drivers/gpu/drm/i915/display/intel_lvds.c

   1 /*
   2  * Copyright © 2006-2007 Intel Corporation
   3  * Copyright (c) 2006 Dave Airlie <airlied@linux.ie>
   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  *      Dave Airlie <airlied@linux.ie>
  27  *      Jesse Barnes <jesse.barnes@intel.com>
  28  */
  29
  30 #include <acpi/button.h>
  31 #include <linux/acpi.h>
  32 #include <linux/dmi.h>
  33 #include <linux/i2c.h>
  34 #include <linux/slab.h>
  35 #include <linux/vga_switcheroo.h>
  36
  37 #include <drm/drm_atomic_helper.h>
  38 #include <drm/drm_crtc.h>
  39 #include <drm/drm_edid.h>
  40 #include <drm/i915_drm.h>
  41
  42 #include "i915_drv.h"
  43 #include "intel_atomic.h"
  44 #include "intel_connector.h"
  45 #include "intel_display_types.h"
  46 #include "intel_gmbus.h"
  47 #include "intel_lvds.h"
  48 #include "intel_panel.h"
  49
  50 /* Private structure for the integrated LVDS support */
  51 struct intel_lvds_pps {
  52         /* 100us units */
  53         int t1_t2;
  54         int t3;
  55         int t4;
  56         int t5;
  57         int tx;
  58
  59         int divider;
  60
  61         int port;
  62         bool powerdown_on_reset;
  63 };
  64
  65 struct intel_lvds_encoder {
  66         struct intel_encoder base;
  67
  68         bool is_dual_link;
  69         i915_reg_t reg;
  70         u32 a3_power;
  71
  72         struct intel_lvds_pps init_pps;
  73         u32 init_lvds_val;
  74
  75         struct intel_connector *attached_connector;
  76 };
  77
  78 static struct intel_lvds_encoder *to_lvds_encoder(struct drm_encoder *encoder)
  79 {
  80         return container_of(encoder, struct intel_lvds_encoder, base.base);
  81 }
  82
  83 bool intel_lvds_port_enabled(struct drm_i915_private *dev_priv,
  84                              i915_reg_t lvds_reg, enum pipe *pipe)
  85 {
  86         u32 val;
  87
  88         val = I915_READ(lvds_reg);
  89
  90         /* asserts want to know the pipe even if the port is disabled */
  91         if (HAS_PCH_CPT(dev_priv))
  92                 *pipe = (val & LVDS_PIPE_SEL_MASK_CPT) >> LVDS_PIPE_SEL_SHIFT_CPT;
  93         else
  94                 *pipe = (val & LVDS_PIPE_SEL_MASK) >> LVDS_PIPE_SEL_SHIFT;
  95
  96         return val & LVDS_PORT_EN;
  97 }
  98
  99 static bool intel_lvds_get_hw_state(struct intel_encoder *encoder,
 100                                     enum pipe *pipe)
 101 {
 102         struct drm_i915_private *dev_priv = to_i915(encoder->base.dev);
 103         struct intel_lvds_encoder *lvds_encoder = to_lvds_encoder(&encoder->base);
 104         intel_wakeref_t wakeref;
 105         bool ret;
 106
 107         wakeref = intel_display_power_get_if_enabled(dev_priv,
 108                                                      encoder->power_domain);
 109         if (!wakeref)
 110                 return false;
 111
 112         ret = intel_lvds_port_enabled(dev_priv, lvds_encoder->reg, pipe);
 113
 114         intel_display_power_put(dev_priv, encoder->power_domain, wakeref);
 115
 116         return ret;
 117 }
 118
 119 static void intel_lvds_get_config(struct intel_encoder *encoder,
 120                                   struct intel_crtc_state *pipe_config)
 121 {
 122         struct drm_i915_private *dev_priv = to_i915(encoder->base.dev);
 123         struct intel_lvds_encoder *lvds_encoder = to_lvds_encoder(&encoder->base);
 124         u32 tmp, flags = 0;
 125
 126         pipe_config->output_types |= BIT(INTEL_OUTPUT_LVDS);
 127
 128         tmp = I915_READ(lvds_encoder->reg);
 129         if (tmp & LVDS_HSYNC_POLARITY)
 130                 flags |= DRM_MODE_FLAG_NHSYNC;
 131         else
 132                 flags |= DRM_MODE_FLAG_PHSYNC;
 133         if (tmp & LVDS_VSYNC_POLARITY)
 134                 flags |= DRM_MODE_FLAG_NVSYNC;
 135         else
 136                 flags |= DRM_MODE_FLAG_PVSYNC;
 137
 138         pipe_config->base.adjusted_mode.flags |= flags;
 139
 140         if (INTEL_GEN(dev_priv) < 5)
 141                 pipe_config->gmch_pfit.lvds_border_bits =
 142                         tmp & LVDS_BORDER_ENABLE;
 143
 144         /* gen2/3 store dither state in pfit control, needs to match */
 145         if (INTEL_GEN(dev_priv) < 4) {
 146                 tmp = I915_READ(PFIT_CONTROL);
 147
 148                 pipe_config->gmch_pfit.control |= tmp & PANEL_8TO6_DITHER_ENABLE;
 149         }
 150
 151         pipe_config->base.adjusted_mode.crtc_clock = pipe_config->port_clock;
 152 }
 153
 154 static void intel_lvds_pps_get_hw_state(struct drm_i915_private *dev_priv,
 155                                         struct intel_lvds_pps *pps)
 156 {
 157         u32 val;
 158
 159         pps->powerdown_on_reset = I915_READ(PP_CONTROL(0)) & PANEL_POWER_RESET;
 160
 161         val = I915_READ(PP_ON_DELAYS(0));
 162         pps->port = REG_FIELD_GET(PANEL_PORT_SELECT_MASK, val);
 163         pps->t1_t2 = REG_FIELD_GET(PANEL_POWER_UP_DELAY_MASK, val);
 164         pps->t5 = REG_FIELD_GET(PANEL_LIGHT_ON_DELAY_MASK, val);
 165
 166         val = I915_READ(PP_OFF_DELAYS(0));
 167         pps->t3 = REG_FIELD_GET(PANEL_POWER_DOWN_DELAY_MASK, val);
 168         pps->tx = REG_FIELD_GET(PANEL_LIGHT_OFF_DELAY_MASK, val);
 169
 170         val = I915_READ(PP_DIVISOR(0));
 171         pps->divider = REG_FIELD_GET(PP_REFERENCE_DIVIDER_MASK, val);
 172         val = REG_FIELD_GET(PANEL_POWER_CYCLE_DELAY_MASK, val);
 173         /*
 174          * Remove the BSpec specified +1 (100ms) offset that accounts for a
 175          * too short power-cycle delay due to the asynchronous programming of
 176          * the register.
