drivers/gpu/drm/rcar-du/rcar_du_crtc.c

   1 /*
   2  * rcar_du_crtc.c  --  R-Car Display Unit CRTCs
   3  *
   4  * Copyright (C) 2013-2015 Renesas Electronics Corporation
   5  *
   6  * Contact: Laurent Pinchart (laurent.pinchart@ideasonboard.com)
   7  *
   8  * This program is free software; you can redistribute it and/or modify
   9  * it under the terms of the GNU General Public License as published by
  10  * the Free Software Foundation; either version 2 of the License, or
  11  * (at your option) any later version.
  12  */
  13
  14 #include <linux/clk.h>
  15 #include <linux/mutex.h>
  16 #include <linux/sys_soc.h>
  17
  18 #include <drm/drmP.h>
  19 #include <drm/drm_atomic.h>
  20 #include <drm/drm_atomic_helper.h>
  21 #include <drm/drm_crtc.h>
  22 #include <drm/drm_crtc_helper.h>
  23 #include <drm/drm_fb_cma_helper.h>
  24 #include <drm/drm_gem_cma_helper.h>
  25 #include <drm/drm_plane_helper.h>
  26
  27 #include "rcar_du_crtc.h"
  28 #include "rcar_du_drv.h"
  29 #include "rcar_du_kms.h"
  30 #include "rcar_du_plane.h"
  31 #include "rcar_du_regs.h"
  32 #include "rcar_du_vsp.h"
  33
  34 static u32 rcar_du_crtc_read(struct rcar_du_crtc *rcrtc, u32 reg)
  35 {
  36         struct rcar_du_device *rcdu = rcrtc->group->dev;
  37
  38         return rcar_du_read(rcdu, rcrtc->mmio_offset + reg);
  39 }
  40
  41 static void rcar_du_crtc_write(struct rcar_du_crtc *rcrtc, u32 reg, u32 data)
  42 {
  43         struct rcar_du_device *rcdu = rcrtc->group->dev;
  44
  45         rcar_du_write(rcdu, rcrtc->mmio_offset + reg, data);
  46 }
  47
  48 static void rcar_du_crtc_clr(struct rcar_du_crtc *rcrtc, u32 reg, u32 clr)
  49 {
  50         struct rcar_du_device *rcdu = rcrtc->group->dev;
  51
  52         rcar_du_write(rcdu, rcrtc->mmio_offset + reg,
  53                       rcar_du_read(rcdu, rcrtc->mmio_offset + reg) & ~clr);
  54 }
  55
  56 static void rcar_du_crtc_set(struct rcar_du_crtc *rcrtc, u32 reg, u32 set)
  57 {
  58         struct rcar_du_device *rcdu = rcrtc->group->dev;
  59
  60         rcar_du_write(rcdu, rcrtc->mmio_offset + reg,
  61                       rcar_du_read(rcdu, rcrtc->mmio_offset + reg) | set);
  62 }
  63
  64 static void rcar_du_crtc_clr_set(struct rcar_du_crtc *rcrtc, u32 reg,
  65                                  u32 clr, u32 set)
  66 {
  67         struct rcar_du_device *rcdu = rcrtc->group->dev;
  68         u32 value = rcar_du_read(rcdu, rcrtc->mmio_offset + reg);
  69
  70         rcar_du_write(rcdu, rcrtc->mmio_offset + reg, (value & ~clr) | set);
  71 }
  72
  73 static int rcar_du_crtc_get(struct rcar_du_crtc *rcrtc)
  74 {
  75         int ret;
  76
  77         ret = clk_prepare_enable(rcrtc->clock);
  78         if (ret < 0)
  79                 return ret;
  80
  81         ret = clk_prepare_enable(rcrtc->extclock);
  82         if (ret < 0)
  83                 goto error_clock;
  84
  85         ret = rcar_du_group_get(rcrtc->group);
  86         if (ret < 0)
  87                 goto error_group;
  88
  89         return 0;
  90
  91 error_group:
  92         clk_disable_unprepare(rcrtc->extclock);
  93 error_clock:
  94         clk_disable_unprepare(rcrtc->clock);
  95         return ret;
  96 }
  97
  98 static void rcar_du_crtc_put(struct rcar_du_crtc *rcrtc)
  99 {
 100         rcar_du_group_put(rcrtc->group);
 101
 102         clk_disable_unprepare(rcrtc->extclock);
 103         clk_disable_unprepare(rcrtc->clock);
 104 }
 105
 106 /* -----------------------------------------------------------------------------
 107  * Hardware Setup
 108  */
 109
 110 struct dpll_info {
 111         unsigned int output;
 112         unsigned int fdpll;
 113         unsigned int n;
 114         unsigned int m;
 115 };
 116
 117 static void rcar_du_dpll_divider(struct rcar_du_crtc *rcrtc,
 118                                  struct dpll_info *dpll,
 119                                  unsigned long input,
 120                                  unsigned long target)
 121 {
 122         unsigned long best_diff = (unsigned long)-1;
 123         unsigned long diff;
 124         unsigned int fdpll;
 125         unsigned int m;
 126         unsigned int n;
 127
 128         /*
 129          *   fin                                 fvco        fout       fclkout
 130          * in --> [1/M] --> |PD| -> [LPF] -> [VCO] -> [1/P] -+-> [1/FDPLL] -> out
 131          *              +-> |  |                             |
 132          *              |                                    |
 133          *              +---------------- [1/N] <------------+
 134          *
 135          *      fclkout = fvco / P / FDPLL -- (1)
 136          *
 137          * fin/M = fvco/P/N
 138          *
 139          *      fvco = fin * P *  N / M -- (2)
 140          *
 141          * (1) + (2) indicates
 142          *
 143          *      fclkout = fin * N / M / FDPLL
 144          *
 145          * NOTES
 146          *      N       : (n + 1)
 147          *      M       : (m + 1)
 148          *      FDPLL   : (fdpll + 1)
 149          *      P       : 2
 150          *      2kHz < fvco < 4096MHz
 151          *
 152          * To minimize the jitter,
 153          * N : as large as possible
 154          * M : as small as possible
 155          */
 156         for (m = 0; m < 4; m++) {
 157                 for (n = 119; n > 38; n--) {
 158                         /*
 159                          * This code only runs on 64-bit architectures, the
 160                          * unsigned long type can thus be used for 64-bit
 161                          * computation. It will still compile without any
 162                          * warning on 32-bit architectures.
