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 #define to_ipu_crtc(x) container_of(x, struct ipu_crtc, base)
  50
  51 static void ipu_crtc_enable(struct drm_crtc *crtc)
  52 {
  53         struct ipu_crtc *ipu_crtc = to_ipu_crtc(crtc);
  54         struct ipu_soc *ipu = dev_get_drvdata(ipu_crtc->dev->parent);
  55
  56         ipu_dc_enable(ipu);
  57         ipu_dc_enable_channel(ipu_crtc->dc);
  58         ipu_di_enable(ipu_crtc->di);
  59 }
  60
  61 static void ipu_crtc_disable(struct drm_crtc *crtc)
  62 {
  63         struct ipu_crtc *ipu_crtc = to_ipu_crtc(crtc);
  64         struct ipu_soc *ipu = dev_get_drvdata(ipu_crtc->dev->parent);
  65
  66         ipu_dc_disable_channel(ipu_crtc->dc);
  67         ipu_di_disable(ipu_crtc->di);
  68         ipu_dc_disable(ipu);
  69
  70         spin_lock_irq(&crtc->dev->event_lock);
  71         if (crtc->state->event) {
  72                 drm_crtc_send_vblank_event(crtc, crtc->state->event);
  73                 crtc->state->event = NULL;
  74         }
  75         spin_unlock_irq(&crtc->dev->event_lock);
  76 }
  77
  78 static void imx_drm_crtc_reset(struct drm_crtc *crtc)
  79 {
  80         struct imx_crtc_state *state;
  81
  82         if (crtc->state) {
  83                 if (crtc->state->mode_blob)
  84                         drm_property_unreference_blob(crtc->state->mode_blob);
  85
  86                 state = to_imx_crtc_state(crtc->state);
  87                 memset(state, 0, sizeof(*state));
  88         } else {
  89                 state = kzalloc(sizeof(*state), GFP_KERNEL);
  90                 if (!state)
  91                         return;
  92                 crtc->state = &state->base;
  93         }
  94
  95         state->base.crtc = crtc;
  96 }
  97
  98 static struct drm_crtc_state *imx_drm_crtc_duplicate_state(struct drm_crtc *crtc)
  99 {
 100         struct imx_crtc_state *state;
 101
 102         state = kzalloc(sizeof(*state), GFP_KERNEL);
 103         if (!state)
 104                 return NULL;
 105
 106         __drm_atomic_helper_crtc_duplicate_state(crtc, &state->base);
 107
 108         WARN_ON(state->base.crtc != crtc);
 109         state->base.crtc = crtc;
 110
 111         return &state->base;
 112 }
 113
 114 static void imx_drm_crtc_destroy_state(struct drm_crtc *crtc,
 115                                        struct drm_crtc_state *state)
 116 {
 117         __drm_atomic_helper_crtc_destroy_state(state);
 118         kfree(to_imx_crtc_state(state));
 119 }
 120
 121 static const struct drm_crtc_funcs ipu_crtc_funcs = {
 122         .set_config = drm_atomic_helper_set_config,
 123         .destroy = drm_crtc_cleanup,
 124         .page_flip = drm_atomic_helper_page_flip,
 125         .reset = imx_drm_crtc_reset,
 126         .atomic_duplicate_state = imx_drm_crtc_duplicate_state,
 127         .atomic_destroy_state = imx_drm_crtc_destroy_state,
 128 };
 129
 130 static irqreturn_t ipu_irq_handler(int irq, void *dev_id)
 131 {
 132         struct ipu_crtc *ipu_crtc = dev_id;
 133
 134         imx_drm_handle_vblank(ipu_crtc->imx_crtc);
 135
 136         return IRQ_HANDLED;
 137 }
 138
 139 static bool ipu_crtc_mode_fixup(struct drm_crtc *crtc,
 140                                   const struct drm_display_mode *mode,
 141                                   struct drm_display_mode *adjusted_mode)
 142 {
 143         struct ipu_crtc *ipu_crtc = to_ipu_crtc(crtc);
 144         struct videomode vm;
 145         int ret;
 146
 147         drm_display_mode_to_videomode(adjusted_mode, &vm);
 148
 149         ret = ipu_di_adjust_videomode(ipu_crtc->di, &vm);
 150         if (ret)
 151                 return false;
 152
 153         if ((vm.vsync_len == 0) || (vm.hsync_len == 0))
 154                 return false;
 155
