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/fb.h>
  25 #include <linux/clk.h>
  26 #include <linux/errno.h>
  27 #include <drm/drm_gem_cma_helper.h>
  28 #include <drm/drm_fb_cma_helper.h>
  29
  30 #include <video/imx-ipu-v3.h>
  31 #include "imx-drm.h"
  32 #include "ipuv3-plane.h"
  33
  34 #define DRIVER_DESC             "i.MX IPUv3 Graphics"
  35
  36 struct ipu_crtc {
  37         struct device           *dev;
  38         struct drm_crtc         base;
  39         struct imx_drm_crtc     *imx_crtc;
  40
  41         /* plane[0] is the full plane, plane[1] is the partial plane */
  42         struct ipu_plane        *plane[2];
  43
  44         struct ipu_dc           *dc;
  45         struct ipu_di           *di;
  46         int                     irq;
  47 };
  48
  49 static inline struct ipu_crtc *to_ipu_crtc(struct drm_crtc *crtc)
  50 {
  51         return container_of(crtc, struct ipu_crtc, base);
  52 }
  53
  54 static void ipu_crtc_enable(struct drm_crtc *crtc)
  55 {
  56         struct ipu_crtc *ipu_crtc = to_ipu_crtc(crtc);
  57         struct ipu_soc *ipu = dev_get_drvdata(ipu_crtc->dev->parent);
  58
  59         ipu_dc_enable(ipu);
  60         ipu_dc_enable_channel(ipu_crtc->dc);
  61         ipu_di_enable(ipu_crtc->di);
  62 }
  63
  64 static void ipu_crtc_disable(struct drm_crtc *crtc)
  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         drm_crtc_vblank_off(crtc);
  81 }
  82
  83 static void imx_drm_crtc_reset(struct drm_crtc *crtc)
  84 {
  85         struct imx_crtc_state *state;
  86
  87         if (crtc->state) {
  88                 if (crtc->state->mode_blob)
  89                         drm_property_unreference_blob(crtc->state->mode_blob);
  90
  91                 state = to_imx_crtc_state(crtc->state);
  92                 memset(state, 0, sizeof(*state));
  93         } else {
  94                 state = kzalloc(sizeof(*state), GFP_KERNEL);
  95                 if (!state)
  96                         return;
  97                 crtc->state = &state->base;
  98         }
  99
 100         state->base.crtc = crtc;
 101 }
 102
 103 static struct drm_crtc_state *imx_drm_crtc_duplicate_state(struct drm_crtc *crtc)
 104 {
 105         struct imx_crtc_state *state;
 106
 107         state = kzalloc(sizeof(*state), GFP_KERNEL);
 108         if (!state)
 109                 return NULL;
 110
 111         __drm_atomic_helper_crtc_duplicate_state(crtc, &state->base);
 112
 113         WARN_ON(state->base.crtc != crtc);
 114         state->base.crtc = crtc;
 115
 116         return &state->base;
 117 }
 118
 119 static void imx_drm_crtc_destroy_state(struct drm_crtc *crtc,
 120                                        struct drm_crtc_state *state)
 121 {
 122         __drm_atomic_helper_crtc_destroy_state(state);
 123         kfree(to_imx_crtc_state(state));
 124 }
 125
 126 static const struct drm_crtc_funcs ipu_crtc_funcs = {
 127         .set_config = drm_atomic_helper_set_config,
 128         .destroy = drm_crtc_cleanup,
 129         .page_flip = drm_atomic_helper_page_flip,
 130         .reset = imx_drm_crtc_reset,
 131         .atomic_duplicate_state = imx_drm_crtc_duplicate_state,
 132         .atomic_destroy_state = imx_drm_crtc_destroy_state,
 133 };
 134
 135 static irqreturn_t ipu_irq_handler(int irq, void *dev_id)
 136 {
 137         struct ipu_crtc *ipu_crtc = dev_id;
 138
 139         imx_drm_handle_vblank(ipu_crtc->imx_crtc);
 140
 141         return IRQ_HANDLED;
 142 }
 143
 144 static bool ipu_crtc_mode_fixup(struct drm_crtc *crtc,
 145                                   const struct drm_display_mode *mode,
 146                                   struct drm_display_mode *adjusted_mode)
 147 {
 148         struct ipu_crtc *ipu_crtc = to_ipu_crtc(crtc);
 149         struct videomode vm;
 150         int ret;
 151
 152         drm_display_mode_to_videomode(adjusted_mode, &vm);
