drivers/staging/imx-drm/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  * You should have received a copy of the GNU General Public License
  16  * along with this program; if not, write to the Free Software
  17  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
  18  * MA 02110-1301, USA.
  19  */
  20 #include <linux/component.h>
  21 #include <linux/module.h>
  22 #include <linux/export.h>
  23 #include <linux/device.h>
  24 #include <linux/platform_device.h>
  25 #include <drm/drmP.h>
  26 #include <drm/drm_crtc_helper.h>
  27 #include <linux/fb.h>
  28 #include <linux/clk.h>
  29 #include <linux/errno.h>
  30 #include <drm/drm_gem_cma_helper.h>
  31 #include <drm/drm_fb_cma_helper.h>
  32
  33 #include "ipu-v3/imx-ipu-v3.h"
  34 #include "imx-drm.h"
  35 #include "ipuv3-plane.h"
  36
  37 #define DRIVER_DESC             "i.MX IPUv3 Graphics"
  38
  39 struct ipu_crtc {
  40         struct device           *dev;
  41         struct drm_crtc         base;
  42         struct imx_drm_crtc     *imx_crtc;
  43
  44         /* plane[0] is the full plane, plane[1] is the partial plane */
  45         struct ipu_plane        *plane[2];
  46
  47         struct ipu_dc           *dc;
  48         struct ipu_di           *di;
  49         int                     enabled;
  50         struct drm_pending_vblank_event *page_flip_event;
  51         struct drm_framebuffer  *newfb;
  52         int                     irq;
  53         u32                     interface_pix_fmt;
  54         unsigned long           di_clkflags;
  55         int                     di_hsync_pin;
  56         int                     di_vsync_pin;
  57 };
  58
  59 #define to_ipu_crtc(x) container_of(x, struct ipu_crtc, base)
  60
  61 static void ipu_fb_enable(struct ipu_crtc *ipu_crtc)
  62 {
  63         if (ipu_crtc->enabled)
  64                 return;
  65
  66         /* TODO: Enable DC module here, right now it is never disabled */
  67         ipu_plane_enable(ipu_crtc->plane[0]);
  68         /* Start DC channel and DI after IDMAC */
  69         ipu_dc_enable_channel(ipu_crtc->dc);
  70         ipu_di_enable(ipu_crtc->di);
  71
  72         ipu_crtc->enabled = 1;
  73 }
  74
  75 static void ipu_fb_disable(struct ipu_crtc *ipu_crtc)
  76 {
  77         if (!ipu_crtc->enabled)
  78                 return;
  79
  80         /* Stop DC channel and DI before IDMAC */
  81         ipu_dc_disable_channel(ipu_crtc->dc);
  82         ipu_di_disable(ipu_crtc->di);
  83         ipu_plane_disable(ipu_crtc->plane[0]);
  84         /* TODO: Disable DC module here */
  85
  86         ipu_crtc->enabled = 0;
  87 }
  88
  89 static void ipu_crtc_dpms(struct drm_crtc *crtc, int mode)
  90 {
  91         struct ipu_crtc *ipu_crtc = to_ipu_crtc(crtc);
  92
  93         dev_dbg(ipu_crtc->dev, "%s mode: %d\n", __func__, mode);
  94
  95         switch (mode) {
  96         case DRM_MODE_DPMS_ON:
  97                 ipu_fb_enable(ipu_crtc);
  98                 break;
  99         case DRM_MODE_DPMS_STANDBY:
 100         case DRM_MODE_DPMS_SUSPEND:
 101         case DRM_MODE_DPMS_OFF:
 102                 ipu_fb_disable(ipu_crtc);
 103                 break;
 104         }
 105 }
 106
 107 static int ipu_page_flip(struct drm_crtc *crtc,
 108                 struct drm_framebuffer *fb,
 109                 struct drm_pending_vblank_event *event,
 110                 uint32_t page_flip_flags)
 111 {
 112         struct ipu_crtc *ipu_crtc = to_ipu_crtc(crtc);
 113         int ret;
 114
 115         if (ipu_crtc->newfb)
