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

   1 // SPDX-License-Identifier: GPL-2.0+
   2 /*
   3  * V4L2 Capture CSI Subdev for Freescale i.MX5/6 SOC
   4  *
   5  * Copyright (c) 2014-2017 Mentor Graphics Inc.
   6  * Copyright (C) 2017 Pengutronix, Philipp Zabel <kernel@pengutronix.de>
   7  */
   8 #include <linux/delay.h>
   9 #include <linux/gcd.h>
  10 #include <linux/interrupt.h>
  11 #include <linux/module.h>
  12 #include <linux/of_graph.h>
  13 #include <linux/pinctrl/consumer.h>
  14 #include <linux/platform_device.h>
  15 #include <media/v4l2-ctrls.h>
  16 #include <media/v4l2-device.h>
  17 #include <media/v4l2-event.h>
  18 #include <media/v4l2-fwnode.h>
  19 #include <media/v4l2-mc.h>
  20 #include <media/v4l2-subdev.h>
  21 #include <media/videobuf2-dma-contig.h>
  22 #include <video/imx-ipu-v3.h>
  23 #include <media/imx.h>
  24 #include "imx-media.h"
  25
  26 /*
  27  * Min/Max supported width and heights.
  28  *
  29  * We allow planar output, so we have to align width by 16 pixels
  30  * to meet IDMAC alignment requirements.
  31  *
  32  * TODO: move this into pad format negotiation, if capture device
  33  * has not requested planar formats, we should allow 8 pixel
  34  * alignment.
  35  */
  36 #define MIN_W       32
  37 #define MIN_H       32
  38 #define MAX_W      4096
  39 #define MAX_H      4096
  40 #define W_ALIGN    1 /* multiple of 2 pixels */
  41 #define H_ALIGN    1 /* multiple of 2 lines */
  42 #define S_ALIGN    1 /* multiple of 2 */
  43
  44 /*
  45  * struct csi_skip_desc - CSI frame skipping descriptor
  46  * @keep - number of frames kept per max_ratio frames
  47  * @max_ratio - width of skip_smfc, written to MAX_RATIO bitfield
  48  * @skip_smfc - skip pattern written to the SKIP_SMFC bitfield
  49  */
  50 struct csi_skip_desc {
  51         u8 keep;
  52         u8 max_ratio;
  53         u8 skip_smfc;
  54 };
  55
  56 struct csi_priv {
  57         struct device *dev;
  58         struct ipu_soc *ipu;
  59         struct v4l2_subdev sd;
  60         struct media_pad pad[CSI_NUM_PADS];
  61         struct v4l2_async_notifier notifier;
  62
  63         /* the video device at IDMAC output pad */
  64         struct imx_media_video_dev *vdev;
  65         struct imx_media_fim *fim;
  66         int csi_id;
  67         int smfc_id;
  68
  69         /* lock to protect all members below */
  70         struct mutex lock;
  71
  72         int active_output_pad;
  73
  74         struct ipuv3_channel *idmac_ch;
  75         struct ipu_smfc *smfc;
  76         struct ipu_csi *csi;
  77
  78         struct v4l2_mbus_framefmt format_mbus[CSI_NUM_PADS];
  79         const struct imx_media_pixfmt *cc[CSI_NUM_PADS];
  80         struct v4l2_fract frame_interval[CSI_NUM_PADS];
  81         struct v4l2_rect crop;
  82         struct v4l2_rect compose;
  83         const struct csi_skip_desc *skip;
  84
  85         /* active vb2 buffers to send to video dev sink */
  86         struct imx_media_buffer *active_vb2_buf[2];
  87         struct imx_media_dma_buf underrun_buf;
  88
  89         int ipu_buf_num;  /* ipu double buffer index: 0-1 */
  90
  91         /* the sink for the captured frames */
  92         struct media_entity *sink;
  93         enum ipu_csi_dest dest;
  94         /* the source subdev */
  95         struct v4l2_subdev *src_sd;
  96
  97         /* the mipi virtual channel number at link validate */
  98         int vc_num;
  99
 100         /* the upstream endpoint CSI is receiving from */
 101         struct v4l2_fwnode_endpoint upstream_ep;
 102
 103         spinlock_t irqlock; /* protect eof_irq handler */
 104         struct timer_list eof_timeout_timer;
 105         int eof_irq;
 106         int nfb4eof_irq;
 107
 108         struct v4l2_ctrl_handler ctrl_hdlr;
 109
 110         int stream_count; /* streaming counter */
 111         u32 frame_sequence; /* frame sequence counter */
 112         bool last_eof;   /* waiting for last EOF at stream off */
 113         bool nfb4eof;    /* NFB4EOF encountered during streaming */
 114         bool interweave_swap; /* swap top/bottom lines when interweaving */
 115         struct completion last_eof_comp;
 116 };
 117
 118 static inline struct csi_priv *sd_to_dev(struct v4l2_subdev *sdev)
 119 {
 120         return container_of(sdev, struct csi_priv, sd);
 121 }
 122
 123 static inline struct csi_priv *notifier_to_dev(struct v4l2_async_notifier *n)
 124 {
 125         return container_of(n, struct csi_priv, notifier);
 126 }
 127
 128 static inline bool is_parallel_bus(struct v4l2_fwnode_endpoint *ep)
 129 {
 130         return ep->bus_type != V4L2_MBUS_CSI2_DPHY;
 131 }
 132
 133 static inline bool is_parallel_16bit_bus(struct v4l2_fwnode_endpoint *ep)
 134 {
 135         return is_parallel_bus(ep) && ep->bus.parallel.bus_width >= 16;
 136 }
 137
 138 /*
 139  * Check for conditions that require the IPU to handle the
 140  * data internally as generic data, aka passthrough mode:
 141  * - raw bayer media bus formats, or
 142  * - the CSI is receiving from a 16-bit parallel bus, or
 143  * - the CSI is receiving from an 8-bit parallel bus and the incoming
 144  *   media bus format is other than UYVY8_2X8/YUYV8_2X8.
 145  */
 146 static inline bool requires_passthrough(struct v4l2_fwnode_endpoint *ep,
 147                                         struct v4l2_mbus_framefmt *infmt,
 148                                         const struct imx_media_pixfmt *incc)
 149 {
 150         return incc->bayer || is_parallel_16bit_bus(ep) ||
 151                 (is_parallel_bus(ep) &&
 152                  infmt->code != MEDIA_BUS_FMT_UYVY8_2X8 &&
 153                  infmt->code != MEDIA_BUS_FMT_YUYV8_2X8);
 154 }
 155
 156 /*
 157  * Parses the fwnode endpoint from the source pad of the entity
 158  * connected to this CSI. This will either be the entity directly
 159  * upstream from the CSI-2 receiver, directly upstream from the
 160  * video mux, or directly upstream from the CSI itself. The endpoint
 161  * is needed to determine the bus type and bus config coming into
 162  * the CSI.
 163  */
 164 static int csi_get_upstream_endpoint(struct csi_priv *priv,
 165                                      struct v4l2_fwnode_endpoint *ep)
 166 {
 167         struct fwnode_handle *endpoint;
 168         struct v4l2_subdev *sd;
 169         struct media_pad *pad;
 170
 171         if (!IS_ENABLED(CONFIG_OF))
 172                 return -ENXIO;
 173
 174         if (!priv->src_sd)
 175                 return -EPIPE;
 176
 177         sd = priv->src_sd;
 178
 179         switch (sd->grp_id) {
 180         case IMX_MEDIA_GRP_ID_CSI_MUX:
 181                 /*
 182                  * CSI is connected directly to CSI mux, skip up to
 183                  * CSI-2 receiver if it is in the path, otherwise stay
 184                  * with the CSI mux.
 185                  */
 186                 sd = imx_media_pipeline_subdev(&sd->entity,
 187                                                IMX_MEDIA_GRP_ID_CSI2,
 188                                                true);
 189                 if (IS_ERR(sd))
 190                         sd = priv->src_sd;
 191                 break;
 192         case IMX_MEDIA_GRP_ID_CSI2:
 193                 break;
 194         default:
 195                 /*
 196                  * the source is neither the CSI mux nor the CSI-2 receiver,
 197                  * get the source pad directly upstream from CSI itself.
 198                  */
 199                 sd = &priv->sd;
 200                 break;
 201         }
 202
 203         /* get source pad of entity directly upstream from sd */
 204         pad = imx_media_pipeline_pad(&sd->entity, 0, 0, true);
 205         if (!pad)
 206                 return -ENODEV;
 207
 208         endpoint = imx_media_get_pad_fwnode(pad);
 209         if (IS_ERR(endpoint))
 210                 return PTR_ERR(endpoint);
 211
 212         v4l2_fwnode_endpoint_parse(endpoint, ep);
 213
 214         fwnode_handle_put(endpoint);
 215
 216         return 0;
 217 }
 218
 219 static void csi_idmac_put_ipu_resources(struct csi_priv *priv)
 220 {
 221         if (priv->idmac_ch)
 222                 ipu_idmac_put(priv->idmac_ch);
 223         priv->idmac_ch = NULL;
 224
 225         if (priv->smfc)
 226                 ipu_smfc_put(priv->smfc);
 227         priv->smfc = NULL;
 228 }
 229
 230 static int csi_idmac_get_ipu_resources(struct csi_priv *priv)
 231 {
 232         int ch_num, ret;
 233         struct ipu_smfc *smfc;
 234         struct ipuv3_channel *idmac_ch;
 235
 236         ch_num = IPUV3_CHANNEL_CSI0 + priv->smfc_id;
 237
 238         smfc = ipu_smfc_get(priv->ipu, ch_num);
 239         if (IS_ERR(smfc)) {
 240                 v4l2_err(&priv->sd, "failed to get SMFC\n");
 241                 ret = PTR_ERR(smfc);
 242                 goto out;
 243         }
 244         priv->smfc = smfc;
 245
 246         idmac_ch = ipu_idmac_get(priv->ipu, ch_num);
 247         if (IS_ERR(idmac_ch)) {
 248                 v4l2_err(&priv->sd, "could not get IDMAC channel %u\n",
 249                          ch_num);
 250                 ret = PTR_ERR(idmac_ch);
 251                 goto out;
 252         }
 253         priv->idmac_ch = idmac_ch;
 254
 255         return 0;
 256 out:
 257         csi_idmac_put_ipu_resources(priv);
 258         return ret;
 259 }
 260
 261 static void csi_vb2_buf_done(struct csi_priv *priv)
 262 {
 263         struct imx_media_video_dev *vdev = priv->vdev;
 264         struct imx_media_buffer *done, *next;
 265         struct vb2_buffer *vb;
 266         dma_addr_t phys;
 267
 268         done = priv->active_vb2_buf[priv->ipu_buf_num];
 269         if (done) {
 270                 done->vbuf.field = vdev->fmt.fmt.pix.field;
 271                 done->vbuf.sequence = priv->frame_sequence;
 272                 vb = &done->vbuf.vb2_buf;
 273                 vb->timestamp = ktime_get_ns();
 274                 vb2_buffer_done(vb, priv->nfb4eof ?
