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