drm/i915: fix VGA detect on IGDNG
[linux-2.6.git] / drivers / gpu / drm / i915 / intel_crt.c
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/i2c.h>
28 #include "drmP.h"
29 #include "drm.h"
30 #include "drm_crtc.h"
31 #include "drm_crtc_helper.h"
32 #include "intel_drv.h"
33 #include "i915_drm.h"
34 #include "i915_drv.h"
35
36 static void intel_crt_dpms(struct drm_encoder *encoder, int mode)
37 {
38         struct drm_device *dev = encoder->dev;
39         struct drm_i915_private *dev_priv = dev->dev_private;
40         u32 temp, reg;
41
42         if (IS_IGDNG(dev))
43                 reg = PCH_ADPA;
44         else
45                 reg = ADPA;
46
47         temp = I915_READ(reg);
48         temp &= ~(ADPA_HSYNC_CNTL_DISABLE | ADPA_VSYNC_CNTL_DISABLE);
49         temp &= ~ADPA_DAC_ENABLE;
50
51         switch(mode) {
52         case DRM_MODE_DPMS_ON:
53                 temp |= ADPA_DAC_ENABLE;
54                 break;
55         case DRM_MODE_DPMS_STANDBY:
56                 temp |= ADPA_DAC_ENABLE | ADPA_HSYNC_CNTL_DISABLE;
57                 break;
58         case DRM_MODE_DPMS_SUSPEND:
59                 temp |= ADPA_DAC_ENABLE | ADPA_VSYNC_CNTL_DISABLE;
60                 break;
61         case DRM_MODE_DPMS_OFF:
62                 temp |= ADPA_HSYNC_CNTL_DISABLE | ADPA_VSYNC_CNTL_DISABLE;
63                 break;
64         }
65
66         I915_WRITE(reg, temp);
67 }
68
69 static int intel_crt_mode_valid(struct drm_connector *connector,
70                                 struct drm_display_mode *mode)
71 {
72         struct drm_device *dev = connector->dev;
73
74         int max_clock = 0;
75         if (mode->flags & DRM_MODE_FLAG_DBLSCAN)
76                 return MODE_NO_DBLESCAN;
77
78         if (mode->clock < 25000)
79                 return MODE_CLOCK_LOW;
80
81         if (!IS_I9XX(dev))
82                 max_clock = 350000;
83         else
84                 max_clock = 400000;
85         if (mode->clock > max_clock)
86                 return MODE_CLOCK_HIGH;
87
88         return MODE_OK;
89 }
90
91 static bool intel_crt_mode_fixup(struct drm_encoder *encoder,
92                                  struct drm_display_mode *mode,
93                                  struct drm_display_mode *adjusted_mode)
94 {
95         return true;
96 }
97
98 static void intel_crt_mode_set(struct drm_encoder *encoder,
99                                struct drm_display_mode *mode,
100                                struct drm_display_mode *adjusted_mode)
101 {
102
103         struct drm_device *dev = encoder->dev;
104         struct drm_crtc *crtc = encoder->crtc;
105         struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
106         struct drm_i915_private *dev_priv = dev->dev_private;
107         int dpll_md_reg;
108         u32 adpa, dpll_md;
109         u32 adpa_reg;
110
111         if (intel_crtc->pipe == 0)
112                 dpll_md_reg = DPLL_A_MD;
113         else
114                 dpll_md_reg = DPLL_B_MD;
115
116         if (IS_IGDNG(dev))
117                 adpa_reg = PCH_ADPA;
118         else
119                 adpa_reg = ADPA;
120
121         /*
122          * Disable separate mode multiplier used when cloning SDVO to CRT
