drivers/gpu/drm/gma500/psb_intel_display.c

   1 /*
   2  * Copyright Â© 2006-2011 Intel Corporation
   3  *
   4  * This program is free software; you can redistribute it and/or modify it
   5  * under the terms and conditions of the GNU General Public License,
   6  * version 2, as published by the Free Software Foundation.
   7  *
   8  * This program is distributed in the hope it will be useful, but WITHOUT
   9  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  10  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  11  * more details.
  12  *
  13  * You should have received a copy of the GNU General Public License along with
  14  * this program; if not, write to the Free Software Foundation, Inc.,
  15  * 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
  16  *
  17  * Authors:
  18  *      Eric Anholt <eric@anholt.net>
  19  */
  20
  21 #include <linux/i2c.h>
  22
  23 #include <drm/drmP.h>
  24 #include <drm/drm_plane_helper.h>
  25 #include "framebuffer.h"
  26 #include "psb_drv.h"
  27 #include "psb_intel_drv.h"
  28 #include "psb_intel_reg.h"
  29 #include "gma_display.h"
  30 #include "power.h"
  31
  32 #define INTEL_LIMIT_I9XX_SDVO_DAC   0
  33 #define INTEL_LIMIT_I9XX_LVDS       1
  34
  35 static const struct gma_limit_t psb_intel_limits[] = {
  36         {                       /* INTEL_LIMIT_I9XX_SDVO_DAC */
  37          .dot = {.min = 20000, .max = 400000},
  38          .vco = {.min = 1400000, .max = 2800000},
  39          .n = {.min = 1, .max = 6},
  40          .m = {.min = 70, .max = 120},
  41          .m1 = {.min = 8, .max = 18},
  42          .m2 = {.min = 3, .max = 7},
  43          .p = {.min = 5, .max = 80},
  44          .p1 = {.min = 1, .max = 8},
  45          .p2 = {.dot_limit = 200000, .p2_slow = 10, .p2_fast = 5},
  46          .find_pll = gma_find_best_pll,
  47          },
  48         {                       /* INTEL_LIMIT_I9XX_LVDS */
  49          .dot = {.min = 20000, .max = 400000},
  50          .vco = {.min = 1400000, .max = 2800000},
  51          .n = {.min = 1, .max = 6},
  52          .m = {.min = 70, .max = 120},
  53          .m1 = {.min = 8, .max = 18},
  54          .m2 = {.min = 3, .max = 7},
  55          .p = {.min = 7, .max = 98},
  56          .p1 = {.min = 1, .max = 8},
  57          /* The single-channel range is 25-112Mhz, and dual-channel
  58           * is 80-224Mhz.  Prefer single channel as much as possible.
  59           */
  60          .p2 = {.dot_limit = 112000, .p2_slow = 14, .p2_fast = 7},
  61          .find_pll = gma_find_best_pll,
  62          },
  63 };
  64
  65 static const struct gma_limit_t *psb_intel_limit(struct drm_crtc *crtc,
  66                                                  int refclk)
  67 {
  68         const struct gma_limit_t *limit;
  69
  70         if (gma_pipe_has_type(crtc, INTEL_OUTPUT_LVDS))
  71                 limit = &psb_intel_limits[INTEL_LIMIT_I9XX_LVDS];
  72         else
  73                 limit = &psb_intel_limits[INTEL_LIMIT_I9XX_SDVO_DAC];
  74         return limit;
  75 }
  76
  77 static void psb_intel_clock(int refclk, struct gma_clock_t *clock)
  78 {
  79         clock->m = 5 * (clock->m1 + 2) + (clock->m2 + 2);
  80         clock->p = clock->p1 * clock->p2;
  81         clock->vco = refclk * clock->m / (clock->n + 2);
  82         clock->dot = clock->vco / clock->p;
  83 }
  84
  85 /**
  86  * Return the pipe currently connected to the panel fitter,
  87  * or -1 if the panel fitter is not present or not in use
  88  */
  89 static int psb_intel_panel_fitter_pipe(struct drm_device *dev)
  90 {
  91         u32 pfit_control;
  92
  93         pfit_control = REG_READ(PFIT_CONTROL);
  94
  95         /* See if the panel fitter is in use */
  96         if ((pfit_control & PFIT_ENABLE) == 0)
  97                 return -1;
  98         /* Must be on PIPE 1 for PSB */
  99         return 1;
 100 }
 101
 102 static int psb_intel_crtc_mode_set(struct drm_crtc *crtc,
 103                                struct drm_display_mode *mode,
 104                                struct drm_display_mode *adjusted_mode,
 105                                int x, int y,
 106                                struct drm_framebuffer *old_fb)
 107 {
 108         struct drm_device *dev = crtc->dev;
 109         struct drm_psb_private *dev_priv = dev->dev_private;
 110         struct gma_crtc *gma_crtc = to_gma_crtc(crtc);
 111         const struct drm_crtc_helper_funcs *crtc_funcs = crtc->helper_private;
