drivers/media/platform/st/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 <yannick.fertre@st.com>
   7  *          Hugues Fruchet <hugues.fruchet@st.com>
   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         struct sg_table         sgt;
 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         int                     irq;
 132
 133         struct v4l2_device              v4l2_dev;
 134         struct video_device             *vdev;
 135         struct v4l2_async_notifier      notifier;
 136         struct v4l2_subdev              *source;
 137         struct v4l2_format              fmt;
 138         struct v4l2_rect                crop;
 139         bool                            do_crop;
 140
 141         const struct dcmi_format        **sd_formats;
 142         unsigned int                    num_of_sd_formats;
 143         const struct dcmi_format        *sd_format;
 144         struct dcmi_framesize           *sd_framesizes;
 145         unsigned int                    num_of_sd_framesizes;
 146         struct dcmi_framesize           sd_framesize;
 147         struct v4l2_rect                sd_bounds;
 148
 149         /* Protect this data structure */
 150         struct mutex                    lock;
 151         struct vb2_queue                queue;
 152
 153         struct v4l2_mbus_config_parallel        bus;
 154         enum v4l2_mbus_type             bus_type;
 155         struct completion               complete;
 156         struct clk                      *mclk;
 157         enum state                      state;
 158         struct dma_chan                 *dma_chan;
 159         dma_cookie_t                    dma_cookie;
 160         u32                             dma_max_burst;
 161         u32                             misr;
 162         int                             errors_count;
 163         int                             overrun_count;
 164         int                             buffers_count;
 165
 166         /* Ensure DMA operations atomicity */
 167         struct mutex                    dma_lock;
 168
 169         struct media_device             mdev;
 170         struct media_pad                vid_cap_pad;
 171         struct media_pipeline           pipeline;
 172 };
 173
 174 static inline struct stm32_dcmi *notifier_to_dcmi(struct v4l2_async_notifier *n)
 175 {
 176         return container_of(n, struct stm32_dcmi, notifier);
 177 }
 178
 179 static inline u32 reg_read(void __iomem *base, u32 reg)
 180 {
 181         return readl_relaxed(base + reg);
 182 }
 183
 184 static inline void reg_write(void __iomem *base, u32 reg, u32 val)
 185 {
 186         writel_relaxed(val, base + reg);
 187 }
 188
 189 static inline void reg_set(void __iomem *base, u32 reg, u32 mask)
 190 {
 191         reg_write(base, reg, reg_read(base, reg) | mask);
 192 }
 193
 194 static inline void reg_clear(void __iomem *base, u32 reg, u32 mask)
 195 {
 196         reg_write(base, reg, reg_read(base, reg) & ~mask);
 197 }
 198
 199 static int dcmi_start_capture(struct stm32_dcmi *dcmi, struct dcmi_buf *buf);
 200
 201 static void dcmi_buffer_done(struct stm32_dcmi *dcmi,
 202                              struct dcmi_buf *buf,
 203                              size_t bytesused,
 204                              int err)
 205 {
 206         struct vb2_v4l2_buffer *vbuf;
 207
 208         if (!buf)
 209                 return;
 210
 211         list_del_init(&buf->list);
 212
 213         vbuf = &buf->vb;
 214
 215         vbuf->sequence = dcmi->sequence++;
 216         vbuf->field = V4L2_FIELD_NONE;
 217         vbuf->vb2_buf.timestamp = ktime_get_ns();
 218         vb2_set_plane_payload(&vbuf->vb2_buf, 0, bytesused);
 219         vb2_buffer_done(&vbuf->vb2_buf,
 220                         err ? VB2_BUF_STATE_ERROR : VB2_BUF_STATE_DONE);
 221         dev_dbg(dcmi->dev, "buffer[%d] done seq=%d, bytesused=%zu\n",
 222                 vbuf->vb2_buf.index, vbuf->sequence, bytesused);
 223
 224         dcmi->buffers_count++;
 225         dcmi->active = NULL;
 226 }
 227
 228 static int dcmi_restart_capture(struct stm32_dcmi *dcmi)
 229 {
 230         struct dcmi_buf *buf;
 231
 232         spin_lock_irq(&dcmi->irqlock);
 233
 234         if (dcmi->state != RUNNING) {
 235                 spin_unlock_irq(&dcmi->irqlock);
 236                 return -EINVAL;
 237         }
 238
 239         /* Restart a new DMA transfer with next buffer */
 240         if (list_empty(&dcmi->buffers)) {
 241                 dev_dbg(dcmi->dev, "Capture restart is deferred to next buffer queueing\n");
 242                 dcmi->state = WAIT_FOR_BUFFER;
 243                 spin_unlock_irq(&dcmi->irqlock);
 244                 return 0;
 245         }
 246         buf = list_entry(dcmi->buffers.next, struct dcmi_buf, list);
 247         dcmi->active = buf;
 248
 249         spin_unlock_irq(&dcmi->irqlock);
 250
 251         return dcmi_start_capture(dcmi, buf);
 252 }
 253
 254 static void dcmi_dma_callback(void *param)
 255 {
 256         struct stm32_dcmi *dcmi = (struct stm32_dcmi *)param;
 257         struct dma_tx_state state;
 258         enum dma_status status;
 259         struct dcmi_buf *buf = dcmi->active;
 260
 261         spin_lock_irq(&dcmi->irqlock);
 262
 263         /* Check DMA status */
 264         status = dmaengine_tx_status(dcmi->dma_chan, dcmi->dma_cookie, &state);
 265
 266         switch (status) {
 267         case DMA_IN_PROGRESS:
 268                 dev_dbg(dcmi->dev, "%s: Received DMA_IN_PROGRESS\n", __func__);
 269                 break;
 270         case DMA_PAUSED:
 271                 dev_err(dcmi->dev, "%s: Received DMA_PAUSED\n", __func__);
 272                 break;
 273         case DMA_ERROR:
 274                 dev_err(dcmi->dev, "%s: Received DMA_ERROR\n", __func__);
 275
 276                 /* Return buffer to V4L2 in error state */
 277                 dcmi_buffer_done(dcmi, buf, 0, -EIO);
 278                 break;
 279         case DMA_COMPLETE:
 280                 dev_dbg(dcmi->dev, "%s: Received DMA_COMPLETE\n", __func__);
 281
 282                 /* Return buffer to V4L2 */
 283                 dcmi_buffer_done(dcmi, buf, buf->size, 0);
 284
 285                 spin_unlock_irq(&dcmi->irqlock);
 286
 287                 /* Restart capture */
 288                 if (dcmi_restart_capture(dcmi))
 289                         dev_err(dcmi->dev, "%s: Cannot restart capture on DMA complete\n",
 290                                 __func__);
 291                 return;
 292         default:
 293                 dev_err(dcmi->dev, "%s: Received unknown status\n", __func__);
 294                 break;
 295         }
 296
 297         spin_unlock_irq(&dcmi->irqlock);
 298 }
 299
 300 static int dcmi_start_dma(struct stm32_dcmi *dcmi,
 301                           struct dcmi_buf *buf)
 302 {
 303         struct dma_async_tx_descriptor *desc = NULL;
 304         struct dma_slave_config config;
 305         int ret;
 306
 307         memset(&config, 0, sizeof(config));
 308
 309         config.src_addr = (dma_addr_t)dcmi->res->start + DCMI_DR;
 310         config.src_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
 311         config.dst_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
 312         config.dst_maxburst = 4;
 313
 314         /* Configure DMA channel */
 315         ret = dmaengine_slave_config(dcmi->dma_chan, &config);
 316         if (ret < 0) {
 317                 dev_err(dcmi->dev, "%s: DMA channel config failed (%d)\n",
 318                         __func__, ret);
 319                 return ret;
 320         }
 321
 322         /*
 323          * Avoid call of dmaengine_terminate_sync() between
 324          * dmaengine_prep_slave_single() and dmaengine_submit()
 325          * by locking the whole DMA submission sequence
 326          */
 327         mutex_lock(&dcmi->dma_lock);
 328
 329         /* Prepare a DMA transaction */
 330         desc = dmaengine_prep_slave_sg(dcmi->dma_chan, buf->sgt.sgl, buf->sgt.nents,
 331                                        DMA_DEV_TO_MEM,
 332                                        DMA_PREP_INTERRUPT);
 333         if (!desc) {
 334                 dev_err(dcmi->dev, "%s: DMA dmaengine_prep_slave_sg failed\n", __func__);
 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         unsigned int num_sgs = 1;
 527         dma_addr_t dma_buf;
 528         struct scatterlist *sg;
 529         int i, ret;
 530
 531         size = dcmi->fmt.fmt.pix.sizeimage;
 532
 533         if (vb2_plane_size(vb, 0) < size) {
 534                 dev_err(dcmi->dev, "%s data will not fit into plane (%lu < %lu)\n",
 535                         __func__, vb2_plane_size(vb, 0), size);
 536                 return -EINVAL;
 537         }
 538
 539         vb2_set_plane_payload(vb, 0, size);
 540
 541         if (!buf->prepared) {
 542                 /* Get memory addresses */
 543                 buf->size = vb2_plane_size(&buf->vb.vb2_buf, 0);
 544                 if (buf->size > dcmi->dma_max_burst)
 545                         num_sgs = DIV_ROUND_UP(buf->size, dcmi->dma_max_burst);
 546
 547                 ret = sg_alloc_table(&buf->sgt, num_sgs, GFP_ATOMIC);
 548                 if (ret) {
 549                         dev_err(dcmi->dev, "sg table alloc failed\n");
 550                         return ret;
 551                 }
 552
 553                 dma_buf = vb2_dma_contig_plane_dma_addr(&buf->vb.vb2_buf, 0);
 554
