drivers/media/platform/stm32/stm32-dcmi.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * Driver for STM32 Digital Camera Memory Interface
   4  *
   5  * Copyright (C) STMicroelectronics SA 2017
   6  * Authors: Yannick Fertre <[email protected]>
   7  *          Hugues Fruchet <[email protected]>
   8  *          for STMicroelectronics.
   9  *
  10  * This driver is based on atmel_isi.c
  11  *
  12  */
  13
  14 #include <linux/clk.h>
  15 #include <linux/completion.h>
  16 #include <linux/delay.h>
  17 #include <linux/dmaengine.h>
  18 #include <linux/init.h>
  19 #include <linux/interrupt.h>
  20 #include <linux/kernel.h>
  21 #include <linux/module.h>
  22 #include <linux/of.h>
  23 #include <linux/of_device.h>
  24 #include <linux/of_graph.h>
  25 #include <linux/pinctrl/consumer.h>
  26 #include <linux/platform_device.h>
  27 #include <linux/pm_runtime.h>
  28 #include <linux/reset.h>
  29 #include <linux/videodev2.h>
  30
  31 #include <media/v4l2-ctrls.h>
  32 #include <media/v4l2-dev.h>
  33 #include <media/v4l2-device.h>
  34 #include <media/v4l2-event.h>
  35 #include <media/v4l2-fwnode.h>
  36 #include <media/v4l2-image-sizes.h>
  37 #include <media/v4l2-ioctl.h>
  38 #include <media/v4l2-rect.h>
  39 #include <media/videobuf2-dma-contig.h>
  40
  41 #define DRV_NAME "stm32-dcmi"
  42
  43 /* Registers offset for DCMI */
  44 #define DCMI_CR         0x00 /* Control Register */
  45 #define DCMI_SR         0x04 /* Status Register */
  46 #define DCMI_RIS        0x08 /* Raw Interrupt Status register */
  47 #define DCMI_IER        0x0C /* Interrupt Enable Register */
  48 #define DCMI_MIS        0x10 /* Masked Interrupt Status register */
  49 #define DCMI_ICR        0x14 /* Interrupt Clear Register */
  50 #define DCMI_ESCR       0x18 /* Embedded Synchronization Code Register */
  51 #define DCMI_ESUR       0x1C /* Embedded Synchronization Unmask Register */
  52 #define DCMI_CWSTRT     0x20 /* Crop Window STaRT */
  53 #define DCMI_CWSIZE     0x24 /* Crop Window SIZE */
  54 #define DCMI_DR         0x28 /* Data Register */
  55 #define DCMI_IDR        0x2C /* IDentifier Register */
  56
  57 /* Bits definition for control register (DCMI_CR) */
  58 #define CR_CAPTURE      BIT(0)
  59 #define CR_CM           BIT(1)
  60 #define CR_CROP         BIT(2)
  61 #define CR_JPEG         BIT(3)
  62 #define CR_ESS          BIT(4)
  63 #define CR_PCKPOL       BIT(5)
  64 #define CR_HSPOL        BIT(6)
  65 #define CR_VSPOL        BIT(7)
  66 #define CR_FCRC_0       BIT(8)
  67 #define CR_FCRC_1       BIT(9)
  68 #define CR_EDM_0        BIT(10)
  69 #define CR_EDM_1        BIT(11)
  70 #define CR_ENABLE       BIT(14)
  71
  72 /* Bits definition for status register (DCMI_SR) */
  73 #define SR_HSYNC        BIT(0)
  74 #define SR_VSYNC        BIT(1)
  75 #define SR_FNE          BIT(2)
  76
  77 /*
  78  * Bits definition for interrupt registers
  79  * (DCMI_RIS, DCMI_IER, DCMI_MIS, DCMI_ICR)
  80  */
  81 #define IT_FRAME        BIT(0)
  82 #define IT_OVR          BIT(1)
  83 #define IT_ERR          BIT(2)
  84 #define IT_VSYNC        BIT(3)
  85 #define IT_LINE         BIT(4)
  86
  87 enum state {
  88         STOPPED = 0,
  89         WAIT_FOR_BUFFER,
  90         RUNNING,
  91 };
  92
  93 #define MIN_WIDTH       16U
  94 #define MAX_WIDTH       2592U
  95 #define MIN_HEIGHT      16U
  96 #define MAX_HEIGHT      2592U
  97
  98 #define TIMEOUT_MS      1000
  99
 100 #define OVERRUN_ERROR_THRESHOLD 3
 101
 102 struct dcmi_format {
 103         u32     fourcc;
 104         u32     mbus_code;
 105         u8      bpp;
 106 };
 107
 108 struct dcmi_framesize {
 109         u32     width;
 110         u32     height;
 111 };
 112
 113 struct dcmi_buf {
 114         struct vb2_v4l2_buffer  vb;
 115         bool                    prepared;
 116         dma_addr_t              paddr;
 117         size_t                  size;
 118         struct list_head        list;
 119 };
 120
 121 struct stm32_dcmi {
 122         /* Protects the access of variables shared within the interrupt */
 123         spinlock_t                      irqlock;
 124         struct device                   *dev;
 125         void __iomem                    *regs;
 126         struct resource                 *res;
 127         struct reset_control            *rstc;
 128         int                             sequence;
 129         struct list_head                buffers;
 130         struct dcmi_buf                 *active;
 131
 132         struct v4l2_device              v4l2_dev;
 133         struct video_device             *vdev;
 134         struct v4l2_async_notifier      notifier;
 135         struct v4l2_subdev              *source;
 136         struct v4l2_format              fmt;
 137         struct v4l2_rect                crop;
 138         bool                            do_crop;
 139
 140         const struct dcmi_format        **sd_formats;
 141         unsigned int                    num_of_sd_formats;
 142         const struct dcmi_format        *sd_format;
 143         struct dcmi_framesize           *sd_framesizes;
 144         unsigned int                    num_of_sd_framesizes;
 145         struct dcmi_framesize           sd_framesize;
 146         struct v4l2_rect                sd_bounds;
 147
 148         /* Protect this data structure */
 149         struct mutex                    lock;
 150         struct vb2_queue                queue;
 151
 152         struct v4l2_fwnode_bus_parallel bus;
 153         enum v4l2_mbus_type             bus_type;
 154         struct completion               complete;
 155         struct clk                      *mclk;
 156         enum state                      state;
 157         struct dma_chan                 *dma_chan;
 158         dma_cookie_t                    dma_cookie;
 159         u32                             misr;
 160         int                             errors_count;
 161         int                             overrun_count;
 162         int                             buffers_count;
 163
 164         /* Ensure DMA operations atomicity */
 165         struct mutex                    dma_lock;
 166
 167         struct media_device             mdev;
 168         struct media_pad                vid_cap_pad;
 169         struct media_pipeline           pipeline;
 170 };
 171
 172 static inline struct stm32_dcmi *notifier_to_dcmi(struct v4l2_async_notifier *n)
 173 {
 174         return container_of(n, struct stm32_dcmi, notifier);
 175 }
 176
 177 static inline u32 reg_read(void __iomem *base, u32 reg)
 178 {
 179         return readl_relaxed(base + reg);
 180 }
 181
 182 static inline void reg_write(void __iomem *base, u32 reg, u32 val)
 183 {
 184         writel_relaxed(val, base + reg);
 185 }
 186
 187 static inline void reg_set(void __iomem *base, u32 reg, u32 mask)
 188 {
 189         reg_write(base, reg, reg_read(base, reg) | mask);
 190 }
 191
 192 static inline void reg_clear(void __iomem *base, u32 reg, u32 mask)
 193 {
 194         reg_write(base, reg, reg_read(base, reg) & ~mask);
 195 }
 196
 197 static int dcmi_start_capture(struct stm32_dcmi *dcmi, struct dcmi_buf *buf);
 198
 199 static void dcmi_buffer_done(struct stm32_dcmi *dcmi,
 200                              struct dcmi_buf *buf,
 201                              size_t bytesused,
 202                              int err)
 203 {
 204         struct vb2_v4l2_buffer *vbuf;
 205
 206         if (!buf)
 207                 return;
 208
 209         list_del_init(&buf->list);
 210
 211         vbuf = &buf->vb;
 212
 213         vbuf->sequence = dcmi->sequence++;
 214         vbuf->field = V4L2_FIELD_NONE;
 215         vbuf->vb2_buf.timestamp = ktime_get_ns();
 216         vb2_set_plane_payload(&vbuf->vb2_buf, 0, bytesused);
 217         vb2_buffer_done(&vbuf->vb2_buf,
 218                         err ? VB2_BUF_STATE_ERROR : VB2_BUF_STATE_DONE);
 219         dev_dbg(dcmi->dev, "buffer[%d] done seq=%d, bytesused=%zu\n",
 220                 vbuf->vb2_buf.index, vbuf->sequence, bytesused);
 221
 222         dcmi->buffers_count++;
 223         dcmi->active = NULL;
 224 }
 225
 226 static int dcmi_restart_capture(struct stm32_dcmi *dcmi)
 227 {
 228         struct dcmi_buf *buf;
 229
 230         spin_lock_irq(&dcmi->irqlock);
 231
 232         if (dcmi->state != RUNNING) {
 233                 spin_unlock_irq(&dcmi->irqlock);
 234                 return -EINVAL;
 235         }
 236
 237         /* Restart a new DMA transfer with next buffer */
 238         if (list_empty(&dcmi->buffers)) {
 239                 dev_dbg(dcmi->dev, "Capture restart is deferred to next buffer queueing\n");
 240                 dcmi->state = WAIT_FOR_BUFFER;
 241                 spin_unlock_irq(&dcmi->irqlock);
 242                 return 0;
 243         }
 244         buf = list_entry(dcmi->buffers.next, struct dcmi_buf, list);
 245         dcmi->active = buf;
 246
 247         spin_unlock_irq(&dcmi->irqlock);
 248
 249         return dcmi_start_capture(dcmi, buf);
 250 }
 251
 252 static void dcmi_dma_callback(void *param)
 253 {
 254         struct stm32_dcmi *dcmi = (struct stm32_dcmi *)param;
 255         struct dma_tx_state state;
 256         enum dma_status status;
 257         struct dcmi_buf *buf = dcmi->active;
 258
 259         spin_lock_irq(&dcmi->irqlock);
 260
 261         /* Check DMA status */
 262         status = dmaengine_tx_status(dcmi->dma_chan, dcmi->dma_cookie, &state);
 263
 264         switch (status) {
 265         case DMA_IN_PROGRESS:
 266                 dev_dbg(dcmi->dev, "%s: Received DMA_IN_PROGRESS\n", __func__);
 267                 break;
 268         case DMA_PAUSED:
 269                 dev_err(dcmi->dev, "%s: Received DMA_PAUSED\n", __func__);
 270                 break;
 271         case DMA_ERROR:
 272                 dev_err(dcmi->dev, "%s: Received DMA_ERROR\n", __func__);
 273
 274                 /* Return buffer to V4L2 in error state */
 275                 dcmi_buffer_done(dcmi, buf, 0, -EIO);
 276                 break;
 277         case DMA_COMPLETE:
 278                 dev_dbg(dcmi->dev, "%s: Received DMA_COMPLETE\n", __func__);
 279
 280                 /* Return buffer to V4L2 */
 281                 dcmi_buffer_done(dcmi, buf, buf->size, 0);
 282
 283                 spin_unlock_irq(&dcmi->irqlock);
 284
 285                 /* Restart capture */
 286                 if (dcmi_restart_capture(dcmi))
 287                         dev_err(dcmi->dev, "%s: Cannot restart capture on DMA complete\n",
 288                                 __func__);