 275                                 VB2_BUF_STATE_ERROR : VB2_BUF_STATE_DONE);
 276         }
 277
 278         priv->frame_sequence++;
 279         priv->nfb4eof = false;
 280
 281         /* get next queued buffer */
 282         next = imx_media_capture_device_next_buf(vdev);
 283         if (next) {
 284                 phys = vb2_dma_contig_plane_dma_addr(&next->vbuf.vb2_buf, 0);
 285                 priv->active_vb2_buf[priv->ipu_buf_num] = next;
 286         } else {
 287                 phys = priv->underrun_buf.phys;
 288                 priv->active_vb2_buf[priv->ipu_buf_num] = NULL;
 289         }
 290
 291         if (ipu_idmac_buffer_is_ready(priv->idmac_ch, priv->ipu_buf_num))
 292                 ipu_idmac_clear_buffer(priv->idmac_ch, priv->ipu_buf_num);
 293
 294         if (priv->interweave_swap)
 295                 phys += vdev->fmt.fmt.pix.bytesperline;
 296
 297         ipu_cpmem_set_buffer(priv->idmac_ch, priv->ipu_buf_num, phys);
 298 }
 299
 300 static irqreturn_t csi_idmac_eof_interrupt(int irq, void *dev_id)
 301 {
 302         struct csi_priv *priv = dev_id;
 303
 304         spin_lock(&priv->irqlock);
 305
 306         if (priv->last_eof) {
 307                 complete(&priv->last_eof_comp);
 308                 priv->last_eof = false;
 309                 goto unlock;
 310         }
 311
 312         if (priv->fim)
 313                 /* call frame interval monitor */
 314                 imx_media_fim_eof_monitor(priv->fim, ktime_get());
 315
 316         csi_vb2_buf_done(priv);
 317
 318         /* select new IPU buf */
 319         ipu_idmac_select_buffer(priv->idmac_ch, priv->ipu_buf_num);
 320         /* toggle IPU double-buffer index */
 321         priv->ipu_buf_num ^= 1;
 322
 323         /* bump the EOF timeout timer */
 324         mod_timer(&priv->eof_timeout_timer,
 325                   jiffies + msecs_to_jiffies(IMX_MEDIA_EOF_TIMEOUT));
 326
 327 unlock:
 328         spin_unlock(&priv->irqlock);
 329         return IRQ_HANDLED;
 330 }
 331
 332 static irqreturn_t csi_idmac_nfb4eof_interrupt(int irq, void *dev_id)
 333 {
 334         struct csi_priv *priv = dev_id;
 335
 336         spin_lock(&priv->irqlock);
 337
 338         /*
 339          * this is not an unrecoverable error, just mark
 340          * the next captured frame with vb2 error flag.
 341          */
 342         priv->nfb4eof = true;
 343
 344         v4l2_err(&priv->sd, "NFB4EOF\n");
 345
 346         spin_unlock(&priv->irqlock);
 347
 348         return IRQ_HANDLED;
 349 }
 350
 351 /*
 352  * EOF timeout timer function. This is an unrecoverable condition
 353  * without a stream restart.
 354  */
 355 static void csi_idmac_eof_timeout(struct timer_list *t)
 356 {
 357         struct csi_priv *priv = from_timer(priv, t, eof_timeout_timer);
 358         struct imx_media_video_dev *vdev = priv->vdev;
 359
 360         v4l2_err(&priv->sd, "EOF timeout\n");
 361
 362         /* signal a fatal error to capture device */
 363         imx_media_capture_device_error(vdev);
 364 }
 365
 366 static void csi_idmac_setup_vb2_buf(struct csi_priv *priv, dma_addr_t *phys)
 367 {
 368         struct imx_media_video_dev *vdev = priv->vdev;
 369         struct imx_media_buffer *buf;
 370         int i;
 371
 372         for (i = 0; i < 2; i++) {
 373                 buf = imx_media_capture_device_next_buf(vdev);
 374                 if (buf) {
 375                         priv->active_vb2_buf[i] = buf;
 376                         phys[i] = vb2_dma_contig_plane_dma_addr(
 377                                 &buf->vbuf.vb2_buf, 0);
 378                 } else {
 379                         priv->active_vb2_buf[i] = NULL;
 380                         phys[i] = priv->underrun_buf.phys;
 381                 }
 382         }
 383 }
 384
 385 static void csi_idmac_unsetup_vb2_buf(struct csi_priv *priv,
 386                                       enum vb2_buffer_state return_status)
 387 {
 388         struct imx_media_buffer *buf;
 389         int i;
 390
 391         /* return any remaining active frames with return_status */
 392         for (i = 0; i < 2; i++) {
 393                 buf = priv->active_vb2_buf[i];
 394                 if (buf) {
 395                         struct vb2_buffer *vb = &buf->vbuf.vb2_buf;
 396
 397                         vb->timestamp = ktime_get_ns();
 398                         vb2_buffer_done(vb, return_status);
 399                 }
 400         }
 401 }
 402
 403 /* init the SMFC IDMAC channel */
 404 static int csi_idmac_setup_channel(struct csi_priv *priv)
 405 {
 406         struct imx_media_video_dev *vdev = priv->vdev;
 407         const struct imx_media_pixfmt *incc;
 408         struct v4l2_mbus_framefmt *infmt;
 409         struct v4l2_mbus_framefmt *outfmt;
 410         bool passthrough, interweave;
 411         struct ipu_image image;
 412         u32 passthrough_bits;
 413         u32 passthrough_cycles;
 414         dma_addr_t phys[2];
 415         u32 burst_size;
 416         int ret;
 417
 418         infmt = &priv->format_mbus[CSI_SINK_PAD];
 419         incc = priv->cc[CSI_SINK_PAD];
 420         outfmt = &priv->format_mbus[CSI_SRC_PAD_IDMAC];
 421
 422         ipu_cpmem_zero(priv->idmac_ch);
 423
 424         memset(&image, 0, sizeof(image));
 425         image.pix = vdev->fmt.fmt.pix;
 426         image.rect = vdev->compose;
 427
 428         csi_idmac_setup_vb2_buf(priv, phys);
 429
 430         image.phys0 = phys[0];
 431         image.phys1 = phys[1];
 432
 433         passthrough = requires_passthrough(&priv->upstream_ep, infmt, incc);
 434         passthrough_cycles = 1;
 435
 436         /*
 437          * If the field type at capture interface is interlaced, and
 438          * the output IDMAC pad is sequential, enable interweave at
 439          * the IDMAC output channel.
 440          */
 441         interweave = V4L2_FIELD_IS_INTERLACED(image.pix.field) &&
 442                 V4L2_FIELD_IS_SEQUENTIAL(outfmt->field);
 443         priv->interweave_swap = interweave &&
 444                 image.pix.field == V4L2_FIELD_INTERLACED_BT;
 445
 446         switch (image.pix.pixelformat) {
 447         case V4L2_PIX_FMT_SBGGR8:
 448         case V4L2_PIX_FMT_SGBRG8:
 449         case V4L2_PIX_FMT_SGRBG8:
 450         case V4L2_PIX_FMT_SRGGB8:
 451         case V4L2_PIX_FMT_GREY:
 452                 burst_size = 16;
 453                 passthrough_bits = 8;
 454                 break;
 455         case V4L2_PIX_FMT_SBGGR16:
 456         case V4L2_PIX_FMT_SGBRG16:
 457         case V4L2_PIX_FMT_SGRBG16:
 458         case V4L2_PIX_FMT_SRGGB16:
 459         case V4L2_PIX_FMT_Y10:
 460         case V4L2_PIX_FMT_Y12:
 461                 burst_size = 8;
 462                 passthrough_bits = 16;
 463                 break;
 464         case V4L2_PIX_FMT_YUV420:
 465         case V4L2_PIX_FMT_YVU420:
 466         case V4L2_PIX_FMT_NV12:
 467                 burst_size = (image.pix.width & 0x3f) ?
 468                              ((image.pix.width & 0x1f) ?
 469                               ((image.pix.width & 0xf) ? 8 : 16) : 32) : 64;
 470                 passthrough_bits = 16;
 471                 /*
 472                  * Skip writing U and V components to odd rows (but not
 473                  * when enabling IDMAC interweaving, they are incompatible).
 474                  */
 475                 if (!interweave)
 476                         ipu_cpmem_skip_odd_chroma_rows(priv->idmac_ch);
 477                 break;
 478         case V4L2_PIX_FMT_YUYV:
 479         case V4L2_PIX_FMT_UYVY:
 480                 burst_size = (image.pix.width & 0x1f) ?
 481                              ((image.pix.width & 0xf) ? 8 : 16) : 32;
 482                 passthrough_bits = 16;
 483                 break;
 484         case V4L2_PIX_FMT_RGB565:
 485                 if (passthrough) {
 486                         burst_size = 16;
 487                         passthrough_bits = 8;
 488                         passthrough_cycles = incc->cycles;
 489                         break;
 490                 }
 491                 /* fallthrough - non-passthrough RGB565 (CSI-2 bus) */
 492         default:
 493                 burst_size = (image.pix.width & 0xf) ? 8 : 16;
 494                 passthrough_bits = 16;
 495                 break;
 496         }
 497
 498         if (passthrough) {
 499                 if (priv->interweave_swap) {
 500                         /* start interweave scan at 1st top line (2nd line) */
 501                         image.phys0 += image.pix.bytesperline;
 502                         image.phys1 += image.pix.bytesperline;
 503                 }
 504
 505                 ipu_cpmem_set_resolution(priv->idmac_ch,
 506                                          image.rect.width * passthrough_cycles,
 507                                          image.rect.height);
 508                 ipu_cpmem_set_stride(priv->idmac_ch, image.pix.bytesperline);
 509                 ipu_cpmem_set_buffer(priv->idmac_ch, 0, image.phys0);
 510                 ipu_cpmem_set_buffer(priv->idmac_ch, 1, image.phys1);
 511                 ipu_cpmem_set_format_passthrough(priv->idmac_ch,
 512                                                  passthrough_bits);
 513         } else {
 514                 if (priv->interweave_swap) {
 515                         /* start interweave scan at 1st top line (2nd line) */
 516                         image.rect.top = 1;
 517                 }
 518
 519                 ret = ipu_cpmem_set_image(priv->idmac_ch, &image);
 520                 if (ret)
 521                         goto unsetup_vb2;
 522         }
 523
 524         ipu_cpmem_set_burstsize(priv->idmac_ch, burst_size);
 525
 526         /*
 527          * Set the channel for the direct CSI-->memory via SMFC
 528          * use-case to very high priority, by enabling the watermark
 529          * signal in the SMFC, enabling WM in the channel, and setting
 530          * the channel priority to high.
