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         drm_crtc_vblank_on(&ipu_crtc->base);
  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         drm_crtc_vblank_off(&ipu_crtc->base);
  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 drm_device *dev = crtc->dev;
 146         struct drm_encoder *encoder;
 147         struct ipu_crtc *ipu_crtc = to_ipu_crtc(crtc);
 148         struct ipu_di_signal_cfg sig_cfg = {};
 149         unsigned long encoder_types = 0;
 150         int ret;
 151
 152         dev_dbg(ipu_crtc->dev, "%s: mode->hdisplay: %d\n", __func__,
 153                         mode->hdisplay);
 154         dev_dbg(ipu_crtc->dev, "%s: mode->vdisplay: %d\n", __func__,
 155                         mode->vdisplay);
 156
 157         list_for_each_entry(encoder, &dev->mode_config.encoder_list, head)
 158                 if (encoder->crtc == crtc)
 159                         encoder_types |= BIT(encoder->encoder_type);
 160
 161         dev_dbg(ipu_crtc->dev, "%s: attached to encoder types 0x%lx\n",
 162                 __func__, encoder_types);
 163
 164         /*
 165          * If we have DAC or LDB, then we need the IPU DI clock to be
 166          * the same as the LDB DI clock. For TVDAC, derive the IPU DI
 167          * clock from 27 MHz TVE_DI clock, but allow to divide it.
 168          */
 169         if (encoder_types & (BIT(DRM_MODE_ENCODER_DAC) |
 170                              BIT(DRM_MODE_ENCODER_LVDS)))
 171                 sig_cfg.clkflags = IPU_DI_CLKMODE_SYNC | IPU_DI_CLKMODE_EXT;
 172         else if (encoder_types & BIT(DRM_MODE_ENCODER_TVDAC))
 173                 sig_cfg.clkflags = IPU_DI_CLKMODE_EXT;
 174         else
 175                 sig_cfg.clkflags = 0;
 176
 177         sig_cfg.enable_pol = 1;
 178         sig_cfg.clk_pol = 0;
 179         sig_cfg.bus_format = ipu_crtc->bus_format;
 180         sig_cfg.v_to_h_sync = 0;
 181         sig_cfg.hsync_pin = ipu_crtc->di_hsync_pin;
 182         sig_cfg.vsync_pin = ipu_crtc->di_vsync_pin;
 183
 184         drm_display_mode_to_videomode(mode, &sig_cfg.mode);
 185
 186         ret = ipu_dc_init_sync(ipu_crtc->dc, ipu_crtc->di,
 187                                mode->flags & DRM_MODE_FLAG_INTERLACE,
 188                                ipu_crtc->bus_format, mode->hdisplay);
 189         if (ret) {
 190                 dev_err(ipu_crtc->dev,
 191                                 "initializing display controller failed with %d\n",
 192                                 ret);
 193                 return ret;
 194         }
 195
 196         ret = ipu_di_init_sync_panel(ipu_crtc->di, &sig_cfg);
 197         if (ret) {
 198                 dev_err(ipu_crtc->dev,
 199                                 "initializing panel failed with %d\n", ret);
 200                 return ret;
 201         }
 202
 203         return ipu_plane_mode_set(ipu_crtc->plane[0], crtc, mode,
 204                                   crtc->primary->fb,
 205                                   0, 0, mode->hdisplay, mode->vdisplay,
 206                                   x, y, mode->hdisplay, mode->vdisplay,
 207                                   mode->flags & DRM_MODE_FLAG_INTERLACE);
 208 }
 209
 210 static void ipu_crtc_handle_pageflip(struct ipu_crtc *ipu_crtc)
 211 {
 212         unsigned long flags;
 213         struct drm_device *drm = ipu_crtc->base.dev;
 214
 215         spin_lock_irqsave(&drm->event_lock, flags);
 216         if (ipu_crtc->page_flip_event)
 217                 drm_crtc_send_vblank_event(&ipu_crtc->base,
 218                                            ipu_crtc->page_flip_event);
 219         ipu_crtc->page_flip_event = NULL;
 220         imx_drm_crtc_vblank_put(ipu_crtc->imx_crtc);
 221         spin_unlock_irqrestore(&drm->event_lock, flags);
 222 }
 223
 224 static irqreturn_t ipu_irq_handler(int irq, void *dev_id)
 225 {
 226         struct ipu_crtc *ipu_crtc = dev_id;
 227
 228         imx_drm_handle_vblank(ipu_crtc->imx_crtc);
 229
 230         if (ipu_crtc->newfb) {
 231                 struct ipu_plane *plane = ipu_crtc->plane[0];
 232
 233                 ipu_crtc->newfb = NULL;
 234                 ipu_plane_set_base(plane, ipu_crtc->base.primary->fb,
 235                                    plane->x, plane->y);
