drivers/gpu/drm/vc4/vc4_crtc.c

   1 /*
   2  * Copyright (C) 2015 Broadcom
   3  *
   4  * This program is free software; you can redistribute it and/or modify
   5  * it under the terms of the GNU General Public License version 2 as
   6  * published by the Free Software Foundation.
   7  */
   8
   9 /**
  10  * DOC: VC4 CRTC module
  11  *
  12  * In VC4, the Pixel Valve is what most closely corresponds to the
  13  * DRM's concept of a CRTC.  The PV generates video timings from the
  14  * encoder's clock plus its configuration.  It pulls scaled pixels from
  15  * the HVS at that timing, and feeds it to the encoder.
  16  *
  17  * However, the DRM CRTC also collects the configuration of all the
  18  * DRM planes attached to it.  As a result, the CRTC is also
  19  * responsible for writing the display list for the HVS channel that
  20  * the CRTC will use.
  21  *
  22  * The 2835 has 3 different pixel valves.  pv0 in the audio power
  23  * domain feeds DSI0 or DPI, while pv1 feeds DS1 or SMI.  pv2 in the
  24  * image domain can feed either HDMI or the SDTV controller.  The
  25  * pixel valve chooses from the CPRMAN clocks (HSM for HDMI, VEC for
  26  * SDTV, etc.) according to which output type is chosen in the mux.
  27  *
  28  * For power management, the pixel valve's registers are all clocked
  29  * by the AXI clock, while the timings and FIFOs make use of the
  30  * output-specific clock.  Since the encoders also directly consume
  31  * the CPRMAN clocks, and know what timings they need, they are the
  32  * ones that set the clock.
  33  */
  34
  35 #include <drm/drm_atomic.h>
  36 #include <drm/drm_atomic_helper.h>
  37 #include <drm/drm_crtc_helper.h>
  38 #include <linux/clk.h>
  39 #include <drm/drm_fb_cma_helper.h>
  40 #include <linux/component.h>
  41 #include <linux/of_device.h>
  42 #include "vc4_drv.h"
  43 #include "vc4_regs.h"
  44
  45 struct vc4_crtc_state {
  46         struct drm_crtc_state base;
  47         /* Dlist area for this CRTC configuration. */
  48         struct drm_mm_node mm;
  49         bool feed_txp;
  50         bool txp_armed;
  51 };
  52
  53 static inline struct vc4_crtc_state *
  54 to_vc4_crtc_state(struct drm_crtc_state *crtc_state)
  55 {
  56         return (struct vc4_crtc_state *)crtc_state;
  57 }
  58
  59 #define CRTC_WRITE(offset, val) writel(val, vc4_crtc->regs + (offset))
  60 #define CRTC_READ(offset) readl(vc4_crtc->regs + (offset))
  61
  62 #define CRTC_REG(reg) { reg, #reg }
  63 static const struct {
  64         u32 reg;
  65         const char *name;
  66 } crtc_regs[] = {
  67         CRTC_REG(PV_CONTROL),
  68         CRTC_REG(PV_V_CONTROL),
  69         CRTC_REG(PV_VSYNCD_EVEN),
  70         CRTC_REG(PV_HORZA),
  71         CRTC_REG(PV_HORZB),
  72         CRTC_REG(PV_VERTA),
  73         CRTC_REG(PV_VERTB),
  74         CRTC_REG(PV_VERTA_EVEN),
  75         CRTC_REG(PV_VERTB_EVEN),
  76         CRTC_REG(PV_INTEN),
  77         CRTC_REG(PV_INTSTAT),
  78         CRTC_REG(PV_STAT),
  79         CRTC_REG(PV_HACT_ACT),
  80 };
  81
  82 static void vc4_crtc_dump_regs(struct vc4_crtc *vc4_crtc)
  83 {
  84         int i;
  85
  86         for (i = 0; i < ARRAY_SIZE(crtc_regs); i++) {
  87                 DRM_INFO("0x%04x (%s): 0x%08x\n",
  88                          crtc_regs[i].reg, crtc_regs[i].name,
  89                          CRTC_READ(crtc_regs[i].reg));
  90         }
  91 }
  92
  93 #ifdef CONFIG_DEBUG_FS
  94 int vc4_crtc_debugfs_regs(struct seq_file *m, void *unused)
  95 {
  96         struct drm_info_node *node = (struct drm_info_node *)m->private;
  97         struct drm_device *dev = node->minor->dev;
  98         int crtc_index = (uintptr_t)node->info_ent->data;
  99         struct drm_crtc *crtc;
 100         struct vc4_crtc *vc4_crtc;
 101         int i;
 102
 103         i = 0;
 104         list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) {
 105                 if (i == crtc_index)
 106                         break;
 107                 i++;
 108         }
 109         if (!crtc)
 110                 return 0;
 111         vc4_crtc = to_vc4_crtc(crtc);
 112
 113         for (i = 0; i < ARRAY_SIZE(crtc_regs); i++) {
 114                 seq_printf(m, "%s (0x%04x): 0x%08x\n",
 115                            crtc_regs[i].name, crtc_regs[i].reg,
 116                            CRTC_READ(crtc_regs[i].reg));
 117         }
 118
 119         return 0;
 120 }
 121 #endif
 122
 123 bool vc4_crtc_get_scanoutpos(struct drm_device *dev, unsigned int crtc_id,
 124                              bool in_vblank_irq, int *vpos, int *hpos,
 125                              ktime_t *stime, ktime_t *etime,
 126                              const struct drm_display_mode *mode)
 127 {
 128         struct vc4_dev *vc4 = to_vc4_dev(dev);
 129         struct drm_crtc *crtc = drm_crtc_from_index(dev, crtc_id);
 130         struct vc4_crtc *vc4_crtc = to_vc4_crtc(crtc);
 131         u32 val;
 132         int fifo_lines;
 133         int vblank_lines;
 134         bool ret = false;
 135
 136         /* preempt_disable_rt() should go right here in PREEMPT_RT patchset. */
 137
 138         /* Get optional system timestamp before query. */
 139         if (stime)
 140                 *stime = ktime_get();
 141
 142         /*
 143          * Read vertical scanline which is currently composed for our
 144          * pixelvalve by the HVS, and also the scaler status.
 145          */
 146         val = HVS_READ(SCALER_DISPSTATX(vc4_crtc->channel));
 147
 148         /* Get optional system timestamp after query. */
 149         if (etime)
 150                 *etime = ktime_get();
 151
 152         /* preempt_enable_rt() should go right here in PREEMPT_RT patchset. */
 153
 154         /* Vertical position of hvs composed scanline. */
 155         *vpos = VC4_GET_FIELD(val, SCALER_DISPSTATX_LINE);
 156         *hpos = 0;
 157
 158         if (mode->flags & DRM_MODE_FLAG_INTERLACE) {
 159                 *vpos /= 2;
 160
 161                 /* Use hpos to correct for field offset in interlaced mode. */
 162                 if (VC4_GET_FIELD(val, SCALER_DISPSTATX_FRAME_COUNT) % 2)
 163                         *hpos += mode->crtc_htotal / 2;
 164         }
 165
 166         /* This is the offset we need for translating hvs -> pv scanout pos. */
 167         fifo_lines = vc4_crtc->cob_size / mode->crtc_hdisplay;
 168
 169         if (fifo_lines > 0)
 170                 ret = true;
 171
 172         /* HVS more than fifo_lines into frame for compositing? */
 173         if (*vpos > fifo_lines) {
 174                 /*
 175                  * We are in active scanout and can get some meaningful results
 176                  * from HVS. The actual PV scanout can not trail behind more
 177                  * than fifo_lines as that is the fifo's capacity. Assume that
 178                  * in active scanout the HVS and PV work in lockstep wrt. HVS
 179                  * refilling the fifo and PV consuming from the fifo, ie.
