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       176
  37 #define MIN_H       144
  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         /* the video device at IDMAC output pad */
  62         struct imx_media_video_dev *vdev;
  63         struct imx_media_fim *fim;
  64         int csi_id;
  65         int smfc_id;
  66
  67         /* lock to protect all members below */
  68         struct mutex lock;
  69
  70         int active_output_pad;
  71
  72         struct ipuv3_channel *idmac_ch;
  73         struct ipu_smfc *smfc;
  74         struct ipu_csi *csi;
  75
  76         struct v4l2_mbus_framefmt format_mbus[CSI_NUM_PADS];
  77         const struct imx_media_pixfmt *cc[CSI_NUM_PADS];
  78         struct v4l2_fract frame_interval[CSI_NUM_PADS];
  79         struct v4l2_rect crop;
  80         struct v4l2_rect compose;
  81         const struct csi_skip_desc *skip;
  82
  83         /* active vb2 buffers to send to video dev sink */
  84         struct imx_media_buffer *active_vb2_buf[2];
  85         struct imx_media_dma_buf underrun_buf;
  86
  87         int ipu_buf_num;  /* ipu double buffer index: 0-1 */
  88
  89         /* the sink for the captured frames */
  90         struct media_entity *sink;
  91         enum ipu_csi_dest dest;
  92         /* the source subdev */
  93         struct v4l2_subdev *src_sd;
  94
  95         /* the mipi virtual channel number at link validate */
  96         int vc_num;
  97
  98         /* the upstream endpoint CSI is receiving from */
  99         struct v4l2_fwnode_endpoint upstream_ep;
 100
 101         spinlock_t irqlock; /* protect eof_irq handler */
 102         struct timer_list eof_timeout_timer;
 103         int eof_irq;
 104         int nfb4eof_irq;
 105
 106         struct v4l2_ctrl_handler ctrl_hdlr;
 107
 108         int stream_count; /* streaming counter */
 109         u32 frame_sequence; /* frame sequence counter */
 110         bool last_eof;   /* waiting for last EOF at stream off */
 111         bool nfb4eof;    /* NFB4EOF encountered during streaming */
 112         bool interweave_swap; /* swap top/bottom lines when interweaving */
 113         struct completion last_eof_comp;
 114 };
 115
 116 static inline struct csi_priv *sd_to_dev(struct v4l2_subdev *sdev)
 117 {
 118         return container_of(sdev, struct csi_priv, sd);
 119 }
 120
 121 static inline bool is_parallel_bus(struct v4l2_fwnode_endpoint *ep)
 122 {
 123         return ep->bus_type != V4L2_MBUS_CSI2_DPHY;
 124 }
 125
 126 static inline bool is_parallel_16bit_bus(struct v4l2_fwnode_endpoint *ep)
 127 {
 128         return is_parallel_bus(ep) && ep->bus.parallel.bus_width >= 16;
 129 }
 130
 131 /*
 132  * Check for conditions that require the IPU to handle the
 133  * data internally as generic data, aka passthrough mode:
 134  * - raw bayer media bus formats, or
 135  * - the CSI is receiving from a 16-bit parallel bus, or
 136  * - the CSI is receiving from an 8-bit parallel bus and the incoming
 137  *   media bus format is other than UYVY8_2X8/YUYV8_2X8.
 138  */
 139 static inline bool requires_passthrough(struct v4l2_fwnode_endpoint *ep,
 140                                         struct v4l2_mbus_framefmt *infmt,
 141                                         const struct imx_media_pixfmt *incc)
 142 {
 143         return incc->bayer || is_parallel_16bit_bus(ep) ||
 144                 (is_parallel_bus(ep) &&
 145                  infmt->code != MEDIA_BUS_FMT_UYVY8_2X8 &&
 146                  infmt->code != MEDIA_BUS_FMT_YUYV8_2X8);
 147 }
 148
 149 /*
 150  * Parses the fwnode endpoint from the source pad of the entity
 151  * connected to this CSI. This will either be the entity directly
 152  * upstream from the CSI-2 receiver, directly upstream from the
 153  * video mux, or directly upstream from the CSI itself. The endpoint
 154  * is needed to determine the bus type and bus config coming into
 155  * the CSI.
 156  */
 157 static int csi_get_upstream_endpoint(struct csi_priv *priv,
 158                                      struct v4l2_fwnode_endpoint *ep)
 159 {
 160         struct device_node *endpoint, *port;
 161         struct media_entity *src;
 162         struct v4l2_subdev *sd;
 163         struct media_pad *pad;
 164
 165         if (!IS_ENABLED(CONFIG_OF))
 166                 return -ENXIO;
 167
 168         if (!priv->src_sd)
 169                 return -EPIPE;
 170
 171         sd = priv->src_sd;
 172         src = &sd->entity;
 173
 174         if (src->function == MEDIA_ENT_F_VID_MUX) {
 175                 /*
 176                  * CSI is connected directly to video mux, skip up to
 177                  * CSI-2 receiver if it is in the path, otherwise stay
 178                  * with video mux.
 179                  */
 180                 sd = imx_media_pipeline_subdev(src, IMX_MEDIA_GRP_ID_CSI2,
 181                                                true);
 182                 if (!IS_ERR(sd))
 183                         src = &sd->entity;
 184         }
 185
 186         /*
 187          * If the source is neither the video mux nor the CSI-2 receiver,
 188          * get the source pad directly upstream from CSI itself.
 189          */
 190         if (src->function != MEDIA_ENT_F_VID_MUX &&
 191             sd->grp_id != IMX_MEDIA_GRP_ID_CSI2)
 192                 src = &priv->sd.entity;
 193
 194         /* get source pad of entity directly upstream from src */
 195         pad = imx_media_pipeline_pad(src, 0, 0, true);
 196         if (!pad)
 197                 return -ENODEV;
 198
 199         sd = media_entity_to_v4l2_subdev(pad->entity);
 200
 201         /*
 202          * NOTE: this assumes an OF-graph port id is the same as a
 203          * media pad index.
