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         /* media bus config of the upstream subdevice CSI is receiving from */
 101         struct v4l2_mbus_config mbus_cfg;
 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_mbus_config *mbus_cfg)
 129 {
 130         return mbus_cfg->type != V4L2_MBUS_CSI2_DPHY;
 131 }
 132
 133 static inline bool is_parallel_16bit_bus(struct v4l2_mbus_config *mbus_cfg)
 134 {
 135         return is_parallel_bus(mbus_cfg) && mbus_cfg->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  * - BT.656 and BT.1120 (8/10-bit YUV422) data can always be processed
 143  *   on-the-fly
 144  * - the CSI is receiving from a 16-bit parallel bus, or
 145  * - the CSI is receiving from an 8-bit parallel bus and the incoming
 146  *   media bus format is other than UYVY8_2X8/YUYV8_2X8.
 147  */
 148 static inline bool requires_passthrough(struct v4l2_mbus_config *mbus_cfg,
 149                                         struct v4l2_mbus_framefmt *infmt,
 150                                         const struct imx_media_pixfmt *incc)
 151 {
 152         if (mbus_cfg->type == V4L2_MBUS_BT656) // including BT.1120
 153                 return false;
 154
 155         return incc->bayer || is_parallel_16bit_bus(mbus_cfg) ||
 156                 (is_parallel_bus(mbus_cfg) &&
 157                  infmt->code != MEDIA_BUS_FMT_UYVY8_2X8 &&
 158                  infmt->code != MEDIA_BUS_FMT_YUYV8_2X8);
 159 }
 160
 161 /*
 162  * Queries the media bus config of the upstream entity that provides data to
 163  * the CSI. This will either be the entity directly upstream from the CSI-2
 164  * receiver, directly upstream from a video mux, or directly upstream from
 165  * the CSI itself.
 166  */
 167 static int csi_get_upstream_mbus_config(struct csi_priv *priv,
 168                                         struct v4l2_mbus_config *mbus_cfg)
 169 {
 170         struct v4l2_subdev *sd, *remote_sd;
 171         struct media_pad *remote_pad;
 172         int ret;
 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         remote_pad = media_entity_remote_pad_unique(&sd->entity,
 205                                                     MEDIA_PAD_FL_SOURCE);
 206         if (IS_ERR(remote_pad))
 207                 return PTR_ERR(remote_pad);
 208
 209         remote_sd = media_entity_to_v4l2_subdev(remote_pad->entity);
 210
 211         ret = v4l2_subdev_call(remote_sd, pad, get_mbus_config,
 212                                remote_pad->index, mbus_cfg);
 213         if (ret == -ENOIOCTLCMD)
 214                 v4l2_err(&priv->sd,
 215                          "entity %s does not implement get_mbus_config()\n",
 216                          remote_pad->entity->name);
 217
 218         return ret;
 219 }
 220
 221 static void csi_idmac_put_ipu_resources(struct csi_priv *priv)
 222 {
 223         if (priv->idmac_ch)
 224                 ipu_idmac_put(priv->idmac_ch);
 225         priv->idmac_ch = NULL;
 226
 227         if (priv->smfc)
 228                 ipu_smfc_put(priv->smfc);
 229         priv->smfc = NULL;
 230 }
 231
 232 static int csi_idmac_get_ipu_resources(struct csi_priv *priv)
 233 {
 234         int ch_num, ret;
 235         struct ipu_smfc *smfc;
 236         struct ipuv3_channel *idmac_ch;
 237
 238         ch_num = IPUV3_CHANNEL_CSI0 + priv->smfc_id;
 239
 240         smfc = ipu_smfc_get(priv->ipu, ch_num);
 241         if (IS_ERR(smfc)) {
 242                 v4l2_err(&priv->sd, "failed to get SMFC\n");
 243                 ret = PTR_ERR(smfc);
 244                 goto out;
 245         }
 246         priv->smfc = smfc;
 247
 248         idmac_ch = ipu_idmac_get(priv->ipu, ch_num);
 249         if (IS_ERR(idmac_ch)) {
 250                 v4l2_err(&priv->sd, "could not get IDMAC channel %u\n",
 251                          ch_num);
 252                 ret = PTR_ERR(idmac_ch);
 253                 goto out;
 254         }
 255         priv->idmac_ch = idmac_ch;
 256
 257         return 0;
 258 out:
 259         csi_idmac_put_ipu_resources(priv);
 260         return ret;
 261 }
 262
 263 static void csi_vb2_buf_done(struct csi_priv *priv)
 264 {
 265         struct imx_media_video_dev *vdev = priv->vdev;
 266         struct imx_media_buffer *done, *next;
 267         struct vb2_buffer *vb;
 268         dma_addr_t phys;
 269
 270         done = priv->active_vb2_buf[priv->ipu_buf_num];
 271         if (done) {
 272                 done->vbuf.field = vdev->fmt.field;
 273                 done->vbuf.sequence = priv->frame_sequence;
 274                 vb = &done->vbuf.vb2_buf;
 275                 vb->timestamp = ktime_get_ns();
 276                 vb2_buffer_done(vb, priv->nfb4eof ?
 277                                 VB2_BUF_STATE_ERROR : VB2_BUF_STATE_DONE);
 278         }
 279
 280         priv->frame_sequence++;
 281         priv->nfb4eof = false;
 282
 283         /* get next queued buffer */
 284         next = imx_media_capture_device_next_buf(vdev);
 285         if (next) {
 286                 phys = vb2_dma_contig_plane_dma_addr(&next->vbuf.vb2_buf, 0);
 287                 priv->active_vb2_buf[priv->ipu_buf_num] = next;
 288         } else {
 289                 phys = priv->underrun_buf.phys;
 290                 priv->active_vb2_buf[priv->ipu_buf_num] = NULL;
 291         }
 292
 293         if (ipu_idmac_buffer_is_ready(priv->idmac_ch, priv->ipu_buf_num))
 294                 ipu_idmac_clear_buffer(priv->idmac_ch, priv->ipu_buf_num);
 295
 296         if (priv->interweave_swap)
 297                 phys += vdev->fmt.bytesperline;
 298
 299         ipu_cpmem_set_buffer(priv->idmac_ch, priv->ipu_buf_num, phys);
 300 }
 301
 302 static irqreturn_t csi_idmac_eof_interrupt(int irq, void *dev_id)
 303 {
 304         struct csi_priv *priv = dev_id;
 305
 306         spin_lock(&priv->irqlock);
 307
 308         if (priv->last_eof) {
 309                 complete(&priv->last_eof_comp);
 310                 priv->last_eof = false;
 311                 goto unlock;
 312         }
 313
 314         if (priv->fim)
 315                 /* call frame interval monitor */
 316                 imx_media_fim_eof_monitor(priv->fim, ktime_get());
 317
 318         csi_vb2_buf_done(priv);
 319
 320         /* select new IPU buf */
 321         ipu_idmac_select_buffer(priv->idmac_ch, priv->ipu_buf_num);
 322         /* toggle IPU double-buffer index */
 323         priv->ipu_buf_num ^= 1;
 324
 325         /* bump the EOF timeout timer */
 326         mod_timer(&priv->eof_timeout_timer,
 327                   jiffies + msecs_to_jiffies(IMX_MEDIA_EOF_TIMEOUT));
 328
 329 unlock:
 330         spin_unlock(&priv->irqlock);
 331         return IRQ_HANDLED;
 332 }
 333
 334 static irqreturn_t csi_idmac_nfb4eof_interrupt(int irq, void *dev_id)
 335 {
 336         struct csi_priv *priv = dev_id;
 337
 338         spin_lock(&priv->irqlock);
 339
 340         /*
 341          * this is not an unrecoverable error, just mark
 342          * the next captured frame with vb2 error flag.
 343          */
 344         priv->nfb4eof = true;
 345
 346         v4l2_err(&priv->sd, "NFB4EOF\n");
 347
 348         spin_unlock(&priv->irqlock);
 349
 350         return IRQ_HANDLED;
 351 }
 352
 353 /*
 354  * EOF timeout timer function. This is an unrecoverable condition
 355  * without a stream restart.
 356  */
 357 static void csi_idmac_eof_timeout(struct timer_list *t)
 358 {
 359         struct csi_priv *priv = from_timer(priv, t, eof_timeout_timer);
 360         struct imx_media_video_dev *vdev = priv->vdev;
 361
 362         v4l2_err(&priv->sd, "EOF timeout\n");
 363
 364         /* signal a fatal error to capture device */
 365         imx_media_capture_device_error(vdev);
 366 }
 367
 368 static void csi_idmac_setup_vb2_buf(struct csi_priv *priv, dma_addr_t *phys)
 369 {
 370         struct imx_media_video_dev *vdev = priv->vdev;
 371         struct imx_media_buffer *buf;
 372         int i;
 373
 374         for (i = 0; i < 2; i++) {
 375                 buf = imx_media_capture_device_next_buf(vdev);
 376                 if (buf) {
 377                         priv->active_vb2_buf[i] = buf;
 378                         phys[i] = vb2_dma_contig_plane_dma_addr(
 379                                 &buf->vbuf.vb2_buf, 0);
 380                 } else {
 381                         priv->active_vb2_buf[i] = NULL;
 382                         phys[i] = priv->underrun_buf.phys;
 383                 }
 384         }
 385 }
 386
 387 static void csi_idmac_unsetup_vb2_buf(struct csi_priv *priv,
 388                                       enum vb2_buffer_state return_status)
 389 {
 390         struct imx_media_buffer *buf;
 391         int i;
 392
 393         /* return any remaining active frames with return_status */
 394         for (i = 0; i < 2; i++) {
 395                 buf = priv->active_vb2_buf[i];
 396                 if (buf) {
 397                         struct vb2_buffer *vb = &buf->vbuf.vb2_buf;
 398
 399                         vb->timestamp = ktime_get_ns();
 400                         vb2_buffer_done(vb, return_status);
 401                 }
 402         }
 403 }
 404
 405 /* init the SMFC IDMAC channel */
 406 static int csi_idmac_setup_channel(struct csi_priv *priv)
 407 {
 408         struct imx_media_video_dev *vdev = priv->vdev;
 409         const struct imx_media_pixfmt *incc;
 410         struct v4l2_mbus_framefmt *infmt;
 411         struct v4l2_mbus_framefmt *outfmt;
 412         bool passthrough, interweave;
 413         struct ipu_image image;
 414         u32 passthrough_bits;
 415         u32 passthrough_cycles;
 416         dma_addr_t phys[2];
 417         u32 burst_size;
 418         int ret;
 419
 420         infmt = &priv->format_mbus[CSI_SINK_PAD];
 421         incc = priv->cc[CSI_SINK_PAD];
 422         outfmt = &priv->format_mbus[CSI_SRC_PAD_IDMAC];
 423
 424         ipu_cpmem_zero(priv->idmac_ch);
 425
 426         memset(&image, 0, sizeof(image));
 427         image.pix = vdev->fmt;
 428         image.rect = vdev->compose;
 429
 430         csi_idmac_setup_vb2_buf(priv, phys);
 431
 432         image.phys0 = phys[0];
 433         image.phys1 = phys[1];
 434
 435         passthrough = requires_passthrough(&priv->mbus_cfg, infmt, incc);
 436         passthrough_cycles = 1;
 437
 438         /*
 439          * If the field type at capture interface is interlaced, and
 440          * the output IDMAC pad is sequential, enable interweave at
 441          * the IDMAC output channel.