 180                  * whenever the PV consumes and frees up a scanline in the
 181                  * fifo, the HVS will immediately refill it, therefore
 182                  * incrementing vpos. Therefore we choose HVS read position -
 183                  * fifo size in scanlines as a estimate of the real scanout
 184                  * position of the PV.
 185                  */
 186                 *vpos -= fifo_lines + 1;
 187
 188                 return ret;
 189         }
 190
 191         /*
 192          * Less: This happens when we are in vblank and the HVS, after getting
 193          * the VSTART restart signal from the PV, just started refilling its
 194          * fifo with new lines from the top-most lines of the new framebuffers.
 195          * The PV does not scan out in vblank, so does not remove lines from
 196          * the fifo, so the fifo will be full quickly and the HVS has to pause.
 197          * We can't get meaningful readings wrt. scanline position of the PV
 198          * and need to make things up in a approximative but consistent way.
 199          */
 200         vblank_lines = mode->vtotal - mode->vdisplay;
 201
 202         if (in_vblank_irq) {
 203                 /*
 204                  * Assume the irq handler got called close to first
 205                  * line of vblank, so PV has about a full vblank
 206                  * scanlines to go, and as a base timestamp use the
 207                  * one taken at entry into vblank irq handler, so it
 208                  * is not affected by random delays due to lock
 209                  * contention on event_lock or vblank_time lock in
 210                  * the core.
 211                  */
 212                 *vpos = -vblank_lines;
 213
 214                 if (stime)
 215                         *stime = vc4_crtc->t_vblank;
 216                 if (etime)
 217                         *etime = vc4_crtc->t_vblank;
 218
 219                 /*
 220                  * If the HVS fifo is not yet full then we know for certain
 221                  * we are at the very beginning of vblank, as the hvs just
 222                  * started refilling, and the stime and etime timestamps
 223                  * truly correspond to start of vblank.
 224                  *
 225                  * Unfortunately there's no way to report this to upper levels
 226                  * and make it more useful.
 227                  */
 228         } else {
 229                 /*
 230                  * No clue where we are inside vblank. Return a vpos of zero,
 231                  * which will cause calling code to just return the etime
 232                  * timestamp uncorrected. At least this is no worse than the
 233                  * standard fallback.
 234                  */
 235                 *vpos = 0;
 236         }
 237
 238         return ret;
 239 }
 240
 241 static void vc4_crtc_destroy(struct drm_crtc *crtc)
 242 {
 243         drm_crtc_cleanup(crtc);
 244 }
 245
 246 static void
 247 vc4_crtc_lut_load(struct drm_crtc *crtc)
 248 {
 249         struct drm_device *dev = crtc->dev;
 250         struct vc4_dev *vc4 = to_vc4_dev(dev);
 251         struct vc4_crtc *vc4_crtc = to_vc4_crtc(crtc);
 252         u32 i;
 253
 254         /* The LUT memory is laid out with each HVS channel in order,
 255          * each of which takes 256 writes for R, 256 for G, then 256
 256          * for B.
 257          */
 258         HVS_WRITE(SCALER_GAMADDR,
 259                   SCALER_GAMADDR_AUTOINC |
 260                   (vc4_crtc->channel * 3 * crtc->gamma_size));
 261
 262         for (i = 0; i < crtc->gamma_size; i++)
 263                 HVS_WRITE(SCALER_GAMDATA, vc4_crtc->lut_r[i]);
 264         for (i = 0; i < crtc->gamma_size; i++)
 265                 HVS_WRITE(SCALER_GAMDATA, vc4_crtc->lut_g[i]);
 266         for (i = 0; i < crtc->gamma_size; i++)
 267                 HVS_WRITE(SCALER_GAMDATA, vc4_crtc->lut_b[i]);
 268 }
 269
 270 static void
 271 vc4_crtc_update_gamma_lut(struct drm_crtc *crtc)
 272 {
 273         struct vc4_crtc *vc4_crtc = to_vc4_crtc(crtc);
 274         struct drm_color_lut *lut = crtc->state->gamma_lut->data;
 275         u32 length = drm_color_lut_size(crtc->state->gamma_lut);
 276         u32 i;
 277
 278         for (i = 0; i < length; i++) {
 279                 vc4_crtc->lut_r[i] = drm_color_lut_extract(lut[i].red, 8);
 280                 vc4_crtc->lut_g[i] = drm_color_lut_extract(lut[i].green, 8);
 281                 vc4_crtc->lut_b[i] = drm_color_lut_extract(lut[i].blue, 8);
 282         }
 283
 284         vc4_crtc_lut_load(crtc);
 285 }
 286
 287 static u32 vc4_get_fifo_full_level(u32 format)
 288 {
 289         static const u32 fifo_len_bytes = 64;
 290         static const u32 hvs_latency_pix = 6;
 291
 292         switch (format) {
 293         case PV_CONTROL_FORMAT_DSIV_16:
 294         case PV_CONTROL_FORMAT_DSIC_16:
 295                 return fifo_len_bytes - 2 * hvs_latency_pix;
 296         case PV_CONTROL_FORMAT_DSIV_18:
 297                 return fifo_len_bytes - 14;
 298         case PV_CONTROL_FORMAT_24:
 299         case PV_CONTROL_FORMAT_DSIV_24:
 300         default:
 301                 return fifo_len_bytes - 3 * hvs_latency_pix;
 302         }
 303 }
 304
 305 /*
 306  * Returns the encoder attached to the CRTC.
 307  *
 308  * VC4 can only scan out to one encoder at a time, while the DRM core
 309  * allows drivers to push pixels to more than one encoder from the
 310  * same CRTC.
