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0001 // SPDX-License-Identifier: GPL-2.0+
0002 /*
0003  * V4L2 Capture CSI Subdev for Freescale i.MX5/6 SOC
0004  *
0005  * Copyright (c) 2014-2017 Mentor Graphics Inc.
0006  * Copyright (C) 2017 Pengutronix, Philipp Zabel <kernel@pengutronix.de>
0007  */
0008 #include <linux/delay.h>
0009 #include <linux/gcd.h>
0010 #include <linux/interrupt.h>
0011 #include <linux/module.h>
0012 #include <linux/of_graph.h>
0013 #include <linux/pinctrl/consumer.h>
0014 #include <linux/platform_device.h>
0015 #include <media/v4l2-ctrls.h>
0016 #include <media/v4l2-device.h>
0017 #include <media/v4l2-event.h>
0018 #include <media/v4l2-fwnode.h>
0019 #include <media/v4l2-mc.h>
0020 #include <media/v4l2-subdev.h>
0021 #include <media/videobuf2-dma-contig.h>
0022 #include <video/imx-ipu-v3.h>
0023 #include <media/imx.h>
0024 #include "imx-media.h"
0025 
0026 /*
0027  * Min/Max supported width and heights.
0028  *
0029  * We allow planar output, so we have to align width by 16 pixels
0030  * to meet IDMAC alignment requirements.
0031  *
0032  * TODO: move this into pad format negotiation, if capture device
0033  * has not requested planar formats, we should allow 8 pixel
0034  * alignment.
0035  */
0036 #define MIN_W       32
0037 #define MIN_H       32
0038 #define MAX_W      4096
0039 #define MAX_H      4096
0040 #define W_ALIGN    1 /* multiple of 2 pixels */
0041 #define H_ALIGN    1 /* multiple of 2 lines */
0042 #define S_ALIGN    1 /* multiple of 2 */
0043 
0044 /*
0045  * struct csi_skip_desc - CSI frame skipping descriptor
0046  * @keep - number of frames kept per max_ratio frames
0047  * @max_ratio - width of skip_smfc, written to MAX_RATIO bitfield
0048  * @skip_smfc - skip pattern written to the SKIP_SMFC bitfield
0049  */
0050 struct csi_skip_desc {
0051     u8 keep;
0052     u8 max_ratio;
0053     u8 skip_smfc;
0054 };
0055 
0056 struct csi_priv {
0057     struct device *dev;
0058     struct ipu_soc *ipu;
0059     struct v4l2_subdev sd;
0060     struct media_pad pad[CSI_NUM_PADS];
0061     struct v4l2_async_notifier notifier;
0062 
0063     /* the video device at IDMAC output pad */
0064     struct imx_media_video_dev *vdev;
0065     struct imx_media_fim *fim;
0066     int csi_id;
0067     int smfc_id;
0068 
0069     /* lock to protect all members below */
0070     struct mutex lock;
0071 
0072     int active_output_pad;
0073 
0074     struct ipuv3_channel *idmac_ch;
0075     struct ipu_smfc *smfc;
0076     struct ipu_csi *csi;
0077 
0078     struct v4l2_mbus_framefmt format_mbus[CSI_NUM_PADS];
0079     const struct imx_media_pixfmt *cc[CSI_NUM_PADS];
0080     struct v4l2_fract frame_interval[CSI_NUM_PADS];
0081     struct v4l2_rect crop;
0082     struct v4l2_rect compose;
0083     const struct csi_skip_desc *skip;
0084 
0085     /* active vb2 buffers to send to video dev sink */
0086     struct imx_media_buffer *active_vb2_buf[2];
0087     struct imx_media_dma_buf underrun_buf;
0088 
0089     int ipu_buf_num;  /* ipu double buffer index: 0-1 */
0090 
0091     /* the sink for the captured frames */
0092     struct media_entity *sink;
0093     enum ipu_csi_dest dest;
0094     /* the source subdev */
0095     struct v4l2_subdev *src_sd;
0096 
0097     /* the mipi virtual channel number at link validate */
0098     int vc_num;
0099 
0100     /* the upstream endpoint CSI is receiving from */
0101     struct v4l2_fwnode_endpoint upstream_ep;
0102 
0103     spinlock_t irqlock; /* protect eof_irq handler */
0104     struct timer_list eof_timeout_timer;
0105     int eof_irq;
0106     int nfb4eof_irq;
0107 
