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_crtc_state *old_crtc_state)
 167 {
 168         struct tidss_crtc *tcrtc = to_tidss_crtc(crtc);
 169         struct drm_device *ddev = crtc->dev;
 170         struct tidss_device *tidss = to_tidss(ddev);
 171         unsigned long flags;
 172
 173         dev_dbg(ddev->dev,
 174                 "%s: %s enabled %d, needs modeset %d, event %p\n", __func__,
 175                 crtc->name, drm_atomic_crtc_needs_modeset(crtc->state),
 176                 crtc->state->enable, crtc->state->event);
 177
 178         /* There is nothing to do if CRTC is not going to be enabled. */
 179         if (!crtc->state->enable)
 180                 return;
 181
 182         /*
 183          * Flush CRTC changes with go bit only if new modeset is not
 184          * coming, so CRTC is enabled trough out the commit.
 185          */
 186         if (drm_atomic_crtc_needs_modeset(crtc->state))
 187                 return;
 188
 189         /* If the GO bit is stuck we better quit here. */
 190         if (WARN_ON(dispc_vp_go_busy(tidss->dispc, tcrtc->hw_videoport)))
 191                 return;
 192
 193         /* We should have event if CRTC is enabled through out this commit. */
 194         if (WARN_ON(!crtc->state->event))
 195                 return;
 196
 197         /* Write vp properties to HW if needed. */
 198         dispc_vp_setup(tidss->dispc, tcrtc->hw_videoport, crtc->state, false);
 199
 200         /* Update plane positions if needed. */
 201         tidss_crtc_position_planes(tidss, crtc, old_crtc_state, false);
 202
 203         WARN_ON(drm_crtc_vblank_get(crtc) != 0);
 204
 205         spin_lock_irqsave(&ddev->event_lock, flags);
 206         dispc_vp_go(tidss->dispc, tcrtc->hw_videoport);
 207
 208         WARN_ON(tcrtc->event);
 209
 210         tcrtc->event = crtc->state->event;
 211         crtc->state->event = NULL;
 212
 213         spin_unlock_irqrestore(&ddev->event_lock, flags);
 214 }
 215
 216 static void tidss_crtc_atomic_enable(struct drm_crtc *crtc,
 217                                      struct drm_atomic_state *state)
 218 {
 219         struct drm_crtc_state *old_state = drm_atomic_get_old_crtc_state(state,
 220                                                                          crtc);
 221         struct tidss_crtc *tcrtc = to_tidss_crtc(crtc);
 222         struct drm_device *ddev = crtc->dev;
 223         struct tidss_device *tidss = to_tidss(ddev);
 224         const struct drm_display_mode *mode = &crtc->state->adjusted_mode;
 225         unsigned long flags;
 226         int r;
 227
 228         dev_dbg(ddev->dev, "%s, event %p\n", __func__, crtc->state->event);
 229
 230         tidss_runtime_get(tidss);
 231
 232         r = dispc_vp_set_clk_rate(tidss->dispc, tcrtc->hw_videoport,
 233                                   mode->clock * 1000);
 234         if (r != 0)
 235                 return;
 236
 237         r = dispc_vp_enable_clk(tidss->dispc, tcrtc->hw_videoport);
 238         if (r != 0)
 239                 return;
 240
 241         dispc_vp_setup(tidss->dispc, tcrtc->hw_videoport, crtc->state, true);
 242         tidss_crtc_position_planes(tidss, crtc, old_state, true);
 243
 244         /* Turn vertical blanking interrupt reporting on. */
 245         drm_crtc_vblank_on(crtc);
 246
 247         dispc_vp_prepare(tidss->dispc, tcrtc->hw_videoport, crtc->state);
 248