 555                 dev_dbg(dcmi->dev, "buffer[%d] phy=%pad size=%zu\n",
 556                         vb->index, &dma_buf, buf->size);
 557
 558                 for_each_sg(buf->sgt.sgl, sg, num_sgs, i) {
 559                         size_t bytes = min_t(size_t, size, dcmi->dma_max_burst);
 560
 561                         sg_dma_address(sg) = dma_buf;
 562                         sg_dma_len(sg) = bytes;
 563                         dma_buf += bytes;
 564                         size -= bytes;
 565                 }
 566
 567                 buf->prepared = true;
 568
 569                 vb2_set_plane_payload(&buf->vb.vb2_buf, 0, buf->size);
 570         }
 571
 572         return 0;
 573 }
 574
 575 static void dcmi_buf_queue(struct vb2_buffer *vb)
 576 {
 577         struct stm32_dcmi *dcmi =  vb2_get_drv_priv(vb->vb2_queue);
 578         struct vb2_v4l2_buffer *vbuf = to_vb2_v4l2_buffer(vb);
 579         struct dcmi_buf *buf = container_of(vbuf, struct dcmi_buf, vb);
 580
 581         spin_lock_irq(&dcmi->irqlock);
 582
 583         /* Enqueue to video buffers list */
 584         list_add_tail(&buf->list, &dcmi->buffers);
 585
 586         if (dcmi->state == WAIT_FOR_BUFFER) {
 587                 dcmi->state = RUNNING;
 588                 dcmi->active = buf;
 589
 590                 dev_dbg(dcmi->dev, "Starting capture on buffer[%d] queued\n",
 591                         buf->vb.vb2_buf.index);
 592
 593                 spin_unlock_irq(&dcmi->irqlock);
 594                 if (dcmi_start_capture(dcmi, buf))
 595                         dev_err(dcmi->dev, "%s: Cannot restart capture on overflow or error\n",
 596                                 __func__);
 597                 return;
 598         }
 599
 600         spin_unlock_irq(&dcmi->irqlock);
 601 }
 602
 603 static struct media_entity *dcmi_find_source(struct stm32_dcmi *dcmi)
 604 {
 605         struct media_entity *entity = &dcmi->vdev->entity;
 606         struct media_pad *pad;
 607
 608         /* Walk searching for entity having no sink */
 609         while (1) {
 610                 pad = &entity->pads[0];
 611                 if (!(pad->flags & MEDIA_PAD_FL_SINK))
 612                         break;
 613
 614                 pad = media_pad_remote_pad_first(pad);
 615                 if (!pad || !is_media_entity_v4l2_subdev(pad->entity))
 616                         break;
 617
 618                 entity = pad->entity;
 619         }
 620
 621         return entity;
 622 }
 623
 624 static int dcmi_pipeline_s_fmt(struct stm32_dcmi *dcmi,
 625                                struct v4l2_subdev_format *format)
 626 {
 627         struct media_entity *entity = &dcmi->source->entity;
 628         struct v4l2_subdev *subdev;
 629         struct media_pad *sink_pad = NULL;
 630         struct media_pad *src_pad = NULL;
 631         struct media_pad *pad = NULL;
 632         struct v4l2_subdev_format fmt = *format;
 633         bool found = false;
 634         int ret;
 635
 636         /*
 637          * Starting from sensor subdevice, walk within
 638          * pipeline and set format on each subdevice
 639          */
 640         while (1) {
 641                 unsigned int i;
 642
 643                 /* Search if current entity has a source pad */
 644                 for (i = 0; i < entity->num_pads; i++) {
 645                         pad = &entity->pads[i];
 646                         if (pad->flags & MEDIA_PAD_FL_SOURCE) {
 647                                 src_pad = pad;
 648                                 found = true;
 649                                 break;
 650                         }
 651                 }
 652                 if (!found)
 653                         break;
 654
 655                 subdev = media_entity_to_v4l2_subdev(entity);
 656
 657                 /* Propagate format on sink pad if any, otherwise source pad */
 658                 if (sink_pad)
 659                         pad = sink_pad;
 660
 661                 dev_dbg(dcmi->dev, "\"%s\":%d pad format set to 0x%x %ux%u\n",
 662                         subdev->name, pad->index, format->format.code,
 663                         format->format.width, format->format.height);
 664
 665                 fmt.pad = pad->index;
 666                 ret = v4l2_subdev_call(subdev, pad, set_fmt, NULL, &fmt);
 667                 if (ret < 0) {
 668                         dev_err(dcmi->dev, "%s: Failed to set format 0x%x %ux%u on \"%s\":%d pad (%d)\n",
 669                                 __func__, format->format.code,
 670                                 format->format.width, format->format.height,
 671                                 subdev->name, pad->index, ret);
 672                         return ret;
 673                 }
 674
 675                 if (fmt.format.code != format->format.code ||
 676                     fmt.format.width != format->format.width ||
 677                     fmt.format.height != format->format.height) {
 678                         dev_dbg(dcmi->dev, "\"%s\":%d pad format has been changed to 0x%x %ux%u\n",
 679                                 subdev->name, pad->index, fmt.format.code,
 680                                 fmt.format.width, fmt.format.height);
 681                 }
 682
 683                 /* Walk to next entity */
 684                 sink_pad = media_pad_remote_pad_first(src_pad);
 685                 if (!sink_pad || !is_media_entity_v4l2_subdev(sink_pad->entity))
 686                         break;
 687
 688                 entity = sink_pad->entity;
 689         }
 690         *format = fmt;
 691
 692         return 0;
 693 }
 694
 695 static int dcmi_pipeline_s_stream(struct stm32_dcmi *dcmi, int state)
 696 {
 697         struct media_entity *entity = &dcmi->vdev->entity;
 698         struct v4l2_subdev *subdev;
 699         struct media_pad *pad;
 700         int ret;
 701
 702         /* Start/stop all entities within pipeline */
 703         while (1) {
 704                 pad = &entity->pads[0];
 705                 if (!(pad->flags & MEDIA_PAD_FL_SINK))
 706                         break;
 707
 708                 pad = media_pad_remote_pad_first(pad);
 709                 if (!pad || !is_media_entity_v4l2_subdev(pad->entity))
 710                         break;
 711
 712                 entity = pad->entity;
 713                 subdev = media_entity_to_v4l2_subdev(entity);
 714
 715                 ret = v4l2_subdev_call(subdev, video, s_stream, state);
 716                 if (ret < 0 && ret != -ENOIOCTLCMD) {
 717                         dev_err(dcmi->dev, "%s: \"%s\" failed to %s streaming (%d)\n",
 718                                 __func__, subdev->name,
 719                                 state ? "start" : "stop", ret);
 720                         return ret;
 721                 }
 722
 723                 dev_dbg(dcmi->dev, "\"%s\" is %s\n",
 724                         subdev->name, state ? "started" : "stopped");
 725         }
 726
 727         return 0;
 728 }
 729
 730 static int dcmi_pipeline_start(struct stm32_dcmi *dcmi)
 731 {
 732         return dcmi_pipeline_s_stream(dcmi, 1);
 733 }
 734
 735 static void dcmi_pipeline_stop(struct stm32_dcmi *dcmi)
 736 {
 737         dcmi_pipeline_s_stream(dcmi, 0);
 738 }
 739
 740 static int dcmi_start_streaming(struct vb2_queue *vq, unsigned int count)
 741 {
 742         struct stm32_dcmi *dcmi = vb2_get_drv_priv(vq);
 743         struct dcmi_buf *buf, *node;
 744         u32 val = 0;
 745         int ret;
 746
 747         ret = pm_runtime_resume_and_get(dcmi->dev);
 748         if (ret < 0) {
 749                 dev_err(dcmi->dev, "%s: Failed to start streaming, cannot get sync (%d)\n",
 750                         __func__, ret);
 751                 goto err_unlocked;
 752         }
 753
 754         ret = video_device_pipeline_start(dcmi->vdev, &dcmi->pipeline);
 755         if (ret < 0) {
 756                 dev_err(dcmi->dev, "%s: Failed to start streaming, media pipeline start error (%d)\n",
 757                         __func__, ret);
 758                 goto err_pm_put;
 759         }
 760
 761         ret = dcmi_pipeline_start(dcmi);
 762         if (ret)
 763                 goto err_media_pipeline_stop;
 764
 765         spin_lock_irq(&dcmi->irqlock);
 766
 767         /* Set bus width */
 768         switch (dcmi->bus.bus_width) {
 769         case 14:
 770                 val |= CR_EDM_0 | CR_EDM_1;
 771                 break;
 772         case 12:
 773                 val |= CR_EDM_1;
 774                 break;
 775         case 10:
 776                 val |= CR_EDM_0;
 777                 break;
 778         default:
 779                 /* Set bus width to 8 bits by default */
 780                 break;
 781         }
 782
 783         /* Set vertical synchronization polarity */
 784         if (dcmi->bus.flags & V4L2_MBUS_VSYNC_ACTIVE_HIGH)
 785                 val |= CR_VSPOL;
 786
 787         /* Set horizontal synchronization polarity */
 788         if (dcmi->bus.flags & V4L2_MBUS_HSYNC_ACTIVE_HIGH)
 789                 val |= CR_HSPOL;
 790
 791         /* Set pixel clock polarity */
 792         if (dcmi->bus.flags & V4L2_MBUS_PCLK_SAMPLE_RISING)
 793                 val |= CR_PCKPOL;
 794
 795         /*
 796          * BT656 embedded synchronisation bus mode.
 797          *
 798          * Default SAV/EAV mode is supported here with default codes
 799          * SAV=0xff000080 & EAV=0xff00009d.
 800          * With DCMI this means LSC=SAV=0x80 & LEC=EAV=0x9d.