0108     struct v4l2_ctrl_handler ctrl_hdlr;
0109 
0110     int stream_count; /* streaming counter */
0111     u32 frame_sequence; /* frame sequence counter */
0112     bool last_eof;   /* waiting for last EOF at stream off */
0113     bool nfb4eof;    /* NFB4EOF encountered during streaming */
0114     bool interweave_swap; /* swap top/bottom lines when interweaving */
0115     struct completion last_eof_comp;
0116 };
0117 
0118 static inline struct csi_priv *sd_to_dev(struct v4l2_subdev *sdev)
0119 {
0120     return container_of(sdev, struct csi_priv, sd);
0121 }
0122 
0123 static inline struct csi_priv *notifier_to_dev(struct v4l2_async_notifier *n)
0124 {
0125     return container_of(n, struct csi_priv, notifier);
0126 }
0127 
0128 static inline bool is_parallel_bus(struct v4l2_fwnode_endpoint *ep)
0129 {
0130     return ep->bus_type != V4L2_MBUS_CSI2_DPHY;
0131 }
0132 
0133 static inline bool is_parallel_16bit_bus(struct v4l2_fwnode_endpoint *ep)
0134 {
0135     return is_parallel_bus(ep) && ep->bus.parallel.bus_width >= 16;
0136 }
0137 
0138 /*
0139  * Check for conditions that require the IPU to handle the
0140  * data internally as generic data, aka passthrough mode:
0141  * - raw bayer media bus formats, or
0142  * - BT.656 and BT.1120 (8/10-bit YUV422) data can always be processed
0143  *   on-the-fly
0144  * - the CSI is receiving from a 16-bit parallel bus, or
0145  * - the CSI is receiving from an 8-bit parallel bus and the incoming
0146  *   media bus format is other than UYVY8_2X8/YUYV8_2X8.
0147  */
0148 static inline bool requires_passthrough(struct v4l2_fwnode_endpoint *ep,
0149                     struct v4l2_mbus_framefmt *infmt,
0150                     const struct imx_media_pixfmt *incc)
0151 {
0152     if (ep->bus_type == V4L2_MBUS_BT656) // including BT.1120
0153         return false;
0154 
0155     return incc->bayer || is_parallel_16bit_bus(ep) ||
0156         (is_parallel_bus(ep) &&
0157          infmt->code != MEDIA_BUS_FMT_UYVY8_2X8 &&
0158          infmt->code != MEDIA_BUS_FMT_YUYV8_2X8);
0159 }
0160 
0161 /*
0162  * Parses the fwnode endpoint from the source pad of the entity
0163  * connected to this CSI. This will either be the entity directly
0164  * upstream from the CSI-2 receiver, directly upstream from the
0165  * video mux, or directly upstream from the CSI itself. The endpoint
0166  * is needed to determine the bus type and bus config coming into
0167  * the CSI.
0168  */
0169 static int csi_get_upstream_endpoint(struct csi_priv *priv,
0170                      struct v4l2_fwnode_endpoint *ep)
0171 {
0172     struct fwnode_handle *endpoint;
0173     struct v4l2_subdev *sd;
0174     struct media_pad *pad;
0175 
0176     if (!IS_ENABLED(CONFIG_OF))
0177         return -ENXIO;
0178 
0179     if (!priv->src_sd)
0180         return -EPIPE;
0181 
0182     sd = priv->src_sd;
0183 
0184     switch (sd->grp_id) {
0185     case IMX_MEDIA_GRP_ID_CSI_MUX:
0186         /*
0187          * CSI is connected directly to CSI mux, skip up to
0188          * CSI-2 receiver if it is in the path, otherwise stay
0189          * with the CSI mux.
0190          */
0191         sd = imx_media_pipeline_subdev(&sd->entity,
0192                            IMX_MEDIA_GRP_ID_CSI2,
0193                            true);
0194         if (IS_ERR(sd))
0195             sd = priv->src_sd;
0196         break;
0197     case IMX_MEDIA_GRP_ID_CSI2:
0198         break;
0199     default:
0200         /*
0201          * the source is neither the CSI mux nor the CSI-2 receiver,
0202          * get the source pad directly upstream from CSI itself.
