drivers/staging/gma500/mrst_crtc.c

   1 /*
   2  * Copyright © 2009 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
  18 #include <linux/i2c.h>
  19 #include <linux/pm_runtime.h>
  20
  21 #include <drm/drmP.h>
  22 #include "framebuffer.h"
  23 #include "psb_drv.h"
  24 #include "psb_intel_drv.h"
  25 #include "psb_intel_reg.h"
  26 #include "psb_intel_display.h"
  27 #include "power.h"
  28
  29 struct psb_intel_range_t {
  30         int min, max;
  31 };
  32
  33 struct mrst_limit_t {
  34         struct psb_intel_range_t dot, m, p1;
  35 };
  36
  37 struct mrst_clock_t {
  38         /* derived values */
  39         int dot;
  40         int m;
  41         int p1;
  42 };
  43
  44 #define MRST_LIMIT_LVDS_100L        0
  45 #define MRST_LIMIT_LVDS_83          1
  46 #define MRST_LIMIT_LVDS_100         2
  47
  48 #define MRST_DOT_MIN              19750
  49 #define MRST_DOT_MAX              120000
  50 #define MRST_M_MIN_100L             20
  51 #define MRST_M_MIN_100              10
  52 #define MRST_M_MIN_83               12
  53 #define MRST_M_MAX_100L             34
  54 #define MRST_M_MAX_100              17
  55 #define MRST_M_MAX_83               20
  56 #define MRST_P1_MIN                 2
  57 #define MRST_P1_MAX_0               7
  58 #define MRST_P1_MAX_1               8
  59
  60 static const struct mrst_limit_t mrst_limits[] = {
  61         {                       /* MRST_LIMIT_LVDS_100L */
  62          .dot = {.min = MRST_DOT_MIN, .max = MRST_DOT_MAX},
  63          .m = {.min = MRST_M_MIN_100L, .max = MRST_M_MAX_100L},
  64          .p1 = {.min = MRST_P1_MIN, .max = MRST_P1_MAX_1},
  65          },
  66         {                       /* MRST_LIMIT_LVDS_83L */
  67          .dot = {.min = MRST_DOT_MIN, .max = MRST_DOT_MAX},
  68          .m = {.min = MRST_M_MIN_83, .max = MRST_M_MAX_83},
  69          .p1 = {.min = MRST_P1_MIN, .max = MRST_P1_MAX_0},
  70          },
  71         {                       /* MRST_LIMIT_LVDS_100 */
  72          .dot = {.min = MRST_DOT_MIN, .max = MRST_DOT_MAX},
  73          .m = {.min = MRST_M_MIN_100, .max = MRST_M_MAX_100},
  74          .p1 = {.min = MRST_P1_MIN, .max = MRST_P1_MAX_1},
  75          },
  76 };
  77
  78 #define MRST_M_MIN          10
  79 static const u32 mrst_m_converts[] = {
  80         0x2B, 0x15, 0x2A, 0x35, 0x1A, 0x0D, 0x26, 0x33, 0x19, 0x2C,
  81         0x36, 0x3B, 0x1D, 0x2E, 0x37, 0x1B, 0x2D, 0x16, 0x0B, 0x25,
  82         0x12, 0x09, 0x24, 0x32, 0x39, 0x1c,
  83 };
  84
  85 static const struct mrst_limit_t *mrst_limit(struct drm_crtc *crtc)
  86 {
  87         const struct mrst_limit_t *limit = NULL;
  88         struct drm_device *dev = crtc->dev;
  89         struct drm_psb_private *dev_priv = dev->dev_private;
  90
  91         if (psb_intel_pipe_has_type(crtc, INTEL_OUTPUT_LVDS)
  92             || psb_intel_pipe_has_type(crtc, INTEL_OUTPUT_MIPI)) {
  93                 switch (dev_priv->core_freq) {
  94                 case 100:
  95                         limit = &mrst_limits[MRST_LIMIT_LVDS_100L];
  96                         break;
  97                 case 166:
  98                         limit = &mrst_limits[MRST_LIMIT_LVDS_83];
