drivers/staging/media/imx/imx-media-csi.c

   1 /*
   2  * V4L2 Capture CSI Subdev for Freescale i.MX5/6 SOC
   3  *
   4  * Copyright (c) 2014-2017 Mentor Graphics Inc.
   5  * Copyright (C) 2017 Pengutronix, Philipp Zabel <kernel@pengutronix.de>
   6  *
   7  * This program is free software; you can redistribute it and/or modify
   8  * it under the terms of the GNU General Public License as published by
   9  * the Free Software Foundation; either version 2 of the License, or
  10  * (at your option) any later version.
  11  */
  12 #include <linux/delay.h>
  13 #include <linux/gcd.h>
  14 #include <linux/interrupt.h>
  15 #include <linux/module.h>
  16 #include <linux/of_graph.h>
  17 #include <linux/pinctrl/consumer.h>
  18 #include <linux/platform_device.h>
  19 #include <media/v4l2-ctrls.h>
  20 #include <media/v4l2-device.h>
  21 #include <media/v4l2-event.h>
  22 #include <media/v4l2-fwnode.h>
  23 #include <media/v4l2-mc.h>
  24 #include <media/v4l2-subdev.h>
  25 #include <media/videobuf2-dma-contig.h>
  26 #include <video/imx-ipu-v3.h>
  27 #include <media/imx.h>
  28 #include "imx-media.h"
  29
  30 /*
  31  * Min/Max supported width and heights.
  32  *
  33  * We allow planar output, so we have to align width by 16 pixels
  34  * to meet IDMAC alignment requirements.
  35  *
  36  * TODO: move this into pad format negotiation, if capture device
  37  * has not requested planar formats, we should allow 8 pixel
  38  * alignment.
  39  */
  40 #define MIN_W       176
  41 #define MIN_H       144
  42 #define MAX_W      4096
  43 #define MAX_H      4096
  44 #define W_ALIGN    1 /* multiple of 2 pixels */
  45 #define H_ALIGN    1 /* multiple of 2 lines */
  46 #define S_ALIGN    1 /* multiple of 2 */
  47
  48 /*
  49  * struct csi_skip_desc - CSI frame skipping descriptor
  50  * @keep - number of frames kept per max_ratio frames
  51  * @max_ratio - width of skip_smfc, written to MAX_RATIO bitfield
  52  * @skip_smfc - skip pattern written to the SKIP_SMFC bitfield
  53  */
  54 struct csi_skip_desc {
  55         u8 keep;
  56         u8 max_ratio;
  57         u8 skip_smfc;
  58 };
  59
  60 struct csi_priv {
  61         struct device *dev;
  62         struct ipu_soc *ipu;
  63         struct imx_media_dev *md;
  64         struct v4l2_subdev sd;
  65         struct media_pad pad[CSI_NUM_PADS];
  66         /* the video device at IDMAC output pad */
  67         struct imx_media_video_dev *vdev;
  68         struct imx_media_fim *fim;
  69         int csi_id;
  70         int smfc_id;
  71
  72         /* lock to protect all members below */
  73         struct mutex lock;
  74
  75         int active_output_pad;
  76
  77         struct ipuv3_channel *idmac_ch;
  78         struct ipu_smfc *smfc;
  79         struct ipu_csi *csi;
  80
  81         struct v4l2_mbus_framefmt format_mbus[CSI_NUM_PADS];
  82         const struct imx_media_pixfmt *cc[CSI_NUM_PADS];
  83         struct v4l2_fract frame_interval[CSI_NUM_PADS];
  84         struct v4l2_rect crop;
  85         struct v4l2_rect compose;
  86         const struct csi_skip_desc *skip;
  87
  88         /* active vb2 buffers to send to video dev sink */
  89         struct imx_media_buffer *active_vb2_buf[2];
  90         struct imx_media_dma_buf underrun_buf;
  91
  92         int ipu_buf_num;  /* ipu double buffer index: 0-1 */
  93
  94         /* the sink for the captured frames */
  95         struct media_entity *sink;
  96         enum ipu_csi_dest dest;
  97         /* the source subdev */
  98         struct v4l2_subdev *src_sd;
  99
 100         /* the mipi virtual channel number at link validate */
 101         int vc_num;
 102
 103         /* the upstream endpoint CSI is receiving from */
 104         struct v4l2_fwnode_endpoint upstream_ep;
 105
 106         spinlock_t irqlock; /* protect eof_irq handler */
 107         struct timer_list eof_timeout_timer;
 108         int eof_irq;
 109         int nfb4eof_irq;
 110
 111         struct v4l2_ctrl_handler ctrl_hdlr;
 112
 113         int stream_count; /* streaming counter */
 114         u32 frame_sequence; /* frame sequence counter */
 115         bool last_eof;   /* waiting for last EOF at stream off */
 116         bool nfb4eof;    /* NFB4EOF encountered during streaming */
 117         bool interweave_swap; /* swap top/bottom lines when interweaving */
 118         struct completion last_eof_comp;
 119 };
 120
 121 static inline struct csi_priv *sd_to_dev(struct v4l2_subdev *sdev)
 122 {
 123         return container_of(sdev, struct csi_priv, sd);
 124 }
 125
 126 static inline bool is_parallel_bus(struct v4l2_fwnode_endpoint *ep)
 127 {
 128         return ep->bus_type != V4L2_MBUS_CSI2_DPHY;
 129 }
 130
 131 static inline bool is_parallel_16bit_bus(struct v4l2_fwnode_endpoint *ep)
 132 {
 133         return is_parallel_bus(ep) && ep->bus.parallel.bus_width >= 16;
 134 }
 135
 136 /*
 137  * Check for conditions that require the IPU to handle the
 138  * data internally as generic data, aka passthrough mode:
 139  * - raw bayer media bus formats, or
 140  * - the CSI is receiving from a 16-bit parallel bus, or
 141  * - the CSI is receiving from an 8-bit parallel bus and the incoming
 142  *   media bus format is other than UYVY8_2X8/YUYV8_2X8.
 143  */
 144 static inline bool requires_passthrough(struct v4l2_fwnode_endpoint *ep,
 145                                         struct v4l2_mbus_framefmt *infmt,
 146                                         const struct imx_media_pixfmt *incc)
 147 {
 148         return incc->bayer || is_parallel_16bit_bus(ep) ||
 149                 (is_parallel_bus(ep) &&
 150                  infmt->code != MEDIA_BUS_FMT_UYVY8_2X8 &&
 151                  infmt->code != MEDIA_BUS_FMT_YUYV8_2X8);
 152 }
 153
 154 /*
 155  * Parses the fwnode endpoint from the source pad of the entity
 156  * connected to this CSI. This will either be the entity directly
 157  * upstream from the CSI-2 receiver, or directly upstream from the
 158  * video mux. The endpoint is needed to determine the bus type and
 159  * bus config coming into the CSI.
 160  */
 161 static int csi_get_upstream_endpoint(struct csi_priv *priv,
 162                                      struct v4l2_fwnode_endpoint *ep)
 163 {
 164         struct device_node *endpoint, *port;
 165         struct media_entity *src;
 166         struct v4l2_subdev *sd;
 167         struct media_pad *pad;
 168
 169         if (!IS_ENABLED(CONFIG_OF))
 170                 return -ENXIO;
 171
 172         if (!priv->src_sd)
 173                 return -EPIPE;
 174
 175         src = &priv->src_sd->entity;
 176
 177         if (src->function == MEDIA_ENT_F_VID_MUX) {
 178                 /*
 179                  * CSI is connected directly to video mux, skip up to
 180                  * CSI-2 receiver if it is in the path, otherwise stay
 181                  * with video mux.
 182                  */
 183                 sd = imx_media_find_upstream_subdev(priv->md, src,
 184                                                     IMX_MEDIA_GRP_ID_CSI2);
 185                 if (!IS_ERR(sd))
 186                         src = &sd->entity;
 187         }
 188
 189         /* get source pad of entity directly upstream from src */
 190         pad = imx_media_find_upstream_pad(priv->md, src, 0);
 191         if (IS_ERR(pad))
 192                 return PTR_ERR(pad);
 193
 194         sd = media_entity_to_v4l2_subdev(pad->entity);
 195
 196         /*
 197          * NOTE: this assumes an OF-graph port id is the same as a
 198          * media pad index.
 199          */
 200         port = of_graph_get_port_by_id(sd->dev->of_node, pad->index);
 201         if (!port)
 202                 return -ENODEV;
 203
 204         endpoint = of_get_next_child(port, NULL);
 205         of_node_put(port);
 206         if (!endpoint)
 207                 return -ENODEV;
 208
 209         v4l2_fwnode_endpoint_parse(of_fwnode_handle(endpoint), ep);
 210         of_node_put(endpoint);
 211
 212         return 0;
 213 }
 214
 215 static void csi_idmac_put_ipu_resources(struct csi_priv *priv)
 216 {
 217         if (priv->idmac_ch)
 218                 ipu_idmac_put(priv->idmac_ch);
 219         priv->idmac_ch = NULL;
 220
 221         if (priv->smfc)
 222                 ipu_smfc_put(priv->smfc);
 223         priv->smfc = NULL;
 224 }
 225
 226 static int csi_idmac_get_ipu_resources(struct csi_priv *priv)
 227 {
 228         int ch_num, ret;
 229         struct ipu_smfc *smfc;
 230         struct ipuv3_channel *idmac_ch;
 231
 232         ch_num = IPUV3_CHANNEL_CSI0 + priv->smfc_id;
 233
 234         smfc = ipu_smfc_get(priv->ipu, ch_num);
 235         if (IS_ERR(smfc)) {
 236                 v4l2_err(&priv->sd, "failed to get SMFC\n");
 237                 ret = PTR_ERR(smfc);
 238                 goto out;
 239         }
 240         priv->smfc = smfc;
 241
 242         idmac_ch = ipu_idmac_get(priv->ipu, ch_num);
 243         if (IS_ERR(idmac_ch)) {
 244                 v4l2_err(&priv->sd, "could not get IDMAC channel %u\n",
 245                          ch_num);
 246                 ret = PTR_ERR(idmac_ch);
 247                 goto out;
 248         }
 249         priv->idmac_ch = idmac_ch;
 250
 251         return 0;
 252 out:
 253         csi_idmac_put_ipu_resources(priv);
 254         return ret;
 255 }
 256
 257 static void csi_vb2_buf_done(struct csi_priv *priv)
 258 {
 259         struct imx_media_video_dev *vdev = priv->vdev;
 260         struct imx_media_buffer *done, *next;
 261         struct vb2_buffer *vb;
 262         dma_addr_t phys;
 263
 264         done = priv->active_vb2_buf[priv->ipu_buf_num];
 265         if (done) {
 266                 done->vbuf.field = vdev->fmt.fmt.pix.field;
 267                 done->vbuf.sequence = priv->frame_sequence;
 268                 vb = &done->vbuf.vb2_buf;
 269                 vb->timestamp = ktime_get_ns();
 270                 vb2_buffer_done(vb, priv->nfb4eof ?
