drivers/gpu/drm/vc4/vc4_hvs.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * Copyright (C) 2015 Broadcom
   4  */
   5
   6 /**
   7  * DOC: VC4 HVS module.
   8  *
   9  * The Hardware Video Scaler (HVS) is the piece of hardware that does
  10  * translation, scaling, colorspace conversion, and compositing of
  11  * pixels stored in framebuffers into a FIFO of pixels going out to
  12  * the Pixel Valve (CRTC).  It operates at the system clock rate (the
  13  * system audio clock gate, specifically), which is much higher than
  14  * the pixel clock rate.
  15  *
  16  * There is a single global HVS, with multiple output FIFOs that can
  17  * be consumed by the PVs.  This file just manages the resources for
  18  * the HVS, while the vc4_crtc.c code actually drives HVS setup for
  19  * each CRTC.
  20  */
  21
  22 #include <linux/bitfield.h>
  23 #include <linux/clk.h>
  24 #include <linux/component.h>
  25 #include <linux/platform_device.h>
  26
  27 #include <drm/drm_atomic_helper.h>
  28 #include <drm/drm_vblank.h>
  29
  30 #include "vc4_drv.h"
  31 #include "vc4_regs.h"
  32
  33 static const struct debugfs_reg32 hvs_regs[] = {
  34         VC4_REG32(SCALER_DISPCTRL),
  35         VC4_REG32(SCALER_DISPSTAT),
  36         VC4_REG32(SCALER_DISPID),
  37         VC4_REG32(SCALER_DISPECTRL),
  38         VC4_REG32(SCALER_DISPPROF),
  39         VC4_REG32(SCALER_DISPDITHER),
  40         VC4_REG32(SCALER_DISPEOLN),
  41         VC4_REG32(SCALER_DISPLIST0),
  42         VC4_REG32(SCALER_DISPLIST1),
  43         VC4_REG32(SCALER_DISPLIST2),
  44         VC4_REG32(SCALER_DISPLSTAT),
  45         VC4_REG32(SCALER_DISPLACT0),
  46         VC4_REG32(SCALER_DISPLACT1),
  47         VC4_REG32(SCALER_DISPLACT2),
  48         VC4_REG32(SCALER_DISPCTRL0),
  49         VC4_REG32(SCALER_DISPBKGND0),
  50         VC4_REG32(SCALER_DISPSTAT0),
  51         VC4_REG32(SCALER_DISPBASE0),
  52         VC4_REG32(SCALER_DISPCTRL1),
  53         VC4_REG32(SCALER_DISPBKGND1),
  54         VC4_REG32(SCALER_DISPSTAT1),
  55         VC4_REG32(SCALER_DISPBASE1),
  56         VC4_REG32(SCALER_DISPCTRL2),
  57         VC4_REG32(SCALER_DISPBKGND2),
  58         VC4_REG32(SCALER_DISPSTAT2),
  59         VC4_REG32(SCALER_DISPBASE2),
  60         VC4_REG32(SCALER_DISPALPHA2),
  61         VC4_REG32(SCALER_OLEDOFFS),
  62         VC4_REG32(SCALER_OLEDCOEF0),
  63         VC4_REG32(SCALER_OLEDCOEF1),
  64         VC4_REG32(SCALER_OLEDCOEF2),
  65 };
  66
  67 void vc4_hvs_dump_state(struct drm_device *dev)
  68 {
  69         struct vc4_dev *vc4 = to_vc4_dev(dev);
  70         struct drm_printer p = drm_info_printer(&vc4->hvs->pdev->dev);
  71         int i;
  72
  73         drm_print_regset32(&p, &vc4->hvs->regset);
  74
  75         DRM_INFO("HVS ctx:\n");
  76         for (i = 0; i < 64; i += 4) {
  77                 DRM_INFO("0x%08x (%s): 0x%08x 0x%08x 0x%08x 0x%08x\n",
  78                          i * 4, i < HVS_BOOTLOADER_DLIST_END ? "B" : "D",
  79                          readl((u32 __iomem *)vc4->hvs->dlist + i + 0),
  80                          readl((u32 __iomem *)vc4->hvs->dlist + i + 1),
  81                          readl((u32 __iomem *)vc4->hvs->dlist + i + 2),
  82                          readl((u32 __iomem *)vc4->hvs->dlist + i + 3));
  83         }
  84 }
  85
  86 static int vc4_hvs_debugfs_underrun(struct seq_file *m, void *data)
  87 {
  88         struct drm_info_node *node = m->private;
  89         struct drm_device *dev = node->minor->dev;
  90         struct vc4_dev *vc4 = to_vc4_dev(dev);
  91         struct drm_printer p = drm_seq_file_printer(m);
  92
  93         drm_printf(&p, "%d\n", atomic_read(&vc4->underrun));
  94
  95         return 0;
  96 }
  97
  98 /* The filter kernel is composed of dwords each containing 3 9-bit
  99  * signed integers packed next to each other.