 531          *
 532          * Refer to the i.mx6 rev. D TRM Table 36-8: Calculated priority
 533          * value.
 534          *
 535          * The WM's are set very low by intention here to ensure that
 536          * the SMFC FIFOs do not overflow.
 537          */
 538         ipu_smfc_set_watermark(priv->smfc, 0x02, 0x01);
 539         ipu_cpmem_set_high_priority(priv->idmac_ch);
 540         ipu_idmac_enable_watermark(priv->idmac_ch, true);
 541         ipu_cpmem_set_axi_id(priv->idmac_ch, 0);
 542
 543         burst_size = passthrough ?
 544                 (burst_size >> 3) - 1 : (burst_size >> 2) - 1;
 545
 546         ipu_smfc_set_burstsize(priv->smfc, burst_size);
 547
 548         if (interweave)
 549                 ipu_cpmem_interlaced_scan(priv->idmac_ch,
 550                                           priv->interweave_swap ?
 551                                           -image.pix.bytesperline :
 552                                           image.pix.bytesperline,
 553                                           image.pix.pixelformat);
 554
 555         ipu_idmac_set_double_buffer(priv->idmac_ch, true);
 556
 557         return 0;
 558
 559 unsetup_vb2:
 560         csi_idmac_unsetup_vb2_buf(priv, VB2_BUF_STATE_QUEUED);
 561         return ret;
 562 }
 563
 564 static void csi_idmac_unsetup(struct csi_priv *priv,
 565                               enum vb2_buffer_state state)
 566 {
 567         ipu_idmac_disable_channel(priv->idmac_ch);
 568         ipu_smfc_disable(priv->smfc);
 569
 570         csi_idmac_unsetup_vb2_buf(priv, state);
 571 }
 572
 573 static int csi_idmac_setup(struct csi_priv *priv)
 574 {
 575         int ret;
 576
 577         ret = csi_idmac_setup_channel(priv);
 578         if (ret)
 579                 return ret;
 580
 581         ipu_cpmem_dump(priv->idmac_ch);
 582         ipu_dump(priv->ipu);
 583
 584         ipu_smfc_enable(priv->smfc);
 585
 586         /* set buffers ready */
 587         ipu_idmac_select_buffer(priv->idmac_ch, 0);
 588         ipu_idmac_select_buffer(priv->idmac_ch, 1);
 589
 590         /* enable the channels */
 591         ipu_idmac_enable_channel(priv->idmac_ch);
 592
 593         return 0;
 594 }
 595
 596 static int csi_idmac_start(struct csi_priv *priv)
 597 {
 598         struct imx_media_video_dev *vdev = priv->vdev;
 599         struct v4l2_pix_format *outfmt;
 600         int ret;
 601
 602         ret = csi_idmac_get_ipu_resources(priv);
 603         if (ret)
 604                 return ret;
 605
 606         ipu_smfc_map_channel(priv->smfc, priv->csi_id, priv->vc_num);
 607
 608         outfmt = &vdev->fmt.fmt.pix;
 609
 610         ret = imx_media_alloc_dma_buf(priv->dev, &priv->underrun_buf,
 611                                       outfmt->sizeimage);
 612         if (ret)
 613                 goto out_put_ipu;
 614
 615         priv->ipu_buf_num = 0;
 616
 617         /* init EOF completion waitq */
 618         init_completion(&priv->last_eof_comp);
 619         priv->frame_sequence = 0;
 620         priv->last_eof = false;
 621         priv->nfb4eof = false;
 622
 623         ret = csi_idmac_setup(priv);
 624         if (ret) {
 625                 v4l2_err(&priv->sd, "csi_idmac_setup failed: %d\n", ret);
 626                 goto out_free_dma_buf;
 627         }
 628
 629         priv->nfb4eof_irq = ipu_idmac_channel_irq(priv->ipu,
 630                                                   priv->idmac_ch,
 631                                                   IPU_IRQ_NFB4EOF);
 632         ret = devm_request_irq(priv->dev, priv->nfb4eof_irq,
 633                                csi_idmac_nfb4eof_interrupt, 0,
 634                                "imx-smfc-nfb4eof", priv);
 635         if (ret) {
 636                 v4l2_err(&priv->sd,
 637                          "Error registering NFB4EOF irq: %d\n", ret);
 638                 goto out_unsetup;
 639         }
 640
 641         priv->eof_irq = ipu_idmac_channel_irq(priv->ipu, priv->idmac_ch,
 642                                               IPU_IRQ_EOF);
 643
 644         ret = devm_request_irq(priv->dev, priv->eof_irq,
 645                                csi_idmac_eof_interrupt, 0,
 646                                "imx-smfc-eof", priv);
 647         if (ret) {
 648                 v4l2_err(&priv->sd,
 649                          "Error registering eof irq: %d\n", ret);
 650                 goto out_free_nfb4eof_irq;
 651         }
 652
 653         /* start the EOF timeout timer */
 654         mod_timer(&priv->eof_timeout_timer,
 655                   jiffies + msecs_to_jiffies(IMX_MEDIA_EOF_TIMEOUT));
 656
 657         return 0;
 658
 659 out_free_nfb4eof_irq:
 660         devm_free_irq(priv->dev, priv->nfb4eof_irq, priv);
 661 out_unsetup:
 662         csi_idmac_unsetup(priv, VB2_BUF_STATE_QUEUED);
 663 out_free_dma_buf:
 664         imx_media_free_dma_buf(priv->dev, &priv->underrun_buf);
 665 out_put_ipu:
 666         csi_idmac_put_ipu_resources(priv);
 667         return ret;
 668 }
 669
 670 static void csi_idmac_wait_last_eof(struct csi_priv *priv)
 671 {
 672         unsigned long flags;
 673         int ret;
 674
 675         /* mark next EOF interrupt as the last before stream off */
 676         spin_lock_irqsave(&priv->irqlock, flags);
 677         priv->last_eof = true;
 678         spin_unlock_irqrestore(&priv->irqlock, flags);
 679
 680         /*
 681          * and then wait for interrupt handler to mark completion.
 682          */
 683         ret = wait_for_completion_timeout(
 684                 &priv->last_eof_comp, msecs_to_jiffies(IMX_MEDIA_EOF_TIMEOUT));
 685         if (ret == 0)
 686                 v4l2_warn(&priv->sd, "wait last EOF timeout\n");
 687 }
 688
 689 static void csi_idmac_stop(struct csi_priv *priv)
 690 {
 691         devm_free_irq(priv->dev, priv->eof_irq, priv);
 692         devm_free_irq(priv->dev, priv->nfb4eof_irq, priv);
 693
 694         csi_idmac_unsetup(priv, VB2_BUF_STATE_ERROR);
 695
 696         imx_media_free_dma_buf(priv->dev, &priv->underrun_buf);
 697
 698         /* cancel the EOF timeout timer */
 699         del_timer_sync(&priv->eof_timeout_timer);
 700
 701         csi_idmac_put_ipu_resources(priv);
 702 }
 703
 704 /* Update the CSI whole sensor and active windows */
 705 static int csi_setup(struct csi_priv *priv)
 706 {
 707         struct v4l2_mbus_framefmt *infmt, *outfmt;
 708         const struct imx_media_pixfmt *incc;
 709         struct v4l2_mbus_config mbus_cfg;
 710         struct v4l2_mbus_framefmt if_fmt;
 711         struct v4l2_rect crop;
 712
 713         infmt = &priv->format_mbus[CSI_SINK_PAD];
 714         incc = priv->cc[CSI_SINK_PAD];
 715         outfmt = &priv->format_mbus[priv->active_output_pad];
 716
 717         /* compose mbus_config from the upstream endpoint */
 718         mbus_cfg.type = priv->upstream_ep.bus_type;
 719         mbus_cfg.flags = is_parallel_bus(&priv->upstream_ep) ?
 720                 priv->upstream_ep.bus.parallel.flags :
 721                 priv->upstream_ep.bus.mipi_csi2.flags;
 722
 723         if_fmt = *infmt;
 724         crop = priv->crop;
 725
 726         /*
 727          * if cycles is set, we need to handle this over multiple cycles as
 728          * generic/bayer data
 729          */
 730         if (is_parallel_bus(&priv->upstream_ep) && incc->cycles) {
 731                 if_fmt.width *= incc->cycles;
 732                 crop.width *= incc->cycles;
 733         }
 734
 735         ipu_csi_set_window(priv->csi, &crop);
 736
 737         ipu_csi_set_downsize(priv->csi,
 738                              priv->crop.width == 2 * priv->compose.width,
 739                              priv->crop.height == 2 * priv->compose.height);
 740
 741         ipu_csi_init_interface(priv->csi, &mbus_cfg, &if_fmt, outfmt);
 742
 743         ipu_csi_set_dest(priv->csi, priv->dest);
 744
 745         if (priv->dest == IPU_CSI_DEST_IDMAC)
 746                 ipu_csi_set_skip_smfc(priv->csi, priv->skip->skip_smfc,
 747                                       priv->skip->max_ratio - 1, 0);
 748
 749         ipu_csi_dump(priv->csi);
 750
 751         return 0;
 752 }
 753
 754 static int csi_start(struct csi_priv *priv)
 755 {
 756         struct v4l2_fract *output_fi;
 757         int ret;
 758
 759         output_fi = &priv->frame_interval[priv->active_output_pad];
 760
 761         /* start upstream */
 762         ret = v4l2_subdev_call(priv->src_sd, video, s_stream, 1);
 763         ret = (ret && ret != -ENOIOCTLCMD) ? ret : 0;
 764         if (ret)
 765                 return ret;
 766
 767         if (priv->dest == IPU_CSI_DEST_IDMAC) {
 768                 ret = csi_idmac_start(priv);
 769                 if (ret)
 770                         goto stop_upstream;
 771         }
 772
 773         ret = csi_setup(priv);
 774         if (ret)
 775                 goto idmac_stop;
 776
 777         /* start the frame interval monitor */
 778         if (priv->fim && priv->dest == IPU_CSI_DEST_IDMAC) {
 779                 ret = imx_media_fim_set_stream(priv->fim, output_fi, true);
 780                 if (ret)
 781                         goto idmac_stop;
 782         }
 783
 784         ret = ipu_csi_enable(priv->csi);
 785         if (ret) {
 786                 v4l2_err(&priv->sd, "CSI enable error: %d\n", ret);
 787                 goto fim_off;
 788         }
 789
 790         return 0;
 791
 792 fim_off:
 793         if (priv->fim && priv->dest == IPU_CSI_DEST_IDMAC)
 794                 imx_media_fim_set_stream(priv->fim, NULL, false);
 795 idmac_stop:
 796         if (priv->dest == IPU_CSI_DEST_IDMAC)
 797                 csi_idmac_stop(priv);
 798 stop_upstream:
 799         v4l2_subdev_call(priv->src_sd, video, s_stream, 0);
 800         return ret;
 801 }
 802
 803 static void csi_stop(struct csi_priv *priv)
 804 {
 805         if (priv->dest == IPU_CSI_DEST_IDMAC)
 806                 csi_idmac_wait_last_eof(priv);
 807
 808         /*
 809          * Disable the CSI asap, after syncing with the last EOF.
