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1/*
2 * Copyright © 2006-2007 Intel Corporation
3 *
4 * Permission is hereby granted, free of charge, to any person obtaining a
5 * copy of this software and associated documentation files (the "Software"),
6 * to deal in the Software without restriction, including without limitation
7 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
8 * and/or sell copies of the Software, and to permit persons to whom the
9 * Software is furnished to do so, subject to the following conditions:
10 *
11 * The above copyright notice and this permission notice (including the next
12 * paragraph) shall be included in all copies or substantial portions of the
13 * Software.
14 *
15 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
16 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
17 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
18 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
19 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
20 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
21 * DEALINGS IN THE SOFTWARE.
22 *
23 * Authors:
24 * Eric Anholt <eric@anholt.net>
25 */
26
27#include <linux/dmi.h>
28#include <linux/i2c.h>
29#include <linux/slab.h>
30
31#include <drm/drm_atomic_helper.h>
32#include <drm/drm_crtc.h>
33#include <drm/drm_edid.h>
34#include <drm/drm_probe_helper.h>
35
36#include "i915_drv.h"
37#include "intel_connector.h"
38#include "intel_crt.h"
39#include "intel_crtc.h"
40#include "intel_ddi.h"
41#include "intel_de.h"
42#include "intel_display_types.h"
43#include "intel_fdi.h"
44#include "intel_fifo_underrun.h"
45#include "intel_gmbus.h"
46#include "intel_hotplug.h"
47
48/* Here's the desired hotplug mode */
49#define ADPA_HOTPLUG_BITS (ADPA_CRT_HOTPLUG_PERIOD_128 | \
50 ADPA_CRT_HOTPLUG_WARMUP_10MS | \
51 ADPA_CRT_HOTPLUG_SAMPLE_4S | \
52 ADPA_CRT_HOTPLUG_VOLTAGE_50 | \
53 ADPA_CRT_HOTPLUG_VOLREF_325MV | \
54 ADPA_CRT_HOTPLUG_ENABLE)
55
56struct intel_crt {
57 struct intel_encoder base;
58 /* DPMS state is stored in the connector, which we need in the
59 * encoder's enable/disable callbacks */
60 struct intel_connector *connector;
61 bool force_hotplug_required;
62 i915_reg_t adpa_reg;
63};
64
65static struct intel_crt *intel_encoder_to_crt(struct intel_encoder *encoder)
66{
67 return container_of(encoder, struct intel_crt, base);
68}
69
70static struct intel_crt *intel_attached_crt(struct intel_connector *connector)
71{
72 return intel_encoder_to_crt(intel_attached_encoder(connector));
73}
74
75bool intel_crt_port_enabled(struct drm_i915_private *dev_priv,
76 i915_reg_t adpa_reg, enum pipe *pipe)
77{
78 u32 val;
79
80 val = intel_de_read(dev_priv, adpa_reg);
81
82 /* asserts want to know the pipe even if the port is disabled */
83 if (HAS_PCH_CPT(dev_priv))
84 *pipe = (val & ADPA_PIPE_SEL_MASK_CPT) >> ADPA_PIPE_SEL_SHIFT_CPT;
85 else
86 *pipe = (val & ADPA_PIPE_SEL_MASK) >> ADPA_PIPE_SEL_SHIFT;
87
88 return val & ADPA_DAC_ENABLE;
89}
90
91static bool intel_crt_get_hw_state(struct intel_encoder *encoder,
92 enum pipe *pipe)
93{
94 struct drm_i915_private *dev_priv = to_i915(encoder->base.dev);
95 struct intel_crt *crt = intel_encoder_to_crt(encoder);
96 intel_wakeref_t wakeref;
97 bool ret;
98
99 wakeref = intel_display_power_get_if_enabled(dev_priv,
100 encoder->power_domain);
101 if (!wakeref)
102 return false;
103
104 ret = intel_crt_port_enabled(dev_priv, crt->adpa_reg, pipe);
105
106 intel_display_power_put(dev_priv, encoder->power_domain, wakeref);
107
108 return ret;
109}
110
111static unsigned int intel_crt_get_flags(struct intel_encoder *encoder)
112{
113 struct drm_i915_private *dev_priv = to_i915(encoder->base.dev);
114 struct intel_crt *crt = intel_encoder_to_crt(encoder);
115 u32 tmp, flags = 0;
116
117 tmp = intel_de_read(dev_priv, crt->adpa_reg);
118
119 if (tmp & ADPA_HSYNC_ACTIVE_HIGH)
120 flags |= DRM_MODE_FLAG_PHSYNC;
121 else
122 flags |= DRM_MODE_FLAG_NHSYNC;
123
124 if (tmp & ADPA_VSYNC_ACTIVE_HIGH)
125 flags |= DRM_MODE_FLAG_PVSYNC;
126 else
127 flags |= DRM_MODE_FLAG_NVSYNC;
128
129 return flags;
130}
131
132static void intel_crt_get_config(struct intel_encoder *encoder,
133 struct intel_crtc_state *pipe_config)
134{
135 pipe_config->output_types |= BIT(INTEL_OUTPUT_ANALOG);
136
137 pipe_config->hw.adjusted_mode.flags |= intel_crt_get_flags(encoder);
138
139 pipe_config->hw.adjusted_mode.crtc_clock = pipe_config->port_clock;
140}
141
142static void hsw_crt_get_config(struct intel_encoder *encoder,