 100  */
 101 #define VC4_INT_TO_COEFF(coeff) (coeff & 0x1ff)
 102 #define VC4_PPF_FILTER_WORD(c0, c1, c2)                         \
 103         ((((c0) & 0x1ff) << 0) |                                \
 104          (((c1) & 0x1ff) << 9) |                                \
 105          (((c2) & 0x1ff) << 18))
 106
 107 /* The whole filter kernel is arranged as the coefficients 0-16 going
 108  * up, then a pad, then 17-31 going down and reversed within the
 109  * dwords.  This means that a linear phase kernel (where it's
 110  * symmetrical at the boundary between 15 and 16) has the last 5
 111  * dwords matching the first 5, but reversed.
 112  */
 113 #define VC4_LINEAR_PHASE_KERNEL(c0, c1, c2, c3, c4, c5, c6, c7, c8,     \
 114                                 c9, c10, c11, c12, c13, c14, c15)       \
 115         {VC4_PPF_FILTER_WORD(c0, c1, c2),                               \
 116          VC4_PPF_FILTER_WORD(c3, c4, c5),                               \
 117          VC4_PPF_FILTER_WORD(c6, c7, c8),                               \
 118          VC4_PPF_FILTER_WORD(c9, c10, c11),                             \
 119          VC4_PPF_FILTER_WORD(c12, c13, c14),                            \
 120          VC4_PPF_FILTER_WORD(c15, c15, 0)}
 121
 122 #define VC4_LINEAR_PHASE_KERNEL_DWORDS 6
 123 #define VC4_KERNEL_DWORDS (VC4_LINEAR_PHASE_KERNEL_DWORDS * 2 - 1)
 124
 125 /* Recommended B=1/3, C=1/3 filter choice from Mitchell/Netravali.
 126  * http://www.cs.utexas.edu/~fussell/courses/cs384g/lectures/mitchell/Mitchell.pdf
 127  */
 128 static const u32 mitchell_netravali_1_3_1_3_kernel[] =
 129         VC4_LINEAR_PHASE_KERNEL(0, -2, -6, -8, -10, -8, -3, 2, 18,
 130                                 50, 82, 119, 155, 187, 213, 227);
 131
 132 static int vc4_hvs_upload_linear_kernel(struct vc4_hvs *hvs,
 133                                         struct drm_mm_node *space,
 134                                         const u32 *kernel)
 135 {
 136         int ret, i;
 137         u32 __iomem *dst_kernel;
 138
 139         ret = drm_mm_insert_node(&hvs->dlist_mm, space, VC4_KERNEL_DWORDS);
 140         if (ret) {
 141                 DRM_ERROR("Failed to allocate space for filter kernel: %d\n",
 142                           ret);
 143                 return ret;
 144         }
 145
 146         dst_kernel = hvs->dlist + space->start;
 147
 148         for (i = 0; i < VC4_KERNEL_DWORDS; i++) {
 149                 if (i < VC4_LINEAR_PHASE_KERNEL_DWORDS)
 150                         writel(kernel[i], &dst_kernel[i]);
 151                 else {
 152                         writel(kernel[VC4_KERNEL_DWORDS - i - 1],
 153                                &dst_kernel[i]);
 154                 }
 155         }
 156
 157         return 0;
 158 }
 159
 160 static void vc4_hvs_lut_load(struct drm_crtc *crtc)
 161 {
 162         struct drm_device *dev = crtc->dev;
 163         struct vc4_dev *vc4 = to_vc4_dev(dev);
 164         struct vc4_crtc *vc4_crtc = to_vc4_crtc(crtc);
 165         struct vc4_crtc_state *vc4_state = to_vc4_crtc_state(crtc->state);
 166         u32 i;
 167
 168         /* The LUT memory is laid out with each HVS channel in order,
 169          * each of which takes 256 writes for R, 256 for G, then 256
 170          * for B.