 156         drm_display_mode_from_videomode(&vm, adjusted_mode);
 157
 158         return true;
 159 }
 160
 161 static int ipu_crtc_atomic_check(struct drm_crtc *crtc,
 162                                  struct drm_crtc_state *state)
 163 {
 164         u32 primary_plane_mask = 1 << drm_plane_index(crtc->primary);
 165
 166         if (state->active && (primary_plane_mask & state->plane_mask) == 0)
 167                 return -EINVAL;
 168
 169         return 0;
 170 }
 171
 172 static void ipu_crtc_atomic_begin(struct drm_crtc *crtc,
 173                                   struct drm_crtc_state *old_crtc_state)
 174 {
 175         spin_lock_irq(&crtc->dev->event_lock);
 176         if (crtc->state->event) {
 177                 WARN_ON(drm_crtc_vblank_get(crtc));
 178                 drm_crtc_arm_vblank_event(crtc, crtc->state->event);
 179                 crtc->state->event = NULL;
 180         }
 181         spin_unlock_irq(&crtc->dev->event_lock);
 182 }
 183
 184 static void ipu_crtc_mode_set_nofb(struct drm_crtc *crtc)
 185 {
 186         struct drm_device *dev = crtc->dev;
 187         struct drm_encoder *encoder;
 188         struct ipu_crtc *ipu_crtc = to_ipu_crtc(crtc);
 189         struct drm_display_mode *mode = &crtc->state->adjusted_mode;
 190         struct imx_crtc_state *imx_crtc_state = to_imx_crtc_state(crtc->state);
 191         struct ipu_di_signal_cfg sig_cfg = {};
 192         unsigned long encoder_types = 0;
 193
 194         dev_dbg(ipu_crtc->dev, "%s: mode->hdisplay: %d\n", __func__,
 195                         mode->hdisplay);
 196         dev_dbg(ipu_crtc->dev, "%s: mode->vdisplay: %d\n", __func__,
 197                         mode->vdisplay);
 198
 199         list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
 200                 if (encoder->crtc == crtc)
 201                         encoder_types |= BIT(encoder->encoder_type);
 202         }
 203
 204         dev_dbg(ipu_crtc->dev, "%s: attached to encoder types 0x%lx\n",
 205                 __func__, encoder_types);
 206
 207         /*
 208          * If we have DAC or LDB, then we need the IPU DI clock to be
 209          * the same as the LDB DI clock. For TVDAC, derive the IPU DI
 210          * clock from 27 MHz TVE_DI clock, but allow to divide it.
 211          */
 212         if (encoder_types & (BIT(DRM_MODE_ENCODER_DAC) |
 213                              BIT(DRM_MODE_ENCODER_LVDS)))
 214                 sig_cfg.clkflags = IPU_DI_CLKMODE_SYNC | IPU_DI_CLKMODE_EXT;
 215         else if (encoder_types & BIT(DRM_MODE_ENCODER_TVDAC))
 216                 sig_cfg.clkflags = IPU_DI_CLKMODE_EXT;
 217         else
 218                 sig_cfg.clkflags = 0;
 219
 220         sig_cfg.enable_pol = !(imx_crtc_state->bus_flags & DRM_BUS_FLAG_DE_LOW);
 221         /* Default to driving pixel data on negative clock edges */
 222         sig_cfg.clk_pol = !!(imx_crtc_state->bus_flags &
 223                              DRM_BUS_FLAG_PIXDATA_POSEDGE);
 224         sig_cfg.bus_format = imx_crtc_state->bus_format;
 225         sig_cfg.v_to_h_sync = 0;
 226         sig_cfg.hsync_pin = imx_crtc_state->di_hsync_pin;
 227         sig_cfg.vsync_pin = imx_crtc_state->di_vsync_pin;
 228
 229         drm_display_mode_to_videomode(mode, &sig_cfg.mode);
 230
 231         ipu_dc_init_sync(ipu_crtc->dc, ipu_crtc->di,
 232                          mode->flags & DRM_MODE_FLAG_INTERLACE,
 233                          imx_crtc_state->bus_format, mode->hdisplay);
 234         ipu_di_init_sync_panel(ipu_crtc->di, &sig_cfg);
 235 }
 236
 237 static const struct drm_crtc_helper_funcs ipu_helper_funcs = {
 238         .mode_fixup = ipu_crtc_mode_fixup,
 239         .mode_set_nofb = ipu_crtc_mode_set_nofb,
 240         .atomic_check = ipu_crtc_atomic_check,
 241         .atomic_begin = ipu_crtc_atomic_begin,