 153
 154         ret = ipu_di_adjust_videomode(ipu_crtc->di, &vm);
 155         if (ret)
 156                 return false;
 157
 158         if ((vm.vsync_len == 0) || (vm.hsync_len == 0))
 159                 return false;
 160
 161         drm_display_mode_from_videomode(&vm, adjusted_mode);
 162
 163         return true;
 164 }
 165
 166 static int ipu_crtc_atomic_check(struct drm_crtc *crtc,
 167                                  struct drm_crtc_state *state)
 168 {
 169         u32 primary_plane_mask = 1 << drm_plane_index(crtc->primary);
 170
 171         if (state->active && (primary_plane_mask & state->plane_mask) == 0)
 172                 return -EINVAL;
 173
 174         return 0;
 175 }
 176
 177 static void ipu_crtc_atomic_begin(struct drm_crtc *crtc,
 178                                   struct drm_crtc_state *old_crtc_state)
 179 {
 180         drm_crtc_vblank_on(crtc);
 181
 182         spin_lock_irq(&crtc->dev->event_lock);
 183         if (crtc->state->event) {
 184                 WARN_ON(drm_crtc_vblank_get(crtc));
 185                 drm_crtc_arm_vblank_event(crtc, crtc->state->event);
 186                 crtc->state->event = NULL;
 187         }
 188         spin_unlock_irq(&crtc->dev->event_lock);
 189 }
 190
 191 static void ipu_crtc_mode_set_nofb(struct drm_crtc *crtc)
 192 {
 193         struct drm_device *dev = crtc->dev;
 194         struct drm_encoder *encoder;
 195         struct ipu_crtc *ipu_crtc = to_ipu_crtc(crtc);
 196         struct drm_display_mode *mode = &crtc->state->adjusted_mode;
 197         struct imx_crtc_state *imx_crtc_state = to_imx_crtc_state(crtc->state);
 198         struct ipu_di_signal_cfg sig_cfg = {};
 199         unsigned long encoder_types = 0;
 200
 201         dev_dbg(ipu_crtc->dev, "%s: mode->hdisplay: %d\n", __func__,
 202                         mode->hdisplay);
 203         dev_dbg(ipu_crtc->dev, "%s: mode->vdisplay: %d\n", __func__,
 204                         mode->vdisplay);
 205
 206         list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
 207                 if (encoder->crtc == crtc)
 208                         encoder_types |= BIT(encoder->encoder_type);
 209         }
 210
 211         dev_dbg(ipu_crtc->dev, "%s: attached to encoder types 0x%lx\n",
 212                 __func__, encoder_types);
 213
 214         /*
 215          * If we have DAC or LDB, then we need the IPU DI clock to be
 216          * the same as the LDB DI clock. For TVDAC, derive the IPU DI
 217          * clock from 27 MHz TVE_DI clock, but allow to divide it.
 218          */
 219         if (encoder_types & (BIT(DRM_MODE_ENCODER_DAC) |
 220                              BIT(DRM_MODE_ENCODER_LVDS)))
 221                 sig_cfg.clkflags = IPU_DI_CLKMODE_SYNC | IPU_DI_CLKMODE_EXT;
 222         else if (encoder_types & BIT(DRM_MODE_ENCODER_TVDAC))
 223                 sig_cfg.clkflags = IPU_DI_CLKMODE_EXT;
 224         else
 225                 sig_cfg.clkflags = 0;
 226
 227         sig_cfg.enable_pol = !(imx_crtc_state->bus_flags & DRM_BUS_FLAG_DE_LOW);
 228         /* Default to driving pixel data on negative clock edges */
 229         sig_cfg.clk_pol = !!(imx_crtc_state->bus_flags &
 230                              DRM_BUS_FLAG_PIXDATA_POSEDGE);
 231         sig_cfg.bus_format = imx_crtc_state->bus_format;
 232         sig_cfg.v_to_h_sync = 0;
 233         sig_cfg.hsync_pin = imx_crtc_state->di_hsync_pin;
 234         sig_cfg.vsync_pin = imx_crtc_state->di_vsync_pin;
 235
 236         drm_display_mode_to_videomode(mode, &sig_cfg.mode);
 237
 238         ipu_dc_init_sync(ipu_crtc->dc, ipu_crtc->di,
 239                          mode->flags & DRM_MODE_FLAG_INTERLACE,
 240                          imx_crtc_state->bus_format, mode->hdisplay);
 241         ipu_di_init_sync_panel(ipu_crtc->di, &sig_cfg);
 242 }
 243
 244 static const struct drm_crtc_helper_funcs ipu_helper_funcs = {
