Loading...
Note: File does not exist in v3.1.
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_ddi.h"
40#include "intel_display_types.h"
41#include "intel_fifo_underrun.h"
42#include "intel_gmbus.h"
43#include "intel_hotplug.h"
44
45/* Here's the desired hotplug mode */
46#define ADPA_HOTPLUG_BITS (ADPA_CRT_HOTPLUG_PERIOD_128 | \
47 ADPA_CRT_HOTPLUG_WARMUP_10MS | \
48 ADPA_CRT_HOTPLUG_SAMPLE_4S | \
49 ADPA_CRT_HOTPLUG_VOLTAGE_50 | \
50 ADPA_CRT_HOTPLUG_VOLREF_325MV | \
51 ADPA_CRT_HOTPLUG_ENABLE)
52
53struct intel_crt {
54 struct intel_encoder base;
55 /* DPMS state is stored in the connector, which we need in the
56 * encoder's enable/disable callbacks */
57 struct intel_connector *connector;
58 bool force_hotplug_required;
59 i915_reg_t adpa_reg;
60};
61
62static struct intel_crt *intel_encoder_to_crt(struct intel_encoder *encoder)
63{
64 return container_of(encoder, struct intel_crt, base);
65}
66
67static struct intel_crt *intel_attached_crt(struct intel_connector *connector)
68{
69 return intel_encoder_to_crt(intel_attached_encoder(connector));
70}
71
72bool intel_crt_port_enabled(struct drm_i915_private *dev_priv,
73 i915_reg_t adpa_reg, enum pipe *pipe)
74{
75 u32 val;
76
77 val = intel_de_read(dev_priv, adpa_reg);
78
79 /* asserts want to know the pipe even if the port is disabled */
80 if (HAS_PCH_CPT(dev_priv))
81 *pipe = (val & ADPA_PIPE_SEL_MASK_CPT) >> ADPA_PIPE_SEL_SHIFT_CPT;
82 else
83 *pipe = (val & ADPA_PIPE_SEL_MASK) >> ADPA_PIPE_SEL_SHIFT;
84
85 return val & ADPA_DAC_ENABLE;
86}
87
88static bool intel_crt_get_hw_state(struct intel_encoder *encoder,
89 enum pipe *pipe)
90{
91 struct drm_i915_private *dev_priv = to_i915(encoder->base.dev);
92 struct intel_crt *crt = intel_encoder_to_crt(encoder);
93 intel_wakeref_t wakeref;
94 bool ret;
95
96 wakeref = intel_display_power_get_if_enabled(dev_priv,
97 encoder->power_domain);
98 if (!wakeref)
99 return false;
100
101 ret = intel_crt_port_enabled(dev_priv, crt->adpa_reg, pipe);
102
103 intel_display_power_put(dev_priv, encoder->power_domain, wakeref);
104
105 return ret;
106}
107
108static unsigned int intel_crt_get_flags(struct intel_encoder *encoder)
109{
110 struct drm_i915_private *dev_priv = to_i915(encoder->base.dev);
111 struct intel_crt *crt = intel_encoder_to_crt(encoder);
112 u32 tmp, flags = 0;
113
114 tmp = intel_de_read(dev_priv, crt->adpa_reg);
115
116 if (tmp & ADPA_HSYNC_ACTIVE_HIGH)
117 flags |= DRM_MODE_FLAG_PHSYNC;
118 else
119 flags |= DRM_MODE_FLAG_NHSYNC;
120
121 if (tmp & ADPA_VSYNC_ACTIVE_HIGH)
122 flags |= DRM_MODE_FLAG_PVSYNC;
123 else
124 flags |= DRM_MODE_FLAG_NVSYNC;
125
126 return flags;
127}
128
129static void intel_crt_get_config(struct intel_encoder *encoder,
130 struct intel_crtc_state *pipe_config)
131{
132 pipe_config->output_types |= BIT(INTEL_OUTPUT_ANALOG);
133
134 pipe_config->hw.adjusted_mode.flags |= intel_crt_get_flags(encoder);
135
136 pipe_config->hw.adjusted_mode.crtc_clock = pipe_config->port_clock;
137}
138
139static void hsw_crt_get_config(struct intel_encoder *encoder,
140 struct intel_crtc_state *pipe_config)
141{
142 struct drm_i915_private *dev_priv = to_i915(encoder->base.dev);
143
144 intel_ddi_get_config(encoder, pipe_config);
145
146 pipe_config->hw.adjusted_mode.flags &= ~(DRM_MODE_FLAG_PHSYNC |
147 DRM_MODE_FLAG_NHSYNC |
148 DRM_MODE_FLAG_PVSYNC |
149 DRM_MODE_FLAG_NVSYNC);
150 pipe_config->hw.adjusted_mode.flags |= intel_crt_get_flags(encoder);
151
152 pipe_config->hw.adjusted_mode.crtc_clock = lpt_get_iclkip(dev_priv);
153}
154
155/* Note: The caller is required to filter out dpms modes not supported by the
156 * platform. */
157static void intel_crt_set_dpms(struct intel_encoder *encoder,
158 const struct intel_crtc_state *crtc_state,
159 int mode)
160{
161 struct drm_i915_private *dev_priv = to_i915(encoder->base.dev);
162 struct intel_crt *crt = intel_encoder_to_crt(encoder);
163 struct intel_crtc *crtc = to_intel_crtc(crtc_state->uapi.crtc);
164 const struct drm_display_mode *adjusted_mode = &crtc_state->hw.adjusted_mode;
165 u32 adpa;
166
167 if (INTEL_GEN(dev_priv) >= 5)
168 adpa = ADPA_HOTPLUG_BITS;
169 else
