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_atomic.h>
  22 #include <drm/drm_atomic_helper.h>
  23 #include <drm/drm_crtc_helper.h>
  24 #include <linux/clk.h>
  25 #include <linux/errno.h>
  26 #include <drm/drm_gem_cma_helper.h>
  27 #include <drm/drm_fb_cma_helper.h>
  28
  29 #include <video/imx-ipu-v3.h>
  30 #include "imx-drm.h"
  31 #include "ipuv3-plane.h"
  32
  33 #define DRIVER_DESC             "i.MX IPUv3 Graphics"
  34
  35 struct ipu_crtc {
  36         struct device           *dev;
  37         struct drm_crtc         base;
  38         struct imx_drm_crtc     *imx_crtc;
  39
  40         /* plane[0] is the full plane, plane[1] is the partial plane */
  41         struct ipu_plane        *plane[2];
  42
  43         struct ipu_dc           *dc;
  44         struct ipu_di           *di;
  45         int                     irq;
  46 };
  47
  48 static inline struct ipu_crtc *to_ipu_crtc(struct drm_crtc *crtc)
  49 {
  50         return container_of(crtc, struct ipu_crtc, base);
  51 }
  52
  53 static void ipu_crtc_enable(struct drm_crtc *crtc)
  54 {
  55         struct ipu_crtc *ipu_crtc = to_ipu_crtc(crtc);
  56         struct ipu_soc *ipu = dev_get_drvdata(ipu_crtc->dev->parent);
  57
  58         ipu_dc_enable(ipu);
  59         ipu_dc_enable_channel(ipu_crtc->dc);
  60         ipu_di_enable(ipu_crtc->di);
  61 }
  62
  63 static void ipu_crtc_atomic_disable(struct drm_crtc *crtc,
  64                                     struct drm_crtc_state *old_crtc_state)
  65 {
  66         struct ipu_crtc *ipu_crtc = to_ipu_crtc(crtc);
  67         struct ipu_soc *ipu = dev_get_drvdata(ipu_crtc->dev->parent);
  68
  69         ipu_dc_disable_channel(ipu_crtc->dc);
  70         ipu_di_disable(ipu_crtc->di);
  71         ipu_dc_disable(ipu);
  72
  73         spin_lock_irq(&crtc->dev->event_lock);
  74         if (crtc->state->event) {
  75                 drm_crtc_send_vblank_event(crtc, crtc->state->event);
  76                 crtc->state->event = NULL;
  77         }
  78         spin_unlock_irq(&crtc->dev->event_lock);
  79
  80         /* always disable planes on the CRTC */
  81         drm_atomic_helper_disable_planes_on_crtc(old_crtc_state, true);
  82
  83         drm_crtc_vblank_off(crtc);
  84 }
  85
  86 static void imx_drm_crtc_reset(struct drm_crtc *crtc)
  87 {
  88         struct imx_crtc_state *state;
  89
  90         if (crtc->state) {
  91                 if (crtc->state->mode_blob)
  92                         drm_property_unreference_blob(crtc->state->mode_blob);
  93
  94                 state = to_imx_crtc_state(crtc->state);
  95                 memset(state, 0, sizeof(*state));
  96         } else {
  97                 state = kzalloc(sizeof(*state), GFP_KERNEL);
  98                 if (!state)
  99                         return;
 100                 crtc->state = &state->base;
 101         }
 102
 103         state->base.crtc = crtc;
 104 }
 105
 106 static struct drm_crtc_state *imx_drm_crtc_duplicate_state(struct drm_crtc *crtc)
 107 {
 108         struct imx_crtc_state *state;
 109
 110         state = kzalloc(sizeof(*state), GFP_KERNEL);
 111         if (!state)
 112                 return NULL;
 113
 114         __drm_atomic_helper_crtc_duplicate_state(crtc, &state->base);
 115
 116         WARN_ON(state->base.crtc != crtc);
 117         state->base.crtc = crtc;
 118
 119         return &state->base;
 120 }
 121
 122 static void imx_drm_crtc_destroy_state(struct drm_crtc *crtc,
 123                                        struct drm_crtc_state *state)
 124 {
 125         __drm_atomic_helper_crtc_destroy_state(state);
 126         kfree(to_imx_crtc_state(state));
 127 }
 128
