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_crtc_send_vblank_event(&ipu_crtc->base,
 216                                            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                 struct ipu_plane *plane = ipu_crtc->plane[0];
 230
 231                 ipu_crtc->newfb = NULL;
 232                 ipu_plane_set_base(plane, ipu_crtc->base.primary->fb,
 233                                    plane->x, plane->y);
 234                 ipu_crtc_handle_pageflip(ipu_crtc);
 235         }
 236
 237         return IRQ_HANDLED;
 238 }
 239
 240 static bool ipu_crtc_mode_fixup(struct drm_crtc *crtc,
 241                                   const struct drm_display_mode *mode,
 242                                   struct drm_display_mode *adjusted_mode)
 243 {
 244         struct ipu_crtc *ipu_crtc = to_ipu_crtc(crtc);
 245         struct videomode vm;
 246         int ret;
 247
 248         drm_display_mode_to_videomode(adjusted_mode, &vm);
 249
 250         ret = ipu_di_adjust_videomode(ipu_crtc->di, &vm);
 251         if (ret)
 252                 return false;
 253
 254         drm_display_mode_from_videomode(&vm, adjusted_mode);
 255
 256         return true;
 257 }
 258
 259 static void ipu_crtc_prepare(struct drm_crtc *crtc)
 260 {
 261         struct ipu_crtc *ipu_crtc = to_ipu_crtc(crtc);
 262
 263         ipu_fb_disable(ipu_crtc);
 264 }
 265
 266 static void ipu_crtc_commit(struct drm_crtc *crtc)
 267 {
 268         struct ipu_crtc *ipu_crtc = to_ipu_crtc(crtc);
 269
 270         ipu_fb_enable(ipu_crtc);
 271 }
 272
 273 static struct drm_crtc_helper_funcs ipu_helper_funcs = {
 274         .dpms = ipu_crtc_dpms,
 275         .mode_fixup = ipu_crtc_mode_fixup,
 276         .mode_set = ipu_crtc_mode_set,
 277         .prepare = ipu_crtc_prepare,
 278         .commit = ipu_crtc_commit,
 279 };
 280
 281 static int ipu_enable_vblank(struct drm_crtc *crtc)
 282 {
 283         return 0;
 284 }
 285
 286 static void ipu_disable_vblank(struct drm_crtc *crtc)
 287 {
 288         struct ipu_crtc *ipu_crtc = to_ipu_crtc(crtc);
 289
 290         ipu_crtc->page_flip_event = NULL;
 291         ipu_crtc->newfb = NULL;
 292 }
 293
 294 static int ipu_set_interface_pix_fmt(struct drm_crtc *crtc,
 295                 u32 bus_format, int hsync_pin, int vsync_pin)
 296 {
 297         struct ipu_crtc *ipu_crtc = to_ipu_crtc(crtc);
 298
 299         ipu_crtc->bus_format = bus_format;
 300         ipu_crtc->di_hsync_pin = hsync_pin;
 301         ipu_crtc->di_vsync_pin = vsync_pin;
 302
 303         return 0;
 304 }
 305
 306 static const struct imx_drm_crtc_helper_funcs ipu_crtc_helper_funcs = {
 307         .enable_vblank = ipu_enable_vblank,
 308         .disable_vblank = ipu_disable_vblank,
 309         .set_interface_pix_fmt = ipu_set_interface_pix_fmt,
 310         .crtc_funcs = &ipu_crtc_funcs,
 311         .crtc_helper_funcs = &ipu_helper_funcs,
 312 };
 313
 314 static void ipu_put_resources(struct ipu_crtc *ipu_crtc)
 315 {
 316         if (!IS_ERR_OR_NULL(ipu_crtc->dc))
 317                 ipu_dc_put(ipu_crtc->dc);
 318         if (!IS_ERR_OR_NULL(ipu_crtc->di))
 319                 ipu_di_put(ipu_crtc->di);
 320 }
 321
 322 static int ipu_get_resources(struct ipu_crtc *ipu_crtc,
 323                 struct ipu_client_platformdata *pdata)
 324 {
 325         struct ipu_soc *ipu = dev_get_drvdata(ipu_crtc->dev->parent);
 326         int ret;
 327
 328         ipu_crtc->dc = ipu_dc_get(ipu, pdata->dc);
 329         if (IS_ERR(ipu_crtc->dc)) {
 330                 ret = PTR_ERR(ipu_crtc->dc);
 331                 goto err_out;
 332         }
 333
 334         ipu_crtc->di = ipu_di_get(ipu, pdata->di);
 335         if (IS_ERR(ipu_crtc->di)) {
 336                 ret = PTR_ERR(ipu_crtc->di);
 337                 goto err_out;
 338         }
 339
 340         return 0;
 341 err_out:
 342         ipu_put_resources(ipu_crtc);
 343
 344         return ret;
 345 }
 346
 347 static int ipu_crtc_init(struct ipu_crtc *ipu_crtc,
 348         struct ipu_client_platformdata *pdata, struct drm_device *drm)
 349 {
 350         struct ipu_soc *ipu = dev_get_drvdata(ipu_crtc->dev->parent);
 351         int dp = -EINVAL;
 352         int ret;
 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         if (pdata->dp >= 0)
 362                 dp = IPU_DP_FLOW_SYNC_BG;