0203          */
0204         sd = &priv->sd;
0205         break;
0206     }
0207 
0208     /* get source pad of entity directly upstream from sd */
0209     pad = imx_media_pipeline_pad(&sd->entity, 0, 0, true);
0210     if (!pad)
0211         return -ENODEV;
0212 
0213     endpoint = imx_media_get_pad_fwnode(pad);
0214     if (IS_ERR(endpoint))
0215         return PTR_ERR(endpoint);
0216 
0217     v4l2_fwnode_endpoint_parse(endpoint, ep);
0218 
0219     fwnode_handle_put(endpoint);
0220 
0221     return 0;
0222 }
0223 
0224 static void csi_idmac_put_ipu_resources(struct csi_priv *priv)
0225 {
0226     if (priv->idmac_ch)
0227         ipu_idmac_put(priv->idmac_ch);
0228     priv->idmac_ch = NULL;
0229 
0230     if (priv->smfc)
0231         ipu_smfc_put(priv->smfc);
0232     priv->smfc = NULL;
0233 }
0234 
0235 static int csi_idmac_get_ipu_resources(struct csi_priv *priv)
0236 {
0237     int ch_num, ret;
0238     struct ipu_smfc *smfc;
0239     struct ipuv3_channel *idmac_ch;
0240 
0241     ch_num = IPUV3_CHANNEL_CSI0 + priv->smfc_id;
0242 
0243     smfc = ipu_smfc_get(priv->ipu, ch_num);
0244     if (IS_ERR(smfc)) {
0245         v4l2_err(&priv->sd, "failed to get SMFC\n");
0246         ret = PTR_ERR(smfc);
0247         goto out;
0248     }
0249     priv->smfc = smfc;
0250 
0251     idmac_ch = ipu_idmac_get(priv->ipu, ch_num);
0252     if (IS_ERR(idmac_ch)) {
0253         v4l2_err(&priv->sd, "could not get IDMAC channel %u\n",
0254              ch_num);
0255         ret = PTR_ERR(idmac_ch);
0256         goto out;
0257     }
0258     priv->idmac_ch = idmac_ch;
0259 
0260     return 0;
0261 out:
0262     csi_idmac_put_ipu_resources(priv);
0263     return ret;
0264 }
0265 
0266 static void csi_vb2_buf_done(struct csi_priv *priv)
0267 {
0268     struct imx_media_video_dev *vdev = priv->vdev;
0269     struct imx_media_buffer *done, *next;
0270     struct vb2_buffer *vb;
0271     dma_addr_t phys;
0272 
0273     done = priv->active_vb2_buf[priv->ipu_buf_num];
0274     if (done) {
0275         done->vbuf.field = vdev->fmt.field;
0276         done->vbuf.sequence = priv->frame_sequence;
0277         vb = &done->vbuf.vb2_buf;
0278         vb->timestamp = ktime_get_ns();
0279         vb2_buffer_done(vb, priv->nfb4eof ?
