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
  84 static void imx_drm_crtc_reset(struct drm_crtc *crtc)
  85 {
  86         struct imx_crtc_state *state;
  87
  88         if (crtc->state) {
  89                 if (crtc->state->mode_blob)
  90                         drm_property_unreference_blob(crtc->state->mode_blob);
  91
  92                 state = to_imx_crtc_state(crtc->state);
  93                 memset(state, 0, sizeof(*state));
  94         } else {
  95                 state = kzalloc(sizeof(*state), GFP_KERNEL);
  96                 if (!state)
  97                         return;
  98                 crtc->state = &state->base;
  99         }
 100
 101         state->base.crtc = crtc;
 102 }
 103
 104 static struct drm_crtc_state *imx_drm_crtc_duplicate_state(struct drm_crtc *crtc)
 105 {
 106         struct imx_crtc_state *state;
 107
 108         state = kzalloc(sizeof(*state), GFP_KERNEL);
 109         if (!state)
 110                 return NULL;
 111
 112         __drm_atomic_helper_crtc_duplicate_state(crtc, &state->base);
 113
 114         WARN_ON(state->base.crtc != crtc);
 115         state->base.crtc = crtc;
 116
 117         return &state->base;
 118 }
 119
 120 static void imx_drm_crtc_destroy_state(struct drm_crtc *crtc,
 121                                        struct drm_crtc_state *state)
 122 {
 123         __drm_atomic_helper_crtc_destroy_state(state);
 124         kfree(to_imx_crtc_state(state));
 125 }
 126
 127 static void imx_drm_crtc_destroy(struct drm_crtc *crtc)
 128 {
 129         imx_drm_remove_crtc(to_ipu_crtc(crtc)->imx_crtc);
 130 }
 131
 132 static const struct drm_crtc_funcs ipu_crtc_funcs = {
 133         .set_config = drm_atomic_helper_set_config,
 134         .destroy = imx_drm_crtc_destroy,
 135         .page_flip = drm_atomic_helper_page_flip,
 136         .reset = imx_drm_crtc_reset,
 137         .atomic_duplicate_state = imx_drm_crtc_duplicate_state,
 138         .atomic_destroy_state = imx_drm_crtc_destroy_state,
 139 };
 140
 141 static irqreturn_t ipu_irq_handler(int irq, void *dev_id)
 142 {
 143         struct ipu_crtc *ipu_crtc = dev_id;
 144
 145         drm_crtc_handle_vblank(&ipu_crtc->base);
 146
 147         return IRQ_HANDLED;
 148 }
 149
 150 static bool ipu_crtc_mode_fixup(struct drm_crtc *crtc,
 151                                   const struct drm_display_mode *mode,
 152                                   struct drm_display_mode *adjusted_mode)
 153 {
 154         struct ipu_crtc *ipu_crtc = to_ipu_crtc(crtc);
 155         struct videomode vm;
 156         int ret;
 157
 158         drm_display_mode_to_videomode(adjusted_mode, &vm);
 159
 160         ret = ipu_di_adjust_videomode(ipu_crtc->di, &vm);
 161         if (ret)
 162                 return false;
 163
 164         if ((vm.vsync_len == 0) || (vm.hsync_len == 0))
 165                 return false;
 166
 167         drm_display_mode_from_videomode(&vm, adjusted_mode);
 168
 169         return true;
 170 }
 171
 172 static int ipu_crtc_atomic_check(struct drm_crtc *crtc,
 173                                  struct drm_crtc_state *state)
 174 {
 175         u32 primary_plane_mask = 1 << drm_plane_index(crtc->primary);
 176
 177         if (state->active && (primary_plane_mask & state->plane_mask) == 0)
 178                 return -EINVAL;
 179
 180         return 0;
 181 }
 182
 183 static void ipu_crtc_atomic_begin(struct drm_crtc *crtc,
 184                                   struct drm_crtc_state *old_crtc_state)
 185 {
 186         spin_lock_irq(&crtc->dev->event_lock);