 112         int pipe = gma_crtc->pipe;
 113         const struct psb_offset *map = &dev_priv->regmap[pipe];
 114         int refclk;
 115         struct gma_clock_t clock;
 116         u32 dpll = 0, fp = 0, dspcntr, pipeconf;
 117         bool ok, is_sdvo = false;
 118         bool is_lvds = false, is_tv = false;
 119         struct drm_mode_config *mode_config = &dev->mode_config;
 120         struct drm_connector *connector;
 121         const struct gma_limit_t *limit;
 122
 123         /* No scan out no play */
 124         if (crtc->primary->fb == NULL) {
 125                 crtc_funcs->mode_set_base(crtc, x, y, old_fb);
 126                 return 0;
 127         }
 128
 129         list_for_each_entry(connector, &mode_config->connector_list, head) {
 130                 struct gma_encoder *gma_encoder = gma_attached_encoder(connector);
 131
 132                 if (!connector->encoder
 133                     || connector->encoder->crtc != crtc)
 134                         continue;
 135
 136                 switch (gma_encoder->type) {
 137                 case INTEL_OUTPUT_LVDS:
 138                         is_lvds = true;
 139                         break;
 140                 case INTEL_OUTPUT_SDVO:
 141                         is_sdvo = true;
 142                         break;
 143                 case INTEL_OUTPUT_TVOUT:
 144                         is_tv = true;
 145                         break;
 146                 }
 147         }
 148
 149         refclk = 96000;
 150
 151         limit = gma_crtc->clock_funcs->limit(crtc, refclk);
 152
 153         ok = limit->find_pll(limit, crtc, adjusted_mode->clock, refclk,
 154                                  &clock);
 155         if (!ok) {
 156                 DRM_ERROR("Couldn't find PLL settings for mode! target: %d, actual: %d",
 157                           adjusted_mode->clock, clock.dot);
 158                 return 0;
 159         }
 160
 161         fp = clock.n << 16 | clock.m1 << 8 | clock.m2;
 162
 163         dpll = DPLL_VGA_MODE_DIS;
 164         if (is_lvds) {
 165                 dpll |= DPLLB_MODE_LVDS;
 166                 dpll |= DPLL_DVO_HIGH_SPEED;
 167         } else
 168                 dpll |= DPLLB_MODE_DAC_SERIAL;
 169         if (is_sdvo) {
 170                 int sdvo_pixel_multiply =
 171                             adjusted_mode->clock / mode->clock;
 172                 dpll |= DPLL_DVO_HIGH_SPEED;
 173                 dpll |=
 174                     (sdvo_pixel_multiply - 1) << SDVO_MULTIPLIER_SHIFT_HIRES;
 175         }
 176
 177         /* compute bitmask from p1 value */
 178         dpll |= (1 << (clock.p1 - 1)) << 16;
 179         switch (clock.p2) {
 180         case 5:
 181                 dpll |= DPLL_DAC_SERIAL_P2_CLOCK_DIV_5;
 182                 break;
 183         case 7:
 184                 dpll |= DPLLB_LVDS_P2_CLOCK_DIV_7;
 185                 break;
 186         case 10:
 187                 dpll |= DPLL_DAC_SERIAL_P2_CLOCK_DIV_10;
 188                 break;
 189         case 14:
 190                 dpll |= DPLLB_LVDS_P2_CLOCK_DIV_14;
 191                 break;
 192         }
 193
 194         if (is_tv) {
 195                 /* XXX: just matching BIOS for now */
 196 /*      dpll |= PLL_REF_INPUT_TVCLKINBC; */
 197                 dpll |= 3;
 198         }
 199         dpll |= PLL_REF_INPUT_DREFCLK;
 200
 201         /* setup pipeconf */
 202         pipeconf = REG_READ(map->conf);
 203
 204         /* Set up the display plane register */
 205         dspcntr = DISPPLANE_GAMMA_ENABLE;
 206
 207         if (pipe == 0)
 208                 dspcntr |= DISPPLANE_SEL_PIPE_A;
 209         else
 210                 dspcntr |= DISPPLANE_SEL_PIPE_B;
 211
 212         dspcntr |= DISPLAY_PLANE_ENABLE;
 213         pipeconf |= PIPEACONF_ENABLE;
 214         dpll |= DPLL_VCO_ENABLE;
 215
 216
 217         /* Disable the panel fitter if it was on our pipe */
 218         if (psb_intel_panel_fitter_pipe(dev) == pipe)
 219                 REG_WRITE(PFIT_CONTROL, 0);
 220
 221         drm_mode_debug_printmodeline(mode);
 222
 223         if (dpll & DPLL_VCO_ENABLE) {
 224                 REG_WRITE(map->fp0, fp);
 225                 REG_WRITE(map->dpll, dpll & ~DPLL_VCO_ENABLE);
 226                 REG_READ(map->dpll);
 227                 udelay(150);
 228         }
 229
 230         /* The LVDS pin pair needs to be on before the DPLLs are enabled.