 204          */
 205         port = of_graph_get_port_by_id(sd->dev->of_node, pad->index);
 206         if (!port)
 207                 return -ENODEV;
 208
 209         endpoint = of_get_next_child(port, NULL);
 210         of_node_put(port);
 211         if (!endpoint)
 212                 return -ENODEV;
 213
 214         v4l2_fwnode_endpoint_parse(of_fwnode_handle(endpoint), ep);
 215         of_node_put(endpoint);
 216
 217         return 0;
 218 }
 219
 220 static void csi_idmac_put_ipu_resources(struct csi_priv *priv)
 221 {
 222         if (priv->idmac_ch)
 223                 ipu_idmac_put(priv->idmac_ch);
 224         priv->idmac_ch = NULL;
 225
 226         if (priv->smfc)
 227                 ipu_smfc_put(priv->smfc);
 228         priv->smfc = NULL;
 229 }
 230
 231 static int csi_idmac_get_ipu_resources(struct csi_priv *priv)
 232 {
 233         int ch_num, ret;
 234         struct ipu_smfc *smfc;
 235         struct ipuv3_channel *idmac_ch;
 236
 237         ch_num = IPUV3_CHANNEL_CSI0 + priv->smfc_id;
 238
 239         smfc = ipu_smfc_get(priv->ipu, ch_num);
 240         if (IS_ERR(smfc)) {
 241                 v4l2_err(&priv->sd, "failed to get SMFC\n");
 242                 ret = PTR_ERR(smfc);
 243                 goto out;
 244         }
 245         priv->smfc = smfc;
 246
 247         idmac_ch = ipu_idmac_get(priv->ipu, ch_num);
 248         if (IS_ERR(idmac_ch)) {
 249                 v4l2_err(&priv->sd, "could not get IDMAC channel %u\n",
 250                          ch_num);
 251                 ret = PTR_ERR(idmac_ch);
 252                 goto out;
 253         }
 254         priv->idmac_ch = idmac_ch;
 255
 256         return 0;
 257 out:
 258         csi_idmac_put_ipu_resources(priv);
 259         return ret;
 260 }
 261
 262 static void csi_vb2_buf_done(struct csi_priv *priv)
 263 {
 264         struct imx_media_video_dev *vdev = priv->vdev;
 265         struct imx_media_buffer *done, *next;
 266         struct vb2_buffer *vb;
 267         dma_addr_t phys;
 268
 269         done = priv->active_vb2_buf[priv->ipu_buf_num];
 270         if (done) {
 271                 done->vbuf.field = vdev->fmt.fmt.pix.field;
 272                 done->vbuf.sequence = priv->frame_sequence;
 273                 vb = &done->vbuf.vb2_buf;
 274                 vb->timestamp = ktime_get_ns();
 275                 vb2_buffer_done(vb, priv->nfb4eof ?
 276                                 VB2_BUF_STATE_ERROR : VB2_BUF_STATE_DONE);
 277         }
 278
 279         priv->frame_sequence++;
 280         priv->nfb4eof = false;
 281
 282         /* get next queued buffer */
 283         next = imx_media_capture_device_next_buf(vdev);
 284         if (next) {
 285                 phys = vb2_dma_contig_plane_dma_addr(&next->vbuf.vb2_buf, 0);
 286                 priv->active_vb2_buf[priv->ipu_buf_num] = next;
 287         } else {
 288                 phys = priv->underrun_buf.phys;
 289                 priv->active_vb2_buf[priv->ipu_buf_num] = NULL;
 290         }
 291
 292         if (ipu_idmac_buffer_is_ready(priv->idmac_ch, priv->ipu_buf_num))
 293                 ipu_idmac_clear_buffer(priv->idmac_ch, priv->ipu_buf_num);
 294
 295         if (priv->interweave_swap)
 296                 phys += vdev->fmt.fmt.pix.bytesperline;
 297
 298         ipu_cpmem_set_buffer(priv->idmac_ch, priv->ipu_buf_num, phys);
 299 }
 300
 301 static irqreturn_t csi_idmac_eof_interrupt(int irq, void *dev_id)
 302 {
 303         struct csi_priv *priv = dev_id;
 304
 305         spin_lock(&priv->irqlock);
 306
 307         if (priv->last_eof) {
 308                 complete(&priv->last_eof_comp);
 309                 priv->last_eof = false;
 310                 goto unlock;
 311         }
 312
 313         if (priv->fim)
 314                 /* call frame interval monitor */
 315                 imx_media_fim_eof_monitor(priv->fim, ktime_get());
 316
 317         csi_vb2_buf_done(priv);
 318
 319         /* select new IPU buf */
 320         ipu_idmac_select_buffer(priv->idmac_ch, priv->ipu_buf_num);
 321         /* toggle IPU double-buffer index */
 322         priv->ipu_buf_num ^= 1;
 323
 324         /* bump the EOF timeout timer */
 325         mod_timer(&priv->eof_timeout_timer,
 326                   jiffies + msecs_to_jiffies(IMX_MEDIA_EOF_TIMEOUT));
 327
 328 unlock:
 329         spin_unlock(&priv->irqlock);
 330         return IRQ_HANDLED;
 331 }
 332
 333 static irqreturn_t csi_idmac_nfb4eof_interrupt(int irq, void *dev_id)
 334 {
 335         struct csi_priv *priv = dev_id;
 336
 337         spin_lock(&priv->irqlock);
 338
 339         /*
 340          * this is not an unrecoverable error, just mark
 341          * the next captured frame with vb2 error flag.
 342          */
 343         priv->nfb4eof = true;
 344
 345         v4l2_err(&priv->sd, "NFB4EOF\n");
 346
 347         spin_unlock(&priv->irqlock);
 348
 349         return IRQ_HANDLED;
 350 }
 351
 352 /*
 353  * EOF timeout timer function. This is an unrecoverable condition
 354  * without a stream restart.