 129 static void imx_drm_crtc_destroy(struct drm_crtc *crtc)
 130 {
 131         imx_drm_remove_crtc(to_ipu_crtc(crtc)->imx_crtc);
 132 }
 133
 134 static const struct drm_crtc_funcs ipu_crtc_funcs = {
 135         .set_config = drm_atomic_helper_set_config,
 136         .destroy = imx_drm_crtc_destroy,
 137         .page_flip = drm_atomic_helper_page_flip,
 138         .reset = imx_drm_crtc_reset,
 139         .atomic_duplicate_state = imx_drm_crtc_duplicate_state,
 140         .atomic_destroy_state = imx_drm_crtc_destroy_state,
 141 };
 142
 143 static irqreturn_t ipu_irq_handler(int irq, void *dev_id)
 144 {
 145         struct ipu_crtc *ipu_crtc = dev_id;
 146
 147         drm_crtc_handle_vblank(&ipu_crtc->base);
 148
 149         return IRQ_HANDLED;
 150 }
 151
 152 static bool ipu_crtc_mode_fixup(struct drm_crtc *crtc,
 153                                   const struct drm_display_mode *mode,
 154                                   struct drm_display_mode *adjusted_mode)
 155 {
 156         struct ipu_crtc *ipu_crtc = to_ipu_crtc(crtc);
 157         struct videomode vm;
 158         int ret;
 159
 160         drm_display_mode_to_videomode(adjusted_mode, &vm);
 161
 162         ret = ipu_di_adjust_videomode(ipu_crtc->di, &vm);
 163         if (ret)
 164                 return false;
 165
 166         if ((vm.vsync_len == 0) || (vm.hsync_len == 0))
 167                 return false;
 168
 169         drm_display_mode_from_videomode(&vm, adjusted_mode);
 170
 171         return true;
 172 }
 173
 174 static int ipu_crtc_atomic_check(struct drm_crtc *crtc,
 175                                  struct drm_crtc_state *state)
 176 {
 177         u32 primary_plane_mask = 1 << drm_plane_index(crtc->primary);
 178
 179         if (state->active && (primary_plane_mask & state->plane_mask) == 0)
 180                 return -EINVAL;
 181
 182         return 0;
 183 }
 184
 185 static void ipu_crtc_atomic_begin(struct drm_crtc *crtc,
 186                                   struct drm_crtc_state *old_crtc_state)
 187 {
 188         drm_crtc_vblank_on(crtc);
 189
 190         spin_lock_irq(&crtc->dev->event_lock);
 191         if (crtc->state->event) {
 192                 WARN_ON(drm_crtc_vblank_get(crtc));
 193                 drm_crtc_arm_vblank_event(crtc, crtc->state->event);
 194                 crtc->state->event = NULL;
 195         }
 196         spin_unlock_irq(&crtc->dev->event_lock);
 197 }
 198
 199 static void ipu_crtc_mode_set_nofb(struct drm_crtc *crtc)
 200 {
 201         struct drm_device *dev = crtc->dev;
 202         struct drm_encoder *encoder;
 203         struct ipu_crtc *ipu_crtc = to_ipu_crtc(crtc);
 204         struct drm_display_mode *mode = &crtc->state->adjusted_mode;
 205         struct imx_crtc_state *imx_crtc_state = to_imx_crtc_state(crtc->state);
 206         struct ipu_di_signal_cfg sig_cfg = {};
 207         unsigned long encoder_types = 0;
 208
 209         dev_dbg(ipu_crtc->dev, "%s: mode->hdisplay: %d\n", __func__,
 210                         mode->hdisplay);
 211         dev_dbg(ipu_crtc->dev, "%s: mode->vdisplay: %d\n", __func__,
 212                         mode->vdisplay);
 213
 214         list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
 215                 if (encoder->crtc == crtc)
 216                         encoder_types |= BIT(encoder->encoder_type);
 217         }
 218
 219         dev_dbg(ipu_crtc->dev, "%s: attached to encoder types 0x%lx\n",
 220                 __func__, encoder_types);
 221
 222         /*
 223          * If we have DAC or LDB, then we need the IPU DI clock to be
 224          * the same as the LDB DI clock. For TVDAC, derive the IPU DI
 225          * clock from 27 MHz TVE_DI clock, but allow to divide it.