143 struct intel_crtc_state *pipe_config)
144{
145 struct drm_i915_private *dev_priv = to_i915(encoder->base.dev);
146
147 hsw_ddi_get_config(encoder, pipe_config);
148
149 pipe_config->hw.adjusted_mode.flags &= ~(DRM_MODE_FLAG_PHSYNC |
150 DRM_MODE_FLAG_NHSYNC |
151 DRM_MODE_FLAG_PVSYNC |
152 DRM_MODE_FLAG_NVSYNC);
153 pipe_config->hw.adjusted_mode.flags |= intel_crt_get_flags(encoder);
154
155 pipe_config->hw.adjusted_mode.crtc_clock = lpt_get_iclkip(dev_priv);
156}
157
158/* Note: The caller is required to filter out dpms modes not supported by the
159 * platform. */
160static void intel_crt_set_dpms(struct intel_encoder *encoder,
161 const struct intel_crtc_state *crtc_state,
162 int mode)
163{
164 struct drm_i915_private *dev_priv = to_i915(encoder->base.dev);
165 struct intel_crt *crt = intel_encoder_to_crt(encoder);
166 struct intel_crtc *crtc = to_intel_crtc(crtc_state->uapi.crtc);
167 const struct drm_display_mode *adjusted_mode = &crtc_state->hw.adjusted_mode;
168 u32 adpa;
169
170 if (DISPLAY_VER(dev_priv) >= 5)
171 adpa = ADPA_HOTPLUG_BITS;
172 else
173 adpa = 0;
174
175 if (adjusted_mode->flags & DRM_MODE_FLAG_PHSYNC)
176 adpa |= ADPA_HSYNC_ACTIVE_HIGH;
177 if (adjusted_mode->flags & DRM_MODE_FLAG_PVSYNC)
178 adpa |= ADPA_VSYNC_ACTIVE_HIGH;
179
180 /* For CPT allow 3 pipe config, for others just use A or B */
181 if (HAS_PCH_LPT(dev_priv))
182 ; /* Those bits don't exist here */
183 else if (HAS_PCH_CPT(dev_priv))
184 adpa |= ADPA_PIPE_SEL_CPT(crtc->pipe);
185 else
186 adpa |= ADPA_PIPE_SEL(crtc->pipe);
187
188 if (!HAS_PCH_SPLIT(dev_priv))
189 intel_de_write(dev_priv, BCLRPAT(crtc->pipe), 0);
190
191 switch (mode) {
192 case DRM_MODE_DPMS_ON:
193 adpa |= ADPA_DAC_ENABLE;
194 break;
195 case DRM_MODE_DPMS_STANDBY:
196 adpa |= ADPA_DAC_ENABLE | ADPA_HSYNC_CNTL_DISABLE;
197 break;
198 case DRM_MODE_DPMS_SUSPEND:
199 adpa |= ADPA_DAC_ENABLE | ADPA_VSYNC_CNTL_DISABLE;
200 break;
201 case DRM_MODE_DPMS_OFF:
202 adpa |= ADPA_HSYNC_CNTL_DISABLE | ADPA_VSYNC_CNTL_DISABLE;
203 break;
204 }
205
206 intel_de_write(dev_priv, crt->adpa_reg, adpa);
207}
208
209static void intel_disable_crt(struct intel_atomic_state *state,
210 struct intel_encoder *encoder,
211 const struct intel_crtc_state *old_crtc_state,
212 const struct drm_connector_state *old_conn_state)
213{
214 intel_crt_set_dpms(encoder, old_crtc_state, DRM_MODE_DPMS_OFF);
215}
216
217static void pch_disable_crt(struct intel_atomic_state *state,
218 struct intel_encoder *encoder,
219 const struct intel_crtc_state *old_crtc_state,
220 const struct drm_connector_state *old_conn_state)
221{
222}
223
224static void pch_post_disable_crt(struct intel_atomic_state *state,
225 struct intel_encoder *encoder,
226 const struct intel_crtc_state *old_crtc_state,
227 const struct drm_connector_state *old_conn_state)
228{
229 intel_disable_crt(state, encoder, old_crtc_state, old_conn_state);
230}
231
232static void hsw_disable_crt(struct intel_atomic_state *state,
233 struct intel_encoder *encoder,
234 const struct intel_crtc_state *old_crtc_state,
235 const struct drm_connector_state *old_conn_state)
236{
237 struct drm_i915_private *dev_priv = to_i915(encoder->base.dev);
238
239 drm_WARN_ON(&dev_priv->drm, !old_crtc_state->has_pch_encoder);
240
241 intel_set_pch_fifo_underrun_reporting(dev_priv, PIPE_A, false);
242}
243
244static void hsw_post_disable_crt(struct intel_atomic_state *state,
245 struct intel_encoder *encoder,
246 const struct intel_crtc_state *old_crtc_state,
247 const struct drm_connector_state *old_conn_state)
248{
249 struct drm_i915_private *dev_priv = to_i915(encoder->base.dev);
250
251 intel_crtc_vblank_off(old_crtc_state);
252
253 intel_disable_pipe(old_crtc_state);
254
255 intel_ddi_disable_transcoder_func(old_crtc_state);
256
257 ilk_pfit_disable(old_crtc_state);
258
259 intel_ddi_disable_pipe_clock(old_crtc_state);
260
261 pch_post_disable_crt(state, encoder, old_crtc_state, old_conn_state);
262
263 lpt_disable_pch_transcoder(dev_priv);
264 lpt_disable_iclkip(dev_priv);
265
266 intel_ddi_fdi_post_disable(state, encoder, old_crtc_state, old_conn_state);
267
268 drm_WARN_ON(&dev_priv->drm, !old_crtc_state->has_pch_encoder);
269
270 intel_set_pch_fifo_underrun_reporting(dev_priv, PIPE_A, true);
271}
272
273static void hsw_pre_pll_enable_crt(struct intel_atomic_state *state,
274 struct intel_encoder *encoder,
275 const struct intel_crtc_state *crtc_state,
276 const struct drm_connector_state *conn_state)
277{