 355  */
 356 static void csi_idmac_eof_timeout(struct timer_list *t)
 357 {
 358         struct csi_priv *priv = from_timer(priv, t, eof_timeout_timer);
 359         struct imx_media_video_dev *vdev = priv->vdev;
 360
 361         v4l2_err(&priv->sd, "EOF timeout\n");
 362
 363         /* signal a fatal error to capture device */
 364         imx_media_capture_device_error(vdev);
 365 }
 366
 367 static void csi_idmac_setup_vb2_buf(struct csi_priv *priv, dma_addr_t *phys)
 368 {
 369         struct imx_media_video_dev *vdev = priv->vdev;
 370         struct imx_media_buffer *buf;
 371         int i;
 372
 373         for (i = 0; i < 2; i++) {
 374                 buf = imx_media_capture_device_next_buf(vdev);
 375                 if (buf) {
 376                         priv->active_vb2_buf[i] = buf;
 377                         phys[i] = vb2_dma_contig_plane_dma_addr(
 378                                 &buf->vbuf.vb2_buf, 0);
 379                 } else {
 380                         priv->active_vb2_buf[i] = NULL;
 381                         phys[i] = priv->underrun_buf.phys;
 382                 }
 383         }
 384 }
 385
 386 static void csi_idmac_unsetup_vb2_buf(struct csi_priv *priv,
 387                                       enum vb2_buffer_state return_status)
 388 {
 389         struct imx_media_buffer *buf;
 390         int i;
 391
 392         /* return any remaining active frames with return_status */
 393         for (i = 0; i < 2; i++) {
 394                 buf = priv->active_vb2_buf[i];
 395                 if (buf) {
 396                         struct vb2_buffer *vb = &buf->vbuf.vb2_buf;
 397
 398                         vb->timestamp = ktime_get_ns();
 399                         vb2_buffer_done(vb, return_status);
 400                 }
 401         }
 402 }
 403
 404 /* init the SMFC IDMAC channel */
 405 static int csi_idmac_setup_channel(struct csi_priv *priv)
 406 {
 407         struct imx_media_video_dev *vdev = priv->vdev;
 408         const struct imx_media_pixfmt *incc;
 409         struct v4l2_mbus_framefmt *infmt;
 410         struct v4l2_mbus_framefmt *outfmt;
 411         bool passthrough, interweave;
 412         struct ipu_image image;
 413         u32 passthrough_bits;
 414         u32 passthrough_cycles;
 415         dma_addr_t phys[2];
 416         u32 burst_size;
 417         int ret;
 418
 419         infmt = &priv->format_mbus[CSI_SINK_PAD];
 420         incc = priv->cc[CSI_SINK_PAD];
 421         outfmt = &priv->format_mbus[CSI_SRC_PAD_IDMAC];
 422
 423         ipu_cpmem_zero(priv->idmac_ch);
 424
 425         memset(&image, 0, sizeof(image));
 426         image.pix = vdev->fmt.fmt.pix;
 427         image.rect = vdev->compose;
 428
 429         csi_idmac_setup_vb2_buf(priv, phys);
 430
 431         image.phys0 = phys[0];
 432         image.phys1 = phys[1];
 433
 434         passthrough = requires_passthrough(&priv->upstream_ep, infmt, incc);
 435         passthrough_cycles = 1;
 436
 437         /*
 438          * If the field type at capture interface is interlaced, and
 439          * the output IDMAC pad is sequential, enable interweave at
 440          * the IDMAC output channel.
 441          */
 442         interweave = V4L2_FIELD_IS_INTERLACED(image.pix.field) &&
 443                 V4L2_FIELD_IS_SEQUENTIAL(outfmt->field);
 444         priv->interweave_swap = interweave &&
 445                 image.pix.field == V4L2_FIELD_INTERLACED_BT;
 446
 447         switch (image.pix.pixelformat) {
 448         case V4L2_PIX_FMT_SBGGR8:
 449         case V4L2_PIX_FMT_SGBRG8:
 450         case V4L2_PIX_FMT_SGRBG8:
 451         case V4L2_PIX_FMT_SRGGB8:
 452         case V4L2_PIX_FMT_GREY:
 453                 burst_size = 16;
 454                 passthrough_bits = 8;
 455                 break;
 456         case V4L2_PIX_FMT_SBGGR16:
 457         case V4L2_PIX_FMT_SGBRG16:
 458         case V4L2_PIX_FMT_SGRBG16:
 459         case V4L2_PIX_FMT_SRGGB16:
 460         case V4L2_PIX_FMT_Y16:
 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, CS_SEL_ANY, true);
1237
1238         switch (code->pad) {
1239         case CSI_SINK_PAD:
1240                 ret = imx_media_enum_mbus_format(&code->code, code->index,
1241                                                  CS_SEL_ANY, true);
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                         u32 cs_sel = (incc->cs == IPUV3_COLORSPACE_YUV) ?
1259                                 CS_SEL_YUV : CS_SEL_RGB;
1260                         ret = imx_media_enum_ipu_format(&code->code,
1261                                                         code->index,
1262                                                         cs_sel);
1263                 }
1264                 break;
1265         default:
1266                 ret = -EINVAL;
1267         }
1268
1269 out:
1270         mutex_unlock(&priv->lock);
1271         return ret;
1272 }
1273
1274 static int csi_enum_frame_size(struct v4l2_subdev *sd,
1275                                struct v4l2_subdev_pad_config *cfg,
1276                                struct v4l2_subdev_frame_size_enum *fse)
1277 {
1278         struct csi_priv *priv = v4l2_get_subdevdata(sd);
1279         struct v4l2_rect *crop;
1280         int ret = 0;
1281
1282         if (fse->pad >= CSI_NUM_PADS ||
1283             fse->index > (fse->pad == CSI_SINK_PAD ? 0 : 3))
1284                 return -EINVAL;
1285
1286         mutex_lock(&priv->lock);
1287
1288         if (fse->pad == CSI_SINK_PAD) {
1289                 fse->min_width = MIN_W;
1290                 fse->max_width = MAX_W;
1291                 fse->min_height = MIN_H;
1292                 fse->max_height = MAX_H;
1293         } else {
1294                 crop = __csi_get_crop(priv, cfg, fse->which);
1295
1296                 fse->min_width = fse->index & 1 ?
1297                         crop->width / 2 : crop->width;
1298                 fse->max_width = fse->min_width;
1299                 fse->min_height = fse->index & 2 ?