 226          */
 227         if (encoder_types & (BIT(DRM_MODE_ENCODER_DAC) |
 228                              BIT(DRM_MODE_ENCODER_LVDS)))
 229                 sig_cfg.clkflags = IPU_DI_CLKMODE_SYNC | IPU_DI_CLKMODE_EXT;
 230         else if (encoder_types & BIT(DRM_MODE_ENCODER_TVDAC))
 231                 sig_cfg.clkflags = IPU_DI_CLKMODE_EXT;
 232         else
 233                 sig_cfg.clkflags = 0;
 234
 235         sig_cfg.enable_pol = !(imx_crtc_state->bus_flags & DRM_BUS_FLAG_DE_LOW);
 236         /* Default to driving pixel data on negative clock edges */
 237         sig_cfg.clk_pol = !!(imx_crtc_state->bus_flags &
 238                              DRM_BUS_FLAG_PIXDATA_POSEDGE);
 239         sig_cfg.bus_format = imx_crtc_state->bus_format;
 240         sig_cfg.v_to_h_sync = 0;
 241         sig_cfg.hsync_pin = imx_crtc_state->di_hsync_pin;
 242         sig_cfg.vsync_pin = imx_crtc_state->di_vsync_pin;
 243
 244         drm_display_mode_to_videomode(mode, &sig_cfg.mode);
 245
 246         ipu_dc_init_sync(ipu_crtc->dc, ipu_crtc->di,
 247                          mode->flags & DRM_MODE_FLAG_INTERLACE,
 248                          imx_crtc_state->bus_format, mode->hdisplay);
 249         ipu_di_init_sync_panel(ipu_crtc->di, &sig_cfg);
 250 }
 251
 252 static const struct drm_crtc_helper_funcs ipu_helper_funcs = {
 253         .mode_fixup = ipu_crtc_mode_fixup,
 254         .mode_set_nofb = ipu_crtc_mode_set_nofb,
 255         .atomic_check = ipu_crtc_atomic_check,
 256         .atomic_begin = ipu_crtc_atomic_begin,
 257         .atomic_disable = ipu_crtc_atomic_disable,
 258         .enable = ipu_crtc_enable,
 259 };
 260
 261 static int ipu_enable_vblank(struct drm_crtc *crtc)
 262 {
 263         struct ipu_crtc *ipu_crtc = to_ipu_crtc(crtc);
 264
 265         enable_irq(ipu_crtc->irq);
 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         disable_irq_nosync(ipu_crtc->irq);
 275 }
 276
 277 static const struct imx_drm_crtc_helper_funcs ipu_crtc_helper_funcs = {
 278         .enable_vblank = ipu_enable_vblank,
 279         .disable_vblank = ipu_disable_vblank,
 280         .crtc_funcs = &ipu_crtc_funcs,
 281         .crtc_helper_funcs = &ipu_helper_funcs,
 282 };
 283
 284 static void ipu_put_resources(struct ipu_crtc *ipu_crtc)
 285 {
 286         if (!IS_ERR_OR_NULL(ipu_crtc->dc))
 287                 ipu_dc_put(ipu_crtc->dc);
 288         if (!IS_ERR_OR_NULL(ipu_crtc->di))
 289                 ipu_di_put(ipu_crtc->di);
 290 }
 291
 292 static int ipu_get_resources(struct ipu_crtc *ipu_crtc,
 293                 struct ipu_client_platformdata *pdata)
 294 {
 295         struct ipu_soc *ipu = dev_get_drvdata(ipu_crtc->dev->parent);
 296         int ret;
 297
 298         ipu_crtc->dc = ipu_dc_get(ipu, pdata->dc);
 299         if (IS_ERR(ipu_crtc->dc)) {
 300                 ret = PTR_ERR(ipu_crtc->dc);
 301                 goto err_out;
 302         }
 303
 304         ipu_crtc->di = ipu_di_get(ipu, pdata->di);