 289                 return;
 290         default:
 291                 dev_err(dcmi->dev, "%s: Received unknown status\n", __func__);
 292                 break;
 293         }
 294
 295         spin_unlock_irq(&dcmi->irqlock);
 296 }
 297
 298 static int dcmi_start_dma(struct stm32_dcmi *dcmi,
 299                           struct dcmi_buf *buf)
 300 {
 301         struct dma_async_tx_descriptor *desc = NULL;
 302         struct dma_slave_config config;
 303         int ret;
 304
 305         memset(&config, 0, sizeof(config));
 306
 307         config.src_addr = (dma_addr_t)dcmi->res->start + DCMI_DR;
 308         config.src_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
 309         config.dst_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
 310         config.dst_maxburst = 4;
 311
 312         /* Configure DMA channel */
 313         ret = dmaengine_slave_config(dcmi->dma_chan, &config);
 314         if (ret < 0) {
 315                 dev_err(dcmi->dev, "%s: DMA channel config failed (%d)\n",
 316                         __func__, ret);
 317                 return ret;
 318         }
 319
 320         /*
 321          * Avoid call of dmaengine_terminate_sync() between
 322          * dmaengine_prep_slave_single() and dmaengine_submit()
 323          * by locking the whole DMA submission sequence
 324          */
 325         mutex_lock(&dcmi->dma_lock);
 326
 327         /* Prepare a DMA transaction */
 328         desc = dmaengine_prep_slave_single(dcmi->dma_chan, buf->paddr,
 329                                            buf->size,
 330                                            DMA_DEV_TO_MEM,
 331                                            DMA_PREP_INTERRUPT);
 332         if (!desc) {
 333                 dev_err(dcmi->dev, "%s: DMA dmaengine_prep_slave_single failed for buffer phy=%pad size=%zu\n",
 334                         __func__, &buf->paddr, buf->size);
 335                 mutex_unlock(&dcmi->dma_lock);
 336                 return -EINVAL;
 337         }
 338
 339         /* Set completion callback routine for notification */
 340         desc->callback = dcmi_dma_callback;
 341         desc->callback_param = dcmi;
 342
 343         /* Push current DMA transaction in the pending queue */
 344         dcmi->dma_cookie = dmaengine_submit(desc);
 345         if (dma_submit_error(dcmi->dma_cookie)) {
 346                 dev_err(dcmi->dev, "%s: DMA submission failed\n", __func__);
 347                 mutex_unlock(&dcmi->dma_lock);
 348                 return -ENXIO;
 349         }
 350
 351         mutex_unlock(&dcmi->dma_lock);
 352
 353         dma_async_issue_pending(dcmi->dma_chan);
 354
 355         return 0;
 356 }
 357
 358 static int dcmi_start_capture(struct stm32_dcmi *dcmi, struct dcmi_buf *buf)
 359 {
 360         int ret;
 361
 362         if (!buf)
 363                 return -EINVAL;
 364
 365         ret = dcmi_start_dma(dcmi, buf);
 366         if (ret) {
 367                 dcmi->errors_count++;
 368                 return ret;
 369         }
 370
 371         /* Enable capture */
 372         reg_set(dcmi->regs, DCMI_CR, CR_CAPTURE);
 373
 374         return 0;
 375 }
 376
 377 static void dcmi_set_crop(struct stm32_dcmi *dcmi)
 378 {
 379         u32 size, start;
 380
 381         /* Crop resolution */
 382         size = ((dcmi->crop.height - 1) << 16) |
 383                 ((dcmi->crop.width << 1) - 1);
 384         reg_write(dcmi->regs, DCMI_CWSIZE, size);
 385
 386         /* Crop start point */
 387         start = ((dcmi->crop.top) << 16) |
 388                  ((dcmi->crop.left << 1));
 389         reg_write(dcmi->regs, DCMI_CWSTRT, start);
 390
 391         dev_dbg(dcmi->dev, "Cropping to %ux%u@%u:%u\n",
 392                 dcmi->crop.width, dcmi->crop.height,
 393                 dcmi->crop.left, dcmi->crop.top);
 394
 395         /* Enable crop */
 396         reg_set(dcmi->regs, DCMI_CR, CR_CROP);
 397 }
 398
 399 static void dcmi_process_jpeg(struct stm32_dcmi *dcmi)
 400 {
 401         struct dma_tx_state state;
 402         enum dma_status status;
 403         struct dcmi_buf *buf = dcmi->active;
 404
 405         if (!buf)
 406                 return;
 407
 408         /*
 409          * Because of variable JPEG buffer size sent by sensor,
 410          * DMA transfer never completes due to transfer size never reached.
 411          * In order to ensure that all the JPEG data are transferred
 412          * in active buffer memory, DMA is drained.
 413          * Then DMA tx status gives the amount of data transferred
 414          * to memory, which is then returned to V4L2 through the active
 415          * buffer payload.
 416          */
 417
 418         /* Drain DMA */
 419         dmaengine_synchronize(dcmi->dma_chan);
 420
 421         /* Get DMA residue to get JPEG size */
 422         status = dmaengine_tx_status(dcmi->dma_chan, dcmi->dma_cookie, &state);
 423         if (status != DMA_ERROR && state.residue < buf->size) {
 424                 /* Return JPEG buffer to V4L2 with received JPEG buffer size */
 425                 dcmi_buffer_done(dcmi, buf, buf->size - state.residue, 0);
 426         } else {
 427                 dcmi->errors_count++;
 428                 dev_err(dcmi->dev, "%s: Cannot get JPEG size from DMA\n",
 429                         __func__);
 430                 /* Return JPEG buffer to V4L2 in ERROR state */
 431                 dcmi_buffer_done(dcmi, buf, 0, -EIO);
 432         }
 433
 434         /* Abort DMA operation */
 435         dmaengine_terminate_sync(dcmi->dma_chan);
 436
 437         /* Restart capture */
 438         if (dcmi_restart_capture(dcmi))
 439                 dev_err(dcmi->dev, "%s: Cannot restart capture on JPEG received\n",
 440                         __func__);
 441 }
 442
 443 static irqreturn_t dcmi_irq_thread(int irq, void *arg)
 444 {
 445         struct stm32_dcmi *dcmi = arg;
 446
 447         spin_lock_irq(&dcmi->irqlock);
 448
 449         if (dcmi->misr & IT_OVR) {
 450                 dcmi->overrun_count++;
 451                 if (dcmi->overrun_count > OVERRUN_ERROR_THRESHOLD)
 452                         dcmi->errors_count++;
 453         }
 454         if (dcmi->misr & IT_ERR)
 455                 dcmi->errors_count++;
 456
 457         if (dcmi->sd_format->fourcc == V4L2_PIX_FMT_JPEG &&
 458             dcmi->misr & IT_FRAME) {
 459                 /* JPEG received */
 460                 spin_unlock_irq(&dcmi->irqlock);
 461                 dcmi_process_jpeg(dcmi);
 462                 return IRQ_HANDLED;
 463         }
 464
 465         spin_unlock_irq(&dcmi->irqlock);
 466         return IRQ_HANDLED;
 467 }
 468
 469 static irqreturn_t dcmi_irq_callback(int irq, void *arg)
 470 {
 471         struct stm32_dcmi *dcmi = arg;
 472         unsigned long flags;
 473
 474         spin_lock_irqsave(&dcmi->irqlock, flags);
 475
 476         dcmi->misr = reg_read(dcmi->regs, DCMI_MIS);
 477
 478         /* Clear interrupt */
 479         reg_set(dcmi->regs, DCMI_ICR, IT_FRAME | IT_OVR | IT_ERR);
 480
 481         spin_unlock_irqrestore(&dcmi->irqlock, flags);
 482
 483         return IRQ_WAKE_THREAD;
 484 }
 485
 486 static int dcmi_queue_setup(struct vb2_queue *vq,
 487                             unsigned int *nbuffers,
 488                             unsigned int *nplanes,
 489                             unsigned int sizes[],
 490                             struct device *alloc_devs[])
 491 {
 492         struct stm32_dcmi *dcmi = vb2_get_drv_priv(vq);
 493         unsigned int size;
 494
 495         size = dcmi->fmt.fmt.pix.sizeimage;
 496
 497         /* Make sure the image size is large enough */
 498         if (*nplanes)
 499                 return sizes[0] < size ? -EINVAL : 0;
 500
 501         *nplanes = 1;
 502         sizes[0] = size;
 503
 504         dev_dbg(dcmi->dev, "Setup queue, count=%d, size=%d\n",
 505                 *nbuffers, size);
 506
 507         return 0;
 508 }
 509
 510 static int dcmi_buf_init(struct vb2_buffer *vb)
 511 {
 512         struct vb2_v4l2_buffer *vbuf = to_vb2_v4l2_buffer(vb);
 513         struct dcmi_buf *buf = container_of(vbuf, struct dcmi_buf, vb);
 514
 515         INIT_LIST_HEAD(&buf->list);
 516
 517         return 0;
 518 }
 519
 520 static int dcmi_buf_prepare(struct vb2_buffer *vb)
 521 {
 522         struct stm32_dcmi *dcmi =  vb2_get_drv_priv(vb->vb2_queue);
 523         struct vb2_v4l2_buffer *vbuf = to_vb2_v4l2_buffer(vb);
 524         struct dcmi_buf *buf = container_of(vbuf, struct dcmi_buf, vb);
 525         unsigned long size;
 526
 527         size = dcmi->fmt.fmt.pix.sizeimage;
 528
 529         if (vb2_plane_size(vb, 0) < size) {
 530                 dev_err(dcmi->dev, "%s data will not fit into plane (%lu < %lu)\n",
 531                         __func__, vb2_plane_size(vb, 0), size);
 532                 return -EINVAL;
 533         }
 534
 535         vb2_set_plane_payload(vb, 0, size);
 536
 537         if (!buf->prepared) {
 538                 /* Get memory addresses */
 539                 buf->paddr =
 540                         vb2_dma_contig_plane_dma_addr(&buf->vb.vb2_buf, 0);
 541                 buf->size = vb2_plane_size(&buf->vb.vb2_buf, 0);
 542                 buf->prepared = true;
 543
 544                 vb2_set_plane_payload(&buf->vb.vb2_buf, 0, buf->size);
 545
 546                 dev_dbg(dcmi->dev, "buffer[%d] phy=%pad size=%zu\n",
 547                         vb->index, &buf->paddr, buf->size);
 548         }
 549
 550         return 0;
 551 }
 552
 553 static void dcmi_buf_queue(struct vb2_buffer *vb)
 554 {
 555         struct stm32_dcmi *dcmi =  vb2_get_drv_priv(vb->vb2_queue);
 556         struct vb2_v4l2_buffer *vbuf = to_vb2_v4l2_buffer(vb);
 557         struct dcmi_buf *buf = container_of(vbuf, struct dcmi_buf, vb);
 558
 559         spin_lock_irq(&dcmi->irqlock);
 560
 561         /* Enqueue to video buffers list */
 562         list_add_tail(&buf->list, &dcmi->buffers);
 563
 564         if (dcmi->state == WAIT_FOR_BUFFER) {
 565                 dcmi->state = RUNNING;
 566                 dcmi->active = buf;
 567
 568                 dev_dbg(dcmi->dev, "Starting capture on buffer[%d] queued\n",
 569                         buf->vb.vb2_buf.index);
 570
 571                 spin_unlock_irq(&dcmi->irqlock);
 572                 if (dcmi_start_capture(dcmi, buf))
 573                         dev_err(dcmi->dev, "%s: Cannot restart capture on overflow or error\n",
 574                                 __func__);
 575                 return;
