drivers/gpu/drm/tidss/tidss_crtc.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * Copyright (C) 2018 Texas Instruments Incorporated - http://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 = ddev->dev_private;
  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_crtc_state *state)
  89 {
  90         struct drm_device *ddev = crtc->dev;
  91         struct tidss_device *tidss = ddev->dev_private;
  92         struct dispc_device *dispc = tidss->dispc;
  93         struct tidss_crtc *tcrtc = to_tidss_crtc(crtc);
  94         u32 hw_videoport = tcrtc->hw_videoport;
  95         const struct drm_display_mode *mode;
  96         enum drm_mode_status ok;
  97
  98         dev_dbg(ddev->dev, "%s\n", __func__);
  99
 100         if (!state->enable)
 101                 return 0;
 102
 103         mode = &state->adjusted_mode;
 104
 105         ok = dispc_vp_mode_valid(dispc, hw_videoport, mode);
 106         if (ok != MODE_OK) {
 107                 dev_dbg(ddev->dev, "%s: bad mode: %ux%u pclk %u kHz\n",
 108                         __func__, mode->hdisplay, mode->vdisplay, mode->clock);
 109                 return -EINVAL;
 110         }
 111
 112         return dispc_vp_bus_check(dispc, hw_videoport, state);
 113 }
 114
 115 /*
 116  * This needs all affected planes to be present in the atomic
 117  * state. The untouched planes are added to the state in
 118  * tidss_atomic_check().
 119  */
 120 static void tidss_crtc_position_planes(struct tidss_device *tidss,
 121                                        struct drm_crtc *crtc,
 122                                        struct drm_crtc_state *old_state,
 123                                        bool newmodeset)
 124 {
 125         struct drm_atomic_state *ostate = old_state->state;
 126         struct tidss_crtc *tcrtc = to_tidss_crtc(crtc);
 127         struct drm_crtc_state *cstate = crtc->state;
 128         int layer;
 129
 130         if (!newmodeset && !cstate->zpos_changed &&
 131             !to_tidss_crtc_state(cstate)->plane_pos_changed)
 132                 return;
 133
 134         for (layer = 0; layer < tidss->feat->num_planes; layer++) {
 135                 struct drm_plane_state *pstate;
 136                 struct drm_plane *plane;
 137                 bool layer_active = false;
 138                 int i;
 139
 140                 for_each_new_plane_in_state(ostate, plane, pstate, i) {
 141                         if (pstate->crtc != crtc || !pstate->visible)
 142                                 continue;
 143
 144                         if (pstate->normalized_zpos == layer) {
 145                                 layer_active = true;
 146                                 break;
 147                         }
 148                 }
 149
 150                 if (layer_active) {
 151                         struct tidss_plane *tplane = to_tidss_plane(plane);
 152
 153                         dispc_ovr_set_plane(tidss->dispc, tplane->hw_plane_id,
 154                                             tcrtc->hw_videoport,
 155                                             pstate->crtc_x, pstate->crtc_y,
 156                                             layer);
 157                 }
 158                 dispc_ovr_enable_layer(tidss->dispc, tcrtc->hw_videoport, layer,
 159                                        layer_active);
 160         }
 161 }
 162
 163 static void tidss_crtc_atomic_flush(struct drm_crtc *crtc,
 164                                     struct drm_crtc_state *old_crtc_state)
 165 {
 166         struct tidss_crtc *tcrtc = to_tidss_crtc(crtc);
 167         struct drm_device *ddev = crtc->dev;
 168         struct tidss_device *tidss = ddev->dev_private;
 169         unsigned long flags;
 170
 171         dev_dbg(ddev->dev,
 172                 "%s: %s enabled %d, needs modeset %d, event %p\n", __func__,
 173                 crtc->name, drm_atomic_crtc_needs_modeset(crtc->state),
 174                 crtc->state->enable, crtc->state->event);
 175
 176         /* There is nothing to do if CRTC is not going to be enabled. */
 177         if (!crtc->state->enable)
 178                 return;
 179
 180         /*
 181          * Flush CRTC changes with go bit only if new modeset is not
 182          * coming, so CRTC is enabled trough out the commit.