 245         .mode_fixup = ipu_crtc_mode_fixup,
 246         .mode_set_nofb = ipu_crtc_mode_set_nofb,
 247         .atomic_check = ipu_crtc_atomic_check,
 248         .atomic_begin = ipu_crtc_atomic_begin,
 249         .disable = ipu_crtc_disable,
 250         .enable = ipu_crtc_enable,
 251 };
 252
 253 static int ipu_enable_vblank(struct drm_crtc *crtc)
 254 {
 255         struct ipu_crtc *ipu_crtc = to_ipu_crtc(crtc);
 256
 257         enable_irq(ipu_crtc->irq);
 258
 259         return 0;
 260 }
 261
 262 static void ipu_disable_vblank(struct drm_crtc *crtc)
 263 {
 264         struct ipu_crtc *ipu_crtc = to_ipu_crtc(crtc);
 265
 266         disable_irq_nosync(ipu_crtc->irq);
 267 }
 268
 269 static const struct imx_drm_crtc_helper_funcs ipu_crtc_helper_funcs = {
 270         .enable_vblank = ipu_enable_vblank,
 271         .disable_vblank = ipu_disable_vblank,
 272         .crtc_funcs = &ipu_crtc_funcs,
 273         .crtc_helper_funcs = &ipu_helper_funcs,
 274 };
 275
 276 static void ipu_put_resources(struct ipu_crtc *ipu_crtc)
 277 {
 278         if (!IS_ERR_OR_NULL(ipu_crtc->dc))
 279                 ipu_dc_put(ipu_crtc->dc);
 280         if (!IS_ERR_OR_NULL(ipu_crtc->di))
 281                 ipu_di_put(ipu_crtc->di);
 282 }
 283
 284 static int ipu_get_resources(struct ipu_crtc *ipu_crtc,
 285                 struct ipu_client_platformdata *pdata)
 286 {
 287         struct ipu_soc *ipu = dev_get_drvdata(ipu_crtc->dev->parent);
 288         int ret;
 289
 290         ipu_crtc->dc = ipu_dc_get(ipu, pdata->dc);
 291         if (IS_ERR(ipu_crtc->dc)) {
 292                 ret = PTR_ERR(ipu_crtc->dc);
 293                 goto err_out;
 294         }
 295
 296         ipu_crtc->di = ipu_di_get(ipu, pdata->di);
 297         if (IS_ERR(ipu_crtc->di)) {
 298                 ret = PTR_ERR(ipu_crtc->di);
 299                 goto err_out;
 300         }
 301
 302         return 0;
 303 err_out:
 304         ipu_put_resources(ipu_crtc);
 305
 306         return ret;
 307 }
 308
 309 static int ipu_crtc_init(struct ipu_crtc *ipu_crtc,
 310         struct ipu_client_platformdata *pdata, struct drm_device *drm)
 311 {
 312         struct ipu_soc *ipu = dev_get_drvdata(ipu_crtc->dev->parent);
 313         int dp = -EINVAL;
 314         int ret;
 315
 316         ret = ipu_get_resources(ipu_crtc, pdata);
 317         if (ret) {
 318                 dev_err(ipu_crtc->dev, "getting resources failed with %d.\n",
 319                                 ret);
 320                 return ret;
 321         }
 322
 323         if (pdata->dp >= 0)
 324                 dp = IPU_DP_FLOW_SYNC_BG;
 325         ipu_crtc->plane[0] = ipu_plane_init(drm, ipu, pdata->dma[0], dp, 0,
 326                                             DRM_PLANE_TYPE_PRIMARY);
 327         if (IS_ERR(ipu_crtc->plane[0])) {
 328                 ret = PTR_ERR(ipu_crtc->plane[0]);
 329                 goto err_put_resources;
 330         }
 331
 332         ret = imx_drm_add_crtc(drm, &ipu_crtc->base, &ipu_crtc->imx_crtc,
 333                         &ipu_crtc->plane[0]->base, &ipu_crtc_helper_funcs,
 334                         pdata->of_node);
 335         if (ret) {
 336                 dev_err(ipu_crtc->dev, "adding crtc failed with %d.\n", ret);
 337                 goto err_put_resources;
 338         }
 339
 340         ret = ipu_plane_get_resources(ipu_crtc->plane[0]);
 341         if (ret) {
 342                 dev_err(ipu_crtc->dev, "getting plane 0 resources failed with %d.\n",
 343                         ret);
 344                 goto err_remove_crtc;
 345         }
 346
 347         /* If this crtc is using the DP, add an overlay plane */
 348         if (pdata->dp >= 0 && pdata->dma[1] > 0) {
 349                 ipu_crtc->plane[1] = ipu_plane_init(drm, ipu, pdata->dma[1],
 350                                                 IPU_DP_FLOW_SYNC_FG,