 801          */
 802         if (dcmi->bus_type == V4L2_MBUS_BT656) {
 803                 val |= CR_ESS;
 804
 805                 /* Unmask all codes */
 806                 reg_write(dcmi->regs, DCMI_ESUR, 0xffffffff);/* FEC:LEC:LSC:FSC */
 807
 808                 /* Trig on LSC=0x80 & LEC=0x9d codes, ignore FSC and FEC */
 809                 reg_write(dcmi->regs, DCMI_ESCR, 0xff9d80ff);/* FEC:LEC:LSC:FSC */
 810         }
 811
 812         reg_write(dcmi->regs, DCMI_CR, val);
 813
 814         /* Set crop */
 815         if (dcmi->do_crop)
 816                 dcmi_set_crop(dcmi);
 817
 818         /* Enable jpeg capture */
 819         if (dcmi->sd_format->fourcc == V4L2_PIX_FMT_JPEG)
 820                 reg_set(dcmi->regs, DCMI_CR, CR_CM);/* Snapshot mode */
 821
 822         /* Enable dcmi */
 823         reg_set(dcmi->regs, DCMI_CR, CR_ENABLE);
 824
 825         dcmi->sequence = 0;
 826         dcmi->errors_count = 0;
 827         dcmi->overrun_count = 0;
 828         dcmi->buffers_count = 0;
 829
 830         /*
 831          * Start transfer if at least one buffer has been queued,
 832          * otherwise transfer is deferred at buffer queueing
 833          */
 834         if (list_empty(&dcmi->buffers)) {
 835                 dev_dbg(dcmi->dev, "Start streaming is deferred to next buffer queueing\n");
 836                 dcmi->state = WAIT_FOR_BUFFER;
 837                 spin_unlock_irq(&dcmi->irqlock);
 838                 return 0;
 839         }
 840
 841         buf = list_entry(dcmi->buffers.next, struct dcmi_buf, list);
 842         dcmi->active = buf;
 843
 844         dcmi->state = RUNNING;
 845
 846         dev_dbg(dcmi->dev, "Start streaming, starting capture\n");
 847
 848         spin_unlock_irq(&dcmi->irqlock);
 849         ret = dcmi_start_capture(dcmi, buf);
 850         if (ret) {
 851                 dev_err(dcmi->dev, "%s: Start streaming failed, cannot start capture\n",
 852                         __func__);
 853                 goto err_pipeline_stop;
 854         }
 855
 856         /* Enable interruptions */
 857         if (dcmi->sd_format->fourcc == V4L2_PIX_FMT_JPEG)
 858                 reg_set(dcmi->regs, DCMI_IER, IT_FRAME | IT_OVR | IT_ERR);
 859         else
 860                 reg_set(dcmi->regs, DCMI_IER, IT_OVR | IT_ERR);
 861
 862         return 0;
 863
 864 err_pipeline_stop:
 865         dcmi_pipeline_stop(dcmi);
 866
 867 err_media_pipeline_stop:
 868         video_device_pipeline_stop(dcmi->vdev);
 869
 870 err_pm_put:
 871         pm_runtime_put(dcmi->dev);
 872 err_unlocked:
 873         spin_lock_irq(&dcmi->irqlock);
 874         /*
 875          * Return all buffers to vb2 in QUEUED state.
 876          * This will give ownership back to userspace
 877          */
 878         list_for_each_entry_safe(buf, node, &dcmi->buffers, list) {
 879                 list_del_init(&buf->list);
 880                 vb2_buffer_done(&buf->vb.vb2_buf, VB2_BUF_STATE_QUEUED);
 881         }
 882         dcmi->active = NULL;
 883         spin_unlock_irq(&dcmi->irqlock);
 884
 885         return ret;
 886 }
 887
 888 static void dcmi_stop_streaming(struct vb2_queue *vq)
 889 {
 890         struct stm32_dcmi *dcmi = vb2_get_drv_priv(vq);
 891         struct dcmi_buf *buf, *node;
 892
 893         dcmi_pipeline_stop(dcmi);
 894
 895         video_device_pipeline_stop(dcmi->vdev);
 896
 897         spin_lock_irq(&dcmi->irqlock);
 898
 899         /* Disable interruptions */
 900         reg_clear(dcmi->regs, DCMI_IER, IT_FRAME | IT_OVR | IT_ERR);
 901
 902         /* Disable DCMI */
 903         reg_clear(dcmi->regs, DCMI_CR, CR_ENABLE);
 904
 905         /* Return all queued buffers to vb2 in ERROR state */
 906         list_for_each_entry_safe(buf, node, &dcmi->buffers, list) {
 907                 list_del_init(&buf->list);
 908                 vb2_buffer_done(&buf->vb.vb2_buf, VB2_BUF_STATE_ERROR);
 909         }
 910
 911         dcmi->active = NULL;
 912         dcmi->state = STOPPED;
 913
 914         spin_unlock_irq(&dcmi->irqlock);
 915
 916         /* Stop all pending DMA operations */
 917         mutex_lock(&dcmi->dma_lock);
 918         dmaengine_terminate_sync(dcmi->dma_chan);
 919         mutex_unlock(&dcmi->dma_lock);
 920
 921         pm_runtime_put(dcmi->dev);
 922
 923         if (dcmi->errors_count)
 924                 dev_warn(dcmi->dev, "Some errors found while streaming: errors=%d (overrun=%d), buffers=%d\n",
 925                          dcmi->errors_count, dcmi->overrun_count,
 926                          dcmi->buffers_count);
 927         dev_dbg(dcmi->dev, "Stop streaming, errors=%d (overrun=%d), buffers=%d\n",
 928                 dcmi->errors_count, dcmi->overrun_count,
 929                 dcmi->buffers_count);
 930 }
 931
 932 static const struct vb2_ops dcmi_video_qops = {
 933         .queue_setup            = dcmi_queue_setup,
 934         .buf_init               = dcmi_buf_init,
 935         .buf_prepare            = dcmi_buf_prepare,
 936         .buf_queue              = dcmi_buf_queue,
 937         .start_streaming        = dcmi_start_streaming,
 938         .stop_streaming         = dcmi_stop_streaming,
 939         .wait_prepare           = vb2_ops_wait_prepare,
 940         .wait_finish            = vb2_ops_wait_finish,
 941 };
 942
 943 static int dcmi_g_fmt_vid_cap(struct file *file, void *priv,
 944                               struct v4l2_format *fmt)
 945 {
 946         struct stm32_dcmi *dcmi = video_drvdata(file);
 947
 948         *fmt = dcmi->fmt;
 949
 950         return 0;
 951 }
 952
 953 static const struct dcmi_format *find_format_by_fourcc(struct stm32_dcmi *dcmi,
 954                                                        unsigned int fourcc)
 955 {
 956         unsigned int num_formats = dcmi->num_of_sd_formats;
 957         const struct dcmi_format *fmt;
 958         unsigned int i;
 959
 960         for (i = 0; i < num_formats; i++) {
 961                 fmt = dcmi->sd_formats[i];
 962                 if (fmt->fourcc == fourcc)
 963                         return fmt;
 964         }
 965
 966         return NULL;
 967 }
 968
 969 static void __find_outer_frame_size(struct stm32_dcmi *dcmi,
 970                                     struct v4l2_pix_format *pix,
 971                                     struct dcmi_framesize *framesize)
 972 {
 973         struct dcmi_framesize *match = NULL;
 974         unsigned int i;
 975         unsigned int min_err = UINT_MAX;
 976
 977         for (i = 0; i < dcmi->num_of_sd_framesizes; i++) {
 978                 struct dcmi_framesize *fsize = &dcmi->sd_framesizes[i];
 979                 int w_err = (fsize->width - pix->width);
 980                 int h_err = (fsize->height - pix->height);
 981                 int err = w_err + h_err;
 982
 983                 if (w_err >= 0 && h_err >= 0 && err < min_err) {
 984                         min_err = err;
 985                         match = fsize;
 986                 }
 987         }
 988         if (!match)
 989                 match = &dcmi->sd_framesizes[0];
 990
 991         *framesize = *match;
 992 }
 993
 994 static int dcmi_try_fmt(struct stm32_dcmi *dcmi, struct v4l2_format *f,
 995                         const struct dcmi_format **sd_format,
 996                         struct dcmi_framesize *sd_framesize)
 997 {
 998         const struct dcmi_format *sd_fmt;
 999         struct dcmi_framesize sd_fsize;
1000         struct v4l2_pix_format *pix = &f->fmt.pix;
1001         struct v4l2_subdev_format format = {
1002                 .which = V4L2_SUBDEV_FORMAT_TRY,
1003         };
1004         bool do_crop;
1005         int ret;
1006
1007         sd_fmt = find_format_by_fourcc(dcmi, pix->pixelformat);
1008         if (!sd_fmt) {
1009                 if (!dcmi->num_of_sd_formats)
1010                         return -ENODATA;
1011
1012                 sd_fmt = dcmi->sd_formats[dcmi->num_of_sd_formats - 1];
1013                 pix->pixelformat = sd_fmt->fourcc;
1014         }
1015
1016         /* Limit to hardware capabilities */
1017         pix->width = clamp(pix->width, MIN_WIDTH, MAX_WIDTH);
1018         pix->height = clamp(pix->height, MIN_HEIGHT, MAX_HEIGHT);
1019
1020         /* No crop if JPEG is requested */
1021         do_crop = dcmi->do_crop && (pix->pixelformat != V4L2_PIX_FMT_JPEG);
1022
1023         if (do_crop && dcmi->num_of_sd_framesizes) {
1024                 struct dcmi_framesize outer_sd_fsize;
1025                 /*
1026                  * If crop is requested and sensor have discrete frame sizes,
1027                  * select the frame size that is just larger than request
1028                  */
1029                 __find_outer_frame_size(dcmi, pix, &outer_sd_fsize);
1030                 pix->width = outer_sd_fsize.width;
1031                 pix->height = outer_sd_fsize.height;
1032         }
1033
1034         v4l2_fill_mbus_format(&format.format, pix, sd_fmt->mbus_code);
1035         ret = v4l2_subdev_call_state_try(dcmi->source, pad, set_fmt, &format);
1036         if (ret < 0)
1037                 return ret;
1038
1039         /* Update pix regarding to what sensor can do */
1040         v4l2_fill_pix_format(pix, &format.format);
1041
1042         /* Save resolution that sensor can actually do */
1043         sd_fsize.width = pix->width;
1044         sd_fsize.height = pix->height;
1045
1046         if (do_crop) {
1047                 struct v4l2_rect c = dcmi->crop;
1048                 struct v4l2_rect max_rect;
1049
1050                 /*
1051                  * Adjust crop by making the intersection between
1052                  * format resolution request and crop request
1053                  */
1054                 max_rect.top = 0;
1055                 max_rect.left = 0;
1056                 max_rect.width = pix->width;
1057                 max_rect.height = pix->height;
1058                 v4l2_rect_map_inside(&c, &max_rect);
1059                 c.top  = clamp_t(s32, c.top, 0, pix->height - c.height);
1060                 c.left = clamp_t(s32, c.left, 0, pix->width - c.width);
1061                 dcmi->crop = c;
1062
1063                 /* Adjust format resolution request to crop */
1064                 pix->width = dcmi->crop.width;
1065                 pix->height = dcmi->crop.height;
1066         }
1067
1068         pix->field = V4L2_FIELD_NONE;
1069         pix->bytesperline = pix->width * sd_fmt->bpp;
1070         pix->sizeimage = pix->bytesperline * pix->height;
1071
1072         if (sd_format)
1073                 *sd_format = sd_fmt;
1074         if (sd_framesize)
1075                 *sd_framesize = sd_fsize;
1076
1077         return 0;
1078 }
1079
1080 static int dcmi_set_fmt(struct stm32_dcmi *dcmi, struct v4l2_format *f)
1081 {
1082         struct v4l2_subdev_format format = {
1083                 .which = V4L2_SUBDEV_FORMAT_ACTIVE,
1084         };
1085         const struct dcmi_format *sd_format;
1086         struct dcmi_framesize sd_framesize;
1087         struct v4l2_mbus_framefmt *mf = &format.format;
1088         struct v4l2_pix_format *pix = &f->fmt.pix;
1089         int ret;
1090
1091         /*
1092          * Try format, fmt.width/height could have been changed
1093          * to match sensor capability or crop request
1094          * sd_format & sd_framesize will contain what subdev
1095          * can do for this request.