 163                          *
 164                          * To optimize calculations, use fout instead of fvco
 165                          * to verify the VCO frequency constraint.
 166                          */
 167                         unsigned long fout = input * (n + 1) / (m + 1);
 168
 169                         if (fout < 1000 || fout > 2048 * 1000 * 1000U)
 170                                 continue;
 171
 172                         for (fdpll = 1; fdpll < 32; fdpll++) {
 173                                 unsigned long output;
 174
 175                                 output = fout / (fdpll + 1);
 176                                 if (output >= 400 * 1000 * 1000)
 177                                         continue;
 178
 179                                 diff = abs((long)output - (long)target);
 180                                 if (best_diff > diff) {
 181                                         best_diff = diff;
 182                                         dpll->n = n;
 183                                         dpll->m = m;
 184                                         dpll->fdpll = fdpll;
 185                                         dpll->output = output;
 186                                 }
 187
 188                                 if (diff == 0)
 189                                         goto done;
 190                         }
 191                 }
 192         }
 193
 194 done:
 195         dev_dbg(rcrtc->group->dev->dev,
 196                 "output:%u, fdpll:%u, n:%u, m:%u, diff:%lu\n",
 197                  dpll->output, dpll->fdpll, dpll->n, dpll->m,
 198                  best_diff);
 199 }
 200
 201 static const struct soc_device_attribute rcar_du_r8a7795_es1[] = {
 202         { .soc_id = "r8a7795", .revision = "ES1.*" },
 203         { /* sentinel */ }
 204 };
 205
 206 static void rcar_du_crtc_set_display_timing(struct rcar_du_crtc *rcrtc)
 207 {
 208         const struct drm_display_mode *mode = &rcrtc->crtc.state->adjusted_mode;
 209         struct rcar_du_device *rcdu = rcrtc->group->dev;
 210         unsigned long mode_clock = mode->clock * 1000;
 211         unsigned long clk;
 212         u32 value;
 213         u32 escr;
 214         u32 div;
 215
 216         /*
 217          * Compute the clock divisor and select the internal or external dot
 218          * clock based on the requested frequency.
 219          */
 220         clk = clk_get_rate(rcrtc->clock);
 221         div = DIV_ROUND_CLOSEST(clk, mode_clock);
 222         div = clamp(div, 1U, 64U) - 1;
 223         escr = div | ESCR_DCLKSEL_CLKS;
 224
 225         if (rcrtc->extclock) {
 226                 struct dpll_info dpll = { 0 };
 227                 unsigned long extclk;
 228                 unsigned long extrate;
 229                 unsigned long rate;
 230                 u32 extdiv;
 231
 232                 extclk = clk_get_rate(rcrtc->extclock);
 233                 if (rcdu->info->dpll_ch & (1 << rcrtc->index)) {
 234                         unsigned long target = mode_clock;
 235
 236                         /*
 237                          * The H3 ES1.x exhibits dot clock duty cycle stability
 238                          * issues. We can work around them by configuring the
 239                          * DPLL to twice the desired frequency, coupled with a
 240                          * /2 post-divider. This isn't needed on other SoCs and
 241                          * breaks HDMI output on M3-W for a currently unknown
 242                          * reason, so restrict the workaround to H3 ES1.x.