  99                         break;
 100                 case 200:
 101                         limit = &mrst_limits[MRST_LIMIT_LVDS_100];
 102                         break;
 103                 }
 104         } else {
 105                 limit = NULL;
 106                 dev_err(dev->dev, "mrst_limit Wrong display type.\n");
 107         }
 108
 109         return limit;
 110 }
 111
 112 /** Derive the pixel clock for the given refclk and divisors for 8xx chips. */
 113 static void mrst_clock(int refclk, struct mrst_clock_t *clock)
 114 {
 115         clock->dot = (refclk * clock->m) / (14 * clock->p1);
 116 }
 117
 118 void mrstPrintPll(char *prefix, struct mrst_clock_t *clock)
 119 {
 120         pr_debug("%s: dotclock = %d,  m = %d, p1 = %d.\n",
 121              prefix, clock->dot, clock->m, clock->p1);
 122 }
 123
 124 /**
 125  * Returns a set of divisors for the desired target clock with the given refclk,
 126  * or FALSE.  Divisor values are the actual divisors for
 127  */
 128 static bool
 129 mrstFindBestPLL(struct drm_crtc *crtc, int target, int refclk,
 130                 struct mrst_clock_t *best_clock)
 131 {
 132         struct mrst_clock_t clock;
 133         const struct mrst_limit_t *limit = mrst_limit(crtc);
 134         int err = target;
 135
 136         memset(best_clock, 0, sizeof(*best_clock));
 137
 138         for (clock.m = limit->m.min; clock.m <= limit->m.max; clock.m++) {
 139                 for (clock.p1 = limit->p1.min; clock.p1 <= limit->p1.max;
 140                      clock.p1++) {
 141                         int this_err;
 142
 143                         mrst_clock(refclk, &clock);
 144
 145                         this_err = abs(clock.dot - target);
 146                         if (this_err < err) {
 147                                 *best_clock = clock;
 148                                 err = this_err;
 149                         }
 150                 }
 151         }
 152         dev_dbg(crtc->dev->dev, "mrstFindBestPLL err = %d.\n", err);
 153         return err != target;
 154 }
 155
 156 /**
 157  * Sets the power management mode of the pipe and plane.
 158  *
 159  * This code should probably grow support for turning the cursor off and back
 160  * on appropriately at the same time as we're turning the pipe off/on.
 161  */
 162 static void mrst_crtc_dpms(struct drm_crtc *crtc, int mode)
 163 {
 164         struct drm_device *dev = crtc->dev;
 165         struct psb_intel_crtc *psb_intel_crtc = to_psb_intel_crtc(crtc);
 166         int pipe = psb_intel_crtc->pipe;
 167         int dpll_reg = (pipe == 0) ? MRST_DPLL_A : DPLL_B;
 168         int dspcntr_reg = (pipe == 0) ? DSPACNTR : DSPBCNTR;
 169         int dspbase_reg = (pipe == 0) ? MRST_DSPABASE : DSPBBASE;
 170         int pipeconf_reg = (pipe == 0) ? PIPEACONF : PIPEBCONF;
 171         u32 temp;
 172         bool enabled;
 173
 174         if (!gma_power_begin(dev, true))
 175                 return;
 176
 177         /* XXX: When our outputs are all unaware of DPMS modes other than off
 178          * and on, we should map those modes to DRM_MODE_DPMS_OFF in the CRTC.
