drivers/gpu/drm/imx/ipuv3-crtc.c

   1 /*
   2  * i.MX IPUv3 Graphics driver
   3  *
   4  * Copyright (C) 2011 Sascha Hauer, Pengutronix
   5  *
   6  * This program is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU General Public License
   8  * as published by the Free Software Foundation; either version 2
   9  * of the License, or (at your option) any later version.
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  * GNU General Public License for more details.
  14  */
  15 #include <linux/component.h>
  16 #include <linux/module.h>
  17 #include <linux/export.h>
  18 #include <linux/device.h>
  19 #include <linux/platform_device.h>
  20 #include <drm/drmP.h>
  21 #include <drm/drm_atomic.h>
  22 #include <drm/drm_atomic_helper.h>
  23 #include <drm/drm_crtc_helper.h>
  24 #include <linux/clk.h>
  25 #include <linux/errno.h>
  26 #include <drm/drm_gem_cma_helper.h>
  27 #include <drm/drm_fb_cma_helper.h>
  28
  29 #include <video/imx-ipu-v3.h>
  30 #include "imx-drm.h"
  31 #include "ipuv3-plane.h"
  32
  33 #define DRIVER_DESC             "i.MX IPUv3 Graphics"
  34
  35 struct ipu_crtc {
  36         struct device           *dev;
  37         struct drm_crtc         base;
  38         struct imx_drm_crtc     *imx_crtc;
  39
  40         /* plane[0] is the full plane, plane[1] is the partial plane */
  41         struct ipu_plane        *plane[2];
  42
  43         struct ipu_dc           *dc;
  44         struct ipu_di           *di;
  45         int                     irq;
  46 };
  47
  48 static inline struct ipu_crtc *to_ipu_crtc(struct drm_crtc *crtc)
  49 {
  50         return container_of(crtc, struct ipu_crtc, base);
  51 }
  52
  53 static void ipu_crtc_atomic_enable(struct drm_crtc *crtc,
  54                                    struct drm_crtc_state *old_state)
  55 {
  56         struct ipu_crtc *ipu_crtc = to_ipu_crtc(crtc);
  57         struct ipu_soc *ipu = dev_get_drvdata(ipu_crtc->dev->parent);
  58
  59         ipu_prg_enable(ipu);
  60         ipu_dc_enable(ipu);
  61         ipu_dc_enable_channel(ipu_crtc->dc);
  62         ipu_di_enable(ipu_crtc->di);
  63 }
  64
  65 static void ipu_crtc_disable_planes(struct ipu_crtc *ipu_crtc,
  66                                     struct drm_crtc_state *old_crtc_state)
  67 {
  68         bool disable_partial = false;
  69         bool disable_full = false;
  70         struct drm_plane *plane;
  71
  72         drm_atomic_crtc_state_for_each_plane(plane, old_crtc_state) {
  73                 if (plane == &ipu_crtc->plane[0]->base)
  74                         disable_full = true;
  75                 if (&ipu_crtc->plane[1] && plane == &ipu_crtc->plane[1]->base)
  76                         disable_partial = true;
  77         }
  78
  79         if (disable_partial)
  80                 ipu_plane_disable(ipu_crtc->plane[1], true);
  81         if (disable_full)
  82                 ipu_plane_disable(ipu_crtc->plane[0], false);
  83 }
  84
  85 static void ipu_crtc_atomic_disable(struct drm_crtc *crtc,
  86                                     struct drm_crtc_state *old_crtc_state)
  87 {
  88         struct ipu_crtc *ipu_crtc = to_ipu_crtc(crtc);
  89         struct ipu_soc *ipu = dev_get_drvdata(ipu_crtc->dev->parent);
  90
  91         ipu_dc_disable_channel(ipu_crtc->dc);
  92         ipu_di_disable(ipu_crtc->di);
  93         /*
  94          * Planes must be disabled before DC clock is removed, as otherwise the
  95          * attached IDMACs will be left in undefined state, possibly hanging
  96          * the IPU or even system.
