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
  41 #include "i915_drv.h"
  42 #include "intel_atomic.h"
  43 #include "intel_connector.h"
  44 #include "intel_display_types.h"
  45 #include "intel_gmbus.h"
  46 #include "intel_lvds.h"
  47 #include "intel_panel.h"
  48
  49 /* Private structure for the integrated LVDS support */
  50 struct intel_lvds_pps {
  51         /* 100us units */
  52         int t1_t2;
  53         int t3;
  54         int t4;
  55         int t5;
  56         int tx;
  57
  58         int divider;
  59
  60         int port;
  61         bool powerdown_on_reset;
  62 };
  63
  64 struct intel_lvds_encoder {
  65         struct intel_encoder base;
  66
  67         bool is_dual_link;
  68         i915_reg_t reg;
  69         u32 a3_power;
  70
  71         struct intel_lvds_pps init_pps;
  72         u32 init_lvds_val;
  73
  74         struct intel_connector *attached_connector;
  75 };
  76
  77 static struct intel_lvds_encoder *to_lvds_encoder(struct drm_encoder *encoder)
  78 {
  79         return container_of(encoder, struct intel_lvds_encoder, base.base);
  80 }
  81
  82 bool intel_lvds_port_enabled(struct drm_i915_private *dev_priv,
  83                              i915_reg_t lvds_reg, enum pipe *pipe)
  84 {
  85         u32 val;
  86
  87         val = intel_de_read(dev_priv, lvds_reg);
  88
  89         /* asserts want to know the pipe even if the port is disabled */
  90         if (HAS_PCH_CPT(dev_priv))
  91                 *pipe = (val & LVDS_PIPE_SEL_MASK_CPT) >> LVDS_PIPE_SEL_SHIFT_CPT;
  92         else
  93                 *pipe = (val & LVDS_PIPE_SEL_MASK) >> LVDS_PIPE_SEL_SHIFT;
  94
  95         return val & LVDS_PORT_EN;
  96 }
  97
  98 static bool intel_lvds_get_hw_state(struct intel_encoder *encoder,
  99                                     enum pipe *pipe)
 100 {
 101         struct drm_i915_private *dev_priv = to_i915(encoder->base.dev);
 102         struct intel_lvds_encoder *lvds_encoder = to_lvds_encoder(&encoder->base);
 103         intel_wakeref_t wakeref;
 104         bool ret;
 105
 106         wakeref = intel_display_power_get_if_enabled(dev_priv,
 107                                                      encoder->power_domain);
 108         if (!wakeref)
 109                 return false;
 110
 111         ret = intel_lvds_port_enabled(dev_priv, lvds_encoder->reg, pipe);
 112
 113         intel_display_power_put(dev_priv, encoder->power_domain, wakeref);
 114
 115         return ret;
 116 }
 117
 118 static void intel_lvds_get_config(struct intel_encoder *encoder,
 119                                   struct intel_crtc_state *pipe_config)
 120 {
 121         struct drm_i915_private *dev_priv = to_i915(encoder->base.dev);
 122         struct intel_lvds_encoder *lvds_encoder = to_lvds_encoder(&encoder->base);
 123         u32 tmp, flags = 0;
 124
 125         pipe_config->output_types |= BIT(INTEL_OUTPUT_LVDS);
 126
 127         tmp = intel_de_read(dev_priv, lvds_encoder->reg);
 128         if (tmp & LVDS_HSYNC_POLARITY)
 129                 flags |= DRM_MODE_FLAG_NHSYNC;
 130         else
 131                 flags |= DRM_MODE_FLAG_PHSYNC;
 132         if (tmp & LVDS_VSYNC_POLARITY)
 133                 flags |= DRM_MODE_FLAG_NVSYNC;
 134         else
 135                 flags |= DRM_MODE_FLAG_PVSYNC;
 136
 137         pipe_config->hw.adjusted_mode.flags |= flags;
 138
 139         if (INTEL_GEN(dev_priv) < 5)
 140                 pipe_config->gmch_pfit.lvds_border_bits =
 141                         tmp & LVDS_BORDER_ENABLE;
 142
 143         /* gen2/3 store dither state in pfit control, needs to match */
 144         if (INTEL_GEN(dev_priv) < 4) {
 145                 tmp = intel_de_read(dev_priv, PFIT_CONTROL);
 146
 147                 pipe_config->gmch_pfit.control |= tmp & PANEL_8TO6_DITHER_ENABLE;
 148         }
 149
 150         pipe_config->hw.adjusted_mode.crtc_clock = pipe_config->port_clock;
 151 }
 152
 153 static void intel_lvds_pps_get_hw_state(struct drm_i915_private *dev_priv,
 154                                         struct intel_lvds_pps *pps)
 155 {
 156         u32 val;
 157
 158         pps->powerdown_on_reset = intel_de_read(dev_priv, PP_CONTROL(0)) & PANEL_POWER_RESET;
 159
 160         val = intel_de_read(dev_priv, PP_ON_DELAYS(0));
 161         pps->port = REG_FIELD_GET(PANEL_PORT_SELECT_MASK, val);
 162         pps->t1_t2 = REG_FIELD_GET(PANEL_POWER_UP_DELAY_MASK, val);
 163         pps->t5 = REG_FIELD_GET(PANEL_LIGHT_ON_DELAY_MASK, val);
 164
 165         val = intel_de_read(dev_priv, PP_OFF_DELAYS(0));
 166         pps->t3 = REG_FIELD_GET(PANEL_POWER_DOWN_DELAY_MASK, val);
 167         pps->tx = REG_FIELD_GET(PANEL_LIGHT_OFF_DELAY_MASK, val);
 168
 169         val = intel_de_read(dev_priv, PP_DIVISOR(0));
 170         pps->divider = REG_FIELD_GET(PP_REFERENCE_DIVIDER_MASK, val);
 171         val = REG_FIELD_GET(PANEL_POWER_CYCLE_DELAY_MASK, val);
 172         /*
 173          * Remove the BSpec specified +1 (100ms) offset that accounts for a
 174          * too short power-cycle delay due to the asynchronous programming of
 175          * the register.