1300                         crop->height / 2 : crop->height;
1301                 fse->max_height = fse->min_height;
1302         }
1303
1304         mutex_unlock(&priv->lock);
1305         return ret;
1306 }
1307
1308 static int csi_enum_frame_interval(struct v4l2_subdev *sd,
1309                                    struct v4l2_subdev_pad_config *cfg,
1310                                    struct v4l2_subdev_frame_interval_enum *fie)
1311 {
1312         struct csi_priv *priv = v4l2_get_subdevdata(sd);
1313         struct v4l2_fract *input_fi;
1314         struct v4l2_rect *crop;
1315         int ret = 0;
1316
1317         if (fie->pad >= CSI_NUM_PADS ||
1318             fie->index >= (fie->pad != CSI_SRC_PAD_IDMAC ?
1319                            1 : ARRAY_SIZE(csi_skip)))
1320                 return -EINVAL;
1321
1322         mutex_lock(&priv->lock);
1323
1324         input_fi = &priv->frame_interval[CSI_SINK_PAD];
1325         crop = __csi_get_crop(priv, cfg, fie->which);
1326
1327         if ((fie->width != crop->width && fie->width != crop->width / 2) ||
1328             (fie->height != crop->height && fie->height != crop->height / 2)) {
1329                 ret = -EINVAL;
1330                 goto out;
1331         }
1332
1333         fie->interval = *input_fi;
1334
1335         if (fie->pad == CSI_SRC_PAD_IDMAC)
1336                 csi_apply_skip_interval(&csi_skip[fie->index],
1337                                         &fie->interval);
1338
1339 out:
1340         mutex_unlock(&priv->lock);
1341         return ret;
1342 }
1343
1344 static int csi_get_fmt(struct v4l2_subdev *sd,
1345                        struct v4l2_subdev_pad_config *cfg,
1346                        struct v4l2_subdev_format *sdformat)
1347 {
1348         struct csi_priv *priv = v4l2_get_subdevdata(sd);
1349         struct v4l2_mbus_framefmt *fmt;
1350         int ret = 0;
1351
1352         if (sdformat->pad >= CSI_NUM_PADS)
1353                 return -EINVAL;
1354
1355         mutex_lock(&priv->lock);
1356
1357         fmt = __csi_get_fmt(priv, cfg, sdformat->pad, sdformat->which);
1358         if (!fmt) {
1359                 ret = -EINVAL;
1360                 goto out;
1361         }
1362
1363         sdformat->format = *fmt;
1364 out:
1365         mutex_unlock(&priv->lock);
1366         return ret;
1367 }
1368
1369 static void csi_try_field(struct csi_priv *priv,
1370                           struct v4l2_subdev_pad_config *cfg,
1371                           struct v4l2_subdev_format *sdformat)
1372 {
1373         struct v4l2_mbus_framefmt *infmt =
1374                 __csi_get_fmt(priv, cfg, CSI_SINK_PAD, sdformat->which);
1375
1376         /* no restrictions on sink pad field type */
1377         if (sdformat->pad == CSI_SINK_PAD)
1378                 return;
1379
1380         switch (infmt->field) {
1381         case V4L2_FIELD_SEQ_TB:
1382         case V4L2_FIELD_SEQ_BT:
1383                 /*
1384                  * If the user requests sequential at the source pad,
1385                  * allow it (along with possibly inverting field order).
1386                  * Otherwise passthrough the field type.
1387                  */
1388                 if (!V4L2_FIELD_IS_SEQUENTIAL(sdformat->format.field))
1389                         sdformat->format.field = infmt->field;
1390                 break;
1391         case V4L2_FIELD_ALTERNATE:
1392                 /*
1393                  * This driver does not support alternate field mode, and
1394                  * the CSI captures a whole frame, so the CSI never presents
1395                  * alternate mode at its source pads. If user has not
1396                  * already requested sequential, translate ALTERNATE at
1397                  * sink pad to SEQ_TB or SEQ_BT at the source pad depending
1398                  * on input height (assume NTSC BT order if 480 total active
1399                  * frame lines, otherwise PAL TB order).
1400                  */
1401                 if (!V4L2_FIELD_IS_SEQUENTIAL(sdformat->format.field))
1402                         sdformat->format.field = (infmt->height == 480 / 2) ?
1403                                 V4L2_FIELD_SEQ_BT : V4L2_FIELD_SEQ_TB;
1404                 break;
1405         default:
1406                 /* Passthrough for all other input field types */
1407                 sdformat->format.field = infmt->field;
1408                 break;
1409         }
1410 }
1411
1412 static void csi_try_fmt(struct csi_priv *priv,
1413                         struct v4l2_fwnode_endpoint *upstream_ep,
1414                         struct v4l2_subdev_pad_config *cfg,
1415                         struct v4l2_subdev_format *sdformat,
1416                         struct v4l2_rect *crop,
1417                         struct v4l2_rect *compose,
1418                         const struct imx_media_pixfmt **cc)
1419 {
1420         const struct imx_media_pixfmt *incc;
1421         struct v4l2_mbus_framefmt *infmt;
1422         u32 code;
1423
1424         infmt = __csi_get_fmt(priv, cfg, CSI_SINK_PAD, sdformat->which);
1425
1426         switch (sdformat->pad) {
1427         case CSI_SRC_PAD_DIRECT:
1428         case CSI_SRC_PAD_IDMAC:
1429                 incc = imx_media_find_mbus_format(infmt->code,
1430                                                   CS_SEL_ANY, true);
1431
1432                 sdformat->format.width = compose->width;
1433                 sdformat->format.height = compose->height;
1434
1435                 if (requires_passthrough(upstream_ep, infmt, incc)) {
1436                         sdformat->format.code = infmt->code;
1437                         *cc = incc;
1438                 } else {
1439                         u32 cs_sel = (incc->cs == IPUV3_COLORSPACE_YUV) ?