  97          */
  98         ipu_crtc_disable_planes(ipu_crtc, old_crtc_state);
  99         ipu_dc_disable(ipu);
 100         ipu_prg_disable(ipu);
 101
 102         spin_lock_irq(&crtc->dev->event_lock);
 103         if (crtc->state->event) {
 104                 drm_crtc_send_vblank_event(crtc, crtc->state->event);
 105                 crtc->state->event = NULL;
 106         }
 107         spin_unlock_irq(&crtc->dev->event_lock);
 108
 109         drm_crtc_vblank_off(crtc);
 110 }
 111
 112 static void imx_drm_crtc_reset(struct drm_crtc *crtc)
 113 {
 114         struct imx_crtc_state *state;
 115
 116         if (crtc->state) {
 117                 if (crtc->state->mode_blob)
 118                         drm_property_unreference_blob(crtc->state->mode_blob);
 119
 120                 state = to_imx_crtc_state(crtc->state);
 121                 memset(state, 0, sizeof(*state));
 122         } else {
 123                 state = kzalloc(sizeof(*state), GFP_KERNEL);
 124                 if (!state)
 125                         return;
 126                 crtc->state = &state->base;
 127         }
 128
 129         state->base.crtc = crtc;
 130 }
 131
 132 static struct drm_crtc_state *imx_drm_crtc_duplicate_state(struct drm_crtc *crtc)
 133 {
 134         struct imx_crtc_state *state;
 135
 136         state = kzalloc(sizeof(*state), GFP_KERNEL);
 137         if (!state)
 138                 return NULL;
 139
 140         __drm_atomic_helper_crtc_duplicate_state(crtc, &state->base);
 141
 142         WARN_ON(state->base.crtc != crtc);
 143         state->base.crtc = crtc;
 144
 145         return &state->base;
 146 }
 147
 148 static void imx_drm_crtc_destroy_state(struct drm_crtc *crtc,
 149                                        struct drm_crtc_state *state)
 150 {
 151         __drm_atomic_helper_crtc_destroy_state(state);
 152         kfree(to_imx_crtc_state(state));
 153 }
 154
 155 static int ipu_enable_vblank(struct drm_crtc *crtc)
 156 {
 157         struct ipu_crtc *ipu_crtc = to_ipu_crtc(crtc);
 158
 159         enable_irq(ipu_crtc->irq);
 160
 161         return 0;
 162 }
 163
 164 static void ipu_disable_vblank(struct drm_crtc *crtc)
 165 {
 166         struct ipu_crtc *ipu_crtc = to_ipu_crtc(crtc);
 167
 168         disable_irq_nosync(ipu_crtc->irq);
 169 }
 170
 171 static const struct drm_crtc_funcs ipu_crtc_funcs = {
 172         .set_config = drm_atomic_helper_set_config,
 173         .destroy = drm_crtc_cleanup,
 174         .page_flip = drm_atomic_helper_page_flip,
 175         .reset = imx_drm_crtc_reset,
 176         .atomic_duplicate_state = imx_drm_crtc_duplicate_state,
 177         .atomic_destroy_state = imx_drm_crtc_destroy_state,
 178         .enable_vblank = ipu_enable_vblank,
 179         .disable_vblank = ipu_disable_vblank,
 180 };
 181
 182 static irqreturn_t ipu_irq_handler(int irq, void *dev_id)
 183 {
 184         struct ipu_crtc *ipu_crtc = dev_id;
 185
 186         drm_crtc_handle_vblank(&ipu_crtc->base);
 187
 188         return IRQ_HANDLED;
 189 }
 190
 191 static bool ipu_crtc_mode_fixup(struct drm_crtc *crtc,
 192                                   const struct drm_display_mode *mode,
 193                                   struct drm_display_mode *adjusted_mode)
 194 {
 195         struct ipu_crtc *ipu_crtc = to_ipu_crtc(crtc);
 196         struct videomode vm;
 197         int ret;
 198
 199         drm_display_mode_to_videomode(adjusted_mode, &vm);
 200
 201         ret = ipu_di_adjust_videomode(ipu_crtc->di, &vm);