 176          */
 177         if (val)
 178                 val--;
 179         /* Convert from 100ms to 100us units */
 180         pps->t4 = val * 1000;
 181
 182         if (INTEL_GEN(dev_priv) <= 4 &&
 183             pps->t1_t2 == 0 && pps->t5 == 0 && pps->t3 == 0 && pps->tx == 0) {
 184                 drm_dbg_kms(&dev_priv->drm,
 185                             "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_dbg(&dev_priv->drm, "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 = intel_de_read(dev_priv, PP_CONTROL(0));
 207         drm_WARN_ON(&dev_priv->drm,
 208                     (val & PANEL_UNLOCK_MASK) != PANEL_UNLOCK_REGS);
 209         if (pps->powerdown_on_reset)
 210                 val |= PANEL_POWER_RESET;
 211         intel_de_write(dev_priv, PP_CONTROL(0), val);
 212
 213         intel_de_write(dev_priv, PP_ON_DELAYS(0),
 214                        REG_FIELD_PREP(PANEL_PORT_SELECT_MASK, pps->port) | REG_FIELD_PREP(PANEL_POWER_UP_DELAY_MASK, pps->t1_t2) | REG_FIELD_PREP(PANEL_LIGHT_ON_DELAY_MASK, pps->t5));
 215
 216         intel_de_write(dev_priv, PP_OFF_DELAYS(0),
 217                        REG_FIELD_PREP(PANEL_POWER_DOWN_DELAY_MASK, pps->t3) | REG_FIELD_PREP(PANEL_LIGHT_OFF_DELAY_MASK, pps->tx));
 218
 219         intel_de_write(dev_priv, PP_DIVISOR(0),
 220                        REG_FIELD_PREP(PP_REFERENCE_DIVIDER_MASK, pps->divider) | REG_FIELD_PREP(PANEL_POWER_CYCLE_DELAY_MASK, DIV_ROUND_UP(pps->t4, 1000) + 1));
 221 }
 222
 223 static void intel_pre_enable_lvds(struct intel_atomic_state *state,
 224                                   struct intel_encoder *encoder,
 225                                   const struct intel_crtc_state *pipe_config,
 226                                   const struct drm_connector_state *conn_state)
 227 {
 228         struct intel_lvds_encoder *lvds_encoder = to_lvds_encoder(&encoder->base);
 229         struct drm_i915_private *dev_priv = to_i915(encoder->base.dev);
 230         struct intel_crtc *crtc = to_intel_crtc(pipe_config->uapi.crtc);
 231         const struct drm_display_mode *adjusted_mode = &pipe_config->hw.adjusted_mode;
 232         enum pipe pipe = crtc->pipe;
 233         u32 temp;
 234
 235         if (HAS_PCH_SPLIT(dev_priv)) {
 236                 assert_fdi_rx_pll_disabled(dev_priv, pipe);
 237                 assert_shared_dpll_disabled(dev_priv,
 238                                             pipe_config->shared_dpll);
 239         } else {
 240                 assert_pll_disabled(dev_priv, pipe);
 241         }
 242
 243         intel_lvds_pps_init_hw(dev_priv, &lvds_encoder->init_pps);
 244
 245         temp = lvds_encoder->init_lvds_val;
 246         temp |= LVDS_PORT_EN | LVDS_A0A2_CLKA_POWER_UP;
 247
 248         if (HAS_PCH_CPT(dev_priv)) {
 249                 temp &= ~LVDS_PIPE_SEL_MASK_CPT;
 250                 temp |= LVDS_PIPE_SEL_CPT(pipe);
 251         } else {
 252                 temp &= ~LVDS_PIPE_SEL_MASK;
 253                 temp |= LVDS_PIPE_SEL(pipe);
 254         }
 255
 256         /* set the corresponsding LVDS_BORDER bit */
 257         temp &= ~LVDS_BORDER_ENABLE;
 258         temp |= pipe_config->gmch_pfit.lvds_border_bits;
 259
 260         /*
 261          * Set the B0-B3 data pairs corresponding to whether we're going to
 262          * set the DPLLs for dual-channel mode or not.
 263          */
 264         if (lvds_encoder->is_dual_link)
 265                 temp |= LVDS_B0B3_POWER_UP | LVDS_CLKB_POWER_UP;
 266         else
 267                 temp &= ~(LVDS_B0B3_POWER_UP | LVDS_CLKB_POWER_UP);
 268
 269         /*
 270          * It would be nice to set 24 vs 18-bit mode (LVDS_A3_POWER_UP)
 271          * appropriately here, but we need to look more thoroughly into how
 272          * panels behave in the two modes. For now, let's just maintain the
 273          * value we got from the BIOS.
 274          */
 275         temp &= ~LVDS_A3_POWER_MASK;
 276         temp |= lvds_encoder->a3_power;
 277
 278         /*
 279          * Set the dithering flag on LVDS as needed, note that there is no
 280          * special lvds dither control bit on pch-split platforms, dithering is
 281          * only controlled through the PIPECONF reg.