 243                          */
 244                         if (soc_device_match(rcar_du_r8a7795_es1))
 245                                 target *= 2;
 246
 247                         rcar_du_dpll_divider(rcrtc, &dpll, extclk, target);
 248                         extclk = dpll.output;
 249                 }
 250
 251                 extdiv = DIV_ROUND_CLOSEST(extclk, mode_clock);
 252                 extdiv = clamp(extdiv, 1U, 64U) - 1;
 253
 254                 rate = clk / (div + 1);
 255                 extrate = extclk / (extdiv + 1);
 256
 257                 if (abs((long)extrate - (long)mode_clock) <
 258                     abs((long)rate - (long)mode_clock)) {
 259
 260                         if (rcdu->info->dpll_ch & (1 << rcrtc->index)) {
 261                                 u32 dpllcr = DPLLCR_CODE | DPLLCR_CLKE
 262                                            | DPLLCR_FDPLL(dpll.fdpll)
 263                                            | DPLLCR_N(dpll.n) | DPLLCR_M(dpll.m)
 264                                            | DPLLCR_STBY;
 265
 266                                 if (rcrtc->index == 1)
 267                                         dpllcr |= DPLLCR_PLCS1
 268                                                |  DPLLCR_INCS_DOTCLKIN1;
 269                                 else
 270                                         dpllcr |= DPLLCR_PLCS0
 271                                                |  DPLLCR_INCS_DOTCLKIN0;
 272
 273                                 rcar_du_group_write(rcrtc->group, DPLLCR,
 274                                                     dpllcr);
 275                         }
 276
 277                         escr = ESCR_DCLKSEL_DCLKIN | extdiv;
 278                 }
 279
 280                 dev_dbg(rcrtc->group->dev->dev,
 281                         "mode clock %lu extrate %lu rate %lu ESCR 0x%08x\n",
 282                         mode_clock, extrate, rate, escr);
 283         }
 284
 285         rcar_du_group_write(rcrtc->group, rcrtc->index % 2 ? ESCR2 : ESCR,
 286                             escr);
 287         rcar_du_group_write(rcrtc->group, rcrtc->index % 2 ? OTAR2 : OTAR, 0);
 288
 289         /* Signal polarities */
 290         value = ((mode->flags & DRM_MODE_FLAG_PVSYNC) ? DSMR_VSL : 0)
 291               | ((mode->flags & DRM_MODE_FLAG_PHSYNC) ? DSMR_HSL : 0)
 292               | DSMR_DIPM_DISP | DSMR_CSPM;
 293         rcar_du_crtc_write(rcrtc, DSMR, value);
 294
 295         /* Display timings */
 296         rcar_du_crtc_write(rcrtc, HDSR, mode->htotal - mode->hsync_start - 19);
 297         rcar_du_crtc_write(rcrtc, HDER, mode->htotal - mode->hsync_start +
 298                                         mode->hdisplay - 19);
 299         rcar_du_crtc_write(rcrtc, HSWR, mode->hsync_end -
 300                                         mode->hsync_start - 1);
 301         rcar_du_crtc_write(rcrtc, HCR,  mode->htotal - 1);
 302
 303         rcar_du_crtc_write(rcrtc, VDSR, mode->crtc_vtotal -
 304                                         mode->crtc_vsync_end - 2);
 305         rcar_du_crtc_write(rcrtc, VDER, mode->crtc_vtotal -
 306                                         mode->crtc_vsync_end +
 307                                         mode->crtc_vdisplay - 2);
 308         rcar_du_crtc_write(rcrtc, VSPR, mode->crtc_vtotal -
 309                                         mode->crtc_vsync_end +
 310                                         mode->crtc_vsync_start - 1);
 311         rcar_du_crtc_write(rcrtc, VCR,  mode->crtc_vtotal - 1);
 312
 313         rcar_du_crtc_write(rcrtc, DESR,  mode->htotal - mode->hsync_start - 1);
 314         rcar_du_crtc_write(rcrtc, DEWR,  mode->hdisplay);
 315 }
 316
 317 void rcar_du_crtc_route_output(struct drm_crtc *crtc,
 318                                enum rcar_du_output output)
 319 {
 320         struct rcar_du_crtc *rcrtc = to_rcar_crtc(crtc);
 321         struct rcar_du_device *rcdu = rcrtc->group->dev;
 322
 323         /*
 324          * Store the route from the CRTC output to the DU output. The DU will be
 325          * configured when starting the CRTC.
 326          */
 327         rcrtc->outputs |= BIT(output);
 328
 329         /*
 330          * Store RGB routing to DPAD0, the hardware will be configured when
 331          * starting the CRTC.
 332          */
 333         if (output == RCAR_DU_OUTPUT_DPAD0)
 334                 rcdu->dpad0_source = rcrtc->index;
 335 }
 336
 337 static unsigned int plane_zpos(struct rcar_du_plane *plane)
 338 {
 339         return plane->plane.state->normalized_zpos;
 340 }
 341
 342 static const struct rcar_du_format_info *
 343 plane_format(struct rcar_du_plane *plane)
 344 {
 345         return to_rcar_plane_state(plane->plane.state)->format;
 346 }
 347
 348 static void rcar_du_crtc_update_planes(struct rcar_du_crtc *rcrtc)
 349 {
 350         struct rcar_du_plane *planes[RCAR_DU_NUM_HW_PLANES];
 351         struct rcar_du_device *rcdu = rcrtc->group->dev;
 352         unsigned int num_planes = 0;
 353         unsigned int dptsr_planes;
 354         unsigned int hwplanes = 0;
 355         unsigned int prio = 0;
 356         unsigned int i;
 357         u32 dspr = 0;
 358
 359         for (i = 0; i < rcrtc->group->num_planes; ++i) {
 360                 struct rcar_du_plane *plane = &rcrtc->group->planes[i];
 361                 unsigned int j;
 362
 363                 if (plane->plane.state->crtc != &rcrtc->crtc ||
 364                     !plane->plane.state->visible)
 365                         continue;
 366
 367                 /* Insert the plane in the sorted planes array. */
 368                 for (j = num_planes++; j > 0; --j) {
 369                         if (plane_zpos(planes[j-1]) <= plane_zpos(plane))
 370                                 break;
 371                         planes[j] = planes[j-1];
 372                 }
 373
 374                 planes[j] = plane;
 375                 prio += plane_format(plane)->planes * 4;
 376         }
 377
 378         for (i = 0; i < num_planes; ++i) {
 379                 struct rcar_du_plane *plane = planes[i];
 380                 struct drm_plane_state *state = plane->plane.state;
 381                 unsigned int index = to_rcar_plane_state(state)->hwindex;
 382
 383                 prio -= 4;
 384                 dspr |= (index + 1) << prio;
 385                 hwplanes |= 1 << index;
 386
 387                 if (plane_format(plane)->planes == 2) {
 388                         index = (index + 1) % 8;
 389
 390                         prio -= 4;
 391                         dspr |= (index + 1) << prio;
 392                         hwplanes |= 1 << index;
 393                 }
 394         }
 395
 396         /* If VSP+DU integration is enabled the plane assignment is fixed. */
 397         if (rcar_du_has(rcdu, RCAR_DU_FEATURE_VSP1_SOURCE)) {
 398                 if (rcdu->info->gen < 3) {
 399                         dspr = (rcrtc->index % 2) + 1;
 400                         hwplanes = 1 << (rcrtc->index % 2);
 401                 } else {
 402                         dspr = (rcrtc->index % 2) ? 3 : 1;
 403                         hwplanes = 1 << ((rcrtc->index % 2) ? 2 : 0);
 404                 }
 405         }
 406
 407         /*
 408          * Update the planes to display timing and dot clock generator
 409          * associations.