0280                 VB2_BUF_STATE_ERROR : VB2_BUF_STATE_DONE);
0281     }
0282 
0283     priv->frame_sequence++;
0284     priv->nfb4eof = false;
0285 
0286     /* get next queued buffer */
0287     next = imx_media_capture_device_next_buf(vdev);
0288     if (next) {
0289         phys = vb2_dma_contig_plane_dma_addr(&next->vbuf.vb2_buf, 0);
0290         priv->active_vb2_buf[priv->ipu_buf_num] = next;
0291     } else {
0292         phys = priv->underrun_buf.phys;
0293         priv->active_vb2_buf[priv->ipu_buf_num] = NULL;
0294     }
0295 
0296     if (ipu_idmac_buffer_is_ready(priv->idmac_ch, priv->ipu_buf_num))
0297         ipu_idmac_clear_buffer(priv->idmac_ch, priv->ipu_buf_num);
0298 
0299     if (priv->interweave_swap)
0300         phys += vdev->fmt.bytesperline;
0301 
0302     ipu_cpmem_set_buffer(priv->idmac_ch, priv->ipu_buf_num, phys);
0303 }
0304 
0305 static irqreturn_t csi_idmac_eof_interrupt(int irq, void *dev_id)
0306 {
0307     struct csi_priv *priv = dev_id;
0308 
0309     spin_lock(&priv->irqlock);
0310 
0311     if (priv->last_eof) {
0312         complete(&priv->last_eof_comp);
0313         priv->last_eof = false;
0314         goto unlock;
0315     }
0316 
0317     if (priv->fim)
0318         /* call frame interval monitor */
0319         imx_media_fim_eof_monitor(priv->fim, ktime_get());
0320 
0321     csi_vb2_buf_done(priv);
0322 
0323     /* select new IPU buf */
0324     ipu_idmac_select_buffer(priv->idmac_ch, priv->ipu_buf_num);
0325     /* toggle IPU double-buffer index */
0326     priv->ipu_buf_num ^= 1;
0327 
0328     /* bump the EOF timeout timer */
0329     mod_timer(&priv->eof_timeout_timer,
0330           jiffies + msecs_to_jiffies(IMX_MEDIA_EOF_TIMEOUT));
0331 
0332 unlock:
0333     spin_unlock(&priv->irqlock);
0334     return IRQ_HANDLED;
0335 }
0336 
0337 static irqreturn_t csi_idmac_nfb4eof_interrupt(int irq, void *dev_id)
0338 {
0339     struct csi_priv *priv = dev_id;
0340 
0341     spin_lock(&priv->irqlock);
0342 
0343     /*
0344      * this is not an unrecoverable error, just mark
0345      * the next captured frame with vb2 error flag.
0346      */
0347     priv->nfb4eof = true;
0348 
0349     v4l2_err(&priv->sd, "NFB4EOF\n");
0350 
0351     spin_unlock(&priv->irqlock);
0352 
0353     return IRQ_HANDLED;
0354 }
0355 
0356 /*
0357  * EOF timeout timer function. This is an unrecoverable condition
0358  * without a stream restart.
0359  */
0360 static void csi_idmac_eof_timeout(struct timer_list *t)
0361 {
0362     struct csi_priv *priv = from_timer(priv, t, eof_timeout_timer);
0363     struct imx_media_video_dev *vdev = priv->vdev;
0364 
0365     v4l2_err(&priv->sd, "EOF timeout\n");
0366 
0367     /* signal a fatal error to capture device */
0368     imx_media_capture_device_error(vdev);
0369 }
0370 
0371 static void csi_idmac_setup_vb2_buf(struct csi_priv *priv, dma_addr_t *phys)
0372 {
0373     struct imx_media_video_dev *vdev = priv->vdev;
0374     struct imx_media_buffer *buf;
0375     int i;
0376 
0377     for (i = 0; i < 2; i++) {
0378         buf = imx_media_capture_device_next_buf(vdev);
0379         if (buf) {
0380             priv->active_vb2_buf[i] = buf;
0381             phys[i] = vb2_dma_contig_plane_dma_addr(
0382                 &buf->vbuf.vb2_buf, 0);
0383         } else {
0384             priv->active_vb2_buf[i] = NULL;
0385             phys[i] = priv->underrun_buf.phys;
0386         }
0387     }