 311  */
 312 static struct drm_encoder *vc4_get_crtc_encoder(struct drm_crtc *crtc)
 313 {
 314         struct drm_connector *connector;
 315         struct drm_connector_list_iter conn_iter;
 316
 317         drm_connector_list_iter_begin(crtc->dev, &conn_iter);
 318         drm_for_each_connector_iter(connector, &conn_iter) {
 319                 if (connector->state->crtc == crtc) {
 320                         drm_connector_list_iter_end(&conn_iter);
 321                         return connector->encoder;
 322                 }
 323         }
 324         drm_connector_list_iter_end(&conn_iter);
 325
 326         return NULL;
 327 }
 328
 329 static void vc4_crtc_config_pv(struct drm_crtc *crtc)
 330 {
 331         struct drm_encoder *encoder = vc4_get_crtc_encoder(crtc);
 332         struct vc4_encoder *vc4_encoder = to_vc4_encoder(encoder);
 333         struct vc4_crtc *vc4_crtc = to_vc4_crtc(crtc);
 334         struct drm_crtc_state *state = crtc->state;
 335         struct drm_display_mode *mode = &state->adjusted_mode;
 336         bool interlace = mode->flags & DRM_MODE_FLAG_INTERLACE;
 337         u32 pixel_rep = (mode->flags & DRM_MODE_FLAG_DBLCLK) ? 2 : 1;
 338         bool is_dsi = (vc4_encoder->type == VC4_ENCODER_TYPE_DSI0 ||
 339                        vc4_encoder->type == VC4_ENCODER_TYPE_DSI1);
 340         u32 format = is_dsi ? PV_CONTROL_FORMAT_DSIV_24 : PV_CONTROL_FORMAT_24;
 341
 342         /* Reset the PV fifo. */
 343         CRTC_WRITE(PV_CONTROL, 0);
 344         CRTC_WRITE(PV_CONTROL, PV_CONTROL_FIFO_CLR | PV_CONTROL_EN);
 345         CRTC_WRITE(PV_CONTROL, 0);
 346
 347         CRTC_WRITE(PV_HORZA,
 348                    VC4_SET_FIELD((mode->htotal -
 349                                   mode->hsync_end) * pixel_rep,
 350                                  PV_HORZA_HBP) |
 351                    VC4_SET_FIELD((mode->hsync_end -
 352                                   mode->hsync_start) * pixel_rep,
 353                                  PV_HORZA_HSYNC));
 354         CRTC_WRITE(PV_HORZB,
 355                    VC4_SET_FIELD((mode->hsync_start -
 356                                   mode->hdisplay) * pixel_rep,
 357                                  PV_HORZB_HFP) |
 358                    VC4_SET_FIELD(mode->hdisplay * pixel_rep, PV_HORZB_HACTIVE));
 359
 360         CRTC_WRITE(PV_VERTA,
 361                    VC4_SET_FIELD(mode->crtc_vtotal - mode->crtc_vsync_end,
 362                                  PV_VERTA_VBP) |
 363                    VC4_SET_FIELD(mode->crtc_vsync_end - mode->crtc_vsync_start,
 364                                  PV_VERTA_VSYNC));
 365         CRTC_WRITE(PV_VERTB,
 366                    VC4_SET_FIELD(mode->crtc_vsync_start - mode->crtc_vdisplay,
 367                                  PV_VERTB_VFP) |
 368                    VC4_SET_FIELD(mode->crtc_vdisplay, PV_VERTB_VACTIVE));
 369
 370         if (interlace) {
 371                 CRTC_WRITE(PV_VERTA_EVEN,
 372                            VC4_SET_FIELD(mode->crtc_vtotal -
 373                                          mode->crtc_vsync_end - 1,
 374                                          PV_VERTA_VBP) |
 375                            VC4_SET_FIELD(mode->crtc_vsync_end -
 376                                          mode->crtc_vsync_start,
 377                                          PV_VERTA_VSYNC));
 378                 CRTC_WRITE(PV_VERTB_EVEN,
 379                            VC4_SET_FIELD(mode->crtc_vsync_start -
 380                                          mode->crtc_vdisplay,
 381                                          PV_VERTB_VFP) |
 382                            VC4_SET_FIELD(mode->crtc_vdisplay, PV_VERTB_VACTIVE));
 383
 384                 /* We set up first field even mode for HDMI.  VEC's
 385                  * NTSC mode would want first field odd instead, once
 386                  * we support it (to do so, set ODD_FIRST and put the
 387                  * delay in VSYNCD_EVEN instead).
 388                  */
 389                 CRTC_WRITE(PV_V_CONTROL,
 390                            PV_VCONTROL_CONTINUOUS |
 391                            (is_dsi ? PV_VCONTROL_DSI : 0) |
 392                            PV_VCONTROL_INTERLACE |
 393                            VC4_SET_FIELD(mode->htotal * pixel_rep / 2,
 394                                          PV_VCONTROL_ODD_DELAY));
 395                 CRTC_WRITE(PV_VSYNCD_EVEN, 0);
 396         } else {
 397                 CRTC_WRITE(PV_V_CONTROL,
 398                            PV_VCONTROL_CONTINUOUS |
 399                            (is_dsi ? PV_VCONTROL_DSI : 0));
 400         }
 401
 402         CRTC_WRITE(PV_HACT_ACT, mode->hdisplay * pixel_rep);
 403
 404         CRTC_WRITE(PV_CONTROL,
 405                    VC4_SET_FIELD(format, PV_CONTROL_FORMAT) |
 406                    VC4_SET_FIELD(vc4_get_fifo_full_level(format),
 407                                  PV_CONTROL_FIFO_LEVEL) |
 408                    VC4_SET_FIELD(pixel_rep - 1, PV_CONTROL_PIXEL_REP) |
 409                    PV_CONTROL_CLR_AT_START |
 410                    PV_CONTROL_TRIGGER_UNDERFLOW |
 411                    PV_CONTROL_WAIT_HSTART |
 412                    VC4_SET_FIELD(vc4_encoder->clock_select,
 413                                  PV_CONTROL_CLK_SELECT) |
 414                    PV_CONTROL_FIFO_CLR |
 415                    PV_CONTROL_EN);
 416 }
 417
 418 static void vc4_crtc_mode_set_nofb(struct drm_crtc *crtc)
 419 {
 420         struct drm_device *dev = crtc->dev;
 421         struct vc4_dev *vc4 = to_vc4_dev(dev);
 422         struct vc4_crtc *vc4_crtc = to_vc4_crtc(crtc);
 423         struct vc4_crtc_state *vc4_state = to_vc4_crtc_state(crtc->state);
 424         struct drm_display_mode *mode = &crtc->state->adjusted_mode;
 425         bool interlace = mode->flags & DRM_MODE_FLAG_INTERLACE;
 426         bool debug_dump_regs = false;
 427
 428         if (debug_dump_regs) {
 429                 DRM_INFO("CRTC %d regs before:\n", drm_crtc_index(crtc));
 430                 vc4_crtc_dump_regs(vc4_crtc);
 431         }
 432
 433         if (vc4_crtc->channel == 2) {
 434                 u32 dispctrl;
 435                 u32 dsp3_mux;
 436
 437                 /*
 438                  * SCALER_DISPCTRL_DSP3 = X, where X < 2 means 'connect DSP3 to
 439                  * FIFO X'.
 440                  * SCALER_DISPCTRL_DSP3 = 3 means 'disable DSP 3'.
 441                  *
 442                  * DSP3 is connected to FIFO2 unless the transposer is
 443                  * enabled. In this case, FIFO 2 is directly accessed by the
 444                  * TXP IP, and we need to disable the FIFO2 -> pixelvalve1
 445                  * route.
 446                  */
 447                 if (vc4_state->feed_txp)
 448                         dsp3_mux = VC4_SET_FIELD(3, SCALER_DISPCTRL_DSP3_MUX);
 449                 else
 450                         dsp3_mux = VC4_SET_FIELD(2, SCALER_DISPCTRL_DSP3_MUX);
 451
 452                 dispctrl = HVS_READ(SCALER_DISPCTRL) &
 453                            ~SCALER_DISPCTRL_DSP3_MUX_MASK;
 454                 HVS_WRITE(SCALER_DISPCTRL, dispctrl | dsp3_mux);
 455         }
 456
 457         if (!vc4_state->feed_txp)
 458                 vc4_crtc_config_pv(crtc);
 459
 460         HVS_WRITE(SCALER_DISPBKGNDX(vc4_crtc->channel),
 461                   SCALER_DISPBKGND_AUTOHS |
 462                   SCALER_DISPBKGND_GAMMA |
 463                   (interlace ? SCALER_DISPBKGND_INTERLACE : 0));
 464
 465         /* Reload the LUT, since the SRAMs would have been disabled if
 466          * all CRTCs had SCALER_DISPBKGND_GAMMA unset at once.