 410          *
 411          * Updating the DPTSR register requires restarting the CRTC group,
 412          * resulting in visible flicker. To mitigate the issue only update the
 413          * association if needed by enabled planes. Planes being disabled will
 414          * keep their current association.
 415          */
 416         mutex_lock(&rcrtc->group->lock);
 417
 418         dptsr_planes = rcrtc->index % 2 ? rcrtc->group->dptsr_planes | hwplanes
 419                      : rcrtc->group->dptsr_planes & ~hwplanes;
 420
 421         if (dptsr_planes != rcrtc->group->dptsr_planes) {
 422                 rcar_du_group_write(rcrtc->group, DPTSR,
 423                                     (dptsr_planes << 16) | dptsr_planes);
 424                 rcrtc->group->dptsr_planes = dptsr_planes;
 425
 426                 if (rcrtc->group->used_crtcs)
 427                         rcar_du_group_restart(rcrtc->group);
 428         }
 429
 430         /* Restart the group if plane sources have changed. */
 431         if (rcrtc->group->need_restart)
 432                 rcar_du_group_restart(rcrtc->group);
 433
 434         mutex_unlock(&rcrtc->group->lock);
 435
 436         rcar_du_group_write(rcrtc->group, rcrtc->index % 2 ? DS2PR : DS1PR,
 437                             dspr);
 438 }
 439
 440 /* -----------------------------------------------------------------------------
 441  * Page Flip
 442  */
 443
 444 void rcar_du_crtc_finish_page_flip(struct rcar_du_crtc *rcrtc)
 445 {
 446         struct drm_pending_vblank_event *event;
 447         struct drm_device *dev = rcrtc->crtc.dev;
 448         unsigned long flags;
 449
 450         spin_lock_irqsave(&dev->event_lock, flags);
 451         event = rcrtc->event;
 452         rcrtc->event = NULL;
 453         spin_unlock_irqrestore(&dev->event_lock, flags);
 454
 455         if (event == NULL)
 456                 return;
 457
 458         spin_lock_irqsave(&dev->event_lock, flags);
 459         drm_crtc_send_vblank_event(&rcrtc->crtc, event);
 460         wake_up(&rcrtc->flip_wait);
 461         spin_unlock_irqrestore(&dev->event_lock, flags);
 462
 463         drm_crtc_vblank_put(&rcrtc->crtc);
 464 }
 465
 466 static bool rcar_du_crtc_page_flip_pending(struct rcar_du_crtc *rcrtc)
 467 {
 468         struct drm_device *dev = rcrtc->crtc.dev;
 469         unsigned long flags;
 470         bool pending;
 471
 472         spin_lock_irqsave(&dev->event_lock, flags);
 473         pending = rcrtc->event != NULL;
 474         spin_unlock_irqrestore(&dev->event_lock, flags);
 475
 476         return pending;
 477 }
 478
 479 static void rcar_du_crtc_wait_page_flip(struct rcar_du_crtc *rcrtc)
 480 {
 481         struct rcar_du_device *rcdu = rcrtc->group->dev;
 482
 483         if (wait_event_timeout(rcrtc->flip_wait,
 484                                !rcar_du_crtc_page_flip_pending(rcrtc),
 485                                msecs_to_jiffies(50)))
 486                 return;
 487
 488         dev_warn(rcdu->dev, "page flip timeout\n");
 489
 490         rcar_du_crtc_finish_page_flip(rcrtc);
 491 }
 492
 493 /* -----------------------------------------------------------------------------
 494  * Start/Stop and Suspend/Resume
 495  */
 496
 497 static void rcar_du_crtc_setup(struct rcar_du_crtc *rcrtc)
 498 {
 499         /* Set display off and background to black */
 500         rcar_du_crtc_write(rcrtc, DOOR, DOOR_RGB(0, 0, 0));
 501         rcar_du_crtc_write(rcrtc, BPOR, BPOR_RGB(0, 0, 0));
 502
 503         /* Configure display timings and output routing */
 504         rcar_du_crtc_set_display_timing(rcrtc);
 505         rcar_du_group_set_routing(rcrtc->group);
 506
 507         /* Start with all planes disabled. */
 508         rcar_du_group_write(rcrtc->group, rcrtc->index % 2 ? DS2PR : DS1PR, 0);
 509
 510         /* Enable the VSP compositor. */
 511         if (rcar_du_has(rcrtc->group->dev, RCAR_DU_FEATURE_VSP1_SOURCE))
 512                 rcar_du_vsp_enable(rcrtc);
 513
 514         /* Turn vertical blanking interrupt reporting on. */
 515         drm_crtc_vblank_on(&rcrtc->crtc);
 516 }
 517
 518 static void rcar_du_crtc_start(struct rcar_du_crtc *rcrtc)
 519 {
 520         bool interlaced;
 521
 522         /*
 523          * Select master sync mode. This enables display operation in master
 524          * sync mode (with the HSYNC and VSYNC signals configured as outputs and
 525          * actively driven).