 177          */
 178         if (val)
 179                 val--;
 180         /* Convert from 100ms to 100us units */
 181         pps->t4 = val * 1000;
 182
 183         if (INTEL_GEN(dev_priv) <= 4 &&
 184             pps->t1_t2 == 0 && pps->t5 == 0 && pps->t3 == 0 && pps->tx == 0) {
 185                 DRM_DEBUG_KMS("Panel power timings uninitialized, "
 186                               "setting defaults\n");
 187                 /* Set T2 to 40ms and T5 to 200ms in 100 usec units */
 188                 pps->t1_t2 = 40 * 10;
 189                 pps->t5 = 200 * 10;
 190                 /* Set T3 to 35ms and Tx to 200ms in 100 usec units */
 191                 pps->t3 = 35 * 10;
 192                 pps->tx = 200 * 10;
 193         }
 194
 195         DRM_DEBUG_DRIVER("LVDS PPS:t1+t2 %d t3 %d t4 %d t5 %d tx %d "
 196                          "divider %d port %d powerdown_on_reset %d\n",
 197                          pps->t1_t2, pps->t3, pps->t4, pps->t5, pps->tx,
 198                          pps->divider, pps->port, pps->powerdown_on_reset);
 199 }
 200
 201 static void intel_lvds_pps_init_hw(struct drm_i915_private *dev_priv,
 202                                    struct intel_lvds_pps *pps)
 203 {
 204         u32 val;
 205
 206         val = I915_READ(PP_CONTROL(0));
 207         WARN_ON((val & PANEL_UNLOCK_MASK) != PANEL_UNLOCK_REGS);
 208         if (pps->powerdown_on_reset)
 209                 val |= PANEL_POWER_RESET;
 210         I915_WRITE(PP_CONTROL(0), val);
 211
 212         I915_WRITE(PP_ON_DELAYS(0),
 213                    REG_FIELD_PREP(PANEL_PORT_SELECT_MASK, pps->port) |
 214                    REG_FIELD_PREP(PANEL_POWER_UP_DELAY_MASK, pps->t1_t2) |
 215                    REG_FIELD_PREP(PANEL_LIGHT_ON_DELAY_MASK, pps->t5));
 216
 217         I915_WRITE(PP_OFF_DELAYS(0),
 218                    REG_FIELD_PREP(PANEL_POWER_DOWN_DELAY_MASK, pps->t3) |
 219                    REG_FIELD_PREP(PANEL_LIGHT_OFF_DELAY_MASK, pps->tx));
 220
 221         I915_WRITE(PP_DIVISOR(0),
 222                    REG_FIELD_PREP(PP_REFERENCE_DIVIDER_MASK, pps->divider) |
 223                    REG_FIELD_PREP(PANEL_POWER_CYCLE_DELAY_MASK,
 224                                   DIV_ROUND_UP(pps->t4, 1000) + 1));
 225 }
 226
 227 static void intel_pre_enable_lvds(struct intel_encoder *encoder,
 228                                   const struct intel_crtc_state *pipe_config,
 229                                   const struct drm_connector_state *conn_state)
 230 {
 231         struct intel_lvds_encoder *lvds_encoder = to_lvds_encoder(&encoder->base);
 232         struct drm_i915_private *dev_priv = to_i915(encoder->base.dev);
 233         struct intel_crtc *crtc = to_intel_crtc(pipe_config->base.crtc);
 234         const struct drm_display_mode *adjusted_mode = &pipe_config->base.adjusted_mode;
 235         int pipe = crtc->pipe;
 236         u32 temp;
 237
 238         if (HAS_PCH_SPLIT(dev_priv)) {
 239                 assert_fdi_rx_pll_disabled(dev_priv, pipe);
 240                 assert_shared_dpll_disabled(dev_priv,
 241                                             pipe_config->shared_dpll);
 242         } else {
 243                 assert_pll_disabled(dev_priv, pipe);
 244         }
 245
 246         intel_lvds_pps_init_hw(dev_priv, &lvds_encoder->init_pps);
 247
 248         temp = lvds_encoder->init_lvds_val;
 249         temp |= LVDS_PORT_EN | LVDS_A0A2_CLKA_POWER_UP;
 250
 251         if (HAS_PCH_CPT(dev_priv)) {
 252                 temp &= ~LVDS_PIPE_SEL_MASK_CPT;
 253                 temp |= LVDS_PIPE_SEL_CPT(pipe);
 254         } else {
 255                 temp &= ~LVDS_PIPE_SEL_MASK;
 256                 temp |= LVDS_PIPE_SEL(pipe);
 257         }
 258
 259         /* set the corresponsding LVDS_BORDER bit */
 260         temp &= ~LVDS_BORDER_ENABLE;
 261         temp |= pipe_config->gmch_pfit.lvds_border_bits;
 262
 263         /*
 264          * Set the B0-B3 data pairs corresponding to whether we're going to
 265          * set the DPLLs for dual-channel mode or not.