 179          */
 180         switch (mode) {
 181         case DRM_MODE_DPMS_ON:
 182         case DRM_MODE_DPMS_STANDBY:
 183         case DRM_MODE_DPMS_SUSPEND:
 184                 /* Enable the DPLL */
 185                 temp = REG_READ(dpll_reg);
 186                 if ((temp & DPLL_VCO_ENABLE) == 0) {
 187                         REG_WRITE(dpll_reg, temp);
 188                         REG_READ(dpll_reg);
 189                         /* Wait for the clocks to stabilize. */
 190                         udelay(150);
 191                         REG_WRITE(dpll_reg, temp | DPLL_VCO_ENABLE);
 192                         REG_READ(dpll_reg);
 193                         /* Wait for the clocks to stabilize. */
 194                         udelay(150);
 195                         REG_WRITE(dpll_reg, temp | DPLL_VCO_ENABLE);
 196                         REG_READ(dpll_reg);
 197                         /* Wait for the clocks to stabilize. */
 198                         udelay(150);
 199                 }
 200                 /* Enable the pipe */
 201                 temp = REG_READ(pipeconf_reg);
 202                 if ((temp & PIPEACONF_ENABLE) == 0)
 203                         REG_WRITE(pipeconf_reg, temp | PIPEACONF_ENABLE);
 204                 /* Enable the plane */
 205                 temp = REG_READ(dspcntr_reg);
 206                 if ((temp & DISPLAY_PLANE_ENABLE) == 0) {
 207                         REG_WRITE(dspcntr_reg,
 208                                   temp | DISPLAY_PLANE_ENABLE);
 209                         /* Flush the plane changes */
 210                         REG_WRITE(dspbase_reg, REG_READ(dspbase_reg));
 211                 }
 212
 213                 psb_intel_crtc_load_lut(crtc);
 214
 215                 /* Give the overlay scaler a chance to enable
 216                    if it's on this pipe */
 217                 /* psb_intel_crtc_dpms_video(crtc, true); TODO */
 218                 break;
 219         case DRM_MODE_DPMS_OFF:
 220                 /* Give the overlay scaler a chance to disable
 221                  * if it's on this pipe */
 222                 /* psb_intel_crtc_dpms_video(crtc, FALSE); TODO */
 223
 224                 /* Disable the VGA plane that we never use */
 225                 REG_WRITE(VGACNTRL, VGA_DISP_DISABLE);
 226                 /* Disable display plane */
 227                 temp = REG_READ(dspcntr_reg);
 228                 if ((temp & DISPLAY_PLANE_ENABLE) != 0) {
 229                         REG_WRITE(dspcntr_reg,
 230                                   temp & ~DISPLAY_PLANE_ENABLE);
 231                         /* Flush the plane changes */
 232                         REG_WRITE(dspbase_reg, REG_READ(dspbase_reg));
 233                         REG_READ(dspbase_reg);
 234                 }
 235
 236                 /* Next, disable display pipes */
 237                 temp = REG_READ(pipeconf_reg);
 238                 if ((temp & PIPEACONF_ENABLE) != 0) {
 239                         REG_WRITE(pipeconf_reg, temp & ~PIPEACONF_ENABLE);
 240                         REG_READ(pipeconf_reg);
 241                 }
 242                 /* Wait for for the pipe disable to take effect. */
 243                 psb_intel_wait_for_vblank(dev);
 244
 245                 temp = REG_READ(dpll_reg);
 246                 if ((temp & DPLL_VCO_ENABLE) != 0) {
 247                         REG_WRITE(dpll_reg, temp & ~DPLL_VCO_ENABLE);
 248                         REG_READ(dpll_reg);
 249                 }
 250
 251                 /* Wait for the clocks to turn off. */