1096          */
1097         ret = dcmi_try_fmt(dcmi, f, &sd_format, &sd_framesize);
1098         if (ret)
1099                 return ret;
1100
1101         /* Disable crop if JPEG is requested or BT656 bus is selected */
1102         if (pix->pixelformat == V4L2_PIX_FMT_JPEG &&
1103             dcmi->bus_type != V4L2_MBUS_BT656)
1104                 dcmi->do_crop = false;
1105
1106         /* pix to mbus format */
1107         v4l2_fill_mbus_format(mf, pix,
1108                               sd_format->mbus_code);
1109         mf->width = sd_framesize.width;
1110         mf->height = sd_framesize.height;
1111
1112         ret = dcmi_pipeline_s_fmt(dcmi, &format);
1113         if (ret < 0)
1114                 return ret;
1115
1116         dev_dbg(dcmi->dev, "Sensor format set to 0x%x %ux%u\n",
1117                 mf->code, mf->width, mf->height);
1118         dev_dbg(dcmi->dev, "Buffer format set to %4.4s %ux%u\n",
1119                 (char *)&pix->pixelformat,
1120                 pix->width, pix->height);
1121
1122         dcmi->fmt = *f;
1123         dcmi->sd_format = sd_format;
1124         dcmi->sd_framesize = sd_framesize;
1125
1126         return 0;
1127 }
1128
1129 static int dcmi_s_fmt_vid_cap(struct file *file, void *priv,
1130                               struct v4l2_format *f)
1131 {
1132         struct stm32_dcmi *dcmi = video_drvdata(file);
1133
1134         if (vb2_is_streaming(&dcmi->queue))
1135                 return -EBUSY;
1136
1137         return dcmi_set_fmt(dcmi, f);
1138 }
1139
1140 static int dcmi_try_fmt_vid_cap(struct file *file, void *priv,
1141                                 struct v4l2_format *f)
1142 {
1143         struct stm32_dcmi *dcmi = video_drvdata(file);
1144
1145         return dcmi_try_fmt(dcmi, f, NULL, NULL);
1146 }
1147
1148 static int dcmi_enum_fmt_vid_cap(struct file *file, void  *priv,
1149                                  struct v4l2_fmtdesc *f)
1150 {
1151         struct stm32_dcmi *dcmi = video_drvdata(file);
1152
1153         if (f->index >= dcmi->num_of_sd_formats)
1154                 return -EINVAL;
1155
1156         f->pixelformat = dcmi->sd_formats[f->index]->fourcc;
1157         return 0;
1158 }
1159
1160 static int dcmi_get_sensor_format(struct stm32_dcmi *dcmi,
1161                                   struct v4l2_pix_format *pix)
1162 {
1163         struct v4l2_subdev_format fmt = {
1164                 .which = V4L2_SUBDEV_FORMAT_ACTIVE,
1165         };
1166         int ret;
1167
1168         ret = v4l2_subdev_call(dcmi->source, pad, get_fmt, NULL, &fmt);
1169         if (ret)
1170                 return ret;
1171
1172         v4l2_fill_pix_format(pix, &fmt.format);
1173
1174         return 0;
1175 }
1176
1177 static int dcmi_set_sensor_format(struct stm32_dcmi *dcmi,
1178                                   struct v4l2_pix_format *pix)
1179 {
1180         const struct dcmi_format *sd_fmt;
1181         struct v4l2_subdev_format format = {
1182                 .which = V4L2_SUBDEV_FORMAT_TRY,
1183         };
1184         int ret;
1185
1186         sd_fmt = find_format_by_fourcc(dcmi, pix->pixelformat);
1187         if (!sd_fmt) {
1188                 if (!dcmi->num_of_sd_formats)
1189                         return -ENODATA;
1190
1191                 sd_fmt = dcmi->sd_formats[dcmi->num_of_sd_formats - 1];
1192                 pix->pixelformat = sd_fmt->fourcc;
1193         }
1194
1195         v4l2_fill_mbus_format(&format.format, pix, sd_fmt->mbus_code);
1196         ret = v4l2_subdev_call_state_try(dcmi->source, pad, set_fmt, &format);
1197         if (ret < 0)
1198                 return ret;
1199
1200         return 0;
1201 }
1202
1203 static int dcmi_get_sensor_bounds(struct stm32_dcmi *dcmi,
1204                                   struct v4l2_rect *r)
1205 {
1206         struct v4l2_subdev_selection bounds = {
1207                 .which = V4L2_SUBDEV_FORMAT_ACTIVE,
1208                 .target = V4L2_SEL_TGT_CROP_BOUNDS,
1209         };
1210         unsigned int max_width, max_height, max_pixsize;
1211         struct v4l2_pix_format pix;
1212         unsigned int i;
1213         int ret;
1214
1215         /*
1216          * Get sensor bounds first
1217          */
1218         ret = v4l2_subdev_call(dcmi->source, pad, get_selection,
1219                                NULL, &bounds);
1220         if (!ret)
1221                 *r = bounds.r;
1222         if (ret != -ENOIOCTLCMD)
1223                 return ret;
1224
1225         /*
1226          * If selection is not implemented,
1227          * fallback by enumerating sensor frame sizes
1228          * and take the largest one
1229          */
1230         max_width = 0;
1231         max_height = 0;
1232         max_pixsize = 0;
1233         for (i = 0; i < dcmi->num_of_sd_framesizes; i++) {
1234                 struct dcmi_framesize *fsize = &dcmi->sd_framesizes[i];
1235                 unsigned int pixsize = fsize->width * fsize->height;
1236
1237                 if (pixsize > max_pixsize) {
1238                         max_pixsize = pixsize;
1239                         max_width = fsize->width;
1240                         max_height = fsize->height;
1241                 }
1242         }
1243         if (max_pixsize > 0) {
1244                 r->top = 0;
1245                 r->left = 0;
1246                 r->width = max_width;
1247                 r->height = max_height;
1248                 return 0;
1249         }
1250
1251         /*
1252          * If frame sizes enumeration is not implemented,
1253          * fallback by getting current sensor frame size
1254          */
1255         ret = dcmi_get_sensor_format(dcmi, &pix);
1256         if (ret)
1257                 return ret;
1258
1259         r->top = 0;
1260         r->left = 0;
1261         r->width = pix.width;
1262         r->height = pix.height;
1263
1264         return 0;
1265 }
1266
1267 static int dcmi_g_selection(struct file *file, void *fh,
1268                             struct v4l2_selection *s)
1269 {
1270         struct stm32_dcmi *dcmi = video_drvdata(file);
1271
1272         if (s->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
1273                 return -EINVAL;
1274
1275         switch (s->target) {
1276         case V4L2_SEL_TGT_CROP_DEFAULT:
1277         case V4L2_SEL_TGT_CROP_BOUNDS:
1278                 s->r = dcmi->sd_bounds;
1279                 return 0;
1280         case V4L2_SEL_TGT_CROP:
1281                 if (dcmi->do_crop) {
1282                         s->r = dcmi->crop;
1283                 } else {
1284                         s->r.top = 0;
1285                         s->r.left = 0;
1286                         s->r.width = dcmi->fmt.fmt.pix.width;
1287                         s->r.height = dcmi->fmt.fmt.pix.height;
1288                 }
1289                 break;
1290         default:
1291                 return -EINVAL;
1292         }
1293
1294         return 0;
1295 }
1296
1297 static int dcmi_s_selection(struct file *file, void *priv,
1298                             struct v4l2_selection *s)
1299 {
1300         struct stm32_dcmi *dcmi = video_drvdata(file);
1301         struct v4l2_rect r = s->r;
1302         struct v4l2_rect max_rect;
1303         struct v4l2_pix_format pix;
1304
1305         if (s->type != V4L2_BUF_TYPE_VIDEO_CAPTURE ||
1306             s->target != V4L2_SEL_TGT_CROP)
1307                 return -EINVAL;
1308
1309         /* Reset sensor resolution to max resolution */
1310         pix.pixelformat = dcmi->fmt.fmt.pix.pixelformat;
1311         pix.width = dcmi->sd_bounds.width;
1312         pix.height = dcmi->sd_bounds.height;
1313         dcmi_set_sensor_format(dcmi, &pix);
1314
1315         /*
1316          * Make the intersection between
1317          * sensor resolution
1318          * and crop request
1319          */
1320         max_rect.top = 0;
1321         max_rect.left = 0;
1322         max_rect.width = pix.width;
1323         max_rect.height = pix.height;
1324         v4l2_rect_map_inside(&r, &max_rect);
1325         r.top  = clamp_t(s32, r.top, 0, pix.height - r.height);
1326         r.left = clamp_t(s32, r.left, 0, pix.width - r.width);
1327
1328         if (!(r.top == dcmi->sd_bounds.top &&
1329               r.left == dcmi->sd_bounds.left &&
1330               r.width == dcmi->sd_bounds.width &&
1331               r.height == dcmi->sd_bounds.height)) {