 351                                                 drm_crtc_mask(&ipu_crtc->base),
 352                                                 DRM_PLANE_TYPE_OVERLAY);
 353                 if (IS_ERR(ipu_crtc->plane[1])) {
 354                         ipu_crtc->plane[1] = NULL;
 355                 } else {
 356                         ret = ipu_plane_get_resources(ipu_crtc->plane[1]);
 357                         if (ret) {
 358                                 dev_err(ipu_crtc->dev, "getting plane 1 "
 359                                         "resources failed with %d.\n", ret);
 360                                 goto err_put_plane0_res;
 361                         }
 362                 }
 363         }
 364
 365         ipu_crtc->irq = ipu_plane_irq(ipu_crtc->plane[0]);
 366         ret = devm_request_irq(ipu_crtc->dev, ipu_crtc->irq, ipu_irq_handler, 0,
 367                         "imx_drm", ipu_crtc);
 368         if (ret < 0) {
 369                 dev_err(ipu_crtc->dev, "irq request failed with %d.\n", ret);
 370                 goto err_put_plane1_res;
 371         }
 372         /* Only enable IRQ when we actually need it to trigger work. */
 373         disable_irq(ipu_crtc->irq);
 374
 375         return 0;
 376
 377 err_put_plane1_res:
 378         if (ipu_crtc->plane[1])
 379                 ipu_plane_put_resources(ipu_crtc->plane[1]);
 380 err_put_plane0_res:
 381         ipu_plane_put_resources(ipu_crtc->plane[0]);
 382 err_remove_crtc:
 383         imx_drm_remove_crtc(ipu_crtc->imx_crtc);
 384 err_put_resources:
 385         ipu_put_resources(ipu_crtc);
 386
 387         return ret;
 388 }
 389
 390 static int ipu_drm_bind(struct device *dev, struct device *master, void *data)
 391 {
 392         struct ipu_client_platformdata *pdata = dev->platform_data;
 393         struct drm_device *drm = data;
 394         struct ipu_crtc *ipu_crtc;
 395         int ret;
 396
 397         ipu_crtc = devm_kzalloc(dev, sizeof(*ipu_crtc), GFP_KERNEL);
 398         if (!ipu_crtc)
 399                 return -ENOMEM;
 400
 401         ipu_crtc->dev = dev;
 402
 403         ret = ipu_crtc_init(ipu_crtc, pdata, drm);
 404         if (ret)
 405                 return ret;
 406
 407         dev_set_drvdata(dev, ipu_crtc);
 408
 409         return 0;
 410 }
 411
 412 static void ipu_drm_unbind(struct device *dev, struct device *master,
 413         void *data)
 414 {
 415         struct ipu_crtc *ipu_crtc = dev_get_drvdata(dev);
 416
 417         imx_drm_remove_crtc(ipu_crtc->imx_crtc);
 418
 419         ipu_put_resources(ipu_crtc);
 420         if (ipu_crtc->plane[1])
 421                 ipu_plane_put_resources(ipu_crtc->plane[1]);
 422         ipu_plane_put_resources(ipu_crtc->plane[0]);
 423 }
 424
 425 static const struct component_ops ipu_crtc_ops = {
 426         .bind = ipu_drm_bind,
 427         .unbind = ipu_drm_unbind,
 428 };
 429
 430 static int ipu_drm_probe(struct platform_device *pdev)
 431 {
 432         struct device *dev = &pdev->dev;
 433         int ret;
 434
 435         if (!dev->platform_data)
 436                 return -EINVAL;
 437
 438         ret = dma_set_coherent_mask(dev, DMA_BIT_MASK(32));
 439         if (ret)
 440                 return ret;
 441
 442         return component_add(dev, &ipu_crtc_ops);
 443 }
 444
 445 static int ipu_drm_remove(struct platform_device *pdev)
 446 {
 447         component_del(&pdev->dev, &ipu_crtc_ops);
 448         return 0;
 449 }
 450
 451 static struct platform_driver ipu_drm_driver = {
 452         .driver = {
 453                 .name = "imx-ipuv3-crtc",
 454         },
 455         .probe = ipu_drm_probe,
 456         .remove = ipu_drm_remove,
 457 };
 458 module_platform_driver(ipu_drm_driver);
 459
 460 MODULE_AUTHOR("Sascha Hauer <s.hauer@pengutronix.de>");
 461 MODULE_DESCRIPTION(DRIVER_DESC);
 462 MODULE_LICENSE("GPL");
 463 MODULE_ALIAS("platform:imx-ipuv3-crtc");