 252                 udelay(150);
 253                 break;
 254         }
 255
 256         enabled = crtc->enabled && mode != DRM_MODE_DPMS_OFF;
 257
 258         /*Set FIFO Watermarks*/
 259         REG_WRITE(DSPARB, 0x3FFF);
 260         REG_WRITE(DSPFW1, 0x3F88080A);
 261         REG_WRITE(DSPFW2, 0x0b060808);
 262         REG_WRITE(DSPFW3, 0x0);
 263         REG_WRITE(DSPFW4, 0x08030404);
 264         REG_WRITE(DSPFW5, 0x04040404);
 265         REG_WRITE(DSPFW6, 0x78);
 266         REG_WRITE(0x70400, REG_READ(0x70400) | 0x4000);
 267         /* Must write Bit 14 of the Chicken Bit Register */
 268
 269         gma_power_end(dev);
 270 }
 271
 272 /**
 273  * Return the pipe currently connected to the panel fitter,
 274  * or -1 if the panel fitter is not present or not in use
 275  */
 276 static int mrst_panel_fitter_pipe(struct drm_device *dev)
 277 {
 278         u32 pfit_control;
 279
 280         pfit_control = REG_READ(PFIT_CONTROL);
 281
 282         /* See if the panel fitter is in use */
 283         if ((pfit_control & PFIT_ENABLE) == 0)
 284                 return -1;
 285         return (pfit_control >> 29) & 3;
 286 }
 287
 288 static int mrst_crtc_mode_set(struct drm_crtc *crtc,
 289                               struct drm_display_mode *mode,
 290                               struct drm_display_mode *adjusted_mode,
 291                               int x, int y,
 292                               struct drm_framebuffer *old_fb)
 293 {
 294         struct drm_device *dev = crtc->dev;
 295         struct psb_intel_crtc *psb_intel_crtc = to_psb_intel_crtc(crtc);
 296         struct drm_psb_private *dev_priv = dev->dev_private;
 297         int pipe = psb_intel_crtc->pipe;
 298         int fp_reg = (pipe == 0) ? MRST_FPA0 : FPB0;
 299         int dpll_reg = (pipe == 0) ? MRST_DPLL_A : DPLL_B;
 300         int dspcntr_reg = (pipe == 0) ? DSPACNTR : DSPBCNTR;
 301         int pipeconf_reg = (pipe == 0) ? PIPEACONF : PIPEBCONF;
 302         int htot_reg = (pipe == 0) ? HTOTAL_A : HTOTAL_B;
 303         int hblank_reg = (pipe == 0) ? HBLANK_A : HBLANK_B;
 304         int hsync_reg = (pipe == 0) ? HSYNC_A : HSYNC_B;
 305         int vtot_reg = (pipe == 0) ? VTOTAL_A : VTOTAL_B;
 306         int vblank_reg = (pipe == 0) ? VBLANK_A : VBLANK_B;
 307         int vsync_reg = (pipe == 0) ? VSYNC_A : VSYNC_B;
 308         int pipesrc_reg = (pipe == 0) ? PIPEASRC : PIPEBSRC;
 309         int refclk = 0;
 310         struct mrst_clock_t clock;
 311         u32 dpll = 0, fp = 0, dspcntr, pipeconf;
 312         bool ok, is_sdvo = false;
 313         bool is_crt = false, is_lvds = false, is_tv = false;
 314         bool is_mipi = false;
 315         struct drm_mode_config *mode_config = &dev->mode_config;
 316         struct psb_intel_output *psb_intel_output = NULL;
 317         uint64_t scalingType = DRM_MODE_SCALE_FULLSCREEN;
 318         struct drm_encoder *encoder;
 319
 320         if (!gma_power_begin(dev, true))
 321                 return 0;
 322
 323         memcpy(&psb_intel_crtc->saved_mode,
 324                 mode,
 325                 sizeof(struct drm_display_mode));
 326         memcpy(&psb_intel_crtc->saved_adjusted_mode,
 327                 adjusted_mode,
 328                 sizeof(struct drm_display_mode));
 329
 330         list_for_each_entry(encoder, &mode_config->encoder_list, head) {
 331
 332                 if (encoder->crtc != crtc)
 333                         continue;
 334
 335                 psb_intel_output = enc_to_psb_intel_output(encoder);