 271                                 VB2_BUF_STATE_ERROR : VB2_BUF_STATE_DONE);
 272         }
 273
 274         priv->frame_sequence++;
 275         priv->nfb4eof = false;
 276
 277         /* get next queued buffer */
 278         next = imx_media_capture_device_next_buf(vdev);
 279         if (next) {
 280                 phys = vb2_dma_contig_plane_dma_addr(&next->vbuf.vb2_buf, 0);
 281                 priv->active_vb2_buf[priv->ipu_buf_num] = next;
 282         } else {
 283                 phys = priv->underrun_buf.phys;
 284                 priv->active_vb2_buf[priv->ipu_buf_num] = NULL;
 285         }
 286
 287         if (ipu_idmac_buffer_is_ready(priv->idmac_ch, priv->ipu_buf_num))
 288                 ipu_idmac_clear_buffer(priv->idmac_ch, priv->ipu_buf_num);
 289
 290         if (priv->interweave_swap)
 291                 phys += vdev->fmt.fmt.pix.bytesperline;
 292
 293         ipu_cpmem_set_buffer(priv->idmac_ch, priv->ipu_buf_num, phys);
 294 }
 295
 296 static irqreturn_t csi_idmac_eof_interrupt(int irq, void *dev_id)
 297 {
 298         struct csi_priv *priv = dev_id;
 299
 300         spin_lock(&priv->irqlock);
 301
 302         if (priv->last_eof) {
 303                 complete(&priv->last_eof_comp);
 304                 priv->last_eof = false;
 305                 goto unlock;
 306         }
 307
 308         if (priv->fim)
 309                 /* call frame interval monitor */
 310                 imx_media_fim_eof_monitor(priv->fim, ktime_get());
 311
 312         csi_vb2_buf_done(priv);
 313
 314         /* select new IPU buf */
 315         ipu_idmac_select_buffer(priv->idmac_ch, priv->ipu_buf_num);
 316         /* toggle IPU double-buffer index */
 317         priv->ipu_buf_num ^= 1;
 318
 319         /* bump the EOF timeout timer */
 320         mod_timer(&priv->eof_timeout_timer,
 321                   jiffies + msecs_to_jiffies(IMX_MEDIA_EOF_TIMEOUT));
 322
 323 unlock:
 324         spin_unlock(&priv->irqlock);
 325         return IRQ_HANDLED;
 326 }
 327
 328 static irqreturn_t csi_idmac_nfb4eof_interrupt(int irq, void *dev_id)
 329 {
 330         struct csi_priv *priv = dev_id;
 331
 332         spin_lock(&priv->irqlock);
 333
 334         /*
 335          * this is not an unrecoverable error, just mark
 336          * the next captured frame with vb2 error flag.
 337          */
 338         priv->nfb4eof = true;
 339
 340         v4l2_err(&priv->sd, "NFB4EOF\n");
 341
 342         spin_unlock(&priv->irqlock);
 343
 344         return IRQ_HANDLED;
 345 }
 346
 347 /*
 348  * EOF timeout timer function. This is an unrecoverable condition
 349  * without a stream restart.
 350  */
 351 static void csi_idmac_eof_timeout(struct timer_list *t)
 352 {
 353         struct csi_priv *priv = from_timer(priv, t, eof_timeout_timer);
 354         struct imx_media_video_dev *vdev = priv->vdev;
 355
 356         v4l2_err(&priv->sd, "EOF timeout\n");
 357
 358         /* signal a fatal error to capture device */
 359         imx_media_capture_device_error(vdev);
 360 }
 361
 362 static void csi_idmac_setup_vb2_buf(struct csi_priv *priv, dma_addr_t *phys)
 363 {
 364         struct imx_media_video_dev *vdev = priv->vdev;
 365         struct imx_media_buffer *buf;
 366         int i;
 367
 368         for (i = 0; i < 2; i++) {
 369                 buf = imx_media_capture_device_next_buf(vdev);
 370                 if (buf) {
 371                         priv->active_vb2_buf[i] = buf;
 372                         phys[i] = vb2_dma_contig_plane_dma_addr(
 373                                 &buf->vbuf.vb2_buf, 0);
 374                 } else {
 375                         priv->active_vb2_buf[i] = NULL;
 376                         phys[i] = priv->underrun_buf.phys;
 377                 }
 378         }
 379 }
 380
 381 static void csi_idmac_unsetup_vb2_buf(struct csi_priv *priv,
 382                                       enum vb2_buffer_state return_status)
 383 {
 384         struct imx_media_buffer *buf;
 385         int i;
 386
 387         /* return any remaining active frames with return_status */
 388         for (i = 0; i < 2; i++) {
 389                 buf = priv->active_vb2_buf[i];
 390                 if (buf) {
 391                         struct vb2_buffer *vb = &buf->vbuf.vb2_buf;
 392
 393                         vb->timestamp = ktime_get_ns();
 394                         vb2_buffer_done(vb, return_status);
 395                 }
 396         }
 397 }
 398
 399 /* init the SMFC IDMAC channel */
 400 static int csi_idmac_setup_channel(struct csi_priv *priv)
 401 {
 402         struct imx_media_video_dev *vdev = priv->vdev;
 403         const struct imx_media_pixfmt *incc;
 404         struct v4l2_mbus_framefmt *infmt;
 405         struct v4l2_mbus_framefmt *outfmt;
 406         bool passthrough, interweave;
 407         struct ipu_image image;
 408         u32 passthrough_bits;
 409         u32 passthrough_cycles;
 410         dma_addr_t phys[2];
 411         u32 burst_size;
 412         int ret;
 413
 414         infmt = &priv->format_mbus[CSI_SINK_PAD];
 415         incc = priv->cc[CSI_SINK_PAD];
 416         outfmt = &priv->format_mbus[CSI_SRC_PAD_IDMAC];
 417
 418         ipu_cpmem_zero(priv->idmac_ch);
 419
 420         memset(&image, 0, sizeof(image));
 421         image.pix = vdev->fmt.fmt.pix;
 422         image.rect = vdev->compose;
 423
 424         csi_idmac_setup_vb2_buf(priv, phys);
 425
 426         image.phys0 = phys[0];
 427         image.phys1 = phys[1];
 428
 429         passthrough = requires_passthrough(&priv->upstream_ep, infmt, incc);
 430         passthrough_cycles = 1;
 431
 432         /*
 433          * If the field type at capture interface is interlaced, and
 434          * the output IDMAC pad is sequential, enable interweave at
 435          * the IDMAC output channel.
 436          */
 437         interweave = V4L2_FIELD_IS_INTERLACED(image.pix.field) &&
 438                 V4L2_FIELD_IS_SEQUENTIAL(outfmt->field);
 439         priv->interweave_swap = interweave &&
 440                 image.pix.field == V4L2_FIELD_INTERLACED_BT;
 441
 442         switch (image.pix.pixelformat) {
 443         case V4L2_PIX_FMT_SBGGR8:
 444         case V4L2_PIX_FMT_SGBRG8:
 445         case V4L2_PIX_FMT_SGRBG8:
 446         case V4L2_PIX_FMT_SRGGB8:
 447         case V4L2_PIX_FMT_GREY:
 448                 burst_size = 16;
 449                 passthrough_bits = 8;
 450                 break;
 451         case V4L2_PIX_FMT_SBGGR16:
 452         case V4L2_PIX_FMT_SGBRG16:
 453         case V4L2_PIX_FMT_SGRBG16:
 454         case V4L2_PIX_FMT_SRGGB16:
 455         case V4L2_PIX_FMT_Y16:
 456                 burst_size = 8;
 457                 passthrough_bits = 16;
 458                 break;
 459         case V4L2_PIX_FMT_YUV420:
 460         case V4L2_PIX_FMT_YVU420:
 461         case V4L2_PIX_FMT_NV12:
 462                 burst_size = (image.pix.width & 0x3f) ?
 463                              ((image.pix.width & 0x1f) ?
 464                               ((image.pix.width & 0xf) ? 8 : 16) : 32) : 64;
 465                 passthrough_bits = 16;
 466                 /*
 467                  * Skip writing U and V components to odd rows (but not
 468                  * when enabling IDMAC interweaving, they are incompatible).
 469                  */
 470                 if (!interweave)
 471                         ipu_cpmem_skip_odd_chroma_rows(priv->idmac_ch);
 472                 break;
 473         case V4L2_PIX_FMT_YUYV:
 474         case V4L2_PIX_FMT_UYVY:
 475                 burst_size = (image.pix.width & 0x1f) ?
 476                              ((image.pix.width & 0xf) ? 8 : 16) : 32;
 477                 passthrough_bits = 16;
 478                 break;
 479         case V4L2_PIX_FMT_RGB565:
 480                 if (passthrough) {
 481                         burst_size = 16;
 482                         passthrough_bits = 8;
 483                         passthrough_cycles = incc->cycles;
 484                         break;
 485                 }
 486                 /* fallthrough - non-passthrough RGB565 (CSI-2 bus) */
 487         default:
 488                 burst_size = (image.pix.width & 0xf) ? 8 : 16;
 489                 passthrough_bits = 16;
 490                 break;
 491         }
 492
 493         if (passthrough) {
 494                 if (priv->interweave_swap) {
 495                         /* start interweave scan at 1st top line (2nd line) */
 496                         image.phys0 += image.pix.bytesperline;
 497                         image.phys1 += image.pix.bytesperline;
 498                 }
 499
 500                 ipu_cpmem_set_resolution(priv->idmac_ch,
 501                                          image.rect.width * passthrough_cycles,
 502                                          image.rect.height);
 503                 ipu_cpmem_set_stride(priv->idmac_ch, image.pix.bytesperline);
 504                 ipu_cpmem_set_buffer(priv->idmac_ch, 0, image.phys0);
 505                 ipu_cpmem_set_buffer(priv->idmac_ch, 1, image.phys1);
 506                 ipu_cpmem_set_format_passthrough(priv->idmac_ch,
 507                                                  passthrough_bits);
 508         } else {
 509                 if (priv->interweave_swap) {
 510                         /* start interweave scan at 1st top line (2nd line) */
 511                         image.rect.top = 1;
 512                 }
 513
 514                 ret = ipu_cpmem_set_image(priv->idmac_ch, &image);
 515                 if (ret)
 516                         goto unsetup_vb2;
 517         }
 518
 519         ipu_cpmem_set_burstsize(priv->idmac_ch, burst_size);
 520
 521         /*
 522          * Set the channel for the direct CSI-->memory via SMFC
 523          * use-case to very high priority, by enabling the watermark
 524          * signal in the SMFC, enabling WM in the channel, and setting
 525          * the channel priority to high.