 576         }
 577
 578         spin_unlock_irq(&dcmi->irqlock);
 579 }
 580
 581 static struct media_entity *dcmi_find_source(struct stm32_dcmi *dcmi)
 582 {
 583         struct media_entity *entity = &dcmi->vdev->entity;
 584         struct media_pad *pad;
 585
 586         /* Walk searching for entity having no sink */
 587         while (1) {
 588                 pad = &entity->pads[0];
 589                 if (!(pad->flags & MEDIA_PAD_FL_SINK))
 590                         break;
 591
 592                 pad = media_entity_remote_pad(pad);
 593                 if (!pad || !is_media_entity_v4l2_subdev(pad->entity))
 594                         break;
 595
 596                 entity = pad->entity;
 597         }
 598
 599         return entity;
 600 }
 601
 602 static int dcmi_pipeline_s_fmt(struct stm32_dcmi *dcmi,
 603                                struct v4l2_subdev_pad_config *pad_cfg,
 604                                struct v4l2_subdev_format *format)
 605 {
 606         struct media_entity *entity = &dcmi->source->entity;
 607         struct v4l2_subdev *subdev;
 608         struct media_pad *sink_pad = NULL;
 609         struct media_pad *src_pad = NULL;
 610         struct media_pad *pad = NULL;
 611         struct v4l2_subdev_format fmt = *format;
 612         bool found = false;
 613         int ret;
 614
 615         /*
 616          * Starting from sensor subdevice, walk within
 617          * pipeline and set format on each subdevice
 618          */
 619         while (1) {
 620                 unsigned int i;
 621
 622                 /* Search if current entity has a source pad */
 623                 for (i = 0; i < entity->num_pads; i++) {
 624                         pad = &entity->pads[i];
 625                         if (pad->flags & MEDIA_PAD_FL_SOURCE) {
 626                                 src_pad = pad;
 627                                 found = true;
 628                                 break;
 629                         }
 630                 }
 631                 if (!found)
 632                         break;
 633
 634                 subdev = media_entity_to_v4l2_subdev(entity);
 635
 636                 /* Propagate format on sink pad if any, otherwise source pad */
 637                 if (sink_pad)
 638                         pad = sink_pad;
 639
 640                 dev_dbg(dcmi->dev, "\"%s\":%d pad format set to 0x%x %ux%u\n",
 641                         subdev->name, pad->index, format->format.code,
 642                         format->format.width, format->format.height);
 643
 644                 fmt.pad = pad->index;
 645                 ret = v4l2_subdev_call(subdev, pad, set_fmt, pad_cfg, &fmt);
 646                 if (ret < 0) {
 647                         dev_err(dcmi->dev, "%s: Failed to set format 0x%x %ux%u on \"%s\":%d pad (%d)\n",
 648                                 __func__, format->format.code,
 649                                 format->format.width, format->format.height,
 650                                 subdev->name, pad->index, ret);
 651                         return ret;
 652                 }
 653
 654                 if (fmt.format.code != format->format.code ||
 655                     fmt.format.width != format->format.width ||
 656                     fmt.format.height != format->format.height) {
 657                         dev_dbg(dcmi->dev, "\"%s\":%d pad format has been changed to 0x%x %ux%u\n",
 658                                 subdev->name, pad->index, fmt.format.code,
 659                                 fmt.format.width, fmt.format.height);
 660                 }
 661
 662                 /* Walk to next entity */
 663                 sink_pad = media_entity_remote_pad(src_pad);
 664                 if (!sink_pad || !is_media_entity_v4l2_subdev(sink_pad->entity))
 665                         break;
 666
 667                 entity = sink_pad->entity;
 668         }
 669         *format = fmt;
 670
 671         return 0;
 672 }
 673
 674 static int dcmi_pipeline_s_stream(struct stm32_dcmi *dcmi, int state)
 675 {
 676         struct media_entity *entity = &dcmi->vdev->entity;
 677         struct v4l2_subdev *subdev;
 678         struct media_pad *pad;
 679         int ret;
 680
 681         /* Start/stop all entities within pipeline */
 682         while (1) {
 683                 pad = &entity->pads[0];
 684                 if (!(pad->flags & MEDIA_PAD_FL_SINK))
 685                         break;
 686
 687                 pad = media_entity_remote_pad(pad);
 688                 if (!pad || !is_media_entity_v4l2_subdev(pad->entity))
 689                         break;
 690
 691                 entity = pad->entity;
 692                 subdev = media_entity_to_v4l2_subdev(entity);
 693
 694                 ret = v4l2_subdev_call(subdev, video, s_stream, state);
 695                 if (ret < 0 && ret != -ENOIOCTLCMD) {
 696                         dev_err(dcmi->dev, "%s: \"%s\" failed to %s streaming (%d)\n",
 697                                 __func__, subdev->name,
 698                                 state ? "start" : "stop", ret);
 699                         return ret;
 700                 }
 701
 702                 dev_dbg(dcmi->dev, "\"%s\" is %s\n",
 703                         subdev->name, state ? "started" : "stopped");
 704         }
 705
 706         return 0;
 707 }
 708
 709 static int dcmi_pipeline_start(struct stm32_dcmi *dcmi)
 710 {
 711         return dcmi_pipeline_s_stream(dcmi, 1);
 712 }
 713
 714 static void dcmi_pipeline_stop(struct stm32_dcmi *dcmi)
 715 {
 716         dcmi_pipeline_s_stream(dcmi, 0);
 717 }
 718
 719 static int dcmi_start_streaming(struct vb2_queue *vq, unsigned int count)
 720 {
 721         struct stm32_dcmi *dcmi = vb2_get_drv_priv(vq);
 722         struct dcmi_buf *buf, *node;
 723         u32 val = 0;
 724         int ret;
 725
 726         ret = pm_runtime_get_sync(dcmi->dev);
 727         if (ret < 0) {
 728                 dev_err(dcmi->dev, "%s: Failed to start streaming, cannot get sync (%d)\n",
 729                         __func__, ret);
 730                 goto err_pm_put;
 731         }
 732
 733         ret = media_pipeline_start(&dcmi->vdev->entity, &dcmi->pipeline);
 734         if (ret < 0) {
 735                 dev_err(dcmi->dev, "%s: Failed to start streaming, media pipeline start error (%d)\n",
 736                         __func__, ret);
 737                 goto err_pm_put;
 738         }
 739
 740         ret = dcmi_pipeline_start(dcmi);
 741         if (ret)
 742                 goto err_media_pipeline_stop;
 743
 744         spin_lock_irq(&dcmi->irqlock);
 745
 746         /* Set bus width */
 747         switch (dcmi->bus.bus_width) {
 748         case 14:
 749                 val |= CR_EDM_0 | CR_EDM_1;
 750                 break;
 751         case 12:
 752                 val |= CR_EDM_1;
 753                 break;
 754         case 10:
 755                 val |= CR_EDM_0;
 756                 break;
 757         default:
 758                 /* Set bus width to 8 bits by default */
 759                 break;
 760         }
 761
 762         /* Set vertical synchronization polarity */
 763         if (dcmi->bus.flags & V4L2_MBUS_VSYNC_ACTIVE_HIGH)
 764                 val |= CR_VSPOL;
 765
 766         /* Set horizontal synchronization polarity */
 767         if (dcmi->bus.flags & V4L2_MBUS_HSYNC_ACTIVE_HIGH)
 768                 val |= CR_HSPOL;
 769
 770         /* Set pixel clock polarity */
 771         if (dcmi->bus.flags & V4L2_MBUS_PCLK_SAMPLE_RISING)
 772                 val |= CR_PCKPOL;
 773
 774         /*
 775          * BT656 embedded synchronisation bus mode.
 776          *
 777          * Default SAV/EAV mode is supported here with default codes
 778          * SAV=0xff000080 & EAV=0xff00009d.
 779          * With DCMI this means LSC=SAV=0x80 & LEC=EAV=0x9d.
 780          */
 781         if (dcmi->bus_type == V4L2_MBUS_BT656) {
 782                 val |= CR_ESS;
 783
 784                 /* Unmask all codes */
 785                 reg_write(dcmi->regs, DCMI_ESUR, 0xffffffff);/* FEC:LEC:LSC:FSC */
 786
 787                 /* Trig on LSC=0x80 & LEC=0x9d codes, ignore FSC and FEC */
 788                 reg_write(dcmi->regs, DCMI_ESCR, 0xff9d80ff);/* FEC:LEC:LSC:FSC */
 789         }
 790
 791         reg_write(dcmi->regs, DCMI_CR, val);
 792
 793         /* Set crop */
 794         if (dcmi->do_crop)
 795                 dcmi_set_crop(dcmi);
 796
 797         /* Enable jpeg capture */
 798         if (dcmi->sd_format->fourcc == V4L2_PIX_FMT_JPEG)
 799                 reg_set(dcmi->regs, DCMI_CR, CR_CM);/* Snapshot mode */
 800
 801         /* Enable dcmi */
 802         reg_set(dcmi->regs, DCMI_CR, CR_ENABLE);
 803
 804         dcmi->sequence = 0;
 805         dcmi->errors_count = 0;
 806         dcmi->overrun_count = 0;
 807         dcmi->buffers_count = 0;
 808
 809         /*
 810          * Start transfer if at least one buffer has been queued,
 811          * otherwise transfer is deferred at buffer queueing
 812          */
 813         if (list_empty(&dcmi->buffers)) {
 814                 dev_dbg(dcmi->dev, "Start streaming is deferred to next buffer queueing\n");
 815                 dcmi->state = WAIT_FOR_BUFFER;
 816                 spin_unlock_irq(&dcmi->irqlock);
 817                 return 0;
 818         }
 819
 820         buf = list_entry(dcmi->buffers.next, struct dcmi_buf, list);
 821         dcmi->active = buf;
 822
 823         dcmi->state = RUNNING;
 824
 825         dev_dbg(dcmi->dev, "Start streaming, starting capture\n");
 826
 827         spin_unlock_irq(&dcmi->irqlock);
 828         ret = dcmi_start_capture(dcmi, buf);
 829         if (ret) {
 830                 dev_err(dcmi->dev, "%s: Start streaming failed, cannot start capture\n",
 831                         __func__);
 832                 goto err_pipeline_stop;
 833         }
 834
 835         /* Enable interruptions */
 836         if (dcmi->sd_format->fourcc == V4L2_PIX_FMT_JPEG)
 837                 reg_set(dcmi->regs, DCMI_IER, IT_FRAME | IT_OVR | IT_ERR);
 838         else
 839                 reg_set(dcmi->regs, DCMI_IER, IT_OVR | IT_ERR);
 840
 841         return 0;
 842
 843 err_pipeline_stop:
 844         dcmi_pipeline_stop(dcmi);
 845
 846 err_media_pipeline_stop:
 847         media_pipeline_stop(&dcmi->vdev->entity);
 848
 849 err_pm_put:
 850         pm_runtime_put(dcmi->dev);
 851         spin_lock_irq(&dcmi->irqlock);
 852         /*
 853          * Return all buffers to vb2 in QUEUED state.