 336                 switch (psb_intel_output->type) {
 337                 case INTEL_OUTPUT_LVDS:
 338                         is_lvds = true;
 339                         break;
 340                 case INTEL_OUTPUT_SDVO:
 341                         is_sdvo = true;
 342                         break;
 343                 case INTEL_OUTPUT_TVOUT:
 344                         is_tv = true;
 345                         break;
 346                 case INTEL_OUTPUT_ANALOG:
 347                         is_crt = true;
 348                         break;
 349                 case INTEL_OUTPUT_MIPI:
 350                         is_mipi = true;
 351                         break;
 352                 }
 353         }
 354
 355         /* Disable the VGA plane that we never use */
 356         REG_WRITE(VGACNTRL, VGA_DISP_DISABLE);
 357
 358         /* Disable the panel fitter if it was on our pipe */
 359         if (mrst_panel_fitter_pipe(dev) == pipe)
 360                 REG_WRITE(PFIT_CONTROL, 0);
 361
 362         REG_WRITE(pipesrc_reg,
 363                   ((mode->crtc_hdisplay - 1) << 16) |
 364                   (mode->crtc_vdisplay - 1));
 365
 366         if (psb_intel_output)
 367                 drm_connector_property_get_value(&psb_intel_output->base,
 368                         dev->mode_config.scaling_mode_property, &scalingType);
 369
 370         if (scalingType == DRM_MODE_SCALE_NO_SCALE) {
 371                 /* Moorestown doesn't have register support for centering so
 372                  * we need to mess with the h/vblank and h/vsync start and
 373                  * ends to get centering */
 374                 int offsetX = 0, offsetY = 0;
 375
 376                 offsetX = (adjusted_mode->crtc_hdisplay -
 377                            mode->crtc_hdisplay) / 2;
 378                 offsetY = (adjusted_mode->crtc_vdisplay -
 379                            mode->crtc_vdisplay) / 2;
 380
 381                 REG_WRITE(htot_reg, (mode->crtc_hdisplay - 1) |
 382                         ((adjusted_mode->crtc_htotal - 1) << 16));
 383                 REG_WRITE(vtot_reg, (mode->crtc_vdisplay - 1) |
 384                         ((adjusted_mode->crtc_vtotal - 1) << 16));
 385                 REG_WRITE(hblank_reg,
 386                         (adjusted_mode->crtc_hblank_start - offsetX - 1) |
 387                         ((adjusted_mode->crtc_hblank_end - offsetX - 1) << 16));
 388                 REG_WRITE(hsync_reg,
 389                         (adjusted_mode->crtc_hsync_start - offsetX - 1) |
 390                         ((adjusted_mode->crtc_hsync_end - offsetX - 1) << 16));
 391                 REG_WRITE(vblank_reg,
 392                         (adjusted_mode->crtc_vblank_start - offsetY - 1) |
 393                         ((adjusted_mode->crtc_vblank_end - offsetY - 1) << 16));
 394                 REG_WRITE(vsync_reg,
 395                         (adjusted_mode->crtc_vsync_start - offsetY - 1) |
 396                         ((adjusted_mode->crtc_vsync_end - offsetY - 1) << 16));
 397         } else {
 398                 REG_WRITE(htot_reg, (adjusted_mode->crtc_hdisplay - 1) |
 399                         ((adjusted_mode->crtc_htotal - 1) << 16));
 400                 REG_WRITE(vtot_reg, (adjusted_mode->crtc_vdisplay - 1) |
 401                         ((adjusted_mode->crtc_vtotal - 1) << 16));
 402                 REG_WRITE(hblank_reg, (adjusted_mode->crtc_hblank_start - 1) |
 403                         ((adjusted_mode->crtc_hblank_end - 1) << 16));