 187         if (crtc->state->event) {
 188                 WARN_ON(drm_crtc_vblank_get(crtc));
 189                 drm_crtc_arm_vblank_event(crtc, crtc->state->event);
 190                 crtc->state->event = NULL;
 191         }
 192         spin_unlock_irq(&crtc->dev->event_lock);
 193 }
 194
 195 static void ipu_crtc_mode_set_nofb(struct drm_crtc *crtc)
 196 {
 197         struct drm_device *dev = crtc->dev;
 198         struct drm_encoder *encoder;
 199         struct ipu_crtc *ipu_crtc = to_ipu_crtc(crtc);
 200         struct drm_display_mode *mode = &crtc->state->adjusted_mode;
 201         struct imx_crtc_state *imx_crtc_state = to_imx_crtc_state(crtc->state);
 202         struct ipu_di_signal_cfg sig_cfg = {};
 203         unsigned long encoder_types = 0;
 204
 205         dev_dbg(ipu_crtc->dev, "%s: mode->hdisplay: %d\n", __func__,
 206                         mode->hdisplay);
 207         dev_dbg(ipu_crtc->dev, "%s: mode->vdisplay: %d\n", __func__,
 208                         mode->vdisplay);
 209
 210         list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
 211                 if (encoder->crtc == crtc)
 212                         encoder_types |= BIT(encoder->encoder_type);
 213         }
 214
 215         dev_dbg(ipu_crtc->dev, "%s: attached to encoder types 0x%lx\n",
 216                 __func__, encoder_types);
 217
 218         /*
 219          * If we have DAC or LDB, then we need the IPU DI clock to be
 220          * the same as the LDB DI clock. For TVDAC, derive the IPU DI
 221          * clock from 27 MHz TVE_DI clock, but allow to divide it.
 222          */
 223         if (encoder_types & (BIT(DRM_MODE_ENCODER_DAC) |
 224                              BIT(DRM_MODE_ENCODER_LVDS)))
 225                 sig_cfg.clkflags = IPU_DI_CLKMODE_SYNC | IPU_DI_CLKMODE_EXT;
 226         else if (encoder_types & BIT(DRM_MODE_ENCODER_TVDAC))
 227                 sig_cfg.clkflags = IPU_DI_CLKMODE_EXT;
 228         else
 229                 sig_cfg.clkflags = 0;
 230
 231         sig_cfg.enable_pol = !(imx_crtc_state->bus_flags & DRM_BUS_FLAG_DE_LOW);
 232         /* Default to driving pixel data on negative clock edges */
 233         sig_cfg.clk_pol = !!(imx_crtc_state->bus_flags &
 234                              DRM_BUS_FLAG_PIXDATA_POSEDGE);
 235         sig_cfg.bus_format = imx_crtc_state->bus_format;
 236         sig_cfg.v_to_h_sync = 0;
 237         sig_cfg.hsync_pin = imx_crtc_state->di_hsync_pin;
 238         sig_cfg.vsync_pin = imx_crtc_state->di_vsync_pin;
 239
 240         drm_display_mode_to_videomode(mode, &sig_cfg.mode);
 241
 242         ipu_dc_init_sync(ipu_crtc->dc, ipu_crtc->di,
 243                          mode->flags & DRM_MODE_FLAG_INTERLACE,
 244                          imx_crtc_state->bus_format, mode->hdisplay);
 245         ipu_di_init_sync_panel(ipu_crtc->di, &sig_cfg);
 246 }
 247
 248 static const struct drm_crtc_helper_funcs ipu_helper_funcs = {
 249         .mode_fixup = ipu_crtc_mode_fixup,
 250         .mode_set_nofb = ipu_crtc_mode_set_nofb,
 251         .atomic_check = ipu_crtc_atomic_check,
 252         .atomic_begin = ipu_crtc_atomic_begin,
 253         .atomic_disable = ipu_crtc_atomic_disable,
 254         .enable = ipu_crtc_enable,
 255 };
 256
 257 static int ipu_enable_vblank(struct drm_crtc *crtc)
 258 {
 259         struct ipu_crtc *ipu_crtc = to_ipu_crtc(crtc);
 260
 261         enable_irq(ipu_crtc->irq);
 262
 263         return 0;
 264 }
 265
 266 static void ipu_disable_vblank(struct drm_crtc *crtc)
 267 {