 242         .disable = ipu_crtc_disable,
 243         .enable = ipu_crtc_enable,
 244 };
 245
 246 static int ipu_enable_vblank(struct drm_crtc *crtc)
 247 {
 248         struct ipu_crtc *ipu_crtc = to_ipu_crtc(crtc);
 249
 250         enable_irq(ipu_crtc->irq);
 251
 252         return 0;
 253 }
 254
 255 static void ipu_disable_vblank(struct drm_crtc *crtc)
 256 {
 257         struct ipu_crtc *ipu_crtc = to_ipu_crtc(crtc);
 258
 259         disable_irq_nosync(ipu_crtc->irq);
 260 }
 261
 262 static const struct imx_drm_crtc_helper_funcs ipu_crtc_helper_funcs = {
 263         .enable_vblank = ipu_enable_vblank,
 264         .disable_vblank = ipu_disable_vblank,
 265         .crtc_funcs = &ipu_crtc_funcs,
 266         .crtc_helper_funcs = &ipu_helper_funcs,
 267 };
 268
 269 static void ipu_put_resources(struct ipu_crtc *ipu_crtc)
 270 {
 271         if (!IS_ERR_OR_NULL(ipu_crtc->dc))
 272                 ipu_dc_put(ipu_crtc->dc);
 273         if (!IS_ERR_OR_NULL(ipu_crtc->di))
 274                 ipu_di_put(ipu_crtc->di);
 275 }
 276
 277 static int ipu_get_resources(struct ipu_crtc *ipu_crtc,
 278                 struct ipu_client_platformdata *pdata)
 279 {
 280         struct ipu_soc *ipu = dev_get_drvdata(ipu_crtc->dev->parent);
 281         int ret;
 282
 283         ipu_crtc->dc = ipu_dc_get(ipu, pdata->dc);
 284         if (IS_ERR(ipu_crtc->dc)) {
 285                 ret = PTR_ERR(ipu_crtc->dc);
 286                 goto err_out;
 287         }
 288
 289         ipu_crtc->di = ipu_di_get(ipu, pdata->di);
 290         if (IS_ERR(ipu_crtc->di)) {
 291                 ret = PTR_ERR(ipu_crtc->di);
 292                 goto err_out;
 293         }
 294
 295         return 0;
 296 err_out:
 297         ipu_put_resources(ipu_crtc);
 298
 299         return ret;
 300 }
 301
 302 static int ipu_crtc_init(struct ipu_crtc *ipu_crtc,
 303         struct ipu_client_platformdata *pdata, struct drm_device *drm)
 304 {
 305         struct ipu_soc *ipu = dev_get_drvdata(ipu_crtc->dev->parent);
 306         int dp = -EINVAL;
 307         int ret;
 308
 309         ret = ipu_get_resources(ipu_crtc, pdata);
 310         if (ret) {
 311                 dev_err(ipu_crtc->dev, "getting resources failed with %d.\n",
 312                                 ret);
 313                 return ret;
 314         }
 315
 316         if (pdata->dp >= 0)
 317                 dp = IPU_DP_FLOW_SYNC_BG;
 318         ipu_crtc->plane[0] = ipu_plane_init(drm, ipu, pdata->dma[0], dp, 0,
 319                                             DRM_PLANE_TYPE_PRIMARY);
 320         if (IS_ERR(ipu_crtc->plane[0])) {
 321                 ret = PTR_ERR(ipu_crtc->plane[0]);
 322                 goto err_put_resources;
 323         }
 324
 325         ret = imx_drm_add_crtc(drm, &ipu_crtc->base, &ipu_crtc->imx_crtc,
 326                         &ipu_crtc->plane[0]->base, &ipu_crtc_helper_funcs,
 327                         pdata->of_node);
 328         if (ret) {
 329                 dev_err(ipu_crtc->dev, "adding crtc failed with %d.\n", ret);
 330                 goto err_put_resources;
 331         }
 332
 333         ret = ipu_plane_get_resources(ipu_crtc->plane[0]);
 334         if (ret) {
 335                 dev_err(ipu_crtc->dev, "getting plane 0 resources failed with %d.\n",
 336                         ret);
 337                 goto err_remove_crtc;
 338         }
 339
 340         /* If this crtc is using the DP, add an overlay plane */
 341         if (pdata->dp >= 0 && pdata->dma[1] > 0) {
 342                 ipu_crtc->plane[1] = ipu_plane_init(drm, ipu, pdata->dma[1],
 343                                                 IPU_DP_FLOW_SYNC_FG,
 344                                                 drm_crtc_mask(&ipu_crtc->base),