 526          *
 527          * Refer to the i.mx6 rev. D TRM Table 36-8: Calculated priority
 528          * value.
 529          *
 530          * The WM's are set very low by intention here to ensure that
 531          * the SMFC FIFOs do not overflow.
 532          */
 533         ipu_smfc_set_watermark(priv->smfc, 0x02, 0x01);
 534         ipu_cpmem_set_high_priority(priv->idmac_ch);
 535         ipu_idmac_enable_watermark(priv->idmac_ch, true);
 536         ipu_cpmem_set_axi_id(priv->idmac_ch, 0);
 537
 538         burst_size = passthrough ?
 539                 (burst_size >> 3) - 1 : (burst_size >> 2) - 1;
 540
 541         ipu_smfc_set_burstsize(priv->smfc, burst_size);
 542
 543         if (interweave)
 544                 ipu_cpmem_interlaced_scan(priv->idmac_ch,
 545                                           priv->interweave_swap ?
 546                                           -image.pix.bytesperline :
 547                                           image.pix.bytesperline,
 548                                           image.pix.pixelformat);
 549
 550         ipu_idmac_set_double_buffer(priv->idmac_ch, true);
 551
 552         return 0;
 553
 554 unsetup_vb2:
 555         csi_idmac_unsetup_vb2_buf(priv, VB2_BUF_STATE_QUEUED);
 556         return ret;
 557 }
 558
 559 static void csi_idmac_unsetup(struct csi_priv *priv,
 560                               enum vb2_buffer_state state)
 561 {
 562         ipu_idmac_disable_channel(priv->idmac_ch);
 563         ipu_smfc_disable(priv->smfc);
 564
 565         csi_idmac_unsetup_vb2_buf(priv, state);
 566 }
 567
 568 static int csi_idmac_setup(struct csi_priv *priv)
 569 {
 570         int ret;
 571
 572         ret = csi_idmac_setup_channel(priv);
 573         if (ret)
 574                 return ret;
 575
 576         ipu_cpmem_dump(priv->idmac_ch);
 577         ipu_dump(priv->ipu);
 578
 579         ipu_smfc_enable(priv->smfc);
 580
 581         /* set buffers ready */
 582         ipu_idmac_select_buffer(priv->idmac_ch, 0);
 583         ipu_idmac_select_buffer(priv->idmac_ch, 1);
 584
 585         /* enable the channels */
 586         ipu_idmac_enable_channel(priv->idmac_ch);
 587
 588         return 0;
 589 }
 590
 591 static int csi_idmac_start(struct csi_priv *priv)
 592 {
 593         struct imx_media_video_dev *vdev = priv->vdev;
 594         struct v4l2_pix_format *outfmt;
 595         int ret;
 596
 597         ret = csi_idmac_get_ipu_resources(priv);
 598         if (ret)
 599                 return ret;
 600
 601         ipu_smfc_map_channel(priv->smfc, priv->csi_id, priv->vc_num);
 602
 603         outfmt = &vdev->fmt.fmt.pix;
 604
 605         ret = imx_media_alloc_dma_buf(priv->md, &priv->underrun_buf,
 606                                       outfmt->sizeimage);
 607         if (ret)
 608                 goto out_put_ipu;
 609
 610         priv->ipu_buf_num = 0;
 611
 612         /* init EOF completion waitq */
 613         init_completion(&priv->last_eof_comp);
 614         priv->frame_sequence = 0;
 615         priv->last_eof = false;
 616         priv->nfb4eof = false;
 617
 618         ret = csi_idmac_setup(priv);
 619         if (ret) {
 620                 v4l2_err(&priv->sd, "csi_idmac_setup failed: %d\n", ret);
 621                 goto out_free_dma_buf;
 622         }
 623
 624         priv->nfb4eof_irq = ipu_idmac_channel_irq(priv->ipu,
 625                                                  priv->idmac_ch,
 626                                                  IPU_IRQ_NFB4EOF);
 627         ret = devm_request_irq(priv->dev, priv->nfb4eof_irq,
 628                                csi_idmac_nfb4eof_interrupt, 0,
 629                                "imx-smfc-nfb4eof", priv);
 630         if (ret) {
 631                 v4l2_err(&priv->sd,
 632                          "Error registering NFB4EOF irq: %d\n", ret);
 633                 goto out_unsetup;
 634         }
 635
 636         priv->eof_irq = ipu_idmac_channel_irq(priv->ipu, priv->idmac_ch,
 637                                               IPU_IRQ_EOF);
 638
 639         ret = devm_request_irq(priv->dev, priv->eof_irq,
 640                                csi_idmac_eof_interrupt, 0,
 641                                "imx-smfc-eof", priv);
 642         if (ret) {
 643                 v4l2_err(&priv->sd,
 644                          "Error registering eof irq: %d\n", ret);
 645                 goto out_free_nfb4eof_irq;
 646         }
 647
 648         /* start the EOF timeout timer */
 649         mod_timer(&priv->eof_timeout_timer,
 650                   jiffies + msecs_to_jiffies(IMX_MEDIA_EOF_TIMEOUT));
 651
 652         return 0;
 653
 654 out_free_nfb4eof_irq:
 655         devm_free_irq(priv->dev, priv->nfb4eof_irq, priv);
 656 out_unsetup:
 657         csi_idmac_unsetup(priv, VB2_BUF_STATE_QUEUED);
 658 out_free_dma_buf:
 659         imx_media_free_dma_buf(priv->md, &priv->underrun_buf);
 660 out_put_ipu:
 661         csi_idmac_put_ipu_resources(priv);
 662         return ret;
 663 }
 664
 665 static void csi_idmac_wait_last_eof(struct csi_priv *priv)
 666 {
 667         unsigned long flags;
 668         int ret;
 669
 670         /* mark next EOF interrupt as the last before stream off */
 671         spin_lock_irqsave(&priv->irqlock, flags);
 672         priv->last_eof = true;
 673         spin_unlock_irqrestore(&priv->irqlock, flags);
 674
 675         /*
 676          * and then wait for interrupt handler to mark completion.
 677          */
 678         ret = wait_for_completion_timeout(
 679                 &priv->last_eof_comp, msecs_to_jiffies(IMX_MEDIA_EOF_TIMEOUT));
 680         if (ret == 0)
 681                 v4l2_warn(&priv->sd, "wait last EOF timeout\n");
 682 }
 683
 684 static void csi_idmac_stop(struct csi_priv *priv)
 685 {
 686         devm_free_irq(priv->dev, priv->eof_irq, priv);
 687         devm_free_irq(priv->dev, priv->nfb4eof_irq, priv);
 688
 689         csi_idmac_unsetup(priv, VB2_BUF_STATE_ERROR);
 690
 691         imx_media_free_dma_buf(priv->md, &priv->underrun_buf);
 692
 693         /* cancel the EOF timeout timer */
 694         del_timer_sync(&priv->eof_timeout_timer);
 695
 696         csi_idmac_put_ipu_resources(priv);
 697 }
 698
 699 /* Update the CSI whole sensor and active windows */
 700 static int csi_setup(struct csi_priv *priv)
 701 {
 702         struct v4l2_mbus_framefmt *infmt, *outfmt;
 703         const struct imx_media_pixfmt *incc;
 704         struct v4l2_mbus_config mbus_cfg;
 705         struct v4l2_mbus_framefmt if_fmt;
 706         struct v4l2_rect crop;
 707
 708         infmt = &priv->format_mbus[CSI_SINK_PAD];
 709         incc = priv->cc[CSI_SINK_PAD];
 710         outfmt = &priv->format_mbus[priv->active_output_pad];
 711
 712         /* compose mbus_config from the upstream endpoint */
 713         mbus_cfg.type = priv->upstream_ep.bus_type;
 714         mbus_cfg.flags = is_parallel_bus(&priv->upstream_ep) ?