 236                 ipu_crtc_handle_pageflip(ipu_crtc);
 237         }
 238
 239         return IRQ_HANDLED;
 240 }
 241
 242 static bool ipu_crtc_mode_fixup(struct drm_crtc *crtc,
 243                                   const struct drm_display_mode *mode,
 244                                   struct drm_display_mode *adjusted_mode)
 245 {
 246         struct ipu_crtc *ipu_crtc = to_ipu_crtc(crtc);
 247         struct videomode vm;
 248         int ret;
 249
 250         drm_display_mode_to_videomode(adjusted_mode, &vm);
 251
 252         ret = ipu_di_adjust_videomode(ipu_crtc->di, &vm);
 253         if (ret)
 254                 return false;
 255
 256         drm_display_mode_from_videomode(&vm, adjusted_mode);
 257
 258         return true;
 259 }
 260
 261 static void ipu_crtc_prepare(struct drm_crtc *crtc)
 262 {
 263         struct ipu_crtc *ipu_crtc = to_ipu_crtc(crtc);
 264
 265         ipu_fb_disable(ipu_crtc);
 266 }
 267
 268 static void ipu_crtc_commit(struct drm_crtc *crtc)
 269 {
 270         struct ipu_crtc *ipu_crtc = to_ipu_crtc(crtc);
 271
 272         ipu_fb_enable(ipu_crtc);
 273 }
 274
 275 static const struct drm_crtc_helper_funcs ipu_helper_funcs = {
 276         .dpms = ipu_crtc_dpms,
 277         .mode_fixup = ipu_crtc_mode_fixup,
 278         .mode_set = ipu_crtc_mode_set,
 279         .prepare = ipu_crtc_prepare,
 280         .commit = ipu_crtc_commit,
 281 };
 282
 283 static int ipu_enable_vblank(struct drm_crtc *crtc)
 284 {
 285         return 0;
 286 }
 287
 288 static void ipu_disable_vblank(struct drm_crtc *crtc)
 289 {
 290         struct ipu_crtc *ipu_crtc = to_ipu_crtc(crtc);
 291
 292         ipu_crtc->page_flip_event = NULL;
 293         ipu_crtc->newfb = NULL;
 294 }
 295
 296 static int ipu_set_interface_pix_fmt(struct drm_crtc *crtc,
 297                 u32 bus_format, int hsync_pin, int vsync_pin)
 298 {
 299         struct ipu_crtc *ipu_crtc = to_ipu_crtc(crtc);
 300
 301         ipu_crtc->bus_format = bus_format;
 302         ipu_crtc->di_hsync_pin = hsync_pin;
 303         ipu_crtc->di_vsync_pin = vsync_pin;
 304
 305         return 0;
 306 }
 307
 308 static const struct imx_drm_crtc_helper_funcs ipu_crtc_helper_funcs = {
 309         .enable_vblank = ipu_enable_vblank,
 310         .disable_vblank = ipu_disable_vblank,
 311         .set_interface_pix_fmt = ipu_set_interface_pix_fmt,
 312         .crtc_funcs = &ipu_crtc_funcs,
 313         .crtc_helper_funcs = &ipu_helper_funcs,
 314 };
 315
 316 static void ipu_put_resources(struct ipu_crtc *ipu_crtc)
 317 {
 318         if (!IS_ERR_OR_NULL(ipu_crtc->dc))
 319                 ipu_dc_put(ipu_crtc->dc);
 320         if (!IS_ERR_OR_NULL(ipu_crtc->di))
 321                 ipu_di_put(ipu_crtc->di);
 322 }
 323
 324 static int ipu_get_resources(struct ipu_crtc *ipu_crtc,
 325                 struct ipu_client_platformdata *pdata)
 326 {
 327         struct ipu_soc *ipu = dev_get_drvdata(ipu_crtc->dev->parent);
 328         int ret;
 329
 330         ipu_crtc->dc = ipu_dc_get(ipu, pdata->dc);
 331         if (IS_ERR(ipu_crtc->dc)) {
 332                 ret = PTR_ERR(ipu_crtc->dc);
 333                 goto err_out;
 334         }
 335
 336         ipu_crtc->di = ipu_di_get(ipu, pdata->di);
 337         if (IS_ERR(ipu_crtc->di)) {
 338                 ret = PTR_ERR(ipu_crtc->di);
 339                 goto err_out;
 340         }
 341
 342         return 0;
 343 err_out:
 344         ipu_put_resources(ipu_crtc);
 345
 346         return ret;
 347 }
 348
 349 static int ipu_crtc_init(struct ipu_crtc *ipu_crtc,
 350         struct ipu_client_platformdata *pdata, struct drm_device *drm)
 351 {
 352         struct ipu_soc *ipu = dev_get_drvdata(ipu_crtc->dev->parent);
 353         int dp = -EINVAL;
 354         int ret;
 355
 356         ret = ipu_get_resources(ipu_crtc, pdata);
 357         if (ret) {
 358                 dev_err(ipu_crtc->dev, "getting resources failed with %d.\n",
 359                                 ret);
 360                 return ret;
 361         }
 362
 363         if (pdata->dp >= 0)
 364                 dp = IPU_DP_FLOW_SYNC_BG;
 365         ipu_crtc->plane[0] = ipu_plane_init(drm, ipu, pdata->dma[0], dp, 0,
 366                                             DRM_PLANE_TYPE_PRIMARY);