 171          */
 172         HVS_WRITE(SCALER_GAMADDR,
 173                   SCALER_GAMADDR_AUTOINC |
 174                   (vc4_state->assigned_channel * 3 * crtc->gamma_size));
 175
 176         for (i = 0; i < crtc->gamma_size; i++)
 177                 HVS_WRITE(SCALER_GAMDATA, vc4_crtc->lut_r[i]);
 178         for (i = 0; i < crtc->gamma_size; i++)
 179                 HVS_WRITE(SCALER_GAMDATA, vc4_crtc->lut_g[i]);
 180         for (i = 0; i < crtc->gamma_size; i++)
 181                 HVS_WRITE(SCALER_GAMDATA, vc4_crtc->lut_b[i]);
 182 }
 183
 184 static void vc4_hvs_update_gamma_lut(struct drm_crtc *crtc)
 185 {
 186         struct vc4_crtc *vc4_crtc = to_vc4_crtc(crtc);
 187         struct drm_color_lut *lut = crtc->state->gamma_lut->data;
 188         u32 length = drm_color_lut_size(crtc->state->gamma_lut);
 189         u32 i;
 190
 191         for (i = 0; i < length; i++) {
 192                 vc4_crtc->lut_r[i] = drm_color_lut_extract(lut[i].red, 8);
 193                 vc4_crtc->lut_g[i] = drm_color_lut_extract(lut[i].green, 8);
 194                 vc4_crtc->lut_b[i] = drm_color_lut_extract(lut[i].blue, 8);
 195         }
 196
 197         vc4_hvs_lut_load(crtc);
 198 }
 199
 200 int vc4_hvs_get_fifo_from_output(struct drm_device *dev, unsigned int output)
 201 {
 202         struct vc4_dev *vc4 = to_vc4_dev(dev);
 203         u32 reg;
 204         int ret;
 205
 206         if (!vc4->hvs->hvs5)
 207                 return output;
 208
 209         switch (output) {
 210         case 0:
 211                 return 0;
 212
 213         case 1:
 214                 return 1;
 215
 216         case 2:
 217                 reg = HVS_READ(SCALER_DISPECTRL);
 218                 ret = FIELD_GET(SCALER_DISPECTRL_DSP2_MUX_MASK, reg);
 219                 if (ret == 0)
 220                         return 2;
 221
 222                 return 0;
 223
 224         case 3:
 225                 reg = HVS_READ(SCALER_DISPCTRL);
 226                 ret = FIELD_GET(SCALER_DISPCTRL_DSP3_MUX_MASK, reg);
 227                 if (ret == 3)
 228                         return -EPIPE;
 229
 230                 return ret;
 231
 232         case 4:
 233                 reg = HVS_READ(SCALER_DISPEOLN);
 234                 ret = FIELD_GET(SCALER_DISPEOLN_DSP4_MUX_MASK, reg);
 235                 if (ret == 3)
 236                         return -EPIPE;
 237
 238                 return ret;
 239
 240         case 5:
 241                 reg = HVS_READ(SCALER_DISPDITHER);
 242                 ret = FIELD_GET(SCALER_DISPDITHER_DSP5_MUX_MASK, reg);
 243                 if (ret == 3)
 244                         return -EPIPE;
 245
 246                 return ret;
 247
 248         default:
 249                 return -EPIPE;
 250         }
 251 }
 252
 253 static int vc4_hvs_init_channel(struct vc4_dev *vc4, struct drm_crtc *crtc,
 254                                 struct drm_display_mode *mode, bool oneshot)
 255 {
 256         struct vc4_crtc_state *vc4_crtc_state = to_vc4_crtc_state(crtc->state);
 257         unsigned int chan = vc4_crtc_state->assigned_channel;
 258         bool interlace = mode->flags & DRM_MODE_FLAG_INTERLACE;
 259         u32 dispbkgndx;
 260         u32 dispctrl;
 261
 262         HVS_WRITE(SCALER_DISPCTRLX(chan), 0);
 263         HVS_WRITE(SCALER_DISPCTRLX(chan), SCALER_DISPCTRLX_RESET);
 264         HVS_WRITE(SCALER_DISPCTRLX(chan), 0);
 265
 266         /* Turn on the scaler, which will wait for vstart to start
 267          * compositing.
 268          * When feeding the transposer, we should operate in oneshot
 269          * mode.