 442          */
 443         interweave = V4L2_FIELD_IS_INTERLACED(image.pix.field) &&
 444                 V4L2_FIELD_IS_SEQUENTIAL(outfmt->field);
 445         priv->interweave_swap = interweave &&
 446                 image.pix.field == V4L2_FIELD_INTERLACED_BT;
 447
 448         switch (image.pix.pixelformat) {
 449         case V4L2_PIX_FMT_SBGGR8:
 450         case V4L2_PIX_FMT_SGBRG8:
 451         case V4L2_PIX_FMT_SGRBG8:
 452         case V4L2_PIX_FMT_SRGGB8:
 453         case V4L2_PIX_FMT_GREY:
 454                 burst_size = 16;
 455                 passthrough_bits = 8;
 456                 break;
 457         case V4L2_PIX_FMT_SBGGR16:
 458         case V4L2_PIX_FMT_SGBRG16:
 459         case V4L2_PIX_FMT_SGRBG16:
 460         case V4L2_PIX_FMT_SRGGB16:
 461         case V4L2_PIX_FMT_Y10:
 462         case V4L2_PIX_FMT_Y12:
 463                 burst_size = 8;
 464                 passthrough_bits = 16;
 465                 break;
 466         case V4L2_PIX_FMT_YUV420:
 467         case V4L2_PIX_FMT_YVU420:
 468         case V4L2_PIX_FMT_NV12:
 469                 burst_size = (image.pix.width & 0x3f) ?
 470                              ((image.pix.width & 0x1f) ?
 471                               ((image.pix.width & 0xf) ? 8 : 16) : 32) : 64;
 472                 passthrough_bits = 16;
 473                 /*
 474                  * Skip writing U and V components to odd rows (but not
 475                  * when enabling IDMAC interweaving, they are incompatible).
 476                  */
 477                 if (!interweave)
 478                         ipu_cpmem_skip_odd_chroma_rows(priv->idmac_ch);
 479                 break;
 480         case V4L2_PIX_FMT_YUYV:
 481         case V4L2_PIX_FMT_UYVY:
 482                 burst_size = (image.pix.width & 0x1f) ?
 483                              ((image.pix.width & 0xf) ? 8 : 16) : 32;
 484                 passthrough_bits = 16;
 485                 break;
 486         case V4L2_PIX_FMT_RGB565:
 487                 if (passthrough) {
 488                         burst_size = 16;
 489                         passthrough_bits = 8;
 490                         passthrough_cycles = incc->cycles;
 491                         break;
 492                 }
 493                 fallthrough;    /* non-passthrough RGB565 (CSI-2 bus) */
 494         default:
 495                 burst_size = (image.pix.width & 0xf) ? 8 : 16;
 496                 passthrough_bits = 16;
 497                 break;
 498         }
 499
 500         if (passthrough) {
 501                 if (priv->interweave_swap) {
 502                         /* start interweave scan at 1st top line (2nd line) */
 503                         image.phys0 += image.pix.bytesperline;
 504                         image.phys1 += image.pix.bytesperline;
 505                 }
 506
 507                 ipu_cpmem_set_resolution(priv->idmac_ch,
 508                                          image.rect.width * passthrough_cycles,
 509                                          image.rect.height);
 510                 ipu_cpmem_set_stride(priv->idmac_ch, image.pix.bytesperline);
 511                 ipu_cpmem_set_buffer(priv->idmac_ch, 0, image.phys0);
 512                 ipu_cpmem_set_buffer(priv->idmac_ch, 1, image.phys1);
 513                 ipu_cpmem_set_format_passthrough(priv->idmac_ch,
 514                                                  passthrough_bits);
 515         } else {
 516                 if (priv->interweave_swap) {
 517                         /* start interweave scan at 1st top line (2nd line) */
 518                         image.rect.top = 1;
 519                 }
 520
 521                 ret = ipu_cpmem_set_image(priv->idmac_ch, &image);
 522                 if (ret)
 523                         goto unsetup_vb2;
 524         }
 525
 526         ipu_cpmem_set_burstsize(priv->idmac_ch, burst_size);
 527
 528         /*
 529          * Set the channel for the direct CSI-->memory via SMFC
 530          * use-case to very high priority, by enabling the watermark
 531          * signal in the SMFC, enabling WM in the channel, and setting
 532          * the channel priority to high.
 533          *
 534          * Refer to the i.mx6 rev. D TRM Table 36-8: Calculated priority
 535          * value.
 536          *
 537          * The WM's are set very low by intention here to ensure that
 538          * the SMFC FIFOs do not overflow.
 539          */
 540         ipu_smfc_set_watermark(priv->smfc, 0x02, 0x01);
 541         ipu_cpmem_set_high_priority(priv->idmac_ch);
 542         ipu_idmac_enable_watermark(priv->idmac_ch, true);
 543         ipu_cpmem_set_axi_id(priv->idmac_ch, 0);
 544
 545         burst_size = passthrough ?
 546                 (burst_size >> 3) - 1 : (burst_size >> 2) - 1;
 547
 548         ipu_smfc_set_burstsize(priv->smfc, burst_size);
 549
 550         if (interweave)
 551                 ipu_cpmem_interlaced_scan(priv->idmac_ch,
 552                                           priv->interweave_swap ?
 553                                           -image.pix.bytesperline :
 554                                           image.pix.bytesperline,
 555                                           image.pix.pixelformat);
 556
 557         ipu_idmac_set_double_buffer(priv->idmac_ch, true);
 558
 559         return 0;
 560
 561 unsetup_vb2:
 562         csi_idmac_unsetup_vb2_buf(priv, VB2_BUF_STATE_QUEUED);
 563         return ret;
 564 }
 565
 566 static void csi_idmac_unsetup(struct csi_priv *priv,
 567                               enum vb2_buffer_state state)
 568 {
 569         ipu_idmac_disable_channel(priv->idmac_ch);
 570         ipu_smfc_disable(priv->smfc);
 571
 572         csi_idmac_unsetup_vb2_buf(priv, state);
 573 }
 574
 575 static int csi_idmac_setup(struct csi_priv *priv)
 576 {
 577         int ret;
 578
 579         ret = csi_idmac_setup_channel(priv);
 580         if (ret)
 581                 return ret;
 582
 583         ipu_cpmem_dump(priv->idmac_ch);
 584         ipu_dump(priv->ipu);
 585
 586         ipu_smfc_enable(priv->smfc);
 587
 588         /* set buffers ready */
 589         ipu_idmac_select_buffer(priv->idmac_ch, 0);
 590         ipu_idmac_select_buffer(priv->idmac_ch, 1);
 591
 592         /* enable the channels */
 593         ipu_idmac_enable_channel(priv->idmac_ch);
 594
 595         return 0;
 596 }
 597
 598 static int csi_idmac_start(struct csi_priv *priv)
 599 {
 600         struct imx_media_video_dev *vdev = priv->vdev;
 601         int ret;
 602
 603         ret = csi_idmac_get_ipu_resources(priv);
 604         if (ret)
 605                 return ret;
 606
 607         ipu_smfc_map_channel(priv->smfc, priv->csi_id, priv->vc_num);
 608
 609         ret = imx_media_alloc_dma_buf(priv->dev, &priv->underrun_buf,
 610                                       vdev->fmt.sizeimage);
 611         if (ret)
 612                 goto out_put_ipu;
 613
 614         priv->ipu_buf_num = 0;
 615
 616         /* init EOF completion waitq */
 617         init_completion(&priv->last_eof_comp);
 618         priv->frame_sequence = 0;
 619         priv->last_eof = false;
 620         priv->nfb4eof = false;
 621
 622         ret = csi_idmac_setup(priv);
 623         if (ret) {
 624                 v4l2_err(&priv->sd, "csi_idmac_setup failed: %d\n", ret);
 625                 goto out_free_dma_buf;
 626         }
 627
 628         priv->nfb4eof_irq = ipu_idmac_channel_irq(priv->ipu,
 629                                                   priv->idmac_ch,
 630                                                   IPU_IRQ_NFB4EOF);
 631         ret = devm_request_irq(priv->dev, priv->nfb4eof_irq,
 632                                csi_idmac_nfb4eof_interrupt, 0,
 633                                "imx-smfc-nfb4eof", priv);
 634         if (ret) {
 635                 v4l2_err(&priv->sd,
 636                          "Error registering NFB4EOF irq: %d\n", ret);
 637                 goto out_unsetup;
 638         }
 639
 640         priv->eof_irq = ipu_idmac_channel_irq(priv->ipu, priv->idmac_ch,
 641                                               IPU_IRQ_EOF);
 642
 643         ret = devm_request_irq(priv->dev, priv->eof_irq,
 644                                csi_idmac_eof_interrupt, 0,
 645                                "imx-smfc-eof", priv);
 646         if (ret) {
 647                 v4l2_err(&priv->sd,
 648                          "Error registering eof irq: %d\n", ret);
 649                 goto out_free_nfb4eof_irq;
 650         }
 651
 652         /* start the EOF timeout timer */
 653         mod_timer(&priv->eof_timeout_timer,
 654                   jiffies + msecs_to_jiffies(IMX_MEDIA_EOF_TIMEOUT));
 655
 656         return 0;
 657
 658 out_free_nfb4eof_irq:
 659         devm_free_irq(priv->dev, priv->nfb4eof_irq, priv);
 660 out_unsetup:
 661         csi_idmac_unsetup(priv, VB2_BUF_STATE_QUEUED);
 662 out_free_dma_buf:
 663         imx_media_free_dma_buf(priv->dev, &priv->underrun_buf);
 664 out_put_ipu:
 665         csi_idmac_put_ipu_resources(priv);
 666         return ret;
 667 }
 668
 669 static void csi_idmac_wait_last_eof(struct csi_priv *priv)
 670 {
 671         unsigned long flags;
 672         int ret;
 673
 674         /* mark next EOF interrupt as the last before stream off */
 675         spin_lock_irqsave(&priv->irqlock, flags);
 676         priv->last_eof = true;
 677         spin_unlock_irqrestore(&priv->irqlock, flags);
 678
 679         /*
 680          * and then wait for interrupt handler to mark completion.
