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                     interface_pix_fmt;
  49         unsigned long           di_clkflags;
  50         int                     di_hsync_pin;
  51         int                     di_vsync_pin;
  52 };
  53
  54 #define to_ipu_crtc(x) container_of(x, struct ipu_crtc, base)
  55
  56 static void ipu_fb_enable(struct ipu_crtc *ipu_crtc)
  57 {
  58         struct ipu_soc *ipu = dev_get_drvdata(ipu_crtc->dev->parent);
  59
  60         if (ipu_crtc->enabled)
  61                 return;
  62
  63         ipu_dc_enable(ipu);
  64         ipu_plane_enable(ipu_crtc->plane[0]);
  65         /* Start DC channel and DI after IDMAC */
  66         ipu_dc_enable_channel(ipu_crtc->dc);
  67         ipu_di_enable(ipu_crtc->di);
  68
  69         ipu_crtc->enabled = 1;
  70 }
  71
  72 static void ipu_fb_disable(struct ipu_crtc *ipu_crtc)
  73 {
  74         struct ipu_soc *ipu = dev_get_drvdata(ipu_crtc->dev->parent);
  75
  76         if (!ipu_crtc->enabled)
  77                 return;
  78
  79         /* Stop DC channel and DI before IDMAC */
  80         ipu_dc_disable_channel(ipu_crtc->dc);
  81         ipu_di_disable(ipu_crtc->di);
  82         ipu_plane_disable(ipu_crtc->plane[0]);
  83         ipu_dc_disable(ipu);
  84
  85         ipu_crtc->enabled = 0;
  86 }
  87
  88 static void ipu_crtc_dpms(struct drm_crtc *crtc, int mode)
  89 {
  90         struct ipu_crtc *ipu_crtc = to_ipu_crtc(crtc);
  91
  92         dev_dbg(ipu_crtc->dev, "%s mode: %d\n", __func__, mode);
  93
  94         switch (mode) {
  95         case DRM_MODE_DPMS_ON:
  96                 ipu_fb_enable(ipu_crtc);
  97                 break;
  98         case DRM_MODE_DPMS_STANDBY:
  99         case DRM_MODE_DPMS_SUSPEND:
 100         case DRM_MODE_DPMS_OFF:
 101                 ipu_fb_disable(ipu_crtc);
 102                 break;
 103         }
 104 }
 105
 106 static int ipu_page_flip(struct drm_crtc *crtc,
 107                 struct drm_framebuffer *fb,
 108                 struct drm_pending_vblank_event *event,
 109                 uint32_t page_flip_flags)
 110 {
 111         struct ipu_crtc *ipu_crtc = to_ipu_crtc(crtc);
 112         int ret;
 113
 114         if (ipu_crtc->newfb)
 115                 return -EBUSY;
 116
 117         ret = imx_drm_crtc_vblank_get(ipu_crtc->imx_crtc);
 118         if (ret) {
 119                 dev_dbg(ipu_crtc->dev, "failed to acquire vblank counter\n");
 120                 list_del(&event->base.link);
 121
 122                 return ret;
 123         }
 124
 125         ipu_crtc->newfb = fb;
 126         ipu_crtc->page_flip_event = event;
 127         crtc->primary->fb = fb;
 128
 129         return 0;
 130 }
 131
 132 static const struct drm_crtc_funcs ipu_crtc_funcs = {
 133         .set_config = drm_crtc_helper_set_config,
 134         .destroy = drm_crtc_cleanup,
 135         .page_flip = ipu_page_flip,
 136 };
 137
 138 static int ipu_crtc_mode_set(struct drm_crtc *crtc,
 139                                struct drm_display_mode *orig_mode,
 140                                struct drm_display_mode *mode,
 141                                int x, int y,
 142                                struct drm_framebuffer *old_fb)
 143 {
 144         struct ipu_crtc *ipu_crtc = to_ipu_crtc(crtc);
 145         int ret;
 146         struct ipu_di_signal_cfg sig_cfg = {};
 147         u32 out_pixel_fmt;
 148
 149         dev_dbg(ipu_crtc->dev, "%s: mode->hdisplay: %d\n", __func__,
 150                         mode->hdisplay);
 151         dev_dbg(ipu_crtc->dev, "%s: mode->vdisplay: %d\n", __func__,
 152                         mode->vdisplay);
 153
 154         out_pixel_fmt = ipu_crtc->interface_pix_fmt;
 155
 156         if (mode->flags & DRM_MODE_FLAG_INTERLACE)
 157                 sig_cfg.interlaced = 1;
 158         if (mode->flags & DRM_MODE_FLAG_PHSYNC)
 159                 sig_cfg.Hsync_pol = 1;
 160         if (mode->flags & DRM_MODE_FLAG_PVSYNC)