 305         if (IS_ERR(ipu_crtc->di)) {
 306                 ret = PTR_ERR(ipu_crtc->di);
 307                 goto err_out;
 308         }
 309
 310         return 0;
 311 err_out:
 312         ipu_put_resources(ipu_crtc);
 313
 314         return ret;
 315 }
 316
 317 static int ipu_crtc_init(struct ipu_crtc *ipu_crtc,
 318         struct ipu_client_platformdata *pdata, struct drm_device *drm)
 319 {
 320         struct ipu_soc *ipu = dev_get_drvdata(ipu_crtc->dev->parent);
 321         int dp = -EINVAL;
 322         int ret;
 323
 324         ret = ipu_get_resources(ipu_crtc, pdata);
 325         if (ret) {
 326                 dev_err(ipu_crtc->dev, "getting resources failed with %d.\n",
 327                                 ret);
 328                 return ret;
 329         }
 330
 331         if (pdata->dp >= 0)
 332                 dp = IPU_DP_FLOW_SYNC_BG;
 333         ipu_crtc->plane[0] = ipu_plane_init(drm, ipu, pdata->dma[0], dp, 0,
 334                                             DRM_PLANE_TYPE_PRIMARY);
 335         if (IS_ERR(ipu_crtc->plane[0])) {
 336                 ret = PTR_ERR(ipu_crtc->plane[0]);
 337                 goto err_put_resources;
 338         }
 339
 340         ret = imx_drm_add_crtc(drm, &ipu_crtc->base, &ipu_crtc->imx_crtc,
 341                         &ipu_crtc->plane[0]->base, &ipu_crtc_helper_funcs,
 342                         pdata->of_node);
 343         if (ret) {
 344                 dev_err(ipu_crtc->dev, "adding crtc failed with %d.\n", ret);
 345                 goto err_put_resources;
 346         }
 347
 348         ret = ipu_plane_get_resources(ipu_crtc->plane[0]);
 349         if (ret) {
 350                 dev_err(ipu_crtc->dev, "getting plane 0 resources failed with %d.\n",
 351                         ret);
 352                 goto err_remove_crtc;
 353         }
 354
 355         /* If this crtc is using the DP, add an overlay plane */
 356         if (pdata->dp >= 0 && pdata->dma[1] > 0) {
 357                 ipu_crtc->plane[1] = ipu_plane_init(drm, ipu, pdata->dma[1],
 358                                                 IPU_DP_FLOW_SYNC_FG,
 359                                                 drm_crtc_mask(&ipu_crtc->base),
 360                                                 DRM_PLANE_TYPE_OVERLAY);
 361                 if (IS_ERR(ipu_crtc->plane[1])) {
 362                         ipu_crtc->plane[1] = NULL;
 363                 } else {
 364                         ret = ipu_plane_get_resources(ipu_crtc->plane[1]);
 365                         if (ret) {
 366                                 dev_err(ipu_crtc->dev, "getting plane 1 "
 367                                         "resources failed with %d.\n", ret);
 368                                 goto err_put_plane0_res;
 369                         }
 370                 }
 371         }
 372
 373         ipu_crtc->irq = ipu_plane_irq(ipu_crtc->plane[0]);
 374         ret = devm_request_irq(ipu_crtc->dev, ipu_crtc->irq, ipu_irq_handler, 0,