 282          */
 283         if (IS_GEN(dev_priv, 4)) {
 284                 /*
 285                  * Bspec wording suggests that LVDS port dithering only exists
 286                  * for 18bpp panels.
 287                  */
 288                 if (pipe_config->dither && pipe_config->pipe_bpp == 18)
 289                         temp |= LVDS_ENABLE_DITHER;
 290                 else
 291                         temp &= ~LVDS_ENABLE_DITHER;
 292         }
 293         temp &= ~(LVDS_HSYNC_POLARITY | LVDS_VSYNC_POLARITY);
 294         if (adjusted_mode->flags & DRM_MODE_FLAG_NHSYNC)
 295                 temp |= LVDS_HSYNC_POLARITY;
 296         if (adjusted_mode->flags & DRM_MODE_FLAG_NVSYNC)
 297                 temp |= LVDS_VSYNC_POLARITY;
 298
 299         intel_de_write(dev_priv, lvds_encoder->reg, temp);
 300 }
 301
 302 /*
 303  * Sets the power state for the panel.
 304  */
 305 static void intel_enable_lvds(struct intel_atomic_state *state,
 306                               struct intel_encoder *encoder,
 307                               const struct intel_crtc_state *pipe_config,
 308                               const struct drm_connector_state *conn_state)
 309 {
 310         struct drm_device *dev = encoder->base.dev;
 311         struct intel_lvds_encoder *lvds_encoder = to_lvds_encoder(&encoder->base);
 312         struct drm_i915_private *dev_priv = to_i915(dev);
 313
 314         intel_de_write(dev_priv, lvds_encoder->reg,
 315                        intel_de_read(dev_priv, lvds_encoder->reg) | LVDS_PORT_EN);
 316
 317         intel_de_write(dev_priv, PP_CONTROL(0),
 318                        intel_de_read(dev_priv, PP_CONTROL(0)) | PANEL_POWER_ON);
 319         intel_de_posting_read(dev_priv, lvds_encoder->reg);
 320
 321         if (intel_de_wait_for_set(dev_priv, PP_STATUS(0), PP_ON, 5000))
 322                 drm_err(&dev_priv->drm,
 323                         "timed out waiting for panel to power on\n");
 324
 325         intel_panel_enable_backlight(pipe_config, conn_state);
 326 }
 327
 328 static void intel_disable_lvds(struct intel_atomic_state *state,
 329                                struct intel_encoder *encoder,
 330                                const struct intel_crtc_state *old_crtc_state,
 331                                const struct drm_connector_state *old_conn_state)
 332 {
 333         struct intel_lvds_encoder *lvds_encoder = to_lvds_encoder(&encoder->base);
 334         struct drm_i915_private *dev_priv = to_i915(encoder->base.dev);
 335
 336         intel_de_write(dev_priv, PP_CONTROL(0),
 337                        intel_de_read(dev_priv, PP_CONTROL(0)) & ~PANEL_POWER_ON);
 338         if (intel_de_wait_for_clear(dev_priv, PP_STATUS(0), PP_ON, 1000))
 339                 drm_err(&dev_priv->drm,
 340                         "timed out waiting for panel to power off\n");
 341
 342         intel_de_write(dev_priv, lvds_encoder->reg,
 343                        intel_de_read(dev_priv, lvds_encoder->reg) & ~LVDS_PORT_EN);
 344         intel_de_posting_read(dev_priv, lvds_encoder->reg);
 345 }
 346
 347 static void gmch_disable_lvds(struct intel_atomic_state *state,
 348                               struct intel_encoder *encoder,
 349                               const struct intel_crtc_state *old_crtc_state,
 350                               const struct drm_connector_state *old_conn_state)
 351
 352 {
 353         intel_panel_disable_backlight(old_conn_state);
 354
 355         intel_disable_lvds(state, encoder, old_crtc_state, old_conn_state);
 356 }
 357
 358 static void pch_disable_lvds(struct intel_atomic_state *state,
 359                              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_panel_disable_backlight(old_conn_state);
 364 }
 365
 366 static void pch_post_disable_lvds(struct intel_atomic_state *state,
 367                                   struct intel_encoder *encoder,
 368                                   const struct intel_crtc_state *old_crtc_state,
 369                                   const struct drm_connector_state *old_conn_state)
 370 {
 371         intel_disable_lvds(state, encoder, old_crtc_state, old_conn_state);
 372 }
 373
 374 static enum drm_mode_status
 375 intel_lvds_mode_valid(struct drm_connector *connector,
 376                       struct drm_display_mode *mode)
 377 {
 378         struct intel_connector *intel_connector = to_intel_connector(connector);
 379         struct drm_display_mode *fixed_mode = intel_connector->panel.fixed_mode;
 380         int max_pixclk = to_i915(connector->dev)->max_dotclk_freq;
 381
 382         if (mode->flags & DRM_MODE_FLAG_DBLSCAN)
 383                 return MODE_NO_DBLESCAN;
 384         if (mode->hdisplay > fixed_mode->hdisplay)
 385                 return MODE_PANEL;
 386         if (mode->vdisplay > fixed_mode->vdisplay)
 387                 return MODE_PANEL;
 388         if (fixed_mode->clock > max_pixclk)
 389                 return MODE_CLOCK_HIGH;
 390
 391         return MODE_OK;
 392 }
 393
 394 static int intel_lvds_compute_config(struct intel_encoder *intel_encoder,
 395                                      struct intel_crtc_state *pipe_config,
 396                                      struct drm_connector_state *conn_state)
 397 {
 398         struct drm_i915_private *dev_priv = to_i915(intel_encoder->base.dev);
 399         struct intel_lvds_encoder *lvds_encoder =
 400                 to_lvds_encoder(&intel_encoder->base);
 401         struct intel_connector *intel_connector =