 266          */
 267         if (lvds_encoder->is_dual_link)
 268                 temp |= LVDS_B0B3_POWER_UP | LVDS_CLKB_POWER_UP;
 269         else
 270                 temp &= ~(LVDS_B0B3_POWER_UP | LVDS_CLKB_POWER_UP);
 271
 272         /*
 273          * It would be nice to set 24 vs 18-bit mode (LVDS_A3_POWER_UP)
 274          * appropriately here, but we need to look more thoroughly into how
 275          * panels behave in the two modes. For now, let's just maintain the
 276          * value we got from the BIOS.
 277          */
 278         temp &= ~LVDS_A3_POWER_MASK;
 279         temp |= lvds_encoder->a3_power;
 280
 281         /*
 282          * Set the dithering flag on LVDS as needed, note that there is no
 283          * special lvds dither control bit on pch-split platforms, dithering is
 284          * only controlled through the PIPECONF reg.
 285          */
 286         if (IS_GEN(dev_priv, 4)) {
 287                 /*
 288                  * Bspec wording suggests that LVDS port dithering only exists
 289                  * for 18bpp panels.
 290                  */
 291                 if (pipe_config->dither && pipe_config->pipe_bpp == 18)
 292                         temp |= LVDS_ENABLE_DITHER;
 293                 else
 294                         temp &= ~LVDS_ENABLE_DITHER;
 295         }
 296         temp &= ~(LVDS_HSYNC_POLARITY | LVDS_VSYNC_POLARITY);
 297         if (adjusted_mode->flags & DRM_MODE_FLAG_NHSYNC)
 298                 temp |= LVDS_HSYNC_POLARITY;
 299         if (adjusted_mode->flags & DRM_MODE_FLAG_NVSYNC)
 300                 temp |= LVDS_VSYNC_POLARITY;
 301
 302         I915_WRITE(lvds_encoder->reg, temp);
 303 }
 304
 305 /*
 306  * Sets the power state for the panel.
 307  */
 308 static void intel_enable_lvds(struct intel_encoder *encoder,
 309                               const struct intel_crtc_state *pipe_config,
 310                               const struct drm_connector_state *conn_state)
 311 {
 312         struct drm_device *dev = encoder->base.dev;
 313         struct intel_lvds_encoder *lvds_encoder = to_lvds_encoder(&encoder->base);
 314         struct drm_i915_private *dev_priv = to_i915(dev);
 315
 316         I915_WRITE(lvds_encoder->reg, I915_READ(lvds_encoder->reg) | LVDS_PORT_EN);
 317
 318         I915_WRITE(PP_CONTROL(0), I915_READ(PP_CONTROL(0)) | PANEL_POWER_ON);
 319         POSTING_READ(lvds_encoder->reg);
 320
 321         if (intel_de_wait_for_set(dev_priv, PP_STATUS(0), PP_ON, 5000))
 322                 DRM_ERROR("timed out waiting for panel to power on\n");
 323
 324         intel_panel_enable_backlight(pipe_config, conn_state);
 325 }
 326
 327 static void intel_disable_lvds(struct intel_encoder *encoder,
 328                                const struct intel_crtc_state *old_crtc_state,
 329                                const struct drm_connector_state *old_conn_state)
 330 {
 331         struct intel_lvds_encoder *lvds_encoder = to_lvds_encoder(&encoder->base);
 332         struct drm_i915_private *dev_priv = to_i915(encoder->base.dev);
 333
 334         I915_WRITE(PP_CONTROL(0), I915_READ(PP_CONTROL(0)) & ~PANEL_POWER_ON);
 335         if (intel_de_wait_for_clear(dev_priv, PP_STATUS(0), PP_ON, 1000))
 336                 DRM_ERROR("timed out waiting for panel to power off\n");
 337
 338         I915_WRITE(lvds_encoder->reg, I915_READ(lvds_encoder->reg) & ~LVDS_PORT_EN);
 339         POSTING_READ(lvds_encoder->reg);
 340 }
 341
 342 static void gmch_disable_lvds(struct intel_encoder *encoder,
 343                               const struct intel_crtc_state *old_crtc_state,
 344                               const struct drm_connector_state *old_conn_state)
 345
 346 {
 347         intel_panel_disable_backlight(old_conn_state);
 348
 349         intel_disable_lvds(encoder, old_crtc_state, old_conn_state);
 350 }
 351
 352 static void pch_disable_lvds(struct intel_encoder *encoder,
 353                              const struct intel_crtc_state *old_crtc_state,
 354                              const struct drm_connector_state *old_conn_state)
 355 {
 356         intel_panel_disable_backlight(old_conn_state);
 357 }
 358
 359 static void pch_post_disable_lvds(struct intel_encoder *encoder,
 360                                   const struct intel_crtc_state *old_crtc_state,
 361                                   const struct drm_connector_state *old_conn_state)
 362 {
 363         intel_disable_lvds(encoder, old_crtc_state, old_conn_state);
 364 }
 365
 366 static enum drm_mode_status
 367 intel_lvds_mode_valid(struct drm_connector *connector,
 368                       struct drm_display_mode *mode)
 369 {
 370         struct intel_connector *intel_connector = to_intel_connector(connector);
 371         struct drm_display_mode *fixed_mode = intel_connector->panel.fixed_mode;
 372         int max_pixclk = to_i915(connector->dev)->max_dotclk_freq;
 373
 374         if (mode->flags & DRM_MODE_FLAG_DBLSCAN)
 375                 return MODE_NO_DBLESCAN;
 376         if (mode->hdisplay > fixed_mode->hdisplay)
 377                 return MODE_PANEL;
 378         if (mode->vdisplay > fixed_mode->vdisplay)
 379                 return MODE_PANEL;
 380         if (fixed_mode->clock > max_pixclk)
 381                 return MODE_CLOCK_HIGH;
 382
 383         return MODE_OK;
 384 }
 385
 386 static int intel_lvds_compute_config(struct intel_encoder *intel_encoder,
 387                                      struct intel_crtc_state *pipe_config,
 388                                      struct drm_connector_state *conn_state)
 389 {