 526          */
 527         interlaced = rcrtc->crtc.mode.flags & DRM_MODE_FLAG_INTERLACE;
 528         rcar_du_crtc_clr_set(rcrtc, DSYSR, DSYSR_TVM_MASK | DSYSR_SCM_MASK,
 529                              (interlaced ? DSYSR_SCM_INT_VIDEO : 0) |
 530                              DSYSR_TVM_MASTER);
 531
 532         rcar_du_group_start_stop(rcrtc->group, true);
 533 }
 534
 535 static void rcar_du_crtc_disable_planes(struct rcar_du_crtc *rcrtc)
 536 {
 537         struct rcar_du_device *rcdu = rcrtc->group->dev;
 538         struct drm_crtc *crtc = &rcrtc->crtc;
 539         u32 status;
 540
 541         /* Make sure vblank interrupts are enabled. */
 542         drm_crtc_vblank_get(crtc);
 543
 544         /*
 545          * Disable planes and calculate how many vertical blanking interrupts we
 546          * have to wait for. If a vertical blanking interrupt has been triggered
 547          * but not processed yet, we don't know whether it occurred before or
 548          * after the planes got disabled. We thus have to wait for two vblank
 549          * interrupts in that case.
 550          */
 551         spin_lock_irq(&rcrtc->vblank_lock);
 552         rcar_du_group_write(rcrtc->group, rcrtc->index % 2 ? DS2PR : DS1PR, 0);
 553         status = rcar_du_crtc_read(rcrtc, DSSR);
 554         rcrtc->vblank_count = status & DSSR_VBK ? 2 : 1;
 555         spin_unlock_irq(&rcrtc->vblank_lock);
 556
 557         if (!wait_event_timeout(rcrtc->vblank_wait, rcrtc->vblank_count == 0,
 558                                 msecs_to_jiffies(100)))
 559                 dev_warn(rcdu->dev, "vertical blanking timeout\n");
 560
 561         drm_crtc_vblank_put(crtc);
 562 }
 563
 564 static void rcar_du_crtc_stop(struct rcar_du_crtc *rcrtc)
 565 {
 566         struct drm_crtc *crtc = &rcrtc->crtc;
 567
 568         /*
 569          * Disable all planes and wait for the change to take effect. This is
 570          * required as the plane enable registers are updated on vblank, and no
 571          * vblank will occur once the CRTC is stopped. Disabling planes when
 572          * starting the CRTC thus wouldn't be enough as it would start scanning
 573          * out immediately from old frame buffers until the next vblank.
 574          *
 575          * This increases the CRTC stop delay, especially when multiple CRTCs
 576          * are stopped in one operation as we now wait for one vblank per CRTC.
 577          * Whether this can be improved needs to be researched.
 578          */
 579         rcar_du_crtc_disable_planes(rcrtc);
 580
 581         /*
 582          * Disable vertical blanking interrupt reporting. We first need to wait
 583          * for page flip completion before stopping the CRTC as userspace
 584          * expects page flips to eventually complete.
 585          */
 586         rcar_du_crtc_wait_page_flip(rcrtc);
 587         drm_crtc_vblank_off(crtc);
 588
 589         /* Disable the VSP compositor. */
 590         if (rcar_du_has(rcrtc->group->dev, RCAR_DU_FEATURE_VSP1_SOURCE))
 591                 rcar_du_vsp_disable(rcrtc);
 592
 593         /*
 594          * Select switch sync mode. This stops display operation and configures
 595          * the HSYNC and VSYNC signals as inputs.
 596          */
 597         rcar_du_crtc_clr_set(rcrtc, DSYSR, DSYSR_TVM_MASK, DSYSR_TVM_SWITCH);
 598
 599         rcar_du_group_start_stop(rcrtc->group, false);
 600 }
 601
 602 /* -----------------------------------------------------------------------------
 603  * CRTC Functions
 604  */
 605
 606 static void rcar_du_crtc_atomic_enable(struct drm_crtc *crtc,
 607                                        struct drm_crtc_state *old_state)
 608 {
 609         struct rcar_du_crtc *rcrtc = to_rcar_crtc(crtc);
 610
 611         /*
 612          * If the CRTC has already been setup by the .atomic_begin() handler we
 613          * can skip the setup stage.