 402                 lvds_encoder->attached_connector;
 403         struct drm_display_mode *adjusted_mode = &pipe_config->hw.adjusted_mode;
 404         struct intel_crtc *intel_crtc = to_intel_crtc(pipe_config->uapi.crtc);
 405         unsigned int lvds_bpp;
 406
 407         /* Should never happen!! */
 408         if (INTEL_GEN(dev_priv) < 4 && intel_crtc->pipe == 0) {
 409                 drm_err(&dev_priv->drm, "Can't support LVDS on pipe A\n");
 410                 return -EINVAL;
 411         }
 412
 413         if (lvds_encoder->a3_power == LVDS_A3_POWER_UP)
 414                 lvds_bpp = 8*3;
 415         else
 416                 lvds_bpp = 6*3;
 417
 418         if (lvds_bpp != pipe_config->pipe_bpp && !pipe_config->bw_constrained) {
 419                 drm_dbg_kms(&dev_priv->drm,
 420                             "forcing display bpp (was %d) to LVDS (%d)\n",
 421                             pipe_config->pipe_bpp, lvds_bpp);
 422                 pipe_config->pipe_bpp = lvds_bpp;
 423         }
 424
 425         pipe_config->output_format = INTEL_OUTPUT_FORMAT_RGB;
 426
 427         /*
 428          * We have timings from the BIOS for the panel, put them in
 429          * to the adjusted mode.  The CRTC will be set up for this mode,
 430          * with the panel scaling set up to source from the H/VDisplay
 431          * of the original mode.
 432          */
 433         intel_fixed_panel_mode(intel_connector->panel.fixed_mode,
 434                                adjusted_mode);
 435
 436         if (adjusted_mode->flags & DRM_MODE_FLAG_DBLSCAN)
 437                 return -EINVAL;
 438
 439         if (HAS_PCH_SPLIT(dev_priv)) {
 440                 pipe_config->has_pch_encoder = true;
 441
 442                 intel_pch_panel_fitting(pipe_config, conn_state);
 443         } else {
 444                 intel_gmch_panel_fitting(pipe_config, conn_state);
 445         }
 446
 447         /*
 448          * XXX: It would be nice to support lower refresh rates on the
 449          * panels to reduce power consumption, and perhaps match the
 450          * user's requested refresh rate.
 451          */
 452
 453         return 0;
 454 }
 455
 456 static enum drm_connector_status
 457 intel_lvds_detect(struct drm_connector *connector, bool force)
 458 {
 459         return connector_status_connected;
 460 }
 461
 462 /*
 463  * Return the list of DDC modes if available, or the BIOS fixed mode otherwise.
 464  */
 465 static int intel_lvds_get_modes(struct drm_connector *connector)
 466 {
 467         struct intel_connector *intel_connector = to_intel_connector(connector);
 468         struct drm_device *dev = connector->dev;
 469         struct drm_display_mode *mode;
 470
 471         /* use cached edid if we have one */
 472         if (!IS_ERR_OR_NULL(intel_connector->edid))
 473                 return drm_add_edid_modes(connector, intel_connector->edid);
 474
 475         mode = drm_mode_duplicate(dev, intel_connector->panel.fixed_mode);
 476         if (mode == NULL)
 477                 return 0;
 478
 479         drm_mode_probed_add(connector, mode);
 480         return 1;
 481 }
 482
 483 static const struct drm_connector_helper_funcs intel_lvds_connector_helper_funcs = {
 484         .get_modes = intel_lvds_get_modes,
 485         .mode_valid = intel_lvds_mode_valid,
 486         .atomic_check = intel_digital_connector_atomic_check,
 487 };
 488
 489 static const struct drm_connector_funcs intel_lvds_connector_funcs = {
 490         .detect = intel_lvds_detect,
 491         .fill_modes = drm_helper_probe_single_connector_modes,
 492         .atomic_get_property = intel_digital_connector_atomic_get_property,
 493         .atomic_set_property = intel_digital_connector_atomic_set_property,
 494         .late_register = intel_connector_register,
 495         .early_unregister = intel_connector_unregister,
 496         .destroy = intel_connector_destroy,
 497         .atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
 498         .atomic_duplicate_state = intel_digital_connector_duplicate_state,
 499 };
 500
 501 static const struct drm_encoder_funcs intel_lvds_enc_funcs = {
 502         .destroy = intel_encoder_destroy,
 503 };
 504
 505 static int intel_no_lvds_dmi_callback(const struct dmi_system_id *id)
 506 {
 507         DRM_INFO("Skipping LVDS initialization for %s\n", id->ident);
 508         return 1;
 509 }
 510
 511 /* These systems claim to have LVDS, but really don't */
 512 static const struct dmi_system_id intel_no_lvds[] = {
 513         {
 514                 .callback = intel_no_lvds_dmi_callback,
 515                 .ident = "Apple Mac Mini (Core series)",
 516                 .matches = {
 517                         DMI_MATCH(DMI_SYS_VENDOR, "Apple"),
 518                         DMI_MATCH(DMI_PRODUCT_NAME, "Macmini1,1"),
 519                 },
 520         },
 521         {
 522                 .callback = intel_no_lvds_dmi_callback,
 523                 .ident = "Apple Mac Mini (Core 2 series)",
 524                 .matches = {
 525                         DMI_MATCH(DMI_SYS_VENDOR, "Apple"),
 526                         DMI_MATCH(DMI_PRODUCT_NAME, "Macmini2,1"),
 527                 },
 528         },
 529         {
 530                 .callback = intel_no_lvds_dmi_callback,
 531                 .ident = "MSI IM-945GSE-A",
 532                 .matches = {
 533                         DMI_MATCH(DMI_SYS_VENDOR, "MSI"),
