed_mode;

	if (!fixed_mode)
		return MODE_OK;

	if (mode->hdisplay != fixed_mode->hdisplay)
		return MODE_PANEL;

	if (mode->vdisplay != fixed_mode->vdisplay)
		return MODE_PANEL;

	if (drm_mode_vrefresh(mode) != drm_mode_vrefresh(fixed_mode))
		return MODE_PANEL;

	return MODE_OK;
}

int intel_panel_init(struct intel_panel *panel,
		     struct drm_display_mode *fixed_mode,
		     struct drm_display_mode *downclock_mode)
{
	intel_backlight_init_funcs(panel);

	panel->fixed_mode = fixed_mode;
	panel->downclock_mode = downclock_mode;

	return 0;
}

void intel_panel_fini(struct intel_panel *panel)
{
	struct intel_connector *intel_connector =
		container_of(panel, struct intel_connector, panel);

	intel_backlight_destroy(panel);

	if (panel->fixed_mode)
		drm_mode_destroy(intel_connector->base.dev, panel->fixed_mode);

	if (panel->downclock_mode)
		drm_mode_destroy(intel_connector->base.dev,
				panel->downclock_mode);
}