 390         struct drm_i915_private *dev_priv = to_i915(intel_encoder->base.dev);
 391         struct intel_lvds_encoder *lvds_encoder =
 392                 to_lvds_encoder(&intel_encoder->base);
 393         struct intel_connector *intel_connector =
 394                 lvds_encoder->attached_connector;
 395         struct drm_display_mode *adjusted_mode = &pipe_config->base.adjusted_mode;
 396         struct intel_crtc *intel_crtc = to_intel_crtc(pipe_config->base.crtc);
 397         unsigned int lvds_bpp;
 398
 399         /* Should never happen!! */
 400         if (INTEL_GEN(dev_priv) < 4 && intel_crtc->pipe == 0) {
 401                 DRM_ERROR("Can't support LVDS on pipe A\n");
 402                 return -EINVAL;
 403         }
 404
 405         if (lvds_encoder->a3_power == LVDS_A3_POWER_UP)
 406                 lvds_bpp = 8*3;
 407         else
 408                 lvds_bpp = 6*3;
 409
 410         if (lvds_bpp != pipe_config->pipe_bpp && !pipe_config->bw_constrained) {
 411                 DRM_DEBUG_KMS("forcing display bpp (was %d) to LVDS (%d)\n",
 412                               pipe_config->pipe_bpp, lvds_bpp);
 413                 pipe_config->pipe_bpp = lvds_bpp;
 414         }
 415
 416         pipe_config->output_format = INTEL_OUTPUT_FORMAT_RGB;
 417
 418         /*
 419          * We have timings from the BIOS for the panel, put them in
 420          * to the adjusted mode.  The CRTC will be set up for this mode,
 421          * with the panel scaling set up to source from the H/VDisplay
 422          * of the original mode.
 423          */
 424         intel_fixed_panel_mode(intel_connector->panel.fixed_mode,
 425                                adjusted_mode);
 426
 427         if (adjusted_mode->flags & DRM_MODE_FLAG_DBLSCAN)
 428                 return -EINVAL;
 429
 430         if (HAS_PCH_SPLIT(dev_priv)) {
 431                 pipe_config->has_pch_encoder = true;
 432
 433                 intel_pch_panel_fitting(intel_crtc, pipe_config,
 434                                         conn_state->scaling_mode);
 435         } else {
 436                 intel_gmch_panel_fitting(intel_crtc, pipe_config,
 437                                          conn_state->scaling_mode);
 438
 439         }
 440
 441         /*
 442          * XXX: It would be nice to support lower refresh rates on the
 443          * panels to reduce power consumption, and perhaps match the
 444          * user's requested refresh rate.
 445          */
 446
 447         return 0;
 448 }
 449
 450 static enum drm_connector_status
 451 intel_lvds_detect(struct drm_connector *connector, bool force)
 452 {
 453         return connector_status_connected;
 454 }
 455
 456 /*
 457  * Return the list of DDC modes if available, or the BIOS fixed mode otherwise.
 458  */
 459 static int intel_lvds_get_modes(struct drm_connector *connector)
 460 {
 461         struct intel_connector *intel_connector = to_intel_connector(connector);
 462         struct drm_device *dev = connector->dev;
 463         struct drm_display_mode *mode;
 464
 465         /* use cached edid if we have one */
 466         if (!IS_ERR_OR_NULL(intel_connector->edid))
 467                 return drm_add_edid_modes(connector, intel_connector->edid);
 468
 469         mode = drm_mode_duplicate(dev, intel_connector->panel.fixed_mode);
 470         if (mode == NULL)
 471                 return 0;
 472
 473         drm_mode_probed_add(connector, mode);
 474         return 1;
 475 }
 476
 477 static const struct drm_connector_helper_funcs intel_lvds_connector_helper_funcs = {
 478         .get_modes = intel_lvds_get_modes,
 479         .mode_valid = intel_lvds_mode_valid,
 480         .atomic_check = intel_digital_connector_atomic_check,
 481 };
 482
 483 static const struct drm_connector_funcs intel_lvds_connector_funcs = {
 484         .detect = intel_lvds_detect,
 485         .fill_modes = drm_helper_probe_single_connector_modes,
 486         .atomic_get_property = intel_digital_connector_atomic_get_property,
 487         .atomic_set_property = intel_digital_connector_atomic_set_property,
 488         .late_register = intel_connector_register,
 489         .early_unregister = intel_connector_unregister,
 490         .destroy = intel_connector_destroy,
 491         .atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
 492         .atomic_duplicate_state = intel_digital_connector_duplicate_state,
 493 };
 494
 495 static const struct drm_encoder_funcs intel_lvds_enc_funcs = {
 496         .destroy = intel_encoder_destroy,
 497 };
 498
 499 static int intel_no_lvds_dmi_callback(const struct dmi_system_id *id)
 500 {
 501         DRM_INFO("Skipping LVDS initialization for %s\n", id->ident);
 502         return 1;
 503 }
 504
 505 /* These systems claim to have LVDS, but really don't */
 506 static const struct dmi_system_id intel_no_lvds[] = {
 507         {
 508                 .callback = intel_no_lvds_dmi_callback,
 509                 .ident = "Apple Mac Mini (Core series)",
 510                 .matches = {
 511                         DMI_MATCH(DMI_SYS_VENDOR, "Apple"),
 512                         DMI_MATCH(DMI_PRODUCT_NAME, "Macmini1,1"),
 513                 },
 514         },
 515         {
 516                 .callback = intel_no_lvds_dmi_callback,
 517                 .ident = "Apple Mac Mini (Core 2 series)",
 518                 .matches = {
 519                         DMI_MATCH(DMI_SYS_VENDOR, "Apple"),
 520                         DMI_MATCH(DMI_PRODUCT_NAME, "Macmini2,1"),
 521                 },
 522         },
 523         {
 524                 .callback = intel_no_lvds_dmi_callback,