123          * XXX this needs to be adjusted when we really are cloning
124          */
125         if (IS_I965G(dev) && !IS_IGDNG(dev)) {
126                 dpll_md = I915_READ(dpll_md_reg);
127                 I915_WRITE(dpll_md_reg,
128                            dpll_md & ~DPLL_MD_UDI_MULTIPLIER_MASK);
129         }
130
131         adpa = 0;
132         if (adjusted_mode->flags & DRM_MODE_FLAG_PHSYNC)
133                 adpa |= ADPA_HSYNC_ACTIVE_HIGH;
134         if (adjusted_mode->flags & DRM_MODE_FLAG_PVSYNC)
135                 adpa |= ADPA_VSYNC_ACTIVE_HIGH;
136
137         if (intel_crtc->pipe == 0) {
138                 adpa |= ADPA_PIPE_A_SELECT;
139                 if (!IS_IGDNG(dev))
140                         I915_WRITE(BCLRPAT_A, 0);
141         } else {
142                 adpa |= ADPA_PIPE_B_SELECT;
143                 if (!IS_IGDNG(dev))
144                         I915_WRITE(BCLRPAT_B, 0);
145         }
146
147         I915_WRITE(adpa_reg, adpa);
148 }
149
150 static bool intel_igdng_crt_detect_hotplug(struct drm_connector *connector)
151 {
152         struct drm_device *dev = connector->dev;
153         struct drm_i915_private *dev_priv = dev->dev_private;
154         u32 adpa, temp;
155         bool ret;
156
157         temp = adpa = I915_READ(PCH_ADPA);
158
159         adpa &= ~ADPA_DAC_ENABLE;
160         I915_WRITE(PCH_ADPA, adpa);
161
162         adpa &= ~ADPA_CRT_HOTPLUG_MASK;
163
164         adpa |= (ADPA_CRT_HOTPLUG_PERIOD_128 |
165                         ADPA_CRT_HOTPLUG_WARMUP_10MS |
166                         ADPA_CRT_HOTPLUG_SAMPLE_4S |
167                         ADPA_CRT_HOTPLUG_VOLTAGE_50 | /* default */
168                         ADPA_CRT_HOTPLUG_VOLREF_325MV |
169                         ADPA_CRT_HOTPLUG_ENABLE |
170                         ADPA_CRT_HOTPLUG_FORCE_TRIGGER);
171
172         DRM_DEBUG("pch crt adpa 0x%x", adpa);
173         I915_WRITE(PCH_ADPA, adpa);
174
175         while ((I915_READ(PCH_ADPA) & ADPA_CRT_HOTPLUG_FORCE_TRIGGER) != 0)
176                 ;
177
178         /* Check the status to see if both blue and green are on now */
179         adpa = I915_READ(PCH_ADPA);
180         adpa &= ADPA_CRT_HOTPLUG_MONITOR_MASK;
181         if ((adpa == ADPA_CRT_HOTPLUG_MONITOR_COLOR) ||
182                 (adpa == ADPA_CRT_HOTPLUG_MONITOR_MONO))
183                 ret = true;
184         else
185                 ret = false;
186
187         /* restore origin register */
188         I915_WRITE(PCH_ADPA, temp);
189         return ret;
190 }
191
192 /**
193  * Uses CRT_HOTPLUG_EN and CRT_HOTPLUG_STAT to detect CRT presence.
194  *
195  * Not for i915G/i915GM
196  *
197  * \return true if CRT is connected.
198  * \return false if CRT is disconnected.
199  */
200 static bool intel_crt_detect_hotplug(struct drm_connector *connector)
201 {
202         struct drm_device *dev = connector->dev;
203         struct drm_i915_private *dev_priv = dev->dev_private;
204         u32 hotplug_en;
205         int i, tries = 0;
206
207         if (IS_IGDNG(dev))
208                 return intel_igdng_crt_detect_hotplug(connector);
209
210         /*
211          * On 4 series desktop, CRT detect sequence need to be done twice
212          * to get a reliable result.