278 struct drm_i915_private *dev_priv = to_i915(encoder->base.dev);
279
280 drm_WARN_ON(&dev_priv->drm, !crtc_state->has_pch_encoder);
281
282 intel_set_pch_fifo_underrun_reporting(dev_priv, PIPE_A, false);
283}
284
285static void hsw_pre_enable_crt(struct intel_atomic_state *state,
286 struct intel_encoder *encoder,
287 const struct intel_crtc_state *crtc_state,
288 const struct drm_connector_state *conn_state)
289{
290 struct drm_i915_private *dev_priv = to_i915(encoder->base.dev);
291 struct intel_crtc *crtc = to_intel_crtc(crtc_state->uapi.crtc);
292 enum pipe pipe = crtc->pipe;
293
294 drm_WARN_ON(&dev_priv->drm, !crtc_state->has_pch_encoder);
295
296 intel_set_cpu_fifo_underrun_reporting(dev_priv, pipe, false);
297
298 hsw_fdi_link_train(encoder, crtc_state);
299
300 intel_ddi_enable_pipe_clock(encoder, crtc_state);
301}
302
303static void hsw_enable_crt(struct intel_atomic_state *state,
304 struct intel_encoder *encoder,
305 const struct intel_crtc_state *crtc_state,
306 const struct drm_connector_state *conn_state)
307{
308 struct drm_i915_private *dev_priv = to_i915(encoder->base.dev);
309 struct intel_crtc *crtc = to_intel_crtc(crtc_state->uapi.crtc);
310 enum pipe pipe = crtc->pipe;
311
312 drm_WARN_ON(&dev_priv->drm, !crtc_state->has_pch_encoder);
313
314 intel_ddi_enable_transcoder_func(encoder, crtc_state);
315
316 intel_enable_pipe(crtc_state);
317
318 lpt_pch_enable(crtc_state);
319
320 intel_crtc_vblank_on(crtc_state);
321
322 intel_crt_set_dpms(encoder, crtc_state, DRM_MODE_DPMS_ON);
323
324 intel_wait_for_vblank(dev_priv, pipe);
325 intel_wait_for_vblank(dev_priv, pipe);
326 intel_set_cpu_fifo_underrun_reporting(dev_priv, pipe, true);
327 intel_set_pch_fifo_underrun_reporting(dev_priv, PIPE_A, true);
328}
329
330static void intel_enable_crt(struct intel_atomic_state *state,
331 struct intel_encoder *encoder,
332 const struct intel_crtc_state *crtc_state,
333 const struct drm_connector_state *conn_state)
334{
335 intel_crt_set_dpms(encoder, crtc_state, DRM_MODE_DPMS_ON);
336}
337
338static enum drm_mode_status
339intel_crt_mode_valid(struct drm_connector *connector,
340 struct drm_display_mode *mode)
341{
342 struct drm_device *dev = connector->dev;
343 struct drm_i915_private *dev_priv = to_i915(dev);
344 int max_dotclk = dev_priv->max_dotclk_freq;
345 int max_clock;
346
347 if (mode->flags & DRM_MODE_FLAG_DBLSCAN)
348 return MODE_NO_DBLESCAN;
349
350 if (mode->clock < 25000)
351 return MODE_CLOCK_LOW;
352
353 if (HAS_PCH_LPT(dev_priv))
354 max_clock = 180000;
355 else if (IS_VALLEYVIEW(dev_priv))
356 /*
357 * 270 MHz due to current DPLL limits,
358 * DAC limit supposedly 355 MHz.
359 */
360 max_clock = 270000;
361 else if (IS_DISPLAY_VER(dev_priv, 3, 4))
362 max_clock = 400000;
363 else
364 max_clock = 350000;
365 if (mode->clock > max_clock)
366 return MODE_CLOCK_HIGH;
367
368 if (mode->clock > max_dotclk)
369 return MODE_CLOCK_HIGH;
370
371 /* The FDI receiver on LPT only supports 8bpc and only has 2 lanes. */
372 if (HAS_PCH_LPT(dev_priv) &&
373 ilk_get_lanes_required(mode->clock, 270000, 24) > 2)
374 return MODE_CLOCK_HIGH;
375
376 /* HSW/BDW FDI limited to 4k */
377 if (mode->hdisplay > 4096)
378 return MODE_H_ILLEGAL;
379
380 return MODE_OK;
381}
382
383static int intel_crt_compute_config(struct intel_encoder *encoder,
384 struct intel_crtc_state *pipe_config,
385 struct drm_connector_state *conn_state)
386{
387 struct drm_display_mode *adjusted_mode =
388 &pipe_config->hw.adjusted_mode;
389
390 if (adjusted_mode->flags & DRM_MODE_FLAG_DBLSCAN)
391 return -EINVAL;
392
393 pipe_config->output_format = INTEL_OUTPUT_FORMAT_RGB;
394
395 return 0;
396}
397
398static int pch_crt_compute_config(struct intel_encoder *encoder,
399 struct intel_crtc_state *pipe_config,
400 struct drm_connector_state *conn_state)
401{
402 struct drm_display_mode *adjusted_mode =
403 &pipe_config->hw.adjusted_mode;
404
405 if (adjusted_mode->flags & DRM_MODE_FLAG_DBLSCAN)
406 return -EINVAL;
407
408 pipe_config->has_pch_encoder = true;
409 pipe_config->output_format = INTEL_OUTPUT_FORMAT_RGB;
410
411 return 0;
412}
413
414static int hsw_crt_compute_config(struct intel_encoder *encoder,
415 struct intel_crtc_state *pipe_config,
416 struct drm_connector_state *conn_state)
417{
418 struct drm_i915_private *dev_priv = to_i915(encoder->base.dev);
419 struct drm_display_mode *adjusted_mode =
420 &pipe_config->hw.adjusted_mode;
421
422 if (adjusted_mode->flags & DRM_MODE_FLAG_DBLSCAN)
423 return -EINVAL;
424
425 /* HSW/BDW FDI limited to 4k */