 231          * This is an exception to the general rule that mode_set doesn't turn
 232          * things on.
 233          */
 234         if (is_lvds) {
 235                 u32 lvds = REG_READ(LVDS);
 236
 237                 lvds &= ~LVDS_PIPEB_SELECT;
 238                 if (pipe == 1)
 239                         lvds |= LVDS_PIPEB_SELECT;
 240
 241                 lvds |= LVDS_PORT_EN | LVDS_A0A2_CLKA_POWER_UP;
 242                 /* Set the B0-B3 data pairs corresponding to
 243                  * whether we're going to
 244                  * set the DPLLs for dual-channel mode or not.
 245                  */
 246                 lvds &= ~(LVDS_B0B3_POWER_UP | LVDS_CLKB_POWER_UP);
 247                 if (clock.p2 == 7)
 248                         lvds |= LVDS_B0B3_POWER_UP | LVDS_CLKB_POWER_UP;
 249
 250                 /* It would be nice to set 24 vs 18-bit mode (LVDS_A3_POWER_UP)
 251                  * appropriately here, but we need to look more
 252                  * thoroughly into how panels behave in the two modes.
 253                  */
 254
 255                 REG_WRITE(LVDS, lvds);
 256                 REG_READ(LVDS);
 257         }
 258
 259         REG_WRITE(map->fp0, fp);
 260         REG_WRITE(map->dpll, dpll);
 261         REG_READ(map->dpll);
 262         /* Wait for the clocks to stabilize. */
 263         udelay(150);
 264
 265         /* write it again -- the BIOS does, after all */
 266         REG_WRITE(map->dpll, dpll);
 267
 268         REG_READ(map->dpll);
 269         /* Wait for the clocks to stabilize. */
 270         udelay(150);
 271
 272         REG_WRITE(map->htotal, (adjusted_mode->crtc_hdisplay - 1) |
 273                   ((adjusted_mode->crtc_htotal - 1) << 16));
 274         REG_WRITE(map->hblank, (adjusted_mode->crtc_hblank_start - 1) |
 275                   ((adjusted_mode->crtc_hblank_end - 1) << 16));
 276         REG_WRITE(map->hsync, (adjusted_mode->crtc_hsync_start - 1) |
 277                   ((adjusted_mode->crtc_hsync_end - 1) << 16));
 278         REG_WRITE(map->vtotal, (adjusted_mode->crtc_vdisplay - 1) |
 279                   ((adjusted_mode->crtc_vtotal - 1) << 16));
 280         REG_WRITE(map->vblank, (adjusted_mode->crtc_vblank_start - 1) |
 281                   ((adjusted_mode->crtc_vblank_end - 1) << 16));
 282         REG_WRITE(map->vsync, (adjusted_mode->crtc_vsync_start - 1) |
 283                   ((adjusted_mode->crtc_vsync_end - 1) << 16));
 284         /* pipesrc and dspsize control the size that is scaled from,
 285          * which should always be the user's requested size.