170 adpa = 0;
171
172 if (adjusted_mode->flags & DRM_MODE_FLAG_PHSYNC)
173 adpa |= ADPA_HSYNC_ACTIVE_HIGH;
174 if (adjusted_mode->flags & DRM_MODE_FLAG_PVSYNC)
175 adpa |= ADPA_VSYNC_ACTIVE_HIGH;
176
177 /* For CPT allow 3 pipe config, for others just use A or B */
178 if (HAS_PCH_LPT(dev_priv))
179 ; /* Those bits don't exist here */
180 else if (HAS_PCH_CPT(dev_priv))
181 adpa |= ADPA_PIPE_SEL_CPT(crtc->pipe);
182 else
183 adpa |= ADPA_PIPE_SEL(crtc->pipe);
184
185 if (!HAS_PCH_SPLIT(dev_priv))
186 intel_de_write(dev_priv, BCLRPAT(crtc->pipe), 0);
187
188 switch (mode) {
189 case DRM_MODE_DPMS_ON:
190 adpa |= ADPA_DAC_ENABLE;
191 break;
192 case DRM_MODE_DPMS_STANDBY:
193 adpa |= ADPA_DAC_ENABLE | ADPA_HSYNC_CNTL_DISABLE;
194 break;
195 case DRM_MODE_DPMS_SUSPEND:
196 adpa |= ADPA_DAC_ENABLE | ADPA_VSYNC_CNTL_DISABLE;
197 break;
198 case DRM_MODE_DPMS_OFF:
199 adpa |= ADPA_HSYNC_CNTL_DISABLE | ADPA_VSYNC_CNTL_DISABLE;
200 break;
201 }
202
203 intel_de_write(dev_priv, crt->adpa_reg, adpa);
204}
205
206static void intel_disable_crt(struct intel_atomic_state *state,
207 struct intel_encoder *encoder,
208 const struct intel_crtc_state *old_crtc_state,
209 const struct drm_connector_state *old_conn_state)
210{
211 intel_crt_set_dpms(encoder, old_crtc_state, DRM_MODE_DPMS_OFF);
212}
213
214static void pch_disable_crt(struct intel_atomic_state *state,
215 struct intel_encoder *encoder,
216 const struct intel_crtc_state *old_crtc_state,
217 const struct drm_connector_state *old_conn_state)
218{
219}
220
221static void pch_post_disable_crt(struct intel_atomic_state *state,
222 struct intel_encoder *encoder,
223 const struct intel_crtc_state *old_crtc_state,
224 const struct drm_connector_state *old_conn_state)
225{
226 intel_disable_crt(state, encoder, old_crtc_state, old_conn_state);
227}
228
229static void hsw_disable_crt(struct intel_atomic_state *state,
230 struct intel_encoder *encoder,
231 const struct intel_crtc_state *old_crtc_state,
232 const struct drm_connector_state *old_conn_state)
233{
234 struct drm_i915_private *dev_priv = to_i915(encoder->base.dev);
235
236 drm_WARN_ON(&dev_priv->drm, !old_crtc_state->has_pch_encoder);
237
238 intel_set_pch_fifo_underrun_reporting(dev_priv, PIPE_A, false);
239}
240
241static void hsw_post_disable_crt(struct intel_atomic_state *state,
242 struct intel_encoder *encoder,
243 const struct intel_crtc_state *old_crtc_state,
244 const struct drm_connector_state *old_conn_state)
245{
246 struct drm_i915_private *dev_priv = to_i915(encoder->base.dev);
247
248 intel_crtc_vblank_off(old_crtc_state);
249
250 intel_disable_pipe(old_crtc_state);
251
252 intel_ddi_disable_transcoder_func(old_crtc_state);
253
254 ilk_pfit_disable(old_crtc_state);
255
256 intel_ddi_disable_pipe_clock(old_crtc_state);
257
258 pch_post_disable_crt(state, encoder, old_crtc_state, old_conn_state);
259
260 lpt_disable_pch_transcoder(dev_priv);
261 lpt_disable_iclkip(dev_priv);
262
263 intel_ddi_fdi_post_disable(state, encoder, old_crtc_state, old_conn_state);
264
265 drm_WARN_ON(&dev_priv->drm, !old_crtc_state->has_pch_encoder);
266
267 intel_set_pch_fifo_underrun_reporting(dev_priv, PIPE_A, true);
268}
269
270static void hsw_pre_pll_enable_crt(struct intel_atomic_state *state,
271 struct intel_encoder *encoder,
272 const struct intel_crtc_state *crtc_state,
273 const struct drm_connector_state *conn_state)
274{
275 struct drm_i915_private *dev_priv = to_i915(encoder->base.dev);
276
277 drm_WARN_ON(&dev_priv->drm, !crtc_state->has_pch_encoder);
278
279 intel_set_pch_fifo_underrun_reporting(dev_priv, PIPE_A, false);
280}
281
282static void hsw_pre_enable_crt(struct intel_atomic_state *state,
283 struct intel_encoder *encoder,
284 const struct intel_crtc_state *crtc_state,
285 const struct drm_connector_state *conn_state)
286{
287 struct drm_i915_private *dev_priv = to_i915(encoder->base.dev);
288 struct intel_crtc *crtc = to_intel_crtc(crtc_state->uapi.crtc);
289 enum pipe pipe = crtc->pipe;
290
291 drm_WARN_ON(&dev_priv->drm, !crtc_state->has_pch_encoder);
292
293 intel_set_cpu_fifo_underrun_reporting(dev_priv, pipe, false);
294