 681          */
 682         ret = wait_for_completion_timeout(
 683                 &priv->last_eof_comp, msecs_to_jiffies(IMX_MEDIA_EOF_TIMEOUT));
 684         if (ret == 0)
 685                 v4l2_warn(&priv->sd, "wait last EOF timeout\n");
 686 }
 687
 688 static void csi_idmac_stop(struct csi_priv *priv)
 689 {
 690         devm_free_irq(priv->dev, priv->eof_irq, priv);
 691         devm_free_irq(priv->dev, priv->nfb4eof_irq, priv);
 692
 693         csi_idmac_unsetup(priv, VB2_BUF_STATE_ERROR);
 694
 695         imx_media_free_dma_buf(priv->dev, &priv->underrun_buf);
 696
 697         /* cancel the EOF timeout timer */
 698         del_timer_sync(&priv->eof_timeout_timer);
 699
 700         csi_idmac_put_ipu_resources(priv);
 701 }
 702
 703 /* Update the CSI whole sensor and active windows */
 704 static int csi_setup(struct csi_priv *priv)
 705 {
 706         struct v4l2_mbus_framefmt *infmt, *outfmt;
 707         const struct imx_media_pixfmt *incc;
 708         struct v4l2_mbus_framefmt if_fmt;
 709         struct v4l2_rect crop;
 710
 711         infmt = &priv->format_mbus[CSI_SINK_PAD];
 712         incc = priv->cc[CSI_SINK_PAD];
 713         outfmt = &priv->format_mbus[priv->active_output_pad];
 714
 715         if_fmt = *infmt;
 716         crop = priv->crop;
 717
 718         /*
 719          * if cycles is set, we need to handle this over multiple cycles as
 720          * generic/bayer data
 721          */
 722         if (is_parallel_bus(&priv->mbus_cfg) && incc->cycles) {
 723                 if_fmt.width *= incc->cycles;
 724                 crop.width *= incc->cycles;
 725         }
 726
 727         ipu_csi_set_window(priv->csi, &crop);
 728
 729         ipu_csi_set_downsize(priv->csi,
 730                              priv->crop.width == 2 * priv->compose.width,
 731                              priv->crop.height == 2 * priv->compose.height);
 732
 733         ipu_csi_init_interface(priv->csi, &priv->mbus_cfg, &if_fmt, outfmt);
 734
 735         ipu_csi_set_dest(priv->csi, priv->dest);
 736
 737         if (priv->dest == IPU_CSI_DEST_IDMAC)
 738                 ipu_csi_set_skip_smfc(priv->csi, priv->skip->skip_smfc,
 739                                       priv->skip->max_ratio - 1, 0);
 740
 741         ipu_csi_dump(priv->csi);
 742
 743         return 0;
 744 }
 745
 746 static int csi_start(struct csi_priv *priv)
 747 {
 748         struct v4l2_fract *input_fi, *output_fi;
 749         int ret;
 750
 751         input_fi = &priv->frame_interval[CSI_SINK_PAD];
 752         output_fi = &priv->frame_interval[priv->active_output_pad];
 753
 754         /* start upstream */
 755         ret = v4l2_subdev_call(priv->src_sd, video, s_stream, 1);
 756         ret = (ret && ret != -ENOIOCTLCMD) ? ret : 0;
 757         if (ret)
 758                 return ret;
 759
 760         /* Skip first few frames from a BT.656 source */
 761         if (priv->mbus_cfg.type == V4L2_MBUS_BT656) {
 762                 u32 delay_usec, bad_frames = 20;
 763
 764                 delay_usec = DIV_ROUND_UP_ULL((u64)USEC_PER_SEC *
 765                         input_fi->numerator * bad_frames,
 766                         input_fi->denominator);
 767
 768                 usleep_range(delay_usec, delay_usec + 1000);
 769         }
 770
 771         if (priv->dest == IPU_CSI_DEST_IDMAC) {
 772                 ret = csi_idmac_start(priv);
 773                 if (ret)
 774                         goto stop_upstream;
 775         }
 776
 777         ret = csi_setup(priv);
 778         if (ret)
 779                 goto idmac_stop;
 780
 781         /* start the frame interval monitor */
 782         if (priv->fim && priv->dest == IPU_CSI_DEST_IDMAC)
 783                 imx_media_fim_set_stream(priv->fim, output_fi, true);
 784
 785         ret = ipu_csi_enable(priv->csi);
 786         if (ret) {
 787                 v4l2_err(&priv->sd, "CSI enable error: %d\n", ret);
 788                 goto fim_off;
 789         }
 790
 791         return 0;
 792
 793 fim_off:
 794         if (priv->fim && priv->dest == IPU_CSI_DEST_IDMAC)
 795                 imx_media_fim_set_stream(priv->fim, NULL, false);
 796 idmac_stop:
 797         if (priv->dest == IPU_CSI_DEST_IDMAC)
 798                 csi_idmac_stop(priv);
 799 stop_upstream:
 800         v4l2_subdev_call(priv->src_sd, video, s_stream, 0);
 801         return ret;
 802 }
 803
 804 static void csi_stop(struct csi_priv *priv)
 805 {
 806         if (priv->dest == IPU_CSI_DEST_IDMAC)
 807                 csi_idmac_wait_last_eof(priv);
 808
 809         /*
 810          * Disable the CSI asap, after syncing with the last EOF.
 811          * Doing so after the IDMA channel is disabled has shown to
 812          * create hard system-wide hangs.
 813          */
 814         ipu_csi_disable(priv->csi);
 815
 816         /* stop upstream */
 817         v4l2_subdev_call(priv->src_sd, video, s_stream, 0);
 818
 819         if (priv->dest == IPU_CSI_DEST_IDMAC) {
 820                 csi_idmac_stop(priv);
 821
 822                 /* stop the frame interval monitor */
 823                 if (priv->fim)
 824                         imx_media_fim_set_stream(priv->fim, NULL, false);
 825         }
 826 }
 827
 828 static const struct csi_skip_desc csi_skip[12] = {
 829         { 1, 1, 0x00 }, /* Keep all frames */
 830         { 5, 6, 0x10 }, /* Skip every sixth frame */
 831         { 4, 5, 0x08 }, /* Skip every fifth frame */
 832         { 3, 4, 0x04 }, /* Skip every fourth frame */
 833         { 2, 3, 0x02 }, /* Skip every third frame */
 834         { 3, 5, 0x0a }, /* Skip frames 1 and 3 of every 5 */
 835         { 1, 2, 0x01 }, /* Skip every second frame */
 836         { 2, 5, 0x0b }, /* Keep frames 1 and 4 of every 5 */
 837         { 1, 3, 0x03 }, /* Keep one in three frames */
 838         { 1, 4, 0x07 }, /* Keep one in four frames */
 839         { 1, 5, 0x0f }, /* Keep one in five frames */
 840         { 1, 6, 0x1f }, /* Keep one in six frames */
 841 };
 842
 843 static void csi_apply_skip_interval(const struct csi_skip_desc *skip,
 844                                     struct v4l2_fract *interval)
 845 {
 846         unsigned int div;
 847
 848         interval->numerator *= skip->max_ratio;
 849         interval->denominator *= skip->keep;
 850
 851         /* Reduce fraction to lowest terms */
 852         div = gcd(interval->numerator, interval->denominator);
 853         if (div > 1) {
 854                 interval->numerator /= div;
 855                 interval->denominator /= div;
 856         }
 857 }
 858
 859 /*
 860  * Find the skip pattern to produce the output frame interval closest to the
 861  * requested one, for the given input frame interval. Updates the output frame
 862  * interval to the exact value.