 202         if (ret)
 203                 return false;
 204
 205         if ((vm.vsync_len == 0) || (vm.hsync_len == 0))
 206                 return false;
 207
 208         drm_display_mode_from_videomode(&vm, adjusted_mode);
 209
 210         return true;
 211 }
 212
 213 static int ipu_crtc_atomic_check(struct drm_crtc *crtc,
 214                                  struct drm_crtc_state *state)
 215 {
 216         u32 primary_plane_mask = 1 << drm_plane_index(crtc->primary);
 217
 218         if (state->active && (primary_plane_mask & state->plane_mask) == 0)
 219                 return -EINVAL;
 220
 221         return 0;
 222 }
 223
 224 static void ipu_crtc_atomic_begin(struct drm_crtc *crtc,
 225                                   struct drm_crtc_state *old_crtc_state)
 226 {
 227         drm_crtc_vblank_on(crtc);
 228
 229         spin_lock_irq(&crtc->dev->event_lock);
 230         if (crtc->state->event) {
 231                 WARN_ON(drm_crtc_vblank_get(crtc));
 232                 drm_crtc_arm_vblank_event(crtc, crtc->state->event);
 233                 crtc->state->event = NULL;
 234         }
 235         spin_unlock_irq(&crtc->dev->event_lock);
 236 }
 237
 238 static void ipu_crtc_mode_set_nofb(struct drm_crtc *crtc)
 239 {
 240         struct drm_device *dev = crtc->dev;
 241         struct drm_encoder *encoder;
 242         struct ipu_crtc *ipu_crtc = to_ipu_crtc(crtc);
 243         struct drm_display_mode *mode = &crtc->state->adjusted_mode;
 244         struct imx_crtc_state *imx_crtc_state = to_imx_crtc_state(crtc->state);
 245         struct ipu_di_signal_cfg sig_cfg = {};
 246         unsigned long encoder_types = 0;
 247
 248         dev_dbg(ipu_crtc->dev, "%s: mode->hdisplay: %d\n", __func__,
 249                         mode->hdisplay);
 250         dev_dbg(ipu_crtc->dev, "%s: mode->vdisplay: %d\n", __func__,
 251                         mode->vdisplay);
 252
 253         list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
 254                 if (encoder->crtc == crtc)
 255                         encoder_types |= BIT(encoder->encoder_type);
 256         }
 257
 258         dev_dbg(ipu_crtc->dev, "%s: attached to encoder types 0x%lx\n",
 259                 __func__, encoder_types);
 260
 261         /*
 262          * If we have DAC or LDB, then we need the IPU DI clock to be
 263          * the same as the LDB DI clock. For TVDAC, derive the IPU DI
 264          * clock from 27 MHz TVE_DI clock, but allow to divide it.
 265          */
 266         if (encoder_types & (BIT(DRM_MODE_ENCODER_DAC) |
 267                              BIT(DRM_MODE_ENCODER_LVDS)))
 268                 sig_cfg.clkflags = IPU_DI_CLKMODE_SYNC | IPU_DI_CLKMODE_EXT;
 269         else if (encoder_types & BIT(DRM_MODE_ENCODER_TVDAC))
 270                 sig_cfg.clkflags = IPU_DI_CLKMODE_EXT;
 271         else
 272                 sig_cfg.clkflags = 0;
 273
 274         sig_cfg.enable_pol = !(imx_crtc_state->bus_flags & DRM_BUS_FLAG_DE_LOW);
 275         /* Default to driving pixel data on negative clock edges */
 276         sig_cfg.clk_pol = !!(imx_crtc_state->bus_flags &
 277                              DRM_BUS_FLAG_PIXDATA_POSEDGE);
 278         sig_cfg.bus_format = imx_crtc_state->bus_format;
 279         sig_cfg.v_to_h_sync = 0;
 280         sig_cfg.hsync_pin = imx_crtc_state->di_hsync_pin;
 281         sig_cfg.vsync_pin = imx_crtc_state->di_vsync_pin;
 282
 283         drm_display_mode_to_videomode(mode, &sig_cfg.mode);
 284