295 hsw_fdi_link_train(encoder, crtc_state);
296
297 intel_ddi_enable_pipe_clock(encoder, crtc_state);
298}
299
300static void hsw_enable_crt(struct intel_atomic_state *state,
301 struct intel_encoder *encoder,
302 const struct intel_crtc_state *crtc_state,
303 const struct drm_connector_state *conn_state)
304{
305 struct drm_i915_private *dev_priv = to_i915(encoder->base.dev);
306 struct intel_crtc *crtc = to_intel_crtc(crtc_state->uapi.crtc);
307 enum pipe pipe = crtc->pipe;
308
309 drm_WARN_ON(&dev_priv->drm, !crtc_state->has_pch_encoder);
310
311 intel_ddi_enable_transcoder_func(encoder, crtc_state);
312
313 intel_enable_pipe(crtc_state);
314
315 lpt_pch_enable(crtc_state);
316
317 intel_crtc_vblank_on(crtc_state);
318
319 intel_crt_set_dpms(encoder, crtc_state, DRM_MODE_DPMS_ON);
320
321 intel_wait_for_vblank(dev_priv, pipe);
322 intel_wait_for_vblank(dev_priv, pipe);
323 intel_set_cpu_fifo_underrun_reporting(dev_priv, pipe, true);
324 intel_set_pch_fifo_underrun_reporting(dev_priv, PIPE_A, true);
325}
326
327static void intel_enable_crt(struct intel_atomic_state *state,
328 struct intel_encoder *encoder,
329 const struct intel_crtc_state *crtc_state,
330 const struct drm_connector_state *conn_state)
331{
332 intel_crt_set_dpms(encoder, crtc_state, DRM_MODE_DPMS_ON);
333}
334
335static enum drm_mode_status
336intel_crt_mode_valid(struct drm_connector *connector,
337 struct drm_display_mode *mode)
338{
339 struct drm_device *dev = connector->dev;
340 struct drm_i915_private *dev_priv = to_i915(dev);
341 int max_dotclk = dev_priv->max_dotclk_freq;
342 int max_clock;
343
344 if (mode->flags & DRM_MODE_FLAG_DBLSCAN)
345 return MODE_NO_DBLESCAN;
346
347 if (mode->clock < 25000)
348 return MODE_CLOCK_LOW;
349
350 if (HAS_PCH_LPT(dev_priv))
351 max_clock = 180000;
352 else if (IS_VALLEYVIEW(dev_priv))
353 /*
354 * 270 MHz due to current DPLL limits,
355 * DAC limit supposedly 355 MHz.
356 */
357 max_clock = 270000;
358 else if (IS_GEN_RANGE(dev_priv, 3, 4))
359 max_clock = 400000;
360 else
361 max_clock = 350000;
362 if (mode->clock > max_clock)
363 return MODE_CLOCK_HIGH;
364
365 if (mode->clock > max_dotclk)
366 return MODE_CLOCK_HIGH;
367
368 /* The FDI receiver on LPT only supports 8bpc and only has 2 lanes. */
369 if (HAS_PCH_LPT(dev_priv) &&
370 ilk_get_lanes_required(mode->clock, 270000, 24) > 2)
371 return MODE_CLOCK_HIGH;
372
373 /* HSW/BDW FDI limited to 4k */
374 if (mode->hdisplay > 4096)
375 return MODE_H_ILLEGAL;
376
377 return MODE_OK;
378}
379
380static int intel_crt_compute_config(struct intel_encoder *encoder,
381 struct intel_crtc_state *pipe_config,
382 struct drm_connector_state *conn_state)
383{
384 struct drm_display_mode *adjusted_mode =
385 &pipe_config->hw.adjusted_mode;
386
387 if (adjusted_mode->flags & DRM_MODE_FLAG_DBLSCAN)
388 return -EINVAL;
389
390 pipe_config->output_format = INTEL_OUTPUT_FORMAT_RGB;
391
392 return 0;
393}
394
395static int pch_crt_compute_config(struct intel_encoder *encoder,
396 struct intel_crtc_state *pipe_config,
397 struct drm_connector_state *conn_state)
398{
399 struct drm_display_mode *adjusted_mode =
400 &pipe_config->hw.adjusted_mode;
401
402 if (adjusted_mode->flags & DRM_MODE_FLAG_DBLSCAN)
403 return -EINVAL;
404
405 pipe_config->has_pch_encoder = true;
406 pipe_config->output_format = INTEL_OUTPUT_FORMAT_RGB;
407
408 return 0;
409}
410
411static int hsw_crt_compute_config(struct intel_encoder *encoder,
412 struct intel_crtc_state *pipe_config,
413 struct drm_connector_state *conn_state)
414{
415 struct drm_i915_private *dev_priv = to_i915(encoder->base.dev);
416 struct drm_display_mode *adjusted_mode =
417 &pipe_config->hw.adjusted_mode;
418
419 if (adjusted_mode->flags & DRM_MODE_FLAG_DBLSCAN)
420 return -EINVAL;
421
422 /* HSW/BDW FDI limited to 4k */
423 if (adjusted_mode->crtc_hdisplay > 4096 ||
424 adjusted_mode->crtc_hblank_start > 4096)
425 return -EINVAL;
426
427 pipe_config->has_pch_encoder = true;
428 pipe_config->output_format = INTEL_OUTPUT_FORMAT_RGB;
429
430 /* LPT FDI RX only supports 8bpc. */
431 if (HAS_PCH_LPT(dev_priv)) {
432 if (pipe_config->bw_constrained && pipe_config->pipe_bpp < 24) {