 404                 REG_WRITE(hsync_reg, (adjusted_mode->crtc_hsync_start - 1) |
 405                         ((adjusted_mode->crtc_hsync_end - 1) << 16));
 406                 REG_WRITE(vblank_reg, (adjusted_mode->crtc_vblank_start - 1) |
 407                         ((adjusted_mode->crtc_vblank_end - 1) << 16));
 408                 REG_WRITE(vsync_reg, (adjusted_mode->crtc_vsync_start - 1) |
 409                         ((adjusted_mode->crtc_vsync_end - 1) << 16));
 410         }
 411
 412         /* Flush the plane changes */
 413         {
 414                 struct drm_crtc_helper_funcs *crtc_funcs =
 415                     crtc->helper_private;
 416                 crtc_funcs->mode_set_base(crtc, x, y, old_fb);
 417         }
 418
 419         /* setup pipeconf */
 420         pipeconf = REG_READ(pipeconf_reg);
 421
 422         /* Set up the display plane register */
 423         dspcntr = REG_READ(dspcntr_reg);
 424         dspcntr |= DISPPLANE_GAMMA_ENABLE;
 425
 426         if (pipe == 0)
 427                 dspcntr |= DISPPLANE_SEL_PIPE_A;
 428         else
 429                 dspcntr |= DISPPLANE_SEL_PIPE_B;
 430
 431         dev_priv->dspcntr = dspcntr |= DISPLAY_PLANE_ENABLE;
 432         dev_priv->pipeconf = pipeconf |= PIPEACONF_ENABLE;
 433
 434         if (is_mipi)
 435                 goto mrst_crtc_mode_set_exit;
 436
 437         refclk = dev_priv->core_freq * 1000;
 438
 439         dpll = 0;               /*BIT16 = 0 for 100MHz reference */
 440
 441         ok = mrstFindBestPLL(crtc, adjusted_mode->clock, refclk, &clock);
 442
 443         if (!ok) {
 444                 dev_dbg(dev->dev, "mrstFindBestPLL fail in mrst_crtc_mode_set.\n");
 445         } else {
 446                 dev_dbg(dev->dev, "mrst_crtc_mode_set pixel clock = %d,"
 447                          "m = %x, p1 = %x.\n", clock.dot, clock.m,
 448                          clock.p1);
 449         }
 450
 451         fp = mrst_m_converts[(clock.m - MRST_M_MIN)] << 8;
 452
 453         dpll |= DPLL_VGA_MODE_DIS;
 454
 455
 456         dpll |= DPLL_VCO_ENABLE;
 457
 458         if (is_lvds)
 459                 dpll |= DPLLA_MODE_LVDS;
 460         else
 461                 dpll |= DPLLB_MODE_DAC_SERIAL;
 462
 463         if (is_sdvo) {
 464                 int sdvo_pixel_multiply =
 465                     adjusted_mode->clock / mode->clock;
 466
 467                 dpll |= DPLL_DVO_HIGH_SPEED;
 468                 dpll |=
 469                     (sdvo_pixel_multiply -
 470                      1) << SDVO_MULTIPLIER_SHIFT_HIRES;
 471         }
 472
 473
 474         /* compute bitmask from p1 value */
 475         dpll |= (1 << (clock.p1 - 2)) << 17;
 476
 477         dpll |= DPLL_VCO_ENABLE;
 478
 479         mrstPrintPll("chosen", &clock);
 480
 481         if (dpll & DPLL_VCO_ENABLE) {
 482                 REG_WRITE(fp_reg, fp);
 483                 REG_WRITE(dpll_reg, dpll & ~DPLL_VCO_ENABLE);
 484                 REG_READ(dpll_reg);
 485                 /* Check the DPLLA lock bit PIPEACONF[29] */
 486                 udelay(150);
 487         }
 488
 489         REG_WRITE(fp_reg, fp);
 490         REG_WRITE(dpll_reg, dpll);
 491         REG_READ(dpll_reg);
 492         /* Wait for the clocks to stabilize. */
 493         udelay(150);
 494
 495         /* write it again -- the BIOS does, after all */
 496         REG_WRITE(dpll_reg, dpll);
 497         REG_READ(dpll_reg);
 498         /* Wait for the clocks to stabilize. */
 499         udelay(150);
 500
 501         REG_WRITE(pipeconf_reg, pipeconf);