 863  */
 864 static const struct csi_skip_desc *csi_find_best_skip(struct v4l2_fract *in,
 865                                                       struct v4l2_fract *out)
 866 {
 867         const struct csi_skip_desc *skip = &csi_skip[0], *best_skip = skip;
 868         u32 min_err = UINT_MAX;
 869         u64 want_us;
 870         int i;
 871
 872         /* Default to 1:1 ratio */
 873         if (out->numerator == 0 || out->denominator == 0 ||
 874             in->numerator == 0 || in->denominator == 0) {
 875                 *out = *in;
 876                 return best_skip;
 877         }
 878
 879         want_us = div_u64((u64)USEC_PER_SEC * out->numerator, out->denominator);
 880
 881         /* Find the reduction closest to the requested time per frame */
 882         for (i = 0; i < ARRAY_SIZE(csi_skip); i++, skip++) {
 883                 u64 tmp, err;
 884
 885                 tmp = div_u64((u64)USEC_PER_SEC * in->numerator *
 886                               skip->max_ratio, in->denominator * skip->keep);
 887
 888                 err = abs((s64)tmp - want_us);
 889                 if (err < min_err) {
 890                         min_err = err;
 891                         best_skip = skip;
 892                 }
 893         }
 894
 895         *out = *in;
 896         csi_apply_skip_interval(best_skip, out);
 897
 898         return best_skip;
 899 }
 900
 901 /*
 902  * V4L2 subdev operations.
 903  */
 904
 905 static int csi_get_frame_interval(struct v4l2_subdev *sd,
 906                                   struct v4l2_subdev_state *sd_state,
 907                                   struct v4l2_subdev_frame_interval *fi)
 908 {
 909         struct csi_priv *priv = v4l2_get_subdevdata(sd);
 910
 911         /*
 912          * FIXME: Implement support for V4L2_SUBDEV_FORMAT_TRY, using the V4L2
 913          * subdev active state API.
 914          */
 915         if (fi->which != V4L2_SUBDEV_FORMAT_ACTIVE)
 916                 return -EINVAL;
 917
 918         if (fi->pad >= CSI_NUM_PADS)
 919                 return -EINVAL;
 920
 921         mutex_lock(&priv->lock);
 922
 923         fi->interval = priv->frame_interval[fi->pad];
 924
 925         mutex_unlock(&priv->lock);
 926
 927         return 0;
 928 }
 929
 930 static int csi_set_frame_interval(struct v4l2_subdev *sd,
 931                                   struct v4l2_subdev_state *sd_state,
 932                                   struct v4l2_subdev_frame_interval *fi)
 933 {
 934         struct csi_priv *priv = v4l2_get_subdevdata(sd);
 935         struct v4l2_fract *input_fi;
 936         int ret = 0;
 937
 938         /*
 939          * FIXME: Implement support for V4L2_SUBDEV_FORMAT_TRY, using the V4L2
 940          * subdev active state API.
 941          */
 942         if (fi->which != V4L2_SUBDEV_FORMAT_ACTIVE)
 943                 return -EINVAL;
 944
 945         mutex_lock(&priv->lock);
 946
 947         input_fi = &priv->frame_interval[CSI_SINK_PAD];
 948
 949         switch (fi->pad) {
 950         case CSI_SINK_PAD:
 951                 /* No limits on valid input frame intervals */
 952                 if (fi->interval.numerator == 0 ||
 953                     fi->interval.denominator == 0)
 954                         fi->interval = *input_fi;
 955                 /* Reset output intervals and frame skipping ratio to 1:1 */
 956                 priv->frame_interval[CSI_SRC_PAD_IDMAC] = fi->interval;
 957                 priv->frame_interval[CSI_SRC_PAD_DIRECT] = fi->interval;
 958                 priv->skip = &csi_skip[0];
 959                 break;
 960         case CSI_SRC_PAD_IDMAC:
 961                 /*
 962                  * frame interval at IDMAC output pad depends on input
 963                  * interval, modified by frame skipping.
 964                  */
 965                 priv->skip = csi_find_best_skip(input_fi, &fi->interval);
 966                 break;
 967         case CSI_SRC_PAD_DIRECT:
 968                 /*
 969                  * frame interval at DIRECT output pad is same as input
 970                  * interval.
 971                  */
 972                 fi->interval = *input_fi;
 973                 break;
 974         default:
 975                 ret = -EINVAL;
 976                 goto out;
 977         }
 978
 979         priv->frame_interval[fi->pad] = fi->interval;
 980 out:
 981         mutex_unlock(&priv->lock);
 982         return ret;
 983 }
 984
 985 static int csi_s_stream(struct v4l2_subdev *sd, int enable)
 986 {
 987         struct csi_priv *priv = v4l2_get_subdevdata(sd);
 988         int ret = 0;
 989
 990         mutex_lock(&priv->lock);
 991
 992         if (!priv->src_sd || !priv->sink) {
 993                 ret = -EPIPE;
 994                 goto out;
 995         }
 996
 997         /*
 998          * enable/disable streaming only if stream_count is
 999          * going from 0 to 1 / 1 to 0.
1000          */
1001         if (priv->stream_count != !enable)
1002                 goto update_count;
1003
1004         if (enable) {
1005                 dev_dbg(priv->dev, "stream ON\n");
1006                 ret = csi_start(priv);
1007                 if (ret)
1008                         goto out;
1009         } else {
1010                 dev_dbg(priv->dev, "stream OFF\n");
1011                 csi_stop(priv);
1012         }
1013
1014 update_count:
1015         priv->stream_count += enable ? 1 : -1;
1016         if (priv->stream_count < 0)
1017                 priv->stream_count = 0;
1018 out:
1019         mutex_unlock(&priv->lock);
1020         return ret;
1021 }
1022
1023 static int csi_link_setup(struct media_entity *entity,
1024                           const struct media_pad *local,
1025                           const struct media_pad *remote, u32 flags)
1026 {
1027         struct v4l2_subdev *sd = media_entity_to_v4l2_subdev(entity);
1028         struct csi_priv *priv = v4l2_get_subdevdata(sd);
1029         struct v4l2_subdev *remote_sd;
1030         int ret = 0;
1031
1032         dev_dbg(priv->dev, "link setup %s -> %s\n", remote->entity->name,
1033                 local->entity->name);
1034
1035         mutex_lock(&priv->lock);
1036
1037         if (local->flags & MEDIA_PAD_FL_SINK) {
1038                 if (!is_media_entity_v4l2_subdev(remote->entity)) {
1039                         ret = -EINVAL;
1040                         goto out;
1041                 }
1042
1043                 remote_sd = media_entity_to_v4l2_subdev(remote->entity);
1044
1045                 if (flags & MEDIA_LNK_FL_ENABLED) {
1046                         if (priv->src_sd) {
1047                                 ret = -EBUSY;
1048                                 goto out;
1049                         }
1050                         priv->src_sd = remote_sd;
1051                 } else {
1052                         priv->src_sd = NULL;
1053                 }
1054
1055                 goto out;
1056         }
1057
1058         /* this is a source pad */
1059
1060         if (flags & MEDIA_LNK_FL_ENABLED) {
1061                 if (priv->sink) {
1062                         ret = -EBUSY;
1063                         goto out;
1064                 }
1065         } else {
1066                 v4l2_ctrl_handler_free(&priv->ctrl_hdlr);
1067                 v4l2_ctrl_handler_init(&priv->ctrl_hdlr, 0);
1068                 priv->sink = NULL;
1069                 /* do not apply IC burst alignment in csi_try_crop */
1070                 priv->active_output_pad = CSI_SRC_PAD_IDMAC;
1071                 goto out;
1072         }
1073
1074         /* record which output pad is now active */
1075         priv->active_output_pad = local->index;
1076
1077         /* set CSI destination */
1078         if (local->index == CSI_SRC_PAD_IDMAC) {
1079                 if (!is_media_entity_v4l2_video_device(remote->entity)) {
1080                         ret = -EINVAL;
1081                         goto out;
1082                 }
1083
1084                 if (priv->fim) {
1085                         ret = imx_media_fim_add_controls(priv->fim);
1086                         if (ret)
1087                                 goto out;
1088                 }
1089
1090                 priv->dest = IPU_CSI_DEST_IDMAC;
1091         } else {
1092                 if (!is_media_entity_v4l2_subdev(remote->entity)) {
1093                         ret = -EINVAL;
1094                         goto out;
1095                 }
1096
1097                 remote_sd = media_entity_to_v4l2_subdev(remote->entity);
1098                 switch (remote_sd->grp_id) {
1099                 case IMX_MEDIA_GRP_ID_IPU_VDIC:
1100                         priv->dest = IPU_CSI_DEST_VDIC;
1101                         break;
1102                 case IMX_MEDIA_GRP_ID_IPU_IC_PRP:
1103                         priv->dest = IPU_CSI_DEST_IC;
1104                         break;
1105                 default:
1106                         ret = -EINVAL;
1107                         goto out;
1108                 }
1109         }
1110
1111         priv->sink = remote->entity;
1112 out:
1113         mutex_unlock(&priv->lock);
1114         return ret;
1115 }
1116
1117 static int csi_link_validate(struct v4l2_subdev *sd,
1118                              struct media_link *link,
1119                              struct v4l2_subdev_format *source_fmt,
1120                              struct v4l2_subdev_format *sink_fmt)
1121 {
1122         struct csi_priv *priv = v4l2_get_subdevdata(sd);
1123         struct v4l2_mbus_config mbus_cfg = { .type = 0 };
1124         bool is_csi2;
1125         int ret;
1126
1127         ret = v4l2_subdev_link_validate_default(sd, link,
1128                                                 source_fmt, sink_fmt);
1129         if (ret)
1130                 return ret;
1131
1132         ret = csi_get_upstream_mbus_config(priv, &mbus_cfg);
1133         if (ret) {
1134                 v4l2_err(&priv->sd,
1135                          "failed to get upstream media bus configuration\n");
1136                 return ret;
1137         }
1138
1139         mutex_lock(&priv->lock);
1140
1141         priv->mbus_cfg = mbus_cfg;
1142         is_csi2 = !is_parallel_bus(&mbus_cfg);
1143         if (is_csi2) {
1144                 /*
1145                  * NOTE! It seems the virtual channels from the mipi csi-2
1146                  * receiver are used only for routing by the video mux's,
1147                  * or for hard-wired routing to the CSI's. Once the stream
1148                  * enters the CSI's however, they are treated internally
1149                  * in the IPU as virtual channel 0.