 268         struct ipu_crtc *ipu_crtc = to_ipu_crtc(crtc);
 269
 270         disable_irq_nosync(ipu_crtc->irq);
 271 }
 272
 273 static const struct imx_drm_crtc_helper_funcs ipu_crtc_helper_funcs = {
 274         .enable_vblank = ipu_enable_vblank,
 275         .disable_vblank = ipu_disable_vblank,
 276         .crtc_funcs = &ipu_crtc_funcs,
 277         .crtc_helper_funcs = &ipu_helper_funcs,
 278 };
 279
 280 static void ipu_put_resources(struct ipu_crtc *ipu_crtc)
 281 {
 282         if (!IS_ERR_OR_NULL(ipu_crtc->dc))
 283                 ipu_dc_put(ipu_crtc->dc);
 284         if (!IS_ERR_OR_NULL(ipu_crtc->di))
 285                 ipu_di_put(ipu_crtc->di);
 286 }
 287
 288 static int ipu_get_resources(struct ipu_crtc *ipu_crtc,
 289                 struct ipu_client_platformdata *pdata)
 290 {
 291         struct ipu_soc *ipu = dev_get_drvdata(ipu_crtc->dev->parent);
 292         int ret;
 293
 294         ipu_crtc->dc = ipu_dc_get(ipu, pdata->dc);
 295         if (IS_ERR(ipu_crtc->dc)) {
 296                 ret = PTR_ERR(ipu_crtc->dc);
 297                 goto err_out;
 298         }
 299
 300         ipu_crtc->di = ipu_di_get(ipu, pdata->di);
 301         if (IS_ERR(ipu_crtc->di)) {
 302                 ret = PTR_ERR(ipu_crtc->di);
 303                 goto err_out;
 304         }
 305
 306         return 0;
 307 err_out:
 308         ipu_put_resources(ipu_crtc);
 309
 310         return ret;
 311 }
 312
 313 static int ipu_crtc_init(struct ipu_crtc *ipu_crtc,
 314         struct ipu_client_platformdata *pdata, struct drm_device *drm)
 315 {
 316         struct ipu_soc *ipu = dev_get_drvdata(ipu_crtc->dev->parent);
 317         int dp = -EINVAL;
 318         int ret;
 319
 320         ret = ipu_get_resources(ipu_crtc, pdata);
 321         if (ret) {
 322                 dev_err(ipu_crtc->dev, "getting resources failed with %d.\n",
 323                                 ret);
 324                 return ret;
 325         }
 326
 327         if (pdata->dp >= 0)
 328                 dp = IPU_DP_FLOW_SYNC_BG;
 329         ipu_crtc->plane[0] = ipu_plane_init(drm, ipu, pdata->dma[0], dp, 0,
 330                                             DRM_PLANE_TYPE_PRIMARY);
 331         if (IS_ERR(ipu_crtc->plane[0])) {
 332                 ret = PTR_ERR(ipu_crtc->plane[0]);
 333                 goto err_put_resources;
 334         }
 335
 336         ret = imx_drm_add_crtc(drm, &ipu_crtc->base, &ipu_crtc->imx_crtc,
 337                         &ipu_crtc->plane[0]->base, &ipu_crtc_helper_funcs,
 338                         pdata->of_node);
 339         if (ret) {
 340                 dev_err(ipu_crtc->dev, "adding crtc failed with %d.\n", ret);
 341                 goto err_put_resources;
 342         }
 343
 344         ret = ipu_plane_get_resources(ipu_crtc->plane[0]);
 345         if (ret) {
 346                 dev_err(ipu_crtc->dev, "getting plane 0 resources failed with %d.\n",
 347                         ret);
 348                 goto err_remove_crtc;
 349         }
 350
 351         /* If this crtc is using the DP, add an overlay plane */
 352         if (pdata->dp >= 0 && pdata->dma[1] > 0) {
 353                 ipu_crtc->plane[1] = ipu_plane_init(drm, ipu, pdata->dma[1],
 354                                                 IPU_DP_FLOW_SYNC_FG,
 355                                                 drm_crtc_mask(&ipu_crtc->base),
 356                                                 DRM_PLANE_TYPE_OVERLAY);
 357                 if (IS_ERR(ipu_crtc->plane[1])) {
 358                         ipu_crtc->plane[1] = NULL;
