drivers/gpu/drm/tidss/tidss_crtc.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * Copyright (C) 2018 Texas Instruments Incorporated - https://www.ti.com/
   4  * Author: Tomi Valkeinen <tomi.valkeinen@ti.com>
   5  */
   6
   7 #include <drm/drm_atomic.h>
   8 #include <drm/drm_atomic_helper.h>
   9 #include <drm/drm_crtc.h>
  10 #include <drm/drm_crtc_helper.h>
  11 #include <drm/drm_fb_cma_helper.h>
  12 #include <drm/drm_gem_cma_helper.h>
  13 #include <drm/drm_plane_helper.h>
  14 #include <drm/drm_vblank.h>
  15
  16 #include "tidss_crtc.h"
  17 #include "tidss_dispc.h"
  18 #include "tidss_drv.h"
  19 #include "tidss_irq.h"
  20 #include "tidss_plane.h"
  21
  22 /* Page flip and frame done IRQs */
  23
  24 static void tidss_crtc_finish_page_flip(struct tidss_crtc *tcrtc)
  25 {
  26         struct drm_device *ddev = tcrtc->crtc.dev;
  27         struct tidss_device *tidss = to_tidss(ddev);
  28         struct drm_pending_vblank_event *event;
  29         unsigned long flags;
  30         bool busy;
  31
  32         spin_lock_irqsave(&ddev->event_lock, flags);
  33
  34         /*
  35          * New settings are taken into use at VFP, and GO bit is cleared at
  36          * the same time. This happens before the vertical blank interrupt.
  37          * So there is a small change that the driver sets GO bit after VFP, but
  38          * before vblank, and we have to check for that case here.
  39          */
  40         busy = dispc_vp_go_busy(tidss->dispc, tcrtc->hw_videoport);
  41         if (busy) {
  42                 spin_unlock_irqrestore(&ddev->event_lock, flags);
  43                 return;
  44         }
  45
  46         event = tcrtc->event;
  47         tcrtc->event = NULL;
  48
  49         if (!event) {
  50                 spin_unlock_irqrestore(&ddev->event_lock, flags);
  51                 return;
  52         }
  53
  54         drm_crtc_send_vblank_event(&tcrtc->crtc, event);
  55
  56         spin_unlock_irqrestore(&ddev->event_lock, flags);
  57
  58         drm_crtc_vblank_put(&tcrtc->crtc);
  59 }
  60
  61 void tidss_crtc_vblank_irq(struct drm_crtc *crtc)
  62 {
  63         struct tidss_crtc *tcrtc = to_tidss_crtc(crtc);
  64
  65         drm_crtc_handle_vblank(crtc);
  66
  67         tidss_crtc_finish_page_flip(tcrtc);
  68 }
  69
  70 void tidss_crtc_framedone_irq(struct drm_crtc *crtc)
  71 {
  72         struct tidss_crtc *tcrtc = to_tidss_crtc(crtc);
  73
  74         complete(&tcrtc->framedone_completion);
  75 }
  76
  77 void tidss_crtc_error_irq(struct drm_crtc *crtc, u64 irqstatus)
  78 {
  79         struct tidss_crtc *tcrtc = to_tidss_crtc(crtc);
  80
  81         dev_err_ratelimited(crtc->dev->dev, "CRTC%u SYNC LOST: (irq %llx)\n",
  82                             tcrtc->hw_videoport, irqstatus);
  83 }
  84
  85 /* drm_crtc_helper_funcs */
  86
  87 static int tidss_crtc_atomic_check(struct drm_crtc *crtc,
  88                                    struct drm_atomic_state *state)
  89 {
  90         struct drm_crtc_state *crtc_state = drm_atomic_get_new_crtc_state(state,
  91                                                                           crtc);
  92         struct drm_device *ddev = crtc->dev;
  93         struct tidss_device *tidss = to_tidss(ddev);
  94         struct dispc_device *dispc = tidss->dispc;
  95         struct tidss_crtc *tcrtc = to_tidss_crtc(crtc);
  96         u32 hw_videoport = tcrtc->hw_videoport;
  97         const struct drm_display_mode *mode;
  98         enum drm_mode_status ok;
  99
 100         dev_dbg(ddev->dev, "%s\n", __func__);
 101
 102         if (!crtc_state->enable)
 103                 return 0;
 104
 105         mode = &crtc_state->adjusted_mode;
 106
 107         ok = dispc_vp_mode_valid(dispc, hw_videoport, mode);
 108         if (ok != MODE_OK) {
 109                 dev_dbg(ddev->dev, "%s: bad mode: %ux%u pclk %u kHz\n",
 110                         __func__, mode->hdisplay, mode->vdisplay, mode->clock);
 111                 return -EINVAL;
 112         }
 113
 114         return dispc_vp_bus_check(dispc, hw_videoport, crtc_state);
 115 }
 116
 117 /*
 118  * This needs all affected planes to be present in the atomic
 119  * state. The untouched planes are added to the state in
 120  * tidss_atomic_check().
