kernel/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_crtc_helper.h>
  22 #include <linux/fb.h>
  23 #include <linux/clk.h>
  24 #include <linux/errno.h>
  25 #include <drm/drm_gem_cma_helper.h>
  26 #include <drm/drm_fb_cma_helper.h>
  27
  28 #include <video/imx-ipu-v3.h>
  29 #include "imx-drm.h"
  30 #include "ipuv3-plane.h"
  31
  32 #define DRIVER_DESC             "i.MX IPUv3 Graphics"
  33
  34 struct ipu_crtc {
  35         struct device           *dev;
  36         struct drm_crtc         base;
  37         struct imx_drm_crtc     *imx_crtc;
  38
  39         /* plane[0] is the full plane, plane[1] is the partial plane */
  40         struct ipu_plane        *plane[2];
  41
  42         struct ipu_dc           *dc;
  43         struct ipu_di           *di;
  44         int                     enabled;
  45         struct drm_pending_vblank_event *page_flip_event;
  46         struct drm_framebuffer  *newfb;
  47         int                     irq;
  48         u32                     bus_format;
  49         int                     di_hsync_pin;
  50         int                     di_vsync_pin;
  51 };
  52
  53 #define to_ipu_crtc(x) container_of(x, struct ipu_crtc, base)
  54
  55 static void ipu_fb_enable(struct ipu_crtc *ipu_crtc)
  56 {
  57         struct ipu_soc *ipu = dev_get_drvdata(ipu_crtc->dev->parent);
  58
  59         if (ipu_crtc->enabled)
  60                 return;
  61
  62         ipu_dc_enable(ipu);
  63         ipu_plane_enable(ipu_crtc->plane[0]);
  64         /* Start DC channel and DI after IDMAC */
  65         ipu_dc_enable_channel(ipu_crtc->dc);
  66         ipu_di_enable(ipu_crtc->di);
  67
  68         ipu_crtc->enabled = 1;
  69 }
  70
  71 static void ipu_fb_disable(struct ipu_crtc *ipu_crtc)
  72 {
  73         struct ipu_soc *ipu = dev_get_drvdata(ipu_crtc->dev->parent);
  74
  75         if (!ipu_crtc->enabled)
  76                 return;
  77
  78         /* Stop DC channel and DI before IDMAC */
  79         ipu_dc_disable_channel(ipu_crtc->dc);
  80         ipu_di_disable(ipu_crtc->di);
  81         ipu_plane_disable(ipu_crtc->plane[0]);
  82         ipu_dc_disable(ipu);
  83
  84         ipu_crtc->enabled = 0;
  85 }
  86
  87 static void ipu_crtc_dpms(struct drm_crtc *crtc, int mode)
  88 {
  89         struct ipu_crtc *ipu_crtc = to_ipu_crtc(crtc);
  90
  91         dev_dbg(ipu_crtc->dev, "%s mode: %d\n", __func__, mode);
  92
  93         switch (mode) {
  94         case DRM_MODE_DPMS_ON:
  95                 ipu_fb_enable(ipu_crtc);
  96                 break;
  97         case DRM_MODE_DPMS_STANDBY:
  98         case DRM_MODE_DPMS_SUSPEND:
  99         case DRM_MODE_DPMS_OFF:
 100                 ipu_fb_disable(ipu_crtc);
 101                 break;
 102         }
 103 }
 104
 105 static int ipu_page_flip(struct drm_crtc *crtc,
 106                 struct drm_framebuffer *fb,
 107                 struct drm_pending_vblank_event *event,
 108                 uint32_t page_flip_flags)
 109 {
 110         struct ipu_crtc *ipu_crtc = to_ipu_crtc(crtc);
 111         int ret;
 112
 113         if (ipu_crtc->newfb)
 114                 return -EBUSY;
 115
 116         ret = imx_drm_crtc_vblank_get(ipu_crtc->imx_crtc);
 117         if (ret) {
 118                 dev_dbg(ipu_crtc->dev, "failed to acquire vblank counter\n");
 119                 list_del(&event->base.link);
 120
 121                 return ret;
 122         }
 123
 124         ipu_crtc->newfb = fb;
 125         ipu_crtc->page_flip_event = event;
 126         crtc->primary->fb = fb;
 127
