drivers/gpu/drm/omapdrm/dss/dss.c

   1 /*
   2  * linux/drivers/video/omap2/dss/dss.c
   3  *
   4  * Copyright (C) 2009 Nokia Corporation
   5  * Author: Tomi Valkeinen <[email protected]>
   6  *
   7  * Some code and ideas taken from drivers/video/omap/ driver
   8  * by Imre Deak.
   9  *
  10  * This program is free software; you can redistribute it and/or modify it
  11  * under the terms of the GNU General Public License version 2 as published by
  12  * the Free Software Foundation.
  13  *
  14  * This program is distributed in the hope that it will be useful, but WITHOUT
  15  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  16  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  17  * more details.
  18  *
  19  * You should have received a copy of the GNU General Public License along with
  20  * this program.  If not, see <http://www.gnu.org/licenses/>.
  21  */
  22
  23 #define DSS_SUBSYS_NAME "DSS"
  24
  25 #include <linux/kernel.h>
  26 #include <linux/module.h>
  27 #include <linux/io.h>
  28 #include <linux/export.h>
  29 #include <linux/err.h>
  30 #include <linux/delay.h>
  31 #include <linux/seq_file.h>
  32 #include <linux/clk.h>
  33 #include <linux/pinctrl/consumer.h>
  34 #include <linux/platform_device.h>
  35 #include <linux/pm_runtime.h>
  36 #include <linux/gfp.h>
  37 #include <linux/sizes.h>
  38 #include <linux/mfd/syscon.h>
  39 #include <linux/regmap.h>
  40 #include <linux/of.h>
  41 #include <linux/regulator/consumer.h>
  42 #include <linux/suspend.h>
  43 #include <linux/component.h>
  44
  45 #include "omapdss.h"
  46 #include "dss.h"
  47 #include "dss_features.h"
  48
  49 #define DSS_SZ_REGS                     SZ_512
  50
  51 struct dss_reg {
  52         u16 idx;
  53 };
  54
  55 #define DSS_REG(idx)                    ((const struct dss_reg) { idx })
  56
  57 #define DSS_REVISION                    DSS_REG(0x0000)
  58 #define DSS_SYSCONFIG                   DSS_REG(0x0010)
  59 #define DSS_SYSSTATUS                   DSS_REG(0x0014)
  60 #define DSS_CONTROL                     DSS_REG(0x0040)
  61 #define DSS_SDI_CONTROL                 DSS_REG(0x0044)
  62 #define DSS_PLL_CONTROL                 DSS_REG(0x0048)
  63 #define DSS_SDI_STATUS                  DSS_REG(0x005C)
  64
  65 #define REG_GET(idx, start, end) \
  66         FLD_GET(dss_read_reg(idx), start, end)
  67
  68 #define REG_FLD_MOD(idx, val, start, end) \
  69         dss_write_reg(idx, FLD_MOD(dss_read_reg(idx), val, start, end))
  70
  71 struct dss_features {
  72         u8 fck_div_max;
  73         u8 dss_fck_multiplier;
  74         const char *parent_clk_name;
  75         const enum omap_display_type *ports;
  76         int num_ports;
  77         int (*dpi_select_source)(int port, enum omap_channel channel);
  78         int (*select_lcd_source)(enum omap_channel channel,
  79                 enum dss_clk_source clk_src);
  80 };
  81
  82 static struct {
  83         struct platform_device *pdev;
  84         void __iomem    *base;
  85         struct regmap   *syscon_pll_ctrl;
  86         u32             syscon_pll_ctrl_offset;
  87
  88         struct clk      *parent_clk;
  89         struct clk      *dss_clk;
  90         unsigned long   dss_clk_rate;
  91
  92         unsigned long   cache_req_pck;
  93         unsigned long   cache_prate;
  94         struct dispc_clock_info cache_dispc_cinfo;
  95
  96         enum dss_clk_source dsi_clk_source[MAX_NUM_DSI];
  97         enum dss_clk_source dispc_clk_source;
  98         enum dss_clk_source lcd_clk_source[MAX_DSS_LCD_MANAGERS];
  99
 100         bool            ctx_valid;
 101         u32             ctx[DSS_SZ_REGS / sizeof(u32)];
 102
 103         const struct dss_features *feat;
 104
 105         struct dss_pll  *video1_pll;
 106         struct dss_pll  *video2_pll;
 107 } dss;
 108
 109 static const char * const dss_generic_clk_source_names[] = {
 110         [DSS_CLK_SRC_FCK]       = "FCK",
 111         [DSS_CLK_SRC_PLL1_1]    = "PLL1:1",
 112         [DSS_CLK_SRC_PLL1_2]    = "PLL1:2",
 113         [DSS_CLK_SRC_PLL1_3]    = "PLL1:3",
 114         [DSS_CLK_SRC_PLL2_1]    = "PLL2:1",
 115         [DSS_CLK_SRC_PLL2_2]    = "PLL2:2",
 116         [DSS_CLK_SRC_PLL2_3]    = "PLL2:3",
 117         [DSS_CLK_SRC_HDMI_PLL]  = "HDMI PLL",
 118 };
 119
 120 static bool dss_initialized;
 121
 122 bool omapdss_is_initialized(void)
 123 {
 124         return dss_initialized;
 125 }
 126 EXPORT_SYMBOL(omapdss_is_initialized);
 127
 128 static inline void dss_write_reg(const struct dss_reg idx, u32 val)
 129 {
 130         __raw_writel(val, dss.base + idx.idx);
 131 }
 132
 133 static inline u32 dss_read_reg(const struct dss_reg idx)
 134 {
 135         return __raw_readl(dss.base + idx.idx);
 136 }
 137
 138 #define SR(reg) \
 139         dss.ctx[(DSS_##reg).idx / sizeof(u32)] = dss_read_reg(DSS_##reg)
 140 #define RR(reg) \
 141         dss_write_reg(DSS_##reg, dss.ctx[(DSS_##reg).idx / sizeof(u32)])
 142
 143 static void dss_save_context(void)
 144 {
 145         DSSDBG("dss_save_context\n");
 146
 147         SR(CONTROL);
 148
 149         if (dss_feat_get_supported_displays(OMAP_DSS_CHANNEL_LCD) &
 150                         OMAP_DISPLAY_TYPE_SDI) {
 151                 SR(SDI_CONTROL);
 152                 SR(PLL_CONTROL);
 153         }
 154
 155         dss.ctx_valid = true;
 156
 157         DSSDBG("context saved\n");
 158 }
 159
 160 static void dss_restore_context(void)
 161 {
 162         DSSDBG("dss_restore_context\n");
 163
 164         if (!dss.ctx_valid)
 165                 return;
 166
 167         RR(CONTROL);
 168
 169         if (dss_feat_get_supported_displays(OMAP_DSS_CHANNEL_LCD) &
 170                         OMAP_DISPLAY_TYPE_SDI) {
 171                 RR(SDI_CONTROL);
 172                 RR(PLL_CONTROL);