 116                 return -EBUSY;
 117
 118         ret = imx_drm_crtc_vblank_get(ipu_crtc->imx_crtc);
 119         if (ret) {
 120                 dev_dbg(ipu_crtc->dev, "failed to acquire vblank counter\n");
 121                 list_del(&event->base.link);
 122
 123                 return ret;
 124         }
 125
 126         ipu_crtc->newfb = fb;
 127         ipu_crtc->page_flip_event = event;
 128         crtc->primary->fb = fb;
 129
 130         return 0;
 131 }
 132
 133 static const struct drm_crtc_funcs ipu_crtc_funcs = {
 134         .set_config = drm_crtc_helper_set_config,
 135         .destroy = drm_crtc_cleanup,
 136         .page_flip = ipu_page_flip,
 137 };
 138
 139 static int ipu_crtc_mode_set(struct drm_crtc *crtc,
 140                                struct drm_display_mode *orig_mode,
 141                                struct drm_display_mode *mode,
 142                                int x, int y,
 143                                struct drm_framebuffer *old_fb)
 144 {
 145         struct ipu_crtc *ipu_crtc = to_ipu_crtc(crtc);
 146         int ret;
 147         struct ipu_di_signal_cfg sig_cfg = {};
 148         u32 out_pixel_fmt;
 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         out_pixel_fmt = ipu_crtc->interface_pix_fmt;
 156
 157         if (mode->flags & DRM_MODE_FLAG_INTERLACE)
 158                 sig_cfg.interlaced = 1;
 159         if (mode->flags & DRM_MODE_FLAG_PHSYNC)
 160                 sig_cfg.Hsync_pol = 1;
 161         if (mode->flags & DRM_MODE_FLAG_PVSYNC)
 162                 sig_cfg.Vsync_pol = 1;
 163
 164         sig_cfg.enable_pol = 1;
 165         sig_cfg.clk_pol = 0;
 166         sig_cfg.width = mode->hdisplay;
 167         sig_cfg.height = mode->vdisplay;
 168         sig_cfg.pixel_fmt = out_pixel_fmt;
 169         sig_cfg.h_start_width = mode->htotal - mode->hsync_end;
 170         sig_cfg.h_sync_width = mode->hsync_end - mode->hsync_start;
 171         sig_cfg.h_end_width = mode->hsync_start - mode->hdisplay;
 172
 173         sig_cfg.v_start_width = mode->vtotal - mode->vsync_end;
 174         sig_cfg.v_sync_width = mode->vsync_end - mode->vsync_start;
 175         sig_cfg.v_end_width = mode->vsync_start - mode->vdisplay;
 176         sig_cfg.pixelclock = mode->clock * 1000;
 177         sig_cfg.clkflags = ipu_crtc->di_clkflags;
 178
 179         sig_cfg.v_to_h_sync = 0;
 180
 181         sig_cfg.hsync_pin = ipu_crtc->di_hsync_pin;
 182         sig_cfg.vsync_pin = ipu_crtc->di_vsync_pin;
 183
 184         ret = ipu_dc_init_sync(ipu_crtc->dc, ipu_crtc->di, sig_cfg.interlaced,
 185                         out_pixel_fmt, mode->hdisplay);
 186         if (ret) {
 187                 dev_err(ipu_crtc->dev,
 188                                 "initializing display controller failed with %d\n",
 189                                 ret);
 190                 return ret;
 191         }
 192
 193         ret = ipu_di_init_sync_panel(ipu_crtc->di, &sig_cfg);
 194         if (ret) {
 195                 dev_err(ipu_crtc->dev,
 196                                 "initializing panel failed with %d\n", ret);
 197                 return ret;
 198         }
 199
 200         return ipu_plane_mode_set(ipu_crtc->plane[0], crtc, mode, crtc->primary->fb,
 201                                   0, 0, mode->hdisplay, mode->vdisplay,
 202                                   x, y, mode->hdisplay, mode->vdisplay);
 203 }
 204
 205 static void ipu_crtc_handle_pageflip(struct ipu_crtc *ipu_crtc)
 206 {
 207         unsigned long flags;
 208         struct drm_device *drm = ipu_crtc->base.dev;