433 drm_dbg_kms(&dev_priv->drm,
434 "LPT only supports 24bpp\n");
435 return -EINVAL;
436 }
437
438 pipe_config->pipe_bpp = 24;
439 }
440
441 /* FDI must always be 2.7 GHz */
442 pipe_config->port_clock = 135000 * 2;
443
444 return 0;
445}
446
447static bool ilk_crt_detect_hotplug(struct drm_connector *connector)
448{
449 struct drm_device *dev = connector->dev;
450 struct intel_crt *crt = intel_attached_crt(to_intel_connector(connector));
451 struct drm_i915_private *dev_priv = to_i915(dev);
452 u32 adpa;
453 bool ret;
454
455 /* The first time through, trigger an explicit detection cycle */
456 if (crt->force_hotplug_required) {
457 bool turn_off_dac = HAS_PCH_SPLIT(dev_priv);
458 u32 save_adpa;
459
460 crt->force_hotplug_required = false;
461
462 save_adpa = adpa = intel_de_read(dev_priv, crt->adpa_reg);
463 drm_dbg_kms(&dev_priv->drm,
464 "trigger hotplug detect cycle: adpa=0x%x\n", adpa);
465
466 adpa |= ADPA_CRT_HOTPLUG_FORCE_TRIGGER;
467 if (turn_off_dac)
468 adpa &= ~ADPA_DAC_ENABLE;
469
470 intel_de_write(dev_priv, crt->adpa_reg, adpa);
471
472 if (intel_de_wait_for_clear(dev_priv,
473 crt->adpa_reg,
474 ADPA_CRT_HOTPLUG_FORCE_TRIGGER,
475 1000))
476 drm_dbg_kms(&dev_priv->drm,
477 "timed out waiting for FORCE_TRIGGER");
478
479 if (turn_off_dac) {
480 intel_de_write(dev_priv, crt->adpa_reg, save_adpa);
481 intel_de_posting_read(dev_priv, crt->adpa_reg);
482 }
483 }
484
485 /* Check the status to see if both blue and green are on now */
486 adpa = intel_de_read(dev_priv, crt->adpa_reg);
487 if ((adpa & ADPA_CRT_HOTPLUG_MONITOR_MASK) != 0)
488 ret = true;
489 else
490 ret = false;
491 drm_dbg_kms(&dev_priv->drm, "ironlake hotplug adpa=0x%x, result %d\n",
492 adpa, ret);
493
494 return ret;
495}
496
497static bool valleyview_crt_detect_hotplug(struct drm_connector *connector)
498{
499 struct drm_device *dev = connector->dev;
500 struct intel_crt *crt = intel_attached_crt(to_intel_connector(connector));
501 struct drm_i915_private *dev_priv = to_i915(dev);
502 bool reenable_hpd;
503 u32 adpa;
504 bool ret;
505 u32 save_adpa;
506
507 /*
508 * Doing a force trigger causes a hpd interrupt to get sent, which can
509 * get us stuck in a loop if we're polling:
510 * - We enable power wells and reset the ADPA
511 * - output_poll_exec does force probe on VGA, triggering a hpd
512 * - HPD handler waits for poll to unlock dev->mode_config.mutex
513 * - output_poll_exec shuts off the ADPA, unlocks
514 * dev->mode_config.mutex
515 * - HPD handler runs, resets ADPA and brings us back to the start
516 *
517 * Just disable HPD interrupts here to prevent this
518 */
519 reenable_hpd = intel_hpd_disable(dev_priv, crt->base.hpd_pin);
520
521 save_adpa = adpa = intel_de_read(dev_priv, crt->adpa_reg);
522 drm_dbg_kms(&dev_priv->drm,
523 "trigger hotplug detect cycle: adpa=0x%x\n", adpa);
524
525 adpa |= ADPA_CRT_HOTPLUG_FORCE_TRIGGER;
526
527 intel_de_write(dev_priv, crt->adpa_reg, adpa);
528
529 if (intel_de_wait_for_clear(dev_priv, crt->adpa_reg,
530 ADPA_CRT_HOTPLUG_FORCE_TRIGGER, 1000)) {
531 drm_dbg_kms(&dev_priv->drm,
532 "timed out waiting for FORCE_TRIGGER");
533 intel_de_write(dev_priv, crt->adpa_reg, save_adpa);
534 }
535
536 /* Check the status to see if both blue and green are on now */
537 adpa = intel_de_read(dev_priv, crt->adpa_reg);
538 if ((adpa & ADPA_CRT_HOTPLUG_MONITOR_MASK) != 0)
539 ret = true;
540 else
541 ret = false;
542
543 drm_dbg_kms(&dev_priv->drm,
544 "valleyview hotplug adpa=0x%x, result %d\n", adpa, ret);
545
546 if (reenable_hpd)
547 intel_hpd_enable(dev_priv, crt->base.hpd_pin);
548
549 return ret;
550}
551
552static bool intel_crt_detect_hotplug(struct drm_connector *connector)
553{
554 struct drm_device *dev = connector->dev;
555 struct drm_i915_private *dev_priv = to_i915(dev);
556 u32 stat;
557 bool ret = false;
558 int i, tries = 0;
559
560 if (HAS_PCH_SPLIT(dev_priv))
561 return ilk_crt_detect_hotplug(connector);
562
563 if (IS_VALLEYVIEW(dev_priv))
564 return valleyview_crt_detect_hotplug(connector);
565
566 /*
567 * On 4 series desktop, CRT detect sequence need to be done twice
568 * to get a reliable result.