 270          */
 271         dispctrl = SCALER_DISPCTRLX_ENABLE;
 272
 273         if (!vc4->hvs->hvs5)
 274                 dispctrl |= VC4_SET_FIELD(mode->hdisplay,
 275                                           SCALER_DISPCTRLX_WIDTH) |
 276                             VC4_SET_FIELD(mode->vdisplay,
 277                                           SCALER_DISPCTRLX_HEIGHT) |
 278                             (oneshot ? SCALER_DISPCTRLX_ONESHOT : 0);
 279         else
 280                 dispctrl |= VC4_SET_FIELD(mode->hdisplay,
 281                                           SCALER5_DISPCTRLX_WIDTH) |
 282                             VC4_SET_FIELD(mode->vdisplay,
 283                                           SCALER5_DISPCTRLX_HEIGHT) |
 284                             (oneshot ? SCALER5_DISPCTRLX_ONESHOT : 0);
 285
 286         HVS_WRITE(SCALER_DISPCTRLX(chan), dispctrl);
 287
 288         dispbkgndx = HVS_READ(SCALER_DISPBKGNDX(chan));
 289         dispbkgndx &= ~SCALER_DISPBKGND_GAMMA;
 290         dispbkgndx &= ~SCALER_DISPBKGND_INTERLACE;
 291
 292         HVS_WRITE(SCALER_DISPBKGNDX(chan), dispbkgndx |
 293                   SCALER_DISPBKGND_AUTOHS |
 294                   ((!vc4->hvs->hvs5) ? SCALER_DISPBKGND_GAMMA : 0) |
 295                   (interlace ? SCALER_DISPBKGND_INTERLACE : 0));
 296
 297         /* Reload the LUT, since the SRAMs would have been disabled if
 298          * all CRTCs had SCALER_DISPBKGND_GAMMA unset at once.
 299          */
 300         vc4_hvs_lut_load(crtc);
 301
 302         return 0;
 303 }
 304
 305 void vc4_hvs_stop_channel(struct drm_device *dev, unsigned int chan)
 306 {
 307         struct vc4_dev *vc4 = to_vc4_dev(dev);
 308
 309         if (HVS_READ(SCALER_DISPCTRLX(chan)) & SCALER_DISPCTRLX_ENABLE)
 310                 return;
 311
 312         HVS_WRITE(SCALER_DISPCTRLX(chan),
 313                   HVS_READ(SCALER_DISPCTRLX(chan)) | SCALER_DISPCTRLX_RESET);
 314         HVS_WRITE(SCALER_DISPCTRLX(chan),
 315                   HVS_READ(SCALER_DISPCTRLX(chan)) & ~SCALER_DISPCTRLX_ENABLE);
 316
 317         /* Once we leave, the scaler should be disabled and its fifo empty. */
 318         WARN_ON_ONCE(HVS_READ(SCALER_DISPCTRLX(chan)) & SCALER_DISPCTRLX_RESET);
 319
 320         WARN_ON_ONCE(VC4_GET_FIELD(HVS_READ(SCALER_DISPSTATX(chan)),
 321                                    SCALER_DISPSTATX_MODE) !=
 322                      SCALER_DISPSTATX_MODE_DISABLED);
 323
 324         WARN_ON_ONCE((HVS_READ(SCALER_DISPSTATX(chan)) &
 325                       (SCALER_DISPSTATX_FULL | SCALER_DISPSTATX_EMPTY)) !=
 326                      SCALER_DISPSTATX_EMPTY);
 327 }
 328
 329 int vc4_hvs_atomic_check(struct drm_crtc *crtc,
 330                          struct drm_crtc_state *state)
 331 {
 332         struct vc4_crtc_state *vc4_state = to_vc4_crtc_state(state);
 333         struct drm_device *dev = crtc->dev;
 334         struct vc4_dev *vc4 = to_vc4_dev(dev);
 335         struct drm_plane *plane;
 336         unsigned long flags;
 337         const struct drm_plane_state *plane_state;
 338         u32 dlist_count = 0;
 339         int ret;
 340
 341         /* The pixelvalve can only feed one encoder (and encoders are
 342          * 1:1 with connectors.)