 854          * This will give ownership back to userspace
 855          */
 856         list_for_each_entry_safe(buf, node, &dcmi->buffers, list) {
 857                 list_del_init(&buf->list);
 858                 vb2_buffer_done(&buf->vb.vb2_buf, VB2_BUF_STATE_QUEUED);
 859         }
 860         dcmi->active = NULL;
 861         spin_unlock_irq(&dcmi->irqlock);
 862
 863         return ret;
 864 }
 865
 866 static void dcmi_stop_streaming(struct vb2_queue *vq)
 867 {
 868         struct stm32_dcmi *dcmi = vb2_get_drv_priv(vq);
 869         struct dcmi_buf *buf, *node;
 870
 871         dcmi_pipeline_stop(dcmi);
 872
 873         media_pipeline_stop(&dcmi->vdev->entity);
 874
 875         spin_lock_irq(&dcmi->irqlock);
 876
 877         /* Disable interruptions */
 878         reg_clear(dcmi->regs, DCMI_IER, IT_FRAME | IT_OVR | IT_ERR);
 879
 880         /* Disable DCMI */
 881         reg_clear(dcmi->regs, DCMI_CR, CR_ENABLE);
 882
 883         /* Return all queued buffers to vb2 in ERROR state */
 884         list_for_each_entry_safe(buf, node, &dcmi->buffers, list) {
 885                 list_del_init(&buf->list);
 886                 vb2_buffer_done(&buf->vb.vb2_buf, VB2_BUF_STATE_ERROR);
 887         }
 888
 889         dcmi->active = NULL;
 890         dcmi->state = STOPPED;
 891
 892         spin_unlock_irq(&dcmi->irqlock);
 893
 894         /* Stop all pending DMA operations */
 895         mutex_lock(&dcmi->dma_lock);
 896         dmaengine_terminate_sync(dcmi->dma_chan);
 897         mutex_unlock(&dcmi->dma_lock);
 898
 899         pm_runtime_put(dcmi->dev);
 900
 901         if (dcmi->errors_count)
 902                 dev_warn(dcmi->dev, "Some errors found while streaming: errors=%d (overrun=%d), buffers=%d\n",
 903                          dcmi->errors_count, dcmi->overrun_count,
 904                          dcmi->buffers_count);
 905         dev_dbg(dcmi->dev, "Stop streaming, errors=%d (overrun=%d), buffers=%d\n",
 906                 dcmi->errors_count, dcmi->overrun_count,
 907                 dcmi->buffers_count);
 908 }
 909
 910 static const struct vb2_ops dcmi_video_qops = {
 911         .queue_setup            = dcmi_queue_setup,
 912         .buf_init               = dcmi_buf_init,
 913         .buf_prepare            = dcmi_buf_prepare,
 914         .buf_queue              = dcmi_buf_queue,
 915         .start_streaming        = dcmi_start_streaming,
 916         .stop_streaming         = dcmi_stop_streaming,
 917         .wait_prepare           = vb2_ops_wait_prepare,
 918         .wait_finish            = vb2_ops_wait_finish,
 919 };
 920
 921 static int dcmi_g_fmt_vid_cap(struct file *file, void *priv,
 922                               struct v4l2_format *fmt)
 923 {
 924         struct stm32_dcmi *dcmi = video_drvdata(file);
 925
 926         *fmt = dcmi->fmt;
 927
 928         return 0;
 929 }
 930
 931 static const struct dcmi_format *find_format_by_fourcc(struct stm32_dcmi *dcmi,
 932                                                        unsigned int fourcc)
 933 {
 934         unsigned int num_formats = dcmi->num_of_sd_formats;
 935         const struct dcmi_format *fmt;
 936         unsigned int i;
 937
 938         for (i = 0; i < num_formats; i++) {
 939                 fmt = dcmi->sd_formats[i];
 940                 if (fmt->fourcc == fourcc)
 941                         return fmt;
 942         }
 943
 944         return NULL;
 945 }
 946
 947 static void __find_outer_frame_size(struct stm32_dcmi *dcmi,
 948                                     struct v4l2_pix_format *pix,
 949                                     struct dcmi_framesize *framesize)
 950 {
 951         struct dcmi_framesize *match = NULL;
 952         unsigned int i;
 953         unsigned int min_err = UINT_MAX;
 954
 955         for (i = 0; i < dcmi->num_of_sd_framesizes; i++) {
 956                 struct dcmi_framesize *fsize = &dcmi->sd_framesizes[i];
 957                 int w_err = (fsize->width - pix->width);
 958                 int h_err = (fsize->height - pix->height);
 959                 int err = w_err + h_err;
 960
 961                 if (w_err >= 0 && h_err >= 0 && err < min_err) {
 962                         min_err = err;
 963                         match = fsize;
 964                 }
 965         }
 966         if (!match)
 967                 match = &dcmi->sd_framesizes[0];
 968
 969         *framesize = *match;
 970 }
 971
 972 static int dcmi_try_fmt(struct stm32_dcmi *dcmi, struct v4l2_format *f,
 973                         const struct dcmi_format **sd_format,
 974                         struct dcmi_framesize *sd_framesize)
 975 {
 976         const struct dcmi_format *sd_fmt;
 977         struct dcmi_framesize sd_fsize;
 978         struct v4l2_pix_format *pix = &f->fmt.pix;
 979         struct v4l2_subdev_pad_config pad_cfg;
 980         struct v4l2_subdev_format format = {
 981                 .which = V4L2_SUBDEV_FORMAT_TRY,
 982         };
 983         bool do_crop;
 984         int ret;
 985
 986         sd_fmt = find_format_by_fourcc(dcmi, pix->pixelformat);
 987         if (!sd_fmt) {
 988                 if (!dcmi->num_of_sd_formats)
 989                         return -ENODATA;
 990
 991                 sd_fmt = dcmi->sd_formats[dcmi->num_of_sd_formats - 1];
 992                 pix->pixelformat = sd_fmt->fourcc;
 993         }
 994
 995         /* Limit to hardware capabilities */
 996         pix->width = clamp(pix->width, MIN_WIDTH, MAX_WIDTH);
 997         pix->height = clamp(pix->height, MIN_HEIGHT, MAX_HEIGHT);
 998
 999         /* No crop if JPEG is requested */
1000         do_crop = dcmi->do_crop && (pix->pixelformat != V4L2_PIX_FMT_JPEG);
1001
1002         if (do_crop && dcmi->num_of_sd_framesizes) {
1003                 struct dcmi_framesize outer_sd_fsize;
1004                 /*
1005                  * If crop is requested and sensor have discrete frame sizes,
1006                  * select the frame size that is just larger than request
1007                  */
1008                 __find_outer_frame_size(dcmi, pix, &outer_sd_fsize);
1009                 pix->width = outer_sd_fsize.width;
1010                 pix->height = outer_sd_fsize.height;
1011         }
1012
1013         v4l2_fill_mbus_format(&format.format, pix, sd_fmt->mbus_code);
1014         ret = v4l2_subdev_call(dcmi->source, pad, set_fmt,
1015                                &pad_cfg, &format);
1016         if (ret < 0)
1017                 return ret;
1018
1019         /* Update pix regarding to what sensor can do */
1020         v4l2_fill_pix_format(pix, &format.format);
1021
1022         /* Save resolution that sensor can actually do */
1023         sd_fsize.width = pix->width;
1024         sd_fsize.height = pix->height;
1025
1026         if (do_crop) {
1027                 struct v4l2_rect c = dcmi->crop;
1028                 struct v4l2_rect max_rect;
1029
1030                 /*
1031                  * Adjust crop by making the intersection between
1032                  * format resolution request and crop request
1033                  */
1034                 max_rect.top = 0;
1035                 max_rect.left = 0;
1036                 max_rect.width = pix->width;
1037                 max_rect.height = pix->height;
1038                 v4l2_rect_map_inside(&c, &max_rect);
1039                 c.top  = clamp_t(s32, c.top, 0, pix->height - c.height);
1040                 c.left = clamp_t(s32, c.left, 0, pix->width - c.width);
1041                 dcmi->crop = c;
1042
1043                 /* Adjust format resolution request to crop */
1044                 pix->width = dcmi->crop.width;
1045                 pix->height = dcmi->crop.height;
1046         }
1047
1048         pix->field = V4L2_FIELD_NONE;
1049         pix->bytesperline = pix->width * sd_fmt->bpp;
1050         pix->sizeimage = pix->bytesperline * pix->height;
1051
1052         if (sd_format)
1053                 *sd_format = sd_fmt;
1054         if (sd_framesize)
1055                 *sd_framesize = sd_fsize;
1056
1057         return 0;
1058 }
1059
1060 static int dcmi_set_fmt(struct stm32_dcmi *dcmi, struct v4l2_format *f)
1061 {
1062         struct v4l2_subdev_format format = {
1063                 .which = V4L2_SUBDEV_FORMAT_ACTIVE,
1064         };
1065         const struct dcmi_format *sd_format;
1066         struct dcmi_framesize sd_framesize;
1067         struct v4l2_mbus_framefmt *mf = &format.format;
1068         struct v4l2_pix_format *pix = &f->fmt.pix;
1069         int ret;
1070
1071         /*
1072          * Try format, fmt.width/height could have been changed
1073          * to match sensor capability or crop request
1074          * sd_format & sd_framesize will contain what subdev
1075          * can do for this request.