 525                 .ident = "MSI IM-945GSE-A",
 526                 .matches = {
 527                         DMI_MATCH(DMI_SYS_VENDOR, "MSI"),
 528                         DMI_MATCH(DMI_PRODUCT_NAME, "A9830IMS"),
 529                 },
 530         },
 531         {
 532                 .callback = intel_no_lvds_dmi_callback,
 533                 .ident = "Dell Studio Hybrid",
 534                 .matches = {
 535                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 536                         DMI_MATCH(DMI_PRODUCT_NAME, "Studio Hybrid 140g"),
 537                 },
 538         },
 539         {
 540                 .callback = intel_no_lvds_dmi_callback,
 541                 .ident = "Dell OptiPlex FX170",
 542                 .matches = {
 543                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 544                         DMI_MATCH(DMI_PRODUCT_NAME, "OptiPlex FX170"),
 545                 },
 546         },
 547         {
 548                 .callback = intel_no_lvds_dmi_callback,
 549                 .ident = "AOpen Mini PC",
 550                 .matches = {
 551                         DMI_MATCH(DMI_SYS_VENDOR, "AOpen"),
 552                         DMI_MATCH(DMI_PRODUCT_NAME, "i965GMx-IF"),
 553                 },
 554         },
 555         {
 556                 .callback = intel_no_lvds_dmi_callback,
 557                 .ident = "AOpen Mini PC MP915",
 558                 .matches = {
 559                         DMI_MATCH(DMI_BOARD_VENDOR, "AOpen"),
 560                         DMI_MATCH(DMI_BOARD_NAME, "i915GMx-F"),
 561                 },
 562         },
 563         {
 564                 .callback = intel_no_lvds_dmi_callback,
 565                 .ident = "AOpen i915GMm-HFS",
 566                 .matches = {
 567                         DMI_MATCH(DMI_BOARD_VENDOR, "AOpen"),
 568                         DMI_MATCH(DMI_BOARD_NAME, "i915GMm-HFS"),
 569                 },
 570         },
 571         {
 572                 .callback = intel_no_lvds_dmi_callback,
 573                 .ident = "AOpen i45GMx-I",
 574                 .matches = {
 575                         DMI_MATCH(DMI_BOARD_VENDOR, "AOpen"),
 576                         DMI_MATCH(DMI_BOARD_NAME, "i45GMx-I"),
 577                 },
 578         },
 579         {
 580                 .callback = intel_no_lvds_dmi_callback,
 581                 .ident = "Aopen i945GTt-VFA",
 582                 .matches = {
 583                         DMI_MATCH(DMI_PRODUCT_VERSION, "AO00001JW"),
 584                 },
 585         },
 586         {
 587                 .callback = intel_no_lvds_dmi_callback,
 588                 .ident = "Clientron U800",
 589                 .matches = {
 590                         DMI_MATCH(DMI_SYS_VENDOR, "Clientron"),
 591                         DMI_MATCH(DMI_PRODUCT_NAME, "U800"),
 592                 },
 593         },
 594         {
 595                 .callback = intel_no_lvds_dmi_callback,
 596                 .ident = "Clientron E830",
 597                 .matches = {
 598                         DMI_MATCH(DMI_SYS_VENDOR, "Clientron"),
 599                         DMI_MATCH(DMI_PRODUCT_NAME, "E830"),
 600                 },
 601         },
 602         {
 603                 .callback = intel_no_lvds_dmi_callback,
 604                 .ident = "Asus EeeBox PC EB1007",
 605                 .matches = {
 606                         DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK Computer INC."),
 607                         DMI_MATCH(DMI_PRODUCT_NAME, "EB1007"),
 608                 },
 609         },
 610         {
 611                 .callback = intel_no_lvds_dmi_callback,
 612                 .ident = "Asus AT5NM10T-I",
 613                 .matches = {
 614                         DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer INC."),
 615                         DMI_MATCH(DMI_BOARD_NAME, "AT5NM10T-I"),
 616                 },
 617         },
 618         {
 619                 .callback = intel_no_lvds_dmi_callback,
 620                 .ident = "Hewlett-Packard HP t5740",
 621                 .matches = {
 622                         DMI_MATCH(DMI_BOARD_VENDOR, "Hewlett-Packard"),
 623                         DMI_MATCH(DMI_PRODUCT_NAME, " t5740"),
 624                 },
 625         },
 626         {
 627                 .callback = intel_no_lvds_dmi_callback,
 628                 .ident = "Hewlett-Packard t5745",
 629                 .matches = {
 630                         DMI_MATCH(DMI_BOARD_VENDOR, "Hewlett-Packard"),
 631                         DMI_MATCH(DMI_PRODUCT_NAME, "hp t5745"),
 632                 },
 633         },
 634         {
 635                 .callback = intel_no_lvds_dmi_callback,
 636                 .ident = "Hewlett-Packard st5747",
 637                 .matches = {
 638                         DMI_MATCH(DMI_BOARD_VENDOR, "Hewlett-Packard"),
 639                         DMI_MATCH(DMI_PRODUCT_NAME, "hp st5747"),
 640                 },
 641         },
 642         {
 643                 .callback = intel_no_lvds_dmi_callback,
 644                 .ident = "MSI Wind Box DC500",
 645                 .matches = {
 646                         DMI_MATCH(DMI_BOARD_VENDOR, "MICRO-STAR INTERNATIONAL CO., LTD"),
 647                         DMI_MATCH(DMI_BOARD_NAME, "MS-7469"),
 648                 },
 649         },
 650         {
 651                 .callback = intel_no_lvds_dmi_callback,
 652                 .ident = "Gigabyte GA-D525TUD",
 653                 .matches = {
