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_disable(struct drm_crtc *crtc)
  64 {
  65         struct ipu_crtc *ipu_crtc = to_ipu_crtc(crtc);
  66         struct ipu_soc *ipu = dev_get_drvdata(ipu_crtc->dev->parent);
  67
  68         ipu_dc_disable_channel(ipu_crtc->dc);
  69         ipu_di_disable(ipu_crtc->di);
  70         ipu_dc_disable(ipu);
  71
  72         spin_lock_irq(&crtc->dev->event_lock);
  73         if (crtc->state->event) {
  74                 drm_crtc_send_vblank_event(crtc, crtc->state->event);
  75                 crtc->state->event = NULL;
  76         }
  77         spin_unlock_irq(&crtc->dev->event_lock);
  78 }
  79
  80 static void imx_drm_crtc_reset(struct drm_crtc *crtc)
  81 {
  82         struct imx_crtc_state *state;
  83
  84         if (crtc->state) {
  85                 if (crtc->state->mode_blob)
  86                         drm_property_unreference_blob(crtc->state->mode_blob);
  87
  88                 state = to_imx_crtc_state(crtc->state);
  89                 memset(state, 0, sizeof(*state));
  90         } else {
  91                 state = kzalloc(sizeof(*state), GFP_KERNEL);
  92                 if (!state)
  93                         return;
  94                 crtc->state = &state->base;
  95         }
  96
  97         state->base.crtc = crtc;
  98 }
  99
 100 static struct drm_crtc_state *imx_drm_crtc_duplicate_state(struct drm_crtc *crtc)
 101 {
 102         struct imx_crtc_state *state;
 103
 104         state = kzalloc(sizeof(*state), GFP_KERNEL);
 105         if (!state)
 106                 return NULL;
 107
 108         __drm_atomic_helper_crtc_duplicate_state(crtc, &state->base);
 109
 110         WARN_ON(state->base.crtc != crtc);
 111         state->base.crtc = crtc;
 112
 113         return &state->base;
 114 }
 115
 116 static void imx_drm_crtc_destroy_state(struct drm_crtc *crtc,
 117                                        struct drm_crtc_state *state)
 118 {
 119         __drm_atomic_helper_crtc_destroy_state(state);
 120         kfree(to_imx_crtc_state(state));
 121 }
 122
 123 static const struct drm_crtc_funcs ipu_crtc_funcs = {
 124         .set_config = drm_atomic_helper_set_config,
 125         .destroy = drm_crtc_cleanup,
 126         .page_flip = drm_atomic_helper_page_flip,
 127         .reset = imx_drm_crtc_reset,
 128         .atomic_duplicate_state = imx_drm_crtc_duplicate_state,
 129         .atomic_destroy_state = imx_drm_crtc_destroy_state,
 130 };
 131
 132 static irqreturn_t ipu_irq_handler(int irq, void *dev_id)
 133 {
 134         struct ipu_crtc *ipu_crtc = dev_id;
 135
 136         drm_crtc_handle_vblank(&ipu_crtc->base);
 137
 138         return IRQ_HANDLED;
 139 }
 140
 141 static bool ipu_crtc_mode_fixup(struct drm_crtc *crtc,
 142                                   const struct drm_display_mode *mode,
 143                                   struct drm_display_mode *adjusted_mode)
 144 {
 145         struct ipu_crtc *ipu_crtc = to_ipu_crtc(crtc);
 146         struct videomode vm;
 147         int ret;
 148
 149         drm_display_mode_to_videomode(adjusted_mode, &vm);
 150
 151         ret = ipu_di_adjust_videomode(ipu_crtc->di, &vm);
 152         if (ret)
 153                 return false;
 154
 155         if ((vm.vsync_len == 0) || (vm.hsync_len == 0))
 156                 return false;
 157
 158         drm_display_mode_from_videomode(&vm, adjusted_mode);
 159
 160         return true;
 161 }
 162
 163 static int ipu_crtc_atomic_check(struct drm_crtc *crtc,
 164                                  struct drm_crtc_state *state)
 165 {
 166         u32 primary_plane_mask = 1 << drm_plane_index(crtc->primary);
 167