 614          */
 615         if (!rcrtc->initialized) {
 616                 rcar_du_crtc_get(rcrtc);
 617                 rcar_du_crtc_setup(rcrtc);
 618                 rcrtc->initialized = true;
 619         }
 620
 621         rcar_du_crtc_start(rcrtc);
 622 }
 623
 624 static void rcar_du_crtc_atomic_disable(struct drm_crtc *crtc,
 625                                         struct drm_crtc_state *old_state)
 626 {
 627         struct rcar_du_crtc *rcrtc = to_rcar_crtc(crtc);
 628
 629         rcar_du_crtc_stop(rcrtc);
 630         rcar_du_crtc_put(rcrtc);
 631
 632         spin_lock_irq(&crtc->dev->event_lock);
 633         if (crtc->state->event) {
 634                 drm_crtc_send_vblank_event(crtc, crtc->state->event);
 635                 crtc->state->event = NULL;
 636         }
 637         spin_unlock_irq(&crtc->dev->event_lock);
 638
 639         rcrtc->initialized = false;
 640         rcrtc->outputs = 0;
 641 }
 642
 643 static void rcar_du_crtc_atomic_begin(struct drm_crtc *crtc,
 644                                       struct drm_crtc_state *old_crtc_state)
 645 {
 646         struct rcar_du_crtc *rcrtc = to_rcar_crtc(crtc);
 647
 648         WARN_ON(!crtc->state->enable);
 649
 650         /*
 651          * If a mode set is in progress we can be called with the CRTC disabled.
 652          * We then need to first setup the CRTC in order to configure planes.
 653          * The .atomic_enable() handler will notice and skip the CRTC setup.
 654          */
 655         if (!rcrtc->initialized) {
 656                 rcar_du_crtc_get(rcrtc);
 657                 rcar_du_crtc_setup(rcrtc);
 658                 rcrtc->initialized = true;
 659         }
 660
 661         if (rcar_du_has(rcrtc->group->dev, RCAR_DU_FEATURE_VSP1_SOURCE))
 662                 rcar_du_vsp_atomic_begin(rcrtc);
 663 }
 664
 665 static void rcar_du_crtc_atomic_flush(struct drm_crtc *crtc,
 666                                       struct drm_crtc_state *old_crtc_state)
 667 {
 668         struct rcar_du_crtc *rcrtc = to_rcar_crtc(crtc);
 669         struct drm_device *dev = rcrtc->crtc.dev;
 670         unsigned long flags;
 671
 672         rcar_du_crtc_update_planes(rcrtc);
 673
 674         if (crtc->state->event) {
 675                 WARN_ON(drm_crtc_vblank_get(crtc) != 0);
 676
 677                 spin_lock_irqsave(&dev->event_lock, flags);
 678                 rcrtc->event = crtc->state->event;
 679                 crtc->state->event = NULL;
 680                 spin_unlock_irqrestore(&dev->event_lock, flags);
 681         }
 682
 683         if (rcar_du_has(rcrtc->group->dev, RCAR_DU_FEATURE_VSP1_SOURCE))
 684                 rcar_du_vsp_atomic_flush(rcrtc);
 685 }
 686
 687 static const struct drm_crtc_helper_funcs crtc_helper_funcs = {
 688         .atomic_begin = rcar_du_crtc_atomic_begin,
 689         .atomic_flush = rcar_du_crtc_atomic_flush,
 690         .atomic_enable = rcar_du_crtc_atomic_enable,
 691         .atomic_disable = rcar_du_crtc_atomic_disable,
 692 };
 693
 694 static struct drm_crtc_state *
 695 rcar_du_crtc_atomic_duplicate_state(struct drm_crtc *crtc)
 696 {
 697         struct rcar_du_crtc_state *state;
 698         struct rcar_du_crtc_state *copy;
 699
 700         if (WARN_ON(!crtc->state))
 701                 return NULL;
 702
 703         state = to_rcar_crtc_state(crtc->state);
 704         copy = kmemdup(state, sizeof(*state), GFP_KERNEL);
 705         if (copy == NULL)
 706                 return NULL;
 707
 708         __drm_atomic_helper_crtc_duplicate_state(crtc, &copy->state);
 709
 710         return &copy->state;
 711 }
 712
 713 static void rcar_du_crtc_atomic_destroy_state(struct drm_crtc *crtc,
 714                                               struct drm_crtc_state *state)
 715 {
 716         __drm_atomic_helper_crtc_destroy_state(state);
 717         kfree(to_rcar_crtc_state(state));
 718 }
 719
 720 static void rcar_du_crtc_reset(struct drm_crtc *crtc)
 721 {
 722         struct rcar_du_crtc_state *state;
 723
 724         if (crtc->state) {
 725                 rcar_du_crtc_atomic_destroy_state(crtc, crtc->state);
 726                 crtc->state = NULL;
 727         }
 728
 729         state = kzalloc(sizeof(*state), GFP_KERNEL);
 730         if (state == NULL)
 731                 return;
 732
 733         state->crc.source = VSP1_DU_CRC_NONE;
 734         state->crc.index = 0;
 735
 736         crtc->state = &state->state;
 737         crtc->state->crtc = crtc;
 738 }
 739
 740 static int rcar_du_crtc_enable_vblank(struct drm_crtc *crtc)
 741 {
 742         struct rcar_du_crtc *rcrtc = to_rcar_crtc(crtc);
 743
 744         rcar_du_crtc_write(rcrtc, DSRCR, DSRCR_VBCL);
 745         rcar_du_crtc_set(rcrtc, DIER, DIER_VBE);
 746         rcrtc->vblank_enable = true;
 747
 748         return 0;
 749 }
 750
 751 static void rcar_du_crtc_disable_vblank(struct drm_crtc *crtc)
 752 {
 753         struct rcar_du_crtc *rcrtc = to_rcar_crtc(crtc);
 754
 755         rcar_du_crtc_clr(rcrtc, DIER, DIER_VBE);
 756         rcrtc->vblank_enable = false;
 757 }
 758
 759 static int rcar_du_crtc_set_crc_source(struct drm_crtc *crtc,
 760                                        const char *source_name,
 761                                        size_t *values_cnt)
 762 {
 763         struct rcar_du_crtc *rcrtc = to_rcar_crtc(crtc);
 764         struct drm_modeset_acquire_ctx ctx;
 765         struct drm_crtc_state *crtc_state;
 766         struct drm_atomic_state *state;
 767         enum vsp1_du_crc_source source;
 768         unsigned int index = 0;
 769         unsigned int i;
 770         int ret;
 771
 772         /*
 773          * Parse the source name. Supported values are "plane%u" to compute the
 774          * CRC on an input plane (%u is the plane ID), and "auto" to compute the
 775          * CRC on the composer (VSP) output.
