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

   1 /*
   2  * V4L2 Capture CSI Subdev for Freescale i.MX5/6 SOC
   3  *
   4  * Copyright (c) 2014-2017 Mentor Graphics Inc.
   5  * Copyright (C) 2017 Pengutronix, Philipp Zabel <kernel@pengutronix.de>
   6  *
   7  * This program is free software; you can redistribute it and/or modify
   8  * it under the terms of the GNU General Public License as published by
   9  * the Free Software Foundation; either version 2 of the License, or
  10  * (at your option) any later version.
  11  */
  12 #include <linux/delay.h>
  13 #include <linux/gcd.h>
  14 #include <linux/interrupt.h>
  15 #include <linux/module.h>
  16 #include <linux/pinctrl/consumer.h>
  17 #include <linux/platform_device.h>
  18 #include <media/v4l2-ctrls.h>
  19 #include <media/v4l2-device.h>
  20 #include <media/v4l2-event.h>
  21 #include <media/v4l2-fwnode.h>
  22 #include <media/v4l2-mc.h>
  23 #include <media/v4l2-subdev.h>
  24 #include <media/videobuf2-dma-contig.h>
  25 #include <video/imx-ipu-v3.h>
  26 #include <media/imx.h>
  27 #include "imx-media.h"
  28
  29 /*
  30  * Min/Max supported width and heights.
  31  *
  32  * We allow planar output, so we have to align width by 16 pixels
  33  * to meet IDMAC alignment requirements.
  34  *
  35  * TODO: move this into pad format negotiation, if capture device
  36  * has not requested planar formats, we should allow 8 pixel
  37  * alignment.
  38  */
  39 #define MIN_W       176
  40 #define MIN_H       144
  41 #define MAX_W      4096
  42 #define MAX_H      4096
  43 #define W_ALIGN    4 /* multiple of 16 pixels */
  44 #define H_ALIGN    1 /* multiple of 2 lines */
  45 #define S_ALIGN    1 /* multiple of 2 */
  46
  47 /*
  48  * struct csi_skip_desc - CSI frame skipping descriptor
  49  * @keep - number of frames kept per max_ratio frames
  50  * @max_ratio - width of skip_smfc, written to MAX_RATIO bitfield
  51  * @skip_smfc - skip pattern written to the SKIP_SMFC bitfield
  52  */
  53 struct csi_skip_desc {
  54         u8 keep;
  55         u8 max_ratio;
  56         u8 skip_smfc;
  57 };
  58
  59 struct csi_priv {
  60         struct device *dev;
  61         struct ipu_soc *ipu;
  62         struct imx_media_dev *md;
  63         struct v4l2_subdev sd;
  64         struct media_pad pad[CSI_NUM_PADS];
  65         /* the video device at IDMAC output pad */
  66         struct imx_media_video_dev *vdev;
  67         struct imx_media_fim *fim;
  68         int csi_id;
  69         int smfc_id;
  70
  71         /* lock to protect all members below */
  72         struct mutex lock;
  73
  74         int active_output_pad;
  75
  76         struct ipuv3_channel *idmac_ch;
  77         struct ipu_smfc *smfc;
  78         struct ipu_csi *csi;
  79
  80         struct v4l2_mbus_framefmt format_mbus[CSI_NUM_PADS];
  81         const struct imx_media_pixfmt *cc[CSI_NUM_PADS];
  82         struct v4l2_fract frame_interval[CSI_NUM_PADS];
  83         struct v4l2_rect crop;
  84         struct v4l2_rect compose;
  85         const struct csi_skip_desc *skip;
  86
  87         /* active vb2 buffers to send to video dev sink */
  88         struct imx_media_buffer *active_vb2_buf[2];
  89         struct imx_media_dma_buf underrun_buf;
  90
  91         int ipu_buf_num;  /* ipu double buffer index: 0-1 */
  92
  93         /* the sink for the captured frames */
  94         struct media_entity *sink;
  95         enum ipu_csi_dest dest;
  96         /* the source subdev */
  97         struct v4l2_subdev *src_sd;
  98
  99         /* the mipi virtual channel number at link validate */
 100         int vc_num;
 101
 102         /* the attached sensor at stream on */
 103         struct imx_media_subdev *sensor;
 104
 105         spinlock_t irqlock; /* protect eof_irq handler */
 106         struct timer_list eof_timeout_timer;
 107         int eof_irq;
 108         int nfb4eof_irq;
 109
 110         struct v4l2_ctrl_handler ctrl_hdlr;
 111
 112         int stream_count; /* streaming counter */
 113         bool last_eof;   /* waiting for last EOF at stream off */
 114         bool nfb4eof;    /* NFB4EOF encountered during streaming */
 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 void csi_idmac_put_ipu_resources(struct csi_priv *priv)
 124 {
 125         if (priv->idmac_ch)
 126                 ipu_idmac_put(priv->idmac_ch);
 127         priv->idmac_ch = NULL;
 128
 129         if (priv->smfc)
 130                 ipu_smfc_put(priv->smfc);
 131         priv->smfc = NULL;
 132 }
 133
 134 static int csi_idmac_get_ipu_resources(struct csi_priv *priv)
 135 {
 136         int ch_num, ret;
 137         struct ipu_smfc *smfc;
 138         struct ipuv3_channel *idmac_ch;
 139
 140         ch_num = IPUV3_CHANNEL_CSI0 + priv->smfc_id;
 141
 142         smfc = ipu_smfc_get(priv->ipu, ch_num);
 143         if (IS_ERR(smfc)) {
 144                 v4l2_err(&priv->sd, "failed to get SMFC\n");
 145                 ret = PTR_ERR(smfc);
 146                 goto out;
 147         }
 148         priv->smfc = smfc;
 149
 150         idmac_ch = ipu_idmac_get(priv->ipu, ch_num);
 151         if (IS_ERR(idmac_ch)) {
 152                 v4l2_err(&priv->sd, "could not get IDMAC channel %u\n",
 153                          ch_num);
 154                 ret = PTR_ERR(idmac_ch);
 155                 goto out;
 156         }
 157         priv->idmac_ch = idmac_ch;
 158
 159         return 0;
 160 out:
 161         csi_idmac_put_ipu_resources(priv);
 162         return ret;
 163 }
 164
 165 static void csi_vb2_buf_done(struct csi_priv *priv)
 166 {
 167         struct imx_media_video_dev *vdev = priv->vdev;
 168         struct imx_media_buffer *done, *next;
 169         struct vb2_buffer *vb;
 170         dma_addr_t phys;
 171
 172         done = priv->active_vb2_buf[priv->ipu_buf_num];
 173         if (done) {
 174                 done->vbuf.field = vdev->fmt.fmt.pix.field;
 175                 vb = &done->vbuf.vb2_buf;
 176                 vb->timestamp = ktime_get_ns();
 177                 vb2_buffer_done(vb, priv->nfb4eof ?
 178                                 VB2_BUF_STATE_ERROR : VB2_BUF_STATE_DONE);
 179         }
 180
 181         priv->nfb4eof = false;
 182
 183         /* get next queued buffer */
 184         next = imx_media_capture_device_next_buf(vdev);
 185         if (next) {
 186                 phys = vb2_dma_contig_plane_dma_addr(&next->vbuf.vb2_buf, 0);
 187                 priv->active_vb2_buf[priv->ipu_buf_num] = next;
 188         } else {
 189                 phys = priv->underrun_buf.phys;
 190                 priv->active_vb2_buf[priv->ipu_buf_num] = NULL;
 191         }
 192
 193         if (ipu_idmac_buffer_is_ready(priv->idmac_ch, priv->ipu_buf_num))
 194                 ipu_idmac_clear_buffer(priv->idmac_ch, priv->ipu_buf_num);
 195
 196         ipu_cpmem_set_buffer(priv->idmac_ch, priv->ipu_buf_num, phys);
 197 }
 198
 199 static irqreturn_t csi_idmac_eof_interrupt(int irq, void *dev_id)
 200 {
 201         struct csi_priv *priv = dev_id;
 202
 203         spin_lock(&priv->irqlock);
 204
 205         if (priv->last_eof) {
 206                 complete(&priv->last_eof_comp);
 207                 priv->last_eof = false;
 208                 goto unlock;
 209         }
 210
 211         if (priv->fim) {
 212                 struct timespec cur_ts;
 213
 214                 ktime_get_ts(&cur_ts);
 215                 /* call frame interval monitor */
 216                 imx_media_fim_eof_monitor(priv->fim, &cur_ts);
 217         }
 218
 219         csi_vb2_buf_done(priv);
 220
 221         /* select new IPU buf */
 222         ipu_idmac_select_buffer(priv->idmac_ch, priv->ipu_buf_num);
 223         /* toggle IPU double-buffer index */
 224         priv->ipu_buf_num ^= 1;
 225
 226         /* bump the EOF timeout timer */
 227         mod_timer(&priv->eof_timeout_timer,
 228                   jiffies + msecs_to_jiffies(IMX_MEDIA_EOF_TIMEOUT));
 229
 230 unlock:
 231         spin_unlock(&priv->irqlock);
 232         return IRQ_HANDLED;
 233 }
 234
 235 static irqreturn_t csi_idmac_nfb4eof_interrupt(int irq, void *dev_id)
 236 {
 237         struct csi_priv *priv = dev_id;
 238
 239         spin_lock(&priv->irqlock);
 240
 241         /*
 242          * this is not an unrecoverable error, just mark
 243          * the next captured frame with vb2 error flag.
