drivers/gpu/drm/i915/intel_dvo.c

   1 /*
   2  * Copyright 2006 Dave Airlie <airlied@linux.ie>
   3  * Copyright © 2006-2007 Intel Corporation
   4  *
   5  * Permission is hereby granted, free of charge, to any person obtaining a
   6  * copy of this software and associated documentation files (the "Software"),
   7  * to deal in the Software without restriction, including without limitation
   8  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
   9  * and/or sell copies of the Software, and to permit persons to whom the
  10  * Software is furnished to do so, subject to the following conditions:
  11  *
  12  * The above copyright notice and this permission notice (including the next
  13  * paragraph) shall be included in all copies or substantial portions of the
  14  * Software.
  15  *
  16  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  17  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  18  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  19  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  20  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
  21  * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
  22  * DEALINGS IN THE SOFTWARE.
  23  *
  24  * Authors:
  25  *      Eric Anholt <eric@anholt.net>
  26  */
  27 #include <linux/i2c.h>
  28 #include <linux/slab.h>
  29 #include <drm/drmP.h>
  30 #include <drm/drm_crtc.h>
  31 #include "intel_drv.h"
  32 #include <drm/i915_drm.h>
  33 #include "i915_drv.h"
  34 #include "dvo.h"
  35
  36 #define SIL164_ADDR     0x38
  37 #define CH7xxx_ADDR     0x76
  38 #define TFP410_ADDR     0x38
  39 #define NS2501_ADDR     0x38
  40
  41 static const struct intel_dvo_device intel_dvo_devices[] = {
  42         {
  43                 .type = INTEL_DVO_CHIP_TMDS,
  44                 .name = "sil164",
  45                 .dvo_reg = DVOC,
  46                 .slave_addr = SIL164_ADDR,
  47                 .dev_ops = &sil164_ops,
  48         },
  49         {
  50                 .type = INTEL_DVO_CHIP_TMDS,
  51                 .name = "ch7xxx",
  52                 .dvo_reg = DVOC,
  53                 .slave_addr = CH7xxx_ADDR,
  54                 .dev_ops = &ch7xxx_ops,
  55         },
  56         {
  57                 .type = INTEL_DVO_CHIP_TMDS,
  58                 .name = "ch7xxx",
  59                 .dvo_reg = DVOC,
  60                 .slave_addr = 0x75, /* For some ch7010 */
  61                 .dev_ops = &ch7xxx_ops,
  62         },
  63         {
  64                 .type = INTEL_DVO_CHIP_LVDS,
  65                 .name = "ivch",
  66                 .dvo_reg = DVOA,
  67                 .slave_addr = 0x02, /* Might also be 0x44, 0x84, 0xc4 */
  68                 .dev_ops = &ivch_ops,
  69         },
  70         {
  71                 .type = INTEL_DVO_CHIP_TMDS,
  72                 .name = "tfp410",
  73                 .dvo_reg = DVOC,
  74                 .slave_addr = TFP410_ADDR,
  75                 .dev_ops = &tfp410_ops,
  76         },
  77         {
  78                 .type = INTEL_DVO_CHIP_LVDS,
  79                 .name = "ch7017",
  80                 .dvo_reg = DVOC,
  81                 .slave_addr = 0x75,
  82                 .gpio = GMBUS_PORT_DPB,
  83                 .dev_ops = &ch7017_ops,
  84         },
  85         {
  86                 .type = INTEL_DVO_CHIP_TMDS,
  87                 .name = "ns2501",
  88                 .dvo_reg = DVOC,
  89                 .slave_addr = NS2501_ADDR,
  90                 .dev_ops = &ns2501_ops,
  91        }
  92 };
  93
  94 struct intel_dvo {
  95         struct intel_encoder base;
  96
  97         struct intel_dvo_device dev;
  98