1076          */
1077         ret = dcmi_try_fmt(dcmi, f, &sd_format, &sd_framesize);
1078         if (ret)
1079                 return ret;
1080
1081         /* Disable crop if JPEG is requested or BT656 bus is selected */
1082         if (pix->pixelformat == V4L2_PIX_FMT_JPEG &&
1083             dcmi->bus_type != V4L2_MBUS_BT656)
1084                 dcmi->do_crop = false;
1085
1086         /* pix to mbus format */
1087         v4l2_fill_mbus_format(mf, pix,
1088                               sd_format->mbus_code);
1089         mf->width = sd_framesize.width;
1090         mf->height = sd_framesize.height;
1091
1092         ret = dcmi_pipeline_s_fmt(dcmi, NULL, &format);
1093         if (ret < 0)
1094                 return ret;
1095
1096         dev_dbg(dcmi->dev, "Sensor format set to 0x%x %ux%u\n",
1097                 mf->code, mf->width, mf->height);
1098         dev_dbg(dcmi->dev, "Buffer format set to %4.4s %ux%u\n",
1099                 (char *)&pix->pixelformat,
1100                 pix->width, pix->height);
1101
1102         dcmi->fmt = *f;
1103         dcmi->sd_format = sd_format;
1104         dcmi->sd_framesize = sd_framesize;
1105
1106         return 0;
1107 }
1108
1109 static int dcmi_s_fmt_vid_cap(struct file *file, void *priv,
1110                               struct v4l2_format *f)
1111 {
1112         struct stm32_dcmi *dcmi = video_drvdata(file);
1113
1114         if (vb2_is_streaming(&dcmi->queue))
1115                 return -EBUSY;
1116
1117         return dcmi_set_fmt(dcmi, f);
1118 }
1119
1120 static int dcmi_try_fmt_vid_cap(struct file *file, void *priv,
1121                                 struct v4l2_format *f)
1122 {
1123         struct stm32_dcmi *dcmi = video_drvdata(file);
1124
1125         return dcmi_try_fmt(dcmi, f, NULL, NULL);
1126 }
1127
1128 static int dcmi_enum_fmt_vid_cap(struct file *file, void  *priv,
1129                                  struct v4l2_fmtdesc *f)
1130 {
1131         struct stm32_dcmi *dcmi = video_drvdata(file);
1132
1133         if (f->index >= dcmi->num_of_sd_formats)
1134                 return -EINVAL;
1135
1136         f->pixelformat = dcmi->sd_formats[f->index]->fourcc;
1137         return 0;
1138 }
1139
1140 static int dcmi_get_sensor_format(struct stm32_dcmi *dcmi,
1141                                   struct v4l2_pix_format *pix)
1142 {
1143         struct v4l2_subdev_format fmt = {
1144                 .which = V4L2_SUBDEV_FORMAT_ACTIVE,
1145         };
1146         int ret;
1147
1148         ret = v4l2_subdev_call(dcmi->source, pad, get_fmt, NULL, &fmt);
1149         if (ret)
1150                 return ret;
1151
1152         v4l2_fill_pix_format(pix, &fmt.format);
1153
1154         return 0;
1155 }
1156
1157 static int dcmi_set_sensor_format(struct stm32_dcmi *dcmi,
1158                                   struct v4l2_pix_format *pix)
1159 {
1160         const struct dcmi_format *sd_fmt;
1161         struct v4l2_subdev_format format = {
1162                 .which = V4L2_SUBDEV_FORMAT_TRY,
1163         };
1164         struct v4l2_subdev_pad_config pad_cfg;
1165         int ret;
1166
1167         sd_fmt = find_format_by_fourcc(dcmi, pix->pixelformat);
1168         if (!sd_fmt) {
1169                 if (!dcmi->num_of_sd_formats)
1170                         return -ENODATA;
1171
1172                 sd_fmt = dcmi->sd_formats[dcmi->num_of_sd_formats - 1];
1173                 pix->pixelformat = sd_fmt->fourcc;
1174         }
1175
1176         v4l2_fill_mbus_format(&format.format, pix, sd_fmt->mbus_code);
1177         ret = v4l2_subdev_call(dcmi->source, pad, set_fmt,
1178                                &pad_cfg, &format);
1179         if (ret < 0)
1180                 return ret;
1181
1182         return 0;
1183 }
1184
1185 static int dcmi_get_sensor_bounds(struct stm32_dcmi *dcmi,
1186                                   struct v4l2_rect *r)
1187 {
1188         struct v4l2_subdev_selection bounds = {
1189                 .which = V4L2_SUBDEV_FORMAT_ACTIVE,
1190                 .target = V4L2_SEL_TGT_CROP_BOUNDS,
1191         };
1192         unsigned int max_width, max_height, max_pixsize;
1193         struct v4l2_pix_format pix;
1194         unsigned int i;
1195         int ret;
1196
1197         /*
1198          * Get sensor bounds first
1199          */
1200         ret = v4l2_subdev_call(dcmi->source, pad, get_selection,
1201                                NULL, &bounds);
1202         if (!ret)
1203                 *r = bounds.r;
1204         if (ret != -ENOIOCTLCMD)
1205                 return ret;
1206
1207         /*
1208          * If selection is not implemented,
1209          * fallback by enumerating sensor frame sizes
1210          * and take the largest one
1211          */
1212         max_width = 0;
1213         max_height = 0;
1214         max_pixsize = 0;
1215         for (i = 0; i < dcmi->num_of_sd_framesizes; i++) {
1216                 struct dcmi_framesize *fsize = &dcmi->sd_framesizes[i];
1217                 unsigned int pixsize = fsize->width * fsize->height;
1218
1219                 if (pixsize > max_pixsize) {
1220                         max_pixsize = pixsize;
1221                         max_width = fsize->width;
1222                         max_height = fsize->height;
1223                 }
1224         }
1225         if (max_pixsize > 0) {
1226                 r->top = 0;
1227                 r->left = 0;
1228                 r->width = max_width;
1229                 r->height = max_height;
1230                 return 0;
1231         }
1232
1233         /*
1234          * If frame sizes enumeration is not implemented,
1235          * fallback by getting current sensor frame size
1236          */
1237         ret = dcmi_get_sensor_format(dcmi, &pix);
1238         if (ret)
1239                 return ret;
1240
1241         r->top = 0;
1242         r->left = 0;
1243         r->width = pix.width;
1244         r->height = pix.height;
1245
1246         return 0;
1247 }
1248
1249 static int dcmi_g_selection(struct file *file, void *fh,
1250                             struct v4l2_selection *s)
1251 {
1252         struct stm32_dcmi *dcmi = video_drvdata(file);
1253
1254         if (s->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
1255                 return -EINVAL;
1256
1257         switch (s->target) {
1258         case V4L2_SEL_TGT_CROP_DEFAULT:
1259         case V4L2_SEL_TGT_CROP_BOUNDS:
1260                 s->r = dcmi->sd_bounds;
1261                 return 0;
1262         case V4L2_SEL_TGT_CROP:
1263                 if (dcmi->do_crop) {
1264                         s->r = dcmi->crop;
1265                 } else {
1266                         s->r.top = 0;
1267                         s->r.left = 0;
1268                         s->r.width = dcmi->fmt.fmt.pix.width;
1269                         s->r.height = dcmi->fmt.fmt.pix.height;
1270                 }
1271                 break;
1272         default:
1273                 return -EINVAL;
1274         }
1275
1276         return 0;
1277 }
1278
1279 static int dcmi_s_selection(struct file *file, void *priv,
1280                             struct v4l2_selection *s)
1281 {
1282         struct stm32_dcmi *dcmi = video_drvdata(file);
1283         struct v4l2_rect r = s->r;
1284         struct v4l2_rect max_rect;
1285         struct v4l2_pix_format pix;
1286
1287         if (s->type != V4L2_BUF_TYPE_VIDEO_CAPTURE ||
1288             s->target != V4L2_SEL_TGT_CROP)
1289                 return -EINVAL;
1290
1291         /* Reset sensor resolution to max resolution */
1292         pix.pixelformat = dcmi->fmt.fmt.pix.pixelformat;
1293         pix.width = dcmi->sd_bounds.width;
1294         pix.height = dcmi->sd_bounds.height;
1295         dcmi_set_sensor_format(dcmi, &pix);
1296
1297         /*
1298          * Make the intersection between
1299          * sensor resolution
1300          * and crop request
1301          */
1302         max_rect.top = 0;
1303         max_rect.left = 0;
1304         max_rect.width = pix.width;
1305         max_rect.height = pix.height;
1306         v4l2_rect_map_inside(&r, &max_rect);
1307         r.top  = clamp_t(s32, r.top, 0, pix.height - r.height);
1308         r.left = clamp_t(s32, r.left, 0, pix.width - r.width);
1309
1310         if (!(r.top == dcmi->sd_bounds.top &&
1311               r.left == dcmi->sd_bounds.left &&
1312               r.width == dcmi->sd_bounds.width &&
1313               r.height == dcmi->sd_bounds.height)) {
1314                 /* Crop if request is different than sensor resolution */
1315                 dcmi->do_crop = true;
1316                 dcmi->crop = r;
1317                 dev_dbg(dcmi->dev, "s_selection: crop %ux%u@(%u,%u) from %ux%u\n",
1318                         r.width, r.height, r.left, r.top,
1319                         pix.width, pix.height);
1320         } else {
1321                 /* Disable crop */