426 if (adjusted_mode->crtc_hdisplay > 4096 ||
427 adjusted_mode->crtc_hblank_start > 4096)
428 return -EINVAL;
429
430 pipe_config->has_pch_encoder = true;
431 pipe_config->output_format = INTEL_OUTPUT_FORMAT_RGB;
432
433 /* LPT FDI RX only supports 8bpc. */
434 if (HAS_PCH_LPT(dev_priv)) {
435 if (pipe_config->bw_constrained && pipe_config->pipe_bpp < 24) {
436 drm_dbg_kms(&dev_priv->drm,
437 "LPT only supports 24bpp\n");
438 return -EINVAL;
439 }
440
441 pipe_config->pipe_bpp = 24;
442 }
443
444 /* FDI must always be 2.7 GHz */
445 pipe_config->port_clock = 135000 * 2;
446
447 return 0;
448}
449
450static bool ilk_crt_detect_hotplug(struct drm_connector *connector)
451{
452 struct drm_device *dev = connector->dev;
453 struct intel_crt *crt = intel_attached_crt(to_intel_connector(connector));
454 struct drm_i915_private *dev_priv = to_i915(dev);
455 u32 adpa;
456 bool ret;
457
458 /* The first time through, trigger an explicit detection cycle */
459 if (crt->force_hotplug_required) {
460 bool turn_off_dac = HAS_PCH_SPLIT(dev_priv);
461 u32 save_adpa;
462
463 crt->force_hotplug_required = false;
464
465 save_adpa = adpa = intel_de_read(dev_priv, crt->adpa_reg);
466 drm_dbg_kms(&dev_priv->drm,
467 "trigger hotplug detect cycle: adpa=0x%x\n", adpa);
468
469 adpa |= ADPA_CRT_HOTPLUG_FORCE_TRIGGER;
470 if (turn_off_dac)
471 adpa &= ~ADPA_DAC_ENABLE;
472
473 intel_de_write(dev_priv, crt->adpa_reg, adpa);
474
475 if (intel_de_wait_for_clear(dev_priv,
476 crt->adpa_reg,
477 ADPA_CRT_HOTPLUG_FORCE_TRIGGER,
478 1000))
479 drm_dbg_kms(&dev_priv->drm,
480 "timed out waiting for FORCE_TRIGGER");
481
482 if (turn_off_dac) {
483 intel_de_write(dev_priv, crt->adpa_reg, save_adpa);
484 intel_de_posting_read(dev_priv, crt->adpa_reg);
485 }
486 }
487
488 /* Check the status to see if both blue and green are on now */
489 adpa = intel_de_read(dev_priv, crt->adpa_reg);
490 if ((adpa & ADPA_CRT_HOTPLUG_MONITOR_MASK) != 0)
491 ret = true;
492 else
493 ret = false;
494 drm_dbg_kms(&dev_priv->drm, "ironlake hotplug adpa=0x%x, result %d\n",
495 adpa, ret);
496
497 return ret;
498}
499
500static bool valleyview_crt_detect_hotplug(struct drm_connector *connector)
501{
502 struct drm_device *dev = connector->dev;
503 struct intel_crt *crt = intel_attached_crt(to_intel_connector(connector));
504 struct drm_i915_private *dev_priv = to_i915(dev);
505 bool reenable_hpd;
506 u32 adpa;
507 bool ret;
508 u32 save_adpa;
509
510 /*
511 * Doing a force trigger causes a hpd interrupt to get sent, which can
512 * get us stuck in a loop if we're polling:
513 * - We enable power wells and reset the ADPA
514 * - output_poll_exec does force probe on VGA, triggering a hpd
515 * - HPD handler waits for poll to unlock dev->mode_config.mutex
516 * - output_poll_exec shuts off the ADPA, unlocks
517 * dev->mode_config.mutex
518 * - HPD handler runs, resets ADPA and brings us back to the start
519 *
520 * Just disable HPD interrupts here to prevent this
521 */
522 reenable_hpd = intel_hpd_disable(dev_priv, crt->base.hpd_pin);
523
524 save_adpa = adpa = intel_de_read(dev_priv, crt->adpa_reg);
525 drm_dbg_kms(&dev_priv->drm,
526 "trigger hotplug detect cycle: adpa=0x%x\n", adpa);
527
528 adpa |= ADPA_CRT_HOTPLUG_FORCE_TRIGGER;
529
530 intel_de_write(dev_priv, crt->adpa_reg, adpa);
531
532 if (intel_de_wait_for_clear(dev_priv, crt->adpa_reg,
533 ADPA_CRT_HOTPLUG_FORCE_TRIGGER, 1000)) {
534 drm_dbg_kms(&dev_priv->drm,
535 "timed out waiting for FORCE_TRIGGER");
536 intel_de_write(dev_priv, crt->adpa_reg, save_adpa);
537 }
538
539 /* Check the status to see if both blue and green are on now */
540 adpa = intel_de_read(dev_priv, crt->adpa_reg);
541 if ((adpa & ADPA_CRT_HOTPLUG_MONITOR_MASK) != 0)
542 ret = true;
543 else
544 ret = false;
545
546 drm_dbg_kms(&dev_priv->drm,
547 "valleyview hotplug adpa=0x%x, result %d\n", adpa, ret);
548
549 if (reenable_hpd)
550 intel_hpd_enable(dev_priv, crt->base.hpd_pin);
551
552 return ret;
553}
554
555static bool intel_crt_detect_hotplug(struct drm_connector *connector)
556{
557 struct drm_device *dev = connector->dev;
558 struct drm_i915_private *dev_priv = to_i915(dev);
559 u32 stat;
560 bool ret = false;
561 int i, tries = 0;
562
563 if (HAS_PCH_SPLIT(dev_priv))
564 return ilk_crt_detect_hotplug(connector);
565
566 if (IS_VALLEYVIEW(dev_priv))
567 return valleyview_crt_detect_hotplug(connector);
568
569 /*
570 * On 4 series desktop, CRT detect sequence need to be done twice
571 * to get a reliable result.
