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_dvo(struct intel_encoder *encoder)
 104 {
 105         return container_of(encoder, struct intel_dvo, base);
 106 }
 107
 108 static struct intel_dvo *intel_attached_dvo(struct drm_connector *connector)
 109 {
 110         return enc_to_dvo(intel_attached_encoder(connector));
 111 }
 112
 113 static bool intel_dvo_connector_get_hw_state(struct intel_connector *connector)
 114 {
 115         struct intel_dvo *intel_dvo = intel_attached_dvo(&connector->base);
 116
 117         return intel_dvo->dev.dev_ops->get_hw_state(&intel_dvo->dev);
 118 }
 119
 120 static bool intel_dvo_get_hw_state(struct intel_encoder *encoder,
 121                                    enum pipe *pipe)
 122 {
 123         struct drm_device *dev = encoder->base.dev;
 124         struct drm_i915_private *dev_priv = dev->dev_private;
 125         struct intel_dvo *intel_dvo = enc_to_dvo(encoder);
 126         u32 tmp;
 127
 128         tmp = I915_READ(intel_dvo->dev.dvo_reg);
 129
 130         if (!(tmp & DVO_ENABLE))
 131                 return false;
 132
 133         *pipe = PORT_TO_PIPE(tmp);
 134
 135         return true;
 136 }
 137
 138 static void intel_dvo_get_config(struct intel_encoder *encoder,
 139                                  struct intel_crtc_config *pipe_config)
 140 {
 141         struct drm_i915_private *dev_priv = encoder->base.dev->dev_private;
 142         struct intel_dvo *intel_dvo = enc_to_dvo(encoder);
 143         u32 tmp, flags = 0;
 144
 145         tmp = I915_READ(intel_dvo->dev.dvo_reg);
 146         if (tmp & DVO_HSYNC_ACTIVE_HIGH)
 147                 flags |= DRM_MODE_FLAG_PHSYNC;
 148         else
 149                 flags |= DRM_MODE_FLAG_NHSYNC;
 150         if (tmp & DVO_VSYNC_ACTIVE_HIGH)
 151                 flags |= DRM_MODE_FLAG_PVSYNC;
 152         else
 153                 flags |= DRM_MODE_FLAG_NVSYNC;
 154
 155         pipe_config->adjusted_mode.flags |= flags;
 156
 157         pipe_config->adjusted_mode.clock = pipe_config->port_clock;
 158 }
 159
 160 static void intel_disable_dvo(struct intel_encoder *encoder)
 161 {
 162         struct drm_i915_private *dev_priv = encoder->base.dev->dev_private;
 163         struct intel_dvo *intel_dvo = enc_to_dvo(encoder);
 164         u32 dvo_reg = intel_dvo->dev.dvo_reg;
 165         u32 temp = I915_READ(dvo_reg);
 166
 167         intel_dvo->dev.dev_ops->dpms(&intel_dvo->dev, false);
 168         I915_WRITE(dvo_reg, temp & ~DVO_ENABLE);
 169         I915_READ(dvo_reg);
 170 }
 171
 172 static void intel_enable_dvo(struct intel_encoder *encoder)
 173 {
 174         struct drm_i915_private *dev_priv = encoder->base.dev->dev_private;
 175         struct intel_dvo *intel_dvo = enc_to_dvo(encoder);
 176         u32 dvo_reg = intel_dvo->dev.dvo_reg;
 177         u32 temp = I915_READ(dvo_reg);
 178
 179         I915_WRITE(dvo_reg, temp | DVO_ENABLE);
 180         I915_READ(dvo_reg);
 181         intel_dvo->dev.dev_ops->dpms(&intel_dvo->dev, true);
 182 }
 183
 184 /* Special dpms function to support cloning between dvo/sdvo/crt. */
 185 static void intel_dvo_dpms(struct drm_connector *connector, int mode)
 186 {
 187         struct intel_dvo *intel_dvo = intel_attached_dvo(connector);