213          */
214
215         if (IS_G4X(dev) && !IS_GM45(dev))
216                 tries = 2;
217         else
218                 tries = 1;
219         hotplug_en = I915_READ(PORT_HOTPLUG_EN);
220         hotplug_en &= CRT_FORCE_HOTPLUG_MASK;
221         hotplug_en |= CRT_HOTPLUG_FORCE_DETECT;
222
223         if (IS_G4X(dev))
224                 hotplug_en |= CRT_HOTPLUG_ACTIVATION_PERIOD_64;
225
226         hotplug_en |= CRT_HOTPLUG_VOLTAGE_COMPARE_50;
227
228         for (i = 0; i < tries ; i++) {
229                 unsigned long timeout;
230                 /* turn on the FORCE_DETECT */
231                 I915_WRITE(PORT_HOTPLUG_EN, hotplug_en);
232                 timeout = jiffies + msecs_to_jiffies(1000);
233                 /* wait for FORCE_DETECT to go off */
234                 do {
235                         if (!(I915_READ(PORT_HOTPLUG_EN) &
236                                         CRT_HOTPLUG_FORCE_DETECT))
237                                 break;
238                         msleep(1);
239                 } while (time_after(timeout, jiffies));
240         }
241
242         if ((I915_READ(PORT_HOTPLUG_STAT) & CRT_HOTPLUG_MONITOR_MASK) ==
243             CRT_HOTPLUG_MONITOR_COLOR)
244                 return true;
245
246         return false;
247 }
248
249 static bool intel_crt_detect_ddc(struct drm_connector *connector)
250 {
251         struct intel_output *intel_output = to_intel_output(connector);
252
253         /* CRT should always be at 0, but check anyway */
254         if (intel_output->type != INTEL_OUTPUT_ANALOG)
255                 return false;
256
257         return intel_ddc_probe(intel_output);
258 }
259
260 static enum drm_connector_status
261 intel_crt_load_detect(struct drm_crtc *crtc, struct intel_output *intel_output)
262 {
263         struct drm_encoder *encoder = &intel_output->enc;
264         struct drm_device *dev = encoder->dev;
265         struct drm_i915_private *dev_priv = dev->dev_private;
266         struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
267         uint32_t pipe = intel_crtc->pipe;
268         uint32_t save_bclrpat;
269         uint32_t save_vtotal;
270         uint32_t vtotal, vactive;
271         uint32_t vsample;
272         uint32_t vblank, vblank_start, vblank_end;
273         uint32_t dsl;
274         uint32_t bclrpat_reg;
275         uint32_t vtotal_reg;
276         uint32_t vblank_reg;
277         uint32_t vsync_reg;
278         uint32_t pipeconf_reg;
279         uint32_t pipe_dsl_reg;
280         uint8_t st00;
281         enum drm_connector_status status;
282
283         if (pipe == 0) {
284                 bclrpat_reg = BCLRPAT_A;
285                 vtotal_reg = VTOTAL_A;
286                 vblank_reg = VBLANK_A;
287                 vsync_reg = VSYNC_A;
288                 pipeconf_reg = PIPEACONF;
289                 pipe_dsl_reg = PIPEADSL;
290         } else {
291                 bclrpat_reg = BCLRPAT_B;
292                 vtotal_reg = VTOTAL_B;
293                 vblank_reg = VBLANK_B;
294                 vsync_reg = VSYNC_B;
295                 pipeconf_reg = PIPEBCONF;
296                 pipe_dsl_reg = PIPEBDSL;
297         }
298
299         save_bclrpat = I915_READ(bclrpat_reg);
300         save_vtotal = I915_READ(vtotal_reg);
301         vblank = I915_READ(vblank_reg);
302
303         vtotal = ((save_vtotal >> 16) & 0xfff) + 1;
304         vactive = (save_vtotal & 0x7ff) + 1;
305
306         vblank_start = (vblank & 0xfff) + 1;
307         vblank_end = ((vblank >> 16) & 0xfff) + 1;
308
309         /* Set the border color to purple. */
310         I915_WRITE(bclrpat_reg, 0x500050);
311
312         if (IS_I9XX(dev)) {
313                 uint32_t pipeconf = I915_READ(pipeconf_reg);
314                 I915_WRITE(pipeconf_reg, pipeconf | PIPECONF_FORCE_BORDER);
315                 /* Wait for next Vblank to substitue
316                  * border color for Color info */
317                 intel_wait_for_vblank(dev);
318                 st00 = I915_READ8(VGA_MSR_WRITE);
319                 status = ((st00 & (1 << 4)) != 0) ?