 715                 priv->upstream_ep.bus.parallel.flags :
 716                 priv->upstream_ep.bus.mipi_csi2.flags;
 717
 718         if_fmt = *infmt;
 719         crop = priv->crop;
 720
 721         /*
 722          * if cycles is set, we need to handle this over multiple cycles as
 723          * generic/bayer data
 724          */
 725         if (is_parallel_bus(&priv->upstream_ep) && incc->cycles) {
 726                 if_fmt.width *= incc->cycles;
 727                 crop.width *= incc->cycles;
 728         }
 729
 730         ipu_csi_set_window(priv->csi, &crop);
 731
 732         ipu_csi_set_downsize(priv->csi,
 733                              priv->crop.width == 2 * priv->compose.width,
 734                              priv->crop.height == 2 * priv->compose.height);
 735
 736         ipu_csi_init_interface(priv->csi, &mbus_cfg, &if_fmt, outfmt);
 737
 738         ipu_csi_set_dest(priv->csi, priv->dest);
 739
 740         if (priv->dest == IPU_CSI_DEST_IDMAC)
 741                 ipu_csi_set_skip_smfc(priv->csi, priv->skip->skip_smfc,
 742                                       priv->skip->max_ratio - 1, 0);
 743
 744         ipu_csi_dump(priv->csi);
 745
 746         return 0;
 747 }
 748
 749 static int csi_start(struct csi_priv *priv)
 750 {
 751         struct v4l2_fract *output_fi;
 752         int ret;
 753
 754         output_fi = &priv->frame_interval[priv->active_output_pad];
 755
 756         /* start upstream */
 757         ret = v4l2_subdev_call(priv->src_sd, video, s_stream, 1);
 758         ret = (ret && ret != -ENOIOCTLCMD) ? ret : 0;
 759         if (ret)
 760                 return ret;
 761
 762         if (priv->dest == IPU_CSI_DEST_IDMAC) {
 763                 ret = csi_idmac_start(priv);
 764                 if (ret)
 765                         goto stop_upstream;
 766         }
 767
 768         ret = csi_setup(priv);
 769         if (ret)
 770                 goto idmac_stop;
 771
 772         /* start the frame interval monitor */
 773         if (priv->fim && priv->dest == IPU_CSI_DEST_IDMAC) {
 774                 ret = imx_media_fim_set_stream(priv->fim, output_fi, true);
 775                 if (ret)
 776                         goto idmac_stop;
 777         }
 778
 779         ret = ipu_csi_enable(priv->csi);
 780         if (ret) {
 781                 v4l2_err(&priv->sd, "CSI enable error: %d\n", ret);
 782                 goto fim_off;
 783         }
 784
 785         return 0;
 786
 787 fim_off:
 788         if (priv->fim && priv->dest == IPU_CSI_DEST_IDMAC)
 789                 imx_media_fim_set_stream(priv->fim, NULL, false);
 790 idmac_stop:
 791         if (priv->dest == IPU_CSI_DEST_IDMAC)
 792                 csi_idmac_stop(priv);
 793 stop_upstream:
 794         v4l2_subdev_call(priv->src_sd, video, s_stream, 0);
 795         return ret;
 796 }
 797
 798 static void csi_stop(struct csi_priv *priv)
 799 {
 800         if (priv->dest == IPU_CSI_DEST_IDMAC)
 801                 csi_idmac_wait_last_eof(priv);
 802
 803         /*
 804          * Disable the CSI asap, after syncing with the last EOF.
 805          * Doing so after the IDMA channel is disabled has shown to
 806          * create hard system-wide hangs.
 807          */
 808         ipu_csi_disable(priv->csi);
 809
 810         /* stop upstream */
 811         v4l2_subdev_call(priv->src_sd, video, s_stream, 0);
 812
 813         if (priv->dest == IPU_CSI_DEST_IDMAC) {
 814                 csi_idmac_stop(priv);
 815
 816                 /* stop the frame interval monitor */
 817                 if (priv->fim)
 818                         imx_media_fim_set_stream(priv->fim, NULL, false);
 819         }
 820 }
 821
 822 static const struct csi_skip_desc csi_skip[12] = {
 823         { 1, 1, 0x00 }, /* Keep all frames */
 824         { 5, 6, 0x10 }, /* Skip every sixth frame */
 825         { 4, 5, 0x08 }, /* Skip every fifth frame */
 826         { 3, 4, 0x04 }, /* Skip every fourth frame */
 827         { 2, 3, 0x02 }, /* Skip every third frame */
 828         { 3, 5, 0x0a }, /* Skip frames 1 and 3 of every 5 */
 829         { 1, 2, 0x01 }, /* Skip every second frame */
 830         { 2, 5, 0x0b }, /* Keep frames 1 and 4 of every 5 */
 831         { 1, 3, 0x03 }, /* Keep one in three frames */
 832         { 1, 4, 0x07 }, /* Keep one in four frames */
 833         { 1, 5, 0x0f }, /* Keep one in five frames */
 834         { 1, 6, 0x1f }, /* Keep one in six frames */
 835 };
 836
 837 static void csi_apply_skip_interval(const struct csi_skip_desc *skip,
 838                                     struct v4l2_fract *interval)
 839 {
 840         unsigned int div;
 841
 842         interval->numerator *= skip->max_ratio;
 843         interval->denominator *= skip->keep;
 844
 845         /* Reduce fraction to lowest terms */
 846         div = gcd(interval->numerator, interval->denominator);
 847         if (div > 1) {
 848                 interval->numerator /= div;
 849                 interval->denominator /= div;
 850         }
 851 }
 852
 853 /*
 854  * Find the skip pattern to produce the output frame interval closest to the
 855  * requested one, for the given input frame interval. Updates the output frame
 856  * interval to the exact value.
 857  */
 858 static const struct csi_skip_desc *csi_find_best_skip(struct v4l2_fract *in,
 859                                                       struct v4l2_fract *out)
 860 {
 861         const struct csi_skip_desc *skip = &csi_skip[0], *best_skip = skip;
 862         u32 min_err = UINT_MAX;
 863         u64 want_us;
 864         int i;
 865
 866         /* Default to 1:1 ratio */
 867         if (out->numerator == 0 || out->denominator == 0 ||
 868             in->numerator == 0 || in->denominator == 0) {
 869                 *out = *in;
 870                 return best_skip;
 871         }
 872
 873         want_us = div_u64((u64)USEC_PER_SEC * out->numerator, out->denominator);
 874
 875         /* Find the reduction closest to the requested time per frame */
 876         for (i = 0; i < ARRAY_SIZE(csi_skip); i++, skip++) {
 877                 u64 tmp, err;
 878
 879                 tmp = div_u64((u64)USEC_PER_SEC * in->numerator *
 880                               skip->max_ratio, in->denominator * skip->keep);
 881
 882                 err = abs((s64)tmp - want_us);
 883                 if (err < min_err) {
 884                         min_err = err;
 885                         best_skip = skip;
 886                 }
 887         }
 888
 889         *out = *in;
 890         csi_apply_skip_interval(best_skip, out);
 891
 892         return best_skip;
 893 }
 894
 895 /*
 896  * V4L2 subdev operations.
 897  */
 898
 899 static int csi_g_frame_interval(struct v4l2_subdev *sd,
 900                                 struct v4l2_subdev_frame_interval *fi)
 901 {
 902         struct csi_priv *priv = v4l2_get_subdevdata(sd);
 903
 904         if (fi->pad >= CSI_NUM_PADS)
 905                 return -EINVAL;
 906
 907         mutex_lock(&priv->lock);
 908
 909         fi->interval = priv->frame_interval[fi->pad];
 910
 911         mutex_unlock(&priv->lock);
 912
 913         return 0;
 914 }
 915
 916 static int csi_s_frame_interval(struct v4l2_subdev *sd,
 917                                 struct v4l2_subdev_frame_interval *fi)
 918 {
 919         struct csi_priv *priv = v4l2_get_subdevdata(sd);
 920         struct v4l2_fract *input_fi;
 921         int ret = 0;
 922
 923         mutex_lock(&priv->lock);
 924
 925         input_fi = &priv->frame_interval[CSI_SINK_PAD];
 926
 927         switch (fi->pad) {
 928         case CSI_SINK_PAD:
 929                 /* No limits on input frame interval */
 930                 /* Reset output intervals and frame skipping ratio to 1:1 */
 931                 priv->frame_interval[CSI_SRC_PAD_IDMAC] = fi->interval;
 932                 priv->frame_interval[CSI_SRC_PAD_DIRECT] = fi->interval;
 933                 priv->skip = &csi_skip[0];
 934                 break;
 935         case CSI_SRC_PAD_IDMAC:
 936                 /*
 937                  * frame interval at IDMAC output pad depends on input
 938                  * interval, modified by frame skipping.
 939                  */
 940                 priv->skip = csi_find_best_skip(input_fi, &fi->interval);
 941                 break;
 942         case CSI_SRC_PAD_DIRECT:
 943                 /*
 944                  * frame interval at DIRECT output pad is same as input
 945                  * interval.
 946                  */
 947                 fi->interval = *input_fi;
 948                 break;
 949         default:
 950                 ret = -EINVAL;
 951                 goto out;
 952         }
 953
 954         priv->frame_interval[fi->pad] = fi->interval;
 955 out:
 956         mutex_unlock(&priv->lock);
 957         return ret;
 958 }
 959
 960 static int csi_s_stream(struct v4l2_subdev *sd, int enable)
 961 {
 962         struct csi_priv *priv = v4l2_get_subdevdata(sd);
 963         int ret = 0;
 964
 965         mutex_lock(&priv->lock);
 966
 967         if (!priv->src_sd || !priv->sink) {
 968                 ret = -EPIPE;
 969                 goto out;
 970         }
 971
 972         /*
 973          * enable/disable streaming only if stream_count is
 974          * going from 0 to 1 / 1 to 0.