1332                 /* Crop if request is different than sensor resolution */
1333                 dcmi->do_crop = true;
1334                 dcmi->crop = r;
1335                 dev_dbg(dcmi->dev, "s_selection: crop %ux%u@(%u,%u) from %ux%u\n",
1336                         r.width, r.height, r.left, r.top,
1337                         pix.width, pix.height);
1338         } else {
1339                 /* Disable crop */
1340                 dcmi->do_crop = false;
1341                 dev_dbg(dcmi->dev, "s_selection: crop is disabled\n");
1342         }
1343
1344         s->r = r;
1345         return 0;
1346 }
1347
1348 static int dcmi_querycap(struct file *file, void *priv,
1349                          struct v4l2_capability *cap)
1350 {
1351         strscpy(cap->driver, DRV_NAME, sizeof(cap->driver));
1352         strscpy(cap->card, "STM32 Camera Memory Interface",
1353                 sizeof(cap->card));
1354         strscpy(cap->bus_info, "platform:dcmi", sizeof(cap->bus_info));
1355         return 0;
1356 }
1357
1358 static int dcmi_enum_input(struct file *file, void *priv,
1359                            struct v4l2_input *i)
1360 {
1361         if (i->index != 0)
1362                 return -EINVAL;
1363
1364         i->type = V4L2_INPUT_TYPE_CAMERA;
1365         strscpy(i->name, "Camera", sizeof(i->name));
1366         return 0;
1367 }
1368
1369 static int dcmi_g_input(struct file *file, void *priv, unsigned int *i)
1370 {
1371         *i = 0;
1372         return 0;
1373 }
1374
1375 static int dcmi_s_input(struct file *file, void *priv, unsigned int i)
1376 {
1377         if (i > 0)
1378                 return -EINVAL;
1379         return 0;
1380 }
1381
1382 static int dcmi_enum_framesizes(struct file *file, void *fh,
1383                                 struct v4l2_frmsizeenum *fsize)
1384 {
1385         struct stm32_dcmi *dcmi = video_drvdata(file);
1386         const struct dcmi_format *sd_fmt;
1387         struct v4l2_subdev_frame_size_enum fse = {
1388                 .index = fsize->index,
1389                 .which = V4L2_SUBDEV_FORMAT_ACTIVE,
1390         };
1391         int ret;
1392
1393         sd_fmt = find_format_by_fourcc(dcmi, fsize->pixel_format);
1394         if (!sd_fmt)
1395                 return -EINVAL;
1396
1397         fse.code = sd_fmt->mbus_code;
1398
1399         ret = v4l2_subdev_call(dcmi->source, pad, enum_frame_size,
1400                                NULL, &fse);
1401         if (ret)
1402                 return ret;
1403
1404         fsize->type = V4L2_FRMSIZE_TYPE_DISCRETE;
1405         fsize->discrete.width = fse.max_width;
1406         fsize->discrete.height = fse.max_height;
1407
1408         return 0;
1409 }
1410
1411 static int dcmi_g_parm(struct file *file, void *priv,
1412                        struct v4l2_streamparm *p)
1413 {
1414         struct stm32_dcmi *dcmi = video_drvdata(file);
1415
1416         return v4l2_g_parm_cap(video_devdata(file), dcmi->source, p);
1417 }
1418
1419 static int dcmi_s_parm(struct file *file, void *priv,
1420                        struct v4l2_streamparm *p)
1421 {
1422         struct stm32_dcmi *dcmi = video_drvdata(file);
1423
1424         return v4l2_s_parm_cap(video_devdata(file), dcmi->source, p);
1425 }
1426
1427 static int dcmi_enum_frameintervals(struct file *file, void *fh,
1428                                     struct v4l2_frmivalenum *fival)
1429 {
1430         struct stm32_dcmi *dcmi = video_drvdata(file);
1431         const struct dcmi_format *sd_fmt;
1432         struct v4l2_subdev_frame_interval_enum fie = {
1433                 .index = fival->index,
1434                 .width = fival->width,
1435                 .height = fival->height,
1436                 .which = V4L2_SUBDEV_FORMAT_ACTIVE,
1437         };
1438         int ret;
1439
1440         sd_fmt = find_format_by_fourcc(dcmi, fival->pixel_format);
1441         if (!sd_fmt)
1442                 return -EINVAL;
1443
1444         fie.code = sd_fmt->mbus_code;
1445
1446         ret = v4l2_subdev_call(dcmi->source, pad,
1447                                enum_frame_interval, NULL, &fie);
1448         if (ret)
1449                 return ret;
1450
1451         fival->type = V4L2_FRMIVAL_TYPE_DISCRETE;
1452         fival->discrete = fie.interval;
1453
1454         return 0;
1455 }
1456
1457 static const struct of_device_id stm32_dcmi_of_match[] = {
1458         { .compatible = "st,stm32-dcmi"},
1459         { /* end node */ },
1460 };
1461 MODULE_DEVICE_TABLE(of, stm32_dcmi_of_match);
1462
1463 static int dcmi_open(struct file *file)
1464 {
1465         struct stm32_dcmi *dcmi = video_drvdata(file);
1466         struct v4l2_subdev *sd = dcmi->source;
1467         int ret;
1468
1469         if (mutex_lock_interruptible(&dcmi->lock))
1470                 return -ERESTARTSYS;
1471
1472         ret = v4l2_fh_open(file);
1473         if (ret < 0)
1474                 goto unlock;
1475
1476         if (!v4l2_fh_is_singular_file(file))
1477                 goto fh_rel;
1478
1479         ret = v4l2_subdev_call(sd, core, s_power, 1);
1480         if (ret < 0 && ret != -ENOIOCTLCMD)
1481                 goto fh_rel;
1482
1483         ret = dcmi_set_fmt(dcmi, &dcmi->fmt);
1484         if (ret)
1485                 v4l2_subdev_call(sd, core, s_power, 0);
1486 fh_rel:
1487         if (ret)
1488                 v4l2_fh_release(file);
1489 unlock:
1490         mutex_unlock(&dcmi->lock);
1491         return ret;
1492 }
1493
1494 static int dcmi_release(struct file *file)
1495 {
1496         struct stm32_dcmi *dcmi = video_drvdata(file);
1497         struct v4l2_subdev *sd = dcmi->source;
1498         bool fh_singular;
1499         int ret;
1500
1501         mutex_lock(&dcmi->lock);
1502
1503         fh_singular = v4l2_fh_is_singular_file(file);
1504
1505         ret = _vb2_fop_release(file, NULL);
1506
1507         if (fh_singular)
1508                 v4l2_subdev_call(sd, core, s_power, 0);
1509
1510         mutex_unlock(&dcmi->lock);
1511
1512         return ret;
1513 }
1514
1515 static const struct v4l2_ioctl_ops dcmi_ioctl_ops = {
1516         .vidioc_querycap                = dcmi_querycap,
1517
1518         .vidioc_try_fmt_vid_cap         = dcmi_try_fmt_vid_cap,
1519         .vidioc_g_fmt_vid_cap           = dcmi_g_fmt_vid_cap,
1520         .vidioc_s_fmt_vid_cap           = dcmi_s_fmt_vid_cap,
1521         .vidioc_enum_fmt_vid_cap        = dcmi_enum_fmt_vid_cap,
1522         .vidioc_g_selection             = dcmi_g_selection,
1523         .vidioc_s_selection             = dcmi_s_selection,
1524
1525         .vidioc_enum_input              = dcmi_enum_input,
1526         .vidioc_g_input                 = dcmi_g_input,
1527         .vidioc_s_input                 = dcmi_s_input,
1528
1529         .vidioc_g_parm                  = dcmi_g_parm,
1530         .vidioc_s_parm                  = dcmi_s_parm,
1531
1532         .vidioc_enum_framesizes         = dcmi_enum_framesizes,
1533         .vidioc_enum_frameintervals     = dcmi_enum_frameintervals,
1534
1535         .vidioc_reqbufs                 = vb2_ioctl_reqbufs,
1536         .vidioc_create_bufs             = vb2_ioctl_create_bufs,
1537         .vidioc_querybuf                = vb2_ioctl_querybuf,
1538         .vidioc_qbuf                    = vb2_ioctl_qbuf,
1539         .vidioc_dqbuf                   = vb2_ioctl_dqbuf,
1540         .vidioc_expbuf                  = vb2_ioctl_expbuf,
1541         .vidioc_prepare_buf             = vb2_ioctl_prepare_buf,
1542         .vidioc_streamon                = vb2_ioctl_streamon,
1543         .vidioc_streamoff               = vb2_ioctl_streamoff,
1544
1545         .vidioc_log_status              = v4l2_ctrl_log_status,
1546         .vidioc_subscribe_event         = v4l2_ctrl_subscribe_event,
1547         .vidioc_unsubscribe_event       = v4l2_event_unsubscribe,
1548 };
1549
1550 static const struct v4l2_file_operations dcmi_fops = {
1551         .owner          = THIS_MODULE,
1552         .unlocked_ioctl = video_ioctl2,
1553         .open           = dcmi_open,
1554         .release        = dcmi_release,
1555         .poll           = vb2_fop_poll,
1556         .mmap           = vb2_fop_mmap,
1557 #ifndef CONFIG_MMU
1558         .get_unmapped_area = vb2_fop_get_unmapped_area,
1559 #endif
1560         .read           = vb2_fop_read,
1561 };
1562
1563 static int dcmi_set_default_fmt(struct stm32_dcmi *dcmi)
1564 {
1565         struct v4l2_format f = {