569 */
570
571 if (IS_G45(dev_priv))
572 tries = 2;
573 else
574 tries = 1;
575
576 for (i = 0; i < tries ; i++) {
577 /* turn on the FORCE_DETECT */
578 i915_hotplug_interrupt_update(dev_priv,
579 CRT_HOTPLUG_FORCE_DETECT,
580 CRT_HOTPLUG_FORCE_DETECT);
581 /* wait for FORCE_DETECT to go off */
582 if (intel_de_wait_for_clear(dev_priv, PORT_HOTPLUG_EN,
583 CRT_HOTPLUG_FORCE_DETECT, 1000))
584 drm_dbg_kms(&dev_priv->drm,
585 "timed out waiting for FORCE_DETECT to go off");
586 }
587
588 stat = intel_de_read(dev_priv, PORT_HOTPLUG_STAT);
589 if ((stat & CRT_HOTPLUG_MONITOR_MASK) != CRT_HOTPLUG_MONITOR_NONE)
590 ret = true;
591
592 /* clear the interrupt we just generated, if any */
593 intel_de_write(dev_priv, PORT_HOTPLUG_STAT, CRT_HOTPLUG_INT_STATUS);
594
595 i915_hotplug_interrupt_update(dev_priv, CRT_HOTPLUG_FORCE_DETECT, 0);
596
597 return ret;
598}
599
600static struct edid *intel_crt_get_edid(struct drm_connector *connector,
601 struct i2c_adapter *i2c)
602{
603 struct edid *edid;
604
605 edid = drm_get_edid(connector, i2c);
606
607 if (!edid && !intel_gmbus_is_forced_bit(i2c)) {
608 drm_dbg_kms(connector->dev,
609 "CRT GMBUS EDID read failed, retry using GPIO bit-banging\n");
610 intel_gmbus_force_bit(i2c, true);
611 edid = drm_get_edid(connector, i2c);
612 intel_gmbus_force_bit(i2c, false);
613 }
614
615 return edid;
616}
617
618/* local version of intel_ddc_get_modes() to use intel_crt_get_edid() */
619static int intel_crt_ddc_get_modes(struct drm_connector *connector,
620 struct i2c_adapter *adapter)
621{
622 struct edid *edid;
623 int ret;
624
625 edid = intel_crt_get_edid(connector, adapter);
626 if (!edid)
627 return 0;
628
629 ret = intel_connector_update_modes(connector, edid);
630 kfree(edid);
631
632 return ret;
633}
634
635static bool intel_crt_detect_ddc(struct drm_connector *connector)
636{
637 struct intel_crt *crt = intel_attached_crt(to_intel_connector(connector));
638 struct drm_i915_private *dev_priv = to_i915(crt->base.base.dev);
639 struct edid *edid;
640 struct i2c_adapter *i2c;
641 bool ret = false;
642
643 BUG_ON(crt->base.type != INTEL_OUTPUT_ANALOG);
644
645 i2c = intel_gmbus_get_adapter(dev_priv, dev_priv->vbt.crt_ddc_pin);
646 edid = intel_crt_get_edid(connector, i2c);
647
648 if (edid) {
649 bool is_digital = edid->input & DRM_EDID_INPUT_DIGITAL;
650
651 /*
652 * This may be a DVI-I connector with a shared DDC
653 * link between analog and digital outputs, so we
654 * have to check the EDID input spec of the attached device.
655 */
656 if (!is_digital) {
657 drm_dbg_kms(&dev_priv->drm,
658 "CRT detected via DDC:0x50 [EDID]\n");
659 ret = true;
660 } else {
661 drm_dbg_kms(&dev_priv->drm,
662 "CRT not detected via DDC:0x50 [EDID reports a digital panel]\n");
663 }
664 } else {
665 drm_dbg_kms(&dev_priv->drm,
666 "CRT not detected via DDC:0x50 [no valid EDID found]\n");
667 }
668
669 kfree(edid);
670
671 return ret;
672}
673
674static enum drm_connector_status
675intel_crt_load_detect(struct intel_crt *crt, u32 pipe)
676{
677 struct drm_device *dev = crt->base.base.dev;
678 struct drm_i915_private *dev_priv = to_i915(dev);
679 struct intel_uncore *uncore = &dev_priv->uncore;
680 u32 save_bclrpat;
681 u32 save_vtotal;
682 u32 vtotal, vactive;
683 u32 vsample;
684 u32 vblank, vblank_start, vblank_end;
685 u32 dsl;
686 i915_reg_t bclrpat_reg, vtotal_reg,
687 vblank_reg, vsync_reg, pipeconf_reg, pipe_dsl_reg;
688 u8 st00;
689 enum drm_connector_status status;
690
691 drm_dbg_kms(&dev_priv->drm, "starting load-detect on CRT\n");
692
693 bclrpat_reg = BCLRPAT(pipe);
694 vtotal_reg = VTOTAL(pipe);
695 vblank_reg = VBLANK(pipe);
696 vsync_reg = VSYNC(pipe);
697 pipeconf_reg = PIPECONF(pipe);
698 pipe_dsl_reg = PIPEDSL(pipe);
699
700 save_bclrpat = intel_uncore_read(uncore, bclrpat_reg);
701 save_vtotal = intel_uncore_read(uncore, vtotal_reg);
702 vblank = intel_uncore_read(uncore, vblank_reg);
703
704 vtotal = ((save_vtotal >> 16) & 0xfff) + 1;
705 vactive = (save_vtotal & 0x7ff) + 1;
706
707 vblank_start = (vblank & 0xfff) + 1;
708 vblank_end = ((vblank >> 16) & 0xfff) + 1;
709
710 /* Set the border color to purple. */
711 intel_uncore_write(uncore, bclrpat_reg, 0x500050);
712
713 if (!IS_GEN(dev_priv, 2)) {
714 u32 pipeconf = intel_uncore_read(uncore, pipeconf_reg);
715 intel_uncore_write(uncore,
716 pipeconf_reg,
717 pipeconf | PIPECONF_FORCE_BORDER);
718 intel_uncore_posting_read(uncore, pipeconf_reg);
719 /* Wait for next Vblank to substitue
720 * border color for Color info */
721 intel_wait_for_vblank(dev_priv, pipe);
722 st00 = intel_uncore_read8(uncore, _VGA_MSR_WRITE);
723 status = ((st00 & (1 << 4)) != 0) ?