 249         dispc_vp_enable(tidss->dispc, tcrtc->hw_videoport, crtc->state);
 250
 251         spin_lock_irqsave(&ddev->event_lock, flags);
 252
 253         if (crtc->state->event) {
 254                 drm_crtc_send_vblank_event(crtc, crtc->state->event);
 255                 crtc->state->event = NULL;
 256         }
 257
 258         spin_unlock_irqrestore(&ddev->event_lock, flags);
 259 }
 260
 261 static void tidss_crtc_atomic_disable(struct drm_crtc *crtc,
 262                                       struct drm_atomic_state *state)
 263 {
 264         struct tidss_crtc *tcrtc = to_tidss_crtc(crtc);
 265         struct drm_device *ddev = crtc->dev;
 266         struct tidss_device *tidss = to_tidss(ddev);
 267         unsigned long flags;
 268
 269         dev_dbg(ddev->dev, "%s, event %p\n", __func__, crtc->state->event);
 270
 271         reinit_completion(&tcrtc->framedone_completion);
 272
 273         dispc_vp_disable(tidss->dispc, tcrtc->hw_videoport);
 274
 275         if (!wait_for_completion_timeout(&tcrtc->framedone_completion,
 276                                          msecs_to_jiffies(500)))
 277                 dev_err(tidss->dev, "Timeout waiting for framedone on crtc %d",
 278                         tcrtc->hw_videoport);
 279
 280         dispc_vp_unprepare(tidss->dispc, tcrtc->hw_videoport);
 281
 282         spin_lock_irqsave(&ddev->event_lock, flags);
 283         if (crtc->state->event) {
 284                 drm_crtc_send_vblank_event(crtc, crtc->state->event);
 285                 crtc->state->event = NULL;
 286         }
 287         spin_unlock_irqrestore(&ddev->event_lock, flags);
 288
 289         drm_crtc_vblank_off(crtc);
 290
 291         dispc_vp_disable_clk(tidss->dispc, tcrtc->hw_videoport);
 292
 293         tidss_runtime_put(tidss);
 294 }
 295
 296 static
 297 enum drm_mode_status tidss_crtc_mode_valid(struct drm_crtc *crtc,
 298                                            const struct drm_display_mode *mode)
 299 {
 300         struct tidss_crtc *tcrtc = to_tidss_crtc(crtc);
 301         struct drm_device *ddev = crtc->dev;
 302         struct tidss_device *tidss = to_tidss(ddev);
 303
 304         return dispc_vp_mode_valid(tidss->dispc, tcrtc->hw_videoport, mode);
 305 }
 306
 307 static const struct drm_crtc_helper_funcs tidss_crtc_helper_funcs = {
 308         .atomic_check = tidss_crtc_atomic_check,
 309         .atomic_flush = tidss_crtc_atomic_flush,
 310         .atomic_enable = tidss_crtc_atomic_enable,
 311         .atomic_disable = tidss_crtc_atomic_disable,
 312
 313         .mode_valid = tidss_crtc_mode_valid,
 314 };
 315
 316 /* drm_crtc_funcs */
 317
 318 static int tidss_crtc_enable_vblank(struct drm_crtc *crtc)
 319 {
 320         struct drm_device *ddev = crtc->dev;
 321         struct tidss_device *tidss = to_tidss(ddev);
 322
 323         dev_dbg(ddev->dev, "%s\n", __func__);
 324
 325         tidss_runtime_get(tidss);
 326
 327         tidss_irq_enable_vblank(crtc);
 328
 329         return 0;
 330 }
 331
 332 static void tidss_crtc_disable_vblank(struct drm_crtc *crtc)
 333 {
 334         struct drm_device *ddev = crtc->dev;
 335         struct tidss_device *tidss = to_tidss(ddev);
 336
 337         dev_dbg(ddev->dev, "%s\n", __func__);
 338
 339         tidss_irq_disable_vblank(crtc);
 340
 341         tidss_runtime_put(tidss);
 342 }
 343
 344 static void tidss_crtc_reset(struct drm_crtc *crtc)
 345 {
 346         struct tidss_crtc_state *tcrtc;
 347