 467          */
 468         vc4_crtc_lut_load(crtc);
 469
 470         if (debug_dump_regs) {
 471                 DRM_INFO("CRTC %d regs after:\n", drm_crtc_index(crtc));
 472                 vc4_crtc_dump_regs(vc4_crtc);
 473         }
 474 }
 475
 476 static void require_hvs_enabled(struct drm_device *dev)
 477 {
 478         struct vc4_dev *vc4 = to_vc4_dev(dev);
 479
 480         WARN_ON_ONCE((HVS_READ(SCALER_DISPCTRL) & SCALER_DISPCTRL_ENABLE) !=
 481                      SCALER_DISPCTRL_ENABLE);
 482 }
 483
 484 static void vc4_crtc_atomic_disable(struct drm_crtc *crtc,
 485                                     struct drm_crtc_state *old_state)
 486 {
 487         struct drm_device *dev = crtc->dev;
 488         struct vc4_dev *vc4 = to_vc4_dev(dev);
 489         struct vc4_crtc *vc4_crtc = to_vc4_crtc(crtc);
 490         u32 chan = vc4_crtc->channel;
 491         int ret;
 492         require_hvs_enabled(dev);
 493
 494         /* Disable vblank irq handling before crtc is disabled. */
 495         drm_crtc_vblank_off(crtc);
 496
 497         CRTC_WRITE(PV_V_CONTROL,
 498                    CRTC_READ(PV_V_CONTROL) & ~PV_VCONTROL_VIDEN);
 499         ret = wait_for(!(CRTC_READ(PV_V_CONTROL) & PV_VCONTROL_VIDEN), 1);
 500         WARN_ONCE(ret, "Timeout waiting for !PV_VCONTROL_VIDEN\n");
 501
 502         if (HVS_READ(SCALER_DISPCTRLX(chan)) &
 503             SCALER_DISPCTRLX_ENABLE) {
 504                 HVS_WRITE(SCALER_DISPCTRLX(chan),
 505                           SCALER_DISPCTRLX_RESET);
 506
 507                 /* While the docs say that reset is self-clearing, it
 508                  * seems it doesn't actually.
 509                  */
 510                 HVS_WRITE(SCALER_DISPCTRLX(chan), 0);
 511         }
 512
 513         /* Once we leave, the scaler should be disabled and its fifo empty. */
 514
 515         WARN_ON_ONCE(HVS_READ(SCALER_DISPCTRLX(chan)) & SCALER_DISPCTRLX_RESET);
 516
 517         WARN_ON_ONCE(VC4_GET_FIELD(HVS_READ(SCALER_DISPSTATX(chan)),
 518                                    SCALER_DISPSTATX_MODE) !=
 519                      SCALER_DISPSTATX_MODE_DISABLED);
 520
 521         WARN_ON_ONCE((HVS_READ(SCALER_DISPSTATX(chan)) &
 522                       (SCALER_DISPSTATX_FULL | SCALER_DISPSTATX_EMPTY)) !=
 523                      SCALER_DISPSTATX_EMPTY);
 524
 525         /*
 526          * Make sure we issue a vblank event after disabling the CRTC if
 527          * someone was waiting it.
 528          */
 529         if (crtc->state->event) {
 530                 unsigned long flags;
 531
 532                 spin_lock_irqsave(&dev->event_lock, flags);
 533                 drm_crtc_send_vblank_event(crtc, crtc->state->event);
 534                 crtc->state->event = NULL;
 535                 spin_unlock_irqrestore(&dev->event_lock, flags);
 536         }
 537 }
 538
 539 void vc4_crtc_txp_armed(struct drm_crtc_state *state)
 540 {
 541         struct vc4_crtc_state *vc4_state = to_vc4_crtc_state(state);
 542
 543         vc4_state->txp_armed = true;
 544 }
 545
 546 static void vc4_crtc_update_dlist(struct drm_crtc *crtc)
 547 {
 548         struct drm_device *dev = crtc->dev;
 549         struct vc4_dev *vc4 = to_vc4_dev(dev);
 550         struct vc4_crtc *vc4_crtc = to_vc4_crtc(crtc);
 551         struct vc4_crtc_state *vc4_state = to_vc4_crtc_state(crtc->state);
 552
 553         if (crtc->state->event) {
 554                 unsigned long flags;
 555
 556                 crtc->state->event->pipe = drm_crtc_index(crtc);
 557
 558                 WARN_ON(drm_crtc_vblank_get(crtc) != 0);
 559
 560                 spin_lock_irqsave(&dev->event_lock, flags);
 561
 562                 if (!vc4_state->feed_txp || vc4_state->txp_armed) {
 563                         vc4_crtc->event = crtc->state->event;
 564                         crtc->state->event = NULL;
 565                 }
 566
 567                 HVS_WRITE(SCALER_DISPLISTX(vc4_crtc->channel),
 568                           vc4_state->mm.start);
 569
 570                 spin_unlock_irqrestore(&dev->event_lock, flags);
 571         } else {
 572                 HVS_WRITE(SCALER_DISPLISTX(vc4_crtc->channel),
 573                           vc4_state->mm.start);
 574         }
 575 }
 576
 577 static void vc4_crtc_atomic_enable(struct drm_crtc *crtc,
 578                                    struct drm_crtc_state *old_state)
 579 {
 580         struct drm_device *dev = crtc->dev;
 581         struct vc4_dev *vc4 = to_vc4_dev(dev);
 582         struct vc4_crtc *vc4_crtc = to_vc4_crtc(crtc);
 583         struct vc4_crtc_state *vc4_state = to_vc4_crtc_state(crtc->state);
 584         struct drm_display_mode *mode = &crtc->state->adjusted_mode;
 585
 586         require_hvs_enabled(dev);
 587
 588         /* Enable vblank irq handling before crtc is started otherwise
 589          * drm_crtc_get_vblank() fails in vc4_crtc_update_dlist().
 590          */
 591         drm_crtc_vblank_on(crtc);
 592         vc4_crtc_update_dlist(crtc);
 593
 594         /* Turn on the scaler, which will wait for vstart to start
 595          * compositing.
 596          * When feeding the transposer, we should operate in oneshot
 597          * mode.
 598          */
 599         HVS_WRITE(SCALER_DISPCTRLX(vc4_crtc->channel),
 600                   VC4_SET_FIELD(mode->hdisplay, SCALER_DISPCTRLX_WIDTH) |
 601                   VC4_SET_FIELD(mode->vdisplay, SCALER_DISPCTRLX_HEIGHT) |
 602                   SCALER_DISPCTRLX_ENABLE |
 603                   (vc4_state->feed_txp ? SCALER_DISPCTRLX_ONESHOT : 0));
 604
 605         /* When feeding the transposer block the pixelvalve is unneeded and
 606          * should not be enabled.