1150                  */
1151                 ipu_csi_set_mipi_datatype(priv->csi, 0,
1152                                           &priv->format_mbus[CSI_SINK_PAD]);
1153         }
1154
1155         /* select either parallel or MIPI-CSI2 as input to CSI */
1156         ipu_set_csi_src_mux(priv->ipu, priv->csi_id, is_csi2);
1157
1158         mutex_unlock(&priv->lock);
1159         return ret;
1160 }
1161
1162 static struct v4l2_mbus_framefmt *
1163 __csi_get_fmt(struct csi_priv *priv, struct v4l2_subdev_state *sd_state,
1164               unsigned int pad, enum v4l2_subdev_format_whence which)
1165 {
1166         if (which == V4L2_SUBDEV_FORMAT_TRY)
1167                 return v4l2_subdev_state_get_format(sd_state, pad);
1168         else
1169                 return &priv->format_mbus[pad];
1170 }
1171
1172 static struct v4l2_rect *
1173 __csi_get_crop(struct csi_priv *priv, struct v4l2_subdev_state *sd_state,
1174                enum v4l2_subdev_format_whence which)
1175 {
1176         if (which == V4L2_SUBDEV_FORMAT_TRY)
1177                 return v4l2_subdev_state_get_crop(sd_state, CSI_SINK_PAD);
1178         else
1179                 return &priv->crop;
1180 }
1181
1182 static struct v4l2_rect *
1183 __csi_get_compose(struct csi_priv *priv, struct v4l2_subdev_state *sd_state,
1184                   enum v4l2_subdev_format_whence which)
1185 {
1186         if (which == V4L2_SUBDEV_FORMAT_TRY)
1187                 return v4l2_subdev_state_get_compose(sd_state, CSI_SINK_PAD);
1188         else
1189                 return &priv->compose;
1190 }
1191
1192 static void csi_try_crop(struct csi_priv *priv,
1193                          struct v4l2_rect *crop,
1194                          struct v4l2_subdev_state *sd_state,
1195                          struct v4l2_mbus_framefmt *infmt,
1196                          struct v4l2_mbus_config *mbus_cfg)
1197 {
1198         u32 in_height;
1199
1200         crop->width = min_t(__u32, infmt->width, crop->width);
1201         if (crop->left + crop->width > infmt->width)
1202                 crop->left = infmt->width - crop->width;
1203         /* adjust crop left/width to h/w alignment restrictions */
1204         crop->left &= ~0x3;
1205         if (priv->active_output_pad == CSI_SRC_PAD_DIRECT)
1206                 crop->width &= ~0x7; /* multiple of 8 pixels (IC burst) */
1207         else
1208                 crop->width &= ~0x1; /* multiple of 2 pixels */
1209
1210         in_height = infmt->height;
1211         if (infmt->field == V4L2_FIELD_ALTERNATE)
1212                 in_height *= 2;
1213
1214         /*
1215          * FIXME: not sure why yet, but on interlaced bt.656,
1216          * changing the vertical cropping causes loss of vertical
1217          * sync, so fix it to NTSC/PAL active lines. NTSC contains
1218          * 2 extra lines of active video that need to be cropped.
1219          */
1220         if (mbus_cfg->type == V4L2_MBUS_BT656 &&
1221             (V4L2_FIELD_HAS_BOTH(infmt->field) ||
1222              infmt->field == V4L2_FIELD_ALTERNATE)) {
1223                 crop->height = in_height;
1224                 crop->top = (in_height == 480) ? 2 : 0;
1225         } else {
1226                 crop->height = min_t(__u32, in_height, crop->height);
1227                 if (crop->top + crop->height > in_height)
1228                         crop->top = in_height - crop->height;
1229         }
1230 }
1231
1232 static int csi_enum_mbus_code(struct v4l2_subdev *sd,
1233                               struct v4l2_subdev_state *sd_state,
1234                               struct v4l2_subdev_mbus_code_enum *code)
1235 {
1236         struct csi_priv *priv = v4l2_get_subdevdata(sd);
1237         struct v4l2_mbus_config mbus_cfg = { .type = 0 };
1238         const struct imx_media_pixfmt *incc;
1239         struct v4l2_mbus_framefmt *infmt;
1240         int ret = 0;
1241
1242         mutex_lock(&priv->lock);
1243
1244         infmt = __csi_get_fmt(priv, sd_state, CSI_SINK_PAD, code->which);
1245         incc = imx_media_find_mbus_format(infmt->code, PIXFMT_SEL_ANY);
1246
1247         switch (code->pad) {
1248         case CSI_SINK_PAD:
1249                 ret = imx_media_enum_mbus_formats(&code->code, code->index,
1250                                                   PIXFMT_SEL_ANY);
1251                 break;
1252         case CSI_SRC_PAD_DIRECT:
1253         case CSI_SRC_PAD_IDMAC:
1254                 ret = csi_get_upstream_mbus_config(priv, &mbus_cfg);
1255                 if (ret) {
1256                         v4l2_err(&priv->sd,
1257                                  "failed to get upstream media bus configuration\n");
1258                         goto out;
1259                 }
1260
1261                 if (requires_passthrough(&mbus_cfg, infmt, incc)) {
1262                         if (code->index != 0) {
1263                                 ret = -EINVAL;
1264                                 goto out;
1265                         }
1266                         code->code = infmt->code;
1267                 } else {
1268                         enum imx_pixfmt_sel fmt_sel =
1269                                 (incc->cs == IPUV3_COLORSPACE_YUV) ?
1270                                 PIXFMT_SEL_YUV : PIXFMT_SEL_RGB;
1271
1272                         ret = imx_media_enum_ipu_formats(&code->code,
1273                                                          code->index,
1274                                                          fmt_sel);
1275                 }
1276                 break;
1277         default:
1278                 ret = -EINVAL;
1279         }
1280
1281 out:
1282         mutex_unlock(&priv->lock);
1283         return ret;
1284 }
1285
1286 static int csi_enum_frame_size(struct v4l2_subdev *sd,
1287                                struct v4l2_subdev_state *sd_state,
1288                                struct v4l2_subdev_frame_size_enum *fse)
1289 {
1290         struct csi_priv *priv = v4l2_get_subdevdata(sd);
1291         struct v4l2_rect *crop;
1292         int ret = 0;
1293
1294         if (fse->pad >= CSI_NUM_PADS ||
1295             fse->index > (fse->pad == CSI_SINK_PAD ? 0 : 3))
1296                 return -EINVAL;
1297
1298         mutex_lock(&priv->lock);
1299
1300         if (fse->pad == CSI_SINK_PAD) {
1301                 fse->min_width = MIN_W;
1302                 fse->max_width = MAX_W;
1303                 fse->min_height = MIN_H;
1304                 fse->max_height = MAX_H;
1305         } else {
1306                 crop = __csi_get_crop(priv, sd_state, fse->which);
1307
1308                 fse->min_width = fse->index & 1 ?
1309                         crop->width / 2 : crop->width;
1310                 fse->max_width = fse->min_width;
1311                 fse->min_height = fse->index & 2 ?
1312                         crop->height / 2 : crop->height;
1313                 fse->max_height = fse->min_height;
1314         }
1315
1316         mutex_unlock(&priv->lock);
1317         return ret;
1318 }
1319
1320 static int csi_enum_frame_interval(struct v4l2_subdev *sd,
1321                                    struct v4l2_subdev_state *sd_state,
1322                                    struct v4l2_subdev_frame_interval_enum *fie)
1323 {
1324         struct csi_priv *priv = v4l2_get_subdevdata(sd);
1325         struct v4l2_fract *input_fi;
1326         struct v4l2_rect *crop;
1327         int ret = 0;
1328
1329         if (fie->pad >= CSI_NUM_PADS ||
1330             fie->index >= (fie->pad != CSI_SRC_PAD_IDMAC ?
1331                            1 : ARRAY_SIZE(csi_skip)))
1332                 return -EINVAL;
1333
1334         mutex_lock(&priv->lock);
1335
1336         input_fi = &priv->frame_interval[CSI_SINK_PAD];
1337         crop = __csi_get_crop(priv, sd_state, fie->which);
1338
1339         if ((fie->width != crop->width && fie->width != crop->width / 2) ||
1340             (fie->height != crop->height && fie->height != crop->height / 2)) {
1341                 ret = -EINVAL;
1342                 goto out;
1343         }
1344
1345         fie->interval = *input_fi;
1346
1347         if (fie->pad == CSI_SRC_PAD_IDMAC)
1348                 csi_apply_skip_interval(&csi_skip[fie->index],
1349                                         &fie->interval);
1350
1351 out:
1352         mutex_unlock(&priv->lock);
1353         return ret;
1354 }
1355
1356 static int csi_get_fmt(struct v4l2_subdev *sd,
1357                        struct v4l2_subdev_state *sd_state,
1358                        struct v4l2_subdev_format *sdformat)
1359 {
1360         struct csi_priv *priv = v4l2_get_subdevdata(sd);
1361         struct v4l2_mbus_framefmt *fmt;
1362         int ret = 0;
1363
1364         if (sdformat->pad >= CSI_NUM_PADS)
1365                 return -EINVAL;
1366
1367         mutex_lock(&priv->lock);
1368
1369         fmt = __csi_get_fmt(priv, sd_state, sdformat->pad, sdformat->which);
1370         if (!fmt) {
1371                 ret = -EINVAL;
1372                 goto out;
1373         }
1374
1375         sdformat->format = *fmt;
1376 out:
1377         mutex_unlock(&priv->lock);
1378         return ret;
1379 }
1380
1381 static void csi_try_field(struct csi_priv *priv,
1382                           struct v4l2_subdev_state *sd_state,
1383                           struct v4l2_subdev_format *sdformat)
1384 {
1385         struct v4l2_mbus_framefmt *infmt =
1386                 __csi_get_fmt(priv, sd_state, CSI_SINK_PAD, sdformat->which);
1387
1388         /*
1389          * no restrictions on sink pad field type except must
1390          * be initialized.