 188         struct drm_crtc *crtc;
 189
 190         /* dvo supports only 2 dpms states. */
 191         if (mode != DRM_MODE_DPMS_ON)
 192                 mode = DRM_MODE_DPMS_OFF;
 193
 194         if (mode == connector->dpms)
 195                 return;
 196
 197         connector->dpms = mode;
 198
 199         /* Only need to change hw state when actually enabled */
 200         crtc = intel_dvo->base.base.crtc;
 201         if (!crtc) {
 202                 intel_dvo->base.connectors_active = false;
 203                 return;
 204         }
 205
 206         /* We call connector dpms manually below in case pipe dpms doesn't
 207          * change due to cloning. */
 208         if (mode == DRM_MODE_DPMS_ON) {
 209                 intel_dvo->base.connectors_active = true;
 210
 211                 intel_crtc_update_dpms(crtc);
 212
 213                 intel_dvo->dev.dev_ops->dpms(&intel_dvo->dev, true);
 214         } else {
 215                 intel_dvo->dev.dev_ops->dpms(&intel_dvo->dev, false);
 216
 217                 intel_dvo->base.connectors_active = false;
 218
 219                 intel_crtc_update_dpms(crtc);
 220         }
 221
 222         intel_modeset_check_state(connector->dev);
 223 }
 224
 225 static int intel_dvo_mode_valid(struct drm_connector *connector,
 226                                 struct drm_display_mode *mode)
 227 {
 228         struct intel_dvo *intel_dvo = intel_attached_dvo(connector);
 229
 230         if (mode->flags & DRM_MODE_FLAG_DBLSCAN)
 231                 return MODE_NO_DBLESCAN;
 232
 233         /* XXX: Validate clock range */
 234
 235         if (intel_dvo->panel_fixed_mode) {
 236                 if (mode->hdisplay > intel_dvo->panel_fixed_mode->hdisplay)
 237                         return MODE_PANEL;
 238                 if (mode->vdisplay > intel_dvo->panel_fixed_mode->vdisplay)
 239                         return MODE_PANEL;
 240         }
 241
 242         return intel_dvo->dev.dev_ops->mode_valid(&intel_dvo->dev, mode);
 243 }
 244
 245 static bool intel_dvo_compute_config(struct intel_encoder *encoder,
 246                                      struct intel_crtc_config *pipe_config)
 247 {
 248         struct intel_dvo *intel_dvo = enc_to_dvo(encoder);
 249         struct drm_display_mode *adjusted_mode = &pipe_config->adjusted_mode;
 250
 251         /* If we have timings from the BIOS for the panel, put them in
 252          * to the adjusted mode.  The CRTC will be set up for this mode,
 253          * with the panel scaling set up to source from the H/VDisplay
 254          * of the original mode.
 255          */
 256         if (intel_dvo->panel_fixed_mode != NULL) {
 257 #define C(x) adjusted_mode->x = intel_dvo->panel_fixed_mode->x
 258                 C(hdisplay);
 259                 C(hsync_start);
 260                 C(hsync_end);
 261                 C(htotal);
 262                 C(vdisplay);
 263                 C(vsync_start);
 264                 C(vsync_end);
 265                 C(vtotal);
 266                 C(clock);
 267 #undef C
 268
 269                 drm_mode_set_crtcinfo(adjusted_mode, 0);
 270         }
 271
 272         return true;
 273 }
 274
 275 static void intel_dvo_mode_set(struct intel_encoder *encoder)