 348         if (crtc->state)
 349                 __drm_atomic_helper_crtc_destroy_state(crtc->state);
 350
 351         kfree(crtc->state);
 352
 353         tcrtc = kzalloc(sizeof(*tcrtc), GFP_KERNEL);
 354         if (!tcrtc) {
 355                 crtc->state = NULL;
 356                 return;
 357         }
 358
 359         __drm_atomic_helper_crtc_reset(crtc, &tcrtc->base);
 360 }
 361
 362 static struct drm_crtc_state *tidss_crtc_duplicate_state(struct drm_crtc *crtc)
 363 {
 364         struct tidss_crtc_state *state, *current_state;
 365
 366         if (WARN_ON(!crtc->state))
 367                 return NULL;
 368
 369         current_state = to_tidss_crtc_state(crtc->state);
 370
 371         state = kmalloc(sizeof(*state), GFP_KERNEL);
 372         if (!state)
 373                 return NULL;
 374
 375         __drm_atomic_helper_crtc_duplicate_state(crtc, &state->base);
 376
 377         state->plane_pos_changed = false;
 378
 379         state->bus_format = current_state->bus_format;
 380         state->bus_flags = current_state->bus_flags;
 381
 382         return &state->base;
 383 }
 384
 385 static void tidss_crtc_destroy(struct drm_crtc *crtc)
 386 {
 387         struct tidss_crtc *tcrtc = to_tidss_crtc(crtc);
 388
 389         drm_crtc_cleanup(crtc);
 390         kfree(tcrtc);
 391 }
 392
 393 static const struct drm_crtc_funcs tidss_crtc_funcs = {
 394         .reset = tidss_crtc_reset,
 395         .destroy = tidss_crtc_destroy,
 396         .set_config = drm_atomic_helper_set_config,
 397         .page_flip = drm_atomic_helper_page_flip,
 398         .atomic_duplicate_state = tidss_crtc_duplicate_state,
 399         .atomic_destroy_state = drm_atomic_helper_crtc_destroy_state,
 400         .enable_vblank = tidss_crtc_enable_vblank,
 401         .disable_vblank = tidss_crtc_disable_vblank,
 402 };
 403
 404 struct tidss_crtc *tidss_crtc_create(struct tidss_device *tidss,
 405                                      u32 hw_videoport,
 406                                      struct drm_plane *primary)
 407 {
 408         struct tidss_crtc *tcrtc;
 409         struct drm_crtc *crtc;
 410         unsigned int gamma_lut_size = 0;
 411         bool has_ctm = tidss->feat->vp_feat.color.has_ctm;
 412         int ret;
 413
 414         tcrtc = kzalloc(sizeof(*tcrtc), GFP_KERNEL);
 415         if (!tcrtc)
 416                 return ERR_PTR(-ENOMEM);
 417
 418         tcrtc->hw_videoport = hw_videoport;
 419         init_completion(&tcrtc->framedone_completion);
 420
 421         crtc =  &tcrtc->crtc;
 422
 423         ret = drm_crtc_init_with_planes(&tidss->ddev, crtc, primary,
 424                                         NULL, &tidss_crtc_funcs, NULL);
 425         if (ret < 0) {
 426                 kfree(tcrtc);
 427                 return ERR_PTR(ret);
 428         }
 429
 430         drm_crtc_helper_add(crtc, &tidss_crtc_helper_funcs);
 431
 432         /*
 433          * The dispc gamma functions adapt to what ever size we ask
 434          * from it no matter what HW supports. X-server assumes 256
 435          * element gamma tables so lets use that.
 436          */
 437         if (tidss->feat->vp_feat.color.gamma_size)
 438                 gamma_lut_size = 256;
 439
 440         drm_crtc_enable_color_mgmt(crtc, 0, has_ctm, gamma_lut_size);
 441         if (gamma_lut_size)
 442                 drm_mode_crtc_set_gamma_size(crtc, gamma_lut_size);
 443
 444         return tcrtc;
 445 }