 607          */
 608         if (!vc4_state->feed_txp)
 609                 CRTC_WRITE(PV_V_CONTROL,
 610                            CRTC_READ(PV_V_CONTROL) | PV_VCONTROL_VIDEN);
 611 }
 612
 613 static enum drm_mode_status vc4_crtc_mode_valid(struct drm_crtc *crtc,
 614                                                 const struct drm_display_mode *mode)
 615 {
 616         /* Do not allow doublescan modes from user space */
 617         if (mode->flags & DRM_MODE_FLAG_DBLSCAN) {
 618                 DRM_DEBUG_KMS("[CRTC:%d] Doublescan mode rejected.\n",
 619                               crtc->base.id);
 620                 return MODE_NO_DBLESCAN;
 621         }
 622
 623         return MODE_OK;
 624 }
 625
 626 static int vc4_crtc_atomic_check(struct drm_crtc *crtc,
 627                                  struct drm_crtc_state *state)
 628 {
 629         struct vc4_crtc_state *vc4_state = to_vc4_crtc_state(state);
 630         struct drm_device *dev = crtc->dev;
 631         struct vc4_dev *vc4 = to_vc4_dev(dev);
 632         struct drm_plane *plane;
 633         unsigned long flags;
 634         const struct drm_plane_state *plane_state;
 635         struct drm_connector *conn;
 636         struct drm_connector_state *conn_state;
 637         u32 dlist_count = 0;
 638         int ret, i;
 639
 640         /* The pixelvalve can only feed one encoder (and encoders are
 641          * 1:1 with connectors.)
 642          */
 643         if (hweight32(state->connector_mask) > 1)
 644                 return -EINVAL;
 645
 646         drm_atomic_crtc_state_for_each_plane_state(plane, plane_state, state)
 647                 dlist_count += vc4_plane_dlist_size(plane_state);
 648
 649         dlist_count++; /* Account for SCALER_CTL0_END. */
 650
 651         spin_lock_irqsave(&vc4->hvs->mm_lock, flags);
 652         ret = drm_mm_insert_node(&vc4->hvs->dlist_mm, &vc4_state->mm,
 653                                  dlist_count);
 654         spin_unlock_irqrestore(&vc4->hvs->mm_lock, flags);
 655         if (ret)
 656                 return ret;
 657
 658         for_each_new_connector_in_state(state->state, conn, conn_state, i) {
 659                 if (conn_state->crtc != crtc)
 660                         continue;
 661
 662                 /* The writeback connector is implemented using the transposer
 663                  * block which is directly taking its data from the HVS FIFO.
 664                  */
 665                 if (conn->connector_type == DRM_MODE_CONNECTOR_WRITEBACK) {
 666                         state->no_vblank = true;
 667                         vc4_state->feed_txp = true;
 668                 } else {
 669                         state->no_vblank = false;
 670                         vc4_state->feed_txp = false;
 671                 }
 672
 673                 break;
 674         }
 675
 676         return 0;
 677 }
 678
 679 static void vc4_crtc_atomic_flush(struct drm_crtc *crtc,
 680                                   struct drm_crtc_state *old_state)
 681 {
 682         struct drm_device *dev = crtc->dev;
 683         struct vc4_dev *vc4 = to_vc4_dev(dev);
 684         struct vc4_crtc *vc4_crtc = to_vc4_crtc(crtc);
 685         struct vc4_crtc_state *vc4_state = to_vc4_crtc_state(crtc->state);
 686         struct drm_plane *plane;
 687         struct vc4_plane_state *vc4_plane_state;
 688         bool debug_dump_regs = false;
 689         bool enable_bg_fill = false;
 690         u32 __iomem *dlist_start = vc4->hvs->dlist + vc4_state->mm.start;
 691         u32 __iomem *dlist_next = dlist_start;
 692
 693         if (debug_dump_regs) {
 694                 DRM_INFO("CRTC %d HVS before:\n", drm_crtc_index(crtc));
 695                 vc4_hvs_dump_state(dev);
 696         }
 697
 698         /* Copy all the active planes' dlist contents to the hardware dlist. */
 699         drm_atomic_crtc_for_each_plane(plane, crtc) {
 700                 /* Is this the first active plane? */
 701                 if (dlist_next == dlist_start) {
 702                         /* We need to enable background fill when a plane
 703                          * could be alpha blending from the background, i.e.
 704                          * where no other plane is underneath. It suffices to
 705                          * consider the first active plane here since we set
 706                          * needs_bg_fill such that either the first plane
 707                          * already needs it or all planes on top blend from
 708                          * the first or a lower plane.
 709                          */
 710                         vc4_plane_state = to_vc4_plane_state(plane->state);
 711                         enable_bg_fill = vc4_plane_state->needs_bg_fill;
 712                 }
 713
 714                 dlist_next += vc4_plane_write_dlist(plane, dlist_next);
 715         }
 716
 717         writel(SCALER_CTL0_END, dlist_next);
 718         dlist_next++;
 719
 720         WARN_ON_ONCE(dlist_next - dlist_start != vc4_state->mm.size);
 721
 722         if (enable_bg_fill)
 723                 /* This sets a black background color fill, as is the case
 724                  * with other DRM drivers.
 725                  */
 726                 HVS_WRITE(SCALER_DISPBKGNDX(vc4_crtc->channel),
 727                           HVS_READ(SCALER_DISPBKGNDX(vc4_crtc->channel)) |
 728                           SCALER_DISPBKGND_FILL);
 729
 730         /* Only update DISPLIST if the CRTC was already running and is not
 731          * being disabled.
 732          * vc4_crtc_enable() takes care of updating the dlist just after
 733          * re-enabling VBLANK interrupts and before enabling the engine.
 734          * If the CRTC is being disabled, there's no point in updating this
 735          * information.
 736          */
 737         if (crtc->state->active && old_state->active)
 738                 vc4_crtc_update_dlist(crtc);
 739
 740         if (crtc->state->color_mgmt_changed) {
 741                 u32 dispbkgndx = HVS_READ(SCALER_DISPBKGNDX(vc4_crtc->channel));
 742
 743                 if (crtc->state->gamma_lut) {
 744                         vc4_crtc_update_gamma_lut(crtc);
 745                         dispbkgndx |= SCALER_DISPBKGND_GAMMA;
 746                 } else {
 747                         /* Unsetting DISPBKGND_GAMMA skips the gamma lut step
 748                          * in hardware, which is the same as a linear lut that
 749                          * DRM expects us to use in absence of a user lut.