 183          */
 184         if (drm_atomic_crtc_needs_modeset(crtc->state))
 185                 return;
 186
 187         /* If the GO bit is stuck we better quit here. */
 188         if (WARN_ON(dispc_vp_go_busy(tidss->dispc, tcrtc->hw_videoport)))
 189                 return;
 190
 191         /* We should have event if CRTC is enabled through out this commit. */
 192         if (WARN_ON(!crtc->state->event))
 193                 return;
 194
 195         /* Write vp properties to HW if needed. */
 196         dispc_vp_setup(tidss->dispc, tcrtc->hw_videoport, crtc->state, false);
 197
 198         /* Update plane positions if needed. */
 199         tidss_crtc_position_planes(tidss, crtc, old_crtc_state, false);
 200
 201         WARN_ON(drm_crtc_vblank_get(crtc) != 0);
 202
 203         spin_lock_irqsave(&ddev->event_lock, flags);
 204         dispc_vp_go(tidss->dispc, tcrtc->hw_videoport);
 205
 206         WARN_ON(tcrtc->event);
 207
 208         tcrtc->event = crtc->state->event;
 209         crtc->state->event = NULL;
 210
 211         spin_unlock_irqrestore(&ddev->event_lock, flags);
 212 }
 213
 214 static void tidss_crtc_atomic_enable(struct drm_crtc *crtc,
 215                                      struct drm_crtc_state *old_state)
 216 {
 217         struct tidss_crtc *tcrtc = to_tidss_crtc(crtc);
 218         struct drm_device *ddev = crtc->dev;
 219         struct tidss_device *tidss = ddev->dev_private;
 220         const struct drm_display_mode *mode = &crtc->state->adjusted_mode;
 221         unsigned long flags;
 222         int r;
 223
 224         dev_dbg(ddev->dev, "%s, event %p\n", __func__, crtc->state->event);
 225
 226         tidss_runtime_get(tidss);
 227
 228         r = dispc_vp_set_clk_rate(tidss->dispc, tcrtc->hw_videoport,
 229                                   mode->clock * 1000);
 230         if (r != 0)
 231                 return;
 232
 233         r = dispc_vp_enable_clk(tidss->dispc, tcrtc->hw_videoport);
 234         if (r != 0)
 235                 return;
 236
 237         dispc_vp_setup(tidss->dispc, tcrtc->hw_videoport, crtc->state, true);
 238         tidss_crtc_position_planes(tidss, crtc, old_state, true);
 239
 240         /* Turn vertical blanking interrupt reporting on. */
 241         drm_crtc_vblank_on(crtc);
 242
 243         dispc_vp_prepare(tidss->dispc, tcrtc->hw_videoport, crtc->state);
 244
 245         dispc_vp_enable(tidss->dispc, tcrtc->hw_videoport, crtc->state);
 246
 247         spin_lock_irqsave(&ddev->event_lock, flags);
 248
 249         if (crtc->state->event) {
 250                 drm_crtc_send_vblank_event(crtc, crtc->state->event);
 251                 crtc->state->event = NULL;
 252         }
 253
 254         spin_unlock_irqrestore(&ddev->event_lock, flags);
 255 }
 256
 257 static void tidss_crtc_atomic_disable(struct drm_crtc *crtc,
 258                                       struct drm_crtc_state *old_state)
 259 {
 260         struct tidss_crtc *tcrtc = to_tidss_crtc(crtc);
 261         struct drm_device *ddev = crtc->dev;
 262         struct tidss_device *tidss = ddev->dev_private;
 263         unsigned long flags;
 264
 265         dev_dbg(ddev->dev, "%s, event %p\n", __func__, crtc->state->event);
 266
 267         reinit_completion(&tcrtc->framedone_completion);
 268
 269         dispc_vp_disable(tidss->dispc, tcrtc->hw_videoport);
 270
 271         if (!wait_for_completion_timeout(&tcrtc->framedone_completion,
 272                                          msecs_to_jiffies(500)))
 273                 dev_err(tidss->dev, "Timeout waiting for framedone on crtc %d",
 274                         tcrtc->hw_videoport);
 275
 276         dispc_vp_unprepare(tidss->dispc, tcrtc->hw_videoport);
 277
 278         spin_lock_irqsave(&ddev->event_lock, flags);
 279         if (crtc->state->event) {
 280                 drm_crtc_send_vblank_event(crtc, crtc->state->event);
 281                 crtc->state->event = NULL;
 282         }
 283         spin_unlock_irqrestore(&ddev->event_lock, flags);
 284
 285         drm_crtc_vblank_off(crtc);
 286
 287         dispc_vp_disable_clk(tidss->dispc, tcrtc->hw_videoport);
 288
 289         tidss_runtime_put(tidss);
 290 }
 291
 292 static
 293 enum drm_mode_status tidss_crtc_mode_valid(struct drm_crtc *crtc,
 294                                            const struct drm_display_mode *mode)
 295 {
 296         struct tidss_crtc *tcrtc = to_tidss_crtc(crtc);
 297         struct drm_device *ddev = crtc->dev;
 298         struct tidss_device *tidss = ddev->dev_private;
 299
 300         return dispc_vp_mode_valid(tidss->dispc, tcrtc->hw_videoport, mode);
 301 }
 302