 343          */
 344         if (hweight32(state->connector_mask) > 1)
 345                 return -EINVAL;
 346
 347         drm_atomic_crtc_state_for_each_plane_state(plane, plane_state, state)
 348                 dlist_count += vc4_plane_dlist_size(plane_state);
 349
 350         dlist_count++; /* Account for SCALER_CTL0_END. */
 351
 352         spin_lock_irqsave(&vc4->hvs->mm_lock, flags);
 353         ret = drm_mm_insert_node(&vc4->hvs->dlist_mm, &vc4_state->mm,
 354                                  dlist_count);
 355         spin_unlock_irqrestore(&vc4->hvs->mm_lock, flags);
 356         if (ret)
 357                 return ret;
 358
 359         return 0;
 360 }
 361
 362 static void vc4_hvs_update_dlist(struct drm_crtc *crtc)
 363 {
 364         struct drm_device *dev = crtc->dev;
 365         struct vc4_dev *vc4 = to_vc4_dev(dev);
 366         struct vc4_crtc *vc4_crtc = to_vc4_crtc(crtc);
 367         struct vc4_crtc_state *vc4_state = to_vc4_crtc_state(crtc->state);
 368
 369         if (crtc->state->event) {
 370                 unsigned long flags;
 371
 372                 crtc->state->event->pipe = drm_crtc_index(crtc);
 373
 374                 WARN_ON(drm_crtc_vblank_get(crtc) != 0);
 375
 376                 spin_lock_irqsave(&dev->event_lock, flags);
 377
 378                 if (!vc4_state->feed_txp || vc4_state->txp_armed) {
 379                         vc4_crtc->event = crtc->state->event;
 380                         crtc->state->event = NULL;
 381                 }
 382
 383                 HVS_WRITE(SCALER_DISPLISTX(vc4_state->assigned_channel),
 384                           vc4_state->mm.start);
 385
 386                 spin_unlock_irqrestore(&dev->event_lock, flags);
 387         } else {
 388                 HVS_WRITE(SCALER_DISPLISTX(vc4_state->assigned_channel),
 389                           vc4_state->mm.start);
 390         }
 391 }
 392
 393 void vc4_hvs_atomic_enable(struct drm_crtc *crtc,
 394                            struct drm_crtc_state *old_state)
 395 {
 396         struct drm_device *dev = crtc->dev;
 397         struct vc4_dev *vc4 = to_vc4_dev(dev);
 398         struct vc4_crtc_state *vc4_state = to_vc4_crtc_state(crtc->state);
 399         struct drm_display_mode *mode = &crtc->state->adjusted_mode;
 400         bool oneshot = vc4_state->feed_txp;
 401
 402         vc4_hvs_update_dlist(crtc);
 403         vc4_hvs_init_channel(vc4, crtc, mode, oneshot);
 404 }
 405
 406 void vc4_hvs_atomic_disable(struct drm_crtc *crtc,
 407                             struct drm_crtc_state *old_state)
 408 {
 409         struct drm_device *dev = crtc->dev;
 410         struct vc4_crtc_state *vc4_state = to_vc4_crtc_state(old_state);
 411         unsigned int chan = vc4_state->assigned_channel;
 412
 413         vc4_hvs_stop_channel(dev, chan);
 414 }
 415
 416 void vc4_hvs_atomic_flush(struct drm_crtc *crtc,
 417                           struct drm_crtc_state *old_state)
 418 {
 419         struct drm_device *dev = crtc->dev;
 420         struct vc4_dev *vc4 = to_vc4_dev(dev);
 421         struct vc4_crtc_state *vc4_state = to_vc4_crtc_state(crtc->state);
 422         struct drm_plane *plane;
 423         struct vc4_plane_state *vc4_plane_state;
 424         bool debug_dump_regs = false;
 425         bool enable_bg_fill = false;
 426         u32 __iomem *dlist_start = vc4->hvs->dlist + vc4_state->mm.start;
 427         u32 __iomem *dlist_next = dlist_start;
 428
 429         if (debug_dump_regs) {
 430                 DRM_INFO("CRTC %d HVS before:\n", drm_crtc_index(crtc));
 431                 vc4_hvs_dump_state(dev);
 432         }
 433
 434         /* Copy all the active planes' dlist contents to the hardware dlist. */
 435         drm_atomic_crtc_for_each_plane(plane, crtc) {
 436                 /* Is this the first active plane? */
 437                 if (dlist_next == dlist_start) {
 438                         /* We need to enable background fill when a plane
 439                          * could be alpha blending from the background, i.e.