 161                 sig_cfg.Vsync_pol = 1;
 162
 163         sig_cfg.enable_pol = 1;
 164         sig_cfg.clk_pol = 0;
 165         sig_cfg.width = mode->hdisplay;
 166         sig_cfg.height = mode->vdisplay;
 167         sig_cfg.pixel_fmt = out_pixel_fmt;
 168         sig_cfg.h_start_width = mode->htotal - mode->hsync_end;
 169         sig_cfg.h_sync_width = mode->hsync_end - mode->hsync_start;
 170         sig_cfg.h_end_width = mode->hsync_start - mode->hdisplay;
 171
 172         sig_cfg.v_start_width = mode->vtotal - mode->vsync_end;
 173         sig_cfg.v_sync_width = mode->vsync_end - mode->vsync_start;
 174         sig_cfg.v_end_width = mode->vsync_start - mode->vdisplay;
 175         sig_cfg.pixelclock = mode->clock * 1000;
 176         sig_cfg.clkflags = ipu_crtc->di_clkflags;
 177
 178         sig_cfg.v_to_h_sync = 0;
 179
 180         sig_cfg.hsync_pin = ipu_crtc->di_hsync_pin;
 181         sig_cfg.vsync_pin = ipu_crtc->di_vsync_pin;
 182
 183         ret = ipu_dc_init_sync(ipu_crtc->dc, ipu_crtc->di, sig_cfg.interlaced,
 184                         out_pixel_fmt, mode->hdisplay);
 185         if (ret) {
 186                 dev_err(ipu_crtc->dev,
 187                                 "initializing display controller failed with %d\n",
 188                                 ret);
 189                 return ret;
 190         }
 191
 192         ret = ipu_di_init_sync_panel(ipu_crtc->di, &sig_cfg);
 193         if (ret) {
 194                 dev_err(ipu_crtc->dev,
 195                                 "initializing panel failed with %d\n", ret);
 196                 return ret;
 197         }
 198
 199         return ipu_plane_mode_set(ipu_crtc->plane[0], crtc, mode,
 200                                   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                 struct ipu_plane *plane = ipu_crtc->plane[0];
 226
 227                 ipu_crtc->newfb = NULL;
 228                 ipu_plane_set_base(plane, ipu_crtc->base.primary->fb,
 229                                    plane->x, plane->y);
 230                 ipu_crtc_handle_pageflip(ipu_crtc);
 231         }
 232
 233         return IRQ_HANDLED;
 234 }
 235
 236 static bool ipu_crtc_mode_fixup(struct drm_crtc *crtc,
 237                                   const struct drm_display_mode *mode,
 238                                   struct drm_display_mode *adjusted_mode)
 239 {
 240         return true;
 241 }
 242
 243 static void ipu_crtc_prepare(struct drm_crtc *crtc)
 244 {
 245         struct ipu_crtc *ipu_crtc = to_ipu_crtc(crtc);
 246
 247         ipu_fb_disable(ipu_crtc);
 248 }
 249
 250 static void ipu_crtc_commit(struct drm_crtc *crtc)
 251 {
 252         struct ipu_crtc *ipu_crtc = to_ipu_crtc(crtc);
 253
 254         ipu_fb_enable(ipu_crtc);
 255 }
 256
 257 static struct drm_crtc_helper_funcs ipu_helper_funcs = {
 258         .dpms = ipu_crtc_dpms,
 259         .mode_fixup = ipu_crtc_mode_fixup,
 260         .mode_set = ipu_crtc_mode_set,
 261         .prepare = ipu_crtc_prepare,
 262         .commit = ipu_crtc_commit,
 263 };
 264
 265 static int ipu_enable_vblank(struct drm_crtc *crtc)
 266 {
 267         return 0;
 268 }
 269
 270 static void ipu_disable_vblank(struct drm_crtc *crtc)
 271 {
 272         struct ipu_crtc *ipu_crtc = to_ipu_crtc(crtc);
 273
 274         ipu_crtc->page_flip_event = NULL;
 275         ipu_crtc->newfb = NULL;
 276 }
 277
 278 static int ipu_set_interface_pix_fmt(struct drm_crtc *crtc, u32 encoder_type,
 279                 u32 pixfmt, int hsync_pin, int vsync_pin)
 280 {
 281         struct ipu_crtc *ipu_crtc = to_ipu_crtc(crtc);
 282
 283         ipu_crtc->interface_pix_fmt = pixfmt;
 284         ipu_crtc->di_hsync_pin = hsync_pin;
 285         ipu_crtc->di_vsync_pin = vsync_pin;
 286
 287         switch (encoder_type) {
 288         case DRM_MODE_ENCODER_DAC:
 289         case DRM_MODE_ENCODER_TVDAC:
 290         case DRM_MODE_ENCODER_LVDS:
 291                 ipu_crtc->di_clkflags = IPU_DI_CLKMODE_SYNC |