1440                                 CS_SEL_YUV : CS_SEL_RGB;
1441
1442                         *cc = imx_media_find_ipu_format(sdformat->format.code,
1443                                                         cs_sel);
1444                         if (!*cc) {
1445                                 imx_media_enum_ipu_format(&code, 0, cs_sel);
1446                                 *cc = imx_media_find_ipu_format(code, cs_sel);
1447                                 sdformat->format.code = (*cc)->codes[0];
1448                         }
1449                 }
1450
1451                 csi_try_field(priv, cfg, sdformat);
1452
1453                 /* propagate colorimetry from sink */
1454                 sdformat->format.colorspace = infmt->colorspace;
1455                 sdformat->format.xfer_func = infmt->xfer_func;
1456                 sdformat->format.quantization = infmt->quantization;
1457                 sdformat->format.ycbcr_enc = infmt->ycbcr_enc;
1458
1459                 break;
1460         case CSI_SINK_PAD:
1461                 v4l_bound_align_image(&sdformat->format.width, MIN_W, MAX_W,
1462                                       W_ALIGN, &sdformat->format.height,
1463                                       MIN_H, MAX_H, H_ALIGN, S_ALIGN);
1464
1465                 *cc = imx_media_find_mbus_format(sdformat->format.code,
1466                                                  CS_SEL_ANY, true);
1467                 if (!*cc) {
1468                         imx_media_enum_mbus_format(&code, 0,
1469                                                    CS_SEL_ANY, false);
1470                         *cc = imx_media_find_mbus_format(code,
1471                                                         CS_SEL_ANY, false);
1472                         sdformat->format.code = (*cc)->codes[0];
1473                 }
1474
1475                 csi_try_field(priv, cfg, sdformat);
1476
1477                 imx_media_fill_default_mbus_fields(
1478                         &sdformat->format, infmt,
1479                         priv->active_output_pad == CSI_SRC_PAD_DIRECT);
1480
1481                 /* Reset crop and compose rectangles */
1482                 crop->left = 0;
1483                 crop->top = 0;
1484                 crop->width = sdformat->format.width;
1485                 crop->height = sdformat->format.height;
1486                 if (sdformat->format.field == V4L2_FIELD_ALTERNATE)
1487                         crop->height *= 2;
1488                 csi_try_crop(priv, crop, cfg, &sdformat->format, upstream_ep);
1489                 compose->left = 0;
1490                 compose->top = 0;
1491                 compose->width = crop->width;
1492                 compose->height = crop->height;
1493
1494                 break;
1495         }
1496 }
1497
1498 static int csi_set_fmt(struct v4l2_subdev *sd,
1499                        struct v4l2_subdev_pad_config *cfg,
1500                        struct v4l2_subdev_format *sdformat)
1501 {
1502         struct csi_priv *priv = v4l2_get_subdevdata(sd);
1503         struct v4l2_fwnode_endpoint upstream_ep = { .bus_type = 0 };
1504         const struct imx_media_pixfmt *cc;
1505         struct v4l2_mbus_framefmt *fmt;
1506         struct v4l2_rect *crop, *compose;
1507         int ret;
1508
1509         if (sdformat->pad >= CSI_NUM_PADS)
1510                 return -EINVAL;
1511
1512         ret = csi_get_upstream_endpoint(priv, &upstream_ep);
1513         if (ret) {
1514                 v4l2_err(&priv->sd, "failed to find upstream endpoint\n");
1515                 return ret;
1516         }
1517
1518         mutex_lock(&priv->lock);
1519
1520         if (priv->stream_count > 0) {
1521                 ret = -EBUSY;
1522                 goto out;
1523         }
1524
1525         crop = __csi_get_crop(priv, cfg, sdformat->which);
1526         compose = __csi_get_compose(priv, cfg, sdformat->which);
1527
1528         csi_try_fmt(priv, &upstream_ep, cfg, sdformat, crop, compose, &cc);
1529
1530         fmt = __csi_get_fmt(priv, cfg, sdformat->pad, sdformat->which);
1531         *fmt = sdformat->format;
1532
1533         if (sdformat->pad == CSI_SINK_PAD) {
1534                 int pad;
1535
1536                 /* propagate format to source pads */
1537                 for (pad = CSI_SINK_PAD + 1; pad < CSI_NUM_PADS; pad++) {
1538                         const struct imx_media_pixfmt *outcc;
1539                         struct v4l2_mbus_framefmt *outfmt;
1540                         struct v4l2_subdev_format format;
1541
1542                         format.pad = pad;
1543                         format.which = sdformat->which;
1544                         format.format = sdformat->format;
1545                         csi_try_fmt(priv, &upstream_ep, cfg, &format,
1546                                     NULL, compose, &outcc);
1547
1548                         outfmt = __csi_get_fmt(priv, cfg, pad, sdformat->which);
1549                         *outfmt = format.format;
1550
1551                         if (sdformat->which == V4L2_SUBDEV_FORMAT_ACTIVE)
1552                                 priv->cc[pad] = outcc;
1553                 }
1554         }
1555
1556         if (sdformat->which == V4L2_SUBDEV_FORMAT_ACTIVE)
1557                 priv->cc[sdformat->pad] = cc;
1558
1559 out:
1560         mutex_unlock(&priv->lock);
1561         return ret;
1562 }
1563
1564 static int csi_get_selection(struct v4l2_subdev *sd,
1565                              struct v4l2_subdev_pad_config *cfg,
1566                              struct v4l2_subdev_selection *sel)
1567 {
1568         struct csi_priv *priv = v4l2_get_subdevdata(sd);
1569         struct v4l2_mbus_framefmt *infmt;
1570         struct v4l2_rect *crop, *compose;
1571         int ret = 0;
1572
1573         if (sel->pad != CSI_SINK_PAD)
1574                 return -EINVAL;
1575
1576         mutex_lock(&priv->lock);
1577
1578         infmt = __csi_get_fmt(priv, cfg, CSI_SINK_PAD, sel->which);
1579         crop = __csi_get_crop(priv, cfg, sel->which);
1580         compose = __csi_get_compose(priv, cfg, sel->which);
1581
1582         switch (sel->target) {
1583         case V4L2_SEL_TGT_CROP_BOUNDS:
1584                 sel->r.left = 0;
1585                 sel->r.top = 0;
1586                 sel->r.width = infmt->width;
1587                 sel->r.height = infmt->height;
1588                 if (infmt->field == V4L2_FIELD_ALTERNATE)