572 */
573
574 if (IS_G45(dev_priv))
575 tries = 2;
576 else
577 tries = 1;
578
579 for (i = 0; i < tries ; i++) {
580 /* turn on the FORCE_DETECT */
581 i915_hotplug_interrupt_update(dev_priv,
582 CRT_HOTPLUG_FORCE_DETECT,
583 CRT_HOTPLUG_FORCE_DETECT);
584 /* wait for FORCE_DETECT to go off */
585 if (intel_de_wait_for_clear(dev_priv, PORT_HOTPLUG_EN,
586 CRT_HOTPLUG_FORCE_DETECT, 1000))
587 drm_dbg_kms(&dev_priv->drm,
588 "timed out waiting for FORCE_DETECT to go off");
589 }
590
591 stat = intel_de_read(dev_priv, PORT_HOTPLUG_STAT);
592 if ((stat & CRT_HOTPLUG_MONITOR_MASK) != CRT_HOTPLUG_MONITOR_NONE)
593 ret = true;
594
595 /* clear the interrupt we just generated, if any */
596 intel_de_write(dev_priv, PORT_HOTPLUG_STAT, CRT_HOTPLUG_INT_STATUS);
597
598 i915_hotplug_interrupt_update(dev_priv, CRT_HOTPLUG_FORCE_DETECT, 0);
599
600 return ret;
601}
602
603static struct edid *intel_crt_get_edid(struct drm_connector *connector,
604 struct i2c_adapter *i2c)
605{
606 struct edid *edid;
607
608 edid = drm_get_edid(connector, i2c);
609
610 if (!edid && !intel_gmbus_is_forced_bit(i2c)) {
611 drm_dbg_kms(connector->dev,
612 "CRT GMBUS EDID read failed, retry using GPIO bit-banging\n");
613 intel_gmbus_force_bit(i2c, true);
614 edid = drm_get_edid(connector, i2c);
615 intel_gmbus_force_bit(i2c, false);
616 }
617
618 return edid;
619}
620
621/* local version of intel_ddc_get_modes() to use intel_crt_get_edid() */
622static int intel_crt_ddc_get_modes(struct drm_connector *connector,
623 struct i2c_adapter *adapter)
624{
625 struct edid *edid;
626 int ret;
627
628 edid = intel_crt_get_edid(connector, adapter);
629 if (!edid)
630 return 0;
631
632 ret = intel_connector_update_modes(connector, edid);
633 kfree(edid);
634
635 return ret;
636}
637
638static bool intel_crt_detect_ddc(struct drm_connector *connector)
639{
640 struct intel_crt *crt = intel_attached_crt(to_intel_connector(connector));
641 struct drm_i915_private *dev_priv = to_i915(crt->base.base.dev);
642 struct edid *edid;
643 struct i2c_adapter *i2c;
644 bool ret = false;
645
646 BUG_ON(crt->base.type != INTEL_OUTPUT_ANALOG);
647
648 i2c = intel_gmbus_get_adapter(dev_priv, dev_priv->vbt.crt_ddc_pin);
649 edid = intel_crt_get_edid(connector, i2c);
650
651 if (edid) {
652 bool is_digital = edid->input & DRM_EDID_INPUT_DIGITAL;
653
654 /*
655 * This may be a DVI-I connector with a shared DDC
656 * link between analog and digital outputs, so we
657 * have to check the EDID input spec of the attached device.
658 */
659 if (!is_digital) {
660 drm_dbg_kms(&dev_priv->drm,
661 "CRT detected via DDC:0x50 [EDID]\n");
662 ret = true;
663 } else {
664 drm_dbg_kms(&dev_priv->drm,
665 "CRT not detected via DDC:0x50 [EDID reports a digital panel]\n");
666 }
667 } else {
668 drm_dbg_kms(&dev_priv->drm,
669 "CRT not detected via DDC:0x50 [no valid EDID found]\n");
670 }
671
672 kfree(edid);
673
674 return ret;
675}
676
677static enum drm_connector_status
678intel_crt_load_detect(struct intel_crt *crt, u32 pipe)
679{
680 struct drm_device *dev = crt->base.base.dev;
681 struct drm_i915_private *dev_priv = to_i915(dev);
682 struct intel_uncore *uncore = &dev_priv->uncore;
683 u32 save_bclrpat;
684 u32 save_vtotal;
685 u32 vtotal, vactive;
686 u32 vsample;
687 u32 vblank, vblank_start, vblank_end;
688 u32 dsl;
689 i915_reg_t bclrpat_reg, vtotal_reg,
690 vblank_reg, vsync_reg, pipeconf_reg, pipe_dsl_reg;
691 u8 st00;
692 enum drm_connector_status status;
693
694 drm_dbg_kms(&dev_priv->drm, "starting load-detect on CRT\n");
695
696 bclrpat_reg = BCLRPAT(pipe);
697 vtotal_reg = VTOTAL(pipe);
698 vblank_reg = VBLANK(pipe);
699 vsync_reg = VSYNC(pipe);
700 pipeconf_reg = PIPECONF(pipe);
701 pipe_dsl_reg = PIPEDSL(pipe);
702
703 save_bclrpat = intel_uncore_read(uncore, bclrpat_reg);
704 save_vtotal = intel_uncore_read(uncore, vtotal_reg);
705 vblank = intel_uncore_read(uncore, vblank_reg);
706
707 vtotal = ((save_vtotal >> 16) & 0xfff) + 1;
708 vactive = (save_vtotal & 0x7ff) + 1;
709
710 vblank_start = (vblank & 0xfff) + 1;
711 vblank_end = ((vblank >> 16) & 0xfff) + 1;
712
713 /* Set the border color to purple. */
714 intel_uncore_write(uncore, bclrpat_reg, 0x500050);
715
716 if (DISPLAY_VER(dev_priv) != 2) {
717 u32 pipeconf = intel_uncore_read(uncore, pipeconf_reg);
718 intel_uncore_write(uncore,
719 pipeconf_reg,
720 pipeconf | PIPECONF_FORCE_BORDER);
721 intel_uncore_posting_read(uncore, pipeconf_reg);
722 /* Wait for next Vblank to substitue
723 * border color for Color info */
724 intel_wait_for_vblank(dev_priv, pipe);
725 st00 = intel_uncore_read8(uncore, _VGA_MSR_WRITE);
726 status = ((st00 & (1 << 4)) != 0) ?