 173         }
 174
 175         DSSDBG("context restored\n");
 176 }
 177
 178 #undef SR
 179 #undef RR
 180
 181 void dss_ctrl_pll_enable(enum dss_pll_id pll_id, bool enable)
 182 {
 183         unsigned shift;
 184         unsigned val;
 185
 186         if (!dss.syscon_pll_ctrl)
 187                 return;
 188
 189         val = !enable;
 190
 191         switch (pll_id) {
 192         case DSS_PLL_VIDEO1:
 193                 shift = 0;
 194                 break;
 195         case DSS_PLL_VIDEO2:
 196                 shift = 1;
 197                 break;
 198         case DSS_PLL_HDMI:
 199                 shift = 2;
 200                 break;
 201         default:
 202                 DSSERR("illegal DSS PLL ID %d\n", pll_id);
 203                 return;
 204         }
 205
 206         regmap_update_bits(dss.syscon_pll_ctrl, dss.syscon_pll_ctrl_offset,
 207                 1 << shift, val << shift);
 208 }
 209
 210 static int dss_ctrl_pll_set_control_mux(enum dss_clk_source clk_src,
 211         enum omap_channel channel)
 212 {
 213         unsigned shift, val;
 214
 215         if (!dss.syscon_pll_ctrl)
 216                 return -EINVAL;
 217
 218         switch (channel) {
 219         case OMAP_DSS_CHANNEL_LCD:
 220                 shift = 3;
 221
 222                 switch (clk_src) {
 223                 case DSS_CLK_SRC_PLL1_1:
 224                         val = 0; break;
 225                 case DSS_CLK_SRC_HDMI_PLL:
 226                         val = 1; break;
 227                 default:
 228                         DSSERR("error in PLL mux config for LCD\n");
 229                         return -EINVAL;
 230                 }
 231
 232                 break;
 233         case OMAP_DSS_CHANNEL_LCD2:
 234                 shift = 5;
 235
 236                 switch (clk_src) {
 237                 case DSS_CLK_SRC_PLL1_3:
 238                         val = 0; break;
 239                 case DSS_CLK_SRC_PLL2_3:
 240                         val = 1; break;
 241                 case DSS_CLK_SRC_HDMI_PLL:
 242                         val = 2; break;
 243                 default:
 244                         DSSERR("error in PLL mux config for LCD2\n");
 245                         return -EINVAL;
 246                 }
 247
 248                 break;
 249         case OMAP_DSS_CHANNEL_LCD3:
 250                 shift = 7;
 251
 252                 switch (clk_src) {
 253                 case DSS_CLK_SRC_PLL2_1:
 254                         val = 0; break;
 255                 case DSS_CLK_SRC_PLL1_3:
 256                         val = 1; break;
 257                 case DSS_CLK_SRC_HDMI_PLL:
 258                         val = 2; break;
 259                 default:
 260                         DSSERR("error in PLL mux config for LCD3\n");
 261                         return -EINVAL;
 262                 }
 263
 264                 break;
 265         default:
 266                 DSSERR("error in PLL mux config\n");
 267                 return -EINVAL;
 268         }
 269
 270         regmap_update_bits(dss.syscon_pll_ctrl, dss.syscon_pll_ctrl_offset,
 271                 0x3 << shift, val << shift);
 272
 273         return 0;
 274 }
 275
 276 void dss_sdi_init(int datapairs)
 277 {
 278         u32 l;
 279
 280         BUG_ON(datapairs > 3 || datapairs < 1);
 281
 282         l = dss_read_reg(DSS_SDI_CONTROL);
 283         l = FLD_MOD(l, 0xf, 19, 15);            /* SDI_PDIV */
 284         l = FLD_MOD(l, datapairs-1, 3, 2);      /* SDI_PRSEL */
 285         l = FLD_MOD(l, 2, 1, 0);                /* SDI_BWSEL */
 286         dss_write_reg(DSS_SDI_CONTROL, l);
 287
 288         l = dss_read_reg(DSS_PLL_CONTROL);
 289         l = FLD_MOD(l, 0x7, 25, 22);    /* SDI_PLL_FREQSEL */
 290         l = FLD_MOD(l, 0xb, 16, 11);    /* SDI_PLL_REGN */
 291         l = FLD_MOD(l, 0xb4, 10, 1);    /* SDI_PLL_REGM */
 292         dss_write_reg(DSS_PLL_CONTROL, l);
 293 }
 294
 295 int dss_sdi_enable(void)
 296 {
 297         unsigned long timeout;
 298
 299         dispc_pck_free_enable(1);
 300
 301         /* Reset SDI PLL */
 302         REG_FLD_MOD(DSS_PLL_CONTROL, 1, 18, 18); /* SDI_PLL_SYSRESET */
 303         udelay(1);      /* wait 2x PCLK */
 304
 305         /* Lock SDI PLL */
 306         REG_FLD_MOD(DSS_PLL_CONTROL, 1, 28, 28); /* SDI_PLL_GOBIT */
 307
 308         /* Waiting for PLL lock request to complete */
 309         timeout = jiffies + msecs_to_jiffies(500);
 310         while (dss_read_reg(DSS_SDI_STATUS) & (1 << 6)) {
 311                 if (time_after_eq(jiffies, timeout)) {
 312                         DSSERR("PLL lock request timed out\n");
 313                         goto err1;
 314                 }
 315         }
 316
 317         /* Clearing PLL_GO bit */
 318         REG_FLD_MOD(DSS_PLL_CONTROL, 0, 28, 28);
 319
 320         /* Waiting for PLL to lock */
 321         timeout = jiffies + msecs_to_jiffies(500);
 322         while (!(dss_read_reg(DSS_SDI_STATUS) & (1 << 5))) {
 323                 if (time_after_eq(jiffies, timeout)) {
 324                         DSSERR("PLL lock timed out\n");
 325                         goto err1;
 326                 }
 327         }
 328
 329         dispc_lcd_enable_signal(1);
 330
 331         /* Waiting for SDI reset to complete */
 332         timeout = jiffies + msecs_to_jiffies(500);
 333         while (!(dss_read_reg(DSS_SDI_STATUS) & (1 << 2))) {
 334                 if (time_after_eq(jiffies, timeout)) {
 335                         DSSERR("SDI reset timed out\n");
 336                         goto err2;
 337                 }
 338         }
 339
 340         return 0;
 341
 342  err2:
 343         dispc_lcd_enable_signal(0);
 344  err1:
 345         /* Reset SDI PLL */
 346         REG_FLD_MOD(DSS_PLL_CONTROL, 0, 18, 18); /* SDI_PLL_SYSRESET */