1322                 dcmi->do_crop = false;
1323                 dev_dbg(dcmi->dev, "s_selection: crop is disabled\n");
1324         }
1325
1326         s->r = r;
1327         return 0;
1328 }
1329
1330 static int dcmi_querycap(struct file *file, void *priv,
1331                          struct v4l2_capability *cap)
1332 {
1333         strscpy(cap->driver, DRV_NAME, sizeof(cap->driver));
1334         strscpy(cap->card, "STM32 Camera Memory Interface",
1335                 sizeof(cap->card));
1336         strscpy(cap->bus_info, "platform:dcmi", sizeof(cap->bus_info));
1337         return 0;
1338 }
1339
1340 static int dcmi_enum_input(struct file *file, void *priv,
1341                            struct v4l2_input *i)
1342 {
1343         if (i->index != 0)
1344                 return -EINVAL;
1345
1346         i->type = V4L2_INPUT_TYPE_CAMERA;
1347         strscpy(i->name, "Camera", sizeof(i->name));
1348         return 0;
1349 }
1350
1351 static int dcmi_g_input(struct file *file, void *priv, unsigned int *i)
1352 {
1353         *i = 0;
1354         return 0;
1355 }
1356
1357 static int dcmi_s_input(struct file *file, void *priv, unsigned int i)
1358 {
1359         if (i > 0)
1360                 return -EINVAL;
1361         return 0;
1362 }
1363
1364 static int dcmi_enum_framesizes(struct file *file, void *fh,
1365                                 struct v4l2_frmsizeenum *fsize)
1366 {
1367         struct stm32_dcmi *dcmi = video_drvdata(file);
1368         const struct dcmi_format *sd_fmt;
1369         struct v4l2_subdev_frame_size_enum fse = {
1370                 .index = fsize->index,
1371                 .which = V4L2_SUBDEV_FORMAT_ACTIVE,
1372         };
1373         int ret;
1374
1375         sd_fmt = find_format_by_fourcc(dcmi, fsize->pixel_format);
1376         if (!sd_fmt)
1377                 return -EINVAL;
1378
1379         fse.code = sd_fmt->mbus_code;
1380
1381         ret = v4l2_subdev_call(dcmi->source, pad, enum_frame_size,
1382                                NULL, &fse);
1383         if (ret)
1384                 return ret;
1385
1386         fsize->type = V4L2_FRMSIZE_TYPE_DISCRETE;
1387         fsize->discrete.width = fse.max_width;
1388         fsize->discrete.height = fse.max_height;
1389
1390         return 0;
1391 }
1392
1393 static int dcmi_g_parm(struct file *file, void *priv,
1394                        struct v4l2_streamparm *p)
1395 {
1396         struct stm32_dcmi *dcmi = video_drvdata(file);
1397
1398         return v4l2_g_parm_cap(video_devdata(file), dcmi->source, p);
1399 }
1400
1401 static int dcmi_s_parm(struct file *file, void *priv,
1402                        struct v4l2_streamparm *p)
1403 {
1404         struct stm32_dcmi *dcmi = video_drvdata(file);
1405
1406         return v4l2_s_parm_cap(video_devdata(file), dcmi->source, p);
1407 }
1408
1409 static int dcmi_enum_frameintervals(struct file *file, void *fh,
1410                                     struct v4l2_frmivalenum *fival)
1411 {
1412         struct stm32_dcmi *dcmi = video_drvdata(file);
1413         const struct dcmi_format *sd_fmt;
1414         struct v4l2_subdev_frame_interval_enum fie = {
1415                 .index = fival->index,
1416                 .width = fival->width,
1417                 .height = fival->height,
1418                 .which = V4L2_SUBDEV_FORMAT_ACTIVE,
1419         };
1420         int ret;
1421
1422         sd_fmt = find_format_by_fourcc(dcmi, fival->pixel_format);
1423         if (!sd_fmt)
1424                 return -EINVAL;
1425
1426         fie.code = sd_fmt->mbus_code;
1427
1428         ret = v4l2_subdev_call(dcmi->source, pad,
1429                                enum_frame_interval, NULL, &fie);
1430         if (ret)
1431                 return ret;
1432
1433         fival->type = V4L2_FRMIVAL_TYPE_DISCRETE;
1434         fival->discrete = fie.interval;
1435
1436         return 0;
1437 }
1438
1439 static const struct of_device_id stm32_dcmi_of_match[] = {
1440         { .compatible = "st,stm32-dcmi"},
1441         { /* end node */ },
1442 };
1443 MODULE_DEVICE_TABLE(of, stm32_dcmi_of_match);
1444
1445 static int dcmi_open(struct file *file)
1446 {
1447         struct stm32_dcmi *dcmi = video_drvdata(file);
1448         struct v4l2_subdev *sd = dcmi->source;
1449         int ret;
1450
1451         if (mutex_lock_interruptible(&dcmi->lock))
1452                 return -ERESTARTSYS;
1453
1454         ret = v4l2_fh_open(file);
1455         if (ret < 0)
1456                 goto unlock;
1457
1458         if (!v4l2_fh_is_singular_file(file))
1459                 goto fh_rel;
1460
1461         ret = v4l2_subdev_call(sd, core, s_power, 1);
1462         if (ret < 0 && ret != -ENOIOCTLCMD)
1463                 goto fh_rel;
1464
1465         ret = dcmi_set_fmt(dcmi, &dcmi->fmt);
1466         if (ret)
1467                 v4l2_subdev_call(sd, core, s_power, 0);
1468 fh_rel:
1469         if (ret)
1470                 v4l2_fh_release(file);
1471 unlock:
1472         mutex_unlock(&dcmi->lock);
1473         return ret;
1474 }
1475
1476 static int dcmi_release(struct file *file)
1477 {
1478         struct stm32_dcmi *dcmi = video_drvdata(file);
1479         struct v4l2_subdev *sd = dcmi->source;
1480         bool fh_singular;
1481         int ret;
1482
1483         mutex_lock(&dcmi->lock);
1484
1485         fh_singular = v4l2_fh_is_singular_file(file);
1486
1487         ret = _vb2_fop_release(file, NULL);
1488
1489         if (fh_singular)
1490                 v4l2_subdev_call(sd, core, s_power, 0);
1491
1492         mutex_unlock(&dcmi->lock);
1493
1494         return ret;
1495 }
1496
1497 static const struct v4l2_ioctl_ops dcmi_ioctl_ops = {
1498         .vidioc_querycap                = dcmi_querycap,
1499
1500         .vidioc_try_fmt_vid_cap         = dcmi_try_fmt_vid_cap,
1501         .vidioc_g_fmt_vid_cap           = dcmi_g_fmt_vid_cap,
1502         .vidioc_s_fmt_vid_cap           = dcmi_s_fmt_vid_cap,
1503         .vidioc_enum_fmt_vid_cap        = dcmi_enum_fmt_vid_cap,
1504         .vidioc_g_selection             = dcmi_g_selection,
1505         .vidioc_s_selection             = dcmi_s_selection,
1506
1507         .vidioc_enum_input              = dcmi_enum_input,
1508         .vidioc_g_input                 = dcmi_g_input,
1509         .vidioc_s_input                 = dcmi_s_input,
1510
1511         .vidioc_g_parm                  = dcmi_g_parm,
1512         .vidioc_s_parm                  = dcmi_s_parm,
1513
1514         .vidioc_enum_framesizes         = dcmi_enum_framesizes,
1515         .vidioc_enum_frameintervals     = dcmi_enum_frameintervals,
1516
1517         .vidioc_reqbufs                 = vb2_ioctl_reqbufs,
1518         .vidioc_create_bufs             = vb2_ioctl_create_bufs,
1519         .vidioc_querybuf                = vb2_ioctl_querybuf,
1520         .vidioc_qbuf                    = vb2_ioctl_qbuf,
1521         .vidioc_dqbuf                   = vb2_ioctl_dqbuf,
1522         .vidioc_expbuf                  = vb2_ioctl_expbuf,
1523         .vidioc_prepare_buf             = vb2_ioctl_prepare_buf,
1524         .vidioc_streamon                = vb2_ioctl_streamon,
1525         .vidioc_streamoff               = vb2_ioctl_streamoff,
1526
1527         .vidioc_log_status              = v4l2_ctrl_log_status,
1528         .vidioc_subscribe_event         = v4l2_ctrl_subscribe_event,
1529         .vidioc_unsubscribe_event       = v4l2_event_unsubscribe,
1530 };
1531
1532 static const struct v4l2_file_operations dcmi_fops = {
1533         .owner          = THIS_MODULE,
1534         .unlocked_ioctl = video_ioctl2,
1535         .open           = dcmi_open,
1536         .release        = dcmi_release,
1537         .poll           = vb2_fop_poll,
1538         .mmap           = vb2_fop_mmap,
1539 #ifndef CONFIG_MMU
1540         .get_unmapped_area = vb2_fop_get_unmapped_area,
1541 #endif
1542         .read           = vb2_fop_read,
1543 };
1544
1545 static int dcmi_set_default_fmt(struct stm32_dcmi *dcmi)
1546 {
1547         struct v4l2_format f = {
1548                 .type = V4L2_BUF_TYPE_VIDEO_CAPTURE,
1549                 .fmt.pix = {
1550                         .width          = CIF_WIDTH,
1551                         .height         = CIF_HEIGHT,
1552                         .field          = V4L2_FIELD_NONE,
1553                         .pixelformat    = dcmi->sd_formats[0]->fourcc,
1554                 },
1555         };
1556         int ret;
1557
1558         ret = dcmi_try_fmt(dcmi, &f, NULL, NULL);
1559         if (ret)
1560                 return ret;
1561         dcmi->sd_format = dcmi->sd_formats[0];
1562         dcmi->fmt = f;
1563         return 0;
1564 }
1565
1566 /*
1567  * FIXME: For the time being we only support subdevices
1568  * which expose RGB & YUV "parallel form" mbus code (_2X8).
1569  * Nevertheless, this allows to support serial source subdevices
1570  * and serial to parallel bridges which conform to this.