 121  */
 122 static void tidss_crtc_position_planes(struct tidss_device *tidss,
 123                                        struct drm_crtc *crtc,
 124                                        struct drm_crtc_state *old_state,
 125                                        bool newmodeset)
 126 {
 127         struct drm_atomic_state *ostate = old_state->state;
 128         struct tidss_crtc *tcrtc = to_tidss_crtc(crtc);
 129         struct drm_crtc_state *cstate = crtc->state;
 130         int layer;
 131
 132         if (!newmodeset && !cstate->zpos_changed &&
 133             !to_tidss_crtc_state(cstate)->plane_pos_changed)
 134                 return;
 135
 136         for (layer = 0; layer < tidss->feat->num_planes; layer++) {
 137                 struct drm_plane_state *pstate;
 138                 struct drm_plane *plane;
 139                 bool layer_active = false;
 140                 int i;
 141
 142                 for_each_new_plane_in_state(ostate, plane, pstate, i) {
 143                         if (pstate->crtc != crtc || !pstate->visible)
 144                                 continue;
 145
 146                         if (pstate->normalized_zpos == layer) {
 147                                 layer_active = true;
 148                                 break;
 149                         }
 150                 }
 151
 152                 if (layer_active) {
 153                         struct tidss_plane *tplane = to_tidss_plane(plane);
 154
 155                         dispc_ovr_set_plane(tidss->dispc, tplane->hw_plane_id,
 156                                             tcrtc->hw_videoport,
 157                                             pstate->crtc_x, pstate->crtc_y,
 158                                             layer);
 159                 }
 160                 dispc_ovr_enable_layer(tidss->dispc, tcrtc->hw_videoport, layer,
 161                                        layer_active);
 162         }
 163 }
 164
 165 static void tidss_crtc_atomic_flush(struct drm_crtc *crtc,
 166                                     struct drm_atomic_state *state)
 167 {
 168         struct drm_crtc_state *old_crtc_state = drm_atomic_get_old_crtc_state(state,
 169                                                                               crtc);
 170         struct tidss_crtc *tcrtc = to_tidss_crtc(crtc);
 171         struct drm_device *ddev = crtc->dev;
 172         struct tidss_device *tidss = to_tidss(ddev);
 173         unsigned long flags;
 174
 175         dev_dbg(ddev->dev,
 176                 "%s: %s enabled %d, needs modeset %d, event %p\n", __func__,
 177                 crtc->name, drm_atomic_crtc_needs_modeset(crtc->state),
 178                 crtc->state->enable, crtc->state->event);
 179
 180         /* There is nothing to do if CRTC is not going to be enabled. */
 181         if (!crtc->state->enable)
 182                 return;
 183
 184         /*
 185          * Flush CRTC changes with go bit only if new modeset is not
 186          * coming, so CRTC is enabled trough out the commit.
 187          */
 188         if (drm_atomic_crtc_needs_modeset(crtc->state))
 189                 return;
 190
 191         /* If the GO bit is stuck we better quit here. */
 192         if (WARN_ON(dispc_vp_go_busy(tidss->dispc, tcrtc->hw_videoport)))
 193                 return;
 194
 195         /* We should have event if CRTC is enabled through out this commit. */
 196         if (WARN_ON(!crtc->state->event))
 197                 return;
 198
 199         /* Write vp properties to HW if needed. */
 200         dispc_vp_setup(tidss->dispc, tcrtc->hw_videoport, crtc->state, false);
 201
 202         /* Update plane positions if needed. */
 203         tidss_crtc_position_planes(tidss, crtc, old_crtc_state, false);
 204
 205         WARN_ON(drm_crtc_vblank_get(crtc) != 0);
 206
 207         spin_lock_irqsave(&ddev->event_lock, flags);
 208         dispc_vp_go(tidss->dispc, tcrtc->hw_videoport);
 209
 210         WARN_ON(tcrtc->event);
 211
 212         tcrtc->event = crtc->state->event;
 213         crtc->state->event = NULL;
 214
 215         spin_unlock_irqrestore(&ddev->event_lock, flags);
 216 }
 217