724 connector_status_connected :
725 connector_status_disconnected;
726
727 intel_uncore_write(uncore, pipeconf_reg, pipeconf);
728 } else {
729 bool restore_vblank = false;
730 int count, detect;
731
732 /*
733 * If there isn't any border, add some.
734 * Yes, this will flicker
735 */
736 if (vblank_start <= vactive && vblank_end >= vtotal) {
737 u32 vsync = intel_de_read(dev_priv, vsync_reg);
738 u32 vsync_start = (vsync & 0xffff) + 1;
739
740 vblank_start = vsync_start;
741 intel_uncore_write(uncore,
742 vblank_reg,
743 (vblank_start - 1) |
744 ((vblank_end - 1) << 16));
745 restore_vblank = true;
746 }
747 /* sample in the vertical border, selecting the larger one */
748 if (vblank_start - vactive >= vtotal - vblank_end)
749 vsample = (vblank_start + vactive) >> 1;
750 else
751 vsample = (vtotal + vblank_end) >> 1;
752
753 /*
754 * Wait for the border to be displayed
755 */
756 while (intel_uncore_read(uncore, pipe_dsl_reg) >= vactive)
757 ;
758 while ((dsl = intel_uncore_read(uncore, pipe_dsl_reg)) <=
759 vsample)
760 ;
761 /*
762 * Watch ST00 for an entire scanline
763 */
764 detect = 0;
765 count = 0;
766 do {
767 count++;
768 /* Read the ST00 VGA status register */
769 st00 = intel_uncore_read8(uncore, _VGA_MSR_WRITE);
770 if (st00 & (1 << 4))
771 detect++;
772 } while ((intel_uncore_read(uncore, pipe_dsl_reg) == dsl));
773
774 /* restore vblank if necessary */
775 if (restore_vblank)
776 intel_uncore_write(uncore, vblank_reg, vblank);
777 /*
778 * If more than 3/4 of the scanline detected a monitor,
779 * then it is assumed to be present. This works even on i830,
780 * where there isn't any way to force the border color across
781 * the screen
782 */
783 status = detect * 4 > count * 3 ?
784 connector_status_connected :
785 connector_status_disconnected;
786 }
787
788 /* Restore previous settings */
789 intel_uncore_write(uncore, bclrpat_reg, save_bclrpat);
790
791 return status;
792}
793
794static int intel_spurious_crt_detect_dmi_callback(const struct dmi_system_id *id)
795{
796 DRM_DEBUG_DRIVER("Skipping CRT detection for %s\n", id->ident);
797 return 1;
798}
799
800static const struct dmi_system_id intel_spurious_crt_detect[] = {
801 {
802 .callback = intel_spurious_crt_detect_dmi_callback,
803 .ident = "ACER ZGB",
804 .matches = {
805 DMI_MATCH(DMI_SYS_VENDOR, "ACER"),
806 DMI_MATCH(DMI_PRODUCT_NAME, "ZGB"),
807 },
808 },
809 {
810 .callback = intel_spurious_crt_detect_dmi_callback,
811 .ident = "Intel DZ77BH-55K",
812 .matches = {
813 DMI_MATCH(DMI_BOARD_VENDOR, "Intel Corporation"),
814 DMI_MATCH(DMI_BOARD_NAME, "DZ77BH-55K"),
815 },
816 },
817 { }
818};
819
820static int
821intel_crt_detect(struct drm_connector *connector,
822 struct drm_modeset_acquire_ctx *ctx,
823 bool force)
824{
825 struct drm_i915_private *dev_priv = to_i915(connector->dev);
826 struct intel_crt *crt = intel_attached_crt(to_intel_connector(connector));
827 struct intel_encoder *intel_encoder = &crt->base;
828 intel_wakeref_t wakeref;
829 int status, ret;
830 struct intel_load_detect_pipe tmp;
831
832 drm_dbg_kms(&dev_priv->drm, "[CONNECTOR:%d:%s] force=%d\n",
833 connector->base.id, connector->name,
834 force);
835
836 if (dev_priv->params.load_detect_test) {
837 wakeref = intel_display_power_get(dev_priv,
838 intel_encoder->power_domain);
839 goto load_detect;
840 }
841
842 /* Skip machines without VGA that falsely report hotplug events */
843 if (dmi_check_system(intel_spurious_crt_detect))
844 return connector_status_disconnected;
845
846 wakeref = intel_display_power_get(dev_priv,
847 intel_encoder->power_domain);
848
849 if (I915_HAS_HOTPLUG(dev_priv)) {
850 /* We can not rely on the HPD pin always being correctly wired
851 * up, for example many KVM do not pass it through, and so
852 * only trust an assertion that the monitor is connected.