 244          */
 245         priv->nfb4eof = true;
 246
 247         v4l2_err(&priv->sd, "NFB4EOF\n");
 248
 249         spin_unlock(&priv->irqlock);
 250
 251         return IRQ_HANDLED;
 252 }
 253
 254 /*
 255  * EOF timeout timer function. This is an unrecoverable condition
 256  * without a stream restart.
 257  */
 258 static void csi_idmac_eof_timeout(unsigned long data)
 259 {
 260         struct csi_priv *priv = (struct csi_priv *)data;
 261         struct imx_media_video_dev *vdev = priv->vdev;
 262
 263         v4l2_err(&priv->sd, "EOF timeout\n");
 264
 265         /* signal a fatal error to capture device */
 266         imx_media_capture_device_error(vdev);
 267 }
 268
 269 static void csi_idmac_setup_vb2_buf(struct csi_priv *priv, dma_addr_t *phys)
 270 {
 271         struct imx_media_video_dev *vdev = priv->vdev;
 272         struct imx_media_buffer *buf;
 273         int i;
 274
 275         for (i = 0; i < 2; i++) {
 276                 buf = imx_media_capture_device_next_buf(vdev);
 277                 if (buf) {
 278                         priv->active_vb2_buf[i] = buf;
 279                         phys[i] = vb2_dma_contig_plane_dma_addr(
 280                                 &buf->vbuf.vb2_buf, 0);
 281                 } else {
 282                         priv->active_vb2_buf[i] = NULL;
 283                         phys[i] = priv->underrun_buf.phys;
 284                 }
 285         }
 286 }
 287
 288 static void csi_idmac_unsetup_vb2_buf(struct csi_priv *priv,
 289                                       enum vb2_buffer_state return_status)
 290 {
 291         struct imx_media_buffer *buf;
 292         int i;
 293
 294         /* return any remaining active frames with return_status */
 295         for (i = 0; i < 2; i++) {
 296                 buf = priv->active_vb2_buf[i];
 297                 if (buf) {
 298                         struct vb2_buffer *vb = &buf->vbuf.vb2_buf;
 299
 300                         vb->timestamp = ktime_get_ns();
 301                         vb2_buffer_done(vb, return_status);
 302                 }
 303         }
 304 }
 305
 306 /* init the SMFC IDMAC channel */
 307 static int csi_idmac_setup_channel(struct csi_priv *priv)
 308 {
 309         struct imx_media_video_dev *vdev = priv->vdev;
 310         struct v4l2_fwnode_endpoint *sensor_ep;
 311         struct v4l2_mbus_framefmt *infmt;
 312         struct ipu_image image;
 313         u32 passthrough_bits;
 314         dma_addr_t phys[2];
 315         bool passthrough;
 316         u32 burst_size;
 317         int ret;
 318
 319         infmt = &priv->format_mbus[CSI_SINK_PAD];
 320         sensor_ep = &priv->sensor->sensor_ep;
 321
 322         ipu_cpmem_zero(priv->idmac_ch);
 323
 324         memset(&image, 0, sizeof(image));
 325         image.pix = vdev->fmt.fmt.pix;
 326         image.rect.width = image.pix.width;
 327         image.rect.height = image.pix.height;
 328
 329         csi_idmac_setup_vb2_buf(priv, phys);
 330
 331         image.phys0 = phys[0];
 332         image.phys1 = phys[1];
 333
 334         /*
 335          * Check for conditions that require the IPU to handle the
 336          * data internally as generic data, aka passthrough mode:
 337          * - raw bayer formats
 338          * - the sensor bus is 16-bit parallel
 339          */
 340         switch (image.pix.pixelformat) {
 341         case V4L2_PIX_FMT_SBGGR8:
 342         case V4L2_PIX_FMT_SGBRG8:
 343         case V4L2_PIX_FMT_SGRBG8:
 344         case V4L2_PIX_FMT_SRGGB8:
 345                 burst_size = 8;
 346                 passthrough = true;
 347                 passthrough_bits = 8;
 348                 break;
 349         case V4L2_PIX_FMT_SBGGR16:
 350         case V4L2_PIX_FMT_SGBRG16:
 351         case V4L2_PIX_FMT_SGRBG16:
 352         case V4L2_PIX_FMT_SRGGB16:
 353                 burst_size = 4;
 354                 passthrough = true;
 355                 passthrough_bits = 16;
 356                 break;
 357         case V4L2_PIX_FMT_YUV420:
 358         case V4L2_PIX_FMT_NV12:
 359                 burst_size = (image.pix.width & 0x3f) ?
 360                              ((image.pix.width & 0x1f) ?
 361                               ((image.pix.width & 0xf) ? 8 : 16) : 32) : 64;
 362                 passthrough = (sensor_ep->bus_type != V4L2_MBUS_CSI2 &&
 363                                sensor_ep->bus.parallel.bus_width >= 16);
 364                 passthrough_bits = 16;
 365                 /* Skip writing U and V components to odd rows */
 366                 ipu_cpmem_skip_odd_chroma_rows(priv->idmac_ch);
 367                 break;
 368         case V4L2_PIX_FMT_YUYV:
 369         case V4L2_PIX_FMT_UYVY:
 370                 burst_size = (image.pix.width & 0x1f) ?
 371                              ((image.pix.width & 0xf) ? 8 : 16) : 32;
 372                 passthrough = (sensor_ep->bus_type != V4L2_MBUS_CSI2 &&
 373                                sensor_ep->bus.parallel.bus_width >= 16);
 374                 passthrough_bits = 16;
 375                 break;
 376         default:
 377                 burst_size = (image.pix.width & 0xf) ? 8 : 16;
 378                 passthrough = (sensor_ep->bus_type != V4L2_MBUS_CSI2 &&
 379                                sensor_ep->bus.parallel.bus_width >= 16);
 380                 passthrough_bits = 16;
 381                 break;
 382         }
 383
 384         if (passthrough) {
 385                 ipu_cpmem_set_resolution(priv->idmac_ch, image.rect.width,
 386                                          image.rect.height);
 387                 ipu_cpmem_set_stride(priv->idmac_ch, image.pix.bytesperline);
 388                 ipu_cpmem_set_buffer(priv->idmac_ch, 0, image.phys0);
 389                 ipu_cpmem_set_buffer(priv->idmac_ch, 1, image.phys1);
 390                 ipu_cpmem_set_format_passthrough(priv->idmac_ch,
 391                                                  passthrough_bits);
 392         } else {
 393                 ret = ipu_cpmem_set_image(priv->idmac_ch, &image);
 394                 if (ret)
 395                         goto unsetup_vb2;
 396         }
 397
 398         ipu_cpmem_set_burstsize(priv->idmac_ch, burst_size);
 399
 400         /*
 401          * Set the channel for the direct CSI-->memory via SMFC
 402          * use-case to very high priority, by enabling the watermark
 403          * signal in the SMFC, enabling WM in the channel, and setting
 404          * the channel priority to high.
 405          *
 406          * Refer to the i.mx6 rev. D TRM Table 36-8: Calculated priority
 407          * value.
 408          *
 409          * The WM's are set very low by intention here to ensure that
 410          * the SMFC FIFOs do not overflow.
 411          */
 412         ipu_smfc_set_watermark(priv->smfc, 0x02, 0x01);
 413         ipu_cpmem_set_high_priority(priv->idmac_ch);
 414         ipu_idmac_enable_watermark(priv->idmac_ch, true);
 415         ipu_cpmem_set_axi_id(priv->idmac_ch, 0);
 416
 417         burst_size = passthrough ?