 168         if (state->active && (primary_plane_mask & state->plane_mask) == 0)
 169                 return -EINVAL;
 170
 171         return 0;
 172 }
 173
 174 static void ipu_crtc_atomic_begin(struct drm_crtc *crtc,
 175                                   struct drm_crtc_state *old_crtc_state)
 176 {
 177         spin_lock_irq(&crtc->dev->event_lock);
 178         if (crtc->state->event) {
 179                 WARN_ON(drm_crtc_vblank_get(crtc));
 180                 drm_crtc_arm_vblank_event(crtc, crtc->state->event);
 181                 crtc->state->event = NULL;
 182         }
 183         spin_unlock_irq(&crtc->dev->event_lock);
 184 }
 185
 186 static void ipu_crtc_mode_set_nofb(struct drm_crtc *crtc)
 187 {
 188         struct drm_device *dev = crtc->dev;
 189         struct drm_encoder *encoder;
 190         struct ipu_crtc *ipu_crtc = to_ipu_crtc(crtc);
 191         struct drm_display_mode *mode = &crtc->state->adjusted_mode;
 192         struct imx_crtc_state *imx_crtc_state = to_imx_crtc_state(crtc->state);
 193         struct ipu_di_signal_cfg sig_cfg = {};
 194         unsigned long encoder_types = 0;
 195
 196         dev_dbg(ipu_crtc->dev, "%s: mode->hdisplay: %d\n", __func__,
 197                         mode->hdisplay);
 198         dev_dbg(ipu_crtc->dev, "%s: mode->vdisplay: %d\n", __func__,
 199                         mode->vdisplay);
 200
 201         list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
 202                 if (encoder->crtc == crtc)
 203                         encoder_types |= BIT(encoder->encoder_type);
 204         }
 205
 206         dev_dbg(ipu_crtc->dev, "%s: attached to encoder types 0x%lx\n",
 207                 __func__, encoder_types);
 208
 209         /*
 210          * If we have DAC or LDB, then we need the IPU DI clock to be
 211          * the same as the LDB DI clock. For TVDAC, derive the IPU DI
 212          * clock from 27 MHz TVE_DI clock, but allow to divide it.
 213          */
 214         if (encoder_types & (BIT(DRM_MODE_ENCODER_DAC) |
 215                              BIT(DRM_MODE_ENCODER_LVDS)))
 216                 sig_cfg.clkflags = IPU_DI_CLKMODE_SYNC | IPU_DI_CLKMODE_EXT;
 217         else if (encoder_types & BIT(DRM_MODE_ENCODER_TVDAC))
 218                 sig_cfg.clkflags = IPU_DI_CLKMODE_EXT;
 219         else
 220                 sig_cfg.clkflags = 0;
 221
 222         sig_cfg.enable_pol = !(imx_crtc_state->bus_flags & DRM_BUS_FLAG_DE_LOW);
 223         /* Default to driving pixel data on negative clock edges */
 224         sig_cfg.clk_pol = !!(imx_crtc_state->bus_flags &
 225                              DRM_BUS_FLAG_PIXDATA_POSEDGE);
 226         sig_cfg.bus_format = imx_crtc_state->bus_format;
 227         sig_cfg.v_to_h_sync = 0;
 228         sig_cfg.hsync_pin = imx_crtc_state->di_hsync_pin;
 229         sig_cfg.vsync_pin = imx_crtc_state->di_vsync_pin;
 230
 231         drm_display_mode_to_videomode(mode, &sig_cfg.mode);
 232
 233         ipu_dc_init_sync(ipu_crtc->dc, ipu_crtc->di,
 234                          mode->flags & DRM_MODE_FLAG_INTERLACE,
 235                          imx_crtc_state->bus_format, mode->hdisplay);
 236         ipu_di_init_sync_panel(ipu_crtc->di, &sig_cfg);
 237 }
 238
 239 static const struct drm_crtc_helper_funcs ipu_helper_funcs = {
 240         .mode_fixup = ipu_crtc_mode_fixup,
 241         .mode_set_nofb = ipu_crtc_mode_set_nofb,
 242         .atomic_check = ipu_crtc_atomic_check,
 243         .atomic_begin = ipu_crtc_atomic_begin,
 244         .disable = ipu_crtc_disable,
 245         .enable = ipu_crtc_enable,
 246 };
 247
 248 static int ipu_enable_vblank(struct drm_crtc *crtc)
 249 {
 250         struct ipu_crtc *ipu_crtc = to_ipu_crtc(crtc);