853 */
854 if (intel_crt_detect_hotplug(connector)) {
855 drm_dbg_kms(&dev_priv->drm,
856 "CRT detected via hotplug\n");
857 status = connector_status_connected;
858 goto out;
859 } else
860 drm_dbg_kms(&dev_priv->drm,
861 "CRT not detected via hotplug\n");
862 }
863
864 if (intel_crt_detect_ddc(connector)) {
865 status = connector_status_connected;
866 goto out;
867 }
868
869 /* Load detection is broken on HPD capable machines. Whoever wants a
870 * broken monitor (without edid) to work behind a broken kvm (that fails
871 * to have the right resistors for HP detection) needs to fix this up.
872 * For now just bail out. */
873 if (I915_HAS_HOTPLUG(dev_priv)) {
874 status = connector_status_disconnected;
875 goto out;
876 }
877
878load_detect:
879 if (!force) {
880 status = connector->status;
881 goto out;
882 }
883
884 /* for pre-945g platforms use load detect */
885 ret = intel_get_load_detect_pipe(connector, &tmp, ctx);
886 if (ret > 0) {
887 if (intel_crt_detect_ddc(connector))
888 status = connector_status_connected;
889 else if (INTEL_GEN(dev_priv) < 4)
890 status = intel_crt_load_detect(crt,
891 to_intel_crtc(connector->state->crtc)->pipe);
892 else if (dev_priv->params.load_detect_test)
893 status = connector_status_disconnected;
894 else
895 status = connector_status_unknown;
896 intel_release_load_detect_pipe(connector, &tmp, ctx);
897 } else if (ret == 0) {
898 status = connector_status_unknown;
899 } else {
900 status = ret;
901 }
902
903out:
904 intel_display_power_put(dev_priv, intel_encoder->power_domain, wakeref);
905
906 /*
907 * Make sure the refs for power wells enabled during detect are
908 * dropped to avoid a new detect cycle triggered by HPD polling.
909 */
910 intel_display_power_flush_work(dev_priv);
911
912 return status;
913}
914
915static int intel_crt_get_modes(struct drm_connector *connector)
916{
917 struct drm_device *dev = connector->dev;
918 struct drm_i915_private *dev_priv = to_i915(dev);
919 struct intel_crt *crt = intel_attached_crt(to_intel_connector(connector));
920 struct intel_encoder *intel_encoder = &crt->base;
921 intel_wakeref_t wakeref;
922 struct i2c_adapter *i2c;
923 int ret;
924
925 wakeref = intel_display_power_get(dev_priv,
926 intel_encoder->power_domain);
927
928 i2c = intel_gmbus_get_adapter(dev_priv, dev_priv->vbt.crt_ddc_pin);
929 ret = intel_crt_ddc_get_modes(connector, i2c);
930 if (ret || !IS_G4X(dev_priv))
931 goto out;
932
933 /* Try to probe digital port for output in DVI-I -> VGA mode. */
934 i2c = intel_gmbus_get_adapter(dev_priv, GMBUS_PIN_DPB);
935 ret = intel_crt_ddc_get_modes(connector, i2c);
936
937out:
938 intel_display_power_put(dev_priv, intel_encoder->power_domain, wakeref);
939
940 return ret;
941}
942
943void intel_crt_reset(struct drm_encoder *encoder)
944{
945 struct drm_i915_private *dev_priv = to_i915(encoder->dev);
946 struct intel_crt *crt = intel_encoder_to_crt(to_intel_encoder(encoder));
947
948 if (INTEL_GEN(dev_priv) >= 5) {
949 u32 adpa;
950
951 adpa = intel_de_read(dev_priv, crt->adpa_reg);
952 adpa &= ~ADPA_CRT_HOTPLUG_MASK;
953 adpa |= ADPA_HOTPLUG_BITS;
954 intel_de_write(dev_priv, crt->adpa_reg, adpa);
955 intel_de_posting_read(dev_priv, crt->adpa_reg);
956
957 drm_dbg_kms(&dev_priv->drm, "crt adpa set to 0x%x\n", adpa);
958 crt->force_hotplug_required = true;
959 }
960
961}
962
963/*
964 * Routines for controlling stuff on the analog port
965 */
966
967static const struct drm_connector_funcs intel_crt_connector_funcs = {
968 .fill_modes = drm_helper_probe_single_connector_modes,
969 .late_register = intel_connector_register,
970 .early_unregister = intel_connector_unregister,
971 .destroy = intel_connector_destroy,
972 .atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
973 .atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
974};
975
976static const struct drm_connector_helper_funcs intel_crt_connector_helper_funcs = {
977 .detect_ctx = intel_crt_detect,
978 .mode_valid = intel_crt_mode_valid,
979 .get_modes = intel_crt_get_modes,
980};
981
982static const struct drm_encoder_funcs intel_crt_enc_funcs = {
983 .reset = intel_crt_reset,
984 .destroy = intel_encoder_destroy,
985};
986
987void intel_crt_init(struct drm_i915_private *dev_priv)
988{
989 struct drm_connector *connector;
990 struct intel_crt *crt;
991 struct intel_connector *intel_connector;
992 i915_reg_t adpa_reg;
993 u32 adpa;
994
995 if (HAS_PCH_SPLIT(dev_priv))
996 adpa_reg = PCH_ADPA;
997 else if (IS_VALLEYVIEW(dev_priv))
998 adpa_reg = VLV_ADPA;
999 else
1000 adpa_reg = ADPA;
1001
1002 adpa = intel_de_read(dev_priv, adpa_reg);
1003 if ((adpa & ADPA_DAC_ENABLE) == 0) {
1004 /*
1005 * On some machines (some IVB at least) CRT can be
1006 * fused off, but there's no known fuse bit to
1007 * indicate that. On these machine the ADPA register
1008 * works normally, except the DAC enable bit won't
1009 * take. So the only way to tell is attempt to enable
1010 * it and see what happens.