 975          */
 976         if (priv->stream_count != !enable)
 977                 goto update_count;
 978
 979         if (enable) {
 980                 dev_dbg(priv->dev, "stream ON\n");
 981                 ret = csi_start(priv);
 982                 if (ret)
 983                         goto out;
 984         } else {
 985                 dev_dbg(priv->dev, "stream OFF\n");
 986                 csi_stop(priv);
 987         }
 988
 989 update_count:
 990         priv->stream_count += enable ? 1 : -1;
 991         if (priv->stream_count < 0)
 992                 priv->stream_count = 0;
 993 out:
 994         mutex_unlock(&priv->lock);
 995         return ret;
 996 }
 997
 998 static int csi_link_setup(struct media_entity *entity,
 999                           const struct media_pad *local,
1000                           const struct media_pad *remote, u32 flags)
1001 {
1002         struct v4l2_subdev *sd = media_entity_to_v4l2_subdev(entity);
1003         struct csi_priv *priv = v4l2_get_subdevdata(sd);
1004         struct v4l2_subdev *remote_sd;
1005         int ret = 0;
1006
1007         dev_dbg(priv->dev, "link setup %s -> %s\n", remote->entity->name,
1008                 local->entity->name);
1009
1010         mutex_lock(&priv->lock);
1011
1012         if (local->flags & MEDIA_PAD_FL_SINK) {
1013                 if (!is_media_entity_v4l2_subdev(remote->entity)) {
1014                         ret = -EINVAL;
1015                         goto out;
1016                 }
1017
1018                 remote_sd = media_entity_to_v4l2_subdev(remote->entity);
1019
1020                 if (flags & MEDIA_LNK_FL_ENABLED) {
1021                         if (priv->src_sd) {
1022                                 ret = -EBUSY;
1023                                 goto out;
1024                         }
1025                         priv->src_sd = remote_sd;
1026                 } else {
1027                         priv->src_sd = NULL;
1028                 }
1029
1030                 goto out;
1031         }
1032
1033         /* this is a source pad */
1034
1035         if (flags & MEDIA_LNK_FL_ENABLED) {
1036                 if (priv->sink) {
1037                         ret = -EBUSY;
1038                         goto out;
1039                 }
1040         } else {
1041                 v4l2_ctrl_handler_free(&priv->ctrl_hdlr);
1042                 v4l2_ctrl_handler_init(&priv->ctrl_hdlr, 0);
1043                 priv->sink = NULL;
1044                 /* do not apply IC burst alignment in csi_try_crop */
1045                 priv->active_output_pad = CSI_SRC_PAD_IDMAC;
1046                 goto out;
1047         }
1048
1049         /* record which output pad is now active */
1050         priv->active_output_pad = local->index;
1051
1052         /* set CSI destination */
1053         if (local->index == CSI_SRC_PAD_IDMAC) {
1054                 if (!is_media_entity_v4l2_video_device(remote->entity)) {
1055                         ret = -EINVAL;
1056                         goto out;
1057                 }
1058
1059                 if (priv->fim) {
1060                         ret = imx_media_fim_add_controls(priv->fim);
1061                         if (ret)
1062                                 goto out;
1063                 }
1064
1065                 priv->dest = IPU_CSI_DEST_IDMAC;
1066         } else {
1067                 if (!is_media_entity_v4l2_subdev(remote->entity)) {
1068                         ret = -EINVAL;
1069                         goto out;
1070                 }
1071
1072                 remote_sd = media_entity_to_v4l2_subdev(remote->entity);
1073                 switch (remote_sd->grp_id) {
1074                 case IMX_MEDIA_GRP_ID_VDIC:
1075                         priv->dest = IPU_CSI_DEST_VDIC;
1076                         break;
1077                 case IMX_MEDIA_GRP_ID_IC_PRP:
1078                         priv->dest = IPU_CSI_DEST_IC;
1079                         break;
1080                 default:
1081                         ret = -EINVAL;
1082                         goto out;
1083                 }
1084         }
1085
1086         priv->sink = remote->entity;
1087 out:
1088         mutex_unlock(&priv->lock);
1089         return ret;
1090 }
1091
1092 static int csi_link_validate(struct v4l2_subdev *sd,
1093                              struct media_link *link,
1094                              struct v4l2_subdev_format *source_fmt,
1095                              struct v4l2_subdev_format *sink_fmt)
1096 {
1097         struct csi_priv *priv = v4l2_get_subdevdata(sd);
1098         struct v4l2_fwnode_endpoint upstream_ep = { .bus_type = 0 };
1099         bool is_csi2;
1100         int ret;
1101
1102         ret = v4l2_subdev_link_validate_default(sd, link,
1103                                                 source_fmt, sink_fmt);
1104         if (ret)
1105                 return ret;
1106
1107         ret = csi_get_upstream_endpoint(priv, &upstream_ep);
1108         if (ret) {
1109                 v4l2_err(&priv->sd, "failed to find upstream endpoint\n");
1110                 return ret;
1111         }
1112
1113         mutex_lock(&priv->lock);
1114
1115         priv->upstream_ep = upstream_ep;
1116         is_csi2 = !is_parallel_bus(&upstream_ep);
1117         if (is_csi2) {
1118                 int vc_num = 0;
1119                 /*
1120                  * NOTE! It seems the virtual channels from the mipi csi-2
1121                  * receiver are used only for routing by the video mux's,
1122                  * or for hard-wired routing to the CSI's. Once the stream
1123                  * enters the CSI's however, they are treated internally
1124                  * in the IPU as virtual channel 0.
1125                  */
1126 #if 0
1127                 mutex_unlock(&priv->lock);
1128                 vc_num = imx_media_find_mipi_csi2_channel(priv->md,
1129                                                           &priv->sd.entity);
1130                 if (vc_num < 0)
1131                         return vc_num;
1132                 mutex_lock(&priv->lock);
1133 #endif
1134                 ipu_csi_set_mipi_datatype(priv->csi, vc_num,
1135                                           &priv->format_mbus[CSI_SINK_PAD]);
1136         }
1137
1138         /* select either parallel or MIPI-CSI2 as input to CSI */
1139         ipu_set_csi_src_mux(priv->ipu, priv->csi_id, is_csi2);
1140
1141         mutex_unlock(&priv->lock);
1142         return ret;
1143 }
1144
1145 static struct v4l2_mbus_framefmt *
1146 __csi_get_fmt(struct csi_priv *priv, struct v4l2_subdev_pad_config *cfg,
1147               unsigned int pad, enum v4l2_subdev_format_whence which)
1148 {
1149         if (which == V4L2_SUBDEV_FORMAT_TRY)
1150                 return v4l2_subdev_get_try_format(&priv->sd, cfg, pad);
1151         else
1152                 return &priv->format_mbus[pad];
1153 }
1154
1155 static struct v4l2_rect *
1156 __csi_get_crop(struct csi_priv *priv, struct v4l2_subdev_pad_config *cfg,
1157                enum v4l2_subdev_format_whence which)
1158 {
1159         if (which == V4L2_SUBDEV_FORMAT_TRY)
1160                 return v4l2_subdev_get_try_crop(&priv->sd, cfg, CSI_SINK_PAD);
1161         else
1162                 return &priv->crop;
1163 }
1164
1165 static struct v4l2_rect *
1166 __csi_get_compose(struct csi_priv *priv, struct v4l2_subdev_pad_config *cfg,
1167                   enum v4l2_subdev_format_whence which)
1168 {
1169         if (which == V4L2_SUBDEV_FORMAT_TRY)
1170                 return v4l2_subdev_get_try_compose(&priv->sd, cfg,
1171                                                    CSI_SINK_PAD);
1172         else
1173                 return &priv->compose;
1174 }
1175
1176 static void csi_try_crop(struct csi_priv *priv,
1177                          struct v4l2_rect *crop,
1178                          struct v4l2_subdev_pad_config *cfg,
1179                          struct v4l2_mbus_framefmt *infmt,
1180                          struct v4l2_fwnode_endpoint *upstream_ep)
1181 {
1182         u32 in_height;
1183
1184         crop->width = min_t(__u32, infmt->width, crop->width);
1185         if (crop->left + crop->width > infmt->width)
1186                 crop->left = infmt->width - crop->width;
1187         /* adjust crop left/width to h/w alignment restrictions */
1188         crop->left &= ~0x3;
1189         if (priv->active_output_pad == CSI_SRC_PAD_DIRECT)
1190                 crop->width &= ~0x7; /* multiple of 8 pixels (IC burst) */
1191         else
1192                 crop->width &= ~0x1; /* multiple of 2 pixels */
1193
1194         in_height = infmt->height;
1195         if (infmt->field == V4L2_FIELD_ALTERNATE)
1196                 in_height *= 2;
1197
1198         /*
1199          * FIXME: not sure why yet, but on interlaced bt.656,
1200          * changing the vertical cropping causes loss of vertical
1201          * sync, so fix it to NTSC/PAL active lines. NTSC contains
1202          * 2 extra lines of active video that need to be cropped.
1203          */
1204         if (upstream_ep->bus_type == V4L2_MBUS_BT656 &&
1205             (V4L2_FIELD_HAS_BOTH(infmt->field) ||
1206              infmt->field == V4L2_FIELD_ALTERNATE)) {
1207                 crop->height = in_height;
1208                 crop->top = (in_height == 480) ? 2 : 0;
1209         } else {
1210                 crop->height = min_t(__u32, in_height, crop->height);
1211                 if (crop->top + crop->height > in_height)
1212                         crop->top = in_height - crop->height;
1213         }
1214 }
1215
1216 static int csi_enum_mbus_code(struct v4l2_subdev *sd,
1217                               struct v4l2_subdev_pad_config *cfg,
1218                               struct v4l2_subdev_mbus_code_enum *code)
1219 {
1220         struct csi_priv *priv = v4l2_get_subdevdata(sd);
1221         struct v4l2_fwnode_endpoint upstream_ep = { .bus_type = 0 };
1222         const struct imx_media_pixfmt *incc;
1223         struct v4l2_mbus_framefmt *infmt;
1224         int ret = 0;
1225
1226         mutex_lock(&priv->lock);
1227
1228         infmt = __csi_get_fmt(priv, cfg, CSI_SINK_PAD, code->which);
1229         incc = imx_media_find_mbus_format(infmt->code, CS_SEL_ANY, true);
1230
1231         switch (code->pad) {
1232         case CSI_SINK_PAD:
1233                 ret = imx_media_enum_mbus_format(&code->code, code->index,
1234                                                  CS_SEL_ANY, true);
1235                 break;
1236         case CSI_SRC_PAD_DIRECT:
1237         case CSI_SRC_PAD_IDMAC:
1238                 ret = csi_get_upstream_endpoint(priv, &upstream_ep);
1239                 if (ret) {
1240                         v4l2_err(&priv->sd, "failed to find upstream endpoint\n");
1241                         goto out;
1242                 }
1243
1244                 if (requires_passthrough(&upstream_ep, infmt, incc)) {
1245                         if (code->index != 0) {
1246                                 ret = -EINVAL;
1247                                 goto out;
1248                         }
1249                         code->code = infmt->code;
1250                 } else {
1251                         u32 cs_sel = (incc->cs == IPUV3_COLORSPACE_YUV) ?
1252                                 CS_SEL_YUV : CS_SEL_RGB;
1253                         ret = imx_media_enum_ipu_format(&code->code,
1254                                                         code->index,
1255                                                         cs_sel);
1256                 }
1257                 break;
1258         default:
1259                 ret = -EINVAL;
1260         }
1261
1262 out:
1263         mutex_unlock(&priv->lock);
1264         return ret;
1265 }
1266
1267 static int csi_enum_frame_size(struct v4l2_subdev *sd,
1268                                struct v4l2_subdev_pad_config *cfg,
1269                                struct v4l2_subdev_frame_size_enum *fse)
1270 {
1271         struct csi_priv *priv = v4l2_get_subdevdata(sd);
1272         struct v4l2_rect *crop;
1273         int ret = 0;
1274
1275         if (fse->pad >= CSI_NUM_PADS ||
1276             fse->index > (fse->pad == CSI_SINK_PAD ? 0 : 3))
1277                 return -EINVAL;
1278
1279         mutex_lock(&priv->lock);
1280
1281         if (fse->pad == CSI_SINK_PAD) {
1282                 fse->min_width = MIN_W;
1283                 fse->max_width = MAX_W;
1284                 fse->min_height = MIN_H;
1285                 fse->max_height = MAX_H;
1286         } else {
1287                 crop = __csi_get_crop(priv, cfg, fse->which);
1288
1289                 fse->min_width = fse->index & 1 ?