 286          */
 287         REG_WRITE(map->size,
 288                   ((mode->vdisplay - 1) << 16) | (mode->hdisplay - 1));
 289         REG_WRITE(map->pos, 0);
 290         REG_WRITE(map->src,
 291                   ((mode->hdisplay - 1) << 16) | (mode->vdisplay - 1));
 292         REG_WRITE(map->conf, pipeconf);
 293         REG_READ(map->conf);
 294
 295         gma_wait_for_vblank(dev);
 296
 297         REG_WRITE(map->cntr, dspcntr);
 298
 299         /* Flush the plane changes */
 300         crtc_funcs->mode_set_base(crtc, x, y, old_fb);
 301
 302         gma_wait_for_vblank(dev);
 303
 304         return 0;
 305 }
 306
 307 /* Returns the clock of the currently programmed mode of the given pipe. */
 308 static int psb_intel_crtc_clock_get(struct drm_device *dev,
 309                                 struct drm_crtc *crtc)
 310 {
 311         struct gma_crtc *gma_crtc = to_gma_crtc(crtc);
 312         struct drm_psb_private *dev_priv = dev->dev_private;
 313         int pipe = gma_crtc->pipe;
 314         const struct psb_offset *map = &dev_priv->regmap[pipe];
 315         u32 dpll;
 316         u32 fp;
 317         struct gma_clock_t clock;
 318         bool is_lvds;
 319         struct psb_pipe *p = &dev_priv->regs.pipe[pipe];
 320
 321         if (gma_power_begin(dev, false)) {
 322                 dpll = REG_READ(map->dpll);
 323                 if ((dpll & DISPLAY_RATE_SELECT_FPA1) == 0)
 324                         fp = REG_READ(map->fp0);
 325                 else
 326                         fp = REG_READ(map->fp1);
 327                 is_lvds = (pipe == 1) && (REG_READ(LVDS) & LVDS_PORT_EN);
 328                 gma_power_end(dev);
 329         } else {
 330                 dpll = p->dpll;
 331
 332                 if ((dpll & DISPLAY_RATE_SELECT_FPA1) == 0)
 333                         fp = p->fp0;
 334                 else
 335                         fp = p->fp1;
 336
 337                 is_lvds = (pipe == 1) && (dev_priv->regs.psb.saveLVDS &
 338                                                                 LVDS_PORT_EN);
 339         }
 340
 341         clock.m1 = (fp & FP_M1_DIV_MASK) >> FP_M1_DIV_SHIFT;
 342         clock.m2 = (fp & FP_M2_DIV_MASK) >> FP_M2_DIV_SHIFT;
 343         clock.n = (fp & FP_N_DIV_MASK) >> FP_N_DIV_SHIFT;
 344
 345         if (is_lvds) {
 346                 clock.p1 =
 347                     ffs((dpll &
 348                          DPLL_FPA01_P1_POST_DIV_MASK_I830_LVDS) >>
 349                         DPLL_FPA01_P1_POST_DIV_SHIFT);
 350                 clock.p2 = 14;
 351
 352                 if ((dpll & PLL_REF_INPUT_MASK) ==
 353                     PLLB_REF_INPUT_SPREADSPECTRUMIN) {
 354                         /* XXX: might not be 66MHz */
 355                         psb_intel_clock(66000, &clock);
 356                 } else
 357                         psb_intel_clock(48000, &clock);
 358         } else {
 359                 if (dpll & PLL_P1_DIVIDE_BY_TWO)
 360                         clock.p1 = 2;
 361                 else {
 362                         clock.p1 =
 363                             ((dpll &
 364                               DPLL_FPA01_P1_POST_DIV_MASK_I830) >>
 365                              DPLL_FPA01_P1_POST_DIV_SHIFT) + 2;
 366                 }
 367                 if (dpll & PLL_P2_DIVIDE_BY_4)
 368                         clock.p2 = 4;
 369                 else
 370                         clock.p2 = 2;
 371
 372                 psb_intel_clock(48000, &clock);
 373         }
 374
 375         /* XXX: It would be nice to validate the clocks, but we can't reuse
 376          * i830PllIsValid() because it relies on the xf86_config connector
 377          * configuration being accurate, which it isn't necessarily.