 776          */
 777         if (!source_name) {
 778                 source = VSP1_DU_CRC_NONE;
 779         } else if (!strcmp(source_name, "auto")) {
 780                 source = VSP1_DU_CRC_OUTPUT;
 781         } else if (strstarts(source_name, "plane")) {
 782                 source = VSP1_DU_CRC_PLANE;
 783
 784                 ret = kstrtouint(source_name + strlen("plane"), 10, &index);
 785                 if (ret < 0)
 786                         return ret;
 787
 788                 for (i = 0; i < rcrtc->vsp->num_planes; ++i) {
 789                         if (index == rcrtc->vsp->planes[i].plane.base.id) {
 790                                 index = i;
 791                                 break;
 792                         }
 793                 }
 794
 795                 if (i >= rcrtc->vsp->num_planes)
 796                         return -EINVAL;
 797         } else {
 798                 return -EINVAL;
 799         }
 800
 801         *values_cnt = 1;
 802
 803         /* Perform an atomic commit to set the CRC source. */
 804         drm_modeset_acquire_init(&ctx, 0);
 805
 806         state = drm_atomic_state_alloc(crtc->dev);
 807         if (!state) {
 808                 ret = -ENOMEM;
 809                 goto unlock;
 810         }
 811
 812         state->acquire_ctx = &ctx;
 813
 814 retry:
 815         crtc_state = drm_atomic_get_crtc_state(state, crtc);
 816         if (!IS_ERR(crtc_state)) {
 817                 struct rcar_du_crtc_state *rcrtc_state;
 818
 819                 rcrtc_state = to_rcar_crtc_state(crtc_state);
 820                 rcrtc_state->crc.source = source;
 821                 rcrtc_state->crc.index = index;
 822
 823                 ret = drm_atomic_commit(state);
 824         } else {
 825                 ret = PTR_ERR(crtc_state);
 826         }
 827
 828         if (ret == -EDEADLK) {
 829                 drm_atomic_state_clear(state);
 830                 drm_modeset_backoff(&ctx);
 831                 goto retry;
 832         }
 833
 834         drm_atomic_state_put(state);
 835
 836 unlock:
 837         drm_modeset_drop_locks(&ctx);
 838         drm_modeset_acquire_fini(&ctx);
 839
 840         return ret;
 841 }
 842
 843 static const struct drm_crtc_funcs crtc_funcs_gen2 = {
 844         .reset = rcar_du_crtc_reset,
 845         .destroy = drm_crtc_cleanup,
 846         .set_config = drm_atomic_helper_set_config,
 847         .page_flip = drm_atomic_helper_page_flip,
 848         .atomic_duplicate_state = rcar_du_crtc_atomic_duplicate_state,
 849         .atomic_destroy_state = rcar_du_crtc_atomic_destroy_state,
 850         .enable_vblank = rcar_du_crtc_enable_vblank,
 851         .disable_vblank = rcar_du_crtc_disable_vblank,
 852 };
 853
 854 static const struct drm_crtc_funcs crtc_funcs_gen3 = {
 855         .reset = rcar_du_crtc_reset,
 856         .destroy = drm_crtc_cleanup,
 857         .set_config = drm_atomic_helper_set_config,
 858         .page_flip = drm_atomic_helper_page_flip,
 859         .atomic_duplicate_state = rcar_du_crtc_atomic_duplicate_state,
 860         .atomic_destroy_state = rcar_du_crtc_atomic_destroy_state,
 861         .enable_vblank = rcar_du_crtc_enable_vblank,
 862         .disable_vblank = rcar_du_crtc_disable_vblank,
 863         .set_crc_source = rcar_du_crtc_set_crc_source,
 864 };
 865
 866 /* -----------------------------------------------------------------------------
 867  * Interrupt Handling
 868  */
 869
 870 static irqreturn_t rcar_du_crtc_irq(int irq, void *arg)
 871 {
 872         struct rcar_du_crtc *rcrtc = arg;
 873         struct rcar_du_device *rcdu = rcrtc->group->dev;
 874         irqreturn_t ret = IRQ_NONE;
 875         u32 status;
 876
 877         spin_lock(&rcrtc->vblank_lock);
 878
 879         status = rcar_du_crtc_read(rcrtc, DSSR);
 880         rcar_du_crtc_write(rcrtc, DSRCR, status & DSRCR_MASK);
 881
 882         if (status & DSSR_VBK) {
 883                 /*
 884                  * Wake up the vblank wait if the counter reaches 0. This must
 885                  * be protected by the vblank_lock to avoid races in
 886                  * rcar_du_crtc_disable_planes().