1571  */
1572 static const struct dcmi_format dcmi_formats[] = {
1573         {
1574                 .fourcc = V4L2_PIX_FMT_RGB565,
1575                 .mbus_code = MEDIA_BUS_FMT_RGB565_2X8_LE,
1576                 .bpp = 2,
1577         }, {
1578                 .fourcc = V4L2_PIX_FMT_YUYV,
1579                 .mbus_code = MEDIA_BUS_FMT_YUYV8_2X8,
1580                 .bpp = 2,
1581         }, {
1582                 .fourcc = V4L2_PIX_FMT_UYVY,
1583                 .mbus_code = MEDIA_BUS_FMT_UYVY8_2X8,
1584                 .bpp = 2,
1585         }, {
1586                 .fourcc = V4L2_PIX_FMT_JPEG,
1587                 .mbus_code = MEDIA_BUS_FMT_JPEG_1X8,
1588                 .bpp = 1,
1589         }, {
1590                 .fourcc = V4L2_PIX_FMT_SBGGR8,
1591                 .mbus_code = MEDIA_BUS_FMT_SBGGR8_1X8,
1592                 .bpp = 1,
1593         }, {
1594                 .fourcc = V4L2_PIX_FMT_SGBRG8,
1595                 .mbus_code = MEDIA_BUS_FMT_SGBRG8_1X8,
1596                 .bpp = 1,
1597         }, {
1598                 .fourcc = V4L2_PIX_FMT_SGRBG8,
1599                 .mbus_code = MEDIA_BUS_FMT_SGRBG8_1X8,
1600                 .bpp = 1,
1601         }, {
1602                 .fourcc = V4L2_PIX_FMT_SRGGB8,
1603                 .mbus_code = MEDIA_BUS_FMT_SRGGB8_1X8,
1604                 .bpp = 1,
1605         },
1606 };
1607
1608 static int dcmi_formats_init(struct stm32_dcmi *dcmi)
1609 {
1610         const struct dcmi_format *sd_fmts[ARRAY_SIZE(dcmi_formats)];
1611         unsigned int num_fmts = 0, i, j;
1612         struct v4l2_subdev *subdev = dcmi->source;
1613         struct v4l2_subdev_mbus_code_enum mbus_code = {
1614                 .which = V4L2_SUBDEV_FORMAT_ACTIVE,
1615         };
1616
1617         while (!v4l2_subdev_call(subdev, pad, enum_mbus_code,
1618                                  NULL, &mbus_code)) {
1619                 for (i = 0; i < ARRAY_SIZE(dcmi_formats); i++) {
1620                         if (dcmi_formats[i].mbus_code != mbus_code.code)
1621                                 continue;
1622
1623                         /* Exclude JPEG if BT656 bus is selected */
1624                         if (dcmi_formats[i].fourcc == V4L2_PIX_FMT_JPEG &&
1625                             dcmi->bus_type == V4L2_MBUS_BT656)
1626                                 continue;
1627
1628                         /* Code supported, have we got this fourcc yet? */
1629                         for (j = 0; j < num_fmts; j++)
1630                                 if (sd_fmts[j]->fourcc ==
1631                                                 dcmi_formats[i].fourcc) {
1632                                         /* Already available */
1633                                         dev_dbg(dcmi->dev, "Skipping fourcc/code: %4.4s/0x%x\n",
1634                                                 (char *)&sd_fmts[j]->fourcc,
1635                                                 mbus_code.code);
1636                                         break;
1637                                 }
1638                         if (j == num_fmts) {
1639                                 /* New */
1640                                 sd_fmts[num_fmts++] = dcmi_formats + i;
1641                                 dev_dbg(dcmi->dev, "Supported fourcc/code: %4.4s/0x%x\n",
1642                                         (char *)&sd_fmts[num_fmts - 1]->fourcc,
1643                                         sd_fmts[num_fmts - 1]->mbus_code);
1644                         }
1645                 }
1646                 mbus_code.index++;
1647         }
1648
1649         if (!num_fmts)
1650                 return -ENXIO;
1651
1652         dcmi->num_of_sd_formats = num_fmts;
1653         dcmi->sd_formats = devm_kcalloc(dcmi->dev,
1654                                         num_fmts, sizeof(struct dcmi_format *),
1655                                         GFP_KERNEL);
1656         if (!dcmi->sd_formats) {
1657                 dev_err(dcmi->dev, "Could not allocate memory\n");
1658                 return -ENOMEM;
1659         }
1660
1661         memcpy(dcmi->sd_formats, sd_fmts,
1662                num_fmts * sizeof(struct dcmi_format *));
1663         dcmi->sd_format = dcmi->sd_formats[0];
1664
1665         return 0;
1666 }
1667
1668 static int dcmi_framesizes_init(struct stm32_dcmi *dcmi)
1669 {
1670         unsigned int num_fsize = 0;
1671         struct v4l2_subdev *subdev = dcmi->source;
1672         struct v4l2_subdev_frame_size_enum fse = {
1673                 .which = V4L2_SUBDEV_FORMAT_ACTIVE,
1674                 .code = dcmi->sd_format->mbus_code,
1675         };
1676         unsigned int ret;
1677         unsigned int i;
1678
1679         /* Allocate discrete framesizes array */
1680         while (!v4l2_subdev_call(subdev, pad, enum_frame_size,
1681                                  NULL, &fse))
1682                 fse.index++;
1683
1684         num_fsize = fse.index;
1685         if (!num_fsize)
1686                 return 0;
1687
1688         dcmi->num_of_sd_framesizes = num_fsize;
1689         dcmi->sd_framesizes = devm_kcalloc(dcmi->dev, num_fsize,
1690                                            sizeof(struct dcmi_framesize),
1691                                            GFP_KERNEL);
1692         if (!dcmi->sd_framesizes) {
1693                 dev_err(dcmi->dev, "Could not allocate memory\n");
1694                 return -ENOMEM;
1695         }
1696
1697         /* Fill array with sensor supported framesizes */
1698         dev_dbg(dcmi->dev, "Sensor supports %u frame sizes:\n", num_fsize);
1699         for (i = 0; i < dcmi->num_of_sd_framesizes; i++) {
1700                 fse.index = i;
1701                 ret = v4l2_subdev_call(subdev, pad, enum_frame_size,
1702                                        NULL, &fse);
1703                 if (ret)
1704                         return ret;
1705                 dcmi->sd_framesizes[fse.index].width = fse.max_width;
1706                 dcmi->sd_framesizes[fse.index].height = fse.max_height;
1707                 dev_dbg(dcmi->dev, "%ux%u\n", fse.max_width, fse.max_height);
1708         }
1709
1710         return 0;
1711 }
1712
1713 static int dcmi_graph_notify_complete(struct v4l2_async_notifier *notifier)
1714 {
1715         struct stm32_dcmi *dcmi = notifier_to_dcmi(notifier);
1716         int ret;
1717
1718         /*
1719          * Now that the graph is complete,
1720          * we search for the source subdevice
1721          * in order to expose it through V4L2 interface
1722          */
1723         dcmi->source = media_entity_to_v4l2_subdev(dcmi_find_source(dcmi));
1724         if (!dcmi->source) {
1725                 dev_err(dcmi->dev, "Source subdevice not found\n");
1726                 return -ENODEV;
1727         }
1728
1729         dcmi->vdev->ctrl_handler = dcmi->source->ctrl_handler;
1730
1731         ret = dcmi_formats_init(dcmi);
1732         if (ret) {
1733                 dev_err(dcmi->dev, "No supported mediabus format found\n");
1734                 return ret;
1735         }
1736
1737         ret = dcmi_framesizes_init(dcmi);
1738         if (ret) {
1739                 dev_err(dcmi->dev, "Could not initialize framesizes\n");
1740                 return ret;
1741         }
1742
1743         ret = dcmi_get_sensor_bounds(dcmi, &dcmi->sd_bounds);
1744         if (ret) {
1745                 dev_err(dcmi->dev, "Could not get sensor bounds\n");
1746                 return ret;
1747         }
1748
1749         ret = dcmi_set_default_fmt(dcmi);
1750         if (ret) {
1751                 dev_err(dcmi->dev, "Could not set default format\n");
1752                 return ret;
1753         }
1754
1755         return 0;
1756 }
1757
1758 static void dcmi_graph_notify_unbind(struct v4l2_async_notifier *notifier,
1759                                      struct v4l2_subdev *sd,
1760                                      struct v4l2_async_subdev *asd)
1761 {
1762         struct stm32_dcmi *dcmi = notifier_to_dcmi(notifier);
1763
1764         dev_dbg(dcmi->dev, "Removing %s\n", video_device_node_name(dcmi->vdev));
1765
1766         /* Checks internally if vdev has been init or not */
1767         video_unregister_device(dcmi->vdev);
1768 }
1769
1770 static int dcmi_graph_notify_bound(struct v4l2_async_notifier *notifier,
1771                                    struct v4l2_subdev *subdev,
1772                                    struct v4l2_async_subdev *asd)
1773 {
1774         struct stm32_dcmi *dcmi = notifier_to_dcmi(notifier);
1775         unsigned int ret;
1776         int src_pad;
1777
1778         dev_dbg(dcmi->dev, "Subdev \"%s\" bound\n", subdev->name);
1779
1780         /*
1781          * Link this sub-device to DCMI, it could be
1782          * a parallel camera sensor or a bridge
1783          */
1784         src_pad = media_entity_get_fwnode_pad(&subdev->entity,
1785                                               subdev->fwnode,
1786                                               MEDIA_PAD_FL_SOURCE);
1787
1788         ret = media_create_pad_link(&subdev->entity, src_pad,
1789                                     &dcmi->vdev->entity, 0,
1790                                     MEDIA_LNK_FL_IMMUTABLE |
1791                                     MEDIA_LNK_FL_ENABLED);
1792         if (ret)
1793                 dev_err(dcmi->dev, "Failed to create media pad link with subdev \"%s\"\n",
1794                         subdev->name);
1795         else
1796                 dev_dbg(dcmi->dev, "DCMI is now linked to \"%s\"\n",
1797                         subdev->name);
1798
1799         return ret;
1800 }
1801
1802 static const struct v4l2_async_notifier_operations dcmi_graph_notify_ops = {
1803         .bound = dcmi_graph_notify_bound,
1804         .unbind = dcmi_graph_notify_unbind,
1805         .complete = dcmi_graph_notify_complete,
1806 };
1807
1808 static int dcmi_graph_init(struct stm32_dcmi *dcmi)
1809 {
1810         struct v4l2_async_subdev *asd;
1811         struct device_node *ep;
1812         int ret;
1813
1814         ep = of_graph_get_next_endpoint(dcmi->dev->of_node, NULL);
1815         if (!ep) {
1816                 dev_err(dcmi->dev, "Failed to get next endpoint\n");
1817                 return -EINVAL;
1818         }
1819
1820         v4l2_async_notifier_init(&dcmi->notifier);
1821
1822         asd = v4l2_async_notifier_add_fwnode_remote_subdev(
1823                 &dcmi->notifier, of_fwnode_handle(ep),
1824                 struct v4l2_async_subdev);
1825
1826         of_node_put(ep);
1827
1828         if (IS_ERR(asd)) {
1829                 dev_err(dcmi->dev, "Failed to add subdev notifier\n");
1830                 return PTR_ERR(asd);
1831         }
1832
1833         dcmi->notifier.ops = &dcmi_graph_notify_ops;
1834
1835         ret = v4l2_async_notifier_register(&dcmi->v4l2_dev, &dcmi->notifier);
1836         if (ret < 0) {
1837                 dev_err(dcmi->dev, "Failed to register notifier\n");
1838                 v4l2_async_notifier_cleanup(&dcmi->notifier);
1839                 return ret;
1840         }
1841
1842         return 0;
1843 }
1844
1845 static int dcmi_probe(struct platform_device *pdev)
1846 {
1847         struct device_node *np = pdev->dev.of_node;