  99         struct drm_display_mode *panel_fixed_mode;
 100         bool panel_wants_dither;
 101 };
 102
 103 static struct intel_dvo *enc_to_intel_dvo(struct drm_encoder *encoder)
 104 {
 105         return container_of(encoder, struct intel_dvo, base.base);
 106 }
 107
 108 static struct intel_dvo *intel_attached_dvo(struct drm_connector *connector)
 109 {
 110         return container_of(intel_attached_encoder(connector),
 111                             struct intel_dvo, base);
 112 }
 113
 114 static bool intel_dvo_connector_get_hw_state(struct intel_connector *connector)
 115 {
 116         struct intel_dvo *intel_dvo = intel_attached_dvo(&connector->base);
 117
 118         return intel_dvo->dev.dev_ops->get_hw_state(&intel_dvo->dev);
 119 }
 120
 121 static bool intel_dvo_get_hw_state(struct intel_encoder *encoder,
 122                                    enum pipe *pipe)
 123 {
 124         struct drm_device *dev = encoder->base.dev;
 125         struct drm_i915_private *dev_priv = dev->dev_private;
 126         struct intel_dvo *intel_dvo = enc_to_intel_dvo(&encoder->base);
 127         u32 tmp;
 128
 129         tmp = I915_READ(intel_dvo->dev.dvo_reg);
 130
 131         if (!(tmp & DVO_ENABLE))
 132                 return false;
 133
 134         *pipe = PORT_TO_PIPE(tmp);
 135
 136         return true;
 137 }
 138
 139 static void intel_disable_dvo(struct intel_encoder *encoder)
 140 {
 141         struct drm_i915_private *dev_priv = encoder->base.dev->dev_private;
 142         struct intel_dvo *intel_dvo = enc_to_intel_dvo(&encoder->base);
 143         u32 dvo_reg = intel_dvo->dev.dvo_reg;
 144         u32 temp = I915_READ(dvo_reg);
 145
 146         intel_dvo->dev.dev_ops->dpms(&intel_dvo->dev, false);
 147         I915_WRITE(dvo_reg, temp & ~DVO_ENABLE);
 148         I915_READ(dvo_reg);
 149 }
 150
 151 static void intel_enable_dvo(struct intel_encoder *encoder)
 152 {
 153         struct drm_i915_private *dev_priv = encoder->base.dev->dev_private;
 154         struct intel_dvo *intel_dvo = enc_to_intel_dvo(&encoder->base);
 155         u32 dvo_reg = intel_dvo->dev.dvo_reg;
 156         u32 temp = I915_READ(dvo_reg);
 157
 158         I915_WRITE(dvo_reg, temp | DVO_ENABLE);
 159         I915_READ(dvo_reg);
 160         intel_dvo->dev.dev_ops->dpms(&intel_dvo->dev, true);
 161 }
 162
 163 static void intel_dvo_dpms(struct drm_connector *connector, int mode)
 164 {
 165         struct intel_dvo *intel_dvo = intel_attached_dvo(connector);
 166         struct drm_crtc *crtc;
 167
 168         /* dvo supports only 2 dpms states. */
 169         if (mode != DRM_MODE_DPMS_ON)
 170                 mode = DRM_MODE_DPMS_OFF;
 171
 172         if (mode == connector->dpms)
 173                 return;
 174
 175         connector->dpms = mode;
 176
 177         /* Only need to change hw state when actually enabled */
 178         crtc = intel_dvo->base.base.crtc;
 179         if (!crtc) {
 180                 intel_dvo->base.connectors_active = false;
 181                 return;
 182         }
 183
 184         if (mode == DRM_MODE_DPMS_ON) {
 185                 intel_dvo->base.connectors_active = true;
 186
 187                 intel_crtc_update_dpms(crtc);
 188
 189                 intel_dvo->dev.dev_ops->dpms(&intel_dvo->dev, true);
 190         } else {
 191                 intel_dvo->dev.dev_ops->dpms(&intel_dvo->dev, false);
 192
 193                 intel_dvo->base.connectors_active = false;
 194
 195                 intel_crtc_update_dpms(crtc);
 196         }
 197
 198         intel_modeset_check_state(connector->dev);
 199 }
 200
 201 static int intel_dvo_mode_valid(struct drm_connector *connector,