 810          * Doing so after the IDMA channel is disabled has shown to
 811          * create hard system-wide hangs.
 812          */
 813         ipu_csi_disable(priv->csi);
 814
 815         /* stop upstream */
 816         v4l2_subdev_call(priv->src_sd, video, s_stream, 0);
 817
 818         if (priv->dest == IPU_CSI_DEST_IDMAC) {
 819                 csi_idmac_stop(priv);
 820
 821                 /* stop the frame interval monitor */
 822                 if (priv->fim)
 823                         imx_media_fim_set_stream(priv->fim, NULL, false);
 824         }
 825 }
 826
 827 static const struct csi_skip_desc csi_skip[12] = {
 828         { 1, 1, 0x00 }, /* Keep all frames */
 829         { 5, 6, 0x10 }, /* Skip every sixth frame */
 830         { 4, 5, 0x08 }, /* Skip every fifth frame */
 831         { 3, 4, 0x04 }, /* Skip every fourth frame */
 832         { 2, 3, 0x02 }, /* Skip every third frame */
 833         { 3, 5, 0x0a }, /* Skip frames 1 and 3 of every 5 */
 834         { 1, 2, 0x01 }, /* Skip every second frame */
 835         { 2, 5, 0x0b }, /* Keep frames 1 and 4 of every 5 */
 836         { 1, 3, 0x03 }, /* Keep one in three frames */
 837         { 1, 4, 0x07 }, /* Keep one in four frames */
 838         { 1, 5, 0x0f }, /* Keep one in five frames */
 839         { 1, 6, 0x1f }, /* Keep one in six frames */
 840 };
 841
 842 static void csi_apply_skip_interval(const struct csi_skip_desc *skip,
 843                                     struct v4l2_fract *interval)
 844 {
 845         unsigned int div;
 846
 847         interval->numerator *= skip->max_ratio;
 848         interval->denominator *= skip->keep;
 849
 850         /* Reduce fraction to lowest terms */
 851         div = gcd(interval->numerator, interval->denominator);
 852         if (div > 1) {
 853                 interval->numerator /= div;
 854                 interval->denominator /= div;
 855         }
 856 }
 857
 858 /*
 859  * Find the skip pattern to produce the output frame interval closest to the
 860  * requested one, for the given input frame interval. Updates the output frame
 861  * interval to the exact value.
 862  */
 863 static const struct csi_skip_desc *csi_find_best_skip(struct v4l2_fract *in,
 864                                                       struct v4l2_fract *out)
 865 {
 866         const struct csi_skip_desc *skip = &csi_skip[0], *best_skip = skip;
 867         u32 min_err = UINT_MAX;
 868         u64 want_us;
 869         int i;
 870
 871         /* Default to 1:1 ratio */
 872         if (out->numerator == 0 || out->denominator == 0 ||
 873             in->numerator == 0 || in->denominator == 0) {
 874                 *out = *in;
 875                 return best_skip;
 876         }
 877
 878         want_us = div_u64((u64)USEC_PER_SEC * out->numerator, out->denominator);
 879
 880         /* Find the reduction closest to the requested time per frame */
 881         for (i = 0; i < ARRAY_SIZE(csi_skip); i++, skip++) {
 882                 u64 tmp, err;
 883
 884                 tmp = div_u64((u64)USEC_PER_SEC * in->numerator *
 885                               skip->max_ratio, in->denominator * skip->keep);
 886
 887                 err = abs((s64)tmp - want_us);
 888                 if (err < min_err) {
 889                         min_err = err;
 890                         best_skip = skip;
 891                 }
 892         }
 893
 894         *out = *in;
 895         csi_apply_skip_interval(best_skip, out);
 896
 897         return best_skip;
 898 }
 899
 900 /*
 901  * V4L2 subdev operations.
 902  */
 903
 904 static int csi_g_frame_interval(struct v4l2_subdev *sd,
 905                                 struct v4l2_subdev_frame_interval *fi)
 906 {
 907         struct csi_priv *priv = v4l2_get_subdevdata(sd);
 908
 909         if (fi->pad >= CSI_NUM_PADS)
 910                 return -EINVAL;
 911
 912         mutex_lock(&priv->lock);
 913
 914         fi->interval = priv->frame_interval[fi->pad];
 915
 916         mutex_unlock(&priv->lock);
 917
 918         return 0;
 919 }
 920
 921 static int csi_s_frame_interval(struct v4l2_subdev *sd,
 922                                 struct v4l2_subdev_frame_interval *fi)
 923 {
 924         struct csi_priv *priv = v4l2_get_subdevdata(sd);
 925         struct v4l2_fract *input_fi;
 926         int ret = 0;
 927
 928         mutex_lock(&priv->lock);
 929
 930         input_fi = &priv->frame_interval[CSI_SINK_PAD];
 931
 932         switch (fi->pad) {
 933         case CSI_SINK_PAD:
 934                 /* No limits on valid input frame intervals */
 935                 if (fi->interval.numerator == 0 ||
 936                     fi->interval.denominator == 0)
 937                         fi->interval = *input_fi;
 938                 /* Reset output intervals and frame skipping ratio to 1:1 */
 939                 priv->frame_interval[CSI_SRC_PAD_IDMAC] = fi->interval;
 940                 priv->frame_interval[CSI_SRC_PAD_DIRECT] = fi->interval;
 941                 priv->skip = &csi_skip[0];
 942                 break;
 943         case CSI_SRC_PAD_IDMAC:
 944                 /*
 945                  * frame interval at IDMAC output pad depends on input
 946                  * interval, modified by frame skipping.
 947                  */
 948                 priv->skip = csi_find_best_skip(input_fi, &fi->interval);
 949                 break;
 950         case CSI_SRC_PAD_DIRECT:
 951                 /*
 952                  * frame interval at DIRECT output pad is same as input
 953                  * interval.
 954                  */
 955                 fi->interval = *input_fi;
 956                 break;
 957         default:
 958                 ret = -EINVAL;
 959                 goto out;
 960         }
 961
 962         priv->frame_interval[fi->pad] = fi->interval;
 963 out:
 964         mutex_unlock(&priv->lock);
 965         return ret;
 966 }
 967
 968 static int csi_s_stream(struct v4l2_subdev *sd, int enable)
 969 {
 970         struct csi_priv *priv = v4l2_get_subdevdata(sd);
 971         int ret = 0;
 972
 973         mutex_lock(&priv->lock);
 974
 975         if (!priv->src_sd || !priv->sink) {
 976                 ret = -EPIPE;
 977                 goto out;
 978         }
 979
 980         /*
 981          * enable/disable streaming only if stream_count is
 982          * going from 0 to 1 / 1 to 0.
 983          */
 984         if (priv->stream_count != !enable)
 985                 goto update_count;
 986
 987         if (enable) {
 988                 dev_dbg(priv->dev, "stream ON\n");
 989                 ret = csi_start(priv);
 990                 if (ret)
 991                         goto out;
 992         } else {
 993                 dev_dbg(priv->dev, "stream OFF\n");
 994                 csi_stop(priv);
 995         }
 996
 997 update_count:
 998         priv->stream_count += enable ? 1 : -1;
 999         if (priv->stream_count < 0)
1000                 priv->stream_count = 0;
1001 out:
1002         mutex_unlock(&priv->lock);
1003         return ret;
1004 }
1005
1006 static int csi_link_setup(struct media_entity *entity,
1007                           const struct media_pad *local,
1008                           const struct media_pad *remote, u32 flags)
1009 {
1010         struct v4l2_subdev *sd = media_entity_to_v4l2_subdev(entity);
1011         struct csi_priv *priv = v4l2_get_subdevdata(sd);
1012         struct v4l2_subdev *remote_sd;
1013         int ret = 0;
1014
1015         dev_dbg(priv->dev, "link setup %s -> %s\n", remote->entity->name,
1016                 local->entity->name);
1017
1018         mutex_lock(&priv->lock);
1019
1020         if (local->flags & MEDIA_PAD_FL_SINK) {
1021                 if (!is_media_entity_v4l2_subdev(remote->entity)) {
1022                         ret = -EINVAL;
1023                         goto out;
1024                 }
1025
1026                 remote_sd = media_entity_to_v4l2_subdev(remote->entity);
1027
1028                 if (flags & MEDIA_LNK_FL_ENABLED) {
1029                         if (priv->src_sd) {
1030                                 ret = -EBUSY;
1031                                 goto out;
1032                         }
1033                         priv->src_sd = remote_sd;
1034                 } else {
1035                         priv->src_sd = NULL;
1036                 }
1037
1038                 goto out;
1039         }
1040
1041         /* this is a source pad */
1042
1043         if (flags & MEDIA_LNK_FL_ENABLED) {
1044                 if (priv->sink) {
1045                         ret = -EBUSY;
1046                         goto out;
1047                 }
1048         } else {
1049                 v4l2_ctrl_handler_free(&priv->ctrl_hdlr);
1050                 v4l2_ctrl_handler_init(&priv->ctrl_hdlr, 0);
1051                 priv->sink = NULL;
1052                 /* do not apply IC burst alignment in csi_try_crop */
1053                 priv->active_output_pad = CSI_SRC_PAD_IDMAC;
1054                 goto out;
1055         }
1056
1057         /* record which output pad is now active */
1058         priv->active_output_pad = local->index;
1059
1060         /* set CSI destination */
1061         if (local->index == CSI_SRC_PAD_IDMAC) {
1062                 if (!is_media_entity_v4l2_video_device(remote->entity)) {
1063                         ret = -EINVAL;
1064                         goto out;
1065                 }
1066
1067                 if (priv->fim) {
1068                         ret = imx_media_fim_add_controls(priv->fim);
1069                         if (ret)
1070                                 goto out;
1071                 }
1072
1073                 priv->dest = IPU_CSI_DEST_IDMAC;
1074         } else {
1075                 if (!is_media_entity_v4l2_subdev(remote->entity)) {
1076                         ret = -EINVAL;
1077                         goto out;
1078                 }
1079
1080                 remote_sd = media_entity_to_v4l2_subdev(remote->entity);
1081                 switch (remote_sd->grp_id) {
1082                 case IMX_MEDIA_GRP_ID_IPU_VDIC:
1083                         priv->dest = IPU_CSI_DEST_VDIC;
1084                         break;
1085                 case IMX_MEDIA_GRP_ID_IPU_IC_PRP:
1086                         priv->dest = IPU_CSI_DEST_IC;
1087                         break;
1088                 default:
1089                         ret = -EINVAL;
1090                         goto out;
1091                 }
1092         }
1093
1094         priv->sink = remote->entity;
1095 out:
1096         mutex_unlock(&priv->lock);
1097         return ret;
1098 }
1099
1100 static int csi_link_validate(struct v4l2_subdev *sd,
1101                              struct media_link *link,
1102                              struct v4l2_subdev_format *source_fmt,
1103                              struct v4l2_subdev_format *sink_fmt)
1104 {
1105         struct csi_priv *priv = v4l2_get_subdevdata(sd);
1106         struct v4l2_fwnode_endpoint upstream_ep = { .bus_type = 0 };
1107         bool is_csi2;
1108         int ret;
1109
1110         ret = v4l2_subdev_link_validate_default(sd, link,
1111                                                 source_fmt, sink_fmt);
1112         if (ret)
1113                 return ret;
1114
1115         ret = csi_get_upstream_endpoint(priv, &upstream_ep);
1116         if (ret) {
1117                 v4l2_err(&priv->sd, "failed to find upstream endpoint\n");
1118                 return ret;
1119         }
1120
1121         mutex_lock(&priv->lock);
1122
1123         priv->upstream_ep = upstream_ep;
1124         is_csi2 = !is_parallel_bus(&upstream_ep);
1125         if (is_csi2) {
1126                 int vc_num = 0;
1127                 /*
1128                  * NOTE! It seems the virtual channels from the mipi csi-2
1129                  * receiver are used only for routing by the video mux's,
1130                  * or for hard-wired routing to the CSI's. Once the stream
1131                  * enters the CSI's however, they are treated internally
1132                  * in the IPU as virtual channel 0.