 128         return 0;
 129 }
 130
 131 static const struct drm_crtc_funcs ipu_crtc_funcs = {
 132         .set_config = drm_crtc_helper_set_config,
 133         .destroy = drm_crtc_cleanup,
 134         .page_flip = ipu_page_flip,
 135 };
 136
 137 static int ipu_crtc_mode_set(struct drm_crtc *crtc,
 138                                struct drm_display_mode *orig_mode,
 139                                struct drm_display_mode *mode,
 140                                int x, int y,
 141                                struct drm_framebuffer *old_fb)
 142 {
 143         struct drm_device *dev = crtc->dev;
 144         struct drm_encoder *encoder;
 145         struct ipu_crtc *ipu_crtc = to_ipu_crtc(crtc);
 146         struct ipu_di_signal_cfg sig_cfg = {};
 147         unsigned long encoder_types = 0;
 148         int ret;
 149
 150         dev_dbg(ipu_crtc->dev, "%s: mode->hdisplay: %d\n", __func__,
 151                         mode->hdisplay);
 152         dev_dbg(ipu_crtc->dev, "%s: mode->vdisplay: %d\n", __func__,
 153                         mode->vdisplay);
 154
 155         list_for_each_entry(encoder, &dev->mode_config.encoder_list, head)
 156                 if (encoder->crtc == crtc)
 157                         encoder_types |= BIT(encoder->encoder_type);
 158
 159         dev_dbg(ipu_crtc->dev, "%s: attached to encoder types 0x%lx\n",
 160                 __func__, encoder_types);
 161
 162         /*
 163          * If we have DAC or LDB, then we need the IPU DI clock to be
 164          * the same as the LDB DI clock. For TVDAC, derive the IPU DI
 165          * clock from 27 MHz TVE_DI clock, but allow to divide it.
 166          */
 167         if (encoder_types & (BIT(DRM_MODE_ENCODER_DAC) |
 168                              BIT(DRM_MODE_ENCODER_LVDS)))
 169                 sig_cfg.clkflags = IPU_DI_CLKMODE_SYNC | IPU_DI_CLKMODE_EXT;
 170         else if (encoder_types & BIT(DRM_MODE_ENCODER_TVDAC))
 171                 sig_cfg.clkflags = IPU_DI_CLKMODE_EXT;
 172         else
 173                 sig_cfg.clkflags = 0;
 174
 175         sig_cfg.enable_pol = 1;
 176         sig_cfg.clk_pol = 0;
 177         sig_cfg.bus_format = ipu_crtc->bus_format;
 178         sig_cfg.v_to_h_sync = 0;
 179         sig_cfg.hsync_pin = ipu_crtc->di_hsync_pin;
 180         sig_cfg.vsync_pin = ipu_crtc->di_vsync_pin;
 181
 182         drm_display_mode_to_videomode(mode, &sig_cfg.mode);
 183
 184         ret = ipu_dc_init_sync(ipu_crtc->dc, ipu_crtc->di,
 185                                mode->flags & DRM_MODE_FLAG_INTERLACE,
 186                                ipu_crtc->bus_format, mode->hdisplay);
 187         if (ret) {
 188                 dev_err(ipu_crtc->dev,
 189                                 "initializing display controller failed with %d\n",
 190                                 ret);
 191                 return ret;
 192         }
 193
 194         ret = ipu_di_init_sync_panel(ipu_crtc->di, &sig_cfg);
 195         if (ret) {
 196                 dev_err(ipu_crtc->dev,
 197                                 "initializing panel failed with %d\n", ret);
 198                 return ret;
 199         }
 200
 201         return ipu_plane_mode_set(ipu_crtc->plane[0], crtc, mode,
 202                                   crtc->primary->fb,
 203                                   0, 0, mode->hdisplay, mode->vdisplay,
 204                                   x, y, mode->hdisplay, mode->vdisplay,
 205                                   mode->flags & DRM_MODE_FLAG_INTERLACE);
 206 }
 207
 208 static void ipu_crtc_handle_pageflip(struct ipu_crtc *ipu_crtc)