 303 static const struct drm_crtc_helper_funcs tidss_crtc_helper_funcs = {
 304         .atomic_check = tidss_crtc_atomic_check,
 305         .atomic_flush = tidss_crtc_atomic_flush,
 306         .atomic_enable = tidss_crtc_atomic_enable,
 307         .atomic_disable = tidss_crtc_atomic_disable,
 308
 309         .mode_valid = tidss_crtc_mode_valid,
 310 };
 311
 312 /* drm_crtc_funcs */
 313
 314 static int tidss_crtc_enable_vblank(struct drm_crtc *crtc)
 315 {
 316         struct drm_device *ddev = crtc->dev;
 317         struct tidss_device *tidss = ddev->dev_private;
 318
 319         dev_dbg(ddev->dev, "%s\n", __func__);
 320
 321         tidss_runtime_get(tidss);
 322
 323         tidss_irq_enable_vblank(crtc);
 324
 325         return 0;
 326 }
 327
 328 static void tidss_crtc_disable_vblank(struct drm_crtc *crtc)
 329 {
 330         struct drm_device *ddev = crtc->dev;
 331         struct tidss_device *tidss = ddev->dev_private;
 332
 333         dev_dbg(ddev->dev, "%s\n", __func__);
 334
 335         tidss_irq_disable_vblank(crtc);
 336
 337         tidss_runtime_put(tidss);
 338 }
 339
 340 static void tidss_crtc_reset(struct drm_crtc *crtc)
 341 {
 342         struct tidss_crtc_state *tcrtc;
 343
 344         if (crtc->state)
 345                 __drm_atomic_helper_crtc_destroy_state(crtc->state);
 346
 347         kfree(crtc->state);
 348
 349         tcrtc = kzalloc(sizeof(*tcrtc), GFP_KERNEL);
 350         if (!tcrtc) {
 351                 crtc->state = NULL;
 352                 return;
 353         }
 354
 355         crtc->state = &tcrtc->base;
 356         crtc->state->crtc = crtc;
 357 }
 358
 359 static struct drm_crtc_state *tidss_crtc_duplicate_state(struct drm_crtc *crtc)
 360 {
 361         struct tidss_crtc_state *state, *current_state;
 362
 363         if (WARN_ON(!crtc->state))
 364                 return NULL;
 365
 366         current_state = to_tidss_crtc_state(crtc->state);
 367
 368         state = kmalloc(sizeof(*state), GFP_KERNEL);
 369         if (!state)
 370                 return NULL;
 371
 372         __drm_atomic_helper_crtc_duplicate_state(crtc, &state->base);
 373
 374         state->plane_pos_changed = false;
 375
 376         state->bus_format = current_state->bus_format;
 377         state->bus_flags = current_state->bus_flags;
 378
 379         return &state->base;
 380 }
 381
 382 static void tidss_crtc_destroy(struct drm_crtc *crtc)
 383 {
 384         struct tidss_crtc *tcrtc = to_tidss_crtc(crtc);
 385
 386         drm_crtc_cleanup(crtc);
 387         kfree(tcrtc);
 388 }
 389
 390 static const struct drm_crtc_funcs tidss_crtc_funcs = {
 391         .reset = tidss_crtc_reset,
 392         .destroy = tidss_crtc_destroy,
 393         .set_config = drm_atomic_helper_set_config,
 394         .page_flip = drm_atomic_helper_page_flip,
 395         .atomic_duplicate_state = tidss_crtc_duplicate_state,
 396         .atomic_destroy_state = drm_atomic_helper_crtc_destroy_state,
 397         .enable_vblank = tidss_crtc_enable_vblank,
 398         .disable_vblank = tidss_crtc_disable_vblank,
 399 };
 400
 401 struct tidss_crtc *tidss_crtc_create(struct tidss_device *tidss,
 402                                      u32 hw_videoport,
 403                                      struct drm_plane *primary)
 404 {
 405         struct tidss_crtc *tcrtc;
 406         struct drm_crtc *crtc;
 407         unsigned int gamma_lut_size = 0;
 408         bool has_ctm = tidss->feat->vp_feat.color.has_ctm;
 409         int ret;
 410
 411         tcrtc = kzalloc(sizeof(*tcrtc), GFP_KERNEL);
 412         if (!tcrtc)
 413                 return ERR_PTR(-ENOMEM);
 414
 415         tcrtc->hw_videoport = hw_videoport;
 416         init_completion(&tcrtc->framedone_completion);
 417
 418         crtc =  &tcrtc->crtc;
 419
 420         ret = drm_crtc_init_with_planes(&tidss->ddev, crtc, primary,
 421                                         NULL, &tidss_crtc_funcs, NULL);
 422         if (ret < 0) {
 423                 kfree(tcrtc);
 424                 return ERR_PTR(ret);
 425         }
 426
 427         drm_crtc_helper_add(crtc, &tidss_crtc_helper_funcs);
 428
 429         /*
 430          * The dispc gamma functions adapt to what ever size we ask
 431          * from it no matter what HW supports. X-server assumes 256
 432          * element gamma tables so lets use that.
 433          */
 434         if (tidss->feat->vp_feat.color.gamma_size)
 435                 gamma_lut_size = 256;
 436
 437         drm_crtc_enable_color_mgmt(crtc, 0, has_ctm, gamma_lut_size);
 438         if (gamma_lut_size)
 439                 drm_mode_crtc_set_gamma_size(crtc, gamma_lut_size);
 440
 441         return tcrtc;
 442 }