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 <video/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         struct ipu_soc *ipu = dev_get_drvdata(ipu_crtc->dev->parent);
  64
  65         if (ipu_crtc->enabled)
  66                 return;
  67
  68         ipu_dc_enable(ipu);
  69         ipu_plane_enable(ipu_crtc->plane[0]);
  70         /* Start DC channel and DI after IDMAC */
  71         ipu_dc_enable_channel(ipu_crtc->dc);
  72         ipu_di_enable(ipu_crtc->di);
  73
  74         ipu_crtc->enabled = 1;
  75 }
  76
  77 static void ipu_fb_disable(struct ipu_crtc *ipu_crtc)
  78 {
  79         struct ipu_soc *ipu = dev_get_drvdata(ipu_crtc->dev->parent);
  80
  81         if (!ipu_crtc->enabled)
  82                 return;
  83
  84         /* Stop DC channel and DI before IDMAC */
  85         ipu_dc_disable_channel(ipu_crtc->dc);
  86         ipu_di_disable(ipu_crtc->di);
  87         ipu_plane_disable(ipu_crtc->plane[0]);
  88         ipu_dc_disable(ipu);
  89
  90         ipu_crtc->enabled = 0;
  91 }
  92
  93 static void ipu_crtc_dpms(struct drm_crtc *crtc, int mode)
  94 {
  95         struct ipu_crtc *ipu_crtc = to_ipu_crtc(crtc);
  96
  97         dev_dbg(ipu_crtc->dev, "%s mode: %d\n", __func__, mode);
  98
  99         switch (mode) {
 100         case DRM_MODE_DPMS_ON:
 101                 ipu_fb_enable(ipu_crtc);
 102                 break;
 103         case DRM_MODE_DPMS_STANDBY:
 104         case DRM_MODE_DPMS_SUSPEND:
 105         case DRM_MODE_DPMS_OFF:
 106                 ipu_fb_disable(ipu_crtc);
 107                 break;
 108         }
 109 }
 110
 111 static int ipu_page_flip(struct drm_crtc *crtc,
 112                 struct drm_framebuffer *fb,
 113                 struct drm_pending_vblank_event *event,
 114                 uint32_t page_flip_flags)
 115 {
 116         struct ipu_crtc *ipu_crtc = to_ipu_crtc(crtc);
 117         int ret;
 118
 119         if (ipu_crtc->newfb)
 120                 return -EBUSY;
 121
 122         ret = imx_drm_crtc_vblank_get(ipu_crtc->imx_crtc);
 123         if (ret) {
 124                 dev_dbg(ipu_crtc->dev, "failed to acquire vblank counter\n");
 125                 list_del(&event->base.link);
 126
 127                 return ret;
 128         }
 129
 130         ipu_crtc->newfb = fb;
 131         ipu_crtc->page_flip_event = event;
 132         crtc->primary->fb = fb;
 133
 134         return 0;
 135 }
 136
 137 static const struct drm_crtc_funcs ipu_crtc_funcs = {
 138         .set_config = drm_crtc_helper_set_config,
 139         .destroy = drm_crtc_cleanup,
 140         .page_flip = ipu_page_flip,
 141 };
 142
 143 static int ipu_crtc_mode_set(struct drm_crtc *crtc,
 144                                struct drm_display_mode *orig_mode,
 145                                struct drm_display_mode *mode,
 146                                int x, int y,
 147                                struct drm_framebuffer *old_fb)
 148 {
 149         struct ipu_crtc *ipu_crtc = to_ipu_crtc(crtc);
 150         int ret;
 151         struct ipu_di_signal_cfg sig_cfg = {};
 152         u32 out_pixel_fmt;
 153
 154         dev_dbg(ipu_crtc->dev, "%s: mode->hdisplay: %d\n", __func__,
 155                         mode->hdisplay);
 156         dev_dbg(ipu_crtc->dev, "%s: mode->vdisplay: %d\n", __func__,
 157                         mode->vdisplay);
 158
 159         out_pixel_fmt = ipu_crtc->interface_pix_fmt;
 160
 161         if (mode->flags & DRM_MODE_FLAG_INTERLACE)
 162                 sig_cfg.interlaced = 1;
 163         if (mode->flags & DRM_MODE_FLAG_PHSYNC)
 164                 sig_cfg.Hsync_pol = 1;
 165         if (mode->flags & DRM_MODE_FLAG_PVSYNC)
 166                 sig_cfg.Vsync_pol = 1;
 167
 168         sig_cfg.enable_pol = 1;
 169         sig_cfg.clk_pol = 0;
 170         sig_cfg.width = mode->hdisplay;
 171         sig_cfg.height = mode->vdisplay;
 172         sig_cfg.pixel_fmt = out_pixel_fmt;
 173         sig_cfg.h_start_width = mode->htotal - mode->hsync_end;
 174         sig_cfg.h_sync_width = mode->hsync_end - mode->hsync_start;
 175         sig_cfg.h_end_width = mode->hsync_start - mode->hdisplay;
 176
 177         sig_cfg.v_start_width = mode->vtotal - mode->vsync_end;
 178         sig_cfg.v_sync_width = mode->vsync_end - mode->vsync_start;
 179         sig_cfg.v_end_width = mode->vsync_start - mode->vdisplay;