1290                         crop->width / 2 : crop->width;
1291                 fse->max_width = fse->min_width;
1292                 fse->min_height = fse->index & 2 ?
1293                         crop->height / 2 : crop->height;
1294                 fse->max_height = fse->min_height;
1295         }
1296
1297         mutex_unlock(&priv->lock);
1298         return ret;
1299 }
1300
1301 static int csi_enum_frame_interval(struct v4l2_subdev *sd,
1302                                    struct v4l2_subdev_pad_config *cfg,
1303                                    struct v4l2_subdev_frame_interval_enum *fie)
1304 {
1305         struct csi_priv *priv = v4l2_get_subdevdata(sd);
1306         struct v4l2_fract *input_fi;
1307         struct v4l2_rect *crop;
1308         int ret = 0;
1309
1310         if (fie->pad >= CSI_NUM_PADS ||
1311             fie->index >= (fie->pad != CSI_SRC_PAD_IDMAC ?
1312                            1 : ARRAY_SIZE(csi_skip)))
1313                 return -EINVAL;
1314
1315         mutex_lock(&priv->lock);
1316
1317         input_fi = &priv->frame_interval[CSI_SINK_PAD];
1318         crop = __csi_get_crop(priv, cfg, fie->which);
1319
1320         if ((fie->width != crop->width && fie->width != crop->width / 2) ||
1321             (fie->height != crop->height && fie->height != crop->height / 2)) {
1322                 ret = -EINVAL;
1323                 goto out;
1324         }
1325
1326         fie->interval = *input_fi;
1327
1328         if (fie->pad == CSI_SRC_PAD_IDMAC)
1329                 csi_apply_skip_interval(&csi_skip[fie->index],
1330                                         &fie->interval);
1331
1332 out:
1333         mutex_unlock(&priv->lock);
1334         return ret;
1335 }
1336
1337 static int csi_get_fmt(struct v4l2_subdev *sd,
1338                        struct v4l2_subdev_pad_config *cfg,
1339                        struct v4l2_subdev_format *sdformat)
1340 {
1341         struct csi_priv *priv = v4l2_get_subdevdata(sd);
1342         struct v4l2_mbus_framefmt *fmt;
1343         int ret = 0;
1344
1345         if (sdformat->pad >= CSI_NUM_PADS)
1346                 return -EINVAL;
1347
1348         mutex_lock(&priv->lock);
1349
1350         fmt = __csi_get_fmt(priv, cfg, sdformat->pad, sdformat->which);
1351         if (!fmt) {
1352                 ret = -EINVAL;
1353                 goto out;
1354         }
1355
1356         sdformat->format = *fmt;
1357 out:
1358         mutex_unlock(&priv->lock);
1359         return ret;
1360 }
1361
1362 static void csi_try_field(struct csi_priv *priv,
1363                           struct v4l2_subdev_pad_config *cfg,
1364                           struct v4l2_subdev_format *sdformat)
1365 {
1366         struct v4l2_mbus_framefmt *infmt =
1367                 __csi_get_fmt(priv, cfg, CSI_SINK_PAD, sdformat->which);
1368
1369         /* no restrictions on sink pad field type */
1370         if (sdformat->pad == CSI_SINK_PAD)
1371                 return;
1372
1373         switch (infmt->field) {
1374         case V4L2_FIELD_SEQ_TB:
1375         case V4L2_FIELD_SEQ_BT:
1376                 /*
1377                  * If the user requests sequential at the source pad,
1378                  * allow it (along with possibly inverting field order).
1379                  * Otherwise passthrough the field type.
1380                  */
1381                 if (!V4L2_FIELD_IS_SEQUENTIAL(sdformat->format.field))
1382                         sdformat->format.field = infmt->field;
1383                 break;
1384         case V4L2_FIELD_ALTERNATE:
1385                 /*
1386                  * This driver does not support alternate field mode, and
1387                  * the CSI captures a whole frame, so the CSI never presents
1388                  * alternate mode at its source pads. If user has not
1389                  * already requested sequential, translate ALTERNATE at
1390                  * sink pad to SEQ_TB or SEQ_BT at the source pad depending
1391                  * on input height (assume NTSC BT order if 480 total active
1392                  * frame lines, otherwise PAL TB order).
1393                  */
1394                 if (!V4L2_FIELD_IS_SEQUENTIAL(sdformat->format.field))
1395                         sdformat->format.field = (infmt->height == 480 / 2) ?
1396                                 V4L2_FIELD_SEQ_BT : V4L2_FIELD_SEQ_TB;
1397                 break;
1398         default:
1399                 /* Passthrough for all other input field types */
1400                 sdformat->format.field = infmt->field;
1401                 break;
1402         }
1403 }
1404
1405 static void csi_try_fmt(struct csi_priv *priv,
1406                         struct v4l2_fwnode_endpoint *upstream_ep,
1407                         struct v4l2_subdev_pad_config *cfg,
1408                         struct v4l2_subdev_format *sdformat,
1409                         struct v4l2_rect *crop,
1410                         struct v4l2_rect *compose,
1411                         const struct imx_media_pixfmt **cc)
1412 {
1413         const struct imx_media_pixfmt *incc;
1414         struct v4l2_mbus_framefmt *infmt;
1415         u32 code;
1416
1417         infmt = __csi_get_fmt(priv, cfg, CSI_SINK_PAD, sdformat->which);
1418
1419         switch (sdformat->pad) {
1420         case CSI_SRC_PAD_DIRECT:
1421         case CSI_SRC_PAD_IDMAC:
1422                 incc = imx_media_find_mbus_format(infmt->code,
1423                                                   CS_SEL_ANY, true);
1424
1425                 sdformat->format.width = compose->width;
1426                 sdformat->format.height = compose->height;
1427
1428                 if (requires_passthrough(upstream_ep, infmt, incc)) {
1429                         sdformat->format.code = infmt->code;
1430                         *cc = incc;
1431                 } else {
1432                         u32 cs_sel = (incc->cs == IPUV3_COLORSPACE_YUV) ?
1433                                 CS_SEL_YUV : CS_SEL_RGB;
1434
1435                         *cc = imx_media_find_ipu_format(sdformat->format.code,
1436                                                         cs_sel);
1437                         if (!*cc) {
1438                                 imx_media_enum_ipu_format(&code, 0, cs_sel);
1439                                 *cc = imx_media_find_ipu_format(code, cs_sel);
1440                                 sdformat->format.code = (*cc)->codes[0];
1441                         }
1442                 }
1443
1444                 csi_try_field(priv, cfg, sdformat);
1445
1446                 /* propagate colorimetry from sink */
1447                 sdformat->format.colorspace = infmt->colorspace;
1448                 sdformat->format.xfer_func = infmt->xfer_func;
1449                 sdformat->format.quantization = infmt->quantization;
1450                 sdformat->format.ycbcr_enc = infmt->ycbcr_enc;
1451
1452                 break;
1453         case CSI_SINK_PAD:
1454                 v4l_bound_align_image(&sdformat->format.width, MIN_W, MAX_W,
1455                                       W_ALIGN, &sdformat->format.height,
1456                                       MIN_H, MAX_H, H_ALIGN, S_ALIGN);
1457
1458                 *cc = imx_media_find_mbus_format(sdformat->format.code,
1459                                                  CS_SEL_ANY, true);
1460                 if (!*cc) {
1461                         imx_media_enum_mbus_format(&code, 0,
1462                                                    CS_SEL_ANY, false);
1463                         *cc = imx_media_find_mbus_format(code,
1464                                                         CS_SEL_ANY, false);
1465                         sdformat->format.code = (*cc)->codes[0];
1466                 }
1467
1468                 csi_try_field(priv, cfg, sdformat);
1469
1470                 imx_media_fill_default_mbus_fields(
1471                         &sdformat->format, infmt,
1472                         priv->active_output_pad == CSI_SRC_PAD_DIRECT);
1473
1474                 /* Reset crop and compose rectangles */
1475                 crop->left = 0;
1476                 crop->top = 0;
1477                 crop->width = sdformat->format.width;
1478                 crop->height = sdformat->format.height;
1479                 if (sdformat->format.field == V4L2_FIELD_ALTERNATE)
1480                         crop->height *= 2;
1481                 csi_try_crop(priv, crop, cfg, &sdformat->format, upstream_ep);
1482                 compose->left = 0;
1483                 compose->top = 0;
1484                 compose->width = crop->width;
1485                 compose->height = crop->height;
1486
1487                 break;
1488         }
1489 }
1490
1491 static int csi_set_fmt(struct v4l2_subdev *sd,
1492                        struct v4l2_subdev_pad_config *cfg,
1493                        struct v4l2_subdev_format *sdformat)
1494 {
1495         struct csi_priv *priv = v4l2_get_subdevdata(sd);
1496         struct imx_media_video_dev *vdev = priv->vdev;
1497         struct v4l2_fwnode_endpoint upstream_ep = { .bus_type = 0 };
1498         const struct imx_media_pixfmt *cc;
1499         struct v4l2_pix_format vdev_fmt;
1500         struct v4l2_mbus_framefmt *fmt;
1501         struct v4l2_rect *crop, *compose;
1502         int ret;
1503
1504         if (sdformat->pad >= CSI_NUM_PADS)
1505                 return -EINVAL;
1506
1507         ret = csi_get_upstream_endpoint(priv, &upstream_ep);
1508         if (ret) {
1509                 v4l2_err(&priv->sd, "failed to find upstream endpoint\n");
1510                 return ret;
1511         }
1512
1513         mutex_lock(&priv->lock);
1514
1515         if (priv->stream_count > 0) {