 209 {
 210         unsigned long flags;
 211         struct drm_device *drm = ipu_crtc->base.dev;
 212
 213         spin_lock_irqsave(&drm->event_lock, flags);
 214         if (ipu_crtc->page_flip_event)
 215                 drm_send_vblank_event(drm, -1, ipu_crtc->page_flip_event);
 216         ipu_crtc->page_flip_event = NULL;
 217         imx_drm_crtc_vblank_put(ipu_crtc->imx_crtc);
 218         spin_unlock_irqrestore(&drm->event_lock, flags);
 219 }
 220
 221 static irqreturn_t ipu_irq_handler(int irq, void *dev_id)
 222 {
 223         struct ipu_crtc *ipu_crtc = dev_id;
 224
 225         imx_drm_handle_vblank(ipu_crtc->imx_crtc);
 226
 227         if (ipu_crtc->newfb) {
 228                 struct ipu_plane *plane = ipu_crtc->plane[0];
 229
 230                 ipu_crtc->newfb = NULL;
 231                 ipu_plane_set_base(plane, ipu_crtc->base.primary->fb,
 232                                    plane->x, plane->y);
 233                 ipu_crtc_handle_pageflip(ipu_crtc);
 234         }
 235
 236         return IRQ_HANDLED;
 237 }
 238
 239 static bool ipu_crtc_mode_fixup(struct drm_crtc *crtc,
 240                                   const struct drm_display_mode *mode,
 241                                   struct drm_display_mode *adjusted_mode)
 242 {
 243         struct ipu_crtc *ipu_crtc = to_ipu_crtc(crtc);
 244         struct videomode vm;
 245         int ret;
 246
 247         drm_display_mode_to_videomode(adjusted_mode, &vm);
 248
 249         ret = ipu_di_adjust_videomode(ipu_crtc->di, &vm);
 250         if (ret)
 251                 return false;
 252
 253         drm_display_mode_from_videomode(&vm, adjusted_mode);
 254
 255         return true;
 256 }
 257
 258 static void ipu_crtc_prepare(struct drm_crtc *crtc)
 259 {
 260         struct ipu_crtc *ipu_crtc = to_ipu_crtc(crtc);
 261
 262         ipu_fb_disable(ipu_crtc);
 263 }
 264
 265 static void ipu_crtc_commit(struct drm_crtc *crtc)
 266 {
 267         struct ipu_crtc *ipu_crtc = to_ipu_crtc(crtc);
 268
 269         ipu_fb_enable(ipu_crtc);
 270 }
 271
 272 static struct drm_crtc_helper_funcs ipu_helper_funcs = {
 273         .dpms = ipu_crtc_dpms,
 274         .mode_fixup = ipu_crtc_mode_fixup,
 275         .mode_set = ipu_crtc_mode_set,
 276         .prepare = ipu_crtc_prepare,
 277         .commit = ipu_crtc_commit,
 278 };
 279
 280 static int ipu_enable_vblank(struct drm_crtc *crtc)
 281 {
 282         return 0;
 283 }
 284
 285 static void ipu_disable_vblank(struct drm_crtc *crtc)
 286 {
 287         struct ipu_crtc *ipu_crtc = to_ipu_crtc(crtc);
 288
 289         ipu_crtc->page_flip_event = NULL;
 290         ipu_crtc->newfb = NULL;
 291 }
 292
 293 static int ipu_set_interface_pix_fmt(struct drm_crtc *crtc,
 294                 u32 bus_format, int hsync_pin, int vsync_pin)
 295 {
 296         struct ipu_crtc *ipu_crtc = to_ipu_crtc(crtc);
 297
 298         ipu_crtc->bus_format = bus_format;
 299         ipu_crtc->di_hsync_pin = hsync_pin;
 300         ipu_crtc->di_vsync_pin = vsync_pin;
 301
 302         return 0;
 303 }
 304
 305 static const struct imx_drm_crtc_helper_funcs ipu_crtc_helper_funcs = {
 306         .enable_vblank = ipu_enable_vblank,
 307         .disable_vblank = ipu_disable_vblank,
 308         .set_interface_pix_fmt = ipu_set_interface_pix_fmt,
 309         .crtc_funcs = &ipu_crtc_funcs,
 310         .crtc_helper_funcs = &ipu_helper_funcs,
 311 };
 312
 313 static void ipu_put_resources(struct ipu_crtc *ipu_crtc)
 314 {
 315         if (!IS_ERR_OR_NULL(ipu_crtc->dc))