 292                         IPU_DI_CLKMODE_EXT;
 293                 break;
 294         case DRM_MODE_ENCODER_TMDS:
 295         case DRM_MODE_ENCODER_NONE:
 296                 ipu_crtc->di_clkflags = 0;
 297                 break;
 298         }
 299
 300         return 0;
 301 }
 302
 303 static const struct imx_drm_crtc_helper_funcs ipu_crtc_helper_funcs = {
 304         .enable_vblank = ipu_enable_vblank,
 305         .disable_vblank = ipu_disable_vblank,
 306         .set_interface_pix_fmt = ipu_set_interface_pix_fmt,
 307         .crtc_funcs = &ipu_crtc_funcs,
 308         .crtc_helper_funcs = &ipu_helper_funcs,
 309 };
 310
 311 static void ipu_put_resources(struct ipu_crtc *ipu_crtc)
 312 {
 313         if (!IS_ERR_OR_NULL(ipu_crtc->dc))
 314                 ipu_dc_put(ipu_crtc->dc);
 315         if (!IS_ERR_OR_NULL(ipu_crtc->di))
 316                 ipu_di_put(ipu_crtc->di);
 317 }
 318
 319 static int ipu_get_resources(struct ipu_crtc *ipu_crtc,
 320                 struct ipu_client_platformdata *pdata)
 321 {
 322         struct ipu_soc *ipu = dev_get_drvdata(ipu_crtc->dev->parent);
 323         int ret;
 324
 325         ipu_crtc->dc = ipu_dc_get(ipu, pdata->dc);
 326         if (IS_ERR(ipu_crtc->dc)) {
 327                 ret = PTR_ERR(ipu_crtc->dc);
 328                 goto err_out;
 329         }
 330
 331         ipu_crtc->di = ipu_di_get(ipu, pdata->di);
 332         if (IS_ERR(ipu_crtc->di)) {
 333                 ret = PTR_ERR(ipu_crtc->di);
 334                 goto err_out;
 335         }
 336
 337         return 0;
 338 err_out:
 339         ipu_put_resources(ipu_crtc);
 340
 341         return ret;
 342 }
 343
 344 static int ipu_crtc_init(struct ipu_crtc *ipu_crtc,
 345         struct ipu_client_platformdata *pdata, struct drm_device *drm)
 346 {
 347         struct ipu_soc *ipu = dev_get_drvdata(ipu_crtc->dev->parent);
 348         int dp = -EINVAL;
 349         int ret;
 350         int id;
 351
 352         ret = ipu_get_resources(ipu_crtc, pdata);
 353         if (ret) {
 354                 dev_err(ipu_crtc->dev, "getting resources failed with %d.\n",
 355                                 ret);
 356                 return ret;
 357         }
 358
 359         ret = imx_drm_add_crtc(drm, &ipu_crtc->base, &ipu_crtc->imx_crtc,
 360                         &ipu_crtc_helper_funcs, ipu_crtc->dev->of_node);
 361         if (ret) {
 362                 dev_err(ipu_crtc->dev, "adding crtc failed with %d.\n", ret);
 363                 goto err_put_resources;
 364         }
 365
 366         if (pdata->dp >= 0)
 367                 dp = IPU_DP_FLOW_SYNC_BG;
 368         id = imx_drm_crtc_id(ipu_crtc->imx_crtc);
 369         ipu_crtc->plane[0] = ipu_plane_init(ipu_crtc->base.dev, ipu,
 370                                             pdata->dma[0], dp, BIT(id), true);
 371         ret = ipu_plane_get_resources(ipu_crtc->plane[0]);
 372         if (ret) {
 373                 dev_err(ipu_crtc->dev, "getting plane 0 resources failed with %d.\n",
 374                         ret);
 375                 goto err_remove_crtc;
 376         }
 377
 378         /* If this crtc is using the DP, add an overlay plane */
 379         if (pdata->dp >= 0 && pdata->dma[1] > 0) {
 380                 ipu_crtc->plane[1] = ipu_plane_init(ipu_crtc->base.dev, ipu,
 381                                                     pdata->dma[1],
 382                                                     IPU_DP_FLOW_SYNC_FG,
 383                                                     BIT(id), false);
 384                 if (IS_ERR(ipu_crtc->plane[1]))
 385                         ipu_crtc->plane[1] = NULL;
 386         }
 387
 388         ipu_crtc->irq = ipu_plane_irq(ipu_crtc->plane[0]);
 389         ret = devm_request_irq(ipu_crtc->dev, ipu_crtc->irq, ipu_irq_handler, 0,
 390                         "imx_drm", ipu_crtc);
 391         if (ret < 0) {
 392                 dev_err(ipu_crtc->dev, "irq request failed with %d.\n", ret);