 202                                 struct drm_display_mode *mode)
 203 {
 204         struct intel_dvo *intel_dvo = intel_attached_dvo(connector);
 205
 206         if (mode->flags & DRM_MODE_FLAG_DBLSCAN)
 207                 return MODE_NO_DBLESCAN;
 208
 209         /* XXX: Validate clock range */
 210
 211         if (intel_dvo->panel_fixed_mode) {
 212                 if (mode->hdisplay > intel_dvo->panel_fixed_mode->hdisplay)
 213                         return MODE_PANEL;
 214                 if (mode->vdisplay > intel_dvo->panel_fixed_mode->vdisplay)
 215                         return MODE_PANEL;
 216         }
 217
 218         return intel_dvo->dev.dev_ops->mode_valid(&intel_dvo->dev, mode);
 219 }
 220
 221 static bool intel_dvo_mode_fixup(struct drm_encoder *encoder,
 222                                  const struct drm_display_mode *mode,
 223                                  struct drm_display_mode *adjusted_mode)
 224 {
 225         struct intel_dvo *intel_dvo = enc_to_intel_dvo(encoder);
 226
 227         /* If we have timings from the BIOS for the panel, put them in
 228          * to the adjusted mode.  The CRTC will be set up for this mode,
 229          * with the panel scaling set up to source from the H/VDisplay
 230          * of the original mode.
 231          */
 232         if (intel_dvo->panel_fixed_mode != NULL) {
 233 #define C(x) adjusted_mode->x = intel_dvo->panel_fixed_mode->x
 234                 C(hdisplay);
 235                 C(hsync_start);
 236                 C(hsync_end);
 237                 C(htotal);
 238                 C(vdisplay);
 239                 C(vsync_start);
 240                 C(vsync_end);
 241                 C(vtotal);
 242                 C(clock);
 243 #undef C
 244         }
 245
 246         if (intel_dvo->dev.dev_ops->mode_fixup)
 247                 return intel_dvo->dev.dev_ops->mode_fixup(&intel_dvo->dev, mode, adjusted_mode);
 248
 249         return true;
 250 }
 251
 252 static void intel_dvo_mode_set(struct drm_encoder *encoder,
 253                                struct drm_display_mode *mode,
 254                                struct drm_display_mode *adjusted_mode)
 255 {
 256         struct drm_device *dev = encoder->dev;
 257         struct drm_i915_private *dev_priv = dev->dev_private;
 258         struct intel_crtc *intel_crtc = to_intel_crtc(encoder->crtc);
 259         struct intel_dvo *intel_dvo = enc_to_intel_dvo(encoder);
 260         int pipe = intel_crtc->pipe;
 261         u32 dvo_val;
 262         u32 dvo_reg = intel_dvo->dev.dvo_reg, dvo_srcdim_reg;
 263         int dpll_reg = DPLL(pipe);
 264
 265         switch (dvo_reg) {
 266         case DVOA:
 267         default:
 268                 dvo_srcdim_reg = DVOA_SRCDIM;
 269                 break;
 270         case DVOB:
 271                 dvo_srcdim_reg = DVOB_SRCDIM;
 272                 break;
 273         case DVOC:
 274                 dvo_srcdim_reg = DVOC_SRCDIM;
 275                 break;
 276         }
 277
 278         intel_dvo->dev.dev_ops->mode_set(&intel_dvo->dev, mode, adjusted_mode);
 279
 280         /* Save the data order, since I don't know what it should be set to. */
 281         dvo_val = I915_READ(dvo_reg) &
 282                   (DVO_PRESERVE_MASK | DVO_DATA_ORDER_GBRG);
 283         dvo_val |= DVO_DATA_ORDER_FP | DVO_BORDER_ENABLE |
 284                    DVO_BLANK_ACTIVE_HIGH;
 285
 286         if (pipe == 1)
 287                 dvo_val |= DVO_PIPE_B_SELECT;
 288         dvo_val |= DVO_PIPE_STALL;
 289         if (adjusted_mode->flags & DRM_MODE_FLAG_PHSYNC)
 290                 dvo_val |= DVO_HSYNC_ACTIVE_HIGH;
 291         if (adjusted_mode->flags & DRM_MODE_FLAG_PVSYNC)