0388 }
0389 
0390 static void csi_idmac_unsetup_vb2_buf(struct csi_priv *priv,
0391                       enum vb2_buffer_state return_status)
0392 {
0393     struct imx_media_buffer *buf;
0394     int i;
0395 
0396     /* return any remaining active frames with return_status */
0397     for (i = 0; i < 2; i++) {
0398         buf = priv->active_vb2_buf[i];
0399         if (buf) {
0400             struct vb2_buffer *vb = &buf->vbuf.vb2_buf;
0401 
0402             vb->timestamp = ktime_get_ns();
0403             vb2_buffer_done(vb, return_status);
0404         }
0405     }
0406 }
0407 
0408 /* init the SMFC IDMAC channel */
0409 static int csi_idmac_setup_channel(struct csi_priv *priv)
0410 {
0411     struct imx_media_video_dev *vdev = priv->vdev;
0412     const struct imx_media_pixfmt *incc;
0413     struct v4l2_mbus_framefmt *infmt;
0414     struct v4l2_mbus_framefmt *outfmt;
0415     bool passthrough, interweave;
0416     struct ipu_image image;
0417     u32 passthrough_bits;
0418     u32 passthrough_cycles;
0419     dma_addr_t phys[2];
0420     u32 burst_size;
0421     int ret;
0422 
0423     infmt = &priv->format_mbus[CSI_SINK_PAD];
0424     incc = priv->cc[CSI_SINK_PAD];
0425     outfmt = &priv->format_mbus[CSI_SRC_PAD_IDMAC];
0426 
0427     ipu_cpmem_zero(priv->idmac_ch);
0428 
0429     memset(&image, 0, sizeof(image));
0430     image.pix = vdev->fmt;
0431     image.rect = vdev->compose;
0432 
0433     csi_idmac_setup_vb2_buf(priv, phys);
0434 
0435     image.phys0 = phys[0];
0436     image.phys1 = phys[1];
0437 
0438     passthrough = requires_passthrough(&priv->upstream_ep, infmt, incc);
0439     passthrough_cycles = 1;
0440 
0441     /*
0442      * If the field type at capture interface is interlaced, and
0443      * the output IDMAC pad is sequential, enable interweave at
0444      * the IDMAC output channel.
0445      */
0446     interweave = V4L2_FIELD_IS_INTERLACED(image.pix.field) &&
0447         V4L2_FIELD_IS_SEQUENTIAL(outfmt->field);
0448     priv->interweave_swap = interweave &&
0449         image.pix.field == V4L2_FIELD_INTERLACED_BT;
0450 
0451     switch (image.pix.pixelformat) {
0452     case V4L2_PIX_FMT_SBGGR8:
0453     case V4L2_PIX_FMT_SGBRG8:
0454     case V4L2_PIX_FMT_SGRBG8:
0455     case V4L2_PIX_FMT_SRGGB8:
0456     case V4L2_PIX_FMT_GREY:
0457         burst_size = 16;
0458         passthrough_bits = 8;
0459         break;
0460     case V4L2_PIX_FMT_SBGGR16:
0461     case V4L2_PIX_FMT_SGBRG16:
0462     case V4L2_PIX_FMT_SGRBG16:
0463     case V4L2_PIX_FMT_SRGGB16:
0464     case V4L2_PIX_FMT_Y10:
0465     case V4L2_PIX_FMT_Y12:
0466         burst_size = 8;
0467         passthrough_bits = 16;
0468         break;
0469     case V4L2_PIX_FMT_YUV420:
0470     case V4L2_PIX_FMT_YVU420:
0471     case V4L2_PIX_FMT_NV12:
0472         burst_size = (image.pix.width & 0x3f) ?
0473                  ((image.pix.width & 0x1f) ?
0474                   ((image.pix.width & 0xf) ? 8 : 16) : 32) : 64;
0475         passthrough_bits = 16;
0476         /*
0477          * Skip writing U and V components to odd rows (but not
0478          * when enabling IDMAC interweaving, they are incompatible).
0479          */
0480         if (!interweave)
0481             ipu_cpmem_skip_odd_chroma_rows(priv->idmac_ch);
0482         break;
0483     case V4L2_PIX_FMT_YUYV:
0484     case V4L2_PIX_FMT_UYVY:
0485         burst_size = (image.pix.width & 0x1f) ?