 345                                                 DRM_PLANE_TYPE_OVERLAY);
 346                 if (IS_ERR(ipu_crtc->plane[1])) {
 347                         ipu_crtc->plane[1] = NULL;
 348                 } else {
 349                         ret = ipu_plane_get_resources(ipu_crtc->plane[1]);
 350                         if (ret) {
 351                                 dev_err(ipu_crtc->dev, "getting plane 1 "
 352                                         "resources failed with %d.\n", ret);
 353                                 goto err_put_plane0_res;
 354                         }
 355                 }
 356         }
 357
 358         ipu_crtc->irq = ipu_plane_irq(ipu_crtc->plane[0]);
 359         ret = devm_request_irq(ipu_crtc->dev, ipu_crtc->irq, ipu_irq_handler, 0,
 360                         "imx_drm", ipu_crtc);
 361         if (ret < 0) {
 362                 dev_err(ipu_crtc->dev, "irq request failed with %d.\n", ret);
 363                 goto err_put_plane1_res;
 364         }
 365         /* Only enable IRQ when we actually need it to trigger work. */
 366         disable_irq(ipu_crtc->irq);
 367
 368         return 0;
 369
 370 err_put_plane1_res:
 371         if (ipu_crtc->plane[1])
 372                 ipu_plane_put_resources(ipu_crtc->plane[1]);
 373 err_put_plane0_res:
 374         ipu_plane_put_resources(ipu_crtc->plane[0]);
 375 err_remove_crtc:
 376         imx_drm_remove_crtc(ipu_crtc->imx_crtc);
 377 err_put_resources:
 378         ipu_put_resources(ipu_crtc);
 379
 380         return ret;
 381 }
 382
 383 static int ipu_drm_bind(struct device *dev, struct device *master, void *data)
 384 {
 385         struct ipu_client_platformdata *pdata = dev->platform_data;
 386         struct drm_device *drm = data;
 387         struct ipu_crtc *ipu_crtc;
 388         int ret;
 389
 390         ipu_crtc = devm_kzalloc(dev, sizeof(*ipu_crtc), GFP_KERNEL);
 391         if (!ipu_crtc)
 392                 return -ENOMEM;
 393
 394         ipu_crtc->dev = dev;
 395
 396         ret = ipu_crtc_init(ipu_crtc, pdata, drm);
 397         if (ret)
 398                 return ret;
 399
 400         dev_set_drvdata(dev, ipu_crtc);
 401
 402         return 0;
 403 }
 404
 405 static void ipu_drm_unbind(struct device *dev, struct device *master,
 406         void *data)
 407 {
 408         struct ipu_crtc *ipu_crtc = dev_get_drvdata(dev);
 409
 410         imx_drm_remove_crtc(ipu_crtc->imx_crtc);
 411
 412         ipu_put_resources(ipu_crtc);
 413         if (ipu_crtc->plane[1])
 414                 ipu_plane_put_resources(ipu_crtc->plane[1]);
 415         ipu_plane_put_resources(ipu_crtc->plane[0]);
 416 }
 417
 418 static const struct component_ops ipu_crtc_ops = {
 419         .bind = ipu_drm_bind,
 420         .unbind = ipu_drm_unbind,
 421 };
 422
 423 static int ipu_drm_probe(struct platform_device *pdev)
 424 {
 425         struct device *dev = &pdev->dev;
 426         int ret;
 427
 428         if (!dev->platform_data)
 429                 return -EINVAL;
 430
 431         ret = dma_set_coherent_mask(dev, DMA_BIT_MASK(32));
 432         if (ret)
 433                 return ret;
 434
 435         return component_add(dev, &ipu_crtc_ops);
 436 }
 437
 438 static int ipu_drm_remove(struct platform_device *pdev)
 439 {
 440         component_del(&pdev->dev, &ipu_crtc_ops);
 441         return 0;
 442 }
 443
 444 static struct platform_driver ipu_drm_driver = {
 445         .driver = {
 446                 .name = "imx-ipuv3-crtc",
 447         },
 448         .probe = ipu_drm_probe,
 449         .remove = ipu_drm_remove,
 450 };
 451 module_platform_driver(ipu_drm_driver);
 452
 453 MODULE_AUTHOR("Sascha Hauer <s.hauer@pengutronix.de>");
 454 MODULE_DESCRIPTION(DRIVER_DESC);
 455 MODULE_LICENSE("GPL");
 456 MODULE_ALIAS("platform:imx-ipuv3-crtc");