1589                         sel->r.height *= 2;
1590                 break;
1591         case V4L2_SEL_TGT_CROP:
1592                 sel->r = *crop;
1593                 break;
1594         case V4L2_SEL_TGT_COMPOSE_BOUNDS:
1595                 sel->r.left = 0;
1596                 sel->r.top = 0;
1597                 sel->r.width = crop->width;
1598                 sel->r.height = crop->height;
1599                 break;
1600         case V4L2_SEL_TGT_COMPOSE:
1601                 sel->r = *compose;
1602                 break;
1603         default:
1604                 ret = -EINVAL;
1605         }
1606
1607         mutex_unlock(&priv->lock);
1608         return ret;
1609 }
1610
1611 static int csi_set_scale(u32 *compose, u32 crop, u32 flags)
1612 {
1613         if ((flags & (V4L2_SEL_FLAG_LE | V4L2_SEL_FLAG_GE)) ==
1614                      (V4L2_SEL_FLAG_LE | V4L2_SEL_FLAG_GE) &&
1615             *compose != crop && *compose != crop / 2)
1616                 return -ERANGE;
1617
1618         if (*compose <= crop / 2 ||
1619             (*compose < crop * 3 / 4 && !(flags & V4L2_SEL_FLAG_GE)) ||
1620             (*compose < crop && (flags & V4L2_SEL_FLAG_LE)))
1621                 *compose = crop / 2;
1622         else
1623                 *compose = crop;
1624
1625         return 0;
1626 }
1627
1628 static int csi_set_selection(struct v4l2_subdev *sd,
1629                              struct v4l2_subdev_pad_config *cfg,
1630                              struct v4l2_subdev_selection *sel)
1631 {
1632         struct csi_priv *priv = v4l2_get_subdevdata(sd);
1633         struct v4l2_fwnode_endpoint upstream_ep = { .bus_type = 0 };
1634         struct v4l2_mbus_framefmt *infmt;
1635         struct v4l2_rect *crop, *compose;
1636         int pad, ret;
1637
1638         if (sel->pad != CSI_SINK_PAD)
1639                 return -EINVAL;
1640
1641         ret = csi_get_upstream_endpoint(priv, &upstream_ep);
1642         if (ret) {
1643                 v4l2_err(&priv->sd, "failed to find upstream endpoint\n");
1644                 return ret;
1645         }
1646
1647         mutex_lock(&priv->lock);
1648
1649         if (priv->stream_count > 0) {
1650                 ret = -EBUSY;
1651                 goto out;
1652         }
1653
1654         infmt = __csi_get_fmt(priv, cfg, CSI_SINK_PAD, sel->which);
1655         crop = __csi_get_crop(priv, cfg, sel->which);
1656         compose = __csi_get_compose(priv, cfg, sel->which);
1657
1658         switch (sel->target) {
1659         case V4L2_SEL_TGT_CROP:
1660                 /*
1661                  * Modifying the crop rectangle always changes the format on
1662                  * the source pads. If the KEEP_CONFIG flag is set, just return
1663                  * the current crop rectangle.
1664                  */
1665                 if (sel->flags & V4L2_SEL_FLAG_KEEP_CONFIG) {
1666                         sel->r = priv->crop;
1667                         if (sel->which == V4L2_SUBDEV_FORMAT_TRY)
1668                                 *crop = sel->r;
1669                         goto out;
1670                 }
1671
1672                 csi_try_crop(priv, &sel->r, cfg, infmt, &upstream_ep);
1673
1674                 *crop = sel->r;
1675
1676                 /* Reset scaling to 1:1 */
1677                 compose->width = crop->width;
1678                 compose->height = crop->height;
1679                 break;
1680         case V4L2_SEL_TGT_COMPOSE:
1681                 /*
1682                  * Modifying the compose rectangle always changes the format on
1683                  * the source pads. If the KEEP_CONFIG flag is set, just return
1684                  * the current compose rectangle.
1685                  */
1686                 if (sel->flags & V4L2_SEL_FLAG_KEEP_CONFIG) {
1687                         sel->r = priv->compose;
1688                         if (sel->which == V4L2_SUBDEV_FORMAT_TRY)
1689                                 *compose = sel->r;
1690                         goto out;
1691                 }
1692
1693                 sel->r.left = 0;
1694                 sel->r.top = 0;
1695                 ret = csi_set_scale(&sel->r.width, crop->width, sel->flags);
1696                 if (ret)
1697                         goto out;
1698                 ret = csi_set_scale(&sel->r.height, crop->height, sel->flags);
1699                 if (ret)
1700                         goto out;
1701
1702                 *compose = sel->r;
1703                 break;
1704         default:
1705                 ret = -EINVAL;
1706                 goto out;
1707         }
1708
1709         /* Reset source pads to sink compose rectangle */
1710         for (pad = CSI_SINK_PAD + 1; pad < CSI_NUM_PADS; pad++) {
1711                 struct v4l2_mbus_framefmt *outfmt;
1712
1713                 outfmt = __csi_get_fmt(priv, cfg, pad, sel->which);
1714                 outfmt->width = compose->width;
1715                 outfmt->height = compose->height;
1716         }
1717
1718 out:
1719         mutex_unlock(&priv->lock);
1720         return ret;
1721 }
1722
1723 static int csi_subscribe_event(struct v4l2_subdev *sd, struct v4l2_fh *fh,
1724                                struct v4l2_event_subscription *sub)
1725 {
1726         if (sub->type != V4L2_EVENT_IMX_FRAME_INTERVAL_ERROR)
1727                 return -EINVAL;
1728         if (sub->id != 0)
1729                 return -EINVAL;
1730
1731         return v4l2_event_subscribe(fh, sub, 0, NULL);
1732 }
1733
1734 static int csi_unsubscribe_event(struct v4l2_subdev *sd, struct v4l2_fh *fh,
1735                                  struct v4l2_event_subscription *sub)
1736 {
1737         return v4l2_event_unsubscribe(fh, sub);
1738 }
1739
1740 /*
1741  * retrieve our pads parsed from the OF graph by the media device
1742  */
1743 static int csi_registered(struct v4l2_subdev *sd)
1744 {
1745         struct csi_priv *priv = v4l2_get_subdevdata(sd);
1746         struct ipu_csi *csi;
1747         int i, ret;
1748         u32 code;
1749
1750         /* get handle to IPU CSI */
1751         csi = ipu_csi_get(priv->ipu, priv->csi_id);
1752         if (IS_ERR(csi)) {
1753                 v4l2_err(&priv->sd, "failed to get CSI%d\n", priv->csi_id);
1754                 return PTR_ERR(csi);
1755         }
1756         priv->csi = csi;
1757
1758         for (i = 0; i < CSI_NUM_PADS; i++) {
1759                 priv->pad[i].flags = (i == CSI_SINK_PAD) ?