 347
 348         dispc_pck_free_enable(0);
 349
 350         return -ETIMEDOUT;
 351 }
 352
 353 void dss_sdi_disable(void)
 354 {
 355         dispc_lcd_enable_signal(0);
 356
 357         dispc_pck_free_enable(0);
 358
 359         /* Reset SDI PLL */
 360         REG_FLD_MOD(DSS_PLL_CONTROL, 0, 18, 18); /* SDI_PLL_SYSRESET */
 361 }
 362
 363 const char *dss_get_clk_source_name(enum dss_clk_source clk_src)
 364 {
 365         return dss_generic_clk_source_names[clk_src];
 366 }
 367
 368 void dss_dump_clocks(struct seq_file *s)
 369 {
 370         const char *fclk_name;
 371         unsigned long fclk_rate;
 372
 373         if (dss_runtime_get())
 374                 return;
 375
 376         seq_printf(s, "- DSS -\n");
 377
 378         fclk_name = dss_get_clk_source_name(DSS_CLK_SRC_FCK);
 379         fclk_rate = clk_get_rate(dss.dss_clk);
 380
 381         seq_printf(s, "%s = %lu\n",
 382                         fclk_name,
 383                         fclk_rate);
 384
 385         dss_runtime_put();
 386 }
 387
 388 static void dss_dump_regs(struct seq_file *s)
 389 {
 390 #define DUMPREG(r) seq_printf(s, "%-35s %08x\n", #r, dss_read_reg(r))
 391
 392         if (dss_runtime_get())
 393                 return;
 394
 395         DUMPREG(DSS_REVISION);
 396         DUMPREG(DSS_SYSCONFIG);
 397         DUMPREG(DSS_SYSSTATUS);
 398         DUMPREG(DSS_CONTROL);
 399
 400         if (dss_feat_get_supported_displays(OMAP_DSS_CHANNEL_LCD) &
 401                         OMAP_DISPLAY_TYPE_SDI) {
 402                 DUMPREG(DSS_SDI_CONTROL);
 403                 DUMPREG(DSS_PLL_CONTROL);
 404                 DUMPREG(DSS_SDI_STATUS);
 405         }
 406
 407         dss_runtime_put();
 408 #undef DUMPREG
 409 }
 410
 411 static int dss_get_channel_index(enum omap_channel channel)
 412 {
 413         switch (channel) {
 414         case OMAP_DSS_CHANNEL_LCD:
 415                 return 0;
 416         case OMAP_DSS_CHANNEL_LCD2:
 417                 return 1;
 418         case OMAP_DSS_CHANNEL_LCD3:
 419                 return 2;
 420         default:
 421                 WARN_ON(1);
 422                 return 0;
 423         }
 424 }
 425
 426 static void dss_select_dispc_clk_source(enum dss_clk_source clk_src)
 427 {
 428         int b;
 429         u8 start, end;
 430
 431         /*
 432          * We always use PRCM clock as the DISPC func clock, except on DSS3,
 433          * where we don't have separate DISPC and LCD clock sources.
 434          */
 435         if (WARN_ON(dss_has_feature(FEAT_LCD_CLK_SRC) &&
 436                 clk_src != DSS_CLK_SRC_FCK))
 437                 return;
 438
 439         switch (clk_src) {
 440         case DSS_CLK_SRC_FCK:
 441                 b = 0;
 442                 break;
 443         case DSS_CLK_SRC_PLL1_1:
 444                 b = 1;
 445                 break;
 446         case DSS_CLK_SRC_PLL2_1:
 447                 b = 2;
 448                 break;
 449         default:
 450                 BUG();
 451                 return;
 452         }
 453
 454         dss_feat_get_reg_field(FEAT_REG_DISPC_CLK_SWITCH, &start, &end);
 455
 456         REG_FLD_MOD(DSS_CONTROL, b, start, end);        /* DISPC_CLK_SWITCH */
 457
 458         dss.dispc_clk_source = clk_src;
 459 }
 460
 461 void dss_select_dsi_clk_source(int dsi_module,
 462                 enum dss_clk_source clk_src)
 463 {
 464         int b, pos;
 465
 466         switch (clk_src) {
 467         case DSS_CLK_SRC_FCK:
 468                 b = 0;
 469                 break;
 470         case DSS_CLK_SRC_PLL1_2:
 471                 BUG_ON(dsi_module != 0);
 472                 b = 1;
 473                 break;
 474         case DSS_CLK_SRC_PLL2_2:
 475                 BUG_ON(dsi_module != 1);
 476                 b = 1;
 477                 break;
 478         default:
 479                 BUG();
 480                 return;
 481         }
 482
 483         pos = dsi_module == 0 ? 1 : 10;
 484         REG_FLD_MOD(DSS_CONTROL, b, pos, pos);  /* DSIx_CLK_SWITCH */
 485
 486         dss.dsi_clk_source[dsi_module] = clk_src;
 487 }
 488
 489 static int dss_lcd_clk_mux_dra7(enum omap_channel channel,
 490         enum dss_clk_source clk_src)
 491 {
 492         const u8 ctrl_bits[] = {
 493                 [OMAP_DSS_CHANNEL_LCD] = 0,
 494                 [OMAP_DSS_CHANNEL_LCD2] = 12,
 495                 [OMAP_DSS_CHANNEL_LCD3] = 19,
 496         };
 497
 498         u8 ctrl_bit = ctrl_bits[channel];
 499         int r;
 500
 501         if (clk_src == DSS_CLK_SRC_FCK) {
 502                 /* LCDx_CLK_SWITCH */
 503                 REG_FLD_MOD(DSS_CONTROL, 0, ctrl_bit, ctrl_bit);
 504                 return -EINVAL;
 505         }
 506
 507         r = dss_ctrl_pll_set_control_mux(clk_src, channel);
 508         if (r)
 509                 return r;
 510
 511         REG_FLD_MOD(DSS_CONTROL, 1, ctrl_bit, ctrl_bit);
 512
 513         return 0;
 514 }
 515
 516 static int dss_lcd_clk_mux_omap5(enum omap_channel channel,
 517         enum dss_clk_source clk_src)
 518 {
 519         const u8 ctrl_bits[] = {
 520                 [OMAP_DSS_CHANNEL_LCD] = 0,
 521                 [OMAP_DSS_CHANNEL_LCD2] = 12,
 522                 [OMAP_DSS_CHANNEL_LCD3] = 19,
 523         };
 524         const enum dss_clk_source allowed_plls[] = {
 525                 [OMAP_DSS_CHANNEL_LCD] = DSS_CLK_SRC_PLL1_1,
 526                 [OMAP_DSS_CHANNEL_LCD2] = DSS_CLK_SRC_FCK,
 527                 [OMAP_DSS_CHANNEL_LCD3] = DSS_CLK_SRC_PLL2_1,
 528         };
 529
 530         u8 ctrl_bit = ctrl_bits[channel];
 531
 532         if (clk_src == DSS_CLK_SRC_FCK) {
 533                 /* LCDx_CLK_SWITCH */
 534                 REG_FLD_MOD(DSS_CONTROL, 0, ctrl_bit, ctrl_bit);
 535                 return -EINVAL;