 440                          * where no other plane is underneath. It suffices to
 441                          * consider the first active plane here since we set
 442                          * needs_bg_fill such that either the first plane
 443                          * already needs it or all planes on top blend from
 444                          * the first or a lower plane.
 445                          */
 446                         vc4_plane_state = to_vc4_plane_state(plane->state);
 447                         enable_bg_fill = vc4_plane_state->needs_bg_fill;
 448                 }
 449
 450                 dlist_next += vc4_plane_write_dlist(plane, dlist_next);
 451         }
 452
 453         writel(SCALER_CTL0_END, dlist_next);
 454         dlist_next++;
 455
 456         WARN_ON_ONCE(dlist_next - dlist_start != vc4_state->mm.size);
 457
 458         if (enable_bg_fill)
 459                 /* This sets a black background color fill, as is the case
 460                  * with other DRM drivers.
 461                  */
 462                 HVS_WRITE(SCALER_DISPBKGNDX(vc4_state->assigned_channel),
 463                           HVS_READ(SCALER_DISPBKGNDX(vc4_state->assigned_channel)) |
 464                           SCALER_DISPBKGND_FILL);
 465
 466         /* Only update DISPLIST if the CRTC was already running and is not
 467          * being disabled.
 468          * vc4_crtc_enable() takes care of updating the dlist just after
 469          * re-enabling VBLANK interrupts and before enabling the engine.
 470          * If the CRTC is being disabled, there's no point in updating this
 471          * information.
 472          */
 473         if (crtc->state->active && old_state->active)
 474                 vc4_hvs_update_dlist(crtc);
 475
 476         if (crtc->state->color_mgmt_changed) {
 477                 u32 dispbkgndx = HVS_READ(SCALER_DISPBKGNDX(vc4_state->assigned_channel));
 478
 479                 if (crtc->state->gamma_lut) {
 480                         vc4_hvs_update_gamma_lut(crtc);
 481                         dispbkgndx |= SCALER_DISPBKGND_GAMMA;
 482                 } else {
 483                         /* Unsetting DISPBKGND_GAMMA skips the gamma lut step
 484                          * in hardware, which is the same as a linear lut that
 485                          * DRM expects us to use in absence of a user lut.
 486                          */
 487                         dispbkgndx &= ~SCALER_DISPBKGND_GAMMA;
 488                 }
 489                 HVS_WRITE(SCALER_DISPBKGNDX(vc4_state->assigned_channel), dispbkgndx);
 490         }
 491
 492         if (debug_dump_regs) {
 493                 DRM_INFO("CRTC %d HVS after:\n", drm_crtc_index(crtc));
 494                 vc4_hvs_dump_state(dev);
 495         }
 496 }
 497
 498 void vc4_hvs_mask_underrun(struct drm_device *dev, int channel)
 499 {
 500         struct vc4_dev *vc4 = to_vc4_dev(dev);
 501         u32 dispctrl = HVS_READ(SCALER_DISPCTRL);
 502
 503         dispctrl &= ~SCALER_DISPCTRL_DSPEISLUR(channel);
 504
 505         HVS_WRITE(SCALER_DISPCTRL, dispctrl);
 506 }
 507
 508 void vc4_hvs_unmask_underrun(struct drm_device *dev, int channel)
 509 {
 510         struct vc4_dev *vc4 = to_vc4_dev(dev);
 511         u32 dispctrl = HVS_READ(SCALER_DISPCTRL);
 512
 513         dispctrl |= SCALER_DISPCTRL_DSPEISLUR(channel);
 514
 515         HVS_WRITE(SCALER_DISPSTAT,
 516                   SCALER_DISPSTAT_EUFLOW(channel));
 517         HVS_WRITE(SCALER_DISPCTRL, dispctrl);
 518 }
 519
 520 static void vc4_hvs_report_underrun(struct drm_device *dev)
 521 {
 522         struct vc4_dev *vc4 = to_vc4_dev(dev);
 523
 524         atomic_inc(&vc4->underrun);
 525         DRM_DEV_ERROR(dev->dev, "HVS underrun\n");
 526 }
 527
 528 static irqreturn_t vc4_hvs_irq_handler(int irq, void *data)
 529 {
 530         struct drm_device *dev = data;
 531         struct vc4_dev *vc4 = to_vc4_dev(dev);