 418                 (burst_size >> 3) - 1 : (burst_size >> 2) - 1;
 419
 420         ipu_smfc_set_burstsize(priv->smfc, burst_size);
 421
 422         if (image.pix.field == V4L2_FIELD_NONE &&
 423             V4L2_FIELD_HAS_BOTH(infmt->field))
 424                 ipu_cpmem_interlaced_scan(priv->idmac_ch,
 425                                           image.pix.bytesperline);
 426
 427         ipu_idmac_set_double_buffer(priv->idmac_ch, true);
 428
 429         return 0;
 430
 431 unsetup_vb2:
 432         csi_idmac_unsetup_vb2_buf(priv, VB2_BUF_STATE_QUEUED);
 433         return ret;
 434 }
 435
 436 static void csi_idmac_unsetup(struct csi_priv *priv,
 437                               enum vb2_buffer_state state)
 438 {
 439         ipu_idmac_disable_channel(priv->idmac_ch);
 440         ipu_smfc_disable(priv->smfc);
 441
 442         csi_idmac_unsetup_vb2_buf(priv, state);
 443 }
 444
 445 static int csi_idmac_setup(struct csi_priv *priv)
 446 {
 447         int ret;
 448
 449         ret = csi_idmac_setup_channel(priv);
 450         if (ret)
 451                 return ret;
 452
 453         ipu_cpmem_dump(priv->idmac_ch);
 454         ipu_dump(priv->ipu);
 455
 456         ipu_smfc_enable(priv->smfc);
 457
 458         /* set buffers ready */
 459         ipu_idmac_select_buffer(priv->idmac_ch, 0);
 460         ipu_idmac_select_buffer(priv->idmac_ch, 1);
 461
 462         /* enable the channels */
 463         ipu_idmac_enable_channel(priv->idmac_ch);
 464
 465         return 0;
 466 }
 467
 468 static int csi_idmac_start(struct csi_priv *priv)
 469 {
 470         struct imx_media_video_dev *vdev = priv->vdev;
 471         struct v4l2_pix_format *outfmt;
 472         int ret;
 473
 474         ret = csi_idmac_get_ipu_resources(priv);
 475         if (ret)
 476                 return ret;
 477
 478         ipu_smfc_map_channel(priv->smfc, priv->csi_id, priv->vc_num);
 479
 480         outfmt = &vdev->fmt.fmt.pix;
 481
 482         ret = imx_media_alloc_dma_buf(priv->md, &priv->underrun_buf,
 483                                       outfmt->sizeimage);
 484         if (ret)
 485                 goto out_put_ipu;
 486
 487         priv->ipu_buf_num = 0;
 488
 489         /* init EOF completion waitq */
 490         init_completion(&priv->last_eof_comp);
 491         priv->last_eof = false;
 492         priv->nfb4eof = false;
 493
 494         ret = csi_idmac_setup(priv);
 495         if (ret) {
 496                 v4l2_err(&priv->sd, "csi_idmac_setup failed: %d\n", ret);
 497                 goto out_free_dma_buf;
 498         }
 499
 500         priv->nfb4eof_irq = ipu_idmac_channel_irq(priv->ipu,
 501                                                  priv->idmac_ch,
 502                                                  IPU_IRQ_NFB4EOF);
 503         ret = devm_request_irq(priv->dev, priv->nfb4eof_irq,
 504                                csi_idmac_nfb4eof_interrupt, 0,
 505                                "imx-smfc-nfb4eof", priv);
 506         if (ret) {
 507                 v4l2_err(&priv->sd,
 508                          "Error registering NFB4EOF irq: %d\n", ret);
 509                 goto out_unsetup;
 510         }
 511
 512         priv->eof_irq = ipu_idmac_channel_irq(priv->ipu, priv->idmac_ch,
 513                                               IPU_IRQ_EOF);
 514
 515         ret = devm_request_irq(priv->dev, priv->eof_irq,
 516                                csi_idmac_eof_interrupt, 0,
 517                                "imx-smfc-eof", priv);
 518         if (ret) {
 519                 v4l2_err(&priv->sd,
 520                          "Error registering eof irq: %d\n", ret);
 521                 goto out_free_nfb4eof_irq;
 522         }
 523
 524         /* start the EOF timeout timer */
 525         mod_timer(&priv->eof_timeout_timer,
 526                   jiffies + msecs_to_jiffies(IMX_MEDIA_EOF_TIMEOUT));
 527
 528         return 0;
 529
 530 out_free_nfb4eof_irq:
 531         devm_free_irq(priv->dev, priv->nfb4eof_irq, priv);
 532 out_unsetup:
 533         csi_idmac_unsetup(priv, VB2_BUF_STATE_QUEUED);
 534 out_free_dma_buf:
 535         imx_media_free_dma_buf(priv->md, &priv->underrun_buf);
 536 out_put_ipu:
 537         csi_idmac_put_ipu_resources(priv);
 538         return ret;
 539 }
 540
 541 static void csi_idmac_wait_last_eof(struct csi_priv *priv)
 542 {
 543         unsigned long flags;
 544         int ret;
 545
 546         /* mark next EOF interrupt as the last before stream off */
 547         spin_lock_irqsave(&priv->irqlock, flags);
 548         priv->last_eof = true;
 549         spin_unlock_irqrestore(&priv->irqlock, flags);
 550
 551         /*
 552          * and then wait for interrupt handler to mark completion.
 553          */
 554         ret = wait_for_completion_timeout(
 555                 &priv->last_eof_comp, msecs_to_jiffies(IMX_MEDIA_EOF_TIMEOUT));
 556         if (ret == 0)
 557                 v4l2_warn(&priv->sd, "wait last EOF timeout\n");
 558 }
 559
 560 static void csi_idmac_stop(struct csi_priv *priv)
 561 {
 562         devm_free_irq(priv->dev, priv->eof_irq, priv);
 563         devm_free_irq(priv->dev, priv->nfb4eof_irq, priv);
 564
 565         csi_idmac_unsetup(priv, VB2_BUF_STATE_ERROR);
 566
 567         imx_media_free_dma_buf(priv->md, &priv->underrun_buf);
 568
 569         /* cancel the EOF timeout timer */
 570         del_timer_sync(&priv->eof_timeout_timer);
 571
 572         csi_idmac_put_ipu_resources(priv);
 573 }
 574
 575 /* Update the CSI whole sensor and active windows */
 576 static int csi_setup(struct csi_priv *priv)
 577 {
 578         struct v4l2_mbus_framefmt *infmt, *outfmt;
 579         struct v4l2_mbus_config sensor_mbus_cfg;
 580         struct v4l2_fwnode_endpoint *sensor_ep;
 581         struct v4l2_mbus_framefmt if_fmt;
 582
 583         infmt = &priv->format_mbus[CSI_SINK_PAD];
 584         outfmt = &priv->format_mbus[priv->active_output_pad];
 585         sensor_ep = &priv->sensor->sensor_ep;
 586
 587         /* compose mbus_config from sensor endpoint */
 588         sensor_mbus_cfg.type = sensor_ep->bus_type;
 589         sensor_mbus_cfg.flags = (sensor_ep->bus_type == V4L2_MBUS_CSI2) ?
 590                 sensor_ep->bus.mipi_csi2.flags :
 591                 sensor_ep->bus.parallel.flags;
 592
 593         /*
 594          * we need to pass input sensor frame to CSI interface, but
 595          * with translated field type from output format
 596          */
 597         if_fmt = *infmt;
 598         if_fmt.field = outfmt->field;
 599
 600         ipu_csi_set_window(priv->csi, &priv->crop);
 601
 602         ipu_csi_set_downsize(priv->csi,
 603                              priv->crop.width == 2 * priv->compose.width,
 604                              priv->crop.height == 2 * priv->compose.height);
 605
 606         ipu_csi_init_interface(priv->csi, &sensor_mbus_cfg, &if_fmt);
 607
 608         ipu_csi_set_dest(priv->csi, priv->dest);
 609
 610         if (priv->dest == IPU_CSI_DEST_IDMAC)
 611                 ipu_csi_set_skip_smfc(priv->csi, priv->skip->skip_smfc,
 612                                       priv->skip->max_ratio - 1, 0);
 613
 614         ipu_csi_dump(priv->csi);
 615
 616         return 0;
 617 }
 618
 619 static int csi_start(struct csi_priv *priv)
 620 {
 621         struct v4l2_fract *output_fi, *input_fi;
 622         u32 bad_frames = 0;
 623         int ret;
 624
 625         if (!priv->sensor) {
 626                 v4l2_err(&priv->sd, "no sensor attached\n");
 627                 return -EINVAL;
 628         }
 629
 630         output_fi = &priv->frame_interval[priv->active_output_pad];
 631         input_fi = &priv->frame_interval[CSI_SINK_PAD];
 632
 633         ret = v4l2_subdev_call(priv->sensor->sd, sensor,
 634                                g_skip_frames, &bad_frames);
 635         if (!ret && bad_frames) {
 636                 u32 delay_usec;
 637
 638                 /*
 639                  * This sensor has bad frames when it is turned on,
 640                  * add a delay to avoid them before enabling the CSI
 641                  * hardware. Especially for sensors with a bt.656 interface,
 642                  * any shifts in the SAV/EAV sync codes will cause the CSI
 643                  * to lose vert/horiz sync.
 644                  */
 645                 delay_usec = DIV_ROUND_UP_ULL(
 646                         (u64)USEC_PER_SEC * input_fi->numerator * bad_frames,
 647                         input_fi->denominator);
 648                 usleep_range(delay_usec, delay_usec + 1000);
 649         }
 650
 651         /* start upstream */
 652         ret = v4l2_subdev_call(priv->src_sd, video, s_stream, 1);
 653         ret = (ret && ret != -ENOIOCTLCMD) ? ret : 0;
 654         if (ret)
 655                 return ret;
 656
 657         if (priv->dest == IPU_CSI_DEST_IDMAC) {
 658                 ret = csi_idmac_start(priv);
 659                 if (ret)
 660                         goto stop_upstream;
 661         }
 662
 663         ret = csi_setup(priv);
 664         if (ret)
 665                 goto idmac_stop;
 666
 667         /* start the frame interval monitor */
 668         if (priv->fim && priv->dest == IPU_CSI_DEST_IDMAC) {
 669                 ret = imx_media_fim_set_stream(priv->fim, output_fi, true);
 670                 if (ret)
 671                         goto idmac_stop;
 672         }
 673
 674         ret = ipu_csi_enable(priv->csi);
 675         if (ret) {
 676                 v4l2_err(&priv->sd, "CSI enable error: %d\n", ret);
 677                 goto fim_off;
 678         }
 679
 680         return 0;
 681
 682 fim_off:
 683         if (priv->fim && priv->dest == IPU_CSI_DEST_IDMAC)
 684                 imx_media_fim_set_stream(priv->fim, NULL, false);
 685 idmac_stop:
 686         if (priv->dest == IPU_CSI_DEST_IDMAC)
 687                 csi_idmac_stop(priv);
 688 stop_upstream:
 689         v4l2_subdev_call(priv->src_sd, video, s_stream, 0);
 690         return ret;
 691 }
 692
 693 static void csi_stop(struct csi_priv *priv)
 694 {
 695         if (priv->dest == IPU_CSI_DEST_IDMAC)
 696                 csi_idmac_wait_last_eof(priv);
 697
 698         /*
 699          * Disable the CSI asap, after syncing with the last EOF.