 209
 210         spin_lock_irqsave(&drm->event_lock, flags);
 211         if (ipu_crtc->page_flip_event)
 212                 drm_send_vblank_event(drm, -1, ipu_crtc->page_flip_event);
 213         ipu_crtc->page_flip_event = NULL;
 214         imx_drm_crtc_vblank_put(ipu_crtc->imx_crtc);
 215         spin_unlock_irqrestore(&drm->event_lock, flags);
 216 }
 217
 218 static irqreturn_t ipu_irq_handler(int irq, void *dev_id)
 219 {
 220         struct ipu_crtc *ipu_crtc = dev_id;
 221
 222         imx_drm_handle_vblank(ipu_crtc->imx_crtc);
 223
 224         if (ipu_crtc->newfb) {
 225                 ipu_crtc->newfb = NULL;
 226                 ipu_plane_set_base(ipu_crtc->plane[0], ipu_crtc->base.primary->fb,
 227                                 ipu_crtc->plane[0]->x, ipu_crtc->plane[0]->y);
 228                 ipu_crtc_handle_pageflip(ipu_crtc);
 229         }
 230
 231         return IRQ_HANDLED;
 232 }
 233
 234 static bool ipu_crtc_mode_fixup(struct drm_crtc *crtc,
 235                                   const struct drm_display_mode *mode,
 236                                   struct drm_display_mode *adjusted_mode)
 237 {
 238         return true;
 239 }
 240
 241 static void ipu_crtc_prepare(struct drm_crtc *crtc)
 242 {
 243         struct ipu_crtc *ipu_crtc = to_ipu_crtc(crtc);
 244
 245         ipu_fb_disable(ipu_crtc);
 246 }
 247
 248 static void ipu_crtc_commit(struct drm_crtc *crtc)
 249 {
 250         struct ipu_crtc *ipu_crtc = to_ipu_crtc(crtc);
 251
 252         ipu_fb_enable(ipu_crtc);
 253 }
 254
 255 static struct drm_crtc_helper_funcs ipu_helper_funcs = {
 256         .dpms = ipu_crtc_dpms,
 257         .mode_fixup = ipu_crtc_mode_fixup,
 258         .mode_set = ipu_crtc_mode_set,
 259         .prepare = ipu_crtc_prepare,
 260         .commit = ipu_crtc_commit,
 261 };
 262
 263 static int ipu_enable_vblank(struct drm_crtc *crtc)
 264 {
 265         return 0;
 266 }
 267
 268 static void ipu_disable_vblank(struct drm_crtc *crtc)
 269 {
 270         struct ipu_crtc *ipu_crtc = to_ipu_crtc(crtc);
 271
 272         ipu_crtc->page_flip_event = NULL;
 273         ipu_crtc->newfb = NULL;
 274 }
 275
 276 static int ipu_set_interface_pix_fmt(struct drm_crtc *crtc, u32 encoder_type,
 277                 u32 pixfmt, int hsync_pin, int vsync_pin)
 278 {
 279         struct ipu_crtc *ipu_crtc = to_ipu_crtc(crtc);
 280
 281         ipu_crtc->interface_pix_fmt = pixfmt;
 282         ipu_crtc->di_hsync_pin = hsync_pin;
 283         ipu_crtc->di_vsync_pin = vsync_pin;
 284
 285         switch (encoder_type) {
 286         case DRM_MODE_ENCODER_DAC:
 287         case DRM_MODE_ENCODER_TVDAC:
 288         case DRM_MODE_ENCODER_LVDS:
 289                 ipu_crtc->di_clkflags = IPU_DI_CLKMODE_SYNC |
 290                         IPU_DI_CLKMODE_EXT;
 291                 break;
 292         case DRM_MODE_ENCODER_TMDS:
 293         case DRM_MODE_ENCODER_NONE:
 294                 ipu_crtc->di_clkflags = 0;
 295                 break;
 296         }
 297
 298         return 0;
 299 }
 300
 301 static const struct imx_drm_crtc_helper_funcs ipu_crtc_helper_funcs = {
 302         .enable_vblank = ipu_enable_vblank,
 303         .disable_vblank = ipu_disable_vblank,
 304         .set_interface_pix_fmt = ipu_set_interface_pix_fmt,
 305         .crtc_funcs = &ipu_crtc_funcs,
 306         .crtc_helper_funcs = &ipu_helper_funcs,
 307 };
 308
 309 static void ipu_put_resources(struct ipu_crtc *ipu_crtc)
 310 {
 311         if (!IS_ERR_OR_NULL(ipu_crtc->dc))
 312                 ipu_dc_put(ipu_crtc->dc);