320                         connector_status_connected :
321                         connector_status_disconnected;
322
323                 I915_WRITE(pipeconf_reg, pipeconf);
324         } else {
325                 bool restore_vblank = false;
326                 int count, detect;
327
328                 /*
329                 * If there isn't any border, add some.
330                 * Yes, this will flicker
331                 */
332                 if (vblank_start <= vactive && vblank_end >= vtotal) {
333                         uint32_t vsync = I915_READ(vsync_reg);
334                         uint32_t vsync_start = (vsync & 0xffff) + 1;
335
336                         vblank_start = vsync_start;
337                         I915_WRITE(vblank_reg,
338                                    (vblank_start - 1) |
339                                    ((vblank_end - 1) << 16));
340                         restore_vblank = true;
341                 }
342                 /* sample in the vertical border, selecting the larger one */
343                 if (vblank_start - vactive >= vtotal - vblank_end)
344                         vsample = (vblank_start + vactive) >> 1;
345                 else
346                         vsample = (vtotal + vblank_end) >> 1;
347
348                 /*
349                  * Wait for the border to be displayed
350                  */
351                 while (I915_READ(pipe_dsl_reg) >= vactive)
352                         ;
353                 while ((dsl = I915_READ(pipe_dsl_reg)) <= vsample)
354                         ;
355                 /*
356                  * Watch ST00 for an entire scanline
357                  */
358                 detect = 0;
359                 count = 0;
360                 do {
361                         count++;
362                         /* Read the ST00 VGA status register */
363                         st00 = I915_READ8(VGA_MSR_WRITE);
364                         if (st00 & (1 << 4))
365                                 detect++;
366                 } while ((I915_READ(pipe_dsl_reg) == dsl));
367
368                 /* restore vblank if necessary */
369                 if (restore_vblank)
370                         I915_WRITE(vblank_reg, vblank);
371                 /*
372                  * If more than 3/4 of the scanline detected a monitor,
373                  * then it is assumed to be present. This works even on i830,
374                  * where there isn't any way to force the border color across
375                  * the screen
376                  */
377                 status = detect * 4 > count * 3 ?
378                          connector_status_connected :
379                          connector_status_disconnected;
380         }
381
382         /* Restore previous settings */
383         I915_WRITE(bclrpat_reg, save_bclrpat);
384
385         return status;
386 }
387
388 static enum drm_connector_status intel_crt_detect(struct drm_connector *connector)
389 {
390         struct drm_device *dev = connector->dev;
391         struct intel_output *intel_output = to_intel_output(connector);
392         struct drm_encoder *encoder = &intel_output->enc;
393         struct drm_crtc *crtc;
394         int dpms_mode;
395         enum drm_connector_status status;
396
397         if (IS_I9XX(dev) && !IS_I915G(dev) && !IS_I915GM(dev)) {
398                 if (intel_crt_detect_hotplug(connector))
399                         return connector_status_connected;
400                 else
401                         return connector_status_disconnected;
402         }
403
404         if (intel_crt_detect_ddc(connector))
405                 return connector_status_connected;
406
407         /* for pre-945g platforms use load detect */
408         if (encoder->crtc && encoder->crtc->enabled) {
409                 status = intel_crt_load_detect(encoder->crtc, intel_output);
410         } else {
411                 crtc = intel_get_load_detect_pipe(intel_output,
412                                                   NULL, &dpms_mode);
413                 if (crtc) {
414                         status = intel_crt_load_detect(crtc, intel_output);
415                         intel_release_load_detect_pipe(intel_output, dpms_mode);
416                 } else
417                         status = connector_status_unknown;
418         }
419
420         return status;
421 }
422
423 static void intel_crt_destroy(struct drm_connector *connector)