 534                         DMI_MATCH(DMI_PRODUCT_NAME, "A9830IMS"),
 535                 },
 536         },
 537         {
 538                 .callback = intel_no_lvds_dmi_callback,
 539                 .ident = "Dell Studio Hybrid",
 540                 .matches = {
 541                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 542                         DMI_MATCH(DMI_PRODUCT_NAME, "Studio Hybrid 140g"),
 543                 },
 544         },
 545         {
 546                 .callback = intel_no_lvds_dmi_callback,
 547                 .ident = "Dell OptiPlex FX170",
 548                 .matches = {
 549                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 550                         DMI_MATCH(DMI_PRODUCT_NAME, "OptiPlex FX170"),
 551                 },
 552         },
 553         {
 554                 .callback = intel_no_lvds_dmi_callback,
 555                 .ident = "AOpen Mini PC",
 556                 .matches = {
 557                         DMI_MATCH(DMI_SYS_VENDOR, "AOpen"),
 558                         DMI_MATCH(DMI_PRODUCT_NAME, "i965GMx-IF"),
 559                 },
 560         },
 561         {
 562                 .callback = intel_no_lvds_dmi_callback,
 563                 .ident = "AOpen Mini PC MP915",
 564                 .matches = {
 565                         DMI_MATCH(DMI_BOARD_VENDOR, "AOpen"),
 566                         DMI_MATCH(DMI_BOARD_NAME, "i915GMx-F"),
 567                 },
 568         },
 569         {
 570                 .callback = intel_no_lvds_dmi_callback,
 571                 .ident = "AOpen i915GMm-HFS",
 572                 .matches = {
 573                         DMI_MATCH(DMI_BOARD_VENDOR, "AOpen"),
 574                         DMI_MATCH(DMI_BOARD_NAME, "i915GMm-HFS"),
 575                 },
 576         },
 577         {
 578                 .callback = intel_no_lvds_dmi_callback,
 579                 .ident = "AOpen i45GMx-I",
 580                 .matches = {
 581                         DMI_MATCH(DMI_BOARD_VENDOR, "AOpen"),
 582                         DMI_MATCH(DMI_BOARD_NAME, "i45GMx-I"),
 583                 },
 584         },
 585         {
 586                 .callback = intel_no_lvds_dmi_callback,
 587                 .ident = "Aopen i945GTt-VFA",
 588                 .matches = {
 589                         DMI_MATCH(DMI_PRODUCT_VERSION, "AO00001JW"),
 590                 },
 591         },
 592         {
 593                 .callback = intel_no_lvds_dmi_callback,
 594                 .ident = "Clientron U800",
 595                 .matches = {
 596                         DMI_MATCH(DMI_SYS_VENDOR, "Clientron"),
 597                         DMI_MATCH(DMI_PRODUCT_NAME, "U800"),
 598                 },
 599         },
 600         {
 601                 .callback = intel_no_lvds_dmi_callback,
 602                 .ident = "Clientron E830",
 603                 .matches = {
 604                         DMI_MATCH(DMI_SYS_VENDOR, "Clientron"),
 605                         DMI_MATCH(DMI_PRODUCT_NAME, "E830"),
 606                 },
 607         },
 608         {
 609                 .callback = intel_no_lvds_dmi_callback,
 610                 .ident = "Asus EeeBox PC EB1007",
 611                 .matches = {
 612                         DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK Computer INC."),
 613                         DMI_MATCH(DMI_PRODUCT_NAME, "EB1007"),
 614                 },
 615         },
 616         {
 617                 .callback = intel_no_lvds_dmi_callback,
 618                 .ident = "Asus AT5NM10T-I",
 619                 .matches = {
 620                         DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer INC."),
 621                         DMI_MATCH(DMI_BOARD_NAME, "AT5NM10T-I"),
 622                 },
 623         },
 624         {
 625                 .callback = intel_no_lvds_dmi_callback,
 626                 .ident = "Hewlett-Packard HP t5740",
 627                 .matches = {
 628                         DMI_MATCH(DMI_BOARD_VENDOR, "Hewlett-Packard"),
 629                         DMI_MATCH(DMI_PRODUCT_NAME, " t5740"),
 630                 },
 631         },
 632         {
 633                 .callback = intel_no_lvds_dmi_callback,
 634                 .ident = "Hewlett-Packard t5745",
 635                 .matches = {
 636                         DMI_MATCH(DMI_BOARD_VENDOR, "Hewlett-Packard"),
 637                         DMI_MATCH(DMI_PRODUCT_NAME, "hp t5745"),
 638                 },
 639         },
 640         {
 641                 .callback = intel_no_lvds_dmi_callback,
 642                 .ident = "Hewlett-Packard st5747",
 643                 .matches = {
 644                         DMI_MATCH(DMI_BOARD_VENDOR, "Hewlett-Packard"),
 645                         DMI_MATCH(DMI_PRODUCT_NAME, "hp st5747"),
 646                 },
 647         },
 648         {
 649                 .callback = intel_no_lvds_dmi_callback,
 650                 .ident = "MSI Wind Box DC500",
 651                 .matches = {
 652                         DMI_MATCH(DMI_BOARD_VENDOR, "MICRO-STAR INTERNATIONAL CO., LTD"),
 653                         DMI_MATCH(DMI_BOARD_NAME, "MS-7469"),
 654                 },
 655         },
 656         {
 657                 .callback = intel_no_lvds_dmi_callback,
 658                 .ident = "Gigabyte GA-D525TUD",
 659                 .matches = {
 660                         DMI_MATCH(DMI_BOARD_VENDOR, "Gigabyte Technology Co., Ltd."),
 661                         DMI_MATCH(DMI_BOARD_NAME, "D525TUD"),