 316                 ipu_dc_put(ipu_crtc->dc);
 317         if (!IS_ERR_OR_NULL(ipu_crtc->di))
 318                 ipu_di_put(ipu_crtc->di);
 319 }
 320
 321 static int ipu_get_resources(struct ipu_crtc *ipu_crtc,
 322                 struct ipu_client_platformdata *pdata)
 323 {
 324         struct ipu_soc *ipu = dev_get_drvdata(ipu_crtc->dev->parent);
 325         int ret;
 326
 327         ipu_crtc->dc = ipu_dc_get(ipu, pdata->dc);
 328         if (IS_ERR(ipu_crtc->dc)) {
 329                 ret = PTR_ERR(ipu_crtc->dc);
 330                 goto err_out;
 331         }
 332
 333         ipu_crtc->di = ipu_di_get(ipu, pdata->di);
 334         if (IS_ERR(ipu_crtc->di)) {
 335                 ret = PTR_ERR(ipu_crtc->di);
 336                 goto err_out;
 337         }
 338
 339         return 0;
 340 err_out:
 341         ipu_put_resources(ipu_crtc);
 342
 343         return ret;
 344 }
 345
 346 static int ipu_crtc_init(struct ipu_crtc *ipu_crtc,
 347         struct ipu_client_platformdata *pdata, struct drm_device *drm)
 348 {
 349         struct ipu_soc *ipu = dev_get_drvdata(ipu_crtc->dev->parent);
 350         int dp = -EINVAL;
 351         int ret;
 352         int id;
 353
 354         ret = ipu_get_resources(ipu_crtc, pdata);
 355         if (ret) {
 356                 dev_err(ipu_crtc->dev, "getting resources failed with %d.\n",
 357                                 ret);
 358                 return ret;
 359         }
 360
 361         ret = imx_drm_add_crtc(drm, &ipu_crtc->base, &ipu_crtc->imx_crtc,
 362                         &ipu_crtc_helper_funcs, ipu_crtc->dev->of_node);
 363         if (ret) {
 364                 dev_err(ipu_crtc->dev, "adding crtc failed with %d.\n", ret);
 365                 goto err_put_resources;
 366         }
 367
 368         if (pdata->dp >= 0)
 369                 dp = IPU_DP_FLOW_SYNC_BG;
 370         id = imx_drm_crtc_id(ipu_crtc->imx_crtc);
 371         ipu_crtc->plane[0] = ipu_plane_init(ipu_crtc->base.dev, ipu,
 372                                             pdata->dma[0], dp, BIT(id), true);
 373         ret = ipu_plane_get_resources(ipu_crtc->plane[0]);
 374         if (ret) {
 375                 dev_err(ipu_crtc->dev, "getting plane 0 resources failed with %d.\n",
 376                         ret);
 377                 goto err_remove_crtc;
 378         }
 379
 380         /* If this crtc is using the DP, add an overlay plane */
 381         if (pdata->dp >= 0 && pdata->dma[1] > 0) {
 382                 ipu_crtc->plane[1] = ipu_plane_init(ipu_crtc->base.dev, ipu,
 383                                                     pdata->dma[1],
 384                                                     IPU_DP_FLOW_SYNC_FG,
 385                                                     BIT(id), false);
 386                 if (IS_ERR(ipu_crtc->plane[1]))
 387                         ipu_crtc->plane[1] = NULL;
 388         }
 389
 390         ipu_crtc->irq = ipu_plane_irq(ipu_crtc->plane[0]);
 391         ret = devm_request_irq(ipu_crtc->dev, ipu_crtc->irq, ipu_irq_handler, 0,
 392                         "imx_drm", ipu_crtc);
 393         if (ret < 0) {
 394                 dev_err(ipu_crtc->dev, "irq request failed with %d.\n", ret);
 395                 goto err_put_plane_res;
 396         }
 397
 398         return 0;
 399
 400 err_put_plane_res:
 401         ipu_plane_put_resources(ipu_crtc->plane[0]);
 402 err_remove_crtc:
 403         imx_drm_remove_crtc(ipu_crtc->imx_crtc);
 404 err_put_resources:
 405         ipu_put_resources(ipu_crtc);
 406
 407         return ret;
 408 }
 409