 251
 252         enable_irq(ipu_crtc->irq);
 253
 254         return 0;
 255 }
 256
 257 static void ipu_disable_vblank(struct drm_crtc *crtc)
 258 {
 259         struct ipu_crtc *ipu_crtc = to_ipu_crtc(crtc);
 260
 261         disable_irq_nosync(ipu_crtc->irq);
 262 }
 263
 264 static const struct imx_drm_crtc_helper_funcs ipu_crtc_helper_funcs = {
 265         .enable_vblank = ipu_enable_vblank,
 266         .disable_vblank = ipu_disable_vblank,
 267         .crtc_funcs = &ipu_crtc_funcs,
 268         .crtc_helper_funcs = &ipu_helper_funcs,
 269 };
 270
 271 static void ipu_put_resources(struct ipu_crtc *ipu_crtc)
 272 {
 273         if (!IS_ERR_OR_NULL(ipu_crtc->dc))
 274                 ipu_dc_put(ipu_crtc->dc);
 275         if (!IS_ERR_OR_NULL(ipu_crtc->di))
 276                 ipu_di_put(ipu_crtc->di);
 277 }
 278
 279 static int ipu_get_resources(struct ipu_crtc *ipu_crtc,
 280                 struct ipu_client_platformdata *pdata)
 281 {
 282         struct ipu_soc *ipu = dev_get_drvdata(ipu_crtc->dev->parent);
 283         int ret;
 284
 285         ipu_crtc->dc = ipu_dc_get(ipu, pdata->dc);
 286         if (IS_ERR(ipu_crtc->dc)) {
 287                 ret = PTR_ERR(ipu_crtc->dc);
 288                 goto err_out;
 289         }
 290
 291         ipu_crtc->di = ipu_di_get(ipu, pdata->di);
 292         if (IS_ERR(ipu_crtc->di)) {
 293                 ret = PTR_ERR(ipu_crtc->di);
 294                 goto err_out;
 295         }
 296
 297         return 0;
 298 err_out:
 299         ipu_put_resources(ipu_crtc);
 300
 301         return ret;
 302 }
 303
 304 static int ipu_crtc_init(struct ipu_crtc *ipu_crtc,
 305         struct ipu_client_platformdata *pdata, struct drm_device *drm)
 306 {
 307         struct ipu_soc *ipu = dev_get_drvdata(ipu_crtc->dev->parent);
 308         int dp = -EINVAL;
 309         int ret;
 310
 311         ret = ipu_get_resources(ipu_crtc, pdata);
 312         if (ret) {
 313                 dev_err(ipu_crtc->dev, "getting resources failed with %d.\n",
 314                                 ret);
 315                 return ret;
 316         }
 317
 318         if (pdata->dp >= 0)
 319                 dp = IPU_DP_FLOW_SYNC_BG;
 320         ipu_crtc->plane[0] = ipu_plane_init(drm, ipu, pdata->dma[0], dp, 0,
 321                                             DRM_PLANE_TYPE_PRIMARY);
 322         if (IS_ERR(ipu_crtc->plane[0])) {
 323                 ret = PTR_ERR(ipu_crtc->plane[0]);
 324                 goto err_put_resources;
 325         }
 326
 327         ret = imx_drm_add_crtc(drm, &ipu_crtc->base, &ipu_crtc->imx_crtc,
 328                         &ipu_crtc->plane[0]->base, &ipu_crtc_helper_funcs,
 329                         pdata->of_node);
 330         if (ret) {
 331                 dev_err(ipu_crtc->dev, "adding crtc failed with %d.\n", ret);
 332                 goto err_put_resources;
 333         }
 334
 335         ret = ipu_plane_get_resources(ipu_crtc->plane[0]);
 336         if (ret) {
 337                 dev_err(ipu_crtc->dev, "getting plane 0 resources failed with %d.\n",
 338                         ret);
 339                 goto err_remove_crtc;
 340         }
 341
 342         /* If this crtc is using the DP, add an overlay plane */
 343         if (pdata->dp >= 0 && pdata->dma[1] > 0) {
 344                 ipu_crtc->plane[1] = ipu_plane_init(drm, ipu, pdata->dma[1],
 345                                                 IPU_DP_FLOW_SYNC_FG,
 346                                                 drm_crtc_mask(&ipu_crtc->base),
 347                                                 DRM_PLANE_TYPE_OVERLAY);
 348                 if (IS_ERR(ipu_crtc->plane[1])) {