1133                  */
1134 #if 0
1135                 mutex_unlock(&priv->lock);
1136                 vc_num = imx_media_find_mipi_csi2_channel(&priv->sd.entity);
1137                 if (vc_num < 0)
1138                         return vc_num;
1139                 mutex_lock(&priv->lock);
1140 #endif
1141                 ipu_csi_set_mipi_datatype(priv->csi, vc_num,
1142                                           &priv->format_mbus[CSI_SINK_PAD]);
1143         }
1144
1145         /* select either parallel or MIPI-CSI2 as input to CSI */
1146         ipu_set_csi_src_mux(priv->ipu, priv->csi_id, is_csi2);
1147
1148         mutex_unlock(&priv->lock);
1149         return ret;
1150 }
1151
1152 static struct v4l2_mbus_framefmt *
1153 __csi_get_fmt(struct csi_priv *priv, struct v4l2_subdev_pad_config *cfg,
1154               unsigned int pad, enum v4l2_subdev_format_whence which)
1155 {
1156         if (which == V4L2_SUBDEV_FORMAT_TRY)
1157                 return v4l2_subdev_get_try_format(&priv->sd, cfg, pad);
1158         else
1159                 return &priv->format_mbus[pad];
1160 }
1161
1162 static struct v4l2_rect *
1163 __csi_get_crop(struct csi_priv *priv, struct v4l2_subdev_pad_config *cfg,
1164                enum v4l2_subdev_format_whence which)
1165 {
1166         if (which == V4L2_SUBDEV_FORMAT_TRY)
1167                 return v4l2_subdev_get_try_crop(&priv->sd, cfg, CSI_SINK_PAD);
1168         else
1169                 return &priv->crop;
1170 }
1171
1172 static struct v4l2_rect *
1173 __csi_get_compose(struct csi_priv *priv, struct v4l2_subdev_pad_config *cfg,
1174                   enum v4l2_subdev_format_whence which)
1175 {
1176         if (which == V4L2_SUBDEV_FORMAT_TRY)
1177                 return v4l2_subdev_get_try_compose(&priv->sd, cfg,
1178                                                    CSI_SINK_PAD);
1179         else
1180                 return &priv->compose;
1181 }
1182
1183 static void csi_try_crop(struct csi_priv *priv,
1184                          struct v4l2_rect *crop,
1185                          struct v4l2_subdev_pad_config *cfg,
1186                          struct v4l2_mbus_framefmt *infmt,
1187                          struct v4l2_fwnode_endpoint *upstream_ep)
1188 {
1189         u32 in_height;
1190
1191         crop->width = min_t(__u32, infmt->width, crop->width);
1192         if (crop->left + crop->width > infmt->width)
1193                 crop->left = infmt->width - crop->width;
1194         /* adjust crop left/width to h/w alignment restrictions */
1195         crop->left &= ~0x3;
1196         if (priv->active_output_pad == CSI_SRC_PAD_DIRECT)
1197                 crop->width &= ~0x7; /* multiple of 8 pixels (IC burst) */
1198         else
1199                 crop->width &= ~0x1; /* multiple of 2 pixels */
1200
1201         in_height = infmt->height;
1202         if (infmt->field == V4L2_FIELD_ALTERNATE)
1203                 in_height *= 2;
1204
1205         /*
1206          * FIXME: not sure why yet, but on interlaced bt.656,
1207          * changing the vertical cropping causes loss of vertical
1208          * sync, so fix it to NTSC/PAL active lines. NTSC contains
1209          * 2 extra lines of active video that need to be cropped.
1210          */
1211         if (upstream_ep->bus_type == V4L2_MBUS_BT656 &&
1212             (V4L2_FIELD_HAS_BOTH(infmt->field) ||
1213              infmt->field == V4L2_FIELD_ALTERNATE)) {
1214                 crop->height = in_height;
1215                 crop->top = (in_height == 480) ? 2 : 0;
1216         } else {
1217                 crop->height = min_t(__u32, in_height, crop->height);
1218                 if (crop->top + crop->height > in_height)
1219                         crop->top = in_height - crop->height;
1220         }
1221 }
1222
1223 static int csi_enum_mbus_code(struct v4l2_subdev *sd,
1224                               struct v4l2_subdev_pad_config *cfg,
1225                               struct v4l2_subdev_mbus_code_enum *code)
1226 {
1227         struct csi_priv *priv = v4l2_get_subdevdata(sd);
1228         struct v4l2_fwnode_endpoint upstream_ep = { .bus_type = 0 };
1229         const struct imx_media_pixfmt *incc;
1230         struct v4l2_mbus_framefmt *infmt;
1231         int ret = 0;
1232
1233         mutex_lock(&priv->lock);
1234
1235         infmt = __csi_get_fmt(priv, cfg, CSI_SINK_PAD, code->which);
1236         incc = imx_media_find_mbus_format(infmt->code, PIXFMT_SEL_ANY);
1237
1238         switch (code->pad) {
1239         case CSI_SINK_PAD:
1240                 ret = imx_media_enum_mbus_formats(&code->code, code->index,
1241                                                   PIXFMT_SEL_ANY);
1242                 break;
1243         case CSI_SRC_PAD_DIRECT:
1244         case CSI_SRC_PAD_IDMAC:
1245                 ret = csi_get_upstream_endpoint(priv, &upstream_ep);
1246                 if (ret) {
1247                         v4l2_err(&priv->sd, "failed to find upstream endpoint\n");
1248                         goto out;
1249                 }
1250
1251                 if (requires_passthrough(&upstream_ep, infmt, incc)) {
1252                         if (code->index != 0) {
1253                                 ret = -EINVAL;
1254                                 goto out;
1255                         }
1256                         code->code = infmt->code;
1257                 } else {
1258                         enum imx_pixfmt_sel fmt_sel =
1259                                 (incc->cs == IPUV3_COLORSPACE_YUV) ?
1260                                 PIXFMT_SEL_YUV : PIXFMT_SEL_RGB;
1261
1262                         ret = imx_media_enum_ipu_formats(&code->code,
1263                                                          code->index,
1264                                                          fmt_sel);
1265                 }
1266                 break;
1267         default:
1268                 ret = -EINVAL;
1269         }
1270
1271 out:
1272         mutex_unlock(&priv->lock);
1273         return ret;
1274 }
1275
1276 static int csi_enum_frame_size(struct v4l2_subdev *sd,
1277                                struct v4l2_subdev_pad_config *cfg,
1278                                struct v4l2_subdev_frame_size_enum *fse)
1279 {
1280         struct csi_priv *priv = v4l2_get_subdevdata(sd);
1281         struct v4l2_rect *crop;
1282         int ret = 0;
1283
1284         if (fse->pad >= CSI_NUM_PADS ||
1285             fse->index > (fse->pad == CSI_SINK_PAD ? 0 : 3))
1286                 return -EINVAL;
1287
1288         mutex_lock(&priv->lock);
1289
1290         if (fse->pad == CSI_SINK_PAD) {
1291                 fse->min_width = MIN_W;
1292                 fse->max_width = MAX_W;
1293                 fse->min_height = MIN_H;
1294                 fse->max_height = MAX_H;
1295         } else {
1296                 crop = __csi_get_crop(priv, cfg, fse->which);
1297
1298                 fse->min_width = fse->index & 1 ?
1299                         crop->width / 2 : crop->width;
1300                 fse->max_width = fse->min_width;
1301                 fse->min_height = fse->index & 2 ?
1302                         crop->height / 2 : crop->height;
1303                 fse->max_height = fse->min_height;
1304         }
1305
1306         mutex_unlock(&priv->lock);
1307         return ret;
1308 }
1309
1310 static int csi_enum_frame_interval(struct v4l2_subdev *sd,
1311                                    struct v4l2_subdev_pad_config *cfg,
1312                                    struct v4l2_subdev_frame_interval_enum *fie)
1313 {
1314         struct csi_priv *priv = v4l2_get_subdevdata(sd);
1315         struct v4l2_fract *input_fi;
1316         struct v4l2_rect *crop;
1317         int ret = 0;
1318
1319         if (fie->pad >= CSI_NUM_PADS ||
1320             fie->index >= (fie->pad != CSI_SRC_PAD_IDMAC ?