 654                         DMI_MATCH(DMI_BOARD_VENDOR, "Gigabyte Technology Co., Ltd."),
 655                         DMI_MATCH(DMI_BOARD_NAME, "D525TUD"),
 656                 },
 657         },
 658         {
 659                 .callback = intel_no_lvds_dmi_callback,
 660                 .ident = "Supermicro X7SPA-H",
 661                 .matches = {
 662                         DMI_MATCH(DMI_SYS_VENDOR, "Supermicro"),
 663                         DMI_MATCH(DMI_PRODUCT_NAME, "X7SPA-H"),
 664                 },
 665         },
 666         {
 667                 .callback = intel_no_lvds_dmi_callback,
 668                 .ident = "Fujitsu Esprimo Q900",
 669                 .matches = {
 670                         DMI_MATCH(DMI_SYS_VENDOR, "FUJITSU"),
 671                         DMI_MATCH(DMI_PRODUCT_NAME, "ESPRIMO Q900"),
 672                 },
 673         },
 674         {
 675                 .callback = intel_no_lvds_dmi_callback,
 676                 .ident = "Intel D410PT",
 677                 .matches = {
 678                         DMI_MATCH(DMI_BOARD_VENDOR, "Intel"),
 679                         DMI_MATCH(DMI_BOARD_NAME, "D410PT"),
 680                 },
 681         },
 682         {
 683                 .callback = intel_no_lvds_dmi_callback,
 684                 .ident = "Intel D425KT",
 685                 .matches = {
 686                         DMI_MATCH(DMI_BOARD_VENDOR, "Intel"),
 687                         DMI_EXACT_MATCH(DMI_BOARD_NAME, "D425KT"),
 688                 },
 689         },
 690         {
 691                 .callback = intel_no_lvds_dmi_callback,
 692                 .ident = "Intel D510MO",
 693                 .matches = {
 694                         DMI_MATCH(DMI_BOARD_VENDOR, "Intel"),
 695                         DMI_EXACT_MATCH(DMI_BOARD_NAME, "D510MO"),
 696                 },
 697         },
 698         {
 699                 .callback = intel_no_lvds_dmi_callback,
 700                 .ident = "Intel D525MW",
 701                 .matches = {
 702                         DMI_MATCH(DMI_BOARD_VENDOR, "Intel"),
 703                         DMI_EXACT_MATCH(DMI_BOARD_NAME, "D525MW"),
 704                 },
 705         },
 706         {
 707                 .callback = intel_no_lvds_dmi_callback,
 708                 .ident = "Radiant P845",
 709                 .matches = {
 710                         DMI_MATCH(DMI_SYS_VENDOR, "Radiant Systems Inc"),
 711                         DMI_MATCH(DMI_PRODUCT_NAME, "P845"),
 712                 },
 713         },
 714
 715         { }     /* terminating entry */
 716 };
 717
 718 static int intel_dual_link_lvds_callback(const struct dmi_system_id *id)
 719 {
 720         DRM_INFO("Forcing lvds to dual link mode on %s\n", id->ident);
 721         return 1;
 722 }
 723
 724 static const struct dmi_system_id intel_dual_link_lvds[] = {
 725         {
 726                 .callback = intel_dual_link_lvds_callback,
 727                 .ident = "Apple MacBook Pro 15\" (2010)",
 728                 .matches = {
 729                         DMI_MATCH(DMI_SYS_VENDOR, "Apple Inc."),
 730                         DMI_MATCH(DMI_PRODUCT_NAME, "MacBookPro6,2"),
 731                 },
 732         },
 733         {
 734                 .callback = intel_dual_link_lvds_callback,
 735                 .ident = "Apple MacBook Pro 15\" (2011)",
 736                 .matches = {
 737                         DMI_MATCH(DMI_SYS_VENDOR, "Apple Inc."),
 738                         DMI_MATCH(DMI_PRODUCT_NAME, "MacBookPro8,2"),
 739                 },
 740         },
 741         {
 742                 .callback = intel_dual_link_lvds_callback,
 743                 .ident = "Apple MacBook Pro 15\" (2012)",
 744                 .matches = {
 745                         DMI_MATCH(DMI_SYS_VENDOR, "Apple Inc."),
 746                         DMI_MATCH(DMI_PRODUCT_NAME, "MacBookPro9,1"),
 747                 },
 748         },
 749         { }     /* terminating entry */
 750 };
 751
 752 struct intel_encoder *intel_get_lvds_encoder(struct drm_i915_private *dev_priv)
 753 {
 754         struct intel_encoder *encoder;
 755
 756         for_each_intel_encoder(&dev_priv->drm, encoder) {
 757                 if (encoder->type == INTEL_OUTPUT_LVDS)
 758                         return encoder;
 759         }
 760
 761         return NULL;
 762 }
 763
 764 bool intel_is_dual_link_lvds(struct drm_i915_private *dev_priv)
 765 {
 766         struct intel_encoder *encoder = intel_get_lvds_encoder(dev_priv);
 767
 768         return encoder && to_lvds_encoder(&encoder->base)->is_dual_link;
 769 }
 770
 771 static bool compute_is_dual_link_lvds(struct intel_lvds_encoder *lvds_encoder)
 772 {
 773         struct drm_device *dev = lvds_encoder->base.base.dev;
 774         unsigned int val;
 775         struct drm_i915_private *dev_priv = to_i915(dev);
 776
 777         /* use the module option value if specified */
 778         if (i915_modparams.lvds_channel_mode > 0)
 779                 return i915_modparams.lvds_channel_mode == 2;
 780
 781         /* single channel LVDS is limited to 112 MHz */
 782         if (lvds_encoder->attached_connector->panel.fixed_mode->clock > 112999)
 783                 return true;
 784
 785         if (dmi_check_system(intel_dual_link_lvds))
 786                 return true;
 787
 788         /*
 789          * BIOS should set the proper LVDS register value at boot, but
 790          * in reality, it doesn't set the value when the lid is closed;
 791          * we need to check "the value to be set" in VBT when LVDS
 792          * register is uninitialized.