727 connector_status_connected :
728 connector_status_disconnected;
729
730 intel_uncore_write(uncore, pipeconf_reg, pipeconf);
731 } else {
732 bool restore_vblank = false;
733 int count, detect;
734
735 /*
736 * If there isn't any border, add some.
737 * Yes, this will flicker
738 */
739 if (vblank_start <= vactive && vblank_end >= vtotal) {
740 u32 vsync = intel_de_read(dev_priv, vsync_reg);
741 u32 vsync_start = (vsync & 0xffff) + 1;
742
743 vblank_start = vsync_start;
744 intel_uncore_write(uncore,
745 vblank_reg,
746 (vblank_start - 1) |
747 ((vblank_end - 1) << 16));
748 restore_vblank = true;
749 }
750 /* sample in the vertical border, selecting the larger one */
751 if (vblank_start - vactive >= vtotal - vblank_end)
752 vsample = (vblank_start + vactive) >> 1;
753 else
754 vsample = (vtotal + vblank_end) >> 1;
755
756 /*
757 * Wait for the border to be displayed
758 */
759 while (intel_uncore_read(uncore, pipe_dsl_reg) >= vactive)
760 ;
761 while ((dsl = intel_uncore_read(uncore, pipe_dsl_reg)) <=
762 vsample)
763 ;
764 /*
765 * Watch ST00 for an entire scanline
766 */
767 detect = 0;
768 count = 0;
769 do {
770 count++;
771 /* Read the ST00 VGA status register */
772 st00 = intel_uncore_read8(uncore, _VGA_MSR_WRITE);
773 if (st00 & (1 << 4))
774 detect++;
775 } while ((intel_uncore_read(uncore, pipe_dsl_reg) == dsl));
776
777 /* restore vblank if necessary */
778 if (restore_vblank)
779 intel_uncore_write(uncore, vblank_reg, vblank);
780 /*
781 * If more than 3/4 of the scanline detected a monitor,
782 * then it is assumed to be present. This works even on i830,
783 * where there isn't any way to force the border color across
784 * the screen
785 */
786 status = detect * 4 > count * 3 ?
787 connector_status_connected :
788 connector_status_disconnected;
789 }
790
791 /* Restore previous settings */
792 intel_uncore_write(uncore, bclrpat_reg, save_bclrpat);
793
794 return status;
795}
796
797static int intel_spurious_crt_detect_dmi_callback(const struct dmi_system_id *id)
798{
799 DRM_DEBUG_DRIVER("Skipping CRT detection for %s\n", id->ident);
800 return 1;
801}
802
803static const struct dmi_system_id intel_spurious_crt_detect[] = {
804 {
805 .callback = intel_spurious_crt_detect_dmi_callback,
806 .ident = "ACER ZGB",
807 .matches = {
808 DMI_MATCH(DMI_SYS_VENDOR, "ACER"),
809 DMI_MATCH(DMI_PRODUCT_NAME, "ZGB"),
810 },
811 },
812 {
813 .callback = intel_spurious_crt_detect_dmi_callback,
814 .ident = "Intel DZ77BH-55K",
815 .matches = {
816 DMI_MATCH(DMI_BOARD_VENDOR, "Intel Corporation"),
817 DMI_MATCH(DMI_BOARD_NAME, "DZ77BH-55K"),
818 },
819 },
820 { }
821};
822
823static int
824intel_crt_detect(struct drm_connector *connector,
825 struct drm_modeset_acquire_ctx *ctx,
826 bool force)
827{
828 struct drm_i915_private *dev_priv = to_i915(connector->dev);
829 struct intel_crt *crt = intel_attached_crt(to_intel_connector(connector));
830 struct intel_encoder *intel_encoder = &crt->base;
831 intel_wakeref_t wakeref;
832 int status, ret;
833 struct intel_load_detect_pipe tmp;
834
835 drm_dbg_kms(&dev_priv->drm, "[CONNECTOR:%d:%s] force=%d\n",
836 connector->base.id, connector->name,
837 force);
838
839 if (!INTEL_DISPLAY_ENABLED(dev_priv))
840 return connector_status_disconnected;
841
842 if (dev_priv->params.load_detect_test) {
843 wakeref = intel_display_power_get(dev_priv,
844 intel_encoder->power_domain);
845 goto load_detect;
846 }
847
848 /* Skip machines without VGA that falsely report hotplug events */
849 if (dmi_check_system(intel_spurious_crt_detect))
850 return connector_status_disconnected;
851
852 wakeref = intel_display_power_get(dev_priv,
853 intel_encoder->power_domain);
854
855 if (I915_HAS_HOTPLUG(dev_priv)) {
856 /* We can not rely on the HPD pin always being correctly wired
857 * up, for example many KVM do not pass it through, and so
858 * only trust an assertion that the monitor is connected.