 218 static void tidss_crtc_atomic_enable(struct drm_crtc *crtc,
 219                                      struct drm_atomic_state *state)
 220 {
 221         struct drm_crtc_state *old_state = drm_atomic_get_old_crtc_state(state,
 222                                                                          crtc);
 223         struct tidss_crtc *tcrtc = to_tidss_crtc(crtc);
 224         struct drm_device *ddev = crtc->dev;
 225         struct tidss_device *tidss = to_tidss(ddev);
 226         const struct drm_display_mode *mode = &crtc->state->adjusted_mode;
 227         unsigned long flags;
 228         int r;
 229
 230         dev_dbg(ddev->dev, "%s, event %p\n", __func__, crtc->state->event);
 231
 232         tidss_runtime_get(tidss);
 233
 234         r = dispc_vp_set_clk_rate(tidss->dispc, tcrtc->hw_videoport,
 235                                   mode->clock * 1000);
 236         if (r != 0)
 237                 return;
 238
 239         r = dispc_vp_enable_clk(tidss->dispc, tcrtc->hw_videoport);
 240         if (r != 0)
 241                 return;
 242
 243         dispc_vp_setup(tidss->dispc, tcrtc->hw_videoport, crtc->state, true);
 244         tidss_crtc_position_planes(tidss, crtc, old_state, true);
 245
 246         /* Turn vertical blanking interrupt reporting on. */
 247         drm_crtc_vblank_on(crtc);
 248
 249         dispc_vp_prepare(tidss->dispc, tcrtc->hw_videoport, crtc->state);
 250
 251         dispc_vp_enable(tidss->dispc, tcrtc->hw_videoport, crtc->state);
 252
 253         spin_lock_irqsave(&ddev->event_lock, flags);
 254
 255         if (crtc->state->event) {
 256                 drm_crtc_send_vblank_event(crtc, crtc->state->event);
 257                 crtc->state->event = NULL;
 258         }
 259
 260         spin_unlock_irqrestore(&ddev->event_lock, flags);
 261 }
 262
 263 static void tidss_crtc_atomic_disable(struct drm_crtc *crtc,
 264                                       struct drm_atomic_state *state)
 265 {
 266         struct tidss_crtc *tcrtc = to_tidss_crtc(crtc);
 267         struct drm_device *ddev = crtc->dev;
 268         struct tidss_device *tidss = to_tidss(ddev);
 269         unsigned long flags;
 270
 271         dev_dbg(ddev->dev, "%s, event %p\n", __func__, crtc->state->event);
 272
 273         reinit_completion(&tcrtc->framedone_completion);
 274
 275         dispc_vp_disable(tidss->dispc, tcrtc->hw_videoport);
 276
 277         if (!wait_for_completion_timeout(&tcrtc->framedone_completion,
 278                                          msecs_to_jiffies(500)))
 279                 dev_err(tidss->dev, "Timeout waiting for framedone on crtc %d",
 280                         tcrtc->hw_videoport);
 281
 282         dispc_vp_unprepare(tidss->dispc, tcrtc->hw_videoport);
 283
 284         spin_lock_irqsave(&ddev->event_lock, flags);
 285         if (crtc->state->event) {
 286                 drm_crtc_send_vblank_event(crtc, crtc->state->event);
 287                 crtc->state->event = NULL;
 288         }
 289         spin_unlock_irqrestore(&ddev->event_lock, flags);
 290
 291         drm_crtc_vblank_off(crtc);
 292
 293         dispc_vp_disable_clk(tidss->dispc, tcrtc->hw_videoport);
 294
 295         tidss_runtime_put(tidss);
 296 }
 297
 298 static
 299 enum drm_mode_status tidss_crtc_mode_valid(struct drm_crtc *crtc,
 300                                            const struct drm_display_mode *mode)
 301 {
 302         struct tidss_crtc *tcrtc = to_tidss_crtc(crtc);
 303         struct drm_device *ddev = crtc->dev;
 304         struct tidss_device *tidss = to_tidss(ddev);
 305
 306         return dispc_vp_mode_valid(tidss->dispc, tcrtc->hw_videoport, mode);
 307 }
 308
 309 static const struct drm_crtc_helper_funcs tidss_crtc_helper_funcs = {
 310         .atomic_check = tidss_crtc_atomic_check,
 311         .atomic_flush = tidss_crtc_atomic_flush,
 312         .atomic_enable = tidss_crtc_atomic_enable,
 313         .atomic_disable = tidss_crtc_atomic_disable,
 314
 315         .mode_valid = tidss_crtc_mode_valid,
 316 };
 317
 318 /* drm_crtc_funcs */
 319
 320 static int tidss_crtc_enable_vblank(struct drm_crtc *crtc)
 321 {
 322         struct drm_device *ddev = crtc->dev;