 793          */
 794         val = I915_READ(lvds_encoder->reg);
 795         if (HAS_PCH_CPT(dev_priv))
 796                 val &= ~(LVDS_DETECTED | LVDS_PIPE_SEL_MASK_CPT);
 797         else
 798                 val &= ~(LVDS_DETECTED | LVDS_PIPE_SEL_MASK);
 799         if (val == 0)
 800                 val = dev_priv->vbt.bios_lvds_val;
 801
 802         return (val & LVDS_CLKB_POWER_MASK) == LVDS_CLKB_POWER_UP;
 803 }
 804
 805 /**
 806  * intel_lvds_init - setup LVDS connectors on this device
 807  * @dev_priv: i915 device
 808  *
 809  * Create the connector, register the LVDS DDC bus, and try to figure out what
 810  * modes we can display on the LVDS panel (if present).
 811  */
 812 void intel_lvds_init(struct drm_i915_private *dev_priv)
 813 {
 814         struct drm_device *dev = &dev_priv->drm;
 815         struct intel_lvds_encoder *lvds_encoder;
 816         struct intel_encoder *intel_encoder;
 817         struct intel_connector *intel_connector;
 818         struct drm_connector *connector;
 819         struct drm_encoder *encoder;
 820         struct drm_display_mode *fixed_mode = NULL;
 821         struct drm_display_mode *downclock_mode = NULL;
 822         struct edid *edid;
 823         i915_reg_t lvds_reg;
 824         u32 lvds;
 825         u8 pin;
 826         u32 allowed_scalers;
 827
 828         /* Skip init on machines we know falsely report LVDS */
 829         if (dmi_check_system(intel_no_lvds)) {
 830                 WARN(!dev_priv->vbt.int_lvds_support,
 831                      "Useless DMI match. Internal LVDS support disabled by VBT\n");
 832                 return;
 833         }
 834
 835         if (!dev_priv->vbt.int_lvds_support) {
 836                 DRM_DEBUG_KMS("Internal LVDS support disabled by VBT\n");
 837                 return;
 838         }
 839
 840         if (HAS_PCH_SPLIT(dev_priv))
 841                 lvds_reg = PCH_LVDS;
 842         else
 843                 lvds_reg = LVDS;
 844
 845         lvds = I915_READ(lvds_reg);
 846
 847         if (HAS_PCH_SPLIT(dev_priv)) {
 848                 if ((lvds & LVDS_DETECTED) == 0)
 849                         return;
 850         }
 851
 852         pin = GMBUS_PIN_PANEL;
 853         if (!intel_bios_is_lvds_present(dev_priv, &pin)) {
 854                 if ((lvds & LVDS_PORT_EN) == 0) {
 855                         DRM_DEBUG_KMS("LVDS is not present in VBT\n");
 856                         return;
 857                 }
 858                 DRM_DEBUG_KMS("LVDS is not present in VBT, but enabled anyway\n");
 859         }
 860
 861         lvds_encoder = kzalloc(sizeof(*lvds_encoder), GFP_KERNEL);
 862         if (!lvds_encoder)
 863                 return;
 864
 865         intel_connector = intel_connector_alloc();
 866         if (!intel_connector) {
 867                 kfree(lvds_encoder);
 868                 return;
 869         }
 870
 871         lvds_encoder->attached_connector = intel_connector;
 872
 873         intel_encoder = &lvds_encoder->base;
 874         encoder = &intel_encoder->base;
 875         connector = &intel_connector->base;
 876         drm_connector_init(dev, &intel_connector->base, &intel_lvds_connector_funcs,
 877                            DRM_MODE_CONNECTOR_LVDS);
 878
 879         drm_encoder_init(dev, &intel_encoder->base, &intel_lvds_enc_funcs,
 880                          DRM_MODE_ENCODER_LVDS, "LVDS");
 881
 882         intel_encoder->enable = intel_enable_lvds;
 883         intel_encoder->pre_enable = intel_pre_enable_lvds;
 884         intel_encoder->compute_config = intel_lvds_compute_config;
 885         if (HAS_PCH_SPLIT(dev_priv)) {
 886                 intel_encoder->disable = pch_disable_lvds;
 887                 intel_encoder->post_disable = pch_post_disable_lvds;
 888         } else {
 889                 intel_encoder->disable = gmch_disable_lvds;
 890         }
 891         intel_encoder->get_hw_state = intel_lvds_get_hw_state;
 892         intel_encoder->get_config = intel_lvds_get_config;
 893         intel_encoder->update_pipe = intel_panel_update_backlight;
 894         intel_connector->get_hw_state = intel_connector_get_hw_state;
 895
 896         intel_connector_attach_encoder(intel_connector, intel_encoder);
 897
 898         intel_encoder->type = INTEL_OUTPUT_LVDS;
 899         intel_encoder->power_domain = POWER_DOMAIN_PORT_OTHER;
 900         intel_encoder->port = PORT_NONE;