859 */
860 if (intel_crt_detect_hotplug(connector)) {
861 drm_dbg_kms(&dev_priv->drm,
862 "CRT detected via hotplug\n");
863 status = connector_status_connected;
864 goto out;
865 } else
866 drm_dbg_kms(&dev_priv->drm,
867 "CRT not detected via hotplug\n");
868 }
869
870 if (intel_crt_detect_ddc(connector)) {
871 status = connector_status_connected;
872 goto out;
873 }
874
875 /* Load detection is broken on HPD capable machines. Whoever wants a
876 * broken monitor (without edid) to work behind a broken kvm (that fails
877 * to have the right resistors for HP detection) needs to fix this up.
878 * For now just bail out. */
879 if (I915_HAS_HOTPLUG(dev_priv)) {
880 status = connector_status_disconnected;
881 goto out;
882 }
883
884load_detect:
885 if (!force) {
886 status = connector->status;
887 goto out;
888 }
889
890 /* for pre-945g platforms use load detect */
891 ret = intel_get_load_detect_pipe(connector, &tmp, ctx);
892 if (ret > 0) {
893 if (intel_crt_detect_ddc(connector))
894 status = connector_status_connected;
895 else if (DISPLAY_VER(dev_priv) < 4)
896 status = intel_crt_load_detect(crt,
897 to_intel_crtc(connector->state->crtc)->pipe);
898 else if (dev_priv->params.load_detect_test)
899 status = connector_status_disconnected;
900 else
901 status = connector_status_unknown;
902 intel_release_load_detect_pipe(connector, &tmp, ctx);
903 } else if (ret == 0) {
904 status = connector_status_unknown;
905 } else {
906 status = ret;
907 }
908
909out:
910 intel_display_power_put(dev_priv, intel_encoder->power_domain, wakeref);
911
912 /*
913 * Make sure the refs for power wells enabled during detect are
914 * dropped to avoid a new detect cycle triggered by HPD polling.
915 */
916 intel_display_power_flush_work(dev_priv);
917
918 return status;
919}
920
921static int intel_crt_get_modes(struct drm_connector *connector)
922{
923 struct drm_device *dev = connector->dev;
924 struct drm_i915_private *dev_priv = to_i915(dev);
925 struct intel_crt *crt = intel_attached_crt(to_intel_connector(connector));
926 struct intel_encoder *intel_encoder = &crt->base;
927 intel_wakeref_t wakeref;
928 struct i2c_adapter *i2c;
929 int ret;
930
931 wakeref = intel_display_power_get(dev_priv,
932 intel_encoder->power_domain);
933
934 i2c = intel_gmbus_get_adapter(dev_priv, dev_priv->vbt.crt_ddc_pin);
935 ret = intel_crt_ddc_get_modes(connector, i2c);
936 if (ret || !IS_G4X(dev_priv))
937 goto out;
938
939 /* Try to probe digital port for output in DVI-I -> VGA mode. */
940 i2c = intel_gmbus_get_adapter(dev_priv, GMBUS_PIN_DPB);
941 ret = intel_crt_ddc_get_modes(connector, i2c);
942
943out:
944 intel_display_power_put(dev_priv, intel_encoder->power_domain, wakeref);
945
946 return ret;
947}
948
949void intel_crt_reset(struct drm_encoder *encoder)
950{
951 struct drm_i915_private *dev_priv = to_i915(encoder->dev);
952 struct intel_crt *crt = intel_encoder_to_crt(to_intel_encoder(encoder));
953
954 if (DISPLAY_VER(dev_priv) >= 5) {
955 u32 adpa;
956
957 adpa = intel_de_read(dev_priv, crt->adpa_reg);
958 adpa &= ~ADPA_CRT_HOTPLUG_MASK;
959 adpa |= ADPA_HOTPLUG_BITS;
960 intel_de_write(dev_priv, crt->adpa_reg, adpa);
961 intel_de_posting_read(dev_priv, crt->adpa_reg);
962
963 drm_dbg_kms(&dev_priv->drm, "crt adpa set to 0x%x\n", adpa);
964 crt->force_hotplug_required = true;
965 }
966
967}
968
969/*
970 * Routines for controlling stuff on the analog port
971 */
972
973static const struct drm_connector_funcs intel_crt_connector_funcs = {
974 .fill_modes = drm_helper_probe_single_connector_modes,
975 .late_register = intel_connector_register,
976 .early_unregister = intel_connector_unregister,
977 .destroy = intel_connector_destroy,
978 .atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
979 .atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
980};
981
982static const struct drm_connector_helper_funcs intel_crt_connector_helper_funcs = {
983 .detect_ctx = intel_crt_detect,
984 .mode_valid = intel_crt_mode_valid,
985 .get_modes = intel_crt_get_modes,
986};
987
988static const struct drm_encoder_funcs intel_crt_enc_funcs = {
989 .reset = intel_crt_reset,
990 .destroy = intel_encoder_destroy,
991};
992
993void intel_crt_init(struct drm_i915_private *dev_priv)
994{
995 struct drm_connector *connector;
996 struct intel_crt *crt;
997 struct intel_connector *intel_connector;
998 i915_reg_t adpa_reg;
999 u32 adpa;
1000
1001 if (HAS_PCH_SPLIT(dev_priv))
1002 adpa_reg = PCH_ADPA;
1003 else if (IS_VALLEYVIEW(dev_priv))
1004 adpa_reg = VLV_ADPA;
1005 else
1006 adpa_reg = ADPA;
1007
1008 adpa = intel_de_read(dev_priv, adpa_reg);
1009 if ((adpa & ADPA_DAC_ENABLE) == 0) {
1010 /*
1011 * On some machines (some IVB at least) CRT can be
1012 * fused off, but there's no known fuse bit to
1013 * indicate that. On these machine the ADPA register
1014 * works normally, except the DAC enable bit won't
1015 * take. So the only way to tell is attempt to enable
1016 * it and see what happens.