1321                            1 : ARRAY_SIZE(csi_skip)))
1322                 return -EINVAL;
1323
1324         mutex_lock(&priv->lock);
1325
1326         input_fi = &priv->frame_interval[CSI_SINK_PAD];
1327         crop = __csi_get_crop(priv, cfg, fie->which);
1328
1329         if ((fie->width != crop->width && fie->width != crop->width / 2) ||
1330             (fie->height != crop->height && fie->height != crop->height / 2)) {
1331                 ret = -EINVAL;
1332                 goto out;
1333         }
1334
1335         fie->interval = *input_fi;
1336
1337         if (fie->pad == CSI_SRC_PAD_IDMAC)
1338                 csi_apply_skip_interval(&csi_skip[fie->index],
1339                                         &fie->interval);
1340
1341 out:
1342         mutex_unlock(&priv->lock);
1343         return ret;
1344 }
1345
1346 static int csi_get_fmt(struct v4l2_subdev *sd,
1347                        struct v4l2_subdev_pad_config *cfg,
1348                        struct v4l2_subdev_format *sdformat)
1349 {
1350         struct csi_priv *priv = v4l2_get_subdevdata(sd);
1351         struct v4l2_mbus_framefmt *fmt;
1352         int ret = 0;
1353
1354         if (sdformat->pad >= CSI_NUM_PADS)
1355                 return -EINVAL;
1356
1357         mutex_lock(&priv->lock);
1358
1359         fmt = __csi_get_fmt(priv, cfg, sdformat->pad, sdformat->which);
1360         if (!fmt) {
1361                 ret = -EINVAL;
1362                 goto out;
1363         }
1364
1365         sdformat->format = *fmt;
1366 out:
1367         mutex_unlock(&priv->lock);
1368         return ret;
1369 }
1370
1371 static void csi_try_field(struct csi_priv *priv,
1372                           struct v4l2_subdev_pad_config *cfg,
1373                           struct v4l2_subdev_format *sdformat)
1374 {
1375         struct v4l2_mbus_framefmt *infmt =
1376                 __csi_get_fmt(priv, cfg, CSI_SINK_PAD, sdformat->which);
1377
1378         /*
1379          * no restrictions on sink pad field type except must
1380          * be initialized.
1381          */
1382         if (sdformat->pad == CSI_SINK_PAD) {
1383                 if (sdformat->format.field == V4L2_FIELD_ANY)
1384                         sdformat->format.field = V4L2_FIELD_NONE;
1385                 return;
1386         }
1387
1388         switch (infmt->field) {
1389         case V4L2_FIELD_SEQ_TB:
1390         case V4L2_FIELD_SEQ_BT:
1391                 /*
1392                  * If the user requests sequential at the source pad,
1393                  * allow it (along with possibly inverting field order).
1394                  * Otherwise passthrough the field type.
1395                  */
1396                 if (!V4L2_FIELD_IS_SEQUENTIAL(sdformat->format.field))
1397                         sdformat->format.field = infmt->field;
1398                 break;
1399         case V4L2_FIELD_ALTERNATE:
1400                 /*
1401                  * This driver does not support alternate field mode, and
1402                  * the CSI captures a whole frame, so the CSI never presents
1403                  * alternate mode at its source pads. If user has not
1404                  * already requested sequential, translate ALTERNATE at
1405                  * sink pad to SEQ_TB or SEQ_BT at the source pad depending
1406                  * on input height (assume NTSC BT order if 480 total active
1407                  * frame lines, otherwise PAL TB order).
1408                  */
1409                 if (!V4L2_FIELD_IS_SEQUENTIAL(sdformat->format.field))
1410                         sdformat->format.field = (infmt->height == 480 / 2) ?
1411                                 V4L2_FIELD_SEQ_BT : V4L2_FIELD_SEQ_TB;
1412                 break;
1413         default:
1414                 /* Passthrough for all other input field types */
1415                 sdformat->format.field = infmt->field;
1416                 break;
1417         }
1418 }
1419
1420 static void csi_try_fmt(struct csi_priv *priv,
1421                         struct v4l2_fwnode_endpoint *upstream_ep,
1422                         struct v4l2_subdev_pad_config *cfg,
1423                         struct v4l2_subdev_format *sdformat,
1424                         struct v4l2_rect *crop,
1425                         struct v4l2_rect *compose,
1426                         const struct imx_media_pixfmt **cc)
1427 {
1428         const struct imx_media_pixfmt *incc;
1429         struct v4l2_mbus_framefmt *infmt;
1430         u32 code;
1431
1432         infmt = __csi_get_fmt(priv, cfg, CSI_SINK_PAD, sdformat->which);
1433
1434         switch (sdformat->pad) {
1435         case CSI_SRC_PAD_DIRECT:
1436         case CSI_SRC_PAD_IDMAC:
1437                 incc = imx_media_find_mbus_format(infmt->code, PIXFMT_SEL_ANY);
1438
1439                 sdformat->format.width = compose->width;
1440                 sdformat->format.height = compose->height;
1441
1442                 if (requires_passthrough(upstream_ep, infmt, incc)) {
1443                         sdformat->format.code = infmt->code;
1444                         *cc = incc;
1445                 } else {
1446                         enum imx_pixfmt_sel fmt_sel =
1447                                 (incc->cs == IPUV3_COLORSPACE_YUV) ?
1448                                 PIXFMT_SEL_YUV : PIXFMT_SEL_RGB;
1449
1450                         *cc = imx_media_find_ipu_format(sdformat->format.code,
1451                                                         fmt_sel);
1452                         if (!*cc) {
1453                                 imx_media_enum_ipu_formats(&code, 0, fmt_sel);
1454                                 *cc = imx_media_find_ipu_format(code, fmt_sel);
1455                                 sdformat->format.code = (*cc)->codes[0];
1456                         }
1457                 }
1458
1459                 csi_try_field(priv, cfg, sdformat);
1460
1461                 /* propagate colorimetry from sink */
1462                 sdformat->format.colorspace = infmt->colorspace;
1463                 sdformat->format.xfer_func = infmt->xfer_func;
1464                 sdformat->format.quantization = infmt->quantization;
1465                 sdformat->format.ycbcr_enc = infmt->ycbcr_enc;
1466
1467                 break;
1468         case CSI_SINK_PAD:
1469                 v4l_bound_align_image(&sdformat->format.width, MIN_W, MAX_W,
1470                                       W_ALIGN, &sdformat->format.height,
1471                                       MIN_H, MAX_H, H_ALIGN, S_ALIGN);
1472
1473                 *cc = imx_media_find_mbus_format(sdformat->format.code,
1474                                                  PIXFMT_SEL_ANY);
1475                 if (!*cc) {
1476                         imx_media_enum_mbus_formats(&code, 0,
1477                                                     PIXFMT_SEL_YUV_RGB);
1478                         *cc = imx_media_find_mbus_format(code,
1479                                                          PIXFMT_SEL_YUV_RGB);
1480                         sdformat->format.code = (*cc)->codes[0];
1481                 }
1482
1483                 csi_try_field(priv, cfg, sdformat);
1484
1485                 /* Reset crop and compose rectangles */
1486                 crop->left = 0;
1487                 crop->top = 0;
1488                 crop->width = sdformat->format.width;
1489                 crop->height = sdformat->format.height;
1490                 if (sdformat->format.field == V4L2_FIELD_ALTERNATE)
1491                         crop->height *= 2;
1492                 csi_try_crop(priv, crop, cfg, &sdformat->format, upstream_ep);
1493                 compose->left = 0;
1494                 compose->top = 0;
1495                 compose->width = crop->width;
1496                 compose->height = crop->height;
1497
1498                 break;
1499         }
1500
1501         imx_media_try_colorimetry(&sdformat->format,
1502                         priv->active_output_pad == CSI_SRC_PAD_DIRECT);
1503 }
1504
1505 static int csi_set_fmt(struct v4l2_subdev *sd,
1506                        struct v4l2_subdev_pad_config *cfg,
1507                        struct v4l2_subdev_format *sdformat)
1508 {
1509         struct csi_priv *priv = v4l2_get_subdevdata(sd);
1510         struct v4l2_fwnode_endpoint upstream_ep = { .bus_type = 0 };
1511         const struct imx_media_pixfmt *cc;
1512         struct v4l2_mbus_framefmt *fmt;
1513         struct v4l2_rect *crop, *compose;
1514         int ret;
1515
1516         if (sdformat->pad >= CSI_NUM_PADS)
1517                 return -EINVAL;
1518
1519         ret = csi_get_upstream_endpoint(priv, &upstream_ep);
1520         if (ret) {
1521                 v4l2_err(&priv->sd, "failed to find upstream endpoint\n");
1522                 return ret;
1523         }
1524
1525         mutex_lock(&priv->lock);
1526
1527         if (priv->stream_count > 0) {
1528                 ret = -EBUSY;
1529                 goto out;
1530         }
1531
1532         crop = __csi_get_crop(priv, cfg, sdformat->which);
1533         compose = __csi_get_compose(priv, cfg, sdformat->which);
1534
1535         csi_try_fmt(priv, &upstream_ep, cfg, sdformat, crop, compose, &cc);
1536
1537         fmt = __csi_get_fmt(priv, cfg, sdformat->pad, sdformat->which);
1538         *fmt = sdformat->format;
1539
1540         if (sdformat->pad == CSI_SINK_PAD) {
1541                 int pad;
1542
1543                 /* propagate format to source pads */
1544                 for (pad = CSI_SINK_PAD + 1; pad < CSI_NUM_PADS; pad++) {
1545                         const struct imx_media_pixfmt *outcc;
1546                         struct v4l2_mbus_framefmt *outfmt;
1547                         struct v4l2_subdev_format format;
1548
1549                         format.pad = pad;
1550                         format.which = sdformat->which;
1551                         format.format = sdformat->format;
1552                         csi_try_fmt(priv, &upstream_ep, cfg, &format,
1553                                     NULL, compose, &outcc);
1554
1555                         outfmt = __csi_get_fmt(priv, cfg, pad, sdformat->which);
1556                         *outfmt = format.format;
1557