 276 {
 277         struct drm_device *dev = encoder->base.dev;
 278         struct drm_i915_private *dev_priv = dev->dev_private;
 279         struct intel_crtc *crtc = to_intel_crtc(encoder->base.crtc);
 280         struct drm_display_mode *adjusted_mode = &crtc->config.adjusted_mode;
 281         struct intel_dvo *intel_dvo = enc_to_dvo(encoder);
 282         int pipe = crtc->pipe;
 283         u32 dvo_val;
 284         u32 dvo_reg = intel_dvo->dev.dvo_reg, dvo_srcdim_reg;
 285
 286         switch (dvo_reg) {
 287         case DVOA:
 288         default:
 289                 dvo_srcdim_reg = DVOA_SRCDIM;
 290                 break;
 291         case DVOB:
 292                 dvo_srcdim_reg = DVOB_SRCDIM;
 293                 break;
 294         case DVOC:
 295                 dvo_srcdim_reg = DVOC_SRCDIM;
 296                 break;
 297         }
 298
 299         intel_dvo->dev.dev_ops->mode_set(&intel_dvo->dev,
 300                                          &crtc->config.requested_mode,
 301                                          adjusted_mode);
 302
 303         /* Save the data order, since I don't know what it should be set to. */
 304         dvo_val = I915_READ(dvo_reg) &
 305                   (DVO_PRESERVE_MASK | DVO_DATA_ORDER_GBRG);
 306         dvo_val |= DVO_DATA_ORDER_FP | DVO_BORDER_ENABLE |
 307                    DVO_BLANK_ACTIVE_HIGH;
 308
 309         if (pipe == 1)
 310                 dvo_val |= DVO_PIPE_B_SELECT;
 311         dvo_val |= DVO_PIPE_STALL;
 312         if (adjusted_mode->flags & DRM_MODE_FLAG_PHSYNC)
 313                 dvo_val |= DVO_HSYNC_ACTIVE_HIGH;
 314         if (adjusted_mode->flags & DRM_MODE_FLAG_PVSYNC)
 315                 dvo_val |= DVO_VSYNC_ACTIVE_HIGH;
 316
 317         /*I915_WRITE(DVOB_SRCDIM,
 318           (adjusted_mode->hdisplay << DVO_SRCDIM_HORIZONTAL_SHIFT) |
 319           (adjusted_mode->VDisplay << DVO_SRCDIM_VERTICAL_SHIFT));*/
 320         I915_WRITE(dvo_srcdim_reg,
 321                    (adjusted_mode->hdisplay << DVO_SRCDIM_HORIZONTAL_SHIFT) |
 322                    (adjusted_mode->vdisplay << DVO_SRCDIM_VERTICAL_SHIFT));
 323         /*I915_WRITE(DVOB, dvo_val);*/
 324         I915_WRITE(dvo_reg, dvo_val);
 325 }
 326
 327 /**
 328  * Detect the output connection on our DVO device.
 329  *
 330  * Unimplemented.
 331  */
 332 static enum drm_connector_status
 333 intel_dvo_detect(struct drm_connector *connector, bool force)
 334 {
 335         struct intel_dvo *intel_dvo = intel_attached_dvo(connector);
 336         DRM_DEBUG_KMS("[CONNECTOR:%d:%s]\n",
 337                       connector->base.id, drm_get_connector_name(connector));
 338         return intel_dvo->dev.dev_ops->detect(&intel_dvo->dev);
 339 }
 340
 341 static int intel_dvo_get_modes(struct drm_connector *connector)
 342 {
 343         struct intel_dvo *intel_dvo = intel_attached_dvo(connector);
 344         struct drm_i915_private *dev_priv = connector->dev->dev_private;
 345
 346         /* We should probably have an i2c driver get_modes function for those
 347          * devices which will have a fixed set of modes determined by the chip
 348          * (TV-out, for example), but for now with just TMDS and LVDS,
 349          * that's not the case.