 536         }
 537
 538         if (WARN_ON(allowed_plls[channel] != clk_src))
 539                 return -EINVAL;
 540
 541         REG_FLD_MOD(DSS_CONTROL, 1, ctrl_bit, ctrl_bit);
 542
 543         return 0;
 544 }
 545
 546 static int dss_lcd_clk_mux_omap4(enum omap_channel channel,
 547         enum dss_clk_source clk_src)
 548 {
 549         const u8 ctrl_bits[] = {
 550                 [OMAP_DSS_CHANNEL_LCD] = 0,
 551                 [OMAP_DSS_CHANNEL_LCD2] = 12,
 552         };
 553         const enum dss_clk_source allowed_plls[] = {
 554                 [OMAP_DSS_CHANNEL_LCD] = DSS_CLK_SRC_PLL1_1,
 555                 [OMAP_DSS_CHANNEL_LCD2] = DSS_CLK_SRC_PLL2_1,
 556         };
 557
 558         u8 ctrl_bit = ctrl_bits[channel];
 559
 560         if (clk_src == DSS_CLK_SRC_FCK) {
 561                 /* LCDx_CLK_SWITCH */
 562                 REG_FLD_MOD(DSS_CONTROL, 0, ctrl_bit, ctrl_bit);
 563                 return 0;
 564         }
 565
 566         if (WARN_ON(allowed_plls[channel] != clk_src))
 567                 return -EINVAL;
 568
 569         REG_FLD_MOD(DSS_CONTROL, 1, ctrl_bit, ctrl_bit);
 570
 571         return 0;
 572 }
 573
 574 void dss_select_lcd_clk_source(enum omap_channel channel,
 575                 enum dss_clk_source clk_src)
 576 {
 577         int idx = dss_get_channel_index(channel);
 578         int r;
 579
 580         if (!dss_has_feature(FEAT_LCD_CLK_SRC)) {
 581                 dss_select_dispc_clk_source(clk_src);
 582                 dss.lcd_clk_source[idx] = clk_src;
 583                 return;
 584         }
 585
 586         r = dss.feat->select_lcd_source(channel, clk_src);
 587         if (r)
 588                 return;
 589
 590         dss.lcd_clk_source[idx] = clk_src;
 591 }
 592
 593 enum dss_clk_source dss_get_dispc_clk_source(void)
 594 {
 595         return dss.dispc_clk_source;
 596 }
 597
 598 enum dss_clk_source dss_get_dsi_clk_source(int dsi_module)
 599 {
 600         return dss.dsi_clk_source[dsi_module];
 601 }
 602
 603 enum dss_clk_source dss_get_lcd_clk_source(enum omap_channel channel)
 604 {
 605         if (dss_has_feature(FEAT_LCD_CLK_SRC)) {
 606                 int idx = dss_get_channel_index(channel);
 607                 return dss.lcd_clk_source[idx];
 608         } else {
 609                 /* LCD_CLK source is the same as DISPC_FCLK source for
 610                  * OMAP2 and OMAP3 */
 611                 return dss.dispc_clk_source;
 612         }
 613 }
 614
 615 bool dss_div_calc(unsigned long pck, unsigned long fck_min,
 616                 dss_div_calc_func func, void *data)
 617 {
 618         int fckd, fckd_start, fckd_stop;
 619         unsigned long fck;
 620         unsigned long fck_hw_max;
 621         unsigned long fckd_hw_max;
 622         unsigned long prate;
 623         unsigned m;
 624
 625         fck_hw_max = dss_feat_get_param_max(FEAT_PARAM_DSS_FCK);
 626
 627         if (dss.parent_clk == NULL) {
 628                 unsigned pckd;
 629
 630                 pckd = fck_hw_max / pck;
 631
 632                 fck = pck * pckd;
 633
 634                 fck = clk_round_rate(dss.dss_clk, fck);
 635
 636                 return func(fck, data);
 637         }
 638
 639         fckd_hw_max = dss.feat->fck_div_max;
 640
 641         m = dss.feat->dss_fck_multiplier;
 642         prate = clk_get_rate(dss.parent_clk);
 643
 644         fck_min = fck_min ? fck_min : 1;
 645
 646         fckd_start = min(prate * m / fck_min, fckd_hw_max);
 647         fckd_stop = max(DIV_ROUND_UP(prate * m, fck_hw_max), 1ul);
 648
 649         for (fckd = fckd_start; fckd >= fckd_stop; --fckd) {
 650                 fck = DIV_ROUND_UP(prate, fckd) * m;
 651
 652                 if (func(fck, data))
 653                         return true;
 654         }
 655
 656         return false;
 657 }
 658
 659 int dss_set_fck_rate(unsigned long rate)
 660 {
 661         int r;
 662
 663         DSSDBG("set fck to %lu\n", rate);
 664
 665         r = clk_set_rate(dss.dss_clk, rate);
 666         if (r)
 667                 return r;
 668
 669         dss.dss_clk_rate = clk_get_rate(dss.dss_clk);
 670
 671         WARN_ONCE(dss.dss_clk_rate != rate,
 672                         "clk rate mismatch: %lu != %lu", dss.dss_clk_rate,
 673                         rate);
 674
 675         return 0;
 676 }
 677
 678 unsigned long dss_get_dispc_clk_rate(void)
 679 {
 680         return dss.dss_clk_rate;
 681 }
 682
 683 static int dss_setup_default_clock(void)
 684 {
 685         unsigned long max_dss_fck, prate;
 686         unsigned long fck;
 687         unsigned fck_div;
 688         int r;
 689
 690         max_dss_fck = dss_feat_get_param_max(FEAT_PARAM_DSS_FCK);
 691
 692         if (dss.parent_clk == NULL) {
 693                 fck = clk_round_rate(dss.dss_clk, max_dss_fck);
 694         } else {
 695                 prate = clk_get_rate(dss.parent_clk);
 696
 697                 fck_div = DIV_ROUND_UP(prate * dss.feat->dss_fck_multiplier,
 698                                 max_dss_fck);
 699                 fck = DIV_ROUND_UP(prate, fck_div) * dss.feat->dss_fck_multiplier;
 700         }
 701
 702         r = dss_set_fck_rate(fck);
 703         if (r)
 704                 return r;
 705
 706         return 0;
 707 }
 708
 709 void dss_set_venc_output(enum omap_dss_venc_type type)
 710 {
 711         int l = 0;
 712
 713         if (type == OMAP_DSS_VENC_TYPE_COMPOSITE)
 714                 l = 0;
 715         else if (type == OMAP_DSS_VENC_TYPE_SVIDEO)
 716                 l = 1;
 717         else
 718                 BUG();
 719
 720         /* venc out selection. 0 = comp, 1 = svideo */
 721         REG_FLD_MOD(DSS_CONTROL, l, 6, 6);
 722 }
 723
 724 void dss_set_dac_pwrdn_bgz(bool enable)
 725 {