1558                         if (sdformat->which == V4L2_SUBDEV_FORMAT_ACTIVE)
1559                                 priv->cc[pad] = outcc;
1560                 }
1561         }
1562
1563         if (sdformat->which == V4L2_SUBDEV_FORMAT_ACTIVE)
1564                 priv->cc[sdformat->pad] = cc;
1565
1566 out:
1567         mutex_unlock(&priv->lock);
1568         return ret;
1569 }
1570
1571 static int csi_get_selection(struct v4l2_subdev *sd,
1572                              struct v4l2_subdev_pad_config *cfg,
1573                              struct v4l2_subdev_selection *sel)
1574 {
1575         struct csi_priv *priv = v4l2_get_subdevdata(sd);
1576         struct v4l2_mbus_framefmt *infmt;
1577         struct v4l2_rect *crop, *compose;
1578         int ret = 0;
1579
1580         if (sel->pad != CSI_SINK_PAD)
1581                 return -EINVAL;
1582
1583         mutex_lock(&priv->lock);
1584
1585         infmt = __csi_get_fmt(priv, cfg, CSI_SINK_PAD, sel->which);
1586         crop = __csi_get_crop(priv, cfg, sel->which);
1587         compose = __csi_get_compose(priv, cfg, sel->which);
1588
1589         switch (sel->target) {
1590         case V4L2_SEL_TGT_CROP_BOUNDS:
1591                 sel->r.left = 0;
1592                 sel->r.top = 0;
1593                 sel->r.width = infmt->width;
1594                 sel->r.height = infmt->height;
1595                 if (infmt->field == V4L2_FIELD_ALTERNATE)
1596                         sel->r.height *= 2;
1597                 break;
1598         case V4L2_SEL_TGT_CROP:
1599                 sel->r = *crop;
1600                 break;
1601         case V4L2_SEL_TGT_COMPOSE_BOUNDS:
1602                 sel->r.left = 0;
1603                 sel->r.top = 0;
1604                 sel->r.width = crop->width;
1605                 sel->r.height = crop->height;
1606                 break;
1607         case V4L2_SEL_TGT_COMPOSE:
1608                 sel->r = *compose;
1609                 break;
1610         default:
1611                 ret = -EINVAL;
1612         }
1613
1614         mutex_unlock(&priv->lock);
1615         return ret;
1616 }
1617
1618 static int csi_set_scale(u32 *compose, u32 crop, u32 flags)
1619 {
1620         if ((flags & (V4L2_SEL_FLAG_LE | V4L2_SEL_FLAG_GE)) ==
1621                      (V4L2_SEL_FLAG_LE | V4L2_SEL_FLAG_GE) &&
1622             *compose != crop && *compose != crop / 2)
1623                 return -ERANGE;
1624
1625         if (*compose <= crop / 2 ||
1626             (*compose < crop * 3 / 4 && !(flags & V4L2_SEL_FLAG_GE)) ||
1627             (*compose < crop && (flags & V4L2_SEL_FLAG_LE)))
1628                 *compose = crop / 2;
1629         else
1630                 *compose = crop;
1631
1632         return 0;
1633 }
1634
1635 static int csi_set_selection(struct v4l2_subdev *sd,
1636                              struct v4l2_subdev_pad_config *cfg,
1637                              struct v4l2_subdev_selection *sel)
1638 {
1639         struct csi_priv *priv = v4l2_get_subdevdata(sd);
1640         struct v4l2_fwnode_endpoint upstream_ep = { .bus_type = 0 };
1641         struct v4l2_mbus_framefmt *infmt;
1642         struct v4l2_rect *crop, *compose;
1643         int pad, ret;
1644
1645         if (sel->pad != CSI_SINK_PAD)
1646                 return -EINVAL;
1647
1648         ret = csi_get_upstream_endpoint(priv, &upstream_ep);
1649         if (ret) {
1650                 v4l2_err(&priv->sd, "failed to find upstream endpoint\n");
1651                 return ret;
1652         }
1653
1654         mutex_lock(&priv->lock);
1655
1656         if (priv->stream_count > 0) {
1657                 ret = -EBUSY;
1658                 goto out;
1659         }
1660
1661         infmt = __csi_get_fmt(priv, cfg, CSI_SINK_PAD, sel->which);
1662         crop = __csi_get_crop(priv, cfg, sel->which);
1663         compose = __csi_get_compose(priv, cfg, sel->which);
1664
1665         switch (sel->target) {
1666         case V4L2_SEL_TGT_CROP:
1667                 /*
1668                  * Modifying the crop rectangle always changes the format on
1669                  * the source pads. If the KEEP_CONFIG flag is set, just return
1670                  * the current crop rectangle.
1671                  */
1672                 if (sel->flags & V4L2_SEL_FLAG_KEEP_CONFIG) {
1673                         sel->r = priv->crop;
1674                         if (sel->which == V4L2_SUBDEV_FORMAT_TRY)
1675                                 *crop = sel->r;
1676                         goto out;
1677                 }
1678
1679                 csi_try_crop(priv, &sel->r, cfg, infmt, &upstream_ep);
1680
1681                 *crop = sel->r;
1682
1683                 /* Reset scaling to 1:1 */
1684                 compose->width = crop->width;
1685                 compose->height = crop->height;
1686                 break;
1687         case V4L2_SEL_TGT_COMPOSE:
1688                 /*
1689                  * Modifying the compose rectangle always changes the format on
1690                  * the source pads. If the KEEP_CONFIG flag is set, just return
1691                  * the current compose rectangle.
1692                  */
1693                 if (sel->flags & V4L2_SEL_FLAG_KEEP_CONFIG) {
1694                         sel->r = priv->compose;
1695                         if (sel->which == V4L2_SUBDEV_FORMAT_TRY)
1696                                 *compose = sel->r;
1697                         goto out;
1698                 }
1699
1700                 sel->r.left = 0;
1701                 sel->r.top = 0;
1702                 ret = csi_set_scale(&sel->r.width, crop->width, sel->flags);
1703                 if (ret)
1704                         goto out;
1705                 ret = csi_set_scale(&sel->r.height, crop->height, sel->flags);
1706                 if (ret)
1707                         goto out;
1708
1709                 *compose = sel->r;
1710                 break;
1711         default:
1712                 ret = -EINVAL;
1713                 goto out;
1714         }
1715
1716         /* Reset source pads to sink compose rectangle */
1717         for (pad = CSI_SINK_PAD + 1; pad < CSI_NUM_PADS; pad++) {
1718                 struct v4l2_mbus_framefmt *outfmt;
1719
1720                 outfmt = __csi_get_fmt(priv, cfg, pad, sel->which);
1721                 outfmt->width = compose->width;
1722                 outfmt->height = compose->height;
1723         }
1724
1725 out:
1726         mutex_unlock(&priv->lock);
1727         return ret;
1728 }
1729
1730 static int csi_subscribe_event(struct v4l2_subdev *sd, struct v4l2_fh *fh,
1731                                struct v4l2_event_subscription *sub)
1732 {
1733         if (sub->type != V4L2_EVENT_IMX_FRAME_INTERVAL_ERROR)
1734                 return -EINVAL;
1735         if (sub->id != 0)
1736                 return -EINVAL;
1737
1738         return v4l2_event_subscribe(fh, sub, 0, NULL);
1739 }
1740
1741 static int csi_unsubscribe_event(struct v4l2_subdev *sd, struct v4l2_fh *fh,
1742                                  struct v4l2_event_subscription *sub)
1743 {
1744         return v4l2_event_unsubscribe(fh, sub);
1745 }
1746
1747 static int csi_registered(struct v4l2_subdev *sd)
1748 {
1749         struct csi_priv *priv = v4l2_get_subdevdata(sd);
1750         struct ipu_csi *csi;
1751         int i, ret;
1752         u32 code;
1753
1754         /* get handle to IPU CSI */
1755         csi = ipu_csi_get(priv->ipu, priv->csi_id);
1756         if (IS_ERR(csi)) {
1757                 v4l2_err(&priv->sd, "failed to get CSI%d\n", priv->csi_id);
1758                 return PTR_ERR(csi);
1759         }
1760         priv->csi = csi;
1761
1762         for (i = 0; i < CSI_NUM_PADS; i++) {
1763                 code = 0;
1764                 if (i != CSI_SINK_PAD)
1765                         imx_media_enum_ipu_formats(&code, 0, PIXFMT_SEL_YUV);
1766
1767                 /* set a default mbus format  */
1768                 ret = imx_media_init_mbus_fmt(&priv->format_mbus[i],
1769                                               640, 480, code, V4L2_FIELD_NONE,
1770                                               &priv->cc[i]);
1771                 if (ret)
1772                         goto put_csi;
1773
1774                 /* init default frame interval */
1775                 priv->frame_interval[i].numerator = 1;
1776                 priv->frame_interval[i].denominator = 30;
1777         }
1778
1779         /* disable frame skipping */
1780         priv->skip = &csi_skip[0];
1781
1782         /* init default crop and compose rectangle sizes */
1783         priv->crop.width = 640;
1784         priv->crop.height = 480;
1785         priv->compose.width = 640;
1786         priv->compose.height = 480;
1787
1788         priv->fim = imx_media_fim_init(&priv->sd);
1789         if (IS_ERR(priv->fim)) {
1790                 ret = PTR_ERR(priv->fim);
1791                 goto put_csi;
1792         }
1793
1794         priv->vdev = imx_media_capture_device_init(priv->sd.dev,
1795                                                    &priv->sd,
1796                                                    CSI_SRC_PAD_IDMAC);
1797         if (IS_ERR(priv->vdev)) {
1798                 ret = PTR_ERR(priv->vdev);
1799                 goto free_fim;
1800         }
1801
1802         ret = imx_media_capture_device_register(priv->vdev);
1803         if (ret)
1804                 goto remove_vdev;
1805
1806         return 0;
1807
1808 remove_vdev:
1809         imx_media_capture_device_remove(priv->vdev);
1810 free_fim:
1811         if (priv->fim)
1812                 imx_media_fim_free(priv->fim);
1813 put_csi:
1814         ipu_csi_put(priv->csi);
1815         return ret;
1816 }
1817
1818 static void csi_unregistered(struct v4l2_subdev *sd)
1819 {
1820         struct csi_priv *priv = v4l2_get_subdevdata(sd);
1821
1822         imx_media_capture_device_unregister(priv->vdev);
1823         imx_media_capture_device_remove(priv->vdev);
1824
1825         if (priv->fim)
1826                 imx_media_fim_free(priv->fim);
1827
1828         if (priv->csi)
1829                 ipu_csi_put(priv->csi);
1830 }
1831
1832 /*
1833  * The CSI has only one fwnode endpoint, at the sink pad. Verify the
1834  * endpoint belongs to us, and return CSI_SINK_PAD.