 750                          */
 751                         dispbkgndx &= ~SCALER_DISPBKGND_GAMMA;
 752                 }
 753                 HVS_WRITE(SCALER_DISPBKGNDX(vc4_crtc->channel), dispbkgndx);
 754         }
 755
 756         if (debug_dump_regs) {
 757                 DRM_INFO("CRTC %d HVS after:\n", drm_crtc_index(crtc));
 758                 vc4_hvs_dump_state(dev);
 759         }
 760 }
 761
 762 static int vc4_enable_vblank(struct drm_crtc *crtc)
 763 {
 764         struct vc4_crtc *vc4_crtc = to_vc4_crtc(crtc);
 765
 766         CRTC_WRITE(PV_INTEN, PV_INT_VFP_START);
 767
 768         return 0;
 769 }
 770
 771 static void vc4_disable_vblank(struct drm_crtc *crtc)
 772 {
 773         struct vc4_crtc *vc4_crtc = to_vc4_crtc(crtc);
 774
 775         CRTC_WRITE(PV_INTEN, 0);
 776 }
 777
 778 static void vc4_crtc_handle_page_flip(struct vc4_crtc *vc4_crtc)
 779 {
 780         struct drm_crtc *crtc = &vc4_crtc->base;
 781         struct drm_device *dev = crtc->dev;
 782         struct vc4_dev *vc4 = to_vc4_dev(dev);
 783         struct vc4_crtc_state *vc4_state = to_vc4_crtc_state(crtc->state);
 784         u32 chan = vc4_crtc->channel;
 785         unsigned long flags;
 786
 787         spin_lock_irqsave(&dev->event_lock, flags);
 788         if (vc4_crtc->event &&
 789             (vc4_state->mm.start == HVS_READ(SCALER_DISPLACTX(chan)) ||
 790              vc4_state->feed_txp)) {
 791                 drm_crtc_send_vblank_event(crtc, vc4_crtc->event);
 792                 vc4_crtc->event = NULL;
 793                 drm_crtc_vblank_put(crtc);
 794         }
 795         spin_unlock_irqrestore(&dev->event_lock, flags);
 796 }
 797
 798 void vc4_crtc_handle_vblank(struct vc4_crtc *crtc)
 799 {
 800         crtc->t_vblank = ktime_get();
 801         drm_crtc_handle_vblank(&crtc->base);
 802         vc4_crtc_handle_page_flip(crtc);
 803 }
 804
 805 static irqreturn_t vc4_crtc_irq_handler(int irq, void *data)
 806 {
 807         struct vc4_crtc *vc4_crtc = data;
 808         u32 stat = CRTC_READ(PV_INTSTAT);
 809         irqreturn_t ret = IRQ_NONE;
 810
 811         if (stat & PV_INT_VFP_START) {
 812                 CRTC_WRITE(PV_INTSTAT, PV_INT_VFP_START);
 813                 vc4_crtc_handle_vblank(vc4_crtc);
 814                 ret = IRQ_HANDLED;
 815         }
 816
 817         return ret;
 818 }
 819
 820 struct vc4_async_flip_state {
 821         struct drm_crtc *crtc;
 822         struct drm_framebuffer *fb;
 823         struct drm_framebuffer *old_fb;
 824         struct drm_pending_vblank_event *event;
 825
 826         struct vc4_seqno_cb cb;
 827 };
 828
 829 /* Called when the V3D execution for the BO being flipped to is done, so that
 830  * we can actually update the plane's address to point to it.
 831  */
 832 static void
 833 vc4_async_page_flip_complete(struct vc4_seqno_cb *cb)
 834 {
 835         struct vc4_async_flip_state *flip_state =
 836                 container_of(cb, struct vc4_async_flip_state, cb);
 837         struct drm_crtc *crtc = flip_state->crtc;
 838         struct drm_device *dev = crtc->dev;
 839         struct vc4_dev *vc4 = to_vc4_dev(dev);
 840         struct drm_plane *plane = crtc->primary;
 841
 842         vc4_plane_async_set_fb(plane, flip_state->fb);
 843         if (flip_state->event) {
 844                 unsigned long flags;
 845
 846                 spin_lock_irqsave(&dev->event_lock, flags);
 847                 drm_crtc_send_vblank_event(crtc, flip_state->event);
 848                 spin_unlock_irqrestore(&dev->event_lock, flags);
 849         }
 850
 851         drm_crtc_vblank_put(crtc);
 852         drm_framebuffer_put(flip_state->fb);
 853
 854         /* Decrement the BO usecnt in order to keep the inc/dec calls balanced
 855          * when the planes are updated through the async update path.
 856          * FIXME: we should move to generic async-page-flip when it's
 857          * available, so that we can get rid of this hand-made cleanup_fb()
 858          * logic.
 859          */
 860         if (flip_state->old_fb) {
 861                 struct drm_gem_cma_object *cma_bo;
 862                 struct vc4_bo *bo;
 863
 864                 cma_bo = drm_fb_cma_get_gem_obj(flip_state->old_fb, 0);
 865                 bo = to_vc4_bo(&cma_bo->base);
 866                 vc4_bo_dec_usecnt(bo);
 867                 drm_framebuffer_put(flip_state->old_fb);
 868         }
 869
 870         kfree(flip_state);
 871
 872         up(&vc4->async_modeset);
 873 }
 874
 875 /* Implements async (non-vblank-synced) page flips.
 876  *
 877  * The page flip ioctl needs to return immediately, so we grab the
 878  * modeset semaphore on the pipe, and queue the address update for
 879  * when V3D is done with the BO being flipped to.
 880  */
 881 static int vc4_async_page_flip(struct drm_crtc *crtc,
 882                                struct drm_framebuffer *fb,
 883                                struct drm_pending_vblank_event *event,
 884                                uint32_t flags)
 885 {
 886         struct drm_device *dev = crtc->dev;
 887         struct vc4_dev *vc4 = to_vc4_dev(dev);
 888         struct drm_plane *plane = crtc->primary;
 889         int ret = 0;
 890         struct vc4_async_flip_state *flip_state;
 891         struct drm_gem_cma_object *cma_bo = drm_fb_cma_get_gem_obj(fb, 0);
 892         struct vc4_bo *bo = to_vc4_bo(&cma_bo->base);
 893
 894         /* Increment the BO usecnt here, so that we never end up with an
 895          * unbalanced number of vc4_bo_{dec,inc}_usecnt() calls when the
 896          * plane is later updated through the non-async path.
 897          * FIXME: we should move to generic async-page-flip when it's
 898          * available, so that we can get rid of this hand-made prepare_fb()
 899          * logic.
 900          */
 901         ret = vc4_bo_inc_usecnt(bo);
 902         if (ret)
 903                 return ret;
 904
 905         flip_state = kzalloc(sizeof(*flip_state), GFP_KERNEL);
 906         if (!flip_state) {
 907                 vc4_bo_dec_usecnt(bo);
 908                 return -ENOMEM;
 909         }
 910
 911         drm_framebuffer_get(fb);
 912         flip_state->fb = fb;
 913         flip_state->crtc = crtc;
 914         flip_state->event = event;
 915
 916         /* Make sure all other async modesetes have landed. */
 917         ret = down_interruptible(&vc4->async_modeset);
 918         if (ret) {
 919                 drm_framebuffer_put(fb);
 920                 vc4_bo_dec_usecnt(bo);
 921                 kfree(flip_state);
 922                 return ret;
 923         }
 924
 925         /* Save the current FB before it's replaced by the new one in
 926          * drm_atomic_set_fb_for_plane(). We'll need the old FB in
 927          * vc4_async_page_flip_complete() to decrement the BO usecnt and keep
 928          * it consistent.
 929          * FIXME: we should move to generic async-page-flip when it's
 930          * available, so that we can get rid of this hand-made cleanup_fb()
 931          * logic.
 932          */
 933         flip_state->old_fb = plane->state->fb;
 934         if (flip_state->old_fb)
 935                 drm_framebuffer_get(flip_state->old_fb);
 936
 937         WARN_ON(drm_crtc_vblank_get(crtc) != 0);
 938
 939         /* Immediately update the plane's legacy fb pointer, so that later
 940          * modeset prep sees the state that will be present when the semaphore
 941          * is released.