1566                 .type = V4L2_BUF_TYPE_VIDEO_CAPTURE,
1567                 .fmt.pix = {
1568                         .width          = CIF_WIDTH,
1569                         .height         = CIF_HEIGHT,
1570                         .field          = V4L2_FIELD_NONE,
1571                         .pixelformat    = dcmi->sd_formats[0]->fourcc,
1572                 },
1573         };
1574         int ret;
1575
1576         ret = dcmi_try_fmt(dcmi, &f, NULL, NULL);
1577         if (ret)
1578                 return ret;
1579         dcmi->sd_format = dcmi->sd_formats[0];
1580         dcmi->fmt = f;
1581         return 0;
1582 }
1583
1584 static const struct dcmi_format dcmi_formats[] = {
1585         {
1586                 .fourcc = V4L2_PIX_FMT_RGB565,
1587                 .mbus_code = MEDIA_BUS_FMT_RGB565_2X8_LE,
1588                 .bpp = 2,
1589         }, {
1590                 .fourcc = V4L2_PIX_FMT_RGB565,
1591                 .mbus_code = MEDIA_BUS_FMT_RGB565_1X16,
1592                 .bpp = 2,
1593         }, {
1594                 .fourcc = V4L2_PIX_FMT_YUYV,
1595                 .mbus_code = MEDIA_BUS_FMT_YUYV8_2X8,
1596                 .bpp = 2,
1597         }, {
1598                 .fourcc = V4L2_PIX_FMT_YUYV,
1599                 .mbus_code = MEDIA_BUS_FMT_YUYV8_1X16,
1600                 .bpp = 2,
1601         }, {
1602                 .fourcc = V4L2_PIX_FMT_UYVY,
1603                 .mbus_code = MEDIA_BUS_FMT_UYVY8_2X8,
1604                 .bpp = 2,
1605         }, {
1606                 .fourcc = V4L2_PIX_FMT_UYVY,
1607                 .mbus_code = MEDIA_BUS_FMT_UYVY8_1X16,
1608                 .bpp = 2,
1609         }, {
1610                 .fourcc = V4L2_PIX_FMT_JPEG,
1611                 .mbus_code = MEDIA_BUS_FMT_JPEG_1X8,
1612                 .bpp = 1,
1613         }, {
1614                 .fourcc = V4L2_PIX_FMT_SBGGR8,
1615                 .mbus_code = MEDIA_BUS_FMT_SBGGR8_1X8,
1616                 .bpp = 1,
1617         }, {
1618                 .fourcc = V4L2_PIX_FMT_SGBRG8,
1619                 .mbus_code = MEDIA_BUS_FMT_SGBRG8_1X8,
1620                 .bpp = 1,
1621         }, {
1622                 .fourcc = V4L2_PIX_FMT_SGRBG8,
1623                 .mbus_code = MEDIA_BUS_FMT_SGRBG8_1X8,
1624                 .bpp = 1,
1625         }, {
1626                 .fourcc = V4L2_PIX_FMT_SRGGB8,
1627                 .mbus_code = MEDIA_BUS_FMT_SRGGB8_1X8,
1628                 .bpp = 1,
1629         }, {
1630                 .fourcc = V4L2_PIX_FMT_SBGGR10,
1631                 .mbus_code = MEDIA_BUS_FMT_SBGGR10_1X10,
1632                 .bpp = 2,
1633         }, {
1634                 .fourcc = V4L2_PIX_FMT_SGBRG10,
1635                 .mbus_code = MEDIA_BUS_FMT_SGBRG10_1X10,
1636                 .bpp = 2,
1637         }, {
1638                 .fourcc = V4L2_PIX_FMT_SGRBG10,
1639                 .mbus_code = MEDIA_BUS_FMT_SGRBG10_1X10,
1640                 .bpp = 2,
1641         }, {
1642                 .fourcc = V4L2_PIX_FMT_SRGGB10,
1643                 .mbus_code = MEDIA_BUS_FMT_SRGGB10_1X10,
1644                 .bpp = 2,
1645         }, {
1646                 .fourcc = V4L2_PIX_FMT_SBGGR12,
1647                 .mbus_code = MEDIA_BUS_FMT_SBGGR12_1X12,
1648                 .bpp = 2,
1649         }, {
1650                 .fourcc = V4L2_PIX_FMT_SGBRG12,
1651                 .mbus_code = MEDIA_BUS_FMT_SGBRG12_1X12,
1652                 .bpp = 2,
1653         }, {
1654                 .fourcc = V4L2_PIX_FMT_SGRBG12,
1655                 .mbus_code = MEDIA_BUS_FMT_SGRBG12_1X12,
1656                 .bpp = 2,
1657         }, {
1658                 .fourcc = V4L2_PIX_FMT_SRGGB12,
1659                 .mbus_code = MEDIA_BUS_FMT_SRGGB12_1X12,
1660                 .bpp = 2,
1661         }, {
1662                 .fourcc = V4L2_PIX_FMT_SBGGR14,
1663                 .mbus_code = MEDIA_BUS_FMT_SBGGR14_1X14,
1664                 .bpp = 2,
1665         }, {
1666                 .fourcc = V4L2_PIX_FMT_SGBRG14,
1667                 .mbus_code = MEDIA_BUS_FMT_SGBRG14_1X14,
1668                 .bpp = 2,
1669         }, {
1670                 .fourcc = V4L2_PIX_FMT_SGRBG14,
1671                 .mbus_code = MEDIA_BUS_FMT_SGRBG14_1X14,
1672                 .bpp = 2,
1673         }, {
1674                 .fourcc = V4L2_PIX_FMT_SRGGB14,
1675                 .mbus_code = MEDIA_BUS_FMT_SRGGB14_1X14,
1676                 .bpp = 2,
1677         },
1678 };
1679
1680 static int dcmi_formats_init(struct stm32_dcmi *dcmi)
1681 {
1682         const struct dcmi_format *sd_fmts[ARRAY_SIZE(dcmi_formats)];
1683         unsigned int num_fmts = 0, i, j;
1684         struct v4l2_subdev *subdev = dcmi->source;
1685         struct v4l2_subdev_mbus_code_enum mbus_code = {
1686                 .which = V4L2_SUBDEV_FORMAT_ACTIVE,
1687         };
1688
1689         while (!v4l2_subdev_call(subdev, pad, enum_mbus_code,
1690                                  NULL, &mbus_code)) {
1691                 for (i = 0; i < ARRAY_SIZE(dcmi_formats); i++) {
1692                         if (dcmi_formats[i].mbus_code != mbus_code.code)
1693                                 continue;
1694
1695                         /* Exclude JPEG if BT656 bus is selected */
1696                         if (dcmi_formats[i].fourcc == V4L2_PIX_FMT_JPEG &&
1697                             dcmi->bus_type == V4L2_MBUS_BT656)
1698                                 continue;
1699
1700                         /* Code supported, have we got this fourcc yet? */
1701                         for (j = 0; j < num_fmts; j++)
1702                                 if (sd_fmts[j]->fourcc ==
1703                                                 dcmi_formats[i].fourcc) {
1704                                         /* Already available */
1705                                         dev_dbg(dcmi->dev, "Skipping fourcc/code: %4.4s/0x%x\n",
1706                                                 (char *)&sd_fmts[j]->fourcc,
1707                                                 mbus_code.code);
1708                                         break;
1709                                 }
1710                         if (j == num_fmts) {
1711                                 /* New */
1712                                 sd_fmts[num_fmts++] = dcmi_formats + i;
1713                                 dev_dbg(dcmi->dev, "Supported fourcc/code: %4.4s/0x%x\n",
1714                                         (char *)&sd_fmts[num_fmts - 1]->fourcc,
1715                                         sd_fmts[num_fmts - 1]->mbus_code);
1716                         }
1717                 }
1718                 mbus_code.index++;
1719         }
1720
1721         if (!num_fmts)
1722                 return -ENXIO;
1723
1724         dcmi->num_of_sd_formats = num_fmts;
1725         dcmi->sd_formats = devm_kcalloc(dcmi->dev,
1726                                         num_fmts, sizeof(struct dcmi_format *),
1727                                         GFP_KERNEL);
1728         if (!dcmi->sd_formats) {
1729                 dev_err(dcmi->dev, "Could not allocate memory\n");
1730                 return -ENOMEM;
1731         }
1732
1733         memcpy(dcmi->sd_formats, sd_fmts,
1734                num_fmts * sizeof(struct dcmi_format *));
1735         dcmi->sd_format = dcmi->sd_formats[0];
1736
1737         return 0;
1738 }
1739
1740 static int dcmi_framesizes_init(struct stm32_dcmi *dcmi)
1741 {
1742         unsigned int num_fsize = 0;
1743         struct v4l2_subdev *subdev = dcmi->source;
1744         struct v4l2_subdev_frame_size_enum fse = {
1745                 .which = V4L2_SUBDEV_FORMAT_ACTIVE,
1746                 .code = dcmi->sd_format->mbus_code,
1747         };
1748         unsigned int ret;
1749         unsigned int i;
1750
1751         /* Allocate discrete framesizes array */
1752         while (!v4l2_subdev_call(subdev, pad, enum_frame_size,
1753                                  NULL, &fse))
1754                 fse.index++;
1755
1756         num_fsize = fse.index;
1757         if (!num_fsize)
1758                 return 0;
1759
1760         dcmi->num_of_sd_framesizes = num_fsize;
1761         dcmi->sd_framesizes = devm_kcalloc(dcmi->dev, num_fsize,
1762                                            sizeof(struct dcmi_framesize),
1763                                            GFP_KERNEL);
1764         if (!dcmi->sd_framesizes) {