 700          * Doing so after the IDMA channel is disabled has shown to
 701          * create hard system-wide hangs.
 702          */
 703         ipu_csi_disable(priv->csi);
 704
 705         /* stop upstream */
 706         v4l2_subdev_call(priv->src_sd, video, s_stream, 0);
 707
 708         if (priv->dest == IPU_CSI_DEST_IDMAC) {
 709                 csi_idmac_stop(priv);
 710
 711                 /* stop the frame interval monitor */
 712                 if (priv->fim)
 713                         imx_media_fim_set_stream(priv->fim, NULL, false);
 714         }
 715 }
 716
 717 static const struct csi_skip_desc csi_skip[12] = {
 718         { 1, 1, 0x00 }, /* Keep all frames */
 719         { 5, 6, 0x10 }, /* Skip every sixth frame */
 720         { 4, 5, 0x08 }, /* Skip every fifth frame */
 721         { 3, 4, 0x04 }, /* Skip every fourth frame */
 722         { 2, 3, 0x02 }, /* Skip every third frame */
 723         { 3, 5, 0x0a }, /* Skip frames 1 and 3 of every 5 */
 724         { 1, 2, 0x01 }, /* Skip every second frame */
 725         { 2, 5, 0x0b }, /* Keep frames 1 and 4 of every 5 */
 726         { 1, 3, 0x03 }, /* Keep one in three frames */
 727         { 1, 4, 0x07 }, /* Keep one in four frames */
 728         { 1, 5, 0x0f }, /* Keep one in five frames */
 729         { 1, 6, 0x1f }, /* Keep one in six frames */
 730 };
 731
 732 static void csi_apply_skip_interval(const struct csi_skip_desc *skip,
 733                                     struct v4l2_fract *interval)
 734 {
 735         unsigned int div;
 736
 737         interval->numerator *= skip->max_ratio;
 738         interval->denominator *= skip->keep;
 739
 740         /* Reduce fraction to lowest terms */
 741         div = gcd(interval->numerator, interval->denominator);
 742         if (div > 1) {
 743                 interval->numerator /= div;
 744                 interval->denominator /= div;
 745         }
 746 }
 747
 748 /*
 749  * Find the skip pattern to produce the output frame interval closest to the
 750  * requested one, for the given input frame interval. Updates the output frame
 751  * interval to the exact value.
 752  */
 753 static const struct csi_skip_desc *csi_find_best_skip(struct v4l2_fract *in,
 754                                                       struct v4l2_fract *out)
 755 {
 756         const struct csi_skip_desc *skip = &csi_skip[0], *best_skip = skip;
 757         u32 min_err = UINT_MAX;
 758         u64 want_us;
 759         int i;
 760
 761         /* Default to 1:1 ratio */
 762         if (out->numerator == 0 || out->denominator == 0 ||
 763             in->numerator == 0 || in->denominator == 0) {
 764                 *out = *in;
 765                 return best_skip;
 766         }
 767
 768         want_us = div_u64((u64)USEC_PER_SEC * out->numerator, out->denominator);
 769
 770         /* Find the reduction closest to the requested time per frame */
 771         for (i = 0; i < ARRAY_SIZE(csi_skip); i++, skip++) {
 772                 u64 tmp, err;
 773
 774                 tmp = div_u64((u64)USEC_PER_SEC * in->numerator *
 775                               skip->max_ratio, in->denominator * skip->keep);
 776
 777                 err = abs((s64)tmp - want_us);
 778                 if (err < min_err) {
 779                         min_err = err;
 780                         best_skip = skip;
 781                 }
 782         }
 783
 784         *out = *in;
 785         csi_apply_skip_interval(best_skip, out);
 786
 787         return best_skip;
 788 }
 789
 790 /*
 791  * V4L2 subdev operations.
 792  */
 793
 794 static int csi_g_frame_interval(struct v4l2_subdev *sd,
 795                                 struct v4l2_subdev_frame_interval *fi)
 796 {
 797         struct csi_priv *priv = v4l2_get_subdevdata(sd);
 798
 799         if (fi->pad >= CSI_NUM_PADS)
 800                 return -EINVAL;
 801
 802         mutex_lock(&priv->lock);
 803
 804         fi->interval = priv->frame_interval[fi->pad];
 805
 806         mutex_unlock(&priv->lock);
 807
 808         return 0;
 809 }
 810
 811 static int csi_s_frame_interval(struct v4l2_subdev *sd,
 812                                 struct v4l2_subdev_frame_interval *fi)
 813 {
 814         struct csi_priv *priv = v4l2_get_subdevdata(sd);
 815         struct v4l2_fract *input_fi;
 816         int ret = 0;
 817
 818         mutex_lock(&priv->lock);
 819
 820         input_fi = &priv->frame_interval[CSI_SINK_PAD];
 821
 822         switch (fi->pad) {
 823         case CSI_SINK_PAD:
 824                 /* No limits on input frame interval */
 825                 /* Reset output intervals and frame skipping ratio to 1:1 */
 826                 priv->frame_interval[CSI_SRC_PAD_IDMAC] = fi->interval;
 827                 priv->frame_interval[CSI_SRC_PAD_DIRECT] = fi->interval;
 828                 priv->skip = &csi_skip[0];
 829                 break;
 830         case CSI_SRC_PAD_IDMAC:
 831                 /*
 832                  * frame interval at IDMAC output pad depends on input
 833                  * interval, modified by frame skipping.
 834                  */
 835                 priv->skip = csi_find_best_skip(input_fi, &fi->interval);
 836                 break;
 837         case CSI_SRC_PAD_DIRECT:
 838                 /*
 839                  * frame interval at DIRECT output pad is same as input
 840                  * interval.
 841                  */
 842                 fi->interval = *input_fi;
 843                 break;
 844         default:
 845                 ret = -EINVAL;
 846                 goto out;
 847         }
 848
 849         priv->frame_interval[fi->pad] = fi->interval;
 850 out:
 851         mutex_unlock(&priv->lock);
 852         return ret;
 853 }
 854
 855 static int csi_s_stream(struct v4l2_subdev *sd, int enable)
 856 {
 857         struct csi_priv *priv = v4l2_get_subdevdata(sd);
 858         int ret = 0;
 859
 860         mutex_lock(&priv->lock);
 861
 862         if (!priv->src_sd || !priv->sink) {
 863                 ret = -EPIPE;
 864                 goto out;
 865         }
 866
 867         /*
 868          * enable/disable streaming only if stream_count is
 869          * going from 0 to 1 / 1 to 0.