 180         sig_cfg.pixelclock = mode->clock * 1000;
 181         sig_cfg.clkflags = ipu_crtc->di_clkflags;
 182
 183         sig_cfg.v_to_h_sync = 0;
 184
 185         sig_cfg.hsync_pin = ipu_crtc->di_hsync_pin;
 186         sig_cfg.vsync_pin = ipu_crtc->di_vsync_pin;
 187
 188         ret = ipu_dc_init_sync(ipu_crtc->dc, ipu_crtc->di, sig_cfg.interlaced,
 189                         out_pixel_fmt, mode->hdisplay);
 190         if (ret) {
 191                 dev_err(ipu_crtc->dev,
 192                                 "initializing display controller failed with %d\n",
 193                                 ret);
 194                 return ret;
 195         }
 196
 197         ret = ipu_di_init_sync_panel(ipu_crtc->di, &sig_cfg);
 198         if (ret) {
 199                 dev_err(ipu_crtc->dev,
 200                                 "initializing panel failed with %d\n", ret);
 201                 return ret;
 202         }
 203
 204         return ipu_plane_mode_set(ipu_crtc->plane[0], crtc, mode, crtc->primary->fb,
 205                                   0, 0, mode->hdisplay, mode->vdisplay,
 206                                   x, y, mode->hdisplay, mode->vdisplay);
 207 }
 208
 209 static void ipu_crtc_handle_pageflip(struct ipu_crtc *ipu_crtc)
 210 {
 211         unsigned long flags;
 212         struct drm_device *drm = ipu_crtc->base.dev;
 213
 214         spin_lock_irqsave(&drm->event_lock, flags);
 215         if (ipu_crtc->page_flip_event)
 216                 drm_send_vblank_event(drm, -1, ipu_crtc->page_flip_event);
 217         ipu_crtc->page_flip_event = NULL;
 218         imx_drm_crtc_vblank_put(ipu_crtc->imx_crtc);
 219         spin_unlock_irqrestore(&drm->event_lock, flags);
 220 }
 221
 222 static irqreturn_t ipu_irq_handler(int irq, void *dev_id)
 223 {
 224         struct ipu_crtc *ipu_crtc = dev_id;
 225
 226         imx_drm_handle_vblank(ipu_crtc->imx_crtc);
 227
 228         if (ipu_crtc->newfb) {
 229                 ipu_crtc->newfb = NULL;
 230                 ipu_plane_set_base(ipu_crtc->plane[0], ipu_crtc->base.primary->fb,
 231                                 ipu_crtc->plane[0]->x, ipu_crtc->plane[0]->y);
 232                 ipu_crtc_handle_pageflip(ipu_crtc);
 233         }
 234
 235         return IRQ_HANDLED;
 236 }
 237
 238 static bool ipu_crtc_mode_fixup(struct drm_crtc *crtc,
 239                                   const struct drm_display_mode *mode,
 240                                   struct drm_display_mode *adjusted_mode)
 241 {
 242         return true;
 243 }
 244
 245 static void ipu_crtc_prepare(struct drm_crtc *crtc)
 246 {
 247         struct ipu_crtc *ipu_crtc = to_ipu_crtc(crtc);
 248
 249         ipu_fb_disable(ipu_crtc);
 250 }
 251
 252 static void ipu_crtc_commit(struct drm_crtc *crtc)
 253 {
 254         struct ipu_crtc *ipu_crtc = to_ipu_crtc(crtc);
 255
 256         ipu_fb_enable(ipu_crtc);
 257 }
 258
 259 static struct drm_crtc_helper_funcs ipu_helper_funcs = {
 260         .dpms = ipu_crtc_dpms,
 261         .mode_fixup = ipu_crtc_mode_fixup,
 262         .mode_set = ipu_crtc_mode_set,
 263         .prepare = ipu_crtc_prepare,
 264         .commit = ipu_crtc_commit,
 265 };
 266
 267 static int ipu_enable_vblank(struct drm_crtc *crtc)
 268 {
 269         return 0;
 270 }
 271
 272 static void ipu_disable_vblank(struct drm_crtc *crtc)
 273 {
 274         struct ipu_crtc *ipu_crtc = to_ipu_crtc(crtc);
 275
 276         ipu_crtc->page_flip_event = NULL;
 277         ipu_crtc->newfb = NULL;
 278 }
 279
 280 static int ipu_set_interface_pix_fmt(struct drm_crtc *crtc, u32 encoder_type,
 281                 u32 pixfmt, int hsync_pin, int vsync_pin)
 282 {
 283         struct ipu_crtc *ipu_crtc = to_ipu_crtc(crtc);
 284
 285         ipu_crtc->interface_pix_fmt = pixfmt;
 286         ipu_crtc->di_hsync_pin = hsync_pin;
 287         ipu_crtc->di_vsync_pin = vsync_pin;
 288
 289         switch (encoder_type) {
 290         case DRM_MODE_ENCODER_DAC:
 291         case DRM_MODE_ENCODER_TVDAC:
 292         case DRM_MODE_ENCODER_LVDS:
 293                 ipu_crtc->di_clkflags = IPU_DI_CLKMODE_SYNC |
 294                         IPU_DI_CLKMODE_EXT;
 295                 break;
 296         case DRM_MODE_ENCODER_TMDS:
 297         case DRM_MODE_ENCODER_NONE:
 298                 ipu_crtc->di_clkflags = 0;
 299                 break;
 300         }
 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");