 292                 dvo_val |= DVO_VSYNC_ACTIVE_HIGH;
 293
 294         I915_WRITE(dpll_reg, I915_READ(dpll_reg) | DPLL_DVO_HIGH_SPEED);
 295
 296         /*I915_WRITE(DVOB_SRCDIM,
 297           (adjusted_mode->hdisplay << DVO_SRCDIM_HORIZONTAL_SHIFT) |
 298           (adjusted_mode->VDisplay << DVO_SRCDIM_VERTICAL_SHIFT));*/
 299         I915_WRITE(dvo_srcdim_reg,
 300                    (adjusted_mode->hdisplay << DVO_SRCDIM_HORIZONTAL_SHIFT) |
 301                    (adjusted_mode->vdisplay << DVO_SRCDIM_VERTICAL_SHIFT));
 302         /*I915_WRITE(DVOB, dvo_val);*/
 303         I915_WRITE(dvo_reg, dvo_val);
 304 }
 305
 306 /**
 307  * Detect the output connection on our DVO device.
 308  *
 309  * Unimplemented.
 310  */
 311 static enum drm_connector_status
 312 intel_dvo_detect(struct drm_connector *connector, bool force)
 313 {
 314         struct intel_dvo *intel_dvo = intel_attached_dvo(connector);
 315         return intel_dvo->dev.dev_ops->detect(&intel_dvo->dev);
 316 }
 317
 318 static int intel_dvo_get_modes(struct drm_connector *connector)
 319 {
 320         struct intel_dvo *intel_dvo = intel_attached_dvo(connector);
 321         struct drm_i915_private *dev_priv = connector->dev->dev_private;
 322
 323         /* We should probably have an i2c driver get_modes function for those
 324          * devices which will have a fixed set of modes determined by the chip
 325          * (TV-out, for example), but for now with just TMDS and LVDS,
 326          * that's not the case.
 327          */
 328         intel_ddc_get_modes(connector,
 329                             intel_gmbus_get_adapter(dev_priv, GMBUS_PORT_DPC));
 330         if (!list_empty(&connector->probed_modes))
 331                 return 1;
 332
 333         if (intel_dvo->panel_fixed_mode != NULL) {
 334                 struct drm_display_mode *mode;
 335                 mode = drm_mode_duplicate(connector->dev, intel_dvo->panel_fixed_mode);
 336                 if (mode) {
 337                         drm_mode_probed_add(connector, mode);
 338                         return 1;
 339                 }
 340         }
 341
 342         return 0;
 343 }
 344
 345 static void intel_dvo_destroy(struct drm_connector *connector)
 346 {
 347         drm_sysfs_connector_remove(connector);
 348         drm_connector_cleanup(connector);
 349         kfree(connector);
 350 }
 351
 352 static const struct drm_encoder_helper_funcs intel_dvo_helper_funcs = {
 353         .mode_fixup = intel_dvo_mode_fixup,
 354         .mode_set = intel_dvo_mode_set,
 355 };
 356
 357 static const struct drm_connector_funcs intel_dvo_connector_funcs = {
 358         .dpms = intel_dvo_dpms,
 359         .detect = intel_dvo_detect,
 360         .destroy = intel_dvo_destroy,
 361         .fill_modes = drm_helper_probe_single_connector_modes,
 362 };
 363
 364 static const struct drm_connector_helper_funcs intel_dvo_connector_helper_funcs = {
 365         .mode_valid = intel_dvo_mode_valid,
 366         .get_modes = intel_dvo_get_modes,
 367         .best_encoder = intel_best_encoder,
 368 };
 369
 370 static void intel_dvo_enc_destroy(struct drm_encoder *encoder)
 371 {
 372         struct intel_dvo *intel_dvo = enc_to_intel_dvo(encoder);
 373
 374         if (intel_dvo->dev.dev_ops->destroy)
 375                 intel_dvo->dev.dev_ops->destroy(&intel_dvo->dev);
 376
 377         kfree(intel_dvo->panel_fixed_mode);
 378
 379         intel_encoder_destroy(encoder);
 380 }
 381
 382 static const struct drm_encoder_funcs intel_dvo_enc_funcs = {
 383         .destroy = intel_dvo_enc_destroy,
 384 };
 385
 386 /**
 387  * Attempts to get a fixed panel timing for LVDS (currently only the i830).
