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