 532         irqreturn_t irqret = IRQ_NONE;
 533         int channel;
 534         u32 control;
 535         u32 status;
 536
 537         status = HVS_READ(SCALER_DISPSTAT);
 538         control = HVS_READ(SCALER_DISPCTRL);
 539
 540         for (channel = 0; channel < SCALER_CHANNELS_COUNT; channel++) {
 541                 /* Interrupt masking is not always honored, so check it here. */
 542                 if (status & SCALER_DISPSTAT_EUFLOW(channel) &&
 543                     control & SCALER_DISPCTRL_DSPEISLUR(channel)) {
 544                         vc4_hvs_mask_underrun(dev, channel);
 545                         vc4_hvs_report_underrun(dev);
 546
 547                         irqret = IRQ_HANDLED;
 548                 }
 549         }
 550
 551         /* Clear every per-channel interrupt flag. */
 552         HVS_WRITE(SCALER_DISPSTAT, SCALER_DISPSTAT_IRQMASK(0) |
 553                                    SCALER_DISPSTAT_IRQMASK(1) |
 554                                    SCALER_DISPSTAT_IRQMASK(2));
 555
 556         return irqret;
 557 }
 558
 559 static int vc4_hvs_bind(struct device *dev, struct device *master, void *data)
 560 {
 561         struct platform_device *pdev = to_platform_device(dev);
 562         struct drm_device *drm = dev_get_drvdata(master);
 563         struct vc4_dev *vc4 = to_vc4_dev(drm);
 564         struct vc4_hvs *hvs = NULL;
 565         int ret;
 566         u32 dispctrl;
 567
 568         hvs = devm_kzalloc(&pdev->dev, sizeof(*hvs), GFP_KERNEL);
 569         if (!hvs)
 570                 return -ENOMEM;
 571
 572         hvs->pdev = pdev;
 573
 574         if (of_device_is_compatible(pdev->dev.of_node, "brcm,bcm2711-hvs"))
 575                 hvs->hvs5 = true;
 576
 577         hvs->regs = vc4_ioremap_regs(pdev, 0);
 578         if (IS_ERR(hvs->regs))
 579                 return PTR_ERR(hvs->regs);
 580
 581         hvs->regset.base = hvs->regs;
 582         hvs->regset.regs = hvs_regs;
 583         hvs->regset.nregs = ARRAY_SIZE(hvs_regs);
 584
 585         if (hvs->hvs5) {
 586                 hvs->core_clk = devm_clk_get(&pdev->dev, NULL);
 587                 if (IS_ERR(hvs->core_clk)) {
 588                         dev_err(&pdev->dev, "Couldn't get core clock\n");
 589                         return PTR_ERR(hvs->core_clk);
 590                 }
 591
 592                 ret = clk_prepare_enable(hvs->core_clk);
 593                 if (ret) {
 594                         dev_err(&pdev->dev, "Couldn't enable the core clock\n");
 595                         return ret;
 596                 }
 597         }
 598
 599         if (!hvs->hvs5)
 600                 hvs->dlist = hvs->regs + SCALER_DLIST_START;
 601         else
 602                 hvs->dlist = hvs->regs + SCALER5_DLIST_START;
 603
 604         spin_lock_init(&hvs->mm_lock);
 605
 606         /* Set up the HVS display list memory manager.  We never
 607          * overwrite the setup from the bootloader (just 128b out of
 608          * our 16K), since we don't want to scramble the screen when
 609          * transitioning from the firmware's boot setup to runtime.
 610          */
 611         drm_mm_init(&hvs->dlist_mm,
 612                     HVS_BOOTLOADER_DLIST_END,
 613                     (SCALER_DLIST_SIZE >> 2) - HVS_BOOTLOADER_DLIST_END);
 614
 615         /* Set up the HVS LBM memory manager.  We could have some more
 616          * complicated data structure that allowed reuse of LBM areas
 617          * between planes when they don't overlap on the screen, but
 618          * for now we just allocate globally.
 619          */
 620         if (!hvs->hvs5)
 621                 /* 96kB */
 622                 drm_mm_init(&hvs->lbm_mm, 0, 96 * 1024);
 623         else
 624                 /* 70k words */
 625                 drm_mm_init(&hvs->lbm_mm, 0, 70 * 2 * 1024);
 626
 627         /* Upload filter kernels.  We only have the one for now, so we
 628          * keep it around for the lifetime of the driver.