 870          */
 871         if (priv->stream_count != !enable)
 872                 goto update_count;
 873
 874         if (enable) {
 875                 dev_dbg(priv->dev, "stream ON\n");
 876                 ret = csi_start(priv);
 877                 if (ret)
 878                         goto out;
 879         } else {
 880                 dev_dbg(priv->dev, "stream OFF\n");
 881                 csi_stop(priv);
 882         }
 883
 884 update_count:
 885         priv->stream_count += enable ? 1 : -1;
 886         if (priv->stream_count < 0)
 887                 priv->stream_count = 0;
 888 out:
 889         mutex_unlock(&priv->lock);
 890         return ret;
 891 }
 892
 893 static int csi_link_setup(struct media_entity *entity,
 894                           const struct media_pad *local,
 895                           const struct media_pad *remote, u32 flags)
 896 {
 897         struct v4l2_subdev *sd = media_entity_to_v4l2_subdev(entity);
 898         struct csi_priv *priv = v4l2_get_subdevdata(sd);
 899         struct v4l2_subdev *remote_sd;
 900         int ret = 0;
 901
 902         dev_dbg(priv->dev, "link setup %s -> %s\n", remote->entity->name,
 903                 local->entity->name);
 904
 905         mutex_lock(&priv->lock);
 906
 907         if (local->flags & MEDIA_PAD_FL_SINK) {
 908                 if (!is_media_entity_v4l2_subdev(remote->entity)) {
 909                         ret = -EINVAL;
 910                         goto out;
 911                 }
 912
 913                 remote_sd = media_entity_to_v4l2_subdev(remote->entity);
 914
 915                 if (flags & MEDIA_LNK_FL_ENABLED) {
 916                         if (priv->src_sd) {
 917                                 ret = -EBUSY;
 918                                 goto out;
 919                         }
 920                         priv->src_sd = remote_sd;
 921                 } else {
 922                         priv->src_sd = NULL;
 923                 }
 924
 925                 goto out;
 926         }
 927
 928         /* this is a source pad */
 929
 930         if (flags & MEDIA_LNK_FL_ENABLED) {
 931                 if (priv->sink) {
 932                         ret = -EBUSY;
 933                         goto out;
 934                 }
 935         } else {
 936                 v4l2_ctrl_handler_free(&priv->ctrl_hdlr);
 937                 v4l2_ctrl_handler_init(&priv->ctrl_hdlr, 0);
 938                 priv->sink = NULL;
 939                 goto out;
 940         }
 941
 942         /* record which output pad is now active */
 943         priv->active_output_pad = local->index;
 944
 945         /* set CSI destination */
 946         if (local->index == CSI_SRC_PAD_IDMAC) {
 947                 if (!is_media_entity_v4l2_video_device(remote->entity)) {
 948                         ret = -EINVAL;
 949                         goto out;
 950                 }
 951
 952                 if (priv->fim) {
 953                         ret = imx_media_fim_add_controls(priv->fim);
 954                         if (ret)
 955                                 goto out;
 956                 }
 957
 958                 priv->dest = IPU_CSI_DEST_IDMAC;
 959         } else {
 960                 if (!is_media_entity_v4l2_subdev(remote->entity)) {
 961                         ret = -EINVAL;
 962                         goto out;
 963                 }
 964
 965                 remote_sd = media_entity_to_v4l2_subdev(remote->entity);
 966                 switch (remote_sd->grp_id) {
 967                 case IMX_MEDIA_GRP_ID_VDIC:
 968                         priv->dest = IPU_CSI_DEST_VDIC;
 969                         break;
 970                 case IMX_MEDIA_GRP_ID_IC_PRP:
 971                         priv->dest = IPU_CSI_DEST_IC;
 972                         break;
 973                 default:
 974                         ret = -EINVAL;
 975                         goto out;
 976                 }
 977         }
 978
 979         priv->sink = remote->entity;
 980 out:
 981         mutex_unlock(&priv->lock);
 982         return ret;
 983 }
 984
 985 static int csi_link_validate(struct v4l2_subdev *sd,
 986                              struct media_link *link,
 987                              struct v4l2_subdev_format *source_fmt,
 988                              struct v4l2_subdev_format *sink_fmt)
 989 {
 990         struct csi_priv *priv = v4l2_get_subdevdata(sd);
 991         struct v4l2_fwnode_endpoint *sensor_ep;
 992         const struct imx_media_pixfmt *incc;
 993         struct imx_media_subdev *sensor;
 994         bool is_csi2;
 995         int ret;
 996
 997         ret = v4l2_subdev_link_validate_default(sd, link,
 998                                                 source_fmt, sink_fmt);
 999         if (ret)
1000                 return ret;
1001
1002         sensor = __imx_media_find_sensor(priv->md, &priv->sd.entity);
1003         if (IS_ERR(sensor)) {
1004                 v4l2_err(&priv->sd, "no sensor attached\n");
1005                 return PTR_ERR(priv->sensor);
1006         }
1007
1008         mutex_lock(&priv->lock);
1009
1010         priv->sensor = sensor;
1011         sensor_ep = &priv->sensor->sensor_ep;
1012         is_csi2 = (sensor_ep->bus_type == V4L2_MBUS_CSI2);
1013         incc = priv->cc[CSI_SINK_PAD];
1014
1015         if (priv->dest != IPU_CSI_DEST_IDMAC &&
1016             (incc->bayer || (!is_csi2 &&
1017                              sensor_ep->bus.parallel.bus_width >= 16))) {
1018                 v4l2_err(&priv->sd,
1019                          "bayer/16-bit parallel buses must go to IDMAC pad\n");
1020                 ret = -EINVAL;
1021                 goto out;
1022         }
1023
1024         if (is_csi2) {
1025                 int vc_num = 0;
1026                 /*
1027                  * NOTE! It seems the virtual channels from the mipi csi-2
1028                  * receiver are used only for routing by the video mux's,
1029                  * or for hard-wired routing to the CSI's. Once the stream
1030                  * enters the CSI's however, they are treated internally
1031                  * in the IPU as virtual channel 0.
1032                  */
1033 #if 0
1034                 mutex_unlock(&priv->lock);
1035                 vc_num = imx_media_find_mipi_csi2_channel(priv->md,
1036                                                           &priv->sd.entity);
1037                 if (vc_num < 0)
1038                         return vc_num;
1039                 mutex_lock(&priv->lock);
1040 #endif
1041                 ipu_csi_set_mipi_datatype(priv->csi, vc_num,
1042                                           &priv->format_mbus[CSI_SINK_PAD]);
1043         }
1044
1045         /* select either parallel or MIPI-CSI2 as input to CSI */
1046         ipu_set_csi_src_mux(priv->ipu, priv->csi_id, is_csi2);
1047 out:
1048         mutex_unlock(&priv->lock);
1049         return ret;
1050 }
1051
1052 static struct v4l2_mbus_framefmt *
1053 __csi_get_fmt(struct csi_priv *priv, struct v4l2_subdev_pad_config *cfg,
1054               unsigned int pad, enum v4l2_subdev_format_whence which)
1055 {
1056         if (which == V4L2_SUBDEV_FORMAT_TRY)
1057                 return v4l2_subdev_get_try_format(&priv->sd, cfg, pad);
1058         else
1059                 return &priv->format_mbus[pad];
1060 }
1061
1062 static struct v4l2_rect *
1063 __csi_get_crop(struct csi_priv *priv, struct v4l2_subdev_pad_config *cfg,
1064                enum v4l2_subdev_format_whence which)
1065 {
1066         if (which == V4L2_SUBDEV_FORMAT_TRY)
1067                 return v4l2_subdev_get_try_crop(&priv->sd, cfg, CSI_SINK_PAD);
1068         else
1069                 return &priv->crop;
1070 }
1071
1072 static struct v4l2_rect *
1073 __csi_get_compose(struct csi_priv *priv, struct v4l2_subdev_pad_config *cfg,
1074                   enum v4l2_subdev_format_whence which)
1075 {
1076         if (which == V4L2_SUBDEV_FORMAT_TRY)
1077                 return v4l2_subdev_get_try_compose(&priv->sd, cfg,
1078                                                    CSI_SINK_PAD);
1079         else
1080                 return &priv->compose;
1081 }
1082
1083 static void csi_try_crop(struct csi_priv *priv,
1084                          struct v4l2_rect *crop,
1085                          struct v4l2_subdev_pad_config *cfg,
1086                          struct v4l2_mbus_framefmt *infmt,
1087                          struct imx_media_subdev *sensor)
1088 {
1089         struct v4l2_fwnode_endpoint *sensor_ep;
1090
1091         sensor_ep = &sensor->sensor_ep;
1092
1093         crop->width = min_t(__u32, infmt->width, crop->width);
1094         if (crop->left + crop->width > infmt->width)
1095                 crop->left = infmt->width - crop->width;
1096         /* adjust crop left/width to h/w alignment restrictions */
1097         crop->left &= ~0x3;
1098         crop->width &= ~0x7;
1099
1100         /*
1101          * FIXME: not sure why yet, but on interlaced bt.656,
1102          * changing the vertical cropping causes loss of vertical
1103          * sync, so fix it to NTSC/PAL active lines. NTSC contains
1104          * 2 extra lines of active video that need to be cropped.
1105          */
1106         if (sensor_ep->bus_type == V4L2_MBUS_BT656 &&
1107             (V4L2_FIELD_HAS_BOTH(infmt->field) ||
1108              infmt->field == V4L2_FIELD_ALTERNATE)) {
1109                 crop->height = infmt->height;
1110                 crop->top = (infmt->height == 480) ? 2 : 0;
1111         } else {
1112                 crop->height = min_t(__u32, infmt->height, crop->height);
1113                 if (crop->top + crop->height > infmt->height)
1114                         crop->top = infmt->height - crop->height;
1115         }
1116 }
1117
1118 static int csi_enum_mbus_code(struct v4l2_subdev *sd,
1119                               struct v4l2_subdev_pad_config *cfg,
1120                               struct v4l2_subdev_mbus_code_enum *code)
1121 {
1122         struct csi_priv *priv = v4l2_get_subdevdata(sd);
1123         const struct imx_media_pixfmt *incc;
1124         struct v4l2_mbus_framefmt *infmt;
1125         int ret = 0;
1126
1127         mutex_lock(&priv->lock);
1128
1129         infmt = __csi_get_fmt(priv, cfg, CSI_SINK_PAD, code->which);
1130         incc = imx_media_find_mbus_format(infmt->code, CS_SEL_ANY, true);
1131
1132         switch (code->pad) {
1133         case CSI_SINK_PAD:
1134                 ret = imx_media_enum_mbus_format(&code->code, code->index,
1135                                                  CS_SEL_ANY, true);
1136                 break;
1137         case CSI_SRC_PAD_DIRECT:
1138         case CSI_SRC_PAD_IDMAC:
1139                 if (incc->bayer) {
1140                         if (code->index != 0) {
1141                                 ret = -EINVAL;
1142                                 goto out;
1143                         }
1144                         code->code = infmt->code;
1145                 } else {
1146                         u32 cs_sel = (incc->cs == IPUV3_COLORSPACE_YUV) ?