0486                  ((image.pix.width & 0xf) ? 8 : 16) : 32;
0487         passthrough_bits = 16;
0488         break;
0489     case V4L2_PIX_FMT_RGB565:
0490         if (passthrough) {
0491             burst_size = 16;
0492             passthrough_bits = 8;
0493             passthrough_cycles = incc->cycles;
0494             break;
0495         }
0496         fallthrough;    /* non-passthrough RGB565 (CSI-2 bus) */
0497     default:
0498         burst_size = (image.pix.width & 0xf) ? 8 : 16;
0499         passthrough_bits = 16;
0500         break;
0501     }
0502 
0503     if (passthrough) {
0504         if (priv->interweave_swap) {
0505             /* start interweave scan at 1st top line (2nd line) */
0506             image.phys0 += image.pix.bytesperline;
0507             image.phys1 += image.pix.bytesperline;
0508         }
0509 
0510         ipu_cpmem_set_resolution(priv->idmac_ch,
0511                      image.rect.width * passthrough_cycles,
0512                      image.rect.height);
0513         ipu_cpmem_set_stride(priv->idmac_ch, image.pix.bytesperline);
0514         ipu_cpmem_set_buffer(priv->idmac_ch, 0, image.phys0);
0515         ipu_cpmem_set_buffer(priv->idmac_ch, 1, image.phys1);
0516         ipu_cpmem_set_format_passthrough(priv->idmac_ch,
0517                          passthrough_bits);
0518     } else {
0519         if (priv->interweave_swap) {
0520             /* start interweave scan at 1st top line (2nd line) */
0521             image.rect.top = 1;
0522         }
0523 
0524         ret = ipu_cpmem_set_image(priv->idmac_ch, &image);
0525         if (ret)
0526             goto unsetup_vb2;
0527     }
0528 
0529     ipu_cpmem_set_burstsize(priv->idmac_ch, burst_size);
0530 
0531     /*
0532      * Set the channel for the direct CSI-->memory via SMFC
0533      * use-case to very high priority, by enabling the watermark
0534      * signal in the SMFC, enabling WM in the channel, and setting
0535      * the channel priority to high.
0536      *
0537      * Refer to the i.mx6 rev. D TRM Table 36-8: Calculated priority
0538      * value.
0539      *
0540      * The WM's are set very low by intention here to ensure that
0541      * the SMFC FIFOs do not overflow.
0542      */
0543     ipu_smfc_set_watermark(priv->smfc, 0x02, 0x01);
0544     ipu_cpmem_set_high_priority(priv->idmac_ch);
0545     ipu_idmac_enable_watermark(priv->idmac_ch, true);
0546     ipu_cpmem_set_axi_id(priv->idmac_ch, 0);
0547 
0548     burst_size = passthrough ?
0549         (burst_size >> 3) - 1 : (burst_size >> 2) - 1;
0550 
0551     ipu_smfc_set_burstsize(priv->smfc, burst_size);
0552 
0553     if (interweave)
0554         ipu_cpmem_interlaced_scan(priv->idmac_ch,
0555                       priv->interweave_swap ?
0556                       -image.pix.bytesperline :
0557                       image.pix.bytesperline,
0558                       image.pix.pixelformat);
0559 
0560     ipu_idmac_set_double_buffer(priv->idmac_ch, true);
0561 
0562     return 0;
0563 
0564 unsetup_vb2:
0565     csi_idmac_unsetup_vb2_buf(priv, VB2_BUF_STATE_QUEUED);
0566     return ret;
0567 }
0568 
0569 static void csi_idmac_unsetup(struct csi_priv *priv,
0570                   enum vb2_buffer_state state)
0571 {
0572     ipu_idmac_disable_channel(priv->idmac_ch);
0573     ipu_smfc_disable(priv->smfc);
0574 
0575     csi_idmac_unsetup_vb2_buf(priv, state);
0576 }
0577 
0578 static int csi_idmac_setup(struct csi_priv *priv)
0579 {
0580     int ret;
0581 
0582     ret = csi_idmac_setup_channel(priv);
0583     if (ret)
0584         return ret;
0585 
0586     ipu_cpmem_dump(priv->idmac_ch);
0587     ipu_dump(priv->ipu);
0588 
0589     ipu_smfc_enable(priv->smfc);