1848         const struct of_device_id *match = NULL;
1849         struct v4l2_fwnode_endpoint ep = { .bus_type = 0 };
1850         struct stm32_dcmi *dcmi;
1851         struct vb2_queue *q;
1852         struct dma_chan *chan;
1853         struct clk *mclk;
1854         int irq;
1855         int ret = 0;
1856
1857         match = of_match_device(of_match_ptr(stm32_dcmi_of_match), &pdev->dev);
1858         if (!match) {
1859                 dev_err(&pdev->dev, "Could not find a match in devicetree\n");
1860                 return -ENODEV;
1861         }
1862
1863         dcmi = devm_kzalloc(&pdev->dev, sizeof(struct stm32_dcmi), GFP_KERNEL);
1864         if (!dcmi)
1865                 return -ENOMEM;
1866
1867         dcmi->rstc = devm_reset_control_get_exclusive(&pdev->dev, NULL);
1868         if (IS_ERR(dcmi->rstc)) {
1869                 if (PTR_ERR(dcmi->rstc) != -EPROBE_DEFER)
1870                         dev_err(&pdev->dev, "Could not get reset control\n");
1871
1872                 return PTR_ERR(dcmi->rstc);
1873         }
1874
1875         /* Get bus characteristics from devicetree */
1876         np = of_graph_get_next_endpoint(np, NULL);
1877         if (!np) {
1878                 dev_err(&pdev->dev, "Could not find the endpoint\n");
1879                 return -ENODEV;
1880         }
1881
1882         ret = v4l2_fwnode_endpoint_parse(of_fwnode_handle(np), &ep);
1883         of_node_put(np);
1884         if (ret) {
1885                 dev_err(&pdev->dev, "Could not parse the endpoint\n");
1886                 return ret;
1887         }
1888
1889         if (ep.bus_type == V4L2_MBUS_CSI2_DPHY) {
1890                 dev_err(&pdev->dev, "CSI bus not supported\n");
1891                 return -ENODEV;
1892         }
1893
1894         if (ep.bus_type == V4L2_MBUS_BT656 &&
1895             ep.bus.parallel.bus_width != 8) {
1896                 dev_err(&pdev->dev, "BT656 bus conflicts with %u bits bus width (8 bits required)\n",
1897                         ep.bus.parallel.bus_width);
1898                 return -ENODEV;
1899         }
1900
1901         dcmi->bus.flags = ep.bus.parallel.flags;
1902         dcmi->bus.bus_width = ep.bus.parallel.bus_width;
1903         dcmi->bus.data_shift = ep.bus.parallel.data_shift;
1904         dcmi->bus_type = ep.bus_type;
1905
1906         irq = platform_get_irq(pdev, 0);
1907         if (irq <= 0)
1908                 return irq ? irq : -ENXIO;
1909
1910         dcmi->res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1911         if (!dcmi->res) {
1912                 dev_err(&pdev->dev, "Could not get resource\n");
1913                 return -ENODEV;
1914         }
1915
1916         dcmi->regs = devm_ioremap_resource(&pdev->dev, dcmi->res);
1917         if (IS_ERR(dcmi->regs)) {
1918                 dev_err(&pdev->dev, "Could not map registers\n");
1919                 return PTR_ERR(dcmi->regs);
1920         }
1921
1922         ret = devm_request_threaded_irq(&pdev->dev, irq, dcmi_irq_callback,
1923                                         dcmi_irq_thread, IRQF_ONESHOT,
1924                                         dev_name(&pdev->dev), dcmi);
1925         if (ret) {
1926                 dev_err(&pdev->dev, "Unable to request irq %d\n", irq);
1927                 return ret;
1928         }
1929
1930         mclk = devm_clk_get(&pdev->dev, "mclk");
1931         if (IS_ERR(mclk)) {
1932                 if (PTR_ERR(mclk) != -EPROBE_DEFER)
1933                         dev_err(&pdev->dev, "Unable to get mclk\n");
1934                 return PTR_ERR(mclk);
1935         }
1936
1937         chan = dma_request_chan(&pdev->dev, "tx");
1938         if (IS_ERR(chan)) {
1939                 ret = PTR_ERR(chan);
1940                 if (ret != -EPROBE_DEFER)
1941                         dev_err(&pdev->dev,
1942                                 "Failed to request DMA channel: %d\n", ret);
1943                 return ret;
1944         }
1945
1946         spin_lock_init(&dcmi->irqlock);
1947         mutex_init(&dcmi->lock);
1948         mutex_init(&dcmi->dma_lock);
1949         init_completion(&dcmi->complete);
1950         INIT_LIST_HEAD(&dcmi->buffers);
1951
1952         dcmi->dev = &pdev->dev;
1953         dcmi->mclk = mclk;
1954         dcmi->state = STOPPED;
1955         dcmi->dma_chan = chan;
1956
1957         q = &dcmi->queue;
1958
1959         dcmi->v4l2_dev.mdev = &dcmi->mdev;
1960
1961         /* Initialize media device */
1962         strscpy(dcmi->mdev.model, DRV_NAME, sizeof(dcmi->mdev.model));
1963         snprintf(dcmi->mdev.bus_info, sizeof(dcmi->mdev.bus_info),
1964                  "platform:%s", DRV_NAME);
1965         dcmi->mdev.dev = &pdev->dev;
1966         media_device_init(&dcmi->mdev);
1967
1968         /* Initialize the top-level structure */
1969         ret = v4l2_device_register(&pdev->dev, &dcmi->v4l2_dev);
1970         if (ret)
1971                 goto err_media_device_cleanup;
1972
1973         dcmi->vdev = video_device_alloc();
1974         if (!dcmi->vdev) {
1975                 ret = -ENOMEM;
1976                 goto err_device_unregister;
1977         }
1978
1979         /* Video node */
1980         dcmi->vdev->fops = &dcmi_fops;
1981         dcmi->vdev->v4l2_dev = &dcmi->v4l2_dev;
1982         dcmi->vdev->queue = &dcmi->queue;
1983         strscpy(dcmi->vdev->name, KBUILD_MODNAME, sizeof(dcmi->vdev->name));
1984         dcmi->vdev->release = video_device_release;
1985         dcmi->vdev->ioctl_ops = &dcmi_ioctl_ops;
1986         dcmi->vdev->lock = &dcmi->lock;
1987         dcmi->vdev->device_caps = V4L2_CAP_VIDEO_CAPTURE | V4L2_CAP_STREAMING |
1988                                   V4L2_CAP_READWRITE;
1989         video_set_drvdata(dcmi->vdev, dcmi);
1990
1991         /* Media entity pads */
1992         dcmi->vid_cap_pad.flags = MEDIA_PAD_FL_SINK;
1993         ret = media_entity_pads_init(&dcmi->vdev->entity,
1994                                      1, &dcmi->vid_cap_pad);
1995         if (ret) {
1996                 dev_err(dcmi->dev, "Failed to init media entity pad\n");
1997                 goto err_device_release;
1998         }
1999         dcmi->vdev->entity.flags |= MEDIA_ENT_FL_DEFAULT;
2000
2001         ret = video_register_device(dcmi->vdev, VFL_TYPE_VIDEO, -1);
2002         if (ret) {
2003                 dev_err(dcmi->dev, "Failed to register video device\n");
2004                 goto err_media_entity_cleanup;
2005         }
2006
2007         dev_dbg(dcmi->dev, "Device registered as %s\n",
2008                 video_device_node_name(dcmi->vdev));
2009
2010         /* Buffer queue */
2011         q->type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
2012         q->io_modes = VB2_MMAP | VB2_READ | VB2_DMABUF;
2013         q->lock = &dcmi->lock;
2014         q->drv_priv = dcmi;
2015         q->buf_struct_size = sizeof(struct dcmi_buf);
2016         q->ops = &dcmi_video_qops;
2017         q->mem_ops = &vb2_dma_contig_memops;
2018         q->timestamp_flags = V4L2_BUF_FLAG_TIMESTAMP_MONOTONIC;
2019         q->min_buffers_needed = 2;
2020         q->dev = &pdev->dev;
2021
2022         ret = vb2_queue_init(q);
2023         if (ret < 0) {
2024                 dev_err(&pdev->dev, "Failed to initialize vb2 queue\n");
2025                 goto err_media_entity_cleanup;
2026         }
2027
2028         ret = dcmi_graph_init(dcmi);
2029         if (ret < 0)
2030                 goto err_media_entity_cleanup;
2031
2032         /* Reset device */
2033         ret = reset_control_assert(dcmi->rstc);
2034         if (ret) {
2035                 dev_err(&pdev->dev, "Failed to assert the reset line\n");
2036                 goto err_cleanup;
2037         }
2038
2039         usleep_range(3000, 5000);
2040
2041         ret = reset_control_deassert(dcmi->rstc);
2042         if (ret) {
2043                 dev_err(&pdev->dev, "Failed to deassert the reset line\n");
2044                 goto err_cleanup;
2045         }
2046
2047         dev_info(&pdev->dev, "Probe done\n");
2048
2049         platform_set_drvdata(pdev, dcmi);
2050
2051         pm_runtime_enable(&pdev->dev);
2052
2053         return 0;
2054
2055 err_cleanup:
2056         v4l2_async_notifier_cleanup(&dcmi->notifier);
2057 err_media_entity_cleanup:
2058         media_entity_cleanup(&dcmi->vdev->entity);
2059 err_device_release:
2060         video_device_release(dcmi->vdev);
2061 err_device_unregister:
2062         v4l2_device_unregister(&dcmi->v4l2_dev);
2063 err_media_device_cleanup:
2064         media_device_cleanup(&dcmi->mdev);
2065         dma_release_channel(dcmi->dma_chan);
2066
2067         return ret;
2068 }
2069
2070 static int dcmi_remove(struct platform_device *pdev)
2071 {
2072         struct stm32_dcmi *dcmi = platform_get_drvdata(pdev);
2073
2074         pm_runtime_disable(&pdev->dev);
2075
2076         v4l2_async_notifier_unregister(&dcmi->notifier);
2077         v4l2_async_notifier_cleanup(&dcmi->notifier);
2078         media_entity_cleanup(&dcmi->vdev->entity);
2079         v4l2_device_unregister(&dcmi->v4l2_dev);
2080         media_device_cleanup(&dcmi->mdev);
2081
2082         dma_release_channel(dcmi->dma_chan);
2083
2084         return 0;
2085 }
2086
2087 static __maybe_unused int dcmi_runtime_suspend(struct device *dev)
2088 {
2089         struct stm32_dcmi *dcmi = dev_get_drvdata(dev);
2090
2091         clk_disable_unprepare(dcmi->mclk);
2092
2093         return 0;
2094 }
2095
2096 static __maybe_unused int dcmi_runtime_resume(struct device *dev)
2097 {
2098         struct stm32_dcmi *dcmi = dev_get_drvdata(dev);
2099         int ret;
2100
2101         ret = clk_prepare_enable(dcmi->mclk);
2102         if (ret)
2103                 dev_err(dev, "%s: Failed to prepare_enable clock\n", __func__);
2104
2105         return ret;
2106 }
2107
2108 static __maybe_unused int dcmi_suspend(struct device *dev)
2109 {
2110         /* disable clock */
2111         pm_runtime_force_suspend(dev);
2112
2113         /* change pinctrl state */
2114         pinctrl_pm_select_sleep_state(dev);
2115
2116         return 0;
2117 }
2118
2119 static __maybe_unused int dcmi_resume(struct device *dev)
2120 {
2121         /* restore pinctl default state */
2122         pinctrl_pm_select_default_state(dev);
2123
2124         /* clock enable */
2125         pm_runtime_force_resume(dev);
2126
2127         return 0;
2128 }
2129
2130 static const struct dev_pm_ops dcmi_pm_ops = {
2131         SET_SYSTEM_SLEEP_PM_OPS(dcmi_suspend, dcmi_resume)
2132         SET_RUNTIME_PM_OPS(dcmi_runtime_suspend,
2133                            dcmi_runtime_resume, NULL)
2134 };
2135
2136 static struct platform_driver stm32_dcmi_driver = {
2137         .probe          = dcmi_probe,
2138         .remove         = dcmi_remove,
2139         .driver         = {
2140                 .name = DRV_NAME,
2141                 .of_match_table = of_match_ptr(stm32_dcmi_of_match),
2142                 .pm = &dcmi_pm_ops,
2143         },
2144 };
2145
2146 module_platform_driver(stm32_dcmi_driver);
2147
2148 MODULE_AUTHOR("Yannick Fertre <[email protected]>");
2149 MODULE_AUTHOR("Hugues Fruchet <[email protected]>");
2150 MODULE_DESCRIPTION("STMicroelectronics STM32 Digital Camera Memory Interface driver");
2151 MODULE_LICENSE("GPL");