 285         ipu_dc_init_sync(ipu_crtc->dc, ipu_crtc->di,
 286                          mode->flags & DRM_MODE_FLAG_INTERLACE,
 287                          imx_crtc_state->bus_format, mode->hdisplay);
 288         ipu_di_init_sync_panel(ipu_crtc->di, &sig_cfg);
 289 }
 290
 291 static const struct drm_crtc_helper_funcs ipu_helper_funcs = {
 292         .mode_fixup = ipu_crtc_mode_fixup,
 293         .mode_set_nofb = ipu_crtc_mode_set_nofb,
 294         .atomic_check = ipu_crtc_atomic_check,
 295         .atomic_begin = ipu_crtc_atomic_begin,
 296         .atomic_disable = ipu_crtc_atomic_disable,
 297         .atomic_enable = ipu_crtc_atomic_enable,
 298 };
 299
 300 static void ipu_put_resources(struct ipu_crtc *ipu_crtc)
 301 {
 302         if (!IS_ERR_OR_NULL(ipu_crtc->dc))
 303                 ipu_dc_put(ipu_crtc->dc);
 304         if (!IS_ERR_OR_NULL(ipu_crtc->di))
 305                 ipu_di_put(ipu_crtc->di);
 306 }
 307
 308 static int ipu_get_resources(struct ipu_crtc *ipu_crtc,
 309                 struct ipu_client_platformdata *pdata)
 310 {
 311         struct ipu_soc *ipu = dev_get_drvdata(ipu_crtc->dev->parent);
 312         int ret;
 313
 314         ipu_crtc->dc = ipu_dc_get(ipu, pdata->dc);
 315         if (IS_ERR(ipu_crtc->dc)) {
 316                 ret = PTR_ERR(ipu_crtc->dc);
 317                 goto err_out;
 318         }
 319
 320         ipu_crtc->di = ipu_di_get(ipu, pdata->di);
 321         if (IS_ERR(ipu_crtc->di)) {
 322                 ret = PTR_ERR(ipu_crtc->di);
 323                 goto err_out;
 324         }
 325
 326         return 0;
 327 err_out:
 328         ipu_put_resources(ipu_crtc);
 329
 330         return ret;
 331 }
 332
 333 static int ipu_crtc_init(struct ipu_crtc *ipu_crtc,
 334         struct ipu_client_platformdata *pdata, struct drm_device *drm)
 335 {
 336         struct ipu_soc *ipu = dev_get_drvdata(ipu_crtc->dev->parent);
 337         struct drm_crtc *crtc = &ipu_crtc->base;
 338         int dp = -EINVAL;
 339         int ret;
 340
 341         ret = ipu_get_resources(ipu_crtc, pdata);
 342         if (ret) {
 343                 dev_err(ipu_crtc->dev, "getting resources failed with %d.\n",
 344                                 ret);
 345                 return ret;
 346         }
 347
 348         if (pdata->dp >= 0)
 349                 dp = IPU_DP_FLOW_SYNC_BG;
 350         ipu_crtc->plane[0] = ipu_plane_init(drm, ipu, pdata->dma[0], dp, 0,
 351                                             DRM_PLANE_TYPE_PRIMARY);
 352         if (IS_ERR(ipu_crtc->plane[0])) {
 353                 ret = PTR_ERR(ipu_crtc->plane[0]);
 354                 goto err_put_resources;
 355         }
 356
 357         crtc->port = pdata->of_node;
 358         drm_crtc_helper_add(crtc, &ipu_helper_funcs);
 359         drm_crtc_init_with_planes(drm, crtc, &ipu_crtc->plane[0]->base, NULL,
 360                                   &ipu_crtc_funcs, NULL);
 361
 362         ret = ipu_plane_get_resources(ipu_crtc->plane[0]);
 363         if (ret) {
 364                 dev_err(ipu_crtc->dev, "getting plane 0 resources failed with %d.\n",
 365                         ret);
 366                 goto err_put_resources;
 367         }
 368
 369         /* If this crtc is using the DP, add an overlay plane */
 370         if (pdata->dp >= 0 && pdata->dma[1] > 0) {
 371                 ipu_crtc->plane[1] = ipu_plane_init(drm, ipu, pdata->dma[1],
 372                                                 IPU_DP_FLOW_SYNC_FG,