 363         ipu_crtc->plane[0] = ipu_plane_init(drm, ipu, pdata->dma[0], dp, 0,
 364                                             DRM_PLANE_TYPE_PRIMARY);
 365         if (IS_ERR(ipu_crtc->plane[0])) {
 366                 ret = PTR_ERR(ipu_crtc->plane[0]);
 367                 goto err_put_resources;
 368         }
 369
 370         ret = imx_drm_add_crtc(drm, &ipu_crtc->base, &ipu_crtc->imx_crtc,
 371                         &ipu_crtc->plane[0]->base, &ipu_crtc_helper_funcs,
 372                         ipu_crtc->dev->of_node);
 373         if (ret) {
 374                 dev_err(ipu_crtc->dev, "adding crtc failed with %d.\n", ret);
 375                 goto err_put_resources;
 376         }
 377
 378         ret = ipu_plane_get_resources(ipu_crtc->plane[0]);
 379         if (ret) {
 380                 dev_err(ipu_crtc->dev, "getting plane 0 resources failed with %d.\n",
 381                         ret);
 382                 goto err_remove_crtc;
 383         }
 384
 385         /* If this crtc is using the DP, add an overlay plane */
 386         if (pdata->dp >= 0 && pdata->dma[1] > 0) {
 387                 ipu_crtc->plane[1] = ipu_plane_init(drm, ipu, pdata->dma[1],
 388                                                 IPU_DP_FLOW_SYNC_FG,
 389                                                 drm_crtc_mask(&ipu_crtc->base),
 390                                                 DRM_PLANE_TYPE_OVERLAY);
 391                 if (IS_ERR(ipu_crtc->plane[1]))
 392                         ipu_crtc->plane[1] = NULL;
 393         }
 394
 395         ipu_crtc->irq = ipu_plane_irq(ipu_crtc->plane[0]);
 396         ret = devm_request_irq(ipu_crtc->dev, ipu_crtc->irq, ipu_irq_handler, 0,
 397                         "imx_drm", ipu_crtc);
 398         if (ret < 0) {
 399                 dev_err(ipu_crtc->dev, "irq request failed with %d.\n", ret);
 400                 goto err_put_plane_res;
 401         }
 402
 403         return 0;
 404
 405 err_put_plane_res:
 406         ipu_plane_put_resources(ipu_crtc->plane[0]);
 407 err_remove_crtc:
 408         imx_drm_remove_crtc(ipu_crtc->imx_crtc);
 409 err_put_resources:
 410         ipu_put_resources(ipu_crtc);
 411
 412         return ret;
 413 }
 414
 415 static int ipu_drm_bind(struct device *dev, struct device *master, void *data)
 416 {
 417         struct ipu_client_platformdata *pdata = dev->platform_data;
 418         struct drm_device *drm = data;
 419         struct ipu_crtc *ipu_crtc;
 420         int ret;
 421
 422         ipu_crtc = devm_kzalloc(dev, sizeof(*ipu_crtc), GFP_KERNEL);
 423         if (!ipu_crtc)
 424                 return -ENOMEM;
 425
 426         ipu_crtc->dev = dev;
 427
 428         ret = ipu_crtc_init(ipu_crtc, pdata, drm);
 429         if (ret)
 430                 return ret;
 431
 432         dev_set_drvdata(dev, ipu_crtc);
 433
 434         return 0;
 435 }
 436
 437 static void ipu_drm_unbind(struct device *dev, struct device *master,
 438         void *data)
 439 {
 440         struct ipu_crtc *ipu_crtc = dev_get_drvdata(dev);
 441
 442         imx_drm_remove_crtc(ipu_crtc->imx_crtc);
 443
 444         ipu_plane_put_resources(ipu_crtc->plane[0]);
 445         ipu_put_resources(ipu_crtc);
 446 }
 447
 448 static const struct component_ops ipu_crtc_ops = {
 449         .bind = ipu_drm_bind,
 450         .unbind = ipu_drm_unbind,
 451 };
 452
 453 static int ipu_drm_probe(struct platform_device *pdev)
 454 {
 455         struct device *dev = &pdev->dev;
 456         int ret;
 457
 458         if (!dev->platform_data)
 459                 return -EINVAL;
 460
 461         ret = dma_set_coherent_mask(dev, DMA_BIT_MASK(32));
 462         if (ret)
 463                 return ret;
 464
 465         return component_add(dev, &ipu_crtc_ops);
 466 }
 467
 468 static int ipu_drm_remove(struct platform_device *pdev)
 469 {
 470         component_del(&pdev->dev, &ipu_crtc_ops);
 471         return 0;
 472 }
 473
 474 static struct platform_driver ipu_drm_driver = {
 475         .driver = {
 476                 .name = "imx-ipuv3-crtc",
 477         },
 478         .probe = ipu_drm_probe,
 479         .remove = ipu_drm_remove,
 480 };
 481 module_platform_driver(ipu_drm_driver);
 482
 483 MODULE_AUTHOR("Sascha Hauer <s.hauer@pengutronix.de>");
 484 MODULE_DESCRIPTION(DRIVER_DESC);
 485 MODULE_LICENSE("GPL");
 486 MODULE_ALIAS("platform:imx-ipuv3-crtc");