1147                                 CS_SEL_YUV : CS_SEL_RGB;
1148                         ret = imx_media_enum_ipu_format(&code->code,
1149                                                         code->index,
1150                                                         cs_sel);
1151                 }
1152                 break;
1153         default:
1154                 ret = -EINVAL;
1155         }
1156
1157 out:
1158         mutex_unlock(&priv->lock);
1159         return ret;
1160 }
1161
1162 static int csi_enum_frame_size(struct v4l2_subdev *sd,
1163                                struct v4l2_subdev_pad_config *cfg,
1164                                struct v4l2_subdev_frame_size_enum *fse)
1165 {
1166         struct csi_priv *priv = v4l2_get_subdevdata(sd);
1167         struct v4l2_rect *crop;
1168         int ret = 0;
1169
1170         if (fse->pad >= CSI_NUM_PADS ||
1171             fse->index > (fse->pad == CSI_SINK_PAD ? 0 : 3))
1172                 return -EINVAL;
1173
1174         mutex_lock(&priv->lock);
1175
1176         if (fse->pad == CSI_SINK_PAD) {
1177                 fse->min_width = MIN_W;
1178                 fse->max_width = MAX_W;
1179                 fse->min_height = MIN_H;
1180                 fse->max_height = MAX_H;
1181         } else {
1182                 crop = __csi_get_crop(priv, cfg, fse->which);
1183
1184                 fse->min_width = fse->max_width = fse->index & 1 ?
1185                         crop->width / 2 : crop->width;
1186                 fse->min_height = fse->max_height = fse->index & 2 ?
1187                         crop->height / 2 : crop->height;
1188         }
1189
1190         mutex_unlock(&priv->lock);
1191         return ret;
1192 }
1193
1194 static int csi_enum_frame_interval(struct v4l2_subdev *sd,
1195                                    struct v4l2_subdev_pad_config *cfg,
1196                                    struct v4l2_subdev_frame_interval_enum *fie)
1197 {
1198         struct csi_priv *priv = v4l2_get_subdevdata(sd);
1199         struct v4l2_fract *input_fi;
1200         struct v4l2_rect *crop;
1201         int ret = 0;
1202
1203         if (fie->pad >= CSI_NUM_PADS ||
1204             fie->index >= (fie->pad != CSI_SRC_PAD_IDMAC ?
1205                            1 : ARRAY_SIZE(csi_skip)))
1206                 return -EINVAL;
1207
1208         mutex_lock(&priv->lock);
1209
1210         input_fi = &priv->frame_interval[CSI_SINK_PAD];
1211         crop = __csi_get_crop(priv, cfg, fie->which);
1212
1213         if ((fie->width != crop->width && fie->width != crop->width / 2) ||
1214             (fie->height != crop->height && fie->height != crop->height / 2)) {
1215                 ret = -EINVAL;
1216                 goto out;
1217         }
1218
1219         fie->interval = *input_fi;
1220
1221         if (fie->pad == CSI_SRC_PAD_IDMAC)
1222                 csi_apply_skip_interval(&csi_skip[fie->index],
1223                                         &fie->interval);
1224
1225 out:
1226         mutex_unlock(&priv->lock);
1227         return ret;
1228 }
1229
1230 static int csi_get_fmt(struct v4l2_subdev *sd,
1231                        struct v4l2_subdev_pad_config *cfg,
1232                        struct v4l2_subdev_format *sdformat)
1233 {
1234         struct csi_priv *priv = v4l2_get_subdevdata(sd);
1235         struct v4l2_mbus_framefmt *fmt;
1236         int ret = 0;
1237
1238         if (sdformat->pad >= CSI_NUM_PADS)
1239                 return -EINVAL;
1240
1241         mutex_lock(&priv->lock);
1242
1243         fmt = __csi_get_fmt(priv, cfg, sdformat->pad, sdformat->which);
1244         if (!fmt) {
1245                 ret = -EINVAL;
1246                 goto out;
1247         }
1248
1249         sdformat->format = *fmt;
1250 out:
1251         mutex_unlock(&priv->lock);
1252         return ret;
1253 }
1254
1255 static void csi_try_fmt(struct csi_priv *priv,
1256                         struct imx_media_subdev *sensor,
1257                         struct v4l2_subdev_pad_config *cfg,
1258                         struct v4l2_subdev_format *sdformat,
1259                         struct v4l2_rect *crop,
1260                         struct v4l2_rect *compose,
1261                         const struct imx_media_pixfmt **cc)
1262 {
1263         const struct imx_media_pixfmt *incc;
1264         struct v4l2_mbus_framefmt *infmt;
1265         u32 code;
1266
1267         infmt = __csi_get_fmt(priv, cfg, CSI_SINK_PAD, sdformat->which);
1268
1269         switch (sdformat->pad) {
1270         case CSI_SRC_PAD_DIRECT:
1271         case CSI_SRC_PAD_IDMAC:
1272                 incc = imx_media_find_mbus_format(infmt->code,
1273                                                   CS_SEL_ANY, true);
1274
1275                 sdformat->format.width = compose->width;
1276                 sdformat->format.height = compose->height;
1277
1278                 if (incc->bayer) {
1279                         sdformat->format.code = infmt->code;
1280                         *cc = incc;
1281                 } else {
1282                         u32 cs_sel = (incc->cs == IPUV3_COLORSPACE_YUV) ?
1283                                 CS_SEL_YUV : CS_SEL_RGB;
1284
1285                         *cc = imx_media_find_ipu_format(sdformat->format.code,
1286                                                         cs_sel);
1287                         if (!*cc) {
1288                                 imx_media_enum_ipu_format(&code, 0, cs_sel);
1289                                 *cc = imx_media_find_ipu_format(code, cs_sel);
1290                                 sdformat->format.code = (*cc)->codes[0];
1291                         }
1292                 }
1293
1294                 if (sdformat->pad == CSI_SRC_PAD_DIRECT ||
1295                     sdformat->format.field != V4L2_FIELD_NONE)
1296                         sdformat->format.field = infmt->field;
1297
1298                 /*
1299                  * translate V4L2_FIELD_ALTERNATE to SEQ_TB or SEQ_BT
1300                  * depending on input height (assume NTSC top-bottom
1301                  * order if 480 lines, otherwise PAL bottom-top order).
1302                  */
1303                 if (sdformat->format.field == V4L2_FIELD_ALTERNATE) {
1304                         sdformat->format.field =  (infmt->height == 480) ?
1305                                 V4L2_FIELD_SEQ_TB : V4L2_FIELD_SEQ_BT;
1306                 }
1307
1308                 /* propagate colorimetry from sink */
1309                 sdformat->format.colorspace = infmt->colorspace;
1310                 sdformat->format.xfer_func = infmt->xfer_func;
1311                 sdformat->format.quantization = infmt->quantization;
1312                 sdformat->format.ycbcr_enc = infmt->ycbcr_enc;
1313                 break;
1314         case CSI_SINK_PAD:
1315                 v4l_bound_align_image(&sdformat->format.width, MIN_W, MAX_W,
1316                                       W_ALIGN, &sdformat->format.height,
1317                                       MIN_H, MAX_H, H_ALIGN, S_ALIGN);
1318
1319                 /* Reset crop and compose rectangles */
1320                 crop->left = 0;
1321                 crop->top = 0;
1322                 crop->width = sdformat->format.width;
1323                 crop->height = sdformat->format.height;
1324                 csi_try_crop(priv, crop, cfg, &sdformat->format, sensor);
1325                 compose->left = 0;
1326                 compose->top = 0;
1327                 compose->width = crop->width;
1328                 compose->height = crop->height;
1329
1330                 *cc = imx_media_find_mbus_format(sdformat->format.code,
1331                                                  CS_SEL_ANY, true);
1332                 if (!*cc) {
1333                         imx_media_enum_mbus_format(&code, 0,
1334                                                    CS_SEL_ANY, false);
1335                         *cc = imx_media_find_mbus_format(code,
1336                                                         CS_SEL_ANY, false);
1337                         sdformat->format.code = (*cc)->codes[0];
1338                 }
1339
1340                 imx_media_fill_default_mbus_fields(
1341                         &sdformat->format, infmt,
1342                         priv->active_output_pad == CSI_SRC_PAD_DIRECT);
1343                 break;
1344         }
1345 }
1346
1347 static int csi_set_fmt(struct v4l2_subdev *sd,
1348                        struct v4l2_subdev_pad_config *cfg,
1349                        struct v4l2_subdev_format *sdformat)
1350 {
1351         struct csi_priv *priv = v4l2_get_subdevdata(sd);
1352         struct imx_media_video_dev *vdev = priv->vdev;
1353         const struct imx_media_pixfmt *cc;
1354         struct imx_media_subdev *sensor;
1355         struct v4l2_pix_format vdev_fmt;
1356         struct v4l2_mbus_framefmt *fmt;
1357         struct v4l2_rect *crop, *compose;
1358         int ret = 0;
1359
1360         if (sdformat->pad >= CSI_NUM_PADS)
1361                 return -EINVAL;
1362
1363         sensor = imx_media_find_sensor(priv->md, &priv->sd.entity);
1364         if (IS_ERR(sensor)) {
1365                 v4l2_err(&priv->sd, "no sensor attached\n");
1366                 return PTR_ERR(sensor);
1367         }
1368
1369         mutex_lock(&priv->lock);
1370
1371         if (priv->stream_count > 0) {
1372                 ret = -EBUSY;
1373                 goto out;
1374         }
1375