 629          */
 630         ret = vc4_hvs_upload_linear_kernel(hvs,
 631                                            &hvs->mitchell_netravali_filter,
 632                                            mitchell_netravali_1_3_1_3_kernel);
 633         if (ret)
 634                 return ret;
 635
 636         vc4->hvs = hvs;
 637
 638         dispctrl = HVS_READ(SCALER_DISPCTRL);
 639
 640         dispctrl |= SCALER_DISPCTRL_ENABLE;
 641         dispctrl |= SCALER_DISPCTRL_DISPEIRQ(0) |
 642                     SCALER_DISPCTRL_DISPEIRQ(1) |
 643                     SCALER_DISPCTRL_DISPEIRQ(2);
 644
 645         /* Set DSP3 (PV1) to use HVS channel 2, which would otherwise
 646          * be unused.
 647          */
 648         dispctrl &= ~SCALER_DISPCTRL_DSP3_MUX_MASK;
 649         dispctrl &= ~(SCALER_DISPCTRL_DMAEIRQ |
 650                       SCALER_DISPCTRL_SLVWREIRQ |
 651                       SCALER_DISPCTRL_SLVRDEIRQ |
 652                       SCALER_DISPCTRL_DSPEIEOF(0) |
 653                       SCALER_DISPCTRL_DSPEIEOF(1) |
 654                       SCALER_DISPCTRL_DSPEIEOF(2) |
 655                       SCALER_DISPCTRL_DSPEIEOLN(0) |
 656                       SCALER_DISPCTRL_DSPEIEOLN(1) |
 657                       SCALER_DISPCTRL_DSPEIEOLN(2) |
 658                       SCALER_DISPCTRL_DSPEISLUR(0) |
 659                       SCALER_DISPCTRL_DSPEISLUR(1) |
 660                       SCALER_DISPCTRL_DSPEISLUR(2) |
 661                       SCALER_DISPCTRL_SCLEIRQ);
 662         dispctrl |= VC4_SET_FIELD(2, SCALER_DISPCTRL_DSP3_MUX);
 663
 664         HVS_WRITE(SCALER_DISPCTRL, dispctrl);
 665
 666         ret = devm_request_irq(dev, platform_get_irq(pdev, 0),
 667                                vc4_hvs_irq_handler, 0, "vc4 hvs", drm);
 668         if (ret)
 669                 return ret;
 670
 671         vc4_debugfs_add_regset32(drm, "hvs_regs", &hvs->regset);
 672         vc4_debugfs_add_file(drm, "hvs_underrun", vc4_hvs_debugfs_underrun,
 673                              NULL);
 674
 675         return 0;
 676 }
 677
 678 static void vc4_hvs_unbind(struct device *dev, struct device *master,
 679                            void *data)
 680 {
 681         struct drm_device *drm = dev_get_drvdata(master);
 682         struct vc4_dev *vc4 = to_vc4_dev(drm);
 683         struct vc4_hvs *hvs = vc4->hvs;
 684
 685         if (drm_mm_node_allocated(&vc4->hvs->mitchell_netravali_filter))
 686                 drm_mm_remove_node(&vc4->hvs->mitchell_netravali_filter);
 687
 688         drm_mm_takedown(&vc4->hvs->dlist_mm);
 689         drm_mm_takedown(&vc4->hvs->lbm_mm);
 690
 691         clk_disable_unprepare(hvs->core_clk);
 692
 693         vc4->hvs = NULL;
 694 }
 695
 696 static const struct component_ops vc4_hvs_ops = {
 697         .bind   = vc4_hvs_bind,
 698         .unbind = vc4_hvs_unbind,
 699 };
 700
 701 static int vc4_hvs_dev_probe(struct platform_device *pdev)
 702 {
 703         return component_add(&pdev->dev, &vc4_hvs_ops);
 704 }
 705
 706 static int vc4_hvs_dev_remove(struct platform_device *pdev)
 707 {
 708         component_del(&pdev->dev, &vc4_hvs_ops);
 709         return 0;
 710 }
 711
 712 static const struct of_device_id vc4_hvs_dt_match[] = {
 713         { .compatible = "brcm,bcm2711-hvs" },
 714         { .compatible = "brcm,bcm2835-hvs" },
 715         {}
 716 };
 717
 718 struct platform_driver vc4_hvs_driver = {
 719         .probe = vc4_hvs_dev_probe,
 720         .remove = vc4_hvs_dev_remove,
 721         .driver = {
 722                 .name = "vc4_hvs",
 723                 .of_match_table = vc4_hvs_dt_match,
 724         },
 725 };