1011 */
1012 intel_de_write(dev_priv, adpa_reg,
1013 adpa | ADPA_DAC_ENABLE | ADPA_HSYNC_CNTL_DISABLE | ADPA_VSYNC_CNTL_DISABLE);
1014 if ((intel_de_read(dev_priv, adpa_reg) & ADPA_DAC_ENABLE) == 0)
1015 return;
1016 intel_de_write(dev_priv, adpa_reg, adpa);
1017 }
1018
1019 crt = kzalloc(sizeof(struct intel_crt), GFP_KERNEL);
1020 if (!crt)
1021 return;
1022
1023 intel_connector = intel_connector_alloc();
1024 if (!intel_connector) {
1025 kfree(crt);
1026 return;
1027 }
1028
1029 connector = &intel_connector->base;
1030 crt->connector = intel_connector;
1031 drm_connector_init(&dev_priv->drm, &intel_connector->base,
1032 &intel_crt_connector_funcs, DRM_MODE_CONNECTOR_VGA);
1033
1034 drm_encoder_init(&dev_priv->drm, &crt->base.base, &intel_crt_enc_funcs,
1035 DRM_MODE_ENCODER_DAC, "CRT");
1036
1037 intel_connector_attach_encoder(intel_connector, &crt->base);
1038
1039 crt->base.type = INTEL_OUTPUT_ANALOG;
1040 crt->base.cloneable = (1 << INTEL_OUTPUT_DVO) | (1 << INTEL_OUTPUT_HDMI);
1041 if (IS_I830(dev_priv))
1042 crt->base.pipe_mask = BIT(PIPE_A);
1043 else
1044 crt->base.pipe_mask = ~0;
1045
1046 if (IS_GEN(dev_priv, 2))
1047 connector->interlace_allowed = 0;
1048 else
1049 connector->interlace_allowed = 1;
1050 connector->doublescan_allowed = 0;
1051
1052 crt->adpa_reg = adpa_reg;
1053
1054 crt->base.power_domain = POWER_DOMAIN_PORT_CRT;
1055
1056 if (I915_HAS_HOTPLUG(dev_priv) &&
1057 !dmi_check_system(intel_spurious_crt_detect)) {
1058 crt->base.hpd_pin = HPD_CRT;
1059 crt->base.hotplug = intel_encoder_hotplug;
1060 intel_connector->polled = DRM_CONNECTOR_POLL_HPD;
1061 } else {
1062 intel_connector->polled = DRM_CONNECTOR_POLL_CONNECT;
1063 }
1064
1065 if (HAS_DDI(dev_priv)) {
1066 crt->base.port = PORT_E;
1067 crt->base.get_config = hsw_crt_get_config;
1068 crt->base.get_hw_state = intel_ddi_get_hw_state;
1069 crt->base.compute_config = hsw_crt_compute_config;
1070 crt->base.pre_pll_enable = hsw_pre_pll_enable_crt;
1071 crt->base.pre_enable = hsw_pre_enable_crt;
1072 crt->base.enable = hsw_enable_crt;
1073 crt->base.disable = hsw_disable_crt;
1074 crt->base.post_disable = hsw_post_disable_crt;
1075 } else {
1076 if (HAS_PCH_SPLIT(dev_priv)) {
1077 crt->base.compute_config = pch_crt_compute_config;
1078 crt->base.disable = pch_disable_crt;
1079 crt->base.post_disable = pch_post_disable_crt;
1080 } else {
1081 crt->base.compute_config = intel_crt_compute_config;
1082 crt->base.disable = intel_disable_crt;
1083 }
1084 crt->base.port = PORT_NONE;
1085 crt->base.get_config = intel_crt_get_config;
1086 crt->base.get_hw_state = intel_crt_get_hw_state;
1087 crt->base.enable = intel_enable_crt;
1088 }
1089 intel_connector->get_hw_state = intel_connector_get_hw_state;
1090
1091 drm_connector_helper_add(connector, &intel_crt_connector_helper_funcs);
1092
1093 /*
1094 * TODO: find a proper way to discover whether we need to set the the
1095 * polarity and link reversal bits or not, instead of relying on the
1096 * BIOS.
1097 */
1098 if (HAS_PCH_LPT(dev_priv)) {
1099 u32 fdi_config = FDI_RX_POLARITY_REVERSED_LPT |
1100 FDI_RX_LINK_REVERSAL_OVERRIDE;
1101
1102 dev_priv->fdi_rx_config = intel_de_read(dev_priv,
1103 FDI_RX_CTL(PIPE_A)) & fdi_config;
1104 }
1105
1106 intel_crt_reset(&crt->base.base);
1107}