 323         struct tidss_device *tidss = to_tidss(ddev);
 324
 325         dev_dbg(ddev->dev, "%s\n", __func__);
 326
 327         tidss_runtime_get(tidss);
 328
 329         tidss_irq_enable_vblank(crtc);
 330
 331         return 0;
 332 }
 333
 334 static void tidss_crtc_disable_vblank(struct drm_crtc *crtc)
 335 {
 336         struct drm_device *ddev = crtc->dev;
 337         struct tidss_device *tidss = to_tidss(ddev);
 338
 339         dev_dbg(ddev->dev, "%s\n", __func__);
 340
 341         tidss_irq_disable_vblank(crtc);
 342
 343         tidss_runtime_put(tidss);
 344 }
 345
 346 static void tidss_crtc_reset(struct drm_crtc *crtc)
 347 {
 348         struct tidss_crtc_state *tcrtc;
 349
 350         if (crtc->state)
 351                 __drm_atomic_helper_crtc_destroy_state(crtc->state);
 352
 353         kfree(crtc->state);
 354
 355         tcrtc = kzalloc(sizeof(*tcrtc), GFP_KERNEL);
 356         if (!tcrtc) {
 357                 crtc->state = NULL;
 358                 return;
 359         }
 360
 361         __drm_atomic_helper_crtc_reset(crtc, &tcrtc->base);
 362 }
 363
 364 static struct drm_crtc_state *tidss_crtc_duplicate_state(struct drm_crtc *crtc)
 365 {
 366         struct tidss_crtc_state *state, *current_state;
 367
 368         if (WARN_ON(!crtc->state))
 369                 return NULL;
 370
 371         current_state = to_tidss_crtc_state(crtc->state);
 372
 373         state = kmalloc(sizeof(*state), GFP_KERNEL);
 374         if (!state)
 375                 return NULL;
 376
 377         __drm_atomic_helper_crtc_duplicate_state(crtc, &state->base);
 378
 379         state->plane_pos_changed = false;
 380
 381         state->bus_format = current_state->bus_format;
 382         state->bus_flags = current_state->bus_flags;
 383
 384         return &state->base;
 385 }
 386
 387 static void tidss_crtc_destroy(struct drm_crtc *crtc)
 388 {
 389         struct tidss_crtc *tcrtc = to_tidss_crtc(crtc);
 390
 391         drm_crtc_cleanup(crtc);
 392         kfree(tcrtc);
 393 }
 394
 395 static const struct drm_crtc_funcs tidss_crtc_funcs = {
 396         .reset = tidss_crtc_reset,
 397         .destroy = tidss_crtc_destroy,
 398         .set_config = drm_atomic_helper_set_config,
 399         .page_flip = drm_atomic_helper_page_flip,
 400         .atomic_duplicate_state = tidss_crtc_duplicate_state,
 401         .atomic_destroy_state = drm_atomic_helper_crtc_destroy_state,
 402         .enable_vblank = tidss_crtc_enable_vblank,
 403         .disable_vblank = tidss_crtc_disable_vblank,
 404 };
 405
 406 struct tidss_crtc *tidss_crtc_create(struct tidss_device *tidss,
 407                                      u32 hw_videoport,
 408                                      struct drm_plane *primary)
 409 {
 410         struct tidss_crtc *tcrtc;
 411         struct drm_crtc *crtc;
 412         unsigned int gamma_lut_size = 0;
 413         bool has_ctm = tidss->feat->vp_feat.color.has_ctm;
 414         int ret;
 415
 416         tcrtc = kzalloc(sizeof(*tcrtc), GFP_KERNEL);
 417         if (!tcrtc)
 418                 return ERR_PTR(-ENOMEM);
 419
 420         tcrtc->hw_videoport = hw_videoport;
 421         init_completion(&tcrtc->framedone_completion);
 422
 423         crtc =  &tcrtc->crtc;
 424
 425         ret = drm_crtc_init_with_planes(&tidss->ddev, crtc, primary,
 426                                         NULL, &tidss_crtc_funcs, NULL);
 427         if (ret < 0) {
 428                 kfree(tcrtc);
 429                 return ERR_PTR(ret);
 430         }
 431
 432         drm_crtc_helper_add(crtc, &tidss_crtc_helper_funcs);
 433
 434         /*
 435          * The dispc gamma functions adapt to what ever size we ask
 436          * from it no matter what HW supports. X-server assumes 256
 437          * element gamma tables so lets use that.
 438          */
 439         if (tidss->feat->vp_feat.color.gamma_size)
 440                 gamma_lut_size = 256;
 441
 442         drm_crtc_enable_color_mgmt(crtc, 0, has_ctm, gamma_lut_size);
 443         if (gamma_lut_size)
 444                 drm_mode_crtc_set_gamma_size(crtc, gamma_lut_size);
 445
 446         return tcrtc;
 447 }