 726         REG_FLD_MOD(DSS_CONTROL, enable, 5, 5); /* DAC Power-Down Control */
 727 }
 728
 729 void dss_select_hdmi_venc_clk_source(enum dss_hdmi_venc_clk_source_select src)
 730 {
 731         enum omap_display_type dp;
 732         dp = dss_feat_get_supported_displays(OMAP_DSS_CHANNEL_DIGIT);
 733
 734         /* Complain about invalid selections */
 735         WARN_ON((src == DSS_VENC_TV_CLK) && !(dp & OMAP_DISPLAY_TYPE_VENC));
 736         WARN_ON((src == DSS_HDMI_M_PCLK) && !(dp & OMAP_DISPLAY_TYPE_HDMI));
 737
 738         /* Select only if we have options */
 739         if ((dp & OMAP_DISPLAY_TYPE_VENC) && (dp & OMAP_DISPLAY_TYPE_HDMI))
 740                 REG_FLD_MOD(DSS_CONTROL, src, 15, 15);  /* VENC_HDMI_SWITCH */
 741 }
 742
 743 enum dss_hdmi_venc_clk_source_select dss_get_hdmi_venc_clk_source(void)
 744 {
 745         enum omap_display_type displays;
 746
 747         displays = dss_feat_get_supported_displays(OMAP_DSS_CHANNEL_DIGIT);
 748         if ((displays & OMAP_DISPLAY_TYPE_HDMI) == 0)
 749                 return DSS_VENC_TV_CLK;
 750
 751         if ((displays & OMAP_DISPLAY_TYPE_VENC) == 0)
 752                 return DSS_HDMI_M_PCLK;
 753
 754         return REG_GET(DSS_CONTROL, 15, 15);
 755 }
 756
 757 static int dss_dpi_select_source_omap2_omap3(int port, enum omap_channel channel)
 758 {
 759         if (channel != OMAP_DSS_CHANNEL_LCD)
 760                 return -EINVAL;
 761
 762         return 0;
 763 }
 764
 765 static int dss_dpi_select_source_omap4(int port, enum omap_channel channel)
 766 {
 767         int val;
 768
 769         switch (channel) {
 770         case OMAP_DSS_CHANNEL_LCD2:
 771                 val = 0;
 772                 break;
 773         case OMAP_DSS_CHANNEL_DIGIT:
 774                 val = 1;
 775                 break;
 776         default:
 777                 return -EINVAL;
 778         }
 779
 780         REG_FLD_MOD(DSS_CONTROL, val, 17, 17);
 781
 782         return 0;
 783 }
 784
 785 static int dss_dpi_select_source_omap5(int port, enum omap_channel channel)
 786 {
 787         int val;
 788
 789         switch (channel) {
 790         case OMAP_DSS_CHANNEL_LCD:
 791                 val = 1;
 792                 break;
 793         case OMAP_DSS_CHANNEL_LCD2:
 794                 val = 2;
 795                 break;
 796         case OMAP_DSS_CHANNEL_LCD3:
 797                 val = 3;
 798                 break;
 799         case OMAP_DSS_CHANNEL_DIGIT:
 800                 val = 0;
 801                 break;
 802         default:
 803                 return -EINVAL;
 804         }
 805
 806         REG_FLD_MOD(DSS_CONTROL, val, 17, 16);
 807
 808         return 0;
 809 }
 810
 811 static int dss_dpi_select_source_dra7xx(int port, enum omap_channel channel)
 812 {
 813         switch (port) {
 814         case 0:
 815                 return dss_dpi_select_source_omap5(port, channel);
 816         case 1:
 817                 if (channel != OMAP_DSS_CHANNEL_LCD2)
 818                         return -EINVAL;
 819                 break;
 820         case 2:
 821                 if (channel != OMAP_DSS_CHANNEL_LCD3)
 822                         return -EINVAL;
 823                 break;
 824         default:
 825                 return -EINVAL;
 826         }
 827
 828         return 0;
 829 }
 830
 831 int dss_dpi_select_source(int port, enum omap_channel channel)
 832 {
 833         return dss.feat->dpi_select_source(port, channel);
 834 }
 835
 836 static int dss_get_clocks(void)
 837 {
 838         struct clk *clk;
 839
 840         clk = devm_clk_get(&dss.pdev->dev, "fck");
 841         if (IS_ERR(clk)) {
 842                 DSSERR("can't get clock fck\n");
 843                 return PTR_ERR(clk);
 844         }
 845
 846         dss.dss_clk = clk;
 847
 848         if (dss.feat->parent_clk_name) {
 849                 clk = clk_get(NULL, dss.feat->parent_clk_name);
 850                 if (IS_ERR(clk)) {
 851                         DSSERR("Failed to get %s\n", dss.feat->parent_clk_name);
 852                         return PTR_ERR(clk);
 853                 }
 854         } else {
 855                 clk = NULL;
 856         }
 857
 858         dss.parent_clk = clk;
 859
 860         return 0;
 861 }
 862
 863 static void dss_put_clocks(void)
 864 {
 865         if (dss.parent_clk)
 866                 clk_put(dss.parent_clk);
 867 }
 868
 869 int dss_runtime_get(void)
 870 {
 871         int r;
 872
 873         DSSDBG("dss_runtime_get\n");
 874
 875         r = pm_runtime_get_sync(&dss.pdev->dev);
 876         WARN_ON(r < 0);
 877         return r < 0 ? r : 0;
 878 }
 879
 880 void dss_runtime_put(void)
 881 {
 882         int r;
 883
 884         DSSDBG("dss_runtime_put\n");
 885
 886         r = pm_runtime_put_sync(&dss.pdev->dev);
 887         WARN_ON(r < 0 && r != -ENOSYS && r != -EBUSY);
 888 }
 889
 890 /* DEBUGFS */
 891 #if defined(CONFIG_OMAP2_DSS_DEBUGFS)
 892 void dss_debug_dump_clocks(struct seq_file *s)
 893 {
 894         dss_dump_clocks(s);
 895         dispc_dump_clocks(s);
 896 #ifdef CONFIG_OMAP2_DSS_DSI
 897         dsi_dump_clocks(s);
 898 #endif
 899 }
 900 #endif
 901
 902
 903 static const enum omap_display_type omap2plus_ports[] = {
 904         OMAP_DISPLAY_TYPE_DPI,
 905 };
 906
 907 static const enum omap_display_type omap34xx_ports[] = {
 908         OMAP_DISPLAY_TYPE_DPI,
 909         OMAP_DISPLAY_TYPE_SDI,
 910 };
 911
 912 static const enum omap_display_type dra7xx_ports[] = {
 913         OMAP_DISPLAY_TYPE_DPI,
 914         OMAP_DISPLAY_TYPE_DPI,
 915         OMAP_DISPLAY_TYPE_DPI,
 916 };
 917
 918 static const struct dss_features omap24xx_dss_feats = {
 919         /*
 920          * fck div max is really 16, but the divider range has gaps. The range
 921          * from 1 to 6 has no gaps, so let's use that as a max.