 388  *
 389  * Other chips with DVO LVDS will need to extend this to deal with the LVDS
 390  * chip being on DVOB/C and having multiple pipes.
 391  */
 392 static struct drm_display_mode *
 393 intel_dvo_get_current_mode(struct drm_connector *connector)
 394 {
 395         struct drm_device *dev = connector->dev;
 396         struct drm_i915_private *dev_priv = dev->dev_private;
 397         struct intel_dvo *intel_dvo = intel_attached_dvo(connector);
 398         uint32_t dvo_val = I915_READ(intel_dvo->dev.dvo_reg);
 399         struct drm_display_mode *mode = NULL;
 400
 401         /* If the DVO port is active, that'll be the LVDS, so we can pull out
 402          * its timings to get how the BIOS set up the panel.
 403          */
 404         if (dvo_val & DVO_ENABLE) {
 405                 struct drm_crtc *crtc;
 406                 int pipe = (dvo_val & DVO_PIPE_B_SELECT) ? 1 : 0;
 407
 408                 crtc = intel_get_crtc_for_pipe(dev, pipe);
 409                 if (crtc) {
 410                         mode = intel_crtc_mode_get(dev, crtc);
 411                         if (mode) {
 412                                 mode->type |= DRM_MODE_TYPE_PREFERRED;
 413                                 if (dvo_val & DVO_HSYNC_ACTIVE_HIGH)
 414                                         mode->flags |= DRM_MODE_FLAG_PHSYNC;
 415                                 if (dvo_val & DVO_VSYNC_ACTIVE_HIGH)
 416                                         mode->flags |= DRM_MODE_FLAG_PVSYNC;
 417                         }
 418                 }
 419         }
 420
 421         return mode;
 422 }
 423
 424 void intel_dvo_init(struct drm_device *dev)
 425 {
 426         struct drm_i915_private *dev_priv = dev->dev_private;
 427         struct intel_encoder *intel_encoder;
 428         struct intel_dvo *intel_dvo;
 429         struct intel_connector *intel_connector;
 430         int i;
 431         int encoder_type = DRM_MODE_ENCODER_NONE;
 432
 433         intel_dvo = kzalloc(sizeof(struct intel_dvo), GFP_KERNEL);
 434         if (!intel_dvo)
 435                 return;
 436
 437         intel_connector = kzalloc(sizeof(struct intel_connector), GFP_KERNEL);
 438         if (!intel_connector) {
 439                 kfree(intel_dvo);
 440                 return;
 441         }
 442
 443         intel_encoder = &intel_dvo->base;
 444         drm_encoder_init(dev, &intel_encoder->base,
 445                          &intel_dvo_enc_funcs, encoder_type);
 446
 447         intel_encoder->disable = intel_disable_dvo;
 448         intel_encoder->enable = intel_enable_dvo;
 449         intel_encoder->get_hw_state = intel_dvo_get_hw_state;
 450         intel_connector->get_hw_state = intel_dvo_connector_get_hw_state;
 451
 452         /* Now, try to find a controller */
 453         for (i = 0; i < ARRAY_SIZE(intel_dvo_devices); i++) {
 454                 struct drm_connector *connector = &intel_connector->base;
 455                 const struct intel_dvo_device *dvo = &intel_dvo_devices[i];
 456                 struct i2c_adapter *i2c;
 457                 int gpio;
 458                 bool dvoinit;
 459
 460                 /* Allow the I2C driver info to specify the GPIO to be used in
 461                  * special cases, but otherwise default to what's defined
 462                  * in the spec.