1017 */
1018 intel_de_write(dev_priv, adpa_reg,
1019 adpa | ADPA_DAC_ENABLE | ADPA_HSYNC_CNTL_DISABLE | ADPA_VSYNC_CNTL_DISABLE);
1020 if ((intel_de_read(dev_priv, adpa_reg) & ADPA_DAC_ENABLE) == 0)
1021 return;
1022 intel_de_write(dev_priv, adpa_reg, adpa);
1023 }
1024
1025 crt = kzalloc(sizeof(struct intel_crt), GFP_KERNEL);
1026 if (!crt)
1027 return;
1028
1029 intel_connector = intel_connector_alloc();
1030 if (!intel_connector) {
1031 kfree(crt);
1032 return;
1033 }
1034
1035 connector = &intel_connector->base;
1036 crt->connector = intel_connector;
1037 drm_connector_init(&dev_priv->drm, &intel_connector->base,
1038 &intel_crt_connector_funcs, DRM_MODE_CONNECTOR_VGA);
1039
1040 drm_encoder_init(&dev_priv->drm, &crt->base.base, &intel_crt_enc_funcs,
1041 DRM_MODE_ENCODER_DAC, "CRT");
1042
1043 intel_connector_attach_encoder(intel_connector, &crt->base);
1044
1045 crt->base.type = INTEL_OUTPUT_ANALOG;
1046 crt->base.cloneable = (1 << INTEL_OUTPUT_DVO) | (1 << INTEL_OUTPUT_HDMI);
1047 if (IS_I830(dev_priv))
1048 crt->base.pipe_mask = BIT(PIPE_A);
1049 else
1050 crt->base.pipe_mask = ~0;
1051
1052 if (DISPLAY_VER(dev_priv) == 2)
1053 connector->interlace_allowed = 0;
1054 else
1055 connector->interlace_allowed = 1;
1056 connector->doublescan_allowed = 0;
1057
1058 crt->adpa_reg = adpa_reg;
1059
1060 crt->base.power_domain = POWER_DOMAIN_PORT_CRT;
1061
1062 if (I915_HAS_HOTPLUG(dev_priv) &&
1063 !dmi_check_system(intel_spurious_crt_detect)) {
1064 crt->base.hpd_pin = HPD_CRT;
1065 crt->base.hotplug = intel_encoder_hotplug;
1066 intel_connector->polled = DRM_CONNECTOR_POLL_HPD;
1067 } else {
1068 intel_connector->polled = DRM_CONNECTOR_POLL_CONNECT;
1069 }
1070
1071 if (HAS_DDI(dev_priv)) {
1072 crt->base.port = PORT_E;
1073 crt->base.get_config = hsw_crt_get_config;
1074 crt->base.get_hw_state = intel_ddi_get_hw_state;
1075 crt->base.compute_config = hsw_crt_compute_config;
1076 crt->base.pre_pll_enable = hsw_pre_pll_enable_crt;
1077 crt->base.pre_enable = hsw_pre_enable_crt;
1078 crt->base.enable = hsw_enable_crt;
1079 crt->base.disable = hsw_disable_crt;
1080 crt->base.post_disable = hsw_post_disable_crt;
1081 crt->base.enable_clock = hsw_ddi_enable_clock;
1082 crt->base.disable_clock = hsw_ddi_disable_clock;
1083 crt->base.is_clock_enabled = hsw_ddi_is_clock_enabled;
1084 } else {
1085 if (HAS_PCH_SPLIT(dev_priv)) {
1086 crt->base.compute_config = pch_crt_compute_config;
1087 crt->base.disable = pch_disable_crt;
1088 crt->base.post_disable = pch_post_disable_crt;
1089 } else {
1090 crt->base.compute_config = intel_crt_compute_config;
1091 crt->base.disable = intel_disable_crt;
1092 }
1093 crt->base.port = PORT_NONE;
1094 crt->base.get_config = intel_crt_get_config;
1095 crt->base.get_hw_state = intel_crt_get_hw_state;
1096 crt->base.enable = intel_enable_crt;
1097 }
1098 intel_connector->get_hw_state = intel_connector_get_hw_state;
1099
1100 drm_connector_helper_add(connector, &intel_crt_connector_helper_funcs);
1101
1102 /*
1103 * TODO: find a proper way to discover whether we need to set the the
1104 * polarity and link reversal bits or not, instead of relying on the
1105 * BIOS.
1106 */
1107 if (HAS_PCH_LPT(dev_priv)) {
1108 u32 fdi_config = FDI_RX_POLARITY_REVERSED_LPT |
1109 FDI_RX_LINK_REVERSAL_OVERRIDE;
1110
1111 dev_priv->fdi_rx_config = intel_de_read(dev_priv,
1112 FDI_RX_CTL(PIPE_A)) & fdi_config;
1113 }
1114
1115 intel_crt_reset(&crt->base.base);
1116}