 502         REG_READ(pipeconf_reg);
 503         psb_intel_wait_for_vblank(dev);
 504
 505         REG_WRITE(dspcntr_reg, dspcntr);
 506         psb_intel_wait_for_vblank(dev);
 507
 508 mrst_crtc_mode_set_exit:
 509         gma_power_end(dev);
 510         return 0;
 511 }
 512
 513 static bool mrst_crtc_mode_fixup(struct drm_crtc *crtc,
 514                                   struct drm_display_mode *mode,
 515                                   struct drm_display_mode *adjusted_mode)
 516 {
 517         return true;
 518 }
 519
 520 int mrst_pipe_set_base(struct drm_crtc *crtc,
 521                             int x, int y, struct drm_framebuffer *old_fb)
 522 {
 523         struct drm_device *dev = crtc->dev;
 524         struct psb_intel_crtc *psb_intel_crtc = to_psb_intel_crtc(crtc);
 525         struct psb_framebuffer *psbfb = to_psb_fb(crtc->fb);
 526         int pipe = psb_intel_crtc->pipe;
 527         unsigned long start, offset;
 528
 529         int dspbase = (pipe == 0 ? DSPALINOFF : DSPBBASE);
 530         int dspsurf = (pipe == 0 ? DSPASURF : DSPBSURF);
 531         int dspstride = (pipe == 0) ? DSPASTRIDE : DSPBSTRIDE;
 532         int dspcntr_reg = (pipe == 0) ? DSPACNTR : DSPBCNTR;
 533         u32 dspcntr;
 534         int ret = 0;
 535
 536         /* no fb bound */
 537         if (!crtc->fb) {
 538                 dev_dbg(dev->dev, "No FB bound\n");
 539                 return 0;
 540         }
 541
 542         if (!gma_power_begin(dev, true))
 543                 return 0;
 544
 545         start = psbfb->gtt->offset;
 546         offset = y * crtc->fb->pitch + x * (crtc->fb->bits_per_pixel / 8);
 547
 548         REG_WRITE(dspstride, crtc->fb->pitch);
 549
 550         dspcntr = REG_READ(dspcntr_reg);
 551         dspcntr &= ~DISPPLANE_PIXFORMAT_MASK;
 552
 553         switch (crtc->fb->bits_per_pixel) {
 554         case 8:
 555                 dspcntr |= DISPPLANE_8BPP;
 556                 break;
 557         case 16:
 558                 if (crtc->fb->depth == 15)
 559                         dspcntr |= DISPPLANE_15_16BPP;
 560                 else
 561                         dspcntr |= DISPPLANE_16BPP;
 562                 break;
 563         case 24:
 564         case 32:
 565                 dspcntr |= DISPPLANE_32BPP_NO_ALPHA;
 566                 break;
 567         default:
 568                 dev_err(dev->dev, "Unknown color depth\n");
 569                 ret = -EINVAL;
 570                 goto pipe_set_base_exit;
 571         }
 572         REG_WRITE(dspcntr_reg, dspcntr);
 573
 574         REG_WRITE(dspbase, offset);
 575         REG_READ(dspbase);
 576         REG_WRITE(dspsurf, start);
 577         REG_READ(dspsurf);
 578
 579 pipe_set_base_exit:
 580         gma_power_end(dev);
 581         return ret;
 582 }
 583
 584 static void mrst_crtc_prepare(struct drm_crtc *crtc)
 585 {
 586         struct drm_crtc_helper_funcs *crtc_funcs = crtc->helper_private;
 587         crtc_funcs->dpms(crtc, DRM_MODE_DPMS_OFF);
 588 }
 589
 590 static void mrst_crtc_commit(struct drm_crtc *crtc)
 591 {
 592         struct drm_crtc_helper_funcs *crtc_funcs = crtc->helper_private;
 593         crtc_funcs->dpms(crtc, DRM_MODE_DPMS_ON);
 594 }
 595
 596 const struct drm_crtc_helper_funcs mrst_helper_funcs = {
 597         .dpms = mrst_crtc_dpms,
 598         .mode_fixup = mrst_crtc_mode_fixup,
 599         .mode_set = mrst_crtc_mode_set,
 600         .mode_set_base = mrst_pipe_set_base,
 601         .prepare = mrst_crtc_prepare,
 602         .commit = mrst_crtc_commit,
 603 };
 604