1516                 ret = -EBUSY;
1517                 goto out;
1518         }
1519
1520         crop = __csi_get_crop(priv, cfg, sdformat->which);
1521         compose = __csi_get_compose(priv, cfg, sdformat->which);
1522
1523         csi_try_fmt(priv, &upstream_ep, cfg, sdformat, crop, compose, &cc);
1524
1525         fmt = __csi_get_fmt(priv, cfg, sdformat->pad, sdformat->which);
1526         *fmt = sdformat->format;
1527
1528         if (sdformat->pad == CSI_SINK_PAD) {
1529                 int pad;
1530
1531                 /* propagate format to source pads */
1532                 for (pad = CSI_SINK_PAD + 1; pad < CSI_NUM_PADS; pad++) {
1533                         const struct imx_media_pixfmt *outcc;
1534                         struct v4l2_mbus_framefmt *outfmt;
1535                         struct v4l2_subdev_format format;
1536
1537                         format.pad = pad;
1538                         format.which = sdformat->which;
1539                         format.format = sdformat->format;
1540                         csi_try_fmt(priv, &upstream_ep, cfg, &format,
1541                                     NULL, compose, &outcc);
1542
1543                         outfmt = __csi_get_fmt(priv, cfg, pad, sdformat->which);
1544                         *outfmt = format.format;
1545
1546                         if (sdformat->which == V4L2_SUBDEV_FORMAT_ACTIVE)
1547                                 priv->cc[pad] = outcc;
1548                 }
1549         }
1550
1551         if (sdformat->which == V4L2_SUBDEV_FORMAT_TRY)
1552                 goto out;
1553
1554         priv->cc[sdformat->pad] = cc;
1555
1556         /* propagate IDMAC output pad format to capture device */
1557         imx_media_mbus_fmt_to_pix_fmt(&vdev_fmt,
1558                                       &priv->format_mbus[CSI_SRC_PAD_IDMAC],
1559                                       priv->cc[CSI_SRC_PAD_IDMAC]);
1560         mutex_unlock(&priv->lock);
1561         imx_media_capture_device_set_format(vdev, &vdev_fmt);
1562
1563         return 0;
1564 out:
1565         mutex_unlock(&priv->lock);
1566         return ret;
1567 }
1568
1569 static int csi_get_selection(struct v4l2_subdev *sd,
1570                              struct v4l2_subdev_pad_config *cfg,
1571                              struct v4l2_subdev_selection *sel)
1572 {
1573         struct csi_priv *priv = v4l2_get_subdevdata(sd);
1574         struct v4l2_mbus_framefmt *infmt;
1575         struct v4l2_rect *crop, *compose;
1576         int ret = 0;
1577
1578         if (sel->pad != CSI_SINK_PAD)
1579                 return -EINVAL;
1580
1581         mutex_lock(&priv->lock);
1582
1583         infmt = __csi_get_fmt(priv, cfg, CSI_SINK_PAD, sel->which);
1584         crop = __csi_get_crop(priv, cfg, sel->which);
1585         compose = __csi_get_compose(priv, cfg, sel->which);
1586
1587         switch (sel->target) {
1588         case V4L2_SEL_TGT_CROP_BOUNDS:
1589                 sel->r.left = 0;
1590                 sel->r.top = 0;
1591                 sel->r.width = infmt->width;
1592                 sel->r.height = infmt->height;
1593                 if (infmt->field == V4L2_FIELD_ALTERNATE)
1594                         sel->r.height *= 2;
1595                 break;
1596         case V4L2_SEL_TGT_CROP:
1597                 sel->r = *crop;
1598                 break;
1599         case V4L2_SEL_TGT_COMPOSE_BOUNDS:
1600                 sel->r.left = 0;
1601                 sel->r.top = 0;
1602                 sel->r.width = crop->width;
1603                 sel->r.height = crop->height;
1604                 break;
1605         case V4L2_SEL_TGT_COMPOSE:
1606                 sel->r = *compose;
1607                 break;
1608         default:
1609                 ret = -EINVAL;
1610         }
1611
1612         mutex_unlock(&priv->lock);
1613         return ret;
1614 }
1615
1616 static int csi_set_scale(u32 *compose, u32 crop, u32 flags)
1617 {
1618         if ((flags & (V4L2_SEL_FLAG_LE | V4L2_SEL_FLAG_GE)) ==
1619                      (V4L2_SEL_FLAG_LE | V4L2_SEL_FLAG_GE) &&
1620             *compose != crop && *compose != crop / 2)
1621                 return -ERANGE;
1622
1623         if (*compose <= crop / 2 ||
1624             (*compose < crop * 3 / 4 && !(flags & V4L2_SEL_FLAG_GE)) ||
1625             (*compose < crop && (flags & V4L2_SEL_FLAG_LE)))
1626                 *compose = crop / 2;
1627         else
1628                 *compose = crop;
1629
1630         return 0;
1631 }
1632
1633 static int csi_set_selection(struct v4l2_subdev *sd,
1634                              struct v4l2_subdev_pad_config *cfg,
1635                              struct v4l2_subdev_selection *sel)
1636 {
1637         struct csi_priv *priv = v4l2_get_subdevdata(sd);
1638         struct v4l2_fwnode_endpoint upstream_ep = { .bus_type = 0 };
1639         struct v4l2_mbus_framefmt *infmt;
1640         struct v4l2_rect *crop, *compose;
1641         int pad, ret;
1642
1643         if (sel->pad != CSI_SINK_PAD)
1644                 return -EINVAL;
1645
1646         ret = csi_get_upstream_endpoint(priv, &upstream_ep);
1647         if (ret) {
1648                 v4l2_err(&priv->sd, "failed to find upstream endpoint\n");
1649                 return ret;
1650         }
1651
1652         mutex_lock(&priv->lock);
1653
1654         if (priv->stream_count > 0) {
1655                 ret = -EBUSY;
1656                 goto out;
1657         }
1658
1659         infmt = __csi_get_fmt(priv, cfg, CSI_SINK_PAD, sel->which);
1660         crop = __csi_get_crop(priv, cfg, sel->which);
1661         compose = __csi_get_compose(priv, cfg, sel->which);
1662
1663         switch (sel->target) {
1664         case V4L2_SEL_TGT_CROP:
1665                 /*
1666                  * Modifying the crop rectangle always changes the format on
1667                  * the source pads. If the KEEP_CONFIG flag is set, just return
1668                  * the current crop rectangle.
1669                  */
1670                 if (sel->flags & V4L2_SEL_FLAG_KEEP_CONFIG) {
1671                         sel->r = priv->crop;
1672                         if (sel->which == V4L2_SUBDEV_FORMAT_TRY)
1673                                 *crop = sel->r;
1674                         goto out;
1675                 }
1676
1677                 csi_try_crop(priv, &sel->r, cfg, infmt, &upstream_ep);
1678
1679                 *crop = sel->r;
1680
1681                 /* Reset scaling to 1:1 */
1682                 compose->width = crop->width;
1683                 compose->height = crop->height;
1684                 break;
1685         case V4L2_SEL_TGT_COMPOSE:
1686                 /*
1687                  * Modifying the compose rectangle always changes the format on
1688                  * the source pads. If the KEEP_CONFIG flag is set, just return
1689                  * the current compose rectangle.
1690                  */
1691                 if (sel->flags & V4L2_SEL_FLAG_KEEP_CONFIG) {
1692                         sel->r = priv->compose;
1693                         if (sel->which == V4L2_SUBDEV_FORMAT_TRY)
1694                                 *compose = sel->r;
1695                         goto out;
1696                 }
1697
1698                 sel->r.left = 0;
1699                 sel->r.top = 0;
1700                 ret = csi_set_scale(&sel->r.width, crop->width, sel->flags);
1701                 if (ret)
1702                         goto out;
1703                 ret = csi_set_scale(&sel->r.height, crop->height, sel->flags);
1704                 if (ret)
1705                         goto out;
1706
1707                 *compose = sel->r;
1708                 break;
1709         default:
1710                 ret = -EINVAL;
1711                 goto out;
1712         }
1713
1714         /* Reset source pads to sink compose rectangle */
1715         for (pad = CSI_SINK_PAD + 1; pad < CSI_NUM_PADS; pad++) {
1716                 struct v4l2_mbus_framefmt *outfmt;
1717
1718                 outfmt = __csi_get_fmt(priv, cfg, pad, sel->which);
1719                 outfmt->width = compose->width;
1720                 outfmt->height = compose->height;
1721         }
1722
1723 out:
1724         mutex_unlock(&priv->lock);
1725         return ret;
1726 }
1727
1728 static int csi_subscribe_event(struct v4l2_subdev *sd, struct v4l2_fh *fh,
1729                                struct v4l2_event_subscription *sub)
1730 {
1731         if (sub->type != V4L2_EVENT_IMX_FRAME_INTERVAL_ERROR)
1732                 return -EINVAL;
1733         if (sub->id != 0)
1734                 return -EINVAL;
1735
1736         return v4l2_event_subscribe(fh, sub, 0, NULL);
1737 }
1738
1739 static int csi_unsubscribe_event(struct v4l2_subdev *sd, struct v4l2_fh *fh,
1740                                  struct v4l2_event_subscription *sub)
1741 {
1742         return v4l2_event_unsubscribe(fh, sub);
1743 }
1744
1745 /*
1746  * retrieve our pads parsed from the OF graph by the media device
1747  */
1748 static int csi_registered(struct v4l2_subdev *sd)
1749 {
1750         struct csi_priv *priv = v4l2_get_subdevdata(sd);
1751         struct ipu_csi *csi;
1752         int i, ret;
1753         u32 code;
1754
1755         /* get media device */
1756         priv->md = dev_get_drvdata(sd->v4l2_dev->dev);
1757
1758         /* get handle to IPU CSI */
1759         csi = ipu_csi_get(priv->ipu, priv->csi_id);
1760         if (IS_ERR(csi)) {
1761                 v4l2_err(&priv->sd, "failed to get CSI%d\n", priv->csi_id);
1762                 return PTR_ERR(csi);
1763         }
1764         priv->csi = csi;
1765
1766         for (i = 0; i < CSI_NUM_PADS; i++) {
1767                 priv->pad[i].flags = (i == CSI_SINK_PAD) ?