1835  */
1836 static int csi_get_fwnode_pad(struct media_entity *entity,
1837                               struct fwnode_endpoint *endpoint)
1838 {
1839         struct v4l2_subdev *sd = media_entity_to_v4l2_subdev(entity);
1840         struct csi_priv *priv = v4l2_get_subdevdata(sd);
1841         struct fwnode_handle *csi_port = dev_fwnode(priv->dev);
1842         struct fwnode_handle *csi_ep;
1843         int ret;
1844
1845         csi_ep = fwnode_get_next_child_node(csi_port, NULL);
1846
1847         ret = endpoint->local_fwnode == csi_ep ? CSI_SINK_PAD : -ENXIO;
1848
1849         fwnode_handle_put(csi_ep);
1850
1851         return ret;
1852 }
1853
1854 static const struct media_entity_operations csi_entity_ops = {
1855         .link_setup = csi_link_setup,
1856         .link_validate = v4l2_subdev_link_validate,
1857         .get_fwnode_pad = csi_get_fwnode_pad,
1858 };
1859
1860 static const struct v4l2_subdev_core_ops csi_core_ops = {
1861         .subscribe_event = csi_subscribe_event,
1862         .unsubscribe_event = csi_unsubscribe_event,
1863 };
1864
1865 static const struct v4l2_subdev_video_ops csi_video_ops = {
1866         .g_frame_interval = csi_g_frame_interval,
1867         .s_frame_interval = csi_s_frame_interval,
1868         .s_stream = csi_s_stream,
1869 };
1870
1871 static const struct v4l2_subdev_pad_ops csi_pad_ops = {
1872         .init_cfg = imx_media_init_cfg,
1873         .enum_mbus_code = csi_enum_mbus_code,
1874         .enum_frame_size = csi_enum_frame_size,
1875         .enum_frame_interval = csi_enum_frame_interval,
1876         .get_fmt = csi_get_fmt,
1877         .set_fmt = csi_set_fmt,
1878         .get_selection = csi_get_selection,
1879         .set_selection = csi_set_selection,
1880         .link_validate = csi_link_validate,
1881 };
1882
1883 static const struct v4l2_subdev_ops csi_subdev_ops = {
1884         .core = &csi_core_ops,
1885         .video = &csi_video_ops,
1886         .pad = &csi_pad_ops,
1887 };
1888
1889 static const struct v4l2_subdev_internal_ops csi_internal_ops = {
1890         .registered = csi_registered,
1891         .unregistered = csi_unregistered,
1892 };
1893
1894 static int imx_csi_notify_bound(struct v4l2_async_notifier *notifier,
1895                                 struct v4l2_subdev *sd,
1896                                 struct v4l2_async_subdev *asd)
1897 {
1898         struct csi_priv *priv = notifier_to_dev(notifier);
1899         struct media_pad *sink = &priv->sd.entity.pads[CSI_SINK_PAD];
1900
1901         /*
1902          * If the subdev is a video mux, it must be one of the CSI
1903          * muxes. Mark it as such via its group id.
1904          */
1905         if (sd->entity.function == MEDIA_ENT_F_VID_MUX)
1906                 sd->grp_id = IMX_MEDIA_GRP_ID_CSI_MUX;
1907
1908         return v4l2_create_fwnode_links_to_pad(sd, sink);
1909 }
1910
1911 static const struct v4l2_async_notifier_operations csi_notify_ops = {
1912         .bound = imx_csi_notify_bound,
1913 };
1914
1915 static int imx_csi_async_register(struct csi_priv *priv)
1916 {
1917         struct v4l2_async_subdev *asd = NULL;
1918         struct fwnode_handle *ep;
1919         unsigned int port;
1920         int ret;
1921
1922         v4l2_async_notifier_init(&priv->notifier);
1923
1924         /* get this CSI's port id */
1925         ret = fwnode_property_read_u32(dev_fwnode(priv->dev), "reg", &port);
1926         if (ret < 0)
1927                 return ret;
1928
1929         ep = fwnode_graph_get_endpoint_by_id(dev_fwnode(priv->dev->parent),
1930                                              port, 0,
1931                                              FWNODE_GRAPH_ENDPOINT_NEXT);
1932         if (ep) {
1933                 asd = kzalloc(sizeof(*asd), GFP_KERNEL);
1934                 if (!asd) {
1935                         fwnode_handle_put(ep);
1936                         return -ENOMEM;
1937                 }
1938
1939                 ret = v4l2_async_notifier_add_fwnode_remote_subdev(
1940                         &priv->notifier, ep, asd);
1941
1942                 fwnode_handle_put(ep);
1943
1944                 if (ret) {
1945                         kfree(asd);
1946                         /* OK if asd already exists */
1947                         if (ret != -EEXIST)
1948                                 return ret;
1949                 }
1950         }
1951
1952         priv->notifier.ops = &csi_notify_ops;
1953
1954         ret = v4l2_async_subdev_notifier_register(&priv->sd,
1955                                                   &priv->notifier);
1956         if (ret)
1957                 return ret;
1958
1959         return v4l2_async_register_subdev(&priv->sd);
1960 }
1961
1962 static int imx_csi_probe(struct platform_device *pdev)
1963 {
1964         struct ipu_client_platformdata *pdata;
1965         struct pinctrl *pinctrl;
1966         struct csi_priv *priv;
1967         int i, ret;
1968
1969         priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL);
1970         if (!priv)
1971                 return -ENOMEM;
1972
1973         platform_set_drvdata(pdev, &priv->sd);
1974         priv->dev = &pdev->dev;
1975
1976         ret = dma_set_coherent_mask(priv->dev, DMA_BIT_MASK(32));
1977         if (ret)
1978                 return ret;
1979
1980         /* get parent IPU */
1981         priv->ipu = dev_get_drvdata(priv->dev->parent);
1982
1983         /* get our CSI id */
1984         pdata = priv->dev->platform_data;
1985         priv->csi_id = pdata->csi;
1986         priv->smfc_id = (priv->csi_id == 0) ? 0 : 2;
1987
1988         priv->active_output_pad = CSI_SRC_PAD_IDMAC;
1989
1990         timer_setup(&priv->eof_timeout_timer, csi_idmac_eof_timeout, 0);
1991         spin_lock_init(&priv->irqlock);
1992
1993         v4l2_subdev_init(&priv->sd, &csi_subdev_ops);
1994         v4l2_set_subdevdata(&priv->sd, priv);
1995         priv->sd.internal_ops = &csi_internal_ops;
1996         priv->sd.entity.ops = &csi_entity_ops;
1997         priv->sd.entity.function = MEDIA_ENT_F_PROC_VIDEO_PIXEL_FORMATTER;
1998         priv->sd.dev = &pdev->dev;
1999         priv->sd.fwnode = of_fwnode_handle(pdata->of_node);
2000         priv->sd.owner = THIS_MODULE;
2001         priv->sd.flags = V4L2_SUBDEV_FL_HAS_DEVNODE | V4L2_SUBDEV_FL_HAS_EVENTS;
2002         priv->sd.grp_id = priv->csi_id ?
2003                 IMX_MEDIA_GRP_ID_IPU_CSI1 : IMX_MEDIA_GRP_ID_IPU_CSI0;
2004         imx_media_grp_id_to_sd_name(priv->sd.name, sizeof(priv->sd.name),
2005                                     priv->sd.grp_id, ipu_get_num(priv->ipu));
2006
2007         for (i = 0; i < CSI_NUM_PADS; i++)
2008                 priv->pad[i].flags = (i == CSI_SINK_PAD) ?
2009                         MEDIA_PAD_FL_SINK : MEDIA_PAD_FL_SOURCE;
2010
2011         ret = media_entity_pads_init(&priv->sd.entity, CSI_NUM_PADS,
2012                                      priv->pad);
2013         if (ret)
2014                 return ret;
2015
2016         mutex_init(&priv->lock);
2017
2018         v4l2_ctrl_handler_init(&priv->ctrl_hdlr, 0);
2019         priv->sd.ctrl_handler = &priv->ctrl_hdlr;
2020
2021         /*
2022          * The IPUv3 driver did not assign an of_node to this
2023          * device. As a result, pinctrl does not automatically
2024          * configure our pin groups, so we need to do that manually
2025          * here, after setting this device's of_node.
2026          */
2027         priv->dev->of_node = pdata->of_node;
2028         pinctrl = devm_pinctrl_get_select_default(priv->dev);
2029         if (IS_ERR(pinctrl)) {
2030                 ret = PTR_ERR(pinctrl);
2031                 dev_dbg(priv->dev,
2032                         "devm_pinctrl_get_select_default() failed: %d\n", ret);
2033                 if (ret != -ENODEV)
2034                         goto free;
2035         }
2036
2037         ret = imx_csi_async_register(priv);
2038         if (ret)
2039                 goto cleanup;
2040
2041         return 0;
2042
2043 cleanup:
2044         v4l2_async_notifier_unregister(&priv->notifier);
2045         v4l2_async_notifier_cleanup(&priv->notifier);
2046 free:
2047         v4l2_ctrl_handler_free(&priv->ctrl_hdlr);
2048         mutex_destroy(&priv->lock);
2049         return ret;
2050 }
2051
2052 static int imx_csi_remove(struct platform_device *pdev)
2053 {
2054         struct v4l2_subdev *sd = platform_get_drvdata(pdev);
2055         struct csi_priv *priv = sd_to_dev(sd);
2056
2057         v4l2_ctrl_handler_free(&priv->ctrl_hdlr);
2058         mutex_destroy(&priv->lock);
2059         v4l2_async_notifier_unregister(&priv->notifier);
2060         v4l2_async_notifier_cleanup(&priv->notifier);
2061         v4l2_async_unregister_subdev(sd);
2062         media_entity_cleanup(&sd->entity);
2063
2064         return 0;
2065 }
2066
2067 static const struct platform_device_id imx_csi_ids[] = {
2068         { .name = "imx-ipuv3-csi" },
2069         { },
2070 };
2071 MODULE_DEVICE_TABLE(platform, imx_csi_ids);
2072
2073 static struct platform_driver imx_csi_driver = {
2074         .probe = imx_csi_probe,
2075         .remove = imx_csi_remove,
2076         .id_table = imx_csi_ids,
2077         .driver = {
2078                 .name = "imx-ipuv3-csi",
2079         },
2080 };
2081 module_platform_driver(imx_csi_driver);
2082
2083 MODULE_DESCRIPTION("i.MX CSI subdev driver");
2084 MODULE_AUTHOR("Steve Longerbeam <steve_longerbeam@mentor.com>");
2085 MODULE_LICENSE("GPL");
2086 MODULE_ALIAS("platform:imx-ipuv3-csi");