1765                 dev_err(dcmi->dev, "Could not allocate memory\n");
1766                 return -ENOMEM;
1767         }
1768
1769         /* Fill array with sensor supported framesizes */
1770         dev_dbg(dcmi->dev, "Sensor supports %u frame sizes:\n", num_fsize);
1771         for (i = 0; i < dcmi->num_of_sd_framesizes; i++) {
1772                 fse.index = i;
1773                 ret = v4l2_subdev_call(subdev, pad, enum_frame_size,
1774                                        NULL, &fse);
1775                 if (ret)
1776                         return ret;
1777                 dcmi->sd_framesizes[fse.index].width = fse.max_width;
1778                 dcmi->sd_framesizes[fse.index].height = fse.max_height;
1779                 dev_dbg(dcmi->dev, "%ux%u\n", fse.max_width, fse.max_height);
1780         }
1781
1782         return 0;
1783 }
1784
1785 static int dcmi_graph_notify_complete(struct v4l2_async_notifier *notifier)
1786 {
1787         struct stm32_dcmi *dcmi = notifier_to_dcmi(notifier);
1788         int ret;
1789
1790         /*
1791          * Now that the graph is complete,
1792          * we search for the source subdevice
1793          * in order to expose it through V4L2 interface
1794          */
1795         dcmi->source = media_entity_to_v4l2_subdev(dcmi_find_source(dcmi));
1796         if (!dcmi->source) {
1797                 dev_err(dcmi->dev, "Source subdevice not found\n");
1798                 return -ENODEV;
1799         }
1800
1801         dcmi->vdev->ctrl_handler = dcmi->source->ctrl_handler;
1802
1803         ret = dcmi_formats_init(dcmi);
1804         if (ret) {
1805                 dev_err(dcmi->dev, "No supported mediabus format found\n");
1806                 return ret;
1807         }
1808
1809         ret = dcmi_framesizes_init(dcmi);
1810         if (ret) {
1811                 dev_err(dcmi->dev, "Could not initialize framesizes\n");
1812                 return ret;
1813         }
1814
1815         ret = dcmi_get_sensor_bounds(dcmi, &dcmi->sd_bounds);
1816         if (ret) {
1817                 dev_err(dcmi->dev, "Could not get sensor bounds\n");
1818                 return ret;
1819         }
1820
1821         ret = dcmi_set_default_fmt(dcmi);
1822         if (ret) {
1823                 dev_err(dcmi->dev, "Could not set default format\n");
1824                 return ret;
1825         }
1826
1827         ret = devm_request_threaded_irq(dcmi->dev, dcmi->irq, dcmi_irq_callback,
1828                                         dcmi_irq_thread, IRQF_ONESHOT,
1829                                         dev_name(dcmi->dev), dcmi);
1830         if (ret) {
1831                 dev_err(dcmi->dev, "Unable to request irq %d\n", dcmi->irq);
1832                 return ret;
1833         }
1834
1835         return 0;
1836 }
1837
1838 static void dcmi_graph_notify_unbind(struct v4l2_async_notifier *notifier,
1839                                      struct v4l2_subdev *sd,
1840                                      struct v4l2_async_connection *asd)
1841 {
1842         struct stm32_dcmi *dcmi = notifier_to_dcmi(notifier);
1843
1844         dev_dbg(dcmi->dev, "Removing %s\n", video_device_node_name(dcmi->vdev));
1845
1846         /* Checks internally if vdev has been init or not */
1847         video_unregister_device(dcmi->vdev);
1848 }
1849
1850 static int dcmi_graph_notify_bound(struct v4l2_async_notifier *notifier,
1851                                    struct v4l2_subdev *subdev,
1852                                    struct v4l2_async_connection *asd)
1853 {
1854         struct stm32_dcmi *dcmi = notifier_to_dcmi(notifier);
1855         unsigned int ret;
1856         int src_pad;
1857
1858         dev_dbg(dcmi->dev, "Subdev \"%s\" bound\n", subdev->name);
1859
1860         /*
1861          * Link this sub-device to DCMI, it could be
1862          * a parallel camera sensor or a bridge
1863          */
1864         src_pad = media_entity_get_fwnode_pad(&subdev->entity,
1865                                               subdev->fwnode,
1866                                               MEDIA_PAD_FL_SOURCE);
1867
1868         ret = media_create_pad_link(&subdev->entity, src_pad,
1869                                     &dcmi->vdev->entity, 0,
1870                                     MEDIA_LNK_FL_IMMUTABLE |
1871                                     MEDIA_LNK_FL_ENABLED);
1872         if (ret)
1873                 dev_err(dcmi->dev, "Failed to create media pad link with subdev \"%s\"\n",
1874                         subdev->name);
1875         else
1876                 dev_dbg(dcmi->dev, "DCMI is now linked to \"%s\"\n",
1877                         subdev->name);
1878
1879         return ret;
1880 }
1881
1882 static const struct v4l2_async_notifier_operations dcmi_graph_notify_ops = {
1883         .bound = dcmi_graph_notify_bound,
1884         .unbind = dcmi_graph_notify_unbind,
1885         .complete = dcmi_graph_notify_complete,
1886 };
1887
1888 static int dcmi_graph_init(struct stm32_dcmi *dcmi)
1889 {
1890         struct v4l2_async_connection *asd;
1891         struct device_node *ep;
1892         int ret;
1893
1894         ep = of_graph_get_next_endpoint(dcmi->dev->of_node, NULL);
1895         if (!ep) {
1896                 dev_err(dcmi->dev, "Failed to get next endpoint\n");
1897                 return -EINVAL;
1898         }
1899
1900         v4l2_async_nf_init(&dcmi->notifier);
1901
1902         asd = v4l2_async_nf_add_fwnode_remote(&dcmi->notifier,
1903                                               of_fwnode_handle(ep),
1904                                               struct v4l2_async_connection);
1905
1906         of_node_put(ep);
1907
1908         if (IS_ERR(asd)) {
1909                 dev_err(dcmi->dev, "Failed to add subdev notifier\n");
1910                 return PTR_ERR(asd);
1911         }
1912
1913         dcmi->notifier.ops = &dcmi_graph_notify_ops;
1914
1915         ret = v4l2_async_nf_register(&dcmi->v4l2_dev, &dcmi->notifier);
1916         if (ret < 0) {
1917                 dev_err(dcmi->dev, "Failed to register notifier\n");
1918                 v4l2_async_nf_cleanup(&dcmi->notifier);
1919                 return ret;
1920         }
1921
1922         return 0;
1923 }
1924
1925 static int dcmi_probe(struct platform_device *pdev)
1926 {
1927         struct device_node *np = pdev->dev.of_node;
1928         const struct of_device_id *match = NULL;
1929         struct v4l2_fwnode_endpoint ep = { .bus_type = 0 };
1930         struct stm32_dcmi *dcmi;
1931         struct vb2_queue *q;
1932         struct dma_chan *chan;
1933         struct dma_slave_caps caps;
1934         struct clk *mclk;
1935         int ret = 0;
1936
1937         match = of_match_device(of_match_ptr(stm32_dcmi_of_match), &pdev->dev);
1938         if (!match) {
1939                 dev_err(&pdev->dev, "Could not find a match in devicetree\n");
1940                 return -ENODEV;
1941         }
1942
1943         dcmi = devm_kzalloc(&pdev->dev, sizeof(struct stm32_dcmi), GFP_KERNEL);
1944         if (!dcmi)
1945                 return -ENOMEM;
1946
1947         dcmi->rstc = devm_reset_control_get_exclusive(&pdev->dev, NULL);
1948         if (IS_ERR(dcmi->rstc))
1949                 return dev_err_probe(&pdev->dev, PTR_ERR(dcmi->rstc),
1950                                      "Could not get reset control\n");
1951
1952         /* Get bus characteristics from devicetree */
1953         np = of_graph_get_next_endpoint(np, NULL);
1954         if (!np) {
1955                 dev_err(&pdev->dev, "Could not find the endpoint\n");
1956                 return -ENODEV;
1957         }
1958
1959         ret = v4l2_fwnode_endpoint_parse(of_fwnode_handle(np), &ep);
1960         of_node_put(np);
1961         if (ret) {
1962                 dev_err(&pdev->dev, "Could not parse the endpoint\n");
1963                 return ret;
1964         }
1965
1966         if (ep.bus_type == V4L2_MBUS_CSI2_DPHY) {
1967                 dev_err(&pdev->dev, "CSI bus not supported\n");
1968                 return -ENODEV;
1969         }
1970
1971         if (ep.bus_type == V4L2_MBUS_BT656 &&
1972             ep.bus.parallel.bus_width != 8) {
1973                 dev_err(&pdev->dev, "BT656 bus conflicts with %u bits bus width (8 bits required)\n",
1974                         ep.bus.parallel.bus_width);
1975                 return -ENODEV;
1976         }
1977