1768                         MEDIA_PAD_FL_SINK : MEDIA_PAD_FL_SOURCE;
1769
1770                 code = 0;
1771                 if (i != CSI_SINK_PAD)
1772                         imx_media_enum_ipu_format(&code, 0, CS_SEL_YUV);
1773
1774                 /* set a default mbus format  */
1775                 ret = imx_media_init_mbus_fmt(&priv->format_mbus[i],
1776                                               640, 480, code, V4L2_FIELD_NONE,
1777                                               &priv->cc[i]);
1778                 if (ret)
1779                         goto put_csi;
1780
1781                 /* init default frame interval */
1782                 priv->frame_interval[i].numerator = 1;
1783                 priv->frame_interval[i].denominator = 30;
1784         }
1785
1786         /* disable frame skipping */
1787         priv->skip = &csi_skip[0];
1788
1789         /* init default crop and compose rectangle sizes */
1790         priv->crop.width = 640;
1791         priv->crop.height = 480;
1792         priv->compose.width = 640;
1793         priv->compose.height = 480;
1794
1795         priv->fim = imx_media_fim_init(&priv->sd);
1796         if (IS_ERR(priv->fim)) {
1797                 ret = PTR_ERR(priv->fim);
1798                 goto put_csi;
1799         }
1800
1801         ret = media_entity_pads_init(&sd->entity, CSI_NUM_PADS, priv->pad);
1802         if (ret)
1803                 goto free_fim;
1804
1805         ret = imx_media_capture_device_register(priv->vdev);
1806         if (ret)
1807                 goto free_fim;
1808
1809         ret = imx_media_add_video_device(priv->md, priv->vdev);
1810         if (ret)
1811                 goto unreg;
1812
1813         return 0;
1814 unreg:
1815         imx_media_capture_device_unregister(priv->vdev);
1816 free_fim:
1817         if (priv->fim)
1818                 imx_media_fim_free(priv->fim);
1819 put_csi:
1820         ipu_csi_put(priv->csi);
1821         return ret;
1822 }
1823
1824 static void csi_unregistered(struct v4l2_subdev *sd)
1825 {
1826         struct csi_priv *priv = v4l2_get_subdevdata(sd);
1827
1828         imx_media_capture_device_unregister(priv->vdev);
1829
1830         if (priv->fim)
1831                 imx_media_fim_free(priv->fim);
1832
1833         if (priv->csi)
1834                 ipu_csi_put(priv->csi);
1835 }
1836
1837 static const struct media_entity_operations csi_entity_ops = {
1838         .link_setup = csi_link_setup,
1839         .link_validate = v4l2_subdev_link_validate,
1840 };
1841
1842 static const struct v4l2_subdev_core_ops csi_core_ops = {
1843         .subscribe_event = csi_subscribe_event,
1844         .unsubscribe_event = csi_unsubscribe_event,
1845 };
1846
1847 static const struct v4l2_subdev_video_ops csi_video_ops = {
1848         .g_frame_interval = csi_g_frame_interval,
1849         .s_frame_interval = csi_s_frame_interval,
1850         .s_stream = csi_s_stream,
1851 };
1852
1853 static const struct v4l2_subdev_pad_ops csi_pad_ops = {
1854         .init_cfg = imx_media_init_cfg,
1855         .enum_mbus_code = csi_enum_mbus_code,
1856         .enum_frame_size = csi_enum_frame_size,
1857         .enum_frame_interval = csi_enum_frame_interval,
1858         .get_fmt = csi_get_fmt,
1859         .set_fmt = csi_set_fmt,
1860         .get_selection = csi_get_selection,
1861         .set_selection = csi_set_selection,
1862         .link_validate = csi_link_validate,
1863 };
1864
1865 static const struct v4l2_subdev_ops csi_subdev_ops = {
1866         .core = &csi_core_ops,
1867         .video = &csi_video_ops,
1868         .pad = &csi_pad_ops,
1869 };
1870
1871 static const struct v4l2_subdev_internal_ops csi_internal_ops = {
1872         .registered = csi_registered,
1873         .unregistered = csi_unregistered,
1874 };
1875
1876 static int imx_csi_parse_endpoint(struct device *dev,
1877                                   struct v4l2_fwnode_endpoint *vep,
1878                                   struct v4l2_async_subdev *asd)
1879 {
1880         return fwnode_device_is_available(asd->match.fwnode) ? 0 : -ENOTCONN;
1881 }
1882
1883 static int imx_csi_async_register(struct csi_priv *priv)
1884 {
1885         struct v4l2_async_notifier *notifier;
1886         struct fwnode_handle *fwnode;
1887         unsigned int port;
1888         int ret;
1889
1890         notifier = kzalloc(sizeof(*notifier), GFP_KERNEL);
1891         if (!notifier)
1892                 return -ENOMEM;
1893
1894         v4l2_async_notifier_init(notifier);
1895
1896         fwnode = dev_fwnode(priv->dev);
1897
1898         /* get this CSI's port id */
1899         ret = fwnode_property_read_u32(fwnode, "reg", &port);
1900         if (ret < 0)
1901                 goto out_free;
1902
1903         ret = v4l2_async_notifier_parse_fwnode_endpoints_by_port(
1904                 priv->dev->parent, notifier, sizeof(struct v4l2_async_subdev),
1905                 port, imx_csi_parse_endpoint);
1906         if (ret < 0)
1907                 goto out_cleanup;
1908
1909         ret = v4l2_async_subdev_notifier_register(&priv->sd, notifier);
1910         if (ret < 0)
1911                 goto out_cleanup;
1912
1913         ret = v4l2_async_register_subdev(&priv->sd);
1914         if (ret < 0)
1915                 goto out_unregister;
1916
1917         priv->sd.subdev_notifier = notifier;
1918
1919         return 0;
1920
1921 out_unregister:
1922         v4l2_async_notifier_unregister(notifier);
1923 out_cleanup:
1924         v4l2_async_notifier_cleanup(notifier);
1925 out_free:
1926         kfree(notifier);
1927
1928         return ret;
1929 }
1930
1931 static int imx_csi_probe(struct platform_device *pdev)
1932 {
1933         struct ipu_client_platformdata *pdata;
1934         struct pinctrl *pinctrl;
1935         struct csi_priv *priv;
1936         int ret;
1937
1938         priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL);
1939         if (!priv)
1940                 return -ENOMEM;
1941
1942         platform_set_drvdata(pdev, &priv->sd);
1943         priv->dev = &pdev->dev;
1944
1945         ret = dma_set_coherent_mask(priv->dev, DMA_BIT_MASK(32));
1946         if (ret)
1947                 return ret;
1948
1949         /* get parent IPU */
1950         priv->ipu = dev_get_drvdata(priv->dev->parent);
1951
1952         /* get our CSI id */
1953         pdata = priv->dev->platform_data;
1954         priv->csi_id = pdata->csi;
1955         priv->smfc_id = (priv->csi_id == 0) ? 0 : 2;
1956
1957         priv->active_output_pad = CSI_SRC_PAD_IDMAC;
1958
1959         timer_setup(&priv->eof_timeout_timer, csi_idmac_eof_timeout, 0);
1960         spin_lock_init(&priv->irqlock);
1961
1962         v4l2_subdev_init(&priv->sd, &csi_subdev_ops);
1963         v4l2_set_subdevdata(&priv->sd, priv);
1964         priv->sd.internal_ops = &csi_internal_ops;
1965         priv->sd.entity.ops = &csi_entity_ops;
1966         priv->sd.entity.function = MEDIA_ENT_F_PROC_VIDEO_PIXEL_FORMATTER;
1967         priv->sd.dev = &pdev->dev;
1968         priv->sd.fwnode = of_fwnode_handle(pdata->of_node);
1969         priv->sd.owner = THIS_MODULE;
1970         priv->sd.flags = V4L2_SUBDEV_FL_HAS_DEVNODE | V4L2_SUBDEV_FL_HAS_EVENTS;
1971         priv->sd.grp_id = priv->csi_id ?
1972                 IMX_MEDIA_GRP_ID_CSI1 : IMX_MEDIA_GRP_ID_CSI0;
1973         imx_media_grp_id_to_sd_name(priv->sd.name, sizeof(priv->sd.name),
1974                                     priv->sd.grp_id, ipu_get_num(priv->ipu));
1975
1976         priv->vdev = imx_media_capture_device_init(&priv->sd,
1977                                                    CSI_SRC_PAD_IDMAC);
1978         if (IS_ERR(priv->vdev))
1979                 return PTR_ERR(priv->vdev);
1980
1981         mutex_init(&priv->lock);
1982
1983         v4l2_ctrl_handler_init(&priv->ctrl_hdlr, 0);
1984         priv->sd.ctrl_handler = &priv->ctrl_hdlr;
1985
1986         /*
1987          * The IPUv3 driver did not assign an of_node to this
1988          * device. As a result, pinctrl does not automatically
1989          * configure our pin groups, so we need to do that manually
1990          * here, after setting this device's of_node.
1991          */
1992         priv->dev->of_node = pdata->of_node;
1993         pinctrl = devm_pinctrl_get_select_default(priv->dev);
1994         if (IS_ERR(pinctrl)) {
1995                 ret = PTR_ERR(pinctrl);
1996                 dev_dbg(priv->dev,
1997                         "devm_pinctrl_get_select_default() failed: %d\n", ret);
1998                 if (ret != -ENODEV)
1999                         goto free;
2000         }
2001
2002         ret = imx_csi_async_register(priv);
2003         if (ret)
2004                 goto free;
2005
2006         return 0;
2007 free:
2008         v4l2_ctrl_handler_free(&priv->ctrl_hdlr);
2009         mutex_destroy(&priv->lock);
2010         imx_media_capture_device_remove(priv->vdev);
2011         return ret;
2012 }
2013
2014 static int imx_csi_remove(struct platform_device *pdev)
2015 {
2016         struct v4l2_subdev *sd = platform_get_drvdata(pdev);
2017         struct csi_priv *priv = sd_to_dev(sd);
2018
2019         v4l2_ctrl_handler_free(&priv->ctrl_hdlr);
2020         mutex_destroy(&priv->lock);
2021         imx_media_capture_device_remove(priv->vdev);
2022         v4l2_async_unregister_subdev(sd);
2023         media_entity_cleanup(&sd->entity);
2024
2025         return 0;
2026 }
2027
2028 static const struct platform_device_id imx_csi_ids[] = {
2029         { .name = "imx-ipuv3-csi" },
2030         { },
2031 };
2032 MODULE_DEVICE_TABLE(platform, imx_csi_ids);
2033
2034 static struct platform_driver imx_csi_driver = {
2035         .probe = imx_csi_probe,
2036         .remove = imx_csi_remove,
2037         .id_table = imx_csi_ids,
2038         .driver = {
2039                 .name = "imx-ipuv3-csi",
2040         },
2041 };
2042 module_platform_driver(imx_csi_driver);
2043
2044 MODULE_DESCRIPTION("i.MX CSI subdev driver");
2045 MODULE_AUTHOR("Steve Longerbeam <steve_longerbeam@mentor.com>");
2046 MODULE_LICENSE("GPL");
2047 MODULE_ALIAS("platform:imx-ipuv3-csi");