 393                 goto err_put_plane_res;
 394         }
 395
 396         return 0;
 397
 398 err_put_plane_res:
 399         ipu_plane_put_resources(ipu_crtc->plane[0]);
 400 err_remove_crtc:
 401         imx_drm_remove_crtc(ipu_crtc->imx_crtc);
 402 err_put_resources:
 403         ipu_put_resources(ipu_crtc);
 404
 405         return ret;
 406 }
 407
 408 static struct device_node *ipu_drm_get_port_by_id(struct device_node *parent,
 409                                                   int port_id)
 410 {
 411         struct device_node *port;
 412         int id, ret;
 413
 414         port = of_get_child_by_name(parent, "port");
 415         while (port) {
 416                 ret = of_property_read_u32(port, "reg", &id);
 417                 if (!ret && id == port_id)
 418                         return port;
 419
 420                 do {
 421                         port = of_get_next_child(parent, port);
 422                         if (!port)
 423                                 return NULL;
 424                 } while (of_node_cmp(port->name, "port"));
 425         }
 426
 427         return NULL;
 428 }
 429
 430 static int ipu_drm_bind(struct device *dev, struct device *master, void *data)
 431 {
 432         struct ipu_client_platformdata *pdata = dev->platform_data;
 433         struct drm_device *drm = data;
 434         struct ipu_crtc *ipu_crtc;
 435         int ret;
 436
 437         ipu_crtc = devm_kzalloc(dev, sizeof(*ipu_crtc), GFP_KERNEL);
 438         if (!ipu_crtc)
 439                 return -ENOMEM;
 440
 441         ipu_crtc->dev = dev;
 442
 443         ret = ipu_crtc_init(ipu_crtc, pdata, drm);
 444         if (ret)
 445                 return ret;
 446
 447         dev_set_drvdata(dev, ipu_crtc);
 448
 449         return 0;
 450 }
 451
 452 static void ipu_drm_unbind(struct device *dev, struct device *master,
 453         void *data)
 454 {
 455         struct ipu_crtc *ipu_crtc = dev_get_drvdata(dev);
 456
 457         imx_drm_remove_crtc(ipu_crtc->imx_crtc);
 458
 459         ipu_plane_put_resources(ipu_crtc->plane[0]);
 460         ipu_put_resources(ipu_crtc);
 461 }
 462
 463 static const struct component_ops ipu_crtc_ops = {
 464         .bind = ipu_drm_bind,
 465         .unbind = ipu_drm_unbind,
 466 };
 467
 468 static int ipu_drm_probe(struct platform_device *pdev)
 469 {
 470         struct device *dev = &pdev->dev;
 471         struct ipu_client_platformdata *pdata = dev->platform_data;
 472         int ret;
 473
 474         if (!dev->platform_data)
 475                 return -EINVAL;
 476
 477         if (!dev->of_node) {
 478                 /* Associate crtc device with the corresponding DI port node */
 479                 dev->of_node = ipu_drm_get_port_by_id(dev->parent->of_node,
 480                                                       pdata->di + 2);
 481                 if (!dev->of_node) {
 482                         dev_err(dev, "missing port@%d node in %s\n",
 483                                 pdata->di + 2, dev->parent->of_node->full_name);
 484                         return -ENODEV;
 485                 }
 486         }
 487
 488         ret = dma_set_coherent_mask(dev, DMA_BIT_MASK(32));
 489         if (ret)
 490                 return ret;
 491
 492         return component_add(dev, &ipu_crtc_ops);
 493 }
 494
 495 static int ipu_drm_remove(struct platform_device *pdev)
 496 {
 497         component_del(&pdev->dev, &ipu_crtc_ops);
 498         return 0;
 499 }
 500
 501 static struct platform_driver ipu_drm_driver = {
 502         .driver = {
 503                 .name = "imx-ipuv3-crtc",
 504         },
 505         .probe = ipu_drm_probe,
 506         .remove = ipu_drm_remove,
 507 };
 508 module_platform_driver(ipu_drm_driver);
 509
 510 MODULE_AUTHOR("Sascha Hauer <s.hauer@pengutronix.de>");
 511 MODULE_DESCRIPTION(DRIVER_DESC);
 512 MODULE_LICENSE("GPL");
 513 MODULE_ALIAS("platform:imx-ipuv3-crtc");