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