 375                         "imx_drm", ipu_crtc);
 376         if (ret < 0) {
 377                 dev_err(ipu_crtc->dev, "irq request failed with %d.\n", ret);
 378                 goto err_put_plane1_res;
 379         }
 380         /* Only enable IRQ when we actually need it to trigger work. */
 381         disable_irq(ipu_crtc->irq);
 382
 383         return 0;
 384
 385 err_put_plane1_res:
 386         if (ipu_crtc->plane[1])
 387                 ipu_plane_put_resources(ipu_crtc->plane[1]);
 388 err_put_plane0_res:
 389         ipu_plane_put_resources(ipu_crtc->plane[0]);
 390 err_remove_crtc:
 391         imx_drm_remove_crtc(ipu_crtc->imx_crtc);
 392 err_put_resources:
 393         ipu_put_resources(ipu_crtc);
 394
 395         return ret;
 396 }
 397
 398 static int ipu_drm_bind(struct device *dev, struct device *master, void *data)
 399 {
 400         struct ipu_client_platformdata *pdata = dev->platform_data;
 401         struct drm_device *drm = data;
 402         struct ipu_crtc *ipu_crtc;
 403         int ret;
 404
 405         ipu_crtc = devm_kzalloc(dev, sizeof(*ipu_crtc), GFP_KERNEL);
 406         if (!ipu_crtc)
 407                 return -ENOMEM;
 408
 409         ipu_crtc->dev = dev;
 410
 411         ret = ipu_crtc_init(ipu_crtc, pdata, drm);
 412         if (ret)
 413                 return ret;
 414
 415         dev_set_drvdata(dev, ipu_crtc);
 416
 417         return 0;
 418 }
 419
 420 static void ipu_drm_unbind(struct device *dev, struct device *master,
 421         void *data)
 422 {
 423         struct ipu_crtc *ipu_crtc = dev_get_drvdata(dev);
 424
 425         ipu_put_resources(ipu_crtc);
 426         if (ipu_crtc->plane[1])
 427                 ipu_plane_put_resources(ipu_crtc->plane[1]);
 428         ipu_plane_put_resources(ipu_crtc->plane[0]);
 429 }
 430
 431 static const struct component_ops ipu_crtc_ops = {
 432         .bind = ipu_drm_bind,
 433         .unbind = ipu_drm_unbind,
 434 };
 435
 436 static int ipu_drm_probe(struct platform_device *pdev)
 437 {
 438         struct device *dev = &pdev->dev;
 439         int ret;
 440
 441         if (!dev->platform_data)
 442                 return -EINVAL;
 443
 444         ret = dma_set_coherent_mask(dev, DMA_BIT_MASK(32));
 445         if (ret)
 446                 return ret;
 447
 448         return component_add(dev, &ipu_crtc_ops);
 449 }
 450
 451 static int ipu_drm_remove(struct platform_device *pdev)
 452 {
 453         component_del(&pdev->dev, &ipu_crtc_ops);
 454         return 0;
 455 }
 456
 457 static struct platform_driver ipu_drm_driver = {
 458         .driver = {
 459                 .name = "imx-ipuv3-crtc",
 460         },
 461         .probe = ipu_drm_probe,
 462         .remove = ipu_drm_remove,
 463 };
 464 module_platform_driver(ipu_drm_driver);
 465
 466 MODULE_AUTHOR("Sascha Hauer <s.hauer@pengutronix.de>");
 467 MODULE_DESCRIPTION(DRIVER_DESC);
 468 MODULE_LICENSE("GPL");
 469 MODULE_ALIAS("platform:imx-ipuv3-crtc");