1391          */
1392         if (sdformat->pad == CSI_SINK_PAD) {
1393                 if (sdformat->format.field == V4L2_FIELD_ANY)
1394                         sdformat->format.field = V4L2_FIELD_NONE;
1395                 return;
1396         }
1397
1398         switch (infmt->field) {
1399         case V4L2_FIELD_SEQ_TB:
1400         case V4L2_FIELD_SEQ_BT:
1401                 /*
1402                  * If the user requests sequential at the source pad,
1403                  * allow it (along with possibly inverting field order).
1404                  * Otherwise passthrough the field type.
1405                  */
1406                 if (!V4L2_FIELD_IS_SEQUENTIAL(sdformat->format.field))
1407                         sdformat->format.field = infmt->field;
1408                 break;
1409         case V4L2_FIELD_ALTERNATE:
1410                 /*
1411                  * This driver does not support alternate field mode, and
1412                  * the CSI captures a whole frame, so the CSI never presents
1413                  * alternate mode at its source pads. If user has not
1414                  * already requested sequential, translate ALTERNATE at
1415                  * sink pad to SEQ_TB or SEQ_BT at the source pad depending
1416                  * on input height (assume NTSC BT order if 480 total active
1417                  * frame lines, otherwise PAL TB order).
1418                  */
1419                 if (!V4L2_FIELD_IS_SEQUENTIAL(sdformat->format.field))
1420                         sdformat->format.field = (infmt->height == 480 / 2) ?
1421                                 V4L2_FIELD_SEQ_BT : V4L2_FIELD_SEQ_TB;
1422                 break;
1423         default:
1424                 /* Passthrough for all other input field types */
1425                 sdformat->format.field = infmt->field;
1426                 break;
1427         }
1428 }
1429
1430 static void csi_try_fmt(struct csi_priv *priv,
1431                         struct v4l2_mbus_config *mbus_cfg,
1432                         struct v4l2_subdev_state *sd_state,
1433                         struct v4l2_subdev_format *sdformat,
1434                         struct v4l2_rect *crop,
1435                         struct v4l2_rect *compose,
1436                         const struct imx_media_pixfmt **cc)
1437 {
1438         const struct imx_media_pixfmt *incc;
1439         struct v4l2_mbus_framefmt *infmt;
1440         u32 code;
1441
1442         infmt = __csi_get_fmt(priv, sd_state, CSI_SINK_PAD, sdformat->which);
1443
1444         switch (sdformat->pad) {
1445         case CSI_SRC_PAD_DIRECT:
1446         case CSI_SRC_PAD_IDMAC:
1447                 incc = imx_media_find_mbus_format(infmt->code, PIXFMT_SEL_ANY);
1448
1449                 sdformat->format.width = compose->width;
1450                 sdformat->format.height = compose->height;
1451
1452                 if (requires_passthrough(mbus_cfg, infmt, incc)) {
1453                         sdformat->format.code = infmt->code;
1454                         *cc = incc;
1455                 } else {
1456                         enum imx_pixfmt_sel fmt_sel =
1457                                 (incc->cs == IPUV3_COLORSPACE_YUV) ?
1458                                 PIXFMT_SEL_YUV : PIXFMT_SEL_RGB;
1459
1460                         *cc = imx_media_find_ipu_format(sdformat->format.code,
1461                                                         fmt_sel);
1462                         if (!*cc) {
1463                                 imx_media_enum_ipu_formats(&code, 0, fmt_sel);
1464                                 *cc = imx_media_find_ipu_format(code, fmt_sel);
1465                                 sdformat->format.code = (*cc)->codes[0];
1466                         }
1467                 }
1468
1469                 csi_try_field(priv, sd_state, sdformat);
1470
1471                 /* propagate colorimetry from sink */
1472                 sdformat->format.colorspace = infmt->colorspace;
1473                 sdformat->format.xfer_func = infmt->xfer_func;
1474                 sdformat->format.quantization = infmt->quantization;
1475                 sdformat->format.ycbcr_enc = infmt->ycbcr_enc;
1476
1477                 break;
1478         case CSI_SINK_PAD:
1479                 v4l_bound_align_image(&sdformat->format.width, MIN_W, MAX_W,
1480                                       W_ALIGN, &sdformat->format.height,
1481                                       MIN_H, MAX_H, H_ALIGN, S_ALIGN);
1482
1483                 *cc = imx_media_find_mbus_format(sdformat->format.code,
1484                                                  PIXFMT_SEL_ANY);
1485                 if (!*cc) {
1486                         imx_media_enum_mbus_formats(&code, 0,
1487                                                     PIXFMT_SEL_YUV_RGB);
1488                         *cc = imx_media_find_mbus_format(code,
1489                                                          PIXFMT_SEL_YUV_RGB);
1490                         sdformat->format.code = (*cc)->codes[0];
1491                 }
1492
1493                 csi_try_field(priv, sd_state, sdformat);
1494
1495                 /* Reset crop and compose rectangles */
1496                 crop->left = 0;
1497                 crop->top = 0;
1498                 crop->width = sdformat->format.width;
1499                 crop->height = sdformat->format.height;
1500                 if (sdformat->format.field == V4L2_FIELD_ALTERNATE)
1501                         crop->height *= 2;
1502                 csi_try_crop(priv, crop, sd_state, &sdformat->format, mbus_cfg);
1503                 compose->left = 0;
1504                 compose->top = 0;
1505                 compose->width = crop->width;
1506                 compose->height = crop->height;
1507
1508                 break;
1509         }
1510
1511         imx_media_try_colorimetry(&sdformat->format,
1512                         priv->active_output_pad == CSI_SRC_PAD_DIRECT);
1513 }
1514
1515 static int csi_set_fmt(struct v4l2_subdev *sd,
1516                        struct v4l2_subdev_state *sd_state,
1517                        struct v4l2_subdev_format *sdformat)
1518 {
1519         struct csi_priv *priv = v4l2_get_subdevdata(sd);
1520         struct v4l2_mbus_config mbus_cfg = { .type = 0 };
1521         const struct imx_media_pixfmt *cc;
1522         struct v4l2_mbus_framefmt *fmt;
1523         struct v4l2_rect *crop, *compose;
1524         int ret;
1525
1526         if (sdformat->pad >= CSI_NUM_PADS)
1527                 return -EINVAL;
1528
1529         ret = csi_get_upstream_mbus_config(priv, &mbus_cfg);
1530         if (ret) {
1531                 v4l2_err(&priv->sd,
1532                          "failed to get upstream media bus configuration\n");
1533                 return ret;
1534         }
1535
1536         mutex_lock(&priv->lock);
1537
1538         if (priv->stream_count > 0) {
1539                 ret = -EBUSY;
1540                 goto out;
1541         }
1542
1543         crop = __csi_get_crop(priv, sd_state, sdformat->which);
1544         compose = __csi_get_compose(priv, sd_state, sdformat->which);
1545
1546         csi_try_fmt(priv, &mbus_cfg, sd_state, sdformat, crop, compose, &cc);
1547
1548         fmt = __csi_get_fmt(priv, sd_state, sdformat->pad, sdformat->which);
1549         *fmt = sdformat->format;
1550
1551         if (sdformat->pad == CSI_SINK_PAD) {
1552                 int pad;
1553
1554                 /* propagate format to source pads */
1555                 for (pad = CSI_SINK_PAD + 1; pad < CSI_NUM_PADS; pad++) {
1556                         const struct imx_media_pixfmt *outcc;
1557                         struct v4l2_mbus_framefmt *outfmt;
1558                         struct v4l2_subdev_format format;
1559
1560                         format.pad = pad;
1561                         format.which = sdformat->which;
1562                         format.format = sdformat->format;
1563                         csi_try_fmt(priv, &mbus_cfg, sd_state, &format, NULL,
1564                                     compose, &outcc);
1565
1566                         outfmt = __csi_get_fmt(priv, sd_state, pad,
1567                                                sdformat->which);
1568                         *outfmt = format.format;
1569
1570                         if (sdformat->which == V4L2_SUBDEV_FORMAT_ACTIVE)
1571                                 priv->cc[pad] = outcc;
1572                 }
1573         }
1574
1575         if (sdformat->which == V4L2_SUBDEV_FORMAT_ACTIVE)
1576                 priv->cc[sdformat->pad] = cc;
1577
1578 out:
1579         mutex_unlock(&priv->lock);
1580         return ret;
1581 }
1582
1583 static int csi_get_selection(struct v4l2_subdev *sd,
1584                              struct v4l2_subdev_state *sd_state,
1585                              struct v4l2_subdev_selection *sel)
1586 {
1587         struct csi_priv *priv = v4l2_get_subdevdata(sd);
1588         struct v4l2_mbus_framefmt *infmt;
1589         struct v4l2_rect *crop, *compose;
1590         int ret = 0;
1591
1592         if (sel->pad != CSI_SINK_PAD)
1593                 return -EINVAL;
1594
1595         mutex_lock(&priv->lock);
1596
1597         infmt = __csi_get_fmt(priv, sd_state, CSI_SINK_PAD, sel->which);
1598         crop = __csi_get_crop(priv, sd_state, sel->which);
1599         compose = __csi_get_compose(priv, sd_state, sel->which);
1600
1601         switch (sel->target) {
1602         case V4L2_SEL_TGT_CROP_BOUNDS:
1603                 sel->r.left = 0;
1604                 sel->r.top = 0;
1605                 sel->r.width = infmt->width;
1606                 sel->r.height = infmt->height;
1607                 if (infmt->field == V4L2_FIELD_ALTERNATE)
1608                         sel->r.height *= 2;
1609                 break;
1610         case V4L2_SEL_TGT_CROP:
1611                 sel->r = *crop;
1612                 break;
1613         case V4L2_SEL_TGT_COMPOSE_BOUNDS:
1614                 sel->r.left = 0;
1615                 sel->r.top = 0;
1616                 sel->r.width = crop->width;
1617                 sel->r.height = crop->height;
1618                 break;
1619         case V4L2_SEL_TGT_COMPOSE:
1620                 sel->r = *compose;
1621                 break;
1622         default:
1623                 ret = -EINVAL;
1624         }
1625
1626         mutex_unlock(&priv->lock);
1627         return ret;
1628 }
1629
1630 static int csi_set_scale(u32 *compose, u32 crop, u32 flags)
1631 {
1632         if ((flags & (V4L2_SEL_FLAG_LE | V4L2_SEL_FLAG_GE)) ==
1633                      (V4L2_SEL_FLAG_LE | V4L2_SEL_FLAG_GE) &&
1634             *compose != crop && *compose != crop / 2)
1635                 return -ERANGE;
1636
1637         if (*compose <= crop / 2 ||
1638             (*compose < crop * 3 / 4 && !(flags & V4L2_SEL_FLAG_GE)) ||
1639             (*compose < crop && (flags & V4L2_SEL_FLAG_LE)))
1640                 *compose = crop / 2;
1641         else
1642                 *compose = crop;
1643
1644         return 0;
1645 }
1646
1647 static int csi_set_selection(struct v4l2_subdev *sd,
1648                              struct v4l2_subdev_state *sd_state,
1649                              struct v4l2_subdev_selection *sel)
1650 {
1651         struct csi_priv *priv = v4l2_get_subdevdata(sd);
1652         struct v4l2_mbus_config mbus_cfg = { .type = 0 };
1653         struct v4l2_mbus_framefmt *infmt;
1654         struct v4l2_rect *crop, *compose;
1655         int pad, ret;
1656
1657         if (sel->pad != CSI_SINK_PAD)
1658                 return -EINVAL;
1659
1660         ret = csi_get_upstream_mbus_config(priv, &mbus_cfg);
1661         if (ret) {
1662                 v4l2_err(&priv->sd,
1663                          "failed to get upstream media bus configuration\n");
1664                 return ret;
1665         }
1666
1667         mutex_lock(&priv->lock);
1668
1669         if (priv->stream_count > 0) {
1670                 ret = -EBUSY;
1671                 goto out;
1672         }
1673
1674         infmt = __csi_get_fmt(priv, sd_state, CSI_SINK_PAD, sel->which);
1675         crop = __csi_get_crop(priv, sd_state, sel->which);
1676         compose = __csi_get_compose(priv, sd_state, sel->which);
1677
1678         switch (sel->target) {
1679         case V4L2_SEL_TGT_CROP:
1680                 /*
1681                  * Modifying the crop rectangle always changes the format on
1682                  * the source pads. If the KEEP_CONFIG flag is set, just return
1683                  * the current crop rectangle.