 922          */
 923         .fck_div_max            =       6,
 924         .dss_fck_multiplier     =       2,
 925         .parent_clk_name        =       "core_ck",
 926         .dpi_select_source      =       &dss_dpi_select_source_omap2_omap3,
 927         .ports                  =       omap2plus_ports,
 928         .num_ports              =       ARRAY_SIZE(omap2plus_ports),
 929 };
 930
 931 static const struct dss_features omap34xx_dss_feats = {
 932         .fck_div_max            =       16,
 933         .dss_fck_multiplier     =       2,
 934         .parent_clk_name        =       "dpll4_ck",
 935         .dpi_select_source      =       &dss_dpi_select_source_omap2_omap3,
 936         .ports                  =       omap34xx_ports,
 937         .num_ports              =       ARRAY_SIZE(omap34xx_ports),
 938 };
 939
 940 static const struct dss_features omap3630_dss_feats = {
 941         .fck_div_max            =       32,
 942         .dss_fck_multiplier     =       1,
 943         .parent_clk_name        =       "dpll4_ck",
 944         .dpi_select_source      =       &dss_dpi_select_source_omap2_omap3,
 945         .ports                  =       omap2plus_ports,
 946         .num_ports              =       ARRAY_SIZE(omap2plus_ports),
 947 };
 948
 949 static const struct dss_features omap44xx_dss_feats = {
 950         .fck_div_max            =       32,
 951         .dss_fck_multiplier     =       1,
 952         .parent_clk_name        =       "dpll_per_x2_ck",
 953         .dpi_select_source      =       &dss_dpi_select_source_omap4,
 954         .ports                  =       omap2plus_ports,
 955         .num_ports              =       ARRAY_SIZE(omap2plus_ports),
 956         .select_lcd_source      =       &dss_lcd_clk_mux_omap4,
 957 };
 958
 959 static const struct dss_features omap54xx_dss_feats = {
 960         .fck_div_max            =       64,
 961         .dss_fck_multiplier     =       1,
 962         .parent_clk_name        =       "dpll_per_x2_ck",
 963         .dpi_select_source      =       &dss_dpi_select_source_omap5,
 964         .ports                  =       omap2plus_ports,
 965         .num_ports              =       ARRAY_SIZE(omap2plus_ports),
 966         .select_lcd_source      =       &dss_lcd_clk_mux_omap5,
 967 };
 968
 969 static const struct dss_features am43xx_dss_feats = {
 970         .fck_div_max            =       0,
 971         .dss_fck_multiplier     =       0,
 972         .parent_clk_name        =       NULL,
 973         .dpi_select_source      =       &dss_dpi_select_source_omap2_omap3,
 974         .ports                  =       omap2plus_ports,
 975         .num_ports              =       ARRAY_SIZE(omap2plus_ports),
 976 };
 977
 978 static const struct dss_features dra7xx_dss_feats = {
 979         .fck_div_max            =       64,
 980         .dss_fck_multiplier     =       1,
 981         .parent_clk_name        =       "dpll_per_x2_ck",
 982         .dpi_select_source      =       &dss_dpi_select_source_dra7xx,
 983         .ports                  =       dra7xx_ports,
 984         .num_ports              =       ARRAY_SIZE(dra7xx_ports),
 985         .select_lcd_source      =       &dss_lcd_clk_mux_dra7,
 986 };
 987
 988 static int dss_init_features(struct platform_device *pdev)
 989 {
 990         const struct dss_features *src;
 991         struct dss_features *dst;
 992
 993         dst = devm_kzalloc(&pdev->dev, sizeof(*dst), GFP_KERNEL);
 994         if (!dst) {
 995                 dev_err(&pdev->dev, "Failed to allocate local DSS Features\n");
 996                 return -ENOMEM;
 997         }
 998
 999         switch (omapdss_get_version()) {
1000         case OMAPDSS_VER_OMAP24xx:
1001                 src = &omap24xx_dss_feats;
1002                 break;
1003
1004         case OMAPDSS_VER_OMAP34xx_ES1:
1005         case OMAPDSS_VER_OMAP34xx_ES3:
1006         case OMAPDSS_VER_AM35xx:
1007                 src = &omap34xx_dss_feats;
1008                 break;
1009
1010         case OMAPDSS_VER_OMAP3630:
1011                 src = &omap3630_dss_feats;
1012                 break;
1013
1014         case OMAPDSS_VER_OMAP4430_ES1:
1015         case OMAPDSS_VER_OMAP4430_ES2:
1016         case OMAPDSS_VER_OMAP4:
1017                 src = &omap44xx_dss_feats;
1018                 break;
1019
1020         case OMAPDSS_VER_OMAP5:
1021                 src = &omap54xx_dss_feats;
1022                 break;
1023
1024         case OMAPDSS_VER_AM43xx:
1025                 src = &am43xx_dss_feats;
1026                 break;
1027
1028         case OMAPDSS_VER_DRA7xx:
1029                 src = &dra7xx_dss_feats;
1030                 break;
1031
1032         default:
1033                 return -ENODEV;
1034         }
1035
1036         memcpy(dst, src, sizeof(*dst));
1037         dss.feat = dst;
1038
1039         return 0;
1040 }
1041
1042 static int dss_init_ports(struct platform_device *pdev)
1043 {
1044         struct device_node *parent = pdev->dev.of_node;
1045         struct device_node *port;
1046         int r;
1047
1048         if (parent == NULL)
1049                 return 0;
1050
1051         port = omapdss_of_get_next_port(parent, NULL);
1052         if (!port)
1053                 return 0;
1054
1055         if (dss.feat->num_ports == 0)
1056                 return 0;
1057
1058         do {
1059                 enum omap_display_type port_type;
1060                 u32 reg;
1061
1062                 r = of_property_read_u32(port, "reg", &reg);
1063                 if (r)
1064                         reg = 0;
1065
1066                 if (reg >= dss.feat->num_ports)
1067                         continue;
1068
1069                 port_type = dss.feat->ports[reg];
1070
1071                 switch (port_type) {