1376         crop = __csi_get_crop(priv, cfg, sdformat->which);
1377         compose = __csi_get_compose(priv, cfg, sdformat->which);
1378
1379         csi_try_fmt(priv, sensor, cfg, sdformat, crop, compose, &cc);
1380
1381         fmt = __csi_get_fmt(priv, cfg, sdformat->pad, sdformat->which);
1382         *fmt = sdformat->format;
1383
1384         if (sdformat->pad == CSI_SINK_PAD) {
1385                 int pad;
1386
1387                 /* propagate format to source pads */
1388                 for (pad = CSI_SINK_PAD + 1; pad < CSI_NUM_PADS; pad++) {
1389                         const struct imx_media_pixfmt *outcc;
1390                         struct v4l2_mbus_framefmt *outfmt;
1391                         struct v4l2_subdev_format format;
1392
1393                         format.pad = pad;
1394                         format.which = sdformat->which;
1395                         format.format = sdformat->format;
1396                         csi_try_fmt(priv, sensor, cfg, &format, NULL, compose,
1397                                     &outcc);
1398
1399                         outfmt = __csi_get_fmt(priv, cfg, pad, sdformat->which);
1400                         *outfmt = format.format;
1401
1402                         if (sdformat->which == V4L2_SUBDEV_FORMAT_ACTIVE)
1403                                 priv->cc[pad] = outcc;
1404                 }
1405         }
1406
1407         if (sdformat->which == V4L2_SUBDEV_FORMAT_TRY)
1408                 goto out;
1409
1410         priv->cc[sdformat->pad] = cc;
1411
1412         /* propagate IDMAC output pad format to capture device */
1413         imx_media_mbus_fmt_to_pix_fmt(&vdev_fmt,
1414                                       &priv->format_mbus[CSI_SRC_PAD_IDMAC],
1415                                       priv->cc[CSI_SRC_PAD_IDMAC]);
1416         mutex_unlock(&priv->lock);
1417         imx_media_capture_device_set_format(vdev, &vdev_fmt);
1418
1419         return 0;
1420 out:
1421         mutex_unlock(&priv->lock);
1422         return ret;
1423 }
1424
1425 static int csi_get_selection(struct v4l2_subdev *sd,
1426                              struct v4l2_subdev_pad_config *cfg,
1427                              struct v4l2_subdev_selection *sel)
1428 {
1429         struct csi_priv *priv = v4l2_get_subdevdata(sd);
1430         struct v4l2_mbus_framefmt *infmt;
1431         struct v4l2_rect *crop, *compose;
1432         int ret = 0;
1433
1434         if (sel->pad != CSI_SINK_PAD)
1435                 return -EINVAL;
1436
1437         mutex_lock(&priv->lock);
1438
1439         infmt = __csi_get_fmt(priv, cfg, CSI_SINK_PAD, sel->which);
1440         crop = __csi_get_crop(priv, cfg, sel->which);
1441         compose = __csi_get_compose(priv, cfg, sel->which);
1442
1443         switch (sel->target) {
1444         case V4L2_SEL_TGT_CROP_BOUNDS:
1445                 sel->r.left = 0;
1446                 sel->r.top = 0;
1447                 sel->r.width = infmt->width;
1448                 sel->r.height = infmt->height;
1449                 break;
1450         case V4L2_SEL_TGT_CROP:
1451                 sel->r = *crop;
1452                 break;
1453         case V4L2_SEL_TGT_COMPOSE_BOUNDS:
1454                 sel->r.left = 0;
1455                 sel->r.top = 0;
1456                 sel->r.width = crop->width;
1457                 sel->r.height = crop->height;
1458                 break;
1459         case V4L2_SEL_TGT_COMPOSE:
1460                 sel->r = *compose;
1461                 break;
1462         default:
1463                 ret = -EINVAL;
1464         }
1465
1466         mutex_unlock(&priv->lock);
1467         return ret;
1468 }
1469
1470 static int csi_set_scale(u32 *compose, u32 crop, u32 flags)
1471 {
1472         if ((flags & (V4L2_SEL_FLAG_LE | V4L2_SEL_FLAG_GE)) ==
1473                      (V4L2_SEL_FLAG_LE | V4L2_SEL_FLAG_GE) &&
1474             *compose != crop && *compose != crop / 2)
1475                 return -ERANGE;
1476
1477         if (*compose <= crop / 2 ||
1478             (*compose < crop * 3 / 4 && !(flags & V4L2_SEL_FLAG_GE)) ||
1479             (*compose < crop && (flags & V4L2_SEL_FLAG_LE)))
1480                 *compose = crop / 2;
1481         else
1482                 *compose = crop;
1483
1484         return 0;
1485 }
1486
1487 static int csi_set_selection(struct v4l2_subdev *sd,
1488                              struct v4l2_subdev_pad_config *cfg,
1489                              struct v4l2_subdev_selection *sel)
1490 {
1491         struct csi_priv *priv = v4l2_get_subdevdata(sd);
1492         struct v4l2_mbus_framefmt *infmt;
1493         struct v4l2_rect *crop, *compose;
1494         struct imx_media_subdev *sensor;
1495         int pad, ret = 0;
1496
1497         if (sel->pad != CSI_SINK_PAD)
1498                 return -EINVAL;
1499
1500         sensor = imx_media_find_sensor(priv->md, &priv->sd.entity);
1501         if (IS_ERR(sensor)) {
1502                 v4l2_err(&priv->sd, "no sensor attached\n");
1503                 return PTR_ERR(sensor);
1504         }
1505
1506         mutex_lock(&priv->lock);
1507
1508         if (priv->stream_count > 0) {
1509                 ret = -EBUSY;
1510                 goto out;
1511         }
1512
1513         infmt = __csi_get_fmt(priv, cfg, CSI_SINK_PAD, sel->which);
1514         crop = __csi_get_crop(priv, cfg, sel->which);
1515         compose = __csi_get_compose(priv, cfg, sel->which);
1516
1517         switch (sel->target) {
1518         case V4L2_SEL_TGT_CROP:
1519                 /*
1520                  * Modifying the crop rectangle always changes the format on
1521                  * the source pads. If the KEEP_CONFIG flag is set, just return
1522                  * the current crop rectangle.
1523                  */
1524                 if (sel->flags & V4L2_SEL_FLAG_KEEP_CONFIG) {
1525                         sel->r = priv->crop;
1526                         if (sel->which == V4L2_SUBDEV_FORMAT_TRY)
1527                                 *crop = sel->r;
1528                         goto out;
1529                 }
1530
1531                 csi_try_crop(priv, &sel->r, cfg, infmt, sensor);
1532
1533                 *crop = sel->r;
1534
1535                 /* Reset scaling to 1:1 */
1536                 compose->width = crop->width;
1537                 compose->height = crop->height;
1538                 break;
1539         case V4L2_SEL_TGT_COMPOSE:
1540                 /*
1541                  * Modifying the compose rectangle always changes the format on
1542                  * the source pads. If the KEEP_CONFIG flag is set, just return
1543                  * the current compose rectangle.
1544                  */
1545                 if (sel->flags & V4L2_SEL_FLAG_KEEP_CONFIG) {
1546                         sel->r = priv->compose;
1547                         if (sel->which == V4L2_SUBDEV_FORMAT_TRY)
1548                                 *compose = sel->r;
1549                         goto out;
1550                 }
1551
1552                 sel->r.left = 0;
1553                 sel->r.top = 0;
1554                 ret = csi_set_scale(&sel->r.width, crop->width, sel->flags);
1555                 if (ret)
1556                         goto out;
1557                 ret = csi_set_scale(&sel->r.height, crop->height, sel->flags);
1558                 if (ret)
1559                         goto out;
1560
1561                 *compose = sel->r;
1562                 break;
1563         default:
1564                 ret = -EINVAL;
1565                 goto out;
1566         }
1567
1568         /* Reset source pads to sink compose rectangle */
1569         for (pad = CSI_SINK_PAD + 1; pad < CSI_NUM_PADS; pad++) {
1570                 struct v4l2_mbus_framefmt *outfmt;
1571
1572                 outfmt = __csi_get_fmt(priv, cfg, pad, sel->which);
1573                 outfmt->width = compose->width;
1574                 outfmt->height = compose->height;
1575         }
1576
1577 out:
1578         mutex_unlock(&priv->lock);
1579         return ret;
1580 }
1581
1582 static int csi_subscribe_event(struct v4l2_subdev *sd, struct v4l2_fh *fh,
1583                                struct v4l2_event_subscription *sub)
1584 {
1585         if (sub->type != V4L2_EVENT_IMX_FRAME_INTERVAL_ERROR)
1586                 return -EINVAL;
1587         if (sub->id != 0)
1588                 return -EINVAL;
1589
1590         return v4l2_event_subscribe(fh, sub, 0, NULL);
1591 }
1592
1593 static int csi_unsubscribe_event(struct v4l2_subdev *sd, struct v4l2_fh *fh,
1594                                  struct v4l2_event_subscription *sub)
1595 {
1596         return v4l2_event_unsubscribe(fh, sub);
1597 }
1598
1599 /*
1600  * retrieve our pads parsed from the OF graph by the media device
1601  */
1602 static int csi_registered(struct v4l2_subdev *sd)
1603 {
1604         struct csi_priv *priv = v4l2_get_subdevdata(sd);
1605         struct ipu_csi *csi;
1606         int i, ret;
1607         u32 code;
1608
1609         /* get media device */
1610         priv->md = dev_get_drvdata(sd->v4l2_dev->dev);
1611
1612         /* get handle to IPU CSI */
1613         csi = ipu_csi_get(priv->ipu, priv->csi_id);
1614         if (IS_ERR(csi)) {
1615                 v4l2_err(&priv->sd, "failed to get CSI%d\n", priv->csi_id);
1616                 return PTR_ERR(csi);
1617         }
1618         priv->csi = csi;
1619
1620         for (i = 0; i < CSI_NUM_PADS; i++) {
1621                 priv->pad[i].flags = (i == CSI_SINK_PAD) ?