 359                 } else {
 360                         ret = ipu_plane_get_resources(ipu_crtc->plane[1]);
 361                         if (ret) {
 362                                 dev_err(ipu_crtc->dev, "getting plane 1 "
 363                                         "resources failed with %d.\n", ret);
 364                                 goto err_put_plane0_res;
 365                         }
 366                 }
 367         }
 368
 369         ipu_crtc->irq = ipu_plane_irq(ipu_crtc->plane[0]);
 370         ret = devm_request_irq(ipu_crtc->dev, ipu_crtc->irq, ipu_irq_handler, 0,
 371                         "imx_drm", ipu_crtc);
 372         if (ret < 0) {
 373                 dev_err(ipu_crtc->dev, "irq request failed with %d.\n", ret);
 374                 goto err_put_plane1_res;
 375         }
 376         /* Only enable IRQ when we actually need it to trigger work. */
 377         disable_irq(ipu_crtc->irq);
 378
 379         return 0;
 380
 381 err_put_plane1_res:
 382         if (ipu_crtc->plane[1])
 383                 ipu_plane_put_resources(ipu_crtc->plane[1]);
 384 err_put_plane0_res:
 385         ipu_plane_put_resources(ipu_crtc->plane[0]);
 386 err_remove_crtc:
 387         imx_drm_remove_crtc(ipu_crtc->imx_crtc);
 388 err_put_resources:
 389         ipu_put_resources(ipu_crtc);
 390
 391         return ret;
 392 }
 393
 394 static int ipu_drm_bind(struct device *dev, struct device *master, void *data)
 395 {
 396         struct ipu_client_platformdata *pdata = dev->platform_data;
 397         struct drm_device *drm = data;
 398         struct ipu_crtc *ipu_crtc;
 399         int ret;
 400
 401         ipu_crtc = devm_kzalloc(dev, sizeof(*ipu_crtc), GFP_KERNEL);
 402         if (!ipu_crtc)
 403                 return -ENOMEM;
 404
 405         ipu_crtc->dev = dev;
 406
 407         ret = ipu_crtc_init(ipu_crtc, pdata, drm);
 408         if (ret)
 409                 return ret;
 410
 411         dev_set_drvdata(dev, ipu_crtc);
 412
 413         return 0;
 414 }
 415
 416 static void ipu_drm_unbind(struct device *dev, struct device *master,
 417         void *data)
 418 {
 419         struct ipu_crtc *ipu_crtc = dev_get_drvdata(dev);
 420
 421         ipu_put_resources(ipu_crtc);
 422         if (ipu_crtc->plane[1])
 423                 ipu_plane_put_resources(ipu_crtc->plane[1]);
 424         ipu_plane_put_resources(ipu_crtc->plane[0]);
 425 }
 426
 427 static const struct component_ops ipu_crtc_ops = {
 428         .bind = ipu_drm_bind,
 429         .unbind = ipu_drm_unbind,
 430 };
 431
 432 static int ipu_drm_probe(struct platform_device *pdev)
 433 {
 434         struct device *dev = &pdev->dev;
 435         int ret;
 436
 437         if (!dev->platform_data)
 438                 return -EINVAL;
 439
 440         ret = dma_set_coherent_mask(dev, DMA_BIT_MASK(32));
 441         if (ret)
 442                 return ret;
 443
 444         return component_add(dev, &ipu_crtc_ops);
 445 }
 446
 447 static int ipu_drm_remove(struct platform_device *pdev)
 448 {
 449         component_del(&pdev->dev, &ipu_crtc_ops);
 450         return 0;
 451 }
 452
 453 static struct platform_driver ipu_drm_driver = {
 454         .driver = {
 455                 .name = "imx-ipuv3-crtc",
 456         },
 457         .probe = ipu_drm_probe,
 458         .remove = ipu_drm_remove,
 459 };
 460 module_platform_driver(ipu_drm_driver);
 461
 462 MODULE_AUTHOR("Sascha Hauer <[email protected]>");
 463 MODULE_DESCRIPTION(DRIVER_DESC);
 464 MODULE_LICENSE("GPL");
 465 MODULE_ALIAS("platform:imx-ipuv3-crtc");