 367         if (IS_ERR(ipu_crtc->plane[0])) {
 368                 ret = PTR_ERR(ipu_crtc->plane[0]);
 369                 goto err_put_resources;
 370         }
 371
 372         ret = imx_drm_add_crtc(drm, &ipu_crtc->base, &ipu_crtc->imx_crtc,
 373                         &ipu_crtc->plane[0]->base, &ipu_crtc_helper_funcs,
 374                         ipu_crtc->dev->of_node);
 375         if (ret) {
 376                 dev_err(ipu_crtc->dev, "adding crtc failed with %d.\n", ret);
 377                 goto err_put_resources;
 378         }
 379
 380         ret = ipu_plane_get_resources(ipu_crtc->plane[0]);
 381         if (ret) {
 382                 dev_err(ipu_crtc->dev, "getting plane 0 resources failed with %d.\n",
 383                         ret);
 384                 goto err_remove_crtc;
 385         }
 386
 387         /* If this crtc is using the DP, add an overlay plane */
 388         if (pdata->dp >= 0 && pdata->dma[1] > 0) {
 389                 ipu_crtc->plane[1] = ipu_plane_init(drm, ipu, pdata->dma[1],
 390                                                 IPU_DP_FLOW_SYNC_FG,
 391                                                 drm_crtc_mask(&ipu_crtc->base),
 392                                                 DRM_PLANE_TYPE_OVERLAY);
 393                 if (IS_ERR(ipu_crtc->plane[1]))
 394                         ipu_crtc->plane[1] = NULL;
 395         }
 396
 397         ipu_crtc->irq = ipu_plane_irq(ipu_crtc->plane[0]);
 398         ret = devm_request_irq(ipu_crtc->dev, ipu_crtc->irq, ipu_irq_handler, 0,
 399                         "imx_drm", ipu_crtc);
 400         if (ret < 0) {
 401                 dev_err(ipu_crtc->dev, "irq request failed with %d.\n", ret);
 402                 goto err_put_plane_res;
 403         }
 404
 405         return 0;
 406
 407 err_put_plane_res:
 408         ipu_plane_put_resources(ipu_crtc->plane[0]);
 409 err_remove_crtc:
 410         imx_drm_remove_crtc(ipu_crtc->imx_crtc);
 411 err_put_resources:
 412         ipu_put_resources(ipu_crtc);
 413
 414         return ret;
 415 }
 416
 417 static int ipu_drm_bind(struct device *dev, struct device *master, void *data)
 418 {
 419         struct ipu_client_platformdata *pdata = dev->platform_data;
 420         struct drm_device *drm = data;
 421         struct ipu_crtc *ipu_crtc;
 422         int ret;
 423
 424         ipu_crtc = devm_kzalloc(dev, sizeof(*ipu_crtc), GFP_KERNEL);
 425         if (!ipu_crtc)
 426                 return -ENOMEM;
 427
 428         ipu_crtc->dev = dev;
 429
 430         ret = ipu_crtc_init(ipu_crtc, pdata, drm);
 431         if (ret)
 432                 return ret;
 433
 434         dev_set_drvdata(dev, ipu_crtc);
 435
 436         return 0;
 437 }
 438
 439 static void ipu_drm_unbind(struct device *dev, struct device *master,
 440         void *data)
 441 {
 442         struct ipu_crtc *ipu_crtc = dev_get_drvdata(dev);
 443
 444         imx_drm_remove_crtc(ipu_crtc->imx_crtc);
 445
 446         ipu_plane_put_resources(ipu_crtc->plane[0]);
 447         ipu_put_resources(ipu_crtc);
 448 }
 449
 450 static const struct component_ops ipu_crtc_ops = {
 451         .bind = ipu_drm_bind,
 452         .unbind = ipu_drm_unbind,
 453 };
 454
 455 static int ipu_drm_probe(struct platform_device *pdev)
 456 {
 457         struct device *dev = &pdev->dev;
 458         int ret;
 459
 460         if (!dev->platform_data)
 461                 return -EINVAL;
 462
 463         ret = dma_set_coherent_mask(dev, DMA_BIT_MASK(32));
 464         if (ret)
 465                 return ret;
 466
 467         return component_add(dev, &ipu_crtc_ops);
 468 }
 469
 470 static int ipu_drm_remove(struct platform_device *pdev)
 471 {
 472         component_del(&pdev->dev, &ipu_crtc_ops);
 473         return 0;
 474 }
 475
 476 static struct platform_driver ipu_drm_driver = {
 477         .driver = {
 478                 .name = "imx-ipuv3-crtc",
 479         },
 480         .probe = ipu_drm_probe,
 481         .remove = ipu_drm_remove,
 482 };
 483 module_platform_driver(ipu_drm_driver);
 484
 485 MODULE_AUTHOR("Sascha Hauer <s.hauer@pengutronix.de>");
 486 MODULE_DESCRIPTION(DRIVER_DESC);
 487 MODULE_LICENSE("GPL");
 488 MODULE_ALIAS("platform:imx-ipuv3-crtc");