1684                  */
1685                 if (sel->flags & V4L2_SEL_FLAG_KEEP_CONFIG) {
1686                         sel->r = priv->crop;
1687                         if (sel->which == V4L2_SUBDEV_FORMAT_TRY)
1688                                 *crop = sel->r;
1689                         goto out;
1690                 }
1691
1692                 csi_try_crop(priv, &sel->r, sd_state, infmt, &mbus_cfg);
1693
1694                 *crop = sel->r;
1695
1696                 /* Reset scaling to 1:1 */
1697                 compose->width = crop->width;
1698                 compose->height = crop->height;
1699                 break;
1700         case V4L2_SEL_TGT_COMPOSE:
1701                 /*
1702                  * Modifying the compose rectangle always changes the format on
1703                  * the source pads. If the KEEP_CONFIG flag is set, just return
1704                  * the current compose rectangle.
1705                  */
1706                 if (sel->flags & V4L2_SEL_FLAG_KEEP_CONFIG) {
1707                         sel->r = priv->compose;
1708                         if (sel->which == V4L2_SUBDEV_FORMAT_TRY)
1709                                 *compose = sel->r;
1710                         goto out;
1711                 }
1712
1713                 sel->r.left = 0;
1714                 sel->r.top = 0;
1715                 ret = csi_set_scale(&sel->r.width, crop->width, sel->flags);
1716                 if (ret)
1717                         goto out;
1718                 ret = csi_set_scale(&sel->r.height, crop->height, sel->flags);
1719                 if (ret)
1720                         goto out;
1721
1722                 *compose = sel->r;
1723                 break;
1724         default:
1725                 ret = -EINVAL;
1726                 goto out;
1727         }
1728
1729         /* Reset source pads to sink compose rectangle */
1730         for (pad = CSI_SINK_PAD + 1; pad < CSI_NUM_PADS; pad++) {
1731                 struct v4l2_mbus_framefmt *outfmt;
1732
1733                 outfmt = __csi_get_fmt(priv, sd_state, pad, sel->which);
1734                 outfmt->width = compose->width;
1735                 outfmt->height = compose->height;
1736         }
1737
1738 out:
1739         mutex_unlock(&priv->lock);
1740         return ret;
1741 }
1742
1743 static int csi_subscribe_event(struct v4l2_subdev *sd, struct v4l2_fh *fh,
1744                                struct v4l2_event_subscription *sub)
1745 {
1746         if (sub->type != V4L2_EVENT_IMX_FRAME_INTERVAL_ERROR)
1747                 return -EINVAL;
1748         if (sub->id != 0)
1749                 return -EINVAL;
1750
1751         return v4l2_event_subscribe(fh, sub, 0, NULL);
1752 }
1753
1754 static int csi_unsubscribe_event(struct v4l2_subdev *sd, struct v4l2_fh *fh,
1755                                  struct v4l2_event_subscription *sub)
1756 {
1757         return v4l2_event_unsubscribe(fh, sub);
1758 }
1759
1760 static int csi_registered(struct v4l2_subdev *sd)
1761 {
1762         struct csi_priv *priv = v4l2_get_subdevdata(sd);
1763         struct ipu_csi *csi;
1764         int i, ret;
1765         u32 code;
1766
1767         /* get handle to IPU CSI */
1768         csi = ipu_csi_get(priv->ipu, priv->csi_id);
1769         if (IS_ERR(csi)) {
1770                 v4l2_err(&priv->sd, "failed to get CSI%d\n", priv->csi_id);
1771                 return PTR_ERR(csi);
1772         }
1773         priv->csi = csi;
1774
1775         for (i = 0; i < CSI_NUM_PADS; i++) {
1776                 code = 0;
1777                 if (i != CSI_SINK_PAD)
1778                         imx_media_enum_ipu_formats(&code, 0, PIXFMT_SEL_YUV);
1779
1780                 /* set a default mbus format  */
1781                 ret = imx_media_init_mbus_fmt(&priv->format_mbus[i],
1782                                               IMX_MEDIA_DEF_PIX_WIDTH,
1783                                               IMX_MEDIA_DEF_PIX_HEIGHT, code,
1784                                               V4L2_FIELD_NONE, &priv->cc[i]);
1785                 if (ret)
1786                         goto put_csi;
1787
1788                 /* init default frame interval */
1789                 priv->frame_interval[i].numerator = 1;
1790                 priv->frame_interval[i].denominator = 30;
1791         }
1792
1793         /* disable frame skipping */
1794         priv->skip = &csi_skip[0];
1795
1796         /* init default crop and compose rectangle sizes */
1797         priv->crop.width = IMX_MEDIA_DEF_PIX_WIDTH;
1798         priv->crop.height = IMX_MEDIA_DEF_PIX_HEIGHT;
1799         priv->compose.width = IMX_MEDIA_DEF_PIX_WIDTH;
1800         priv->compose.height = IMX_MEDIA_DEF_PIX_HEIGHT;
1801
1802         priv->fim = imx_media_fim_init(&priv->sd);
1803         if (IS_ERR(priv->fim)) {
1804                 ret = PTR_ERR(priv->fim);
1805                 goto put_csi;
1806         }
1807
1808         priv->vdev = imx_media_capture_device_init(priv->sd.dev, &priv->sd,
1809                                                    CSI_SRC_PAD_IDMAC, true);
1810         if (IS_ERR(priv->vdev)) {
1811                 ret = PTR_ERR(priv->vdev);
1812                 goto free_fim;
1813         }
1814
1815         ret = imx_media_capture_device_register(priv->vdev, 0);
1816         if (ret)
1817                 goto remove_vdev;
1818
1819         return 0;
1820
1821 remove_vdev:
1822         imx_media_capture_device_remove(priv->vdev);
1823 free_fim:
1824         if (priv->fim)
1825                 imx_media_fim_free(priv->fim);
1826 put_csi:
1827         ipu_csi_put(priv->csi);
1828         return ret;
1829 }
1830
1831 static void csi_unregistered(struct v4l2_subdev *sd)
1832 {
1833         struct csi_priv *priv = v4l2_get_subdevdata(sd);
1834
1835         imx_media_capture_device_unregister(priv->vdev);
1836         imx_media_capture_device_remove(priv->vdev);
1837
1838         if (priv->fim)
1839                 imx_media_fim_free(priv->fim);
1840
1841         if (priv->csi)
1842                 ipu_csi_put(priv->csi);
1843 }
1844
1845 /*
1846  * The CSI has only one fwnode endpoint, at the sink pad. Verify the
1847  * endpoint belongs to us, and return CSI_SINK_PAD.