1760                         MEDIA_PAD_FL_SINK : MEDIA_PAD_FL_SOURCE;
1761
1762                 code = 0;
1763                 if (i != CSI_SINK_PAD)
1764                         imx_media_enum_ipu_format(&code, 0, CS_SEL_YUV);
1765
1766                 /* set a default mbus format  */
1767                 ret = imx_media_init_mbus_fmt(&priv->format_mbus[i],
1768                                               640, 480, code, V4L2_FIELD_NONE,
1769                                               &priv->cc[i]);
1770                 if (ret)
1771                         goto put_csi;
1772
1773                 /* init default frame interval */
1774                 priv->frame_interval[i].numerator = 1;
1775                 priv->frame_interval[i].denominator = 30;
1776         }
1777
1778         /* disable frame skipping */
1779         priv->skip = &csi_skip[0];
1780
1781         /* init default crop and compose rectangle sizes */
1782         priv->crop.width = 640;
1783         priv->crop.height = 480;
1784         priv->compose.width = 640;
1785         priv->compose.height = 480;
1786
1787         priv->fim = imx_media_fim_init(&priv->sd);
1788         if (IS_ERR(priv->fim)) {
1789                 ret = PTR_ERR(priv->fim);
1790                 goto put_csi;
1791         }
1792
1793         ret = media_entity_pads_init(&sd->entity, CSI_NUM_PADS, priv->pad);
1794         if (ret)
1795                 goto free_fim;
1796
1797         ret = imx_media_capture_device_register(priv->vdev);
1798         if (ret)
1799                 goto free_fim;
1800
1801         return 0;
1802
1803 free_fim:
1804         if (priv->fim)
1805                 imx_media_fim_free(priv->fim);
1806 put_csi:
1807         ipu_csi_put(priv->csi);
1808         return ret;
1809 }
1810
1811 static void csi_unregistered(struct v4l2_subdev *sd)
1812 {
1813         struct csi_priv *priv = v4l2_get_subdevdata(sd);
1814
1815         imx_media_capture_device_unregister(priv->vdev);
1816
1817         if (priv->fim)
1818                 imx_media_fim_free(priv->fim);
1819
1820         if (priv->csi)
1821                 ipu_csi_put(priv->csi);
1822 }
1823
1824 static const struct media_entity_operations csi_entity_ops = {
1825         .link_setup = csi_link_setup,
1826         .link_validate = v4l2_subdev_link_validate,
1827 };
1828
1829 static const struct v4l2_subdev_core_ops csi_core_ops = {
1830         .subscribe_event = csi_subscribe_event,
1831         .unsubscribe_event = csi_unsubscribe_event,
1832 };
1833
1834 static const struct v4l2_subdev_video_ops csi_video_ops = {
1835         .g_frame_interval = csi_g_frame_interval,
1836         .s_frame_interval = csi_s_frame_interval,
1837         .s_stream = csi_s_stream,
1838 };
1839
1840 static const struct v4l2_subdev_pad_ops csi_pad_ops = {
1841         .init_cfg = imx_media_init_cfg,
1842         .enum_mbus_code = csi_enum_mbus_code,
1843         .enum_frame_size = csi_enum_frame_size,
1844         .enum_frame_interval = csi_enum_frame_interval,
1845         .get_fmt = csi_get_fmt,
1846         .set_fmt = csi_set_fmt,
1847         .get_selection = csi_get_selection,
1848         .set_selection = csi_set_selection,
1849         .link_validate = csi_link_validate,
1850 };
1851
1852 static const struct v4l2_subdev_ops csi_subdev_ops = {
1853         .core = &csi_core_ops,
1854         .video = &csi_video_ops,
1855         .pad = &csi_pad_ops,
1856 };
1857
1858 static const struct v4l2_subdev_internal_ops csi_internal_ops = {
1859         .registered = csi_registered,
1860         .unregistered = csi_unregistered,
1861 };
1862
1863 static int imx_csi_parse_endpoint(struct device *dev,
1864                                   struct v4l2_fwnode_endpoint *vep,
1865                                   struct v4l2_async_subdev *asd)
1866 {
1867         return fwnode_device_is_available(asd->match.fwnode) ? 0 : -ENOTCONN;
1868 }
1869
1870 static int imx_csi_async_register(struct csi_priv *priv)
1871 {
1872         struct v4l2_async_notifier *notifier;
1873         struct fwnode_handle *fwnode;
1874         unsigned int port;
1875         int ret;
1876
1877         notifier = kzalloc(sizeof(*notifier), GFP_KERNEL);
1878         if (!notifier)
1879                 return -ENOMEM;
1880
1881         v4l2_async_notifier_init(notifier);
1882
1883         fwnode = dev_fwnode(priv->dev);
1884
1885         /* get this CSI's port id */
1886         ret = fwnode_property_read_u32(fwnode, "reg", &port);
1887         if (ret < 0)
1888                 goto out_free;
1889
1890         ret = v4l2_async_notifier_parse_fwnode_endpoints_by_port(
1891                 priv->dev->parent, notifier, sizeof(struct v4l2_async_subdev),
1892                 port, imx_csi_parse_endpoint);
1893         if (ret < 0)
1894                 goto out_cleanup;
1895
1896         ret = v4l2_async_subdev_notifier_register(&priv->sd, notifier);
1897         if (ret < 0)
1898                 goto out_cleanup;
1899