424 {
425         struct intel_output *intel_output = to_intel_output(connector);
426
427         intel_i2c_destroy(intel_output->ddc_bus);
428         drm_sysfs_connector_remove(connector);
429         drm_connector_cleanup(connector);
430         kfree(connector);
431 }
432
433 static int intel_crt_get_modes(struct drm_connector *connector)
434 {
435         int ret;
436         struct intel_output *intel_output = to_intel_output(connector);
437         struct i2c_adapter *ddcbus;
438         struct drm_device *dev = connector->dev;
439
440
441         ret = intel_ddc_get_modes(intel_output);
442         if (ret || !IS_G4X(dev))
443                 goto end;
444
445         ddcbus = intel_output->ddc_bus;
446         /* Try to probe digital port for output in DVI-I -> VGA mode. */
447         intel_output->ddc_bus =
448                 intel_i2c_create(connector->dev, GPIOD, "CRTDDC_D");
449
450         if (!intel_output->ddc_bus) {
451                 intel_output->ddc_bus = ddcbus;
452                 dev_printk(KERN_ERR, &connector->dev->pdev->dev,
453                            "DDC bus registration failed for CRTDDC_D.\n");
454                 goto end;
455         }
456         /* Try to get modes by GPIOD port */
457         ret = intel_ddc_get_modes(intel_output);
458         intel_i2c_destroy(ddcbus);
459
460 end:
461         return ret;
462
463 }
464
465 static int intel_crt_set_property(struct drm_connector *connector,
466                                   struct drm_property *property,
467                                   uint64_t value)
468 {
469         return 0;
470 }
471
472 /*
473  * Routines for controlling stuff on the analog port
474  */
475
476 static const struct drm_encoder_helper_funcs intel_crt_helper_funcs = {
477         .dpms = intel_crt_dpms,
478         .mode_fixup = intel_crt_mode_fixup,
479         .prepare = intel_encoder_prepare,
480         .commit = intel_encoder_commit,
481         .mode_set = intel_crt_mode_set,
482 };
483
484 static const struct drm_connector_funcs intel_crt_connector_funcs = {
485         .dpms = drm_helper_connector_dpms,
486         .detect = intel_crt_detect,
487         .fill_modes = drm_helper_probe_single_connector_modes,
488         .destroy = intel_crt_destroy,
489         .set_property = intel_crt_set_property,
490 };
491
492 static const struct drm_connector_helper_funcs intel_crt_connector_helper_funcs = {
493         .mode_valid = intel_crt_mode_valid,
494         .get_modes = intel_crt_get_modes,
495         .best_encoder = intel_best_encoder,
496 };
497
498 static void intel_crt_enc_destroy(struct drm_encoder *encoder)
499 {
500         drm_encoder_cleanup(encoder);
501 }
502
503 static const struct drm_encoder_funcs intel_crt_enc_funcs = {
504         .destroy = intel_crt_enc_destroy,
505 };
506
507 void intel_crt_init(struct drm_device *dev)
508 {
509         struct drm_connector *connector;
510         struct intel_output *intel_output;
511         u32 i2c_reg;
512
513         intel_output = kzalloc(sizeof(struct intel_output), GFP_KERNEL);
514         if (!intel_output)
515                 return;
516
517         connector = &intel_output->base;
518         drm_connector_init(dev, &intel_output->base,
519                            &intel_crt_connector_funcs, DRM_MODE_CONNECTOR_VGA);
520
521         drm_encoder_init(dev, &intel_output->enc, &intel_crt_enc_funcs,
522                          DRM_MODE_ENCODER_DAC);
523
524         drm_mode_connector_attach_encoder(&intel_output->base,
525                                           &intel_output->enc);
526
527         /* Set up the DDC bus. */
528         if (IS_IGDNG(dev))
529                 i2c_reg = PCH_GPIOA;
530         else
531                 i2c_reg = GPIOA;
532         intel_output->ddc_bus = intel_i2c_create(dev, i2c_reg, "CRTDDC_A");
533         if (!intel_output->ddc_bus) {
534                 dev_printk(KERN_ERR, &dev->pdev->dev, "DDC bus registration "
535                            "failed.\n");
536                 return;
537         }
538
539         intel_output->type = INTEL_OUTPUT_ANALOG;
540         connector->interlace_allowed = 0;
541         connector->doublescan_allowed = 0;
542
543         drm_encoder_helper_add(&intel_output->enc, &intel_crt_helper_funcs);
544         drm_connector_helper_add(connector, &intel_crt_connector_helper_funcs);
545
546         drm_sysfs_connector_add(connector);
547 }