1848  */
1849 static int csi_get_fwnode_pad(struct media_entity *entity,
1850                               struct fwnode_endpoint *endpoint)
1851 {
1852         struct v4l2_subdev *sd = media_entity_to_v4l2_subdev(entity);
1853         struct csi_priv *priv = v4l2_get_subdevdata(sd);
1854         struct fwnode_handle *csi_port = dev_fwnode(priv->dev);
1855         struct fwnode_handle *csi_ep;
1856         int ret;
1857
1858         csi_ep = fwnode_get_next_child_node(csi_port, NULL);
1859
1860         ret = endpoint->local_fwnode == csi_ep ? CSI_SINK_PAD : -ENXIO;
1861
1862         fwnode_handle_put(csi_ep);
1863
1864         return ret;
1865 }
1866
1867 static const struct media_entity_operations csi_entity_ops = {
1868         .link_setup = csi_link_setup,
1869         .link_validate = v4l2_subdev_link_validate,
1870         .get_fwnode_pad = csi_get_fwnode_pad,
1871 };
1872
1873 static const struct v4l2_subdev_core_ops csi_core_ops = {
1874         .subscribe_event = csi_subscribe_event,
1875         .unsubscribe_event = csi_unsubscribe_event,
1876 };
1877
1878 static const struct v4l2_subdev_video_ops csi_video_ops = {
1879         .s_stream = csi_s_stream,
1880 };
1881
1882 static const struct v4l2_subdev_pad_ops csi_pad_ops = {
1883         .enum_mbus_code = csi_enum_mbus_code,
1884         .enum_frame_size = csi_enum_frame_size,
1885         .enum_frame_interval = csi_enum_frame_interval,
1886         .get_fmt = csi_get_fmt,
1887         .set_fmt = csi_set_fmt,
1888         .get_selection = csi_get_selection,
1889         .set_selection = csi_set_selection,
1890         .get_frame_interval = csi_get_frame_interval,
1891         .set_frame_interval = csi_set_frame_interval,
1892         .link_validate = csi_link_validate,
1893 };
1894
1895 static const struct v4l2_subdev_ops csi_subdev_ops = {
1896         .core = &csi_core_ops,
1897         .video = &csi_video_ops,
1898         .pad = &csi_pad_ops,
1899 };
1900
1901 static const struct v4l2_subdev_internal_ops csi_internal_ops = {
1902         .init_state = imx_media_init_state,
1903         .registered = csi_registered,
1904         .unregistered = csi_unregistered,
1905 };
1906
1907 static int imx_csi_notify_bound(struct v4l2_async_notifier *notifier,
1908                                 struct v4l2_subdev *sd,
1909                                 struct v4l2_async_connection *asd)
1910 {
1911         struct csi_priv *priv = notifier_to_dev(notifier);
1912         struct media_pad *sink = &priv->sd.entity.pads[CSI_SINK_PAD];
1913
1914         /*
1915          * If the subdev is a video mux, it must be one of the CSI
1916          * muxes. Mark it as such via its group id.
1917          */
1918         if (sd->entity.function == MEDIA_ENT_F_VID_MUX)
1919                 sd->grp_id = IMX_MEDIA_GRP_ID_CSI_MUX;
1920
1921         return v4l2_create_fwnode_links_to_pad(sd, sink, 0);
1922 }
1923
1924 static const struct v4l2_async_notifier_operations csi_notify_ops = {
1925         .bound = imx_csi_notify_bound,
1926 };
1927
1928 static int imx_csi_async_register(struct csi_priv *priv)
1929 {
1930         struct v4l2_async_connection *asd = NULL;
1931         struct fwnode_handle *ep;
1932         unsigned int port;
1933         int ret;
1934
1935         v4l2_async_subdev_nf_init(&priv->notifier, &priv->sd);
1936
1937         /* get this CSI's port id */
1938         ret = fwnode_property_read_u32(dev_fwnode(priv->dev), "reg", &port);
1939         if (ret < 0)
1940                 return ret;
1941
1942         ep = fwnode_graph_get_endpoint_by_id(dev_fwnode(priv->dev->parent),
1943                                              port, 0,
1944                                              FWNODE_GRAPH_ENDPOINT_NEXT);
1945         if (ep) {
1946                 asd = v4l2_async_nf_add_fwnode_remote(&priv->notifier, ep,
1947                                                       struct v4l2_async_connection);
1948
1949                 fwnode_handle_put(ep);
1950
1951                 if (IS_ERR(asd)) {
1952                         ret = PTR_ERR(asd);
1953                         /* OK if asd already exists */
1954                         if (ret != -EEXIST)
1955                                 return ret;
1956                 }
1957         }
1958
1959         priv->notifier.ops = &csi_notify_ops;
1960
1961         ret = v4l2_async_nf_register(&priv->notifier);
1962         if (ret)
1963                 return ret;
1964
1965         return v4l2_async_register_subdev(&priv->sd);
1966 }
1967
1968 static int imx_csi_probe(struct platform_device *pdev)
1969 {
1970         struct ipu_client_platformdata *pdata;
1971         struct pinctrl *pinctrl;
1972         struct csi_priv *priv;
1973         int i, ret;
1974
1975         priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL);
1976         if (!priv)
1977                 return -ENOMEM;
1978
1979         platform_set_drvdata(pdev, &priv->sd);
1980         priv->dev = &pdev->dev;
1981
1982         ret = dma_set_coherent_mask(priv->dev, DMA_BIT_MASK(32));
1983         if (ret)
1984                 return ret;
1985
1986         /* get parent IPU */
1987         priv->ipu = dev_get_drvdata(priv->dev->parent);
1988
1989         /* get our CSI id */
1990         pdata = priv->dev->platform_data;
1991         priv->csi_id = pdata->csi;
1992         priv->smfc_id = (priv->csi_id == 0) ? 0 : 2;
1993
1994         priv->active_output_pad = CSI_SRC_PAD_IDMAC;
1995
1996         timer_setup(&priv->eof_timeout_timer, csi_idmac_eof_timeout, 0);
1997         spin_lock_init(&priv->irqlock);
1998
1999         v4l2_subdev_init(&priv->sd, &csi_subdev_ops);
2000         v4l2_set_subdevdata(&priv->sd, priv);
2001         priv->sd.internal_ops = &csi_internal_ops;
2002         priv->sd.entity.ops = &csi_entity_ops;
2003         priv->sd.entity.function = MEDIA_ENT_F_PROC_VIDEO_PIXEL_FORMATTER;
2004         priv->sd.dev = &pdev->dev;
2005         priv->sd.fwnode = of_fwnode_handle(pdata->of_node);
2006         priv->sd.owner = THIS_MODULE;
2007         priv->sd.flags = V4L2_SUBDEV_FL_HAS_DEVNODE | V4L2_SUBDEV_FL_HAS_EVENTS;
2008         priv->sd.grp_id = priv->csi_id ?
2009                 IMX_MEDIA_GRP_ID_IPU_CSI1 : IMX_MEDIA_GRP_ID_IPU_CSI0;
2010         imx_media_grp_id_to_sd_name(priv->sd.name, sizeof(priv->sd.name),
2011                                     priv->sd.grp_id, ipu_get_num(priv->ipu));
2012
2013         for (i = 0; i < CSI_NUM_PADS; i++)
2014                 priv->pad[i].flags = (i == CSI_SINK_PAD) ?
2015                         MEDIA_PAD_FL_SINK : MEDIA_PAD_FL_SOURCE;
2016
2017         ret = media_entity_pads_init(&priv->sd.entity, CSI_NUM_PADS,
2018                                      priv->pad);
2019         if (ret)
2020                 return ret;
2021
2022         mutex_init(&priv->lock);
2023
2024         v4l2_ctrl_handler_init(&priv->ctrl_hdlr, 0);
2025         priv->sd.ctrl_handler = &priv->ctrl_hdlr;
2026
2027         /*
2028          * The IPUv3 driver did not assign an of_node to this
2029          * device. As a result, pinctrl does not automatically
2030          * configure our pin groups, so we need to do that manually
2031          * here, after setting this device's of_node.
2032          */
2033         priv->dev->of_node = pdata->of_node;
2034         pinctrl = devm_pinctrl_get_select_default(priv->dev);
2035         if (IS_ERR(pinctrl)) {
2036                 ret = PTR_ERR(pinctrl);
2037                 dev_dbg(priv->dev,
2038                         "devm_pinctrl_get_select_default() failed: %d\n", ret);
2039                 if (ret != -ENODEV)
2040                         goto free;
2041         }
2042
2043         ret = imx_csi_async_register(priv);
2044         if (ret)
2045                 goto cleanup;
2046
2047         return 0;
2048
2049 cleanup:
2050         v4l2_async_nf_unregister(&priv->notifier);
2051         v4l2_async_nf_cleanup(&priv->notifier);
2052 free:
2053         v4l2_ctrl_handler_free(&priv->ctrl_hdlr);
2054         mutex_destroy(&priv->lock);
2055         return ret;
2056 }
2057
2058 static void imx_csi_remove(struct platform_device *pdev)
2059 {
2060         struct v4l2_subdev *sd = platform_get_drvdata(pdev);
2061         struct csi_priv *priv = sd_to_dev(sd);
2062
2063         v4l2_ctrl_handler_free(&priv->ctrl_hdlr);
2064         mutex_destroy(&priv->lock);
2065         v4l2_async_nf_unregister(&priv->notifier);
2066         v4l2_async_nf_cleanup(&priv->notifier);
2067         v4l2_async_unregister_subdev(sd);
2068         media_entity_cleanup(&sd->entity);
2069 }
2070
2071 static const struct platform_device_id imx_csi_ids[] = {
2072         { .name = "imx-ipuv3-csi" },
2073         { },
2074 };
2075 MODULE_DEVICE_TABLE(platform, imx_csi_ids);
2076
2077 static struct platform_driver imx_csi_driver = {
2078         .probe = imx_csi_probe,
2079         .remove_new = imx_csi_remove,
2080         .id_table = imx_csi_ids,
2081         .driver = {
2082                 .name = "imx-ipuv3-csi",
2083         },
2084 };
2085 module_platform_driver(imx_csi_driver);
2086
2087 MODULE_DESCRIPTION("i.MX CSI subdev driver");
2088 MODULE_AUTHOR("Steve Longerbeam <steve_longerbeam@mentor.com>");
2089 MODULE_LICENSE("GPL");