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