 662                 },
 663         },
 664         {
 665                 .callback = intel_no_lvds_dmi_callback,
 666                 .ident = "Supermicro X7SPA-H",
 667                 .matches = {
 668                         DMI_MATCH(DMI_SYS_VENDOR, "Supermicro"),
 669                         DMI_MATCH(DMI_PRODUCT_NAME, "X7SPA-H"),
 670                 },
 671         },
 672         {
 673                 .callback = intel_no_lvds_dmi_callback,
 674                 .ident = "Fujitsu Esprimo Q900",
 675                 .matches = {
 676                         DMI_MATCH(DMI_SYS_VENDOR, "FUJITSU"),
 677                         DMI_MATCH(DMI_PRODUCT_NAME, "ESPRIMO Q900"),
 678                 },
 679         },
 680         {
 681                 .callback = intel_no_lvds_dmi_callback,
 682                 .ident = "Intel D410PT",
 683                 .matches = {
 684                         DMI_MATCH(DMI_BOARD_VENDOR, "Intel"),
 685                         DMI_MATCH(DMI_BOARD_NAME, "D410PT"),
 686                 },
 687         },
 688         {
 689                 .callback = intel_no_lvds_dmi_callback,
 690                 .ident = "Intel D425KT",
 691                 .matches = {
 692                         DMI_MATCH(DMI_BOARD_VENDOR, "Intel"),
 693                         DMI_EXACT_MATCH(DMI_BOARD_NAME, "D425KT"),
 694                 },
 695         },
 696         {
 697                 .callback = intel_no_lvds_dmi_callback,
 698                 .ident = "Intel D510MO",
 699                 .matches = {
 700                         DMI_MATCH(DMI_BOARD_VENDOR, "Intel"),
 701                         DMI_EXACT_MATCH(DMI_BOARD_NAME, "D510MO"),
 702                 },
 703         },
 704         {
 705                 .callback = intel_no_lvds_dmi_callback,
 706                 .ident = "Intel D525MW",
 707                 .matches = {
 708                         DMI_MATCH(DMI_BOARD_VENDOR, "Intel"),
 709                         DMI_EXACT_MATCH(DMI_BOARD_NAME, "D525MW"),
 710                 },
 711         },
 712         {
 713                 .callback = intel_no_lvds_dmi_callback,
 714                 .ident = "Radiant P845",
 715                 .matches = {
 716                         DMI_MATCH(DMI_SYS_VENDOR, "Radiant Systems Inc"),
 717                         DMI_MATCH(DMI_PRODUCT_NAME, "P845"),
 718                 },
 719         },
 720
 721         { }     /* terminating entry */
 722 };
 723
 724 static int intel_dual_link_lvds_callback(const struct dmi_system_id *id)
 725 {
 726         DRM_INFO("Forcing lvds to dual link mode on %s\n", id->ident);
 727         return 1;
 728 }
 729
 730 static const struct dmi_system_id intel_dual_link_lvds[] = {
 731         {
 732                 .callback = intel_dual_link_lvds_callback,
 733                 .ident = "Apple MacBook Pro 15\" (2010)",
 734                 .matches = {
 735                         DMI_MATCH(DMI_SYS_VENDOR, "Apple Inc."),
 736                         DMI_MATCH(DMI_PRODUCT_NAME, "MacBookPro6,2"),
 737                 },
 738         },
 739         {
 740                 .callback = intel_dual_link_lvds_callback,
 741                 .ident = "Apple MacBook Pro 15\" (2011)",
 742                 .matches = {
 743                         DMI_MATCH(DMI_SYS_VENDOR, "Apple Inc."),
 744                         DMI_MATCH(DMI_PRODUCT_NAME, "MacBookPro8,2"),
 745                 },
 746         },
 747         {
 748                 .callback = intel_dual_link_lvds_callback,
 749                 .ident = "Apple MacBook Pro 15\" (2012)",
 750                 .matches = {
 751                         DMI_MATCH(DMI_SYS_VENDOR, "Apple Inc."),
 752                         DMI_MATCH(DMI_PRODUCT_NAME, "MacBookPro9,1"),
 753                 },
 754         },
 755         { }     /* terminating entry */
 756 };
 757
 758 struct intel_encoder *intel_get_lvds_encoder(struct drm_i915_private *dev_priv)
 759 {
 760         struct intel_encoder *encoder;
 761
 762         for_each_intel_encoder(&dev_priv->drm, encoder) {
 763                 if (encoder->type == INTEL_OUTPUT_LVDS)
 764                         return encoder;
 765         }
 766
 767         return NULL;
 768 }
 769
 770 bool intel_is_dual_link_lvds(struct drm_i915_private *dev_priv)
 771 {
 772         struct intel_encoder *encoder = intel_get_lvds_encoder(dev_priv);
 773
 774         return encoder && to_lvds_encoder(&encoder->base)->is_dual_link;
 775 }
 776
 777 static bool compute_is_dual_link_lvds(struct intel_lvds_encoder *lvds_encoder)
 778 {
 779         struct drm_device *dev = lvds_encoder->base.base.dev;
 780         unsigned int val;
 781         struct drm_i915_private *dev_priv = to_i915(dev);
 782
 783         /* use the module option value if specified */
 784         if (i915_modparams.lvds_channel_mode > 0)
 785                 return i915_modparams.lvds_channel_mode == 2;
 786
 787         /* single channel LVDS is limited to 112 MHz */
 788         if (lvds_encoder->attached_connector->panel.fixed_mode->clock > 112999)
 789                 return true;
 790
 791         if (dmi_check_system(intel_dual_link_lvds))
 792                 return true;
 793
 794         /*
 795          * BIOS should set the proper LVDS register value at boot, but
 796          * in reality, it doesn't set the value when the lid is closed;
 797          * we need to check "the value to be set" in VBT when LVDS
 798          * register is uninitialized.