 463                  */
 464                 if (intel_gmbus_is_port_valid(dvo->gpio))
 465                         gpio = dvo->gpio;
 466                 else if (dvo->type == INTEL_DVO_CHIP_LVDS)
 467                         gpio = GMBUS_PORT_SSC;
 468                 else
 469                         gpio = GMBUS_PORT_DPB;
 470
 471                 /* Set up the I2C bus necessary for the chip we're probing.
 472                  * It appears that everything is on GPIOE except for panels
 473                  * on i830 laptops, which are on GPIOB (DVOA).
 474                  */
 475                 i2c = intel_gmbus_get_adapter(dev_priv, gpio);
 476
 477                 intel_dvo->dev = *dvo;
 478
 479                 /* GMBUS NAK handling seems to be unstable, hence let the
 480                  * transmitter detection run in bit banging mode for now.
 481                  */
 482                 intel_gmbus_force_bit(i2c, true);
 483
 484                 dvoinit = dvo->dev_ops->init(&intel_dvo->dev, i2c);
 485
 486                 intel_gmbus_force_bit(i2c, false);
 487
 488                 if (!dvoinit)
 489                         continue;
 490
 491                 intel_encoder->type = INTEL_OUTPUT_DVO;
 492                 intel_encoder->crtc_mask = (1 << 0) | (1 << 1);
 493                 switch (dvo->type) {
 494                 case INTEL_DVO_CHIP_TMDS:
 495                         intel_encoder->cloneable = true;
 496                         drm_connector_init(dev, connector,
 497                                            &intel_dvo_connector_funcs,
 498                                            DRM_MODE_CONNECTOR_DVII);
 499                         encoder_type = DRM_MODE_ENCODER_TMDS;
 500                         break;
 501                 case INTEL_DVO_CHIP_LVDS:
 502                         intel_encoder->cloneable = false;
 503                         drm_connector_init(dev, connector,
 504                                            &intel_dvo_connector_funcs,
 505                                            DRM_MODE_CONNECTOR_LVDS);
 506                         encoder_type = DRM_MODE_ENCODER_LVDS;
 507                         break;
 508                 }
 509
 510                 drm_connector_helper_add(connector,
 511                                          &intel_dvo_connector_helper_funcs);
 512                 connector->display_info.subpixel_order = SubPixelHorizontalRGB;
 513                 connector->interlace_allowed = false;
 514                 connector->doublescan_allowed = false;
 515
 516                 drm_encoder_helper_add(&intel_encoder->base,
 517                                        &intel_dvo_helper_funcs);
 518
 519                 intel_connector_attach_encoder(intel_connector, intel_encoder);
 520                 if (dvo->type == INTEL_DVO_CHIP_LVDS) {
 521                         /* For our LVDS chipsets, we should hopefully be able
 522                          * to dig the fixed panel mode out of the BIOS data.
 523                          * However, it's in a different format from the BIOS
 524                          * data on chipsets with integrated LVDS (stored in AIM
 525                          * headers, likely), so for now, just get the current
 526                          * mode being output through DVO.
 527                          */
 528                         intel_dvo->panel_fixed_mode =
 529                                 intel_dvo_get_current_mode(connector);
 530                         intel_dvo->panel_wants_dither = true;
 531                 }
 532
 533                 drm_sysfs_connector_add(connector);
 534                 return;
 535         }
 536
 537         drm_encoder_cleanup(&intel_encoder->base);
 538         kfree(intel_dvo);
 539         kfree(intel_connector);
 540 }