1900         ret = v4l2_async_register_subdev(&priv->sd);
1901         if (ret < 0)
1902                 goto out_unregister;
1903
1904         priv->sd.subdev_notifier = notifier;
1905
1906         return 0;
1907
1908 out_unregister:
1909         v4l2_async_notifier_unregister(notifier);
1910 out_cleanup:
1911         v4l2_async_notifier_cleanup(notifier);
1912 out_free:
1913         kfree(notifier);
1914
1915         return ret;
1916 }
1917
1918 static int imx_csi_probe(struct platform_device *pdev)
1919 {
1920         struct ipu_client_platformdata *pdata;
1921         struct pinctrl *pinctrl;
1922         struct csi_priv *priv;
1923         int ret;
1924
1925         priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL);
1926         if (!priv)
1927                 return -ENOMEM;
1928
1929         platform_set_drvdata(pdev, &priv->sd);
1930         priv->dev = &pdev->dev;
1931
1932         ret = dma_set_coherent_mask(priv->dev, DMA_BIT_MASK(32));
1933         if (ret)
1934                 return ret;
1935
1936         /* get parent IPU */
1937         priv->ipu = dev_get_drvdata(priv->dev->parent);
1938
1939         /* get our CSI id */
1940         pdata = priv->dev->platform_data;
1941         priv->csi_id = pdata->csi;
1942         priv->smfc_id = (priv->csi_id == 0) ? 0 : 2;
1943
1944         priv->active_output_pad = CSI_SRC_PAD_IDMAC;
1945
1946         timer_setup(&priv->eof_timeout_timer, csi_idmac_eof_timeout, 0);
1947         spin_lock_init(&priv->irqlock);
1948
1949         v4l2_subdev_init(&priv->sd, &csi_subdev_ops);
1950         v4l2_set_subdevdata(&priv->sd, priv);
1951         priv->sd.internal_ops = &csi_internal_ops;
1952         priv->sd.entity.ops = &csi_entity_ops;
1953         priv->sd.entity.function = MEDIA_ENT_F_PROC_VIDEO_PIXEL_FORMATTER;
1954         priv->sd.dev = &pdev->dev;
1955         priv->sd.fwnode = of_fwnode_handle(pdata->of_node);
1956         priv->sd.owner = THIS_MODULE;
1957         priv->sd.flags = V4L2_SUBDEV_FL_HAS_DEVNODE | V4L2_SUBDEV_FL_HAS_EVENTS;
1958         priv->sd.grp_id = priv->csi_id ?
1959                 IMX_MEDIA_GRP_ID_IPU_CSI1 : IMX_MEDIA_GRP_ID_IPU_CSI0;
1960         imx_media_grp_id_to_sd_name(priv->sd.name, sizeof(priv->sd.name),
1961                                     priv->sd.grp_id, ipu_get_num(priv->ipu));
1962
1963         priv->vdev = imx_media_capture_device_init(priv->sd.dev, &priv->sd,
1964                                                    CSI_SRC_PAD_IDMAC);
1965         if (IS_ERR(priv->vdev))
1966                 return PTR_ERR(priv->vdev);
1967
1968         mutex_init(&priv->lock);
1969
1970         v4l2_ctrl_handler_init(&priv->ctrl_hdlr, 0);
1971         priv->sd.ctrl_handler = &priv->ctrl_hdlr;
1972
1973         /*
1974          * The IPUv3 driver did not assign an of_node to this
1975          * device. As a result, pinctrl does not automatically
1976          * configure our pin groups, so we need to do that manually
1977          * here, after setting this device's of_node.
1978          */
1979         priv->dev->of_node = pdata->of_node;
1980         pinctrl = devm_pinctrl_get_select_default(priv->dev);
1981         if (IS_ERR(pinctrl)) {
1982                 ret = PTR_ERR(pinctrl);
1983                 dev_dbg(priv->dev,
1984                         "devm_pinctrl_get_select_default() failed: %d\n", ret);
1985                 if (ret != -ENODEV)
1986                         goto free;
1987         }
1988
1989         ret = imx_csi_async_register(priv);
1990         if (ret)
1991                 goto free;
1992
1993         return 0;
1994 free:
1995         v4l2_ctrl_handler_free(&priv->ctrl_hdlr);
1996         mutex_destroy(&priv->lock);
1997         imx_media_capture_device_remove(priv->vdev);
1998         return ret;
1999 }
2000
2001 static int imx_csi_remove(struct platform_device *pdev)
2002 {
2003         struct v4l2_subdev *sd = platform_get_drvdata(pdev);
2004         struct csi_priv *priv = sd_to_dev(sd);
2005
2006         v4l2_ctrl_handler_free(&priv->ctrl_hdlr);
2007         mutex_destroy(&priv->lock);
2008         imx_media_capture_device_remove(priv->vdev);
2009         v4l2_async_unregister_subdev(sd);
2010         media_entity_cleanup(&sd->entity);
2011
2012         return 0;
2013 }
2014
2015 static const struct platform_device_id imx_csi_ids[] = {
2016         { .name = "imx-ipuv3-csi" },
2017         { },
2018 };
2019 MODULE_DEVICE_TABLE(platform, imx_csi_ids);
2020
2021 static struct platform_driver imx_csi_driver = {
2022         .probe = imx_csi_probe,
2023         .remove = imx_csi_remove,
2024         .id_table = imx_csi_ids,
2025         .driver = {
2026                 .name = "imx-ipuv3-csi",
2027         },
2028 };
2029 module_platform_driver(imx_csi_driver);
2030
2031 MODULE_DESCRIPTION("i.MX CSI subdev driver");
2032 MODULE_AUTHOR("Steve Longerbeam <steve_longerbeam@mentor.com>");
2033 MODULE_LICENSE("GPL");
2034 MODULE_ALIAS("platform:imx-ipuv3-csi");