 313         if (!IS_ERR_OR_NULL(ipu_crtc->di))
 314                 ipu_di_put(ipu_crtc->di);
 315 }
 316
 317 static int ipu_get_resources(struct ipu_crtc *ipu_crtc,
 318                 struct ipu_client_platformdata *pdata)
 319 {
 320         struct ipu_soc *ipu = dev_get_drvdata(ipu_crtc->dev->parent);
 321         int ret;
 322
 323         ipu_crtc->dc = ipu_dc_get(ipu, pdata->dc);
 324         if (IS_ERR(ipu_crtc->dc)) {
 325                 ret = PTR_ERR(ipu_crtc->dc);
 326                 goto err_out;
 327         }
 328
 329         ipu_crtc->di = ipu_di_get(ipu, pdata->di);
 330         if (IS_ERR(ipu_crtc->di)) {
 331                 ret = PTR_ERR(ipu_crtc->di);
 332                 goto err_out;
 333         }
 334
 335         return 0;
 336 err_out:
 337         ipu_put_resources(ipu_crtc);
 338
 339         return ret;
 340 }
 341
 342 static int ipu_crtc_init(struct ipu_crtc *ipu_crtc,
 343         struct ipu_client_platformdata *pdata, struct drm_device *drm)
 344 {
 345         struct ipu_soc *ipu = dev_get_drvdata(ipu_crtc->dev->parent);
 346         int dp = -EINVAL;
 347         int ret;
 348         int id;
 349
 350         ret = ipu_get_resources(ipu_crtc, pdata);
 351         if (ret) {
 352                 dev_err(ipu_crtc->dev, "getting resources failed with %d.\n",
 353                                 ret);
 354                 return ret;
 355         }
 356
 357         ret = imx_drm_add_crtc(drm, &ipu_crtc->base, &ipu_crtc->imx_crtc,
 358                         &ipu_crtc_helper_funcs, ipu_crtc->dev->of_node);
 359         if (ret) {
 360                 dev_err(ipu_crtc->dev, "adding crtc failed with %d.\n", ret);
 361                 goto err_put_resources;
 362         }
 363
 364         if (pdata->dp >= 0)
 365                 dp = IPU_DP_FLOW_SYNC_BG;
 366         id = imx_drm_crtc_id(ipu_crtc->imx_crtc);
 367         ipu_crtc->plane[0] = ipu_plane_init(ipu_crtc->base.dev, ipu,
 368                                             pdata->dma[0], dp, BIT(id), true);
 369         ret = ipu_plane_get_resources(ipu_crtc->plane[0]);
 370         if (ret) {
 371                 dev_err(ipu_crtc->dev, "getting plane 0 resources failed with %d.\n",
 372                         ret);
 373                 goto err_remove_crtc;
 374         }
 375
 376         /* If this crtc is using the DP, add an overlay plane */
 377         if (pdata->dp >= 0 && pdata->dma[1] > 0) {
 378                 ipu_crtc->plane[1] = ipu_plane_init(ipu_crtc->base.dev, ipu,
 379                                                     pdata->dma[1],
 380                                                     IPU_DP_FLOW_SYNC_FG,
 381                                                     BIT(id), false);
 382                 if (IS_ERR(ipu_crtc->plane[1]))
 383                         ipu_crtc->plane[1] = NULL;
 384         }
 385
 386         ipu_crtc->irq = ipu_plane_irq(ipu_crtc->plane[0]);
 387         ret = devm_request_irq(ipu_crtc->dev, ipu_crtc->irq, ipu_irq_handler, 0,
 388                         "imx_drm", ipu_crtc);
 389         if (ret < 0) {
 390                 dev_err(ipu_crtc->dev, "irq request failed with %d.\n", ret);
 391                 goto err_put_plane_res;
 392         }
 393
 394         return 0;
 395
 396 err_put_plane_res:
 397         ipu_plane_put_resources(ipu_crtc->plane[0]);
 398 err_remove_crtc:
 399         imx_drm_remove_crtc(ipu_crtc->imx_crtc);
 400 err_put_resources:
 401         ipu_put_resources(ipu_crtc);
 402
 403         return ret;
 404 }
 405