 799          */
 800         val = intel_de_read(dev_priv, lvds_encoder->reg);
 801         if (HAS_PCH_CPT(dev_priv))
 802                 val &= ~(LVDS_DETECTED | LVDS_PIPE_SEL_MASK_CPT);
 803         else
 804                 val &= ~(LVDS_DETECTED | LVDS_PIPE_SEL_MASK);
 805         if (val == 0)
 806                 val = dev_priv->vbt.bios_lvds_val;
 807
 808         return (val & LVDS_CLKB_POWER_MASK) == LVDS_CLKB_POWER_UP;
 809 }
 810
 811 /**
 812  * intel_lvds_init - setup LVDS connectors on this device
 813  * @dev_priv: i915 device
 814  *
 815  * Create the connector, register the LVDS DDC bus, and try to figure out what
 816  * modes we can display on the LVDS panel (if present).
 817  */
 818 void intel_lvds_init(struct drm_i915_private *dev_priv)
 819 {
 820         struct drm_device *dev = &dev_priv->drm;
 821         struct intel_lvds_encoder *lvds_encoder;
 822         struct intel_encoder *intel_encoder;
 823         struct intel_connector *intel_connector;
 824         struct drm_connector *connector;
 825         struct drm_encoder *encoder;
 826         struct drm_display_mode *fixed_mode = NULL;
 827         struct drm_display_mode *downclock_mode = NULL;
 828         struct edid *edid;
 829         i915_reg_t lvds_reg;
 830         u32 lvds;
 831         u8 pin;
 832         u32 allowed_scalers;
 833
 834         /* Skip init on machines we know falsely report LVDS */
 835         if (dmi_check_system(intel_no_lvds)) {
 836                 drm_WARN(dev, !dev_priv->vbt.int_lvds_support,
 837                          "Useless DMI match. Internal LVDS support disabled by VBT\n");
 838                 return;
 839         }
 840
 841         if (!dev_priv->vbt.int_lvds_support) {
 842                 drm_dbg_kms(&dev_priv->drm,
 843                             "Internal LVDS support disabled by VBT\n");
 844                 return;
 845         }
 846
 847         if (HAS_PCH_SPLIT(dev_priv))
 848                 lvds_reg = PCH_LVDS;
 849         else
 850                 lvds_reg = LVDS;
 851
 852         lvds = intel_de_read(dev_priv, lvds_reg);
 853
 854         if (HAS_PCH_SPLIT(dev_priv)) {
 855                 if ((lvds & LVDS_DETECTED) == 0)
 856                         return;
 857         }
 858
 859         pin = GMBUS_PIN_PANEL;
 860         if (!intel_bios_is_lvds_present(dev_priv, &pin)) {
 861                 if ((lvds & LVDS_PORT_EN) == 0) {
 862                         drm_dbg_kms(&dev_priv->drm,
 863                                     "LVDS is not present in VBT\n");
 864                         return;
 865                 }
 866                 drm_dbg_kms(&dev_priv->drm,
 867                             "LVDS is not present in VBT, but enabled anyway\n");
 868         }
 869
 870         lvds_encoder = kzalloc(sizeof(*lvds_encoder), GFP_KERNEL);
 871         if (!lvds_encoder)
 872                 return;
 873
 874         intel_connector = intel_connector_alloc();
 875         if (!intel_connector) {
 876                 kfree(lvds_encoder);
 877                 return;
 878         }
 879
 880         lvds_encoder->attached_connector = intel_connector;
 881
 882         intel_encoder = &lvds_encoder->base;
 883         encoder = &intel_encoder->base;
 884         connector = &intel_connector->base;
 885         drm_connector_init(dev, &intel_connector->base, &intel_lvds_connector_funcs,
 886                            DRM_MODE_CONNECTOR_LVDS);
 887
 888         drm_encoder_init(dev, &intel_encoder->base, &intel_lvds_enc_funcs,
 889                          DRM_MODE_ENCODER_LVDS, "LVDS");
 890
 891         intel_encoder->enable = intel_enable_lvds;
 892         intel_encoder->pre_enable = intel_pre_enable_lvds;
 893         intel_encoder->compute_config = intel_lvds_compute_config;
 894         if (HAS_PCH_SPLIT(dev_priv)) {
 895                 intel_encoder->disable = pch_disable_lvds;
 896                 intel_encoder->post_disable = pch_post_disable_lvds;
 897         } else {
 898                 intel_encoder->disable = gmch_disable_lvds;
 899         }
 900         intel_encoder->get_hw_state = intel_lvds_get_hw_state;
 901         intel_encoder->get_config = intel_lvds_get_config;
 902         intel_encoder->update_pipe = intel_panel_update_backlight;
 903         intel_connector->get_hw_state = intel_connector_get_hw_state;
 904
 905         intel_connector_attach_encoder(intel_connector, intel_encoder);
 906
 907         intel_encoder->type = INTEL_OUTPUT_LVDS;