1622                         MEDIA_PAD_FL_SINK : MEDIA_PAD_FL_SOURCE;
1623
1624                 code = 0;
1625                 if (i != CSI_SINK_PAD)
1626                         imx_media_enum_ipu_format(&code, 0, CS_SEL_YUV);
1627
1628                 /* set a default mbus format  */
1629                 ret = imx_media_init_mbus_fmt(&priv->format_mbus[i],
1630                                               640, 480, code, V4L2_FIELD_NONE,
1631                                               &priv->cc[i]);
1632                 if (ret)
1633                         goto put_csi;
1634
1635                 /* init default frame interval */
1636                 priv->frame_interval[i].numerator = 1;
1637                 priv->frame_interval[i].denominator = 30;
1638         }
1639
1640         /* disable frame skipping */
1641         priv->skip = &csi_skip[0];
1642
1643         /* init default crop and compose rectangle sizes */
1644         priv->crop.width = 640;
1645         priv->crop.height = 480;
1646         priv->compose.width = 640;
1647         priv->compose.height = 480;
1648
1649         priv->fim = imx_media_fim_init(&priv->sd);
1650         if (IS_ERR(priv->fim)) {
1651                 ret = PTR_ERR(priv->fim);
1652                 goto put_csi;
1653         }
1654
1655         ret = media_entity_pads_init(&sd->entity, CSI_NUM_PADS, priv->pad);
1656         if (ret)
1657                 goto free_fim;
1658
1659         ret = imx_media_capture_device_register(priv->vdev);
1660         if (ret)
1661                 goto free_fim;
1662
1663         ret = imx_media_add_video_device(priv->md, priv->vdev);
1664         if (ret)
1665                 goto unreg;
1666
1667         return 0;
1668 unreg:
1669         imx_media_capture_device_unregister(priv->vdev);
1670 free_fim:
1671         if (priv->fim)
1672                 imx_media_fim_free(priv->fim);
1673 put_csi:
1674         ipu_csi_put(priv->csi);
1675         return ret;
1676 }
1677
1678 static void csi_unregistered(struct v4l2_subdev *sd)
1679 {
1680         struct csi_priv *priv = v4l2_get_subdevdata(sd);
1681
1682         imx_media_capture_device_unregister(priv->vdev);
1683
1684         if (priv->fim)
1685                 imx_media_fim_free(priv->fim);
1686
1687         if (priv->csi)
1688                 ipu_csi_put(priv->csi);
1689 }
1690
1691 static const struct media_entity_operations csi_entity_ops = {
1692         .link_setup = csi_link_setup,
1693         .link_validate = v4l2_subdev_link_validate,
1694 };
1695
1696 static const struct v4l2_subdev_core_ops csi_core_ops = {
1697         .subscribe_event = csi_subscribe_event,
1698         .unsubscribe_event = csi_unsubscribe_event,
1699 };
1700
1701 static const struct v4l2_subdev_video_ops csi_video_ops = {
1702         .g_frame_interval = csi_g_frame_interval,
1703         .s_frame_interval = csi_s_frame_interval,
1704         .s_stream = csi_s_stream,
1705 };
1706
1707 static const struct v4l2_subdev_pad_ops csi_pad_ops = {
1708         .enum_mbus_code = csi_enum_mbus_code,
1709         .enum_frame_size = csi_enum_frame_size,
1710         .enum_frame_interval = csi_enum_frame_interval,
1711         .get_fmt = csi_get_fmt,
1712         .set_fmt = csi_set_fmt,
1713         .get_selection = csi_get_selection,
1714         .set_selection = csi_set_selection,
1715         .link_validate = csi_link_validate,
1716 };
1717
1718 static const struct v4l2_subdev_ops csi_subdev_ops = {
1719         .core = &csi_core_ops,
1720         .video = &csi_video_ops,
1721         .pad = &csi_pad_ops,
1722 };
1723
1724 static const struct v4l2_subdev_internal_ops csi_internal_ops = {
1725         .registered = csi_registered,
1726         .unregistered = csi_unregistered,
1727 };
1728
1729 static int imx_csi_probe(struct platform_device *pdev)
1730 {
1731         struct ipu_client_platformdata *pdata;
1732         struct pinctrl *pinctrl;
1733         struct csi_priv *priv;
1734         int ret;
1735
1736         priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL);
1737         if (!priv)
1738                 return -ENOMEM;
1739
1740         platform_set_drvdata(pdev, &priv->sd);
1741         priv->dev = &pdev->dev;
1742
1743         ret = dma_set_coherent_mask(priv->dev, DMA_BIT_MASK(32));
1744         if (ret)
1745                 return ret;
1746
1747         /* get parent IPU */
1748         priv->ipu = dev_get_drvdata(priv->dev->parent);
1749
1750         /* get our CSI id */
1751         pdata = priv->dev->platform_data;
1752         priv->csi_id = pdata->csi;
1753         priv->smfc_id = (priv->csi_id == 0) ? 0 : 2;
1754
1755         setup_timer(&priv->eof_timeout_timer, csi_idmac_eof_timeout,
1756                     (unsigned long)priv);
1757         spin_lock_init(&priv->irqlock);
1758
1759         v4l2_subdev_init(&priv->sd, &csi_subdev_ops);
1760         v4l2_set_subdevdata(&priv->sd, priv);
1761         priv->sd.internal_ops = &csi_internal_ops;
1762         priv->sd.entity.ops = &csi_entity_ops;
1763         priv->sd.entity.function = MEDIA_ENT_F_PROC_VIDEO_PIXEL_FORMATTER;
1764         priv->sd.dev = &pdev->dev;
1765         priv->sd.fwnode = of_fwnode_handle(pdata->of_node);
1766         priv->sd.owner = THIS_MODULE;
1767         priv->sd.flags = V4L2_SUBDEV_FL_HAS_DEVNODE | V4L2_SUBDEV_FL_HAS_EVENTS;
1768         priv->sd.grp_id = priv->csi_id ?
1769                 IMX_MEDIA_GRP_ID_CSI1 : IMX_MEDIA_GRP_ID_CSI0;
1770         imx_media_grp_id_to_sd_name(priv->sd.name, sizeof(priv->sd.name),
1771                                     priv->sd.grp_id, ipu_get_num(priv->ipu));
1772
1773         priv->vdev = imx_media_capture_device_init(&priv->sd,
1774                                                    CSI_SRC_PAD_IDMAC);
1775         if (IS_ERR(priv->vdev))
1776                 return PTR_ERR(priv->vdev);
1777
1778         mutex_init(&priv->lock);
1779
1780         v4l2_ctrl_handler_init(&priv->ctrl_hdlr, 0);
1781         priv->sd.ctrl_handler = &priv->ctrl_hdlr;
1782
1783         /*
1784          * The IPUv3 driver did not assign an of_node to this
1785          * device. As a result, pinctrl does not automatically
1786          * configure our pin groups, so we need to do that manually
1787          * here, after setting this device's of_node.
1788          */
1789         priv->dev->of_node = pdata->of_node;
1790         pinctrl = devm_pinctrl_get_select_default(priv->dev);
1791
1792         ret = v4l2_async_register_subdev(&priv->sd);
1793         if (ret)
1794                 goto free;
1795
1796         return 0;
1797 free:
1798         v4l2_ctrl_handler_free(&priv->ctrl_hdlr);
1799         mutex_destroy(&priv->lock);
1800         imx_media_capture_device_remove(priv->vdev);
1801         return ret;
1802 }
1803
1804 static int imx_csi_remove(struct platform_device *pdev)
1805 {
1806         struct v4l2_subdev *sd = platform_get_drvdata(pdev);
1807         struct csi_priv *priv = sd_to_dev(sd);
1808
1809         v4l2_ctrl_handler_free(&priv->ctrl_hdlr);
1810         mutex_destroy(&priv->lock);
1811         imx_media_capture_device_remove(priv->vdev);
1812         v4l2_async_unregister_subdev(sd);
1813         media_entity_cleanup(&sd->entity);
1814
1815         return 0;
1816 }
1817
1818 static const struct platform_device_id imx_csi_ids[] = {
1819         { .name = "imx-ipuv3-csi" },
1820         { },
1821 };
1822 MODULE_DEVICE_TABLE(platform, imx_csi_ids);
1823
1824 static struct platform_driver imx_csi_driver = {
1825         .probe = imx_csi_probe,
1826         .remove = imx_csi_remove,
1827         .id_table = imx_csi_ids,
1828         .driver = {
1829                 .name = "imx-ipuv3-csi",
1830         },
1831 };
1832 module_platform_driver(imx_csi_driver);
1833
1834 MODULE_DESCRIPTION("i.MX CSI subdev driver");
1835 MODULE_AUTHOR("Steve Longerbeam <steve_longerbeam@mentor.com>");
1836 MODULE_LICENSE("GPL");
1837 MODULE_ALIAS("platform:imx-ipuv3-csi");