 350          */
 351         intel_ddc_get_modes(connector,
 352                             intel_gmbus_get_adapter(dev_priv, GMBUS_PORT_DPC));
 353         if (!list_empty(&connector->probed_modes))
 354                 return 1;
 355
 356         if (intel_dvo->panel_fixed_mode != NULL) {
 357                 struct drm_display_mode *mode;
 358                 mode = drm_mode_duplicate(connector->dev, intel_dvo->panel_fixed_mode);
 359                 if (mode) {
 360                         drm_mode_probed_add(connector, mode);
 361                         return 1;
 362                 }
 363         }
 364
 365         return 0;
 366 }
 367
 368 static void intel_dvo_destroy(struct drm_connector *connector)
 369 {
 370         drm_sysfs_connector_remove(connector);
 371         drm_connector_cleanup(connector);
 372         kfree(connector);
 373 }
 374
 375 static const struct drm_connector_funcs intel_dvo_connector_funcs = {
 376         .dpms = intel_dvo_dpms,
 377         .detect = intel_dvo_detect,
 378         .destroy = intel_dvo_destroy,
 379         .fill_modes = drm_helper_probe_single_connector_modes,
 380 };
 381
 382 static const struct drm_connector_helper_funcs intel_dvo_connector_helper_funcs = {
 383         .mode_valid = intel_dvo_mode_valid,
 384         .get_modes = intel_dvo_get_modes,
 385         .best_encoder = intel_best_encoder,
 386 };
 387
 388 static void intel_dvo_enc_destroy(struct drm_encoder *encoder)
 389 {
 390         struct intel_dvo *intel_dvo = enc_to_dvo(to_intel_encoder(encoder));
 391
 392         if (intel_dvo->dev.dev_ops->destroy)
 393                 intel_dvo->dev.dev_ops->destroy(&intel_dvo->dev);
 394
 395         kfree(intel_dvo->panel_fixed_mode);
 396
 397         intel_encoder_destroy(encoder);
 398 }
 399
 400 static const struct drm_encoder_funcs intel_dvo_enc_funcs = {
 401         .destroy = intel_dvo_enc_destroy,
 402 };
 403
 404 /**
 405  * Attempts to get a fixed panel timing for LVDS (currently only the i830).
 406  *
 407  * Other chips with DVO LVDS will need to extend this to deal with the LVDS
 408  * chip being on DVOB/C and having multiple pipes.
 409  */
 410 static struct drm_display_mode *
 411 intel_dvo_get_current_mode(struct drm_connector *connector)
 412 {
 413         struct drm_device *dev = connector->dev;
 414         struct drm_i915_private *dev_priv = dev->dev_private;
 415         struct intel_dvo *intel_dvo = intel_attached_dvo(connector);
 416         uint32_t dvo_val = I915_READ(intel_dvo->dev.dvo_reg);
 417         struct drm_display_mode *mode = NULL;
 418
 419         /* If the DVO port is active, that'll be the LVDS, so we can pull out
 420          * its timings to get how the BIOS set up the panel.
 421          */
 422         if (dvo_val & DVO_ENABLE) {
 423                 struct drm_crtc *crtc;
 424                 int pipe = (dvo_val & DVO_PIPE_B_SELECT) ? 1 : 0;
 425
 426                 crtc = intel_get_crtc_for_pipe(dev, pipe);
 427                 if (crtc) {
 428                         mode = intel_crtc_mode_get(dev, crtc);
 429                         if (mode) {
 430                                 mode->type |= DRM_MODE_TYPE_PREFERRED;
 431                                 if (dvo_val & DVO_HSYNC_ACTIVE_HIGH)
 432                                         mode->flags |= DRM_MODE_FLAG_PHSYNC;
 433                                 if (dvo_val & DVO_VSYNC_ACTIVE_HIGH)
 434                                         mode->flags |= DRM_MODE_FLAG_PVSYNC;
 435                         }
 436                 }
 437         }
 438
 439         return mode;
 440 }
 441
 442 void intel_dvo_init(struct drm_device *dev)
 443 {
 444         struct drm_i915_private *dev_priv = dev->dev_private;
 445         struct intel_encoder *intel_encoder;
 446         struct intel_dvo *intel_dvo;
 447         struct intel_connector *intel_connector;
 448         int i;
 449         int encoder_type = DRM_MODE_ENCODER_NONE;
 450
 451         intel_dvo = kzalloc(sizeof(*intel_dvo), GFP_KERNEL);
 452         if (!intel_dvo)
 453                 return;
 454
 455         intel_connector = kzalloc(sizeof(*intel_connector), GFP_KERNEL);
 456         if (!intel_connector) {
 457                 kfree(intel_dvo);
 458                 return;
 459         }
 460
 461         intel_encoder = &intel_dvo->base;
 462         drm_encoder_init(dev, &intel_encoder->base,
 463                          &intel_dvo_enc_funcs, encoder_type);
 464
 465         intel_encoder->disable = intel_disable_dvo;
 466         intel_encoder->enable = intel_enable_dvo;
 467         intel_encoder->get_hw_state = intel_dvo_get_hw_state;
 468         intel_encoder->get_config = intel_dvo_get_config;
 469         intel_encoder->compute_config = intel_dvo_compute_config;
 470         intel_encoder->mode_set = intel_dvo_mode_set;
 471         intel_connector->get_hw_state = intel_dvo_connector_get_hw_state;
 472
 473         /* Now, try to find a controller */
 474         for (i = 0; i < ARRAY_SIZE(intel_dvo_devices); i++) {
 475                 struct drm_connector *connector = &intel_connector->base;
 476                 const struct intel_dvo_device *dvo = &intel_dvo_devices[i];
 477                 struct i2c_adapter *i2c;
 478                 int gpio;
 479                 bool dvoinit;
 480
 481                 /* Allow the I2C driver info to specify the GPIO to be used in
 482                  * special cases, but otherwise default to what's defined
 483                  * in the spec.