1072                 case OMAP_DISPLAY_TYPE_DPI:
1073                         dpi_init_port(pdev, port);
1074                         break;
1075                 case OMAP_DISPLAY_TYPE_SDI:
1076                         sdi_init_port(pdev, port);
1077                         break;
1078                 default:
1079                         break;
1080                 }
1081         } while ((port = omapdss_of_get_next_port(parent, port)) != NULL);
1082
1083         return 0;
1084 }
1085
1086 static void dss_uninit_ports(struct platform_device *pdev)
1087 {
1088         struct device_node *parent = pdev->dev.of_node;
1089         struct device_node *port;
1090
1091         if (parent == NULL)
1092                 return;
1093
1094         port = omapdss_of_get_next_port(parent, NULL);
1095         if (!port)
1096                 return;
1097
1098         if (dss.feat->num_ports == 0)
1099                 return;
1100
1101         do {
1102                 enum omap_display_type port_type;
1103                 u32 reg;
1104                 int r;
1105
1106                 r = of_property_read_u32(port, "reg", &reg);
1107                 if (r)
1108                         reg = 0;
1109
1110                 if (reg >= dss.feat->num_ports)
1111                         continue;
1112
1113                 port_type = dss.feat->ports[reg];
1114
1115                 switch (port_type) {
1116                 case OMAP_DISPLAY_TYPE_DPI:
1117                         dpi_uninit_port(port);
1118                         break;
1119                 case OMAP_DISPLAY_TYPE_SDI:
1120                         sdi_uninit_port(port);
1121                         break;
1122                 default:
1123                         break;
1124                 }
1125         } while ((port = omapdss_of_get_next_port(parent, port)) != NULL);
1126 }
1127
1128 static int dss_video_pll_probe(struct platform_device *pdev)
1129 {
1130         struct device_node *np = pdev->dev.of_node;
1131         struct regulator *pll_regulator;
1132         int r;
1133
1134         if (!np)
1135                 return 0;
1136
1137         if (of_property_read_bool(np, "syscon-pll-ctrl")) {
1138                 dss.syscon_pll_ctrl = syscon_regmap_lookup_by_phandle(np,
1139                         "syscon-pll-ctrl");
1140                 if (IS_ERR(dss.syscon_pll_ctrl)) {
1141                         dev_err(&pdev->dev,
1142                                 "failed to get syscon-pll-ctrl regmap\n");
1143                         return PTR_ERR(dss.syscon_pll_ctrl);
1144                 }
1145
1146                 if (of_property_read_u32_index(np, "syscon-pll-ctrl", 1,
1147                                 &dss.syscon_pll_ctrl_offset)) {
1148                         dev_err(&pdev->dev,
1149                                 "failed to get syscon-pll-ctrl offset\n");
1150                         return -EINVAL;
1151                 }
1152         }
1153
1154         pll_regulator = devm_regulator_get(&pdev->dev, "vdda_video");
1155         if (IS_ERR(pll_regulator)) {
1156                 r = PTR_ERR(pll_regulator);
1157
1158                 switch (r) {
1159                 case -ENOENT:
1160                         pll_regulator = NULL;
1161                         break;
1162
1163                 case -EPROBE_DEFER:
1164                         return -EPROBE_DEFER;
1165
1166                 default:
1167                         DSSERR("can't get DPLL VDDA regulator\n");
1168                         return r;
1169                 }
1170         }
1171
1172         if (of_property_match_string(np, "reg-names", "pll1") >= 0) {
1173                 dss.video1_pll = dss_video_pll_init(pdev, 0, pll_regulator);
1174                 if (IS_ERR(dss.video1_pll))
1175                         return PTR_ERR(dss.video1_pll);
1176         }
1177
1178         if (of_property_match_string(np, "reg-names", "pll2") >= 0) {
1179                 dss.video2_pll = dss_video_pll_init(pdev, 1, pll_regulator);
1180                 if (IS_ERR(dss.video2_pll)) {
1181                         dss_video_pll_uninit(dss.video1_pll);
1182                         return PTR_ERR(dss.video2_pll);
1183                 }
1184         }
1185
1186         return 0;
1187 }
1188
1189 /* DSS HW IP initialisation */
1190 static int dss_bind(struct device *dev)
1191 {
1192         struct platform_device *pdev = to_platform_device(dev);
1193         struct resource *dss_mem;
1194         u32 rev;
1195         int r;
1196
1197         dss.pdev = pdev;
1198
1199         r = dss_init_features(dss.pdev);
1200         if (r)
1201                 return r;
1202
1203         dss_mem = platform_get_resource(dss.pdev, IORESOURCE_MEM, 0);
1204         if (!dss_mem) {
1205                 DSSERR("can't get IORESOURCE_MEM DSS\n");
1206                 return -EINVAL;
1207         }
1208
1209         dss.base = devm_ioremap(&pdev->dev, dss_mem->start,
1210                                 resource_size(dss_mem));
1211         if (!dss.base) {
1212                 DSSERR("can't ioremap DSS\n");
1213                 return -ENOMEM;
1214         }
1215
1216         r = dss_get_clocks();
1217         if (r)
1218                 return r;
1219
1220         r = dss_setup_default_clock();
1221         if (r)
1222                 goto err_setup_clocks;
1223
1224         r = dss_video_pll_probe(pdev);
1225         if (r)
1226                 goto err_pll_init;
1227
1228         r = dss_init_ports(pdev);
1229         if (r)
1230                 goto err_init_ports;
1231
1232         pm_runtime_enable(&pdev->dev);
1233
1234         r = dss_runtime_get();
1235         if (r)
1236                 goto err_runtime_get;
1237
1238         dss.dss_clk_rate = clk_get_rate(dss.dss_clk);
1239