 942          */
 943         drm_atomic_set_fb_for_plane(plane->state, fb);
 944
 945         vc4_queue_seqno_cb(dev, &flip_state->cb, bo->seqno,
 946                            vc4_async_page_flip_complete);
 947
 948         /* Driver takes ownership of state on successful async commit. */
 949         return 0;
 950 }
 951
 952 static int vc4_page_flip(struct drm_crtc *crtc,
 953                          struct drm_framebuffer *fb,
 954                          struct drm_pending_vblank_event *event,
 955                          uint32_t flags,
 956                          struct drm_modeset_acquire_ctx *ctx)
 957 {
 958         if (flags & DRM_MODE_PAGE_FLIP_ASYNC)
 959                 return vc4_async_page_flip(crtc, fb, event, flags);
 960         else
 961                 return drm_atomic_helper_page_flip(crtc, fb, event, flags, ctx);
 962 }
 963
 964 static struct drm_crtc_state *vc4_crtc_duplicate_state(struct drm_crtc *crtc)
 965 {
 966         struct vc4_crtc_state *vc4_state, *old_vc4_state;
 967
 968         vc4_state = kzalloc(sizeof(*vc4_state), GFP_KERNEL);
 969         if (!vc4_state)
 970                 return NULL;
 971
 972         old_vc4_state = to_vc4_crtc_state(crtc->state);
 973         vc4_state->feed_txp = old_vc4_state->feed_txp;
 974
 975         __drm_atomic_helper_crtc_duplicate_state(crtc, &vc4_state->base);
 976         return &vc4_state->base;
 977 }
 978
 979 static void vc4_crtc_destroy_state(struct drm_crtc *crtc,
 980                                    struct drm_crtc_state *state)
 981 {
 982         struct vc4_dev *vc4 = to_vc4_dev(crtc->dev);
 983         struct vc4_crtc_state *vc4_state = to_vc4_crtc_state(state);
 984
 985         if (vc4_state->mm.allocated) {
 986                 unsigned long flags;
 987
 988                 spin_lock_irqsave(&vc4->hvs->mm_lock, flags);
 989                 drm_mm_remove_node(&vc4_state->mm);
 990                 spin_unlock_irqrestore(&vc4->hvs->mm_lock, flags);
 991
 992         }
 993
 994         drm_atomic_helper_crtc_destroy_state(crtc, state);
 995 }
 996
 997 static void
 998 vc4_crtc_reset(struct drm_crtc *crtc)
 999 {
1000         if (crtc->state)
1001                 __drm_atomic_helper_crtc_destroy_state(crtc->state);
1002
1003         crtc->state = kzalloc(sizeof(struct vc4_crtc_state), GFP_KERNEL);
1004         if (crtc->state)
1005                 crtc->state->crtc = crtc;
1006 }
1007
1008 static const struct drm_crtc_funcs vc4_crtc_funcs = {
1009         .set_config = drm_atomic_helper_set_config,
1010         .destroy = vc4_crtc_destroy,
1011         .page_flip = vc4_page_flip,
1012         .set_property = NULL,
1013         .cursor_set = NULL, /* handled by drm_mode_cursor_universal */
1014         .cursor_move = NULL, /* handled by drm_mode_cursor_universal */
1015         .reset = vc4_crtc_reset,
1016         .atomic_duplicate_state = vc4_crtc_duplicate_state,
1017         .atomic_destroy_state = vc4_crtc_destroy_state,
1018         .gamma_set = drm_atomic_helper_legacy_gamma_set,
1019         .enable_vblank = vc4_enable_vblank,
1020         .disable_vblank = vc4_disable_vblank,
1021 };
1022
1023 static const struct drm_crtc_helper_funcs vc4_crtc_helper_funcs = {
1024         .mode_set_nofb = vc4_crtc_mode_set_nofb,
1025         .mode_valid = vc4_crtc_mode_valid,
1026         .atomic_check = vc4_crtc_atomic_check,
1027         .atomic_flush = vc4_crtc_atomic_flush,
1028         .atomic_enable = vc4_crtc_atomic_enable,
1029         .atomic_disable = vc4_crtc_atomic_disable,
1030 };
1031
1032 static const struct vc4_crtc_data pv0_data = {
1033         .hvs_channel = 0,
1034         .encoder_types = {
1035                 [PV_CONTROL_CLK_SELECT_DSI] = VC4_ENCODER_TYPE_DSI0,
1036                 [PV_CONTROL_CLK_SELECT_DPI_SMI_HDMI] = VC4_ENCODER_TYPE_DPI,
1037         },
1038 };
1039
1040 static const struct vc4_crtc_data pv1_data = {
1041         .hvs_channel = 2,
1042         .encoder_types = {
1043                 [PV_CONTROL_CLK_SELECT_DSI] = VC4_ENCODER_TYPE_DSI1,
1044                 [PV_CONTROL_CLK_SELECT_DPI_SMI_HDMI] = VC4_ENCODER_TYPE_SMI,
1045         },
1046 };
1047
1048 static const struct vc4_crtc_data pv2_data = {
1049         .hvs_channel = 1,
1050         .encoder_types = {
1051                 [PV_CONTROL_CLK_SELECT_DPI_SMI_HDMI] = VC4_ENCODER_TYPE_HDMI,
1052                 [PV_CONTROL_CLK_SELECT_VEC] = VC4_ENCODER_TYPE_VEC,
1053         },
1054 };
1055
1056 static const struct of_device_id vc4_crtc_dt_match[] = {
1057         { .compatible = "brcm,bcm2835-pixelvalve0", .data = &pv0_data },
1058         { .compatible = "brcm,bcm2835-pixelvalve1", .data = &pv1_data },
1059         { .compatible = "brcm,bcm2835-pixelvalve2", .data = &pv2_data },
1060         {}
1061 };
1062
1063 static void vc4_set_crtc_possible_masks(struct drm_device *drm,
1064                                         struct drm_crtc *crtc)
1065 {
1066         struct vc4_crtc *vc4_crtc = to_vc4_crtc(crtc);
1067         const struct vc4_crtc_data *crtc_data = vc4_crtc->data;
1068         const enum vc4_encoder_type *encoder_types = crtc_data->encoder_types;
1069         struct drm_encoder *encoder;
1070
1071         drm_for_each_encoder(encoder, drm) {
1072                 struct vc4_encoder *vc4_encoder;
1073                 int i;
1074
1075                 /* HVS FIFO2 can feed the TXP IP. */
1076                 if (crtc_data->hvs_channel == 2 &&
1077                     encoder->encoder_type == DRM_MODE_ENCODER_VIRTUAL) {
1078                         encoder->possible_crtcs |= drm_crtc_mask(crtc);
1079                         continue;
1080                 }
1081
1082                 vc4_encoder = to_vc4_encoder(encoder);
1083                 for (i = 0; i < ARRAY_SIZE(crtc_data->encoder_types); i++) {
1084                         if (vc4_encoder->type == encoder_types[i]) {
1085                                 vc4_encoder->clock_select = i;
1086                                 encoder->possible_crtcs |= drm_crtc_mask(crtc);
1087                                 break;
1088                         }
1089                 }
1090         }
1091 }
1092
1093 static void
1094 vc4_crtc_get_cob_allocation(struct vc4_crtc *vc4_crtc)
1095 {
1096         struct drm_device *drm = vc4_crtc->base.dev;
1097         struct vc4_dev *vc4 = to_vc4_dev(drm);
1098         u32 dispbase = HVS_READ(SCALER_DISPBASEX(vc4_crtc->channel));
1099         /* Top/base are supposed to be 4-pixel aligned, but the
1100          * Raspberry Pi firmware fills the low bits (which are
1101          * presumably ignored).