 378          */
 379
 380         return clock.dot;
 381 }
 382
 383 /** Returns the currently programmed mode of the given pipe. */
 384 struct drm_display_mode *psb_intel_crtc_mode_get(struct drm_device *dev,
 385                                              struct drm_crtc *crtc)
 386 {
 387         struct gma_crtc *gma_crtc = to_gma_crtc(crtc);
 388         int pipe = gma_crtc->pipe;
 389         struct drm_display_mode *mode;
 390         int htot;
 391         int hsync;
 392         int vtot;
 393         int vsync;
 394         struct drm_psb_private *dev_priv = dev->dev_private;
 395         struct psb_pipe *p = &dev_priv->regs.pipe[pipe];
 396         const struct psb_offset *map = &dev_priv->regmap[pipe];
 397
 398         if (gma_power_begin(dev, false)) {
 399                 htot = REG_READ(map->htotal);
 400                 hsync = REG_READ(map->hsync);
 401                 vtot = REG_READ(map->vtotal);
 402                 vsync = REG_READ(map->vsync);
 403                 gma_power_end(dev);
 404         } else {
 405                 htot = p->htotal;
 406                 hsync = p->hsync;
 407                 vtot = p->vtotal;
 408                 vsync = p->vsync;
 409         }
 410
 411         mode = kzalloc(sizeof(*mode), GFP_KERNEL);
 412         if (!mode)
 413                 return NULL;
 414
 415         mode->clock = psb_intel_crtc_clock_get(dev, crtc);
 416         mode->hdisplay = (htot & 0xffff) + 1;
 417         mode->htotal = ((htot & 0xffff0000) >> 16) + 1;
 418         mode->hsync_start = (hsync & 0xffff) + 1;
 419         mode->hsync_end = ((hsync & 0xffff0000) >> 16) + 1;
 420         mode->vdisplay = (vtot & 0xffff) + 1;
 421         mode->vtotal = ((vtot & 0xffff0000) >> 16) + 1;
 422         mode->vsync_start = (vsync & 0xffff) + 1;
 423         mode->vsync_end = ((vsync & 0xffff0000) >> 16) + 1;
 424
 425         drm_mode_set_name(mode);
 426         drm_mode_set_crtcinfo(mode, 0);
 427
 428         return mode;
 429 }
 430
 431 const struct drm_crtc_helper_funcs psb_intel_helper_funcs = {
 432         .dpms = gma_crtc_dpms,
 433         .mode_fixup = gma_crtc_mode_fixup,
 434         .mode_set = psb_intel_crtc_mode_set,
 435         .mode_set_base = gma_pipe_set_base,
 436         .prepare = gma_crtc_prepare,
 437         .commit = gma_crtc_commit,
 438         .disable = gma_crtc_disable,
 439 };
 440
 441 const struct drm_crtc_funcs psb_intel_crtc_funcs = {
 442         .cursor_set = gma_crtc_cursor_set,
 443         .cursor_move = gma_crtc_cursor_move,
 444         .gamma_set = gma_crtc_gamma_set,
 445         .set_config = gma_crtc_set_config,
 446         .destroy = gma_crtc_destroy,
 447 };
 448
 449 const struct gma_clock_funcs psb_clock_funcs = {
 450         .clock = psb_intel_clock,
 451         .limit = psb_intel_limit,
 452         .pll_is_valid = gma_pll_is_valid,
 453 };
 454
 455 /*
 456  * Set the default value of cursor control and base register
 457  * to zero. This is a workaround for h/w defect on Oaktrail
 458  */
 459 static void psb_intel_cursor_init(struct drm_device *dev,
 460                                   struct gma_crtc *gma_crtc)
 461 {
 462         struct drm_psb_private *dev_priv = dev->dev_private;
 463         u32 control[3] = { CURACNTR, CURBCNTR, CURCCNTR };
 464         u32 base[3] = { CURABASE, CURBBASE, CURCBASE };
 465         struct gtt_range *cursor_gt;
 466
 467         if (dev_priv->ops->cursor_needs_phys) {
 468                 /* Allocate 4 pages of stolen mem for a hardware cursor. That
 469                  * is enough for the 64 x 64 ARGB cursors we support.