 887                  */
 888                 if (rcrtc->vblank_count) {
 889                         if (--rcrtc->vblank_count == 0)
 890                                 wake_up(&rcrtc->vblank_wait);
 891                 }
 892         }
 893
 894         spin_unlock(&rcrtc->vblank_lock);
 895
 896         if (status & DSSR_VBK) {
 897                 if (rcdu->info->gen < 3) {
 898                         drm_crtc_handle_vblank(&rcrtc->crtc);
 899                         rcar_du_crtc_finish_page_flip(rcrtc);
 900                 }
 901
 902                 ret = IRQ_HANDLED;
 903         }
 904
 905         return ret;
 906 }
 907
 908 /* -----------------------------------------------------------------------------
 909  * Initialization
 910  */
 911
 912 int rcar_du_crtc_create(struct rcar_du_group *rgrp, unsigned int swindex,
 913                         unsigned int hwindex)
 914 {
 915         static const unsigned int mmio_offsets[] = {
 916                 DU0_REG_OFFSET, DU1_REG_OFFSET, DU2_REG_OFFSET, DU3_REG_OFFSET
 917         };
 918
 919         struct rcar_du_device *rcdu = rgrp->dev;
 920         struct platform_device *pdev = to_platform_device(rcdu->dev);
 921         struct rcar_du_crtc *rcrtc = &rcdu->crtcs[swindex];
 922         struct drm_crtc *crtc = &rcrtc->crtc;
 923         struct drm_plane *primary;
 924         unsigned int irqflags;
 925         struct clk *clk;
 926         char clk_name[9];
 927         char *name;
 928         int irq;
 929         int ret;
 930
 931         /* Get the CRTC clock and the optional external clock. */
 932         if (rcar_du_has(rcdu, RCAR_DU_FEATURE_CRTC_IRQ_CLOCK)) {
 933                 sprintf(clk_name, "du.%u", hwindex);
 934                 name = clk_name;
 935         } else {
 936                 name = NULL;
 937         }
 938
 939         rcrtc->clock = devm_clk_get(rcdu->dev, name);
 940         if (IS_ERR(rcrtc->clock)) {
 941                 dev_err(rcdu->dev, "no clock for DU channel %u\n", hwindex);
 942                 return PTR_ERR(rcrtc->clock);
 943         }
 944
 945         sprintf(clk_name, "dclkin.%u", hwindex);
 946         clk = devm_clk_get(rcdu->dev, clk_name);
 947         if (!IS_ERR(clk)) {
 948                 rcrtc->extclock = clk;
 949         } else if (PTR_ERR(rcrtc->clock) == -EPROBE_DEFER) {
 950                 dev_info(rcdu->dev, "can't get external clock %u\n", hwindex);
 951                 return -EPROBE_DEFER;
 952         }
 953
 954         init_waitqueue_head(&rcrtc->flip_wait);
 955         init_waitqueue_head(&rcrtc->vblank_wait);
 956         spin_lock_init(&rcrtc->vblank_lock);
 957
 958         rcrtc->group = rgrp;
 959         rcrtc->mmio_offset = mmio_offsets[hwindex];
 960         rcrtc->index = hwindex;
 961
 962         if (rcar_du_has(rcdu, RCAR_DU_FEATURE_VSP1_SOURCE))
 963                 primary = &rcrtc->vsp->planes[rcrtc->vsp_pipe].plane;
 964         else
 965                 primary = &rgrp->planes[swindex % 2].plane;
 966
 967         ret = drm_crtc_init_with_planes(rcdu->ddev, crtc, primary, NULL,
 968                                         rcdu->info->gen <= 2 ?
 969                                         &crtc_funcs_gen2 : &crtc_funcs_gen3,
 970                                         NULL);
 971         if (ret < 0)
 972                 return ret;
 973
 974         drm_crtc_helper_add(crtc, &crtc_helper_funcs);
 975
 976         /* Start with vertical blanking interrupt reporting disabled. */
 977         drm_crtc_vblank_off(crtc);
 978
 979         /* Register the interrupt handler. */
 980         if (rcar_du_has(rcdu, RCAR_DU_FEATURE_CRTC_IRQ_CLOCK)) {
 981                 /* The IRQ's are associated with the CRTC (sw)index. */
 982                 irq = platform_get_irq(pdev, swindex);
 983                 irqflags = 0;
 984         } else {
 985                 irq = platform_get_irq(pdev, 0);
 986                 irqflags = IRQF_SHARED;
 987         }
 988
 989         if (irq < 0) {
 990                 dev_err(rcdu->dev, "no IRQ for CRTC %u\n", swindex);
 991                 return irq;
 992         }
 993
 994         ret = devm_request_irq(rcdu->dev, irq, rcar_du_crtc_irq, irqflags,
 995                                dev_name(rcdu->dev), rcrtc);
 996         if (ret < 0) {
 997                 dev_err(rcdu->dev,
 998                         "failed to register IRQ for CRTC %u\n", swindex);
 999                 return ret;
1000         }
1001
1002         return 0;
1003 }