 484                  */
 485                 if (intel_gmbus_is_port_valid(dvo->gpio))
 486                         gpio = dvo->gpio;
 487                 else if (dvo->type == INTEL_DVO_CHIP_LVDS)
 488                         gpio = GMBUS_PORT_SSC;
 489                 else
 490                         gpio = GMBUS_PORT_DPB;
 491
 492                 /* Set up the I2C bus necessary for the chip we're probing.
 493                  * It appears that everything is on GPIOE except for panels
 494                  * on i830 laptops, which are on GPIOB (DVOA).
 495                  */
 496                 i2c = intel_gmbus_get_adapter(dev_priv, gpio);
 497
 498                 intel_dvo->dev = *dvo;
 499
 500                 /* GMBUS NAK handling seems to be unstable, hence let the
 501                  * transmitter detection run in bit banging mode for now.
 502                  */
 503                 intel_gmbus_force_bit(i2c, true);
 504
 505                 dvoinit = dvo->dev_ops->init(&intel_dvo->dev, i2c);
 506
 507                 intel_gmbus_force_bit(i2c, false);
 508
 509                 if (!dvoinit)
 510                         continue;
 511
 512                 intel_encoder->type = INTEL_OUTPUT_DVO;
 513                 intel_encoder->crtc_mask = (1 << 0) | (1 << 1);
 514                 switch (dvo->type) {
 515                 case INTEL_DVO_CHIP_TMDS:
 516                         intel_encoder->cloneable = true;
 517                         drm_connector_init(dev, connector,
 518                                            &intel_dvo_connector_funcs,
 519                                            DRM_MODE_CONNECTOR_DVII);
 520                         encoder_type = DRM_MODE_ENCODER_TMDS;
 521                         break;
 522                 case INTEL_DVO_CHIP_LVDS:
 523                         intel_encoder->cloneable = false;
 524                         drm_connector_init(dev, connector,
 525                                            &intel_dvo_connector_funcs,
 526                                            DRM_MODE_CONNECTOR_LVDS);
 527                         encoder_type = DRM_MODE_ENCODER_LVDS;
 528                         break;
 529                 }
 530
 531                 drm_connector_helper_add(connector,
 532                                          &intel_dvo_connector_helper_funcs);
 533                 connector->display_info.subpixel_order = SubPixelHorizontalRGB;
 534                 connector->interlace_allowed = false;
 535                 connector->doublescan_allowed = false;
 536
 537                 intel_connector_attach_encoder(intel_connector, intel_encoder);
 538                 if (dvo->type == INTEL_DVO_CHIP_LVDS) {
 539                         /* For our LVDS chipsets, we should hopefully be able
 540                          * to dig the fixed panel mode out of the BIOS data.
 541                          * However, it's in a different format from the BIOS
 542                          * data on chipsets with integrated LVDS (stored in AIM
 543                          * headers, likely), so for now, just get the current
 544                          * mode being output through DVO.
 545                          */
 546                         intel_dvo->panel_fixed_mode =
 547                                 intel_dvo_get_current_mode(connector);
 548                         intel_dvo->panel_wants_dither = true;
 549                 }
 550
 551                 drm_sysfs_connector_add(connector);
 552                 return;
 553         }
 554
 555         drm_encoder_cleanup(&intel_encoder->base);
 556         kfree(intel_dvo);
 557         kfree(intel_connector);
 558 }