 470                  */
 471                 cursor_gt = psb_gtt_alloc_range(dev, 4 * PAGE_SIZE, "cursor", 1,
 472                                                 PAGE_SIZE);
 473                 if (!cursor_gt) {
 474                         gma_crtc->cursor_gt = NULL;
 475                         goto out;
 476                 }
 477                 gma_crtc->cursor_gt = cursor_gt;
 478                 gma_crtc->cursor_addr = dev_priv->stolen_base +
 479                                                         cursor_gt->offset;
 480         } else {
 481                 gma_crtc->cursor_gt = NULL;
 482         }
 483
 484 out:
 485         REG_WRITE(control[gma_crtc->pipe], 0);
 486         REG_WRITE(base[gma_crtc->pipe], 0);
 487 }
 488
 489 void psb_intel_crtc_init(struct drm_device *dev, int pipe,
 490                      struct psb_intel_mode_device *mode_dev)
 491 {
 492         struct drm_psb_private *dev_priv = dev->dev_private;
 493         struct gma_crtc *gma_crtc;
 494         int i;
 495         uint16_t *r_base, *g_base, *b_base;
 496
 497         /* We allocate a extra array of drm_connector pointers
 498          * for fbdev after the crtc */
 499         gma_crtc = kzalloc(sizeof(struct gma_crtc) +
 500                         (INTELFB_CONN_LIMIT * sizeof(struct drm_connector *)),
 501                         GFP_KERNEL);
 502         if (gma_crtc == NULL)
 503                 return;
 504
 505         gma_crtc->crtc_state =
 506                 kzalloc(sizeof(struct psb_intel_crtc_state), GFP_KERNEL);
 507         if (!gma_crtc->crtc_state) {
 508                 dev_err(dev->dev, "Crtc state error: No memory\n");
 509                 kfree(gma_crtc);
 510                 return;
 511         }
 512
 513         /* Set the CRTC operations from the chip specific data */
 514         drm_crtc_init(dev, &gma_crtc->base, dev_priv->ops->crtc_funcs);
 515
 516         /* Set the CRTC clock functions from chip specific data */
 517         gma_crtc->clock_funcs = dev_priv->ops->clock_funcs;
 518
 519         drm_mode_crtc_set_gamma_size(&gma_crtc->base, 256);
 520         gma_crtc->pipe = pipe;
 521         gma_crtc->plane = pipe;
 522
 523         r_base = gma_crtc->base.gamma_store;
 524         g_base = r_base + 256;
 525         b_base = g_base + 256;
 526         for (i = 0; i < 256; i++) {
 527                 gma_crtc->lut_r[i] = i;
 528                 gma_crtc->lut_g[i] = i;
 529                 gma_crtc->lut_b[i] = i;
 530                 r_base[i] = i << 8;
 531                 g_base[i] = i << 8;
 532                 b_base[i] = i << 8;
 533
 534                 gma_crtc->lut_adj[i] = 0;
 535         }
 536
 537         gma_crtc->mode_dev = mode_dev;
 538         gma_crtc->cursor_addr = 0;
 539
 540         drm_crtc_helper_add(&gma_crtc->base,
 541                                                 dev_priv->ops->crtc_helper);
 542
 543         /* Setup the array of drm_connector pointer array */
 544         gma_crtc->mode_set.crtc = &gma_crtc->base;
 545         BUG_ON(pipe >= ARRAY_SIZE(dev_priv->plane_to_crtc_mapping) ||
 546                dev_priv->plane_to_crtc_mapping[gma_crtc->plane] != NULL);
 547         dev_priv->plane_to_crtc_mapping[gma_crtc->plane] = &gma_crtc->base;
 548         dev_priv->pipe_to_crtc_mapping[gma_crtc->pipe] = &gma_crtc->base;
 549         gma_crtc->mode_set.connectors = (struct drm_connector **)(gma_crtc + 1);
 550         gma_crtc->mode_set.num_connectors = 0;
 551         psb_intel_cursor_init(dev, gma_crtc);
 552
 553         /* Set to true so that the pipe is forced off on initial config. */
 554         gma_crtc->active = true;
 555 }
 556
 557 struct drm_crtc *psb_intel_get_crtc_from_pipe(struct drm_device *dev, int pipe)
 558 {
 559         struct drm_crtc *crtc = NULL;
 560
 561         list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) {
 562                 struct gma_crtc *gma_crtc = to_gma_crtc(crtc);
 563                 if (gma_crtc->pipe == pipe)
 564                         break;
 565         }
 566         return crtc;
 567 }
 568
 569 int gma_connector_clones(struct drm_device *dev, int type_mask)
 570 {
 571         int index_mask = 0;
 572         struct drm_connector *connector;
 573         int entry = 0;
 574
 575         list_for_each_entry(connector, &dev->mode_config.connector_list,
 576                             head) {
 577                 struct gma_encoder *gma_encoder = gma_attached_encoder(connector);
 578                 if (type_mask & (1 << gma_encoder->type))
 579                         index_mask |= (1 << entry);
 580                 entry++;
 581         }
 582         return index_mask;
 583 }