 410 static struct device_node *ipu_drm_get_port_by_id(struct device_node *parent,
 411                                                   int port_id)
 412 {
 413         struct device_node *port;
 414         int id, ret;
 415
 416         port = of_get_child_by_name(parent, "port");
 417         while (port) {
 418                 ret = of_property_read_u32(port, "reg", &id);
 419                 if (!ret && id == port_id)
 420                         return port;
 421
 422                 do {
 423                         port = of_get_next_child(parent, port);
 424                         if (!port)
 425                                 return NULL;
 426                 } while (of_node_cmp(port->name, "port"));
 427         }
 428
 429         return NULL;
 430 }
 431
 432 static int ipu_drm_bind(struct device *dev, struct device *master, void *data)
 433 {
 434         struct ipu_client_platformdata *pdata = dev->platform_data;
 435         struct drm_device *drm = data;
 436         struct ipu_crtc *ipu_crtc;
 437         int ret;
 438
 439         ipu_crtc = devm_kzalloc(dev, sizeof(*ipu_crtc), GFP_KERNEL);
 440         if (!ipu_crtc)
 441                 return -ENOMEM;
 442
 443         ipu_crtc->dev = dev;
 444
 445         ret = ipu_crtc_init(ipu_crtc, pdata, drm);
 446         if (ret)
 447                 return ret;
 448
 449         dev_set_drvdata(dev, ipu_crtc);
 450
 451         return 0;
 452 }
 453
 454 static void ipu_drm_unbind(struct device *dev, struct device *master,
 455         void *data)
 456 {
 457         struct ipu_crtc *ipu_crtc = dev_get_drvdata(dev);
 458
 459         imx_drm_remove_crtc(ipu_crtc->imx_crtc);
 460
 461         ipu_plane_put_resources(ipu_crtc->plane[0]);
 462         ipu_put_resources(ipu_crtc);
 463 }
 464
 465 static const struct component_ops ipu_crtc_ops = {
 466         .bind = ipu_drm_bind,
 467         .unbind = ipu_drm_unbind,
 468 };
 469
 470 static int ipu_drm_probe(struct platform_device *pdev)
 471 {
 472         struct device *dev = &pdev->dev;
 473         struct ipu_client_platformdata *pdata = dev->platform_data;
 474         int ret;
 475
 476         if (!dev->platform_data)
 477                 return -EINVAL;
 478
 479         if (!dev->of_node) {
 480                 /* Associate crtc device with the corresponding DI port node */
 481                 dev->of_node = ipu_drm_get_port_by_id(dev->parent->of_node,
 482                                                       pdata->di + 2);
 483                 if (!dev->of_node) {
 484                         dev_err(dev, "missing port@%d node in %s\n",
 485                                 pdata->di + 2, dev->parent->of_node->full_name);
 486                         return -ENODEV;
 487                 }
 488         }
 489
 490         ret = dma_set_coherent_mask(dev, DMA_BIT_MASK(32));
 491         if (ret)
 492                 return ret;
 493
 494         return component_add(dev, &ipu_crtc_ops);
 495 }
 496
 497 static int ipu_drm_remove(struct platform_device *pdev)
 498 {
 499         component_del(&pdev->dev, &ipu_crtc_ops);
 500         return 0;
 501 }
 502
 503 static struct platform_driver ipu_drm_driver = {
 504         .driver = {
 505                 .name = "imx-ipuv3-crtc",
 506         },
 507         .probe = ipu_drm_probe,
 508         .remove = ipu_drm_remove,
 509 };
 510 module_platform_driver(ipu_drm_driver);
 511
 512 MODULE_AUTHOR("Sascha Hauer <s.hauer@pengutronix.de>");
 513 MODULE_DESCRIPTION(DRIVER_DESC);
 514 MODULE_LICENSE("GPL");
 515 MODULE_ALIAS("platform:imx-ipuv3-crtc");