 373                                                 drm_crtc_mask(&ipu_crtc->base),
 374                                                 DRM_PLANE_TYPE_OVERLAY);
 375                 if (IS_ERR(ipu_crtc->plane[1])) {
 376                         ipu_crtc->plane[1] = NULL;
 377                 } else {
 378                         ret = ipu_plane_get_resources(ipu_crtc->plane[1]);
 379                         if (ret) {
 380                                 dev_err(ipu_crtc->dev, "getting plane 1 "
 381                                         "resources failed with %d.\n", ret);
 382                                 goto err_put_plane0_res;
 383                         }
 384                 }
 385         }
 386
 387         ipu_crtc->irq = ipu_plane_irq(ipu_crtc->plane[0]);
 388         ret = devm_request_irq(ipu_crtc->dev, ipu_crtc->irq, ipu_irq_handler, 0,
 389                         "imx_drm", ipu_crtc);
 390         if (ret < 0) {
 391                 dev_err(ipu_crtc->dev, "irq request failed with %d.\n", ret);
 392                 goto err_put_plane1_res;
 393         }
 394         /* Only enable IRQ when we actually need it to trigger work. */
 395         disable_irq(ipu_crtc->irq);
 396
 397         return 0;
 398
 399 err_put_plane1_res:
 400         if (ipu_crtc->plane[1])
 401                 ipu_plane_put_resources(ipu_crtc->plane[1]);
 402 err_put_plane0_res:
 403         ipu_plane_put_resources(ipu_crtc->plane[0]);
 404 err_put_resources:
 405         ipu_put_resources(ipu_crtc);
 406
 407         return ret;
 408 }
 409
 410 static int ipu_drm_bind(struct device *dev, struct device *master, void *data)
 411 {
 412         struct ipu_client_platformdata *pdata = dev->platform_data;
 413         struct drm_device *drm = data;
 414         struct ipu_crtc *ipu_crtc;
 415         int ret;
 416
 417         ipu_crtc = devm_kzalloc(dev, sizeof(*ipu_crtc), GFP_KERNEL);
 418         if (!ipu_crtc)
 419                 return -ENOMEM;
 420
 421         ipu_crtc->dev = dev;
 422
 423         ret = ipu_crtc_init(ipu_crtc, pdata, drm);
 424         if (ret)
 425                 return ret;
 426
 427         dev_set_drvdata(dev, ipu_crtc);
 428
 429         return 0;
 430 }
 431
 432 static void ipu_drm_unbind(struct device *dev, struct device *master,
 433         void *data)
 434 {
 435         struct ipu_crtc *ipu_crtc = dev_get_drvdata(dev);
 436
 437         ipu_put_resources(ipu_crtc);
 438         if (ipu_crtc->plane[1])
 439                 ipu_plane_put_resources(ipu_crtc->plane[1]);
 440         ipu_plane_put_resources(ipu_crtc->plane[0]);
 441 }
 442
 443 static const struct component_ops ipu_crtc_ops = {
 444         .bind = ipu_drm_bind,
 445         .unbind = ipu_drm_unbind,
 446 };
 447
 448 static int ipu_drm_probe(struct platform_device *pdev)
 449 {
 450         struct device *dev = &pdev->dev;
 451         int ret;
 452
 453         if (!dev->platform_data)
 454                 return -EINVAL;
 455
 456         ret = dma_set_coherent_mask(dev, DMA_BIT_MASK(32));
 457         if (ret)
 458                 return ret;
 459
 460         return component_add(dev, &ipu_crtc_ops);
 461 }
 462
 463 static int ipu_drm_remove(struct platform_device *pdev)
 464 {
 465         component_del(&pdev->dev, &ipu_crtc_ops);
 466         return 0;
 467 }
 468
 469 struct platform_driver ipu_drm_driver = {
 470         .driver = {
 471                 .name = "imx-ipuv3-crtc",
 472         },
 473         .probe = ipu_drm_probe,
 474         .remove = ipu_drm_remove,
 475 };