 908         intel_encoder->power_domain = POWER_DOMAIN_PORT_OTHER;
 909         intel_encoder->port = PORT_NONE;
 910         intel_encoder->cloneable = 0;
 911         if (INTEL_GEN(dev_priv) < 4)
 912                 intel_encoder->pipe_mask = BIT(PIPE_B);
 913         else
 914                 intel_encoder->pipe_mask = ~0;
 915
 916         drm_connector_helper_add(connector, &intel_lvds_connector_helper_funcs);
 917         connector->display_info.subpixel_order = SubPixelHorizontalRGB;
 918         connector->interlace_allowed = false;
 919         connector->doublescan_allowed = false;
 920
 921         lvds_encoder->reg = lvds_reg;
 922
 923         /* create the scaling mode property */
 924         allowed_scalers = BIT(DRM_MODE_SCALE_ASPECT);
 925         allowed_scalers |= BIT(DRM_MODE_SCALE_FULLSCREEN);
 926         allowed_scalers |= BIT(DRM_MODE_SCALE_CENTER);
 927         drm_connector_attach_scaling_mode_property(connector, allowed_scalers);
 928         connector->state->scaling_mode = DRM_MODE_SCALE_ASPECT;
 929
 930         intel_lvds_pps_get_hw_state(dev_priv, &lvds_encoder->init_pps);
 931         lvds_encoder->init_lvds_val = lvds;
 932
 933         /*
 934          * LVDS discovery:
 935          * 1) check for EDID on DDC
 936          * 2) check for VBT data
 937          * 3) check to see if LVDS is already on
 938          *    if none of the above, no panel
 939          */
 940
 941         /*
 942          * Attempt to get the fixed panel mode from DDC.  Assume that the
 943          * preferred mode is the right one.
 944          */
 945         mutex_lock(&dev->mode_config.mutex);
 946         if (vga_switcheroo_handler_flags() & VGA_SWITCHEROO_CAN_SWITCH_DDC)
 947                 edid = drm_get_edid_switcheroo(connector,
 948                                     intel_gmbus_get_adapter(dev_priv, pin));
 949         else
 950                 edid = drm_get_edid(connector,
 951                                     intel_gmbus_get_adapter(dev_priv, pin));
 952         if (edid) {
 953                 if (drm_add_edid_modes(connector, edid)) {
 954                         drm_connector_update_edid_property(connector,
 955                                                                 edid);
 956                 } else {
 957                         kfree(edid);
 958                         edid = ERR_PTR(-EINVAL);
 959                 }
 960         } else {
 961                 edid = ERR_PTR(-ENOENT);
 962         }
 963         intel_connector->edid = edid;
 964
 965         fixed_mode = intel_panel_edid_fixed_mode(intel_connector);
 966         if (fixed_mode)
 967                 goto out;
 968
 969         /* Failed to get EDID, what about VBT? */
 970         fixed_mode = intel_panel_vbt_fixed_mode(intel_connector);
 971         if (fixed_mode)
 972                 goto out;
 973
 974         /*
 975          * If we didn't get EDID, try checking if the panel is already turned
 976          * on.  If so, assume that whatever is currently programmed is the
 977          * correct mode.
 978          */
 979         fixed_mode = intel_encoder_current_mode(intel_encoder);
 980         if (fixed_mode) {
 981                 drm_dbg_kms(&dev_priv->drm, "using current (BIOS) mode: ");
 982                 drm_mode_debug_printmodeline(fixed_mode);
 983                 fixed_mode->type |= DRM_MODE_TYPE_PREFERRED;
 984         }
 985
 986         /* If we still don't have a mode after all that, give up. */
 987         if (!fixed_mode)
 988                 goto failed;
 989
 990 out:
 991         mutex_unlock(&dev->mode_config.mutex);
 992
 993         intel_panel_init(&intel_connector->panel, fixed_mode, downclock_mode);
 994         intel_panel_setup_backlight(connector, INVALID_PIPE);
 995
 996         lvds_encoder->is_dual_link = compute_is_dual_link_lvds(lvds_encoder);
 997         drm_dbg_kms(&dev_priv->drm, "detected %s-link lvds configuration\n",
 998                     lvds_encoder->is_dual_link ? "dual" : "single");
 999
1000         lvds_encoder->a3_power = lvds & LVDS_A3_POWER_MASK;
1001
1002         return;
1003
1004 failed:
1005         mutex_unlock(&dev->mode_config.mutex);
1006
1007         drm_dbg_kms(&dev_priv->drm, "No LVDS modes found, disabling.\n");
1008         drm_connector_cleanup(connector);
1009         drm_encoder_cleanup(encoder);
1010         kfree(lvds_encoder);
1011         intel_connector_free(intel_connector);
1012         return;
1013 }