1978         dcmi->bus.flags = ep.bus.parallel.flags;
1979         dcmi->bus.bus_width = ep.bus.parallel.bus_width;
1980         dcmi->bus.data_shift = ep.bus.parallel.data_shift;
1981         dcmi->bus_type = ep.bus_type;
1982
1983         dcmi->irq = platform_get_irq(pdev, 0);
1984         if (dcmi->irq < 0)
1985                 return dcmi->irq;
1986
1987         dcmi->regs = devm_platform_get_and_ioremap_resource(pdev, 0, &dcmi->res);
1988         if (IS_ERR(dcmi->regs))
1989                 return PTR_ERR(dcmi->regs);
1990
1991         mclk = devm_clk_get(&pdev->dev, "mclk");
1992         if (IS_ERR(mclk))
1993                 return dev_err_probe(&pdev->dev, PTR_ERR(mclk),
1994                                      "Unable to get mclk\n");
1995
1996         chan = dma_request_chan(&pdev->dev, "tx");
1997         if (IS_ERR(chan))
1998                 return dev_err_probe(&pdev->dev, PTR_ERR(chan),
1999                                      "Failed to request DMA channel\n");
2000
2001         dcmi->dma_max_burst = UINT_MAX;
2002         ret = dma_get_slave_caps(chan, &caps);
2003         if (!ret && caps.max_sg_burst)
2004                 dcmi->dma_max_burst = caps.max_sg_burst * DMA_SLAVE_BUSWIDTH_4_BYTES;
2005
2006         spin_lock_init(&dcmi->irqlock);
2007         mutex_init(&dcmi->lock);
2008         mutex_init(&dcmi->dma_lock);
2009         init_completion(&dcmi->complete);
2010         INIT_LIST_HEAD(&dcmi->buffers);
2011
2012         dcmi->dev = &pdev->dev;
2013         dcmi->mclk = mclk;
2014         dcmi->state = STOPPED;
2015         dcmi->dma_chan = chan;
2016
2017         q = &dcmi->queue;
2018
2019         dcmi->v4l2_dev.mdev = &dcmi->mdev;
2020
2021         /* Initialize media device */
2022         strscpy(dcmi->mdev.model, DRV_NAME, sizeof(dcmi->mdev.model));
2023         dcmi->mdev.dev = &pdev->dev;
2024         media_device_init(&dcmi->mdev);
2025
2026         /* Initialize the top-level structure */
2027         ret = v4l2_device_register(&pdev->dev, &dcmi->v4l2_dev);
2028         if (ret)
2029                 goto err_media_device_cleanup;
2030
2031         dcmi->vdev = video_device_alloc();
2032         if (!dcmi->vdev) {
2033                 ret = -ENOMEM;
2034                 goto err_device_unregister;
2035         }
2036
2037         /* Video node */
2038         dcmi->vdev->fops = &dcmi_fops;
2039         dcmi->vdev->v4l2_dev = &dcmi->v4l2_dev;
2040         dcmi->vdev->queue = &dcmi->queue;
2041         strscpy(dcmi->vdev->name, KBUILD_MODNAME, sizeof(dcmi->vdev->name));
2042         dcmi->vdev->release = video_device_release;
2043         dcmi->vdev->ioctl_ops = &dcmi_ioctl_ops;
2044         dcmi->vdev->lock = &dcmi->lock;
2045         dcmi->vdev->device_caps = V4L2_CAP_VIDEO_CAPTURE | V4L2_CAP_STREAMING |
2046                                   V4L2_CAP_READWRITE;
2047         video_set_drvdata(dcmi->vdev, dcmi);
2048
2049         /* Media entity pads */
2050         dcmi->vid_cap_pad.flags = MEDIA_PAD_FL_SINK;
2051         ret = media_entity_pads_init(&dcmi->vdev->entity,
2052                                      1, &dcmi->vid_cap_pad);
2053         if (ret) {
2054                 dev_err(dcmi->dev, "Failed to init media entity pad\n");
2055                 goto err_device_release;
2056         }
2057         dcmi->vdev->entity.flags |= MEDIA_ENT_FL_DEFAULT;
2058
2059         ret = video_register_device(dcmi->vdev, VFL_TYPE_VIDEO, -1);
2060         if (ret) {
2061                 dev_err(dcmi->dev, "Failed to register video device\n");
2062                 goto err_media_entity_cleanup;
2063         }
2064
2065         dev_dbg(dcmi->dev, "Device registered as %s\n",
2066                 video_device_node_name(dcmi->vdev));
2067
2068         /* Buffer queue */
2069         q->type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
2070         q->io_modes = VB2_MMAP | VB2_READ | VB2_DMABUF;
2071         q->lock = &dcmi->lock;
2072         q->drv_priv = dcmi;
2073         q->buf_struct_size = sizeof(struct dcmi_buf);
2074         q->ops = &dcmi_video_qops;
2075         q->mem_ops = &vb2_dma_contig_memops;
2076         q->timestamp_flags = V4L2_BUF_FLAG_TIMESTAMP_MONOTONIC;
2077         q->min_buffers_needed = 2;
2078         q->allow_cache_hints = 1;
2079         q->dev = &pdev->dev;
2080
2081         ret = vb2_queue_init(q);
2082         if (ret < 0) {
2083                 dev_err(&pdev->dev, "Failed to initialize vb2 queue\n");
2084                 goto err_media_entity_cleanup;
2085         }
2086
2087         ret = dcmi_graph_init(dcmi);
2088         if (ret < 0)
2089                 goto err_media_entity_cleanup;
2090
2091         /* Reset device */
2092         ret = reset_control_assert(dcmi->rstc);
2093         if (ret) {
2094                 dev_err(&pdev->dev, "Failed to assert the reset line\n");
2095                 goto err_cleanup;
2096         }
2097
2098         usleep_range(3000, 5000);
2099
2100         ret = reset_control_deassert(dcmi->rstc);
2101         if (ret) {
2102                 dev_err(&pdev->dev, "Failed to deassert the reset line\n");
2103                 goto err_cleanup;
2104         }
2105
2106         dev_info(&pdev->dev, "Probe done\n");
2107
2108         platform_set_drvdata(pdev, dcmi);
2109
2110         pm_runtime_enable(&pdev->dev);
2111
2112         return 0;
2113
2114 err_cleanup:
2115         v4l2_async_nf_cleanup(&dcmi->notifier);
2116 err_media_entity_cleanup:
2117         media_entity_cleanup(&dcmi->vdev->entity);
2118 err_device_release:
2119         video_device_release(dcmi->vdev);
2120 err_device_unregister:
2121         v4l2_device_unregister(&dcmi->v4l2_dev);
2122 err_media_device_cleanup:
2123         media_device_cleanup(&dcmi->mdev);
2124         dma_release_channel(dcmi->dma_chan);
2125
2126         return ret;
2127 }
2128
2129 static void dcmi_remove(struct platform_device *pdev)
2130 {
2131         struct stm32_dcmi *dcmi = platform_get_drvdata(pdev);
2132
2133         pm_runtime_disable(&pdev->dev);
2134
2135         v4l2_async_nf_unregister(&dcmi->notifier);
2136         v4l2_async_nf_cleanup(&dcmi->notifier);
2137         media_entity_cleanup(&dcmi->vdev->entity);
2138         v4l2_device_unregister(&dcmi->v4l2_dev);
2139         media_device_cleanup(&dcmi->mdev);
2140
2141         dma_release_channel(dcmi->dma_chan);
2142 }
2143
2144 static __maybe_unused int dcmi_runtime_suspend(struct device *dev)
2145 {
2146         struct stm32_dcmi *dcmi = dev_get_drvdata(dev);
2147
2148         clk_disable_unprepare(dcmi->mclk);
2149
2150         return 0;
2151 }
2152
2153 static __maybe_unused int dcmi_runtime_resume(struct device *dev)
2154 {
2155         struct stm32_dcmi *dcmi = dev_get_drvdata(dev);
2156         int ret;
2157
2158         ret = clk_prepare_enable(dcmi->mclk);
2159         if (ret)
2160                 dev_err(dev, "%s: Failed to prepare_enable clock\n", __func__);
2161
2162         return ret;
2163 }
2164
2165 static __maybe_unused int dcmi_suspend(struct device *dev)
2166 {
2167         /* disable clock */
2168         pm_runtime_force_suspend(dev);
2169
2170         /* change pinctrl state */
2171         pinctrl_pm_select_sleep_state(dev);
2172
2173         return 0;
2174 }
2175
2176 static __maybe_unused int dcmi_resume(struct device *dev)
2177 {
2178         /* restore pinctl default state */
2179         pinctrl_pm_select_default_state(dev);
2180
2181         /* clock enable */
2182         pm_runtime_force_resume(dev);
2183
2184         return 0;
2185 }
2186
2187 static const struct dev_pm_ops dcmi_pm_ops = {
2188         SET_SYSTEM_SLEEP_PM_OPS(dcmi_suspend, dcmi_resume)
2189         SET_RUNTIME_PM_OPS(dcmi_runtime_suspend,
2190                            dcmi_runtime_resume, NULL)
2191 };
2192
2193 static struct platform_driver stm32_dcmi_driver = {
2194         .probe          = dcmi_probe,
2195         .remove_new     = dcmi_remove,
2196         .driver         = {
2197                 .name = DRV_NAME,
2198                 .of_match_table = of_match_ptr(stm32_dcmi_of_match),
2199                 .pm = &dcmi_pm_ops,
2200         },
2201 };
2202
2203 module_platform_driver(stm32_dcmi_driver);
2204
2205 MODULE_AUTHOR("Yannick Fertre <yannick.fertre@st.com>");
2206 MODULE_AUTHOR("Hugues Fruchet <hugues.fruchet@st.com>");
2207 MODULE_DESCRIPTION("STMicroelectronics STM32 Digital Camera Memory Interface driver");
2208 MODULE_LICENSE("GPL");