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