 901         intel_encoder->cloneable = 0;
 902         if (HAS_PCH_SPLIT(dev_priv))
 903                 intel_encoder->crtc_mask = (1 << 0) | (1 << 1) | (1 << 2);
 904         else if (IS_GEN(dev_priv, 4))
 905                 intel_encoder->crtc_mask = (1 << 0) | (1 << 1);
 906         else
 907                 intel_encoder->crtc_mask = (1 << 1);
 908
 909         drm_connector_helper_add(connector, &intel_lvds_connector_helper_funcs);
 910         connector->display_info.subpixel_order = SubPixelHorizontalRGB;
 911         connector->interlace_allowed = false;
 912         connector->doublescan_allowed = false;
 913
 914         lvds_encoder->reg = lvds_reg;
 915
 916         /* create the scaling mode property */
 917         allowed_scalers = BIT(DRM_MODE_SCALE_ASPECT);
 918         allowed_scalers |= BIT(DRM_MODE_SCALE_FULLSCREEN);
 919         allowed_scalers |= BIT(DRM_MODE_SCALE_CENTER);
 920         drm_connector_attach_scaling_mode_property(connector, allowed_scalers);
 921         connector->state->scaling_mode = DRM_MODE_SCALE_ASPECT;
 922
 923         intel_lvds_pps_get_hw_state(dev_priv, &lvds_encoder->init_pps);
 924         lvds_encoder->init_lvds_val = lvds;
 925
 926         /*
 927          * LVDS discovery:
 928          * 1) check for EDID on DDC
 929          * 2) check for VBT data
 930          * 3) check to see if LVDS is already on
 931          *    if none of the above, no panel
 932          */
 933
 934         /*
 935          * Attempt to get the fixed panel mode from DDC.  Assume that the
 936          * preferred mode is the right one.
 937          */
 938         mutex_lock(&dev->mode_config.mutex);
 939         if (vga_switcheroo_handler_flags() & VGA_SWITCHEROO_CAN_SWITCH_DDC)
 940                 edid = drm_get_edid_switcheroo(connector,
 941                                     intel_gmbus_get_adapter(dev_priv, pin));
 942         else
 943                 edid = drm_get_edid(connector,
 944                                     intel_gmbus_get_adapter(dev_priv, pin));
 945         if (edid) {
 946                 if (drm_add_edid_modes(connector, edid)) {
 947                         drm_connector_update_edid_property(connector,
 948                                                                 edid);
 949                 } else {
 950                         kfree(edid);
 951                         edid = ERR_PTR(-EINVAL);
 952                 }
 953         } else {
 954                 edid = ERR_PTR(-ENOENT);
 955         }
 956         intel_connector->edid = edid;
 957
 958         fixed_mode = intel_panel_edid_fixed_mode(intel_connector);
 959         if (fixed_mode)
 960                 goto out;
 961
 962         /* Failed to get EDID, what about VBT? */
 963         fixed_mode = intel_panel_vbt_fixed_mode(intel_connector);
 964         if (fixed_mode)
 965                 goto out;
 966
 967         /*
 968          * If we didn't get EDID, try checking if the panel is already turned
 969          * on.  If so, assume that whatever is currently programmed is the
 970          * correct mode.
 971          */
 972         fixed_mode = intel_encoder_current_mode(intel_encoder);
 973         if (fixed_mode) {
 974                 DRM_DEBUG_KMS("using current (BIOS) mode: ");
 975                 drm_mode_debug_printmodeline(fixed_mode);
 976                 fixed_mode->type |= DRM_MODE_TYPE_PREFERRED;
 977         }
 978
 979         /* If we still don't have a mode after all that, give up. */
 980         if (!fixed_mode)
 981                 goto failed;
 982
 983 out:
 984         mutex_unlock(&dev->mode_config.mutex);
 985
 986         intel_panel_init(&intel_connector->panel, fixed_mode, downclock_mode);
 987         intel_panel_setup_backlight(connector, INVALID_PIPE);
 988
 989         lvds_encoder->is_dual_link = compute_is_dual_link_lvds(lvds_encoder);
 990         DRM_DEBUG_KMS("detected %s-link lvds configuration\n",
 991                       lvds_encoder->is_dual_link ? "dual" : "single");
 992
 993         lvds_encoder->a3_power = lvds & LVDS_A3_POWER_MASK;
 994
 995         return;
 996
 997 failed:
 998         mutex_unlock(&dev->mode_config.mutex);
 999
1000         DRM_DEBUG_KMS("No LVDS modes found, disabling.\n");
1001         drm_connector_cleanup(connector);
1002         drm_encoder_cleanup(encoder);
1003         kfree(lvds_encoder);
1004         intel_connector_free(intel_connector);
1005         return;
1006 }