1102          */
1103         u32 top = VC4_GET_FIELD(dispbase, SCALER_DISPBASEX_TOP) & ~3;
1104         u32 base = VC4_GET_FIELD(dispbase, SCALER_DISPBASEX_BASE) & ~3;
1105
1106         vc4_crtc->cob_size = top - base + 4;
1107 }
1108
1109 static int vc4_crtc_bind(struct device *dev, struct device *master, void *data)
1110 {
1111         struct platform_device *pdev = to_platform_device(dev);
1112         struct drm_device *drm = dev_get_drvdata(master);
1113         struct vc4_crtc *vc4_crtc;
1114         struct drm_crtc *crtc;
1115         struct drm_plane *primary_plane, *cursor_plane, *destroy_plane, *temp;
1116         const struct of_device_id *match;
1117         int ret, i;
1118
1119         vc4_crtc = devm_kzalloc(dev, sizeof(*vc4_crtc), GFP_KERNEL);
1120         if (!vc4_crtc)
1121                 return -ENOMEM;
1122         crtc = &vc4_crtc->base;
1123
1124         match = of_match_device(vc4_crtc_dt_match, dev);
1125         if (!match)
1126                 return -ENODEV;
1127         vc4_crtc->data = match->data;
1128
1129         vc4_crtc->regs = vc4_ioremap_regs(pdev, 0);
1130         if (IS_ERR(vc4_crtc->regs))
1131                 return PTR_ERR(vc4_crtc->regs);
1132
1133         /* For now, we create just the primary and the legacy cursor
1134          * planes.  We should be able to stack more planes on easily,
1135          * but to do that we would need to compute the bandwidth
1136          * requirement of the plane configuration, and reject ones
1137          * that will take too much.
1138          */
1139         primary_plane = vc4_plane_init(drm, DRM_PLANE_TYPE_PRIMARY);
1140         if (IS_ERR(primary_plane)) {
1141                 dev_err(dev, "failed to construct primary plane\n");
1142                 ret = PTR_ERR(primary_plane);
1143                 goto err;
1144         }
1145
1146         drm_crtc_init_with_planes(drm, crtc, primary_plane, NULL,
1147                                   &vc4_crtc_funcs, NULL);
1148         drm_crtc_helper_add(crtc, &vc4_crtc_helper_funcs);
1149         vc4_crtc->channel = vc4_crtc->data->hvs_channel;
1150         drm_mode_crtc_set_gamma_size(crtc, ARRAY_SIZE(vc4_crtc->lut_r));
1151         drm_crtc_enable_color_mgmt(crtc, 0, false, crtc->gamma_size);
1152
1153         /* We support CTM, but only for one CRTC at a time. It's therefore
1154          * implemented as private driver state in vc4_kms, not here.
1155          */
1156         drm_crtc_enable_color_mgmt(crtc, 0, true, crtc->gamma_size);
1157
1158         /* Set up some arbitrary number of planes.  We're not limited
1159          * by a set number of physical registers, just the space in
1160          * the HVS (16k) and how small an plane can be (28 bytes).
1161          * However, each plane we set up takes up some memory, and
1162          * increases the cost of looping over planes, which atomic
1163          * modesetting does quite a bit.  As a result, we pick a
1164          * modest number of planes to expose, that should hopefully
1165          * still cover any sane usecase.
1166          */
1167         for (i = 0; i < 8; i++) {
1168                 struct drm_plane *plane =
1169                         vc4_plane_init(drm, DRM_PLANE_TYPE_OVERLAY);
1170
1171                 if (IS_ERR(plane))
1172                         continue;
1173
1174                 plane->possible_crtcs = drm_crtc_mask(crtc);
1175         }
1176
1177         /* Set up the legacy cursor after overlay initialization,
1178          * since we overlay planes on the CRTC in the order they were
1179          * initialized.
1180          */
1181         cursor_plane = vc4_plane_init(drm, DRM_PLANE_TYPE_CURSOR);
1182         if (!IS_ERR(cursor_plane)) {
1183                 cursor_plane->possible_crtcs = drm_crtc_mask(crtc);
1184                 crtc->cursor = cursor_plane;
1185         }
1186
1187         vc4_crtc_get_cob_allocation(vc4_crtc);
1188
1189         CRTC_WRITE(PV_INTEN, 0);
1190         CRTC_WRITE(PV_INTSTAT, PV_INT_VFP_START);
1191         ret = devm_request_irq(dev, platform_get_irq(pdev, 0),
1192                                vc4_crtc_irq_handler, 0, "vc4 crtc", vc4_crtc);
1193         if (ret)
1194                 goto err_destroy_planes;
1195
1196         vc4_set_crtc_possible_masks(drm, crtc);
1197
1198         for (i = 0; i < crtc->gamma_size; i++) {
1199                 vc4_crtc->lut_r[i] = i;
1200                 vc4_crtc->lut_g[i] = i;
1201                 vc4_crtc->lut_b[i] = i;
1202         }
1203
1204         platform_set_drvdata(pdev, vc4_crtc);
1205
1206         return 0;
1207
1208 err_destroy_planes:
1209         list_for_each_entry_safe(destroy_plane, temp,
1210                                  &drm->mode_config.plane_list, head) {
1211                 if (destroy_plane->possible_crtcs == drm_crtc_mask(crtc))
1212                     destroy_plane->funcs->destroy(destroy_plane);
1213         }
1214 err:
1215         return ret;
1216 }
1217
1218 static void vc4_crtc_unbind(struct device *dev, struct device *master,
1219                             void *data)
1220 {
1221         struct platform_device *pdev = to_platform_device(dev);
1222         struct vc4_crtc *vc4_crtc = dev_get_drvdata(dev);
1223
1224         vc4_crtc_destroy(&vc4_crtc->base);
1225
1226         CRTC_WRITE(PV_INTEN, 0);
1227
1228         platform_set_drvdata(pdev, NULL);
1229 }
1230
1231 static const struct component_ops vc4_crtc_ops = {
1232         .bind   = vc4_crtc_bind,
1233         .unbind = vc4_crtc_unbind,
1234 };
1235
1236 static int vc4_crtc_dev_probe(struct platform_device *pdev)
1237 {
1238         return component_add(&pdev->dev, &vc4_crtc_ops);
1239 }
1240
1241 static int vc4_crtc_dev_remove(struct platform_device *pdev)
1242 {
1243         component_del(&pdev->dev, &vc4_crtc_ops);
1244         return 0;
1245 }
1246
1247 struct platform_driver vc4_crtc_driver = {
1248         .probe = vc4_crtc_dev_probe,
1249         .remove = vc4_crtc_dev_remove,
1250         .driver = {
1251                 .name = "vc4_crtc",
1252                 .of_match_table = vc4_crtc_dt_match,
1253         },
1254 };