 406 static struct device_node *ipu_drm_get_port_by_id(struct device_node *parent,
 407                                                   int port_id)
 408 {
 409         struct device_node *port;
 410         int id, ret;
 411
 412         port = of_get_child_by_name(parent, "port");
 413         while (port) {
 414                 ret = of_property_read_u32(port, "reg", &id);
 415                 if (!ret && id == port_id)
 416                         return port;
 417
 418                 do {
 419                         port = of_get_next_child(parent, port);
 420                         if (!port)
 421                                 return NULL;
 422                 } while (of_node_cmp(port->name, "port"));
 423         }
 424
 425         return NULL;
 426 }
 427
 428 static int ipu_drm_bind(struct device *dev, struct device *master, void *data)
 429 {
 430         struct ipu_client_platformdata *pdata = dev->platform_data;
 431         struct drm_device *drm = data;
 432         struct ipu_crtc *ipu_crtc;
 433         int ret;
 434
 435         ipu_crtc = devm_kzalloc(dev, sizeof(*ipu_crtc), GFP_KERNEL);
 436         if (!ipu_crtc)
 437                 return -ENOMEM;
 438
 439         ipu_crtc->dev = dev;
 440
 441         ret = ipu_crtc_init(ipu_crtc, pdata, drm);
 442         if (ret)
 443                 return ret;
 444
 445         dev_set_drvdata(dev, ipu_crtc);
 446
 447         return 0;
 448 }
 449
 450 static void ipu_drm_unbind(struct device *dev, struct device *master,
 451         void *data)
 452 {
 453         struct ipu_crtc *ipu_crtc = dev_get_drvdata(dev);
 454
 455         imx_drm_remove_crtc(ipu_crtc->imx_crtc);
 456
 457         ipu_plane_put_resources(ipu_crtc->plane[0]);
 458         ipu_put_resources(ipu_crtc);
 459 }
 460
 461 static const struct component_ops ipu_crtc_ops = {
 462         .bind = ipu_drm_bind,
 463         .unbind = ipu_drm_unbind,
 464 };
 465
 466 static int ipu_drm_probe(struct platform_device *pdev)
 467 {
 468         struct device *dev = &pdev->dev;
 469         struct ipu_client_platformdata *pdata = dev->platform_data;
 470         int ret;
 471
 472         if (!dev->platform_data)
 473                 return -EINVAL;
 474
 475         if (!dev->of_node) {
 476                 /* Associate crtc device with the corresponding DI port node */
 477                 dev->of_node = ipu_drm_get_port_by_id(dev->parent->of_node,
 478                                                       pdata->di + 2);
 479                 if (!dev->of_node) {
 480                         dev_err(dev, "missing port@%d node in %s\n",
 481                                 pdata->di + 2, dev->parent->of_node->full_name);
 482                         return -ENODEV;
 483                 }
 484         }
 485
 486         ret = dma_set_coherent_mask(dev, DMA_BIT_MASK(32));
 487         if (ret)
 488                 return ret;
 489
 490         return component_add(dev, &ipu_crtc_ops);
 491 }
 492
 493 static int ipu_drm_remove(struct platform_device *pdev)
 494 {
 495         component_del(&pdev->dev, &ipu_crtc_ops);
 496         return 0;
 497 }
 498
 499 static struct platform_driver ipu_drm_driver = {
 500         .driver = {
 501                 .name = "imx-ipuv3-crtc",
 502         },
 503         .probe = ipu_drm_probe,
 504         .remove = ipu_drm_remove,
 505 };
 506 module_platform_driver(ipu_drm_driver);
 507
 508 MODULE_AUTHOR("Sascha Hauer <s.hauer@pengutronix.de>");
 509 MODULE_DESCRIPTION(DRIVER_DESC);
 510 MODULE_LICENSE("GPL");
 511 MODULE_ALIAS("platform:imx-ipuv3-crtc");