 349                         ipu_crtc->plane[1] = NULL;
 350                 } else {
 351                         ret = ipu_plane_get_resources(ipu_crtc->plane[1]);
 352                         if (ret) {
 353                                 dev_err(ipu_crtc->dev, "getting plane 1 "
 354                                         "resources failed with %d.\n", ret);
 355                                 goto err_put_plane0_res;
 356                         }
 357                 }
 358         }
 359
 360         ipu_crtc->irq = ipu_plane_irq(ipu_crtc->plane[0]);
 361         ret = devm_request_irq(ipu_crtc->dev, ipu_crtc->irq, ipu_irq_handler, 0,
 362                         "imx_drm", ipu_crtc);
 363         if (ret < 0) {
 364                 dev_err(ipu_crtc->dev, "irq request failed with %d.\n", ret);
 365                 goto err_put_plane1_res;
 366         }
 367         /* Only enable IRQ when we actually need it to trigger work. */
 368         disable_irq(ipu_crtc->irq);
 369
 370         return 0;
 371
 372 err_put_plane1_res:
 373         if (ipu_crtc->plane[1])
 374                 ipu_plane_put_resources(ipu_crtc->plane[1]);
 375 err_put_plane0_res:
 376         ipu_plane_put_resources(ipu_crtc->plane[0]);
 377 err_remove_crtc:
 378         imx_drm_remove_crtc(ipu_crtc->imx_crtc);
 379 err_put_resources:
 380         ipu_put_resources(ipu_crtc);
 381
 382         return ret;
 383 }
 384
 385 static int ipu_drm_bind(struct device *dev, struct device *master, void *data)
 386 {
 387         struct ipu_client_platformdata *pdata = dev->platform_data;
 388         struct drm_device *drm = data;
 389         struct ipu_crtc *ipu_crtc;
 390         int ret;
 391
 392         ipu_crtc = devm_kzalloc(dev, sizeof(*ipu_crtc), GFP_KERNEL);
 393         if (!ipu_crtc)
 394                 return -ENOMEM;
 395
 396         ipu_crtc->dev = dev;
 397
 398         ret = ipu_crtc_init(ipu_crtc, pdata, drm);
 399         if (ret)
 400                 return ret;
 401
 402         dev_set_drvdata(dev, ipu_crtc);
 403
 404         return 0;
 405 }
 406
 407 static void ipu_drm_unbind(struct device *dev, struct device *master,
 408         void *data)
 409 {
 410         struct ipu_crtc *ipu_crtc = dev_get_drvdata(dev);
 411
 412         imx_drm_remove_crtc(ipu_crtc->imx_crtc);
 413
 414         ipu_put_resources(ipu_crtc);
 415         if (ipu_crtc->plane[1])
 416                 ipu_plane_put_resources(ipu_crtc->plane[1]);
 417         ipu_plane_put_resources(ipu_crtc->plane[0]);
 418 }
 419
 420 static const struct component_ops ipu_crtc_ops = {
 421         .bind = ipu_drm_bind,
 422         .unbind = ipu_drm_unbind,
 423 };
 424
 425 static int ipu_drm_probe(struct platform_device *pdev)
 426 {
 427         struct device *dev = &pdev->dev;
 428         int ret;
 429
 430         if (!dev->platform_data)
 431                 return -EINVAL;
 432
 433         ret = dma_set_coherent_mask(dev, DMA_BIT_MASK(32));
 434         if (ret)
 435                 return ret;
 436
 437         return component_add(dev, &ipu_crtc_ops);
 438 }
 439
 440 static int ipu_drm_remove(struct platform_device *pdev)
 441 {
 442         component_del(&pdev->dev, &ipu_crtc_ops);
 443         return 0;
 444 }
 445
 446 static struct platform_driver ipu_drm_driver = {
 447         .driver = {
 448                 .name = "imx-ipuv3-crtc",
 449         },
 450         .probe = ipu_drm_probe,
 451         .remove = ipu_drm_remove,
 452 };
 453 module_platform_driver(ipu_drm_driver);
 454
 455 MODULE_AUTHOR("Sascha Hauer <s.hauer@pengutronix.de>");
 456 MODULE_DESCRIPTION(DRIVER_DESC);
 457 MODULE_LICENSE("GPL");
 458 MODULE_ALIAS("platform:imx-ipuv3-crtc");