1240         /* Select DPLL */
1241         REG_FLD_MOD(DSS_CONTROL, 0, 0, 0);
1242
1243         dss_select_dispc_clk_source(DSS_CLK_SRC_FCK);
1244
1245 #ifdef CONFIG_OMAP2_DSS_VENC
1246         REG_FLD_MOD(DSS_CONTROL, 1, 4, 4);      /* venc dac demen */
1247         REG_FLD_MOD(DSS_CONTROL, 1, 3, 3);      /* venc clock 4x enable */
1248         REG_FLD_MOD(DSS_CONTROL, 0, 2, 2);      /* venc clock mode = normal */
1249 #endif
1250         dss.dsi_clk_source[0] = DSS_CLK_SRC_FCK;
1251         dss.dsi_clk_source[1] = DSS_CLK_SRC_FCK;
1252         dss.dispc_clk_source = DSS_CLK_SRC_FCK;
1253         dss.lcd_clk_source[0] = DSS_CLK_SRC_FCK;
1254         dss.lcd_clk_source[1] = DSS_CLK_SRC_FCK;
1255
1256         rev = dss_read_reg(DSS_REVISION);
1257         printk(KERN_INFO "OMAP DSS rev %d.%d\n",
1258                         FLD_GET(rev, 7, 4), FLD_GET(rev, 3, 0));
1259
1260         dss_runtime_put();
1261
1262         r = component_bind_all(&pdev->dev, NULL);
1263         if (r)
1264                 goto err_component;
1265
1266         dss_debugfs_create_file("dss", dss_dump_regs);
1267
1268         pm_set_vt_switch(0);
1269
1270         dss_initialized = true;
1271
1272         return 0;
1273
1274 err_component:
1275 err_runtime_get:
1276         pm_runtime_disable(&pdev->dev);
1277         dss_uninit_ports(pdev);
1278 err_init_ports:
1279         if (dss.video1_pll)
1280                 dss_video_pll_uninit(dss.video1_pll);
1281
1282         if (dss.video2_pll)
1283                 dss_video_pll_uninit(dss.video2_pll);
1284 err_pll_init:
1285 err_setup_clocks:
1286         dss_put_clocks();
1287         return r;
1288 }
1289
1290 static void dss_unbind(struct device *dev)
1291 {
1292         struct platform_device *pdev = to_platform_device(dev);
1293
1294         dss_initialized = false;
1295
1296         component_unbind_all(&pdev->dev, NULL);
1297
1298         if (dss.video1_pll)
1299                 dss_video_pll_uninit(dss.video1_pll);
1300
1301         if (dss.video2_pll)
1302                 dss_video_pll_uninit(dss.video2_pll);
1303
1304         dss_uninit_ports(pdev);
1305
1306         pm_runtime_disable(&pdev->dev);
1307
1308         dss_put_clocks();
1309 }
1310
1311 static const struct component_master_ops dss_component_ops = {
1312         .bind = dss_bind,
1313         .unbind = dss_unbind,
1314 };
1315
1316 static int dss_component_compare(struct device *dev, void *data)
1317 {
1318         struct device *child = data;
1319         return dev == child;
1320 }
1321
1322 static int dss_add_child_component(struct device *dev, void *data)
1323 {
1324         struct component_match **match = data;
1325
1326         /*
1327          * HACK
1328          * We don't have a working driver for rfbi, so skip it here always.
1329          * Otherwise dss will never get probed successfully, as it will wait
1330          * for rfbi to get probed.
1331          */
1332         if (strstr(dev_name(dev), "rfbi"))
1333                 return 0;
1334
1335         component_match_add(dev->parent, match, dss_component_compare, dev);
1336
1337         return 0;
1338 }
1339
1340 static int dss_probe(struct platform_device *pdev)
1341 {
1342         struct component_match *match = NULL;
1343         int r;
1344
1345         /* add all the child devices as components */
1346         device_for_each_child(&pdev->dev, &match, dss_add_child_component);
1347
1348         r = component_master_add_with_match(&pdev->dev, &dss_component_ops, match);
1349         if (r)
1350                 return r;
1351
1352         return 0;
1353 }
1354
1355 static int dss_remove(struct platform_device *pdev)
1356 {
1357         component_master_del(&pdev->dev, &dss_component_ops);
1358         return 0;
1359 }
1360
1361 static int dss_runtime_suspend(struct device *dev)
1362 {
1363         dss_save_context();
1364         dss_set_min_bus_tput(dev, 0);
1365
1366         pinctrl_pm_select_sleep_state(dev);
1367
1368         return 0;
1369 }
1370
1371 static int dss_runtime_resume(struct device *dev)
1372 {
1373         int r;
1374
1375         pinctrl_pm_select_default_state(dev);
1376
1377         /*
1378          * Set an arbitrarily high tput request to ensure OPP100.
1379          * What we should really do is to make a request to stay in OPP100,
1380          * without any tput requirements, but that is not currently possible
1381          * via the PM layer.
1382          */
1383
1384         r = dss_set_min_bus_tput(dev, 1000000000);
1385         if (r)
1386                 return r;
1387
1388         dss_restore_context();
1389         return 0;
1390 }
1391
1392 static const struct dev_pm_ops dss_pm_ops = {
1393         .runtime_suspend = dss_runtime_suspend,
1394         .runtime_resume = dss_runtime_resume,
1395 };
1396
1397 static const struct of_device_id dss_of_match[] = {
1398         { .compatible = "ti,omap2-dss", },
1399         { .compatible = "ti,omap3-dss", },
1400         { .compatible = "ti,omap4-dss", },
1401         { .compatible = "ti,omap5-dss", },
1402         { .compatible = "ti,dra7-dss", },
1403         {},
1404 };
1405
1406 MODULE_DEVICE_TABLE(of, dss_of_match);
1407
1408 static struct platform_driver omap_dsshw_driver = {
1409         .probe          = dss_probe,
1410         .remove         = dss_remove,
1411         .driver         = {
1412                 .name   = "omapdss_dss",
1413                 .pm     = &dss_pm_ops,
1414                 .of_match_table = dss_of_match,
1415                 .suppress_bind_attrs = true,
1416         },
1417 };
1418
1419 int __init dss_init_platform_driver(void)
1420 {
1421         return platform_driver_register(&omap_dsshw_driver);
1422 }
1423
1424 void dss_uninit_platform_driver(void)
1425 {
1426         platform_driver_unregister(&omap_dsshw_driver);
1427 }