0590 
0591     /* set buffers ready */
0592     ipu_idmac_select_buffer(priv->idmac_ch, 0);
0593     ipu_idmac_select_buffer(priv->idmac_ch, 1);
0594 
0595     /* enable the channels */
0596     ipu_idmac_enable_channel(priv->idmac_ch);
0597 
0598     return 0;
0599 }
0600 
0601 static int csi_idmac_start(struct csi_priv *priv)
0602 {
0603     struct imx_media_video_dev *vdev = priv->vdev;
0604     int ret;
0605 
0606     ret = csi_idmac_get_ipu_resources(priv);
0607     if (ret)
0608         return ret;
0609 
0610     ipu_smfc_map_channel(priv->smfc, priv->csi_id, priv->vc_num);
0611 
0612     ret = imx_media_alloc_dma_buf(priv->dev, &priv->underrun_buf,
0613                       vdev->fmt.sizeimage);
0614     if (ret)
0615         goto out_put_ipu;
0616 
0617     priv->ipu_buf_num = 0;
0618 
0619     /* init EOF completion waitq */
0620     init_completion(&priv->last_eof_comp);
0621     priv->frame_sequence = 0;
0622     priv->last_eof = false;
0623     priv->nfb4eof = false;
0624 
0625     ret = csi_idmac_setup(priv);
0626     if (ret) {
0627         v4l2_err(&priv->sd, "csi_idmac_setup failed: %d\n", ret);
0628         goto out_free_dma_buf;
0629     }
0630 
0631     priv->nfb4eof_irq = ipu_idmac_channel_irq(priv->ipu,
0632                           priv->idmac_ch,
0633                           IPU_IRQ_NFB4EOF);
0634     ret = devm_request_irq(priv->dev, priv->nfb4eof_irq,
0635                    csi_idmac_nfb4eof_interrupt, 0,
0636                    "imx-smfc-nfb4eof", priv);
0637     if (ret) {
0638         v4l2_err(&priv->sd,
0639              "Error registering NFB4EOF irq: %d\n", ret);
0640         goto out_unsetup;
0641     }
0642 
0643     priv->eof_irq = ipu_idmac_channel_irq(priv->ipu, priv->idmac_ch,
0644                           IPU_IRQ_EOF);
0645 
0646     ret = devm_request_irq(priv->dev, priv->eof_irq,
0647                    csi_idmac_eof_interrupt, 0,
0648                    "imx-smfc-eof", priv);
0649     if (ret) {
0650         v4l2_err(&priv->sd,
0651              "Error registering eof irq: %d\n", ret);
0652         goto out_free_nfb4eof_irq;
0653     }
0654 
0655     /* start the EOF timeout timer */
0656     mod_timer(&priv->eof_timeout_timer,
0657           jiffies + msecs_to_jiffies(IMX_MEDIA_EOF_TIMEOUT));
0658 
0659     return 0;
0660 
0661 out_free_nfb4eof_irq:
0662     devm_free_irq(priv->dev, priv->nfb4eof_irq, priv);
0663 out_unsetup:
0664     csi_idmac_unsetup(priv, VB2_BUF_STATE_QUEUED);
0665 out_free_dma_buf:
0666     imx_media_free_dma_buf(priv->dev, &priv->underrun_buf);
0667 out_put_ipu:
0668     csi_idmac_put_ipu_resources(priv);
0669     return ret;
0670 }
0671 
0672 static void csi_idmac_wait_last_eof(struct csi_priv *priv)
0673 {
0674     unsigned long flags;
0675     int ret;
0676 
0677     /* mark next EOF interrupt as the last before stream off */
0678     spin_lock_irqsave(&priv->irqlock, flags);
0679     priv->last_eof = true;
0680     spin_unlock_irqrestore(&priv->irqlock, flags);
0681 
0682     /*
0683      * and then wait for interrupt handler to mark completion.
0684      */
0685     ret = wait_for_completion_timeout(
0686         &priv->last_eof_comp, msecs_to_jiffies(IMX_MEDIA_EOF_TIMEOUT));
0687     if (ret == 0)
0688         v4l2_warn(&priv->sd, "wait last EOF timeout\n");
0689 }
0690 
0691 static void csi_idmac_stop(struct csi_priv *priv)
0692 {
0693     devm_free_irq(priv->dev, priv->eof_irq, priv);
0694     devm_free_irq(priv->dev, priv->nfb4eof_irq, priv);
0695 
0696     csi_idmac_unsetup(priv, VB2_BUF_STATE_ERROR);
0697 
0698     imx_media_free_dma_buf(priv->dev, &priv->underrun_buf);
0699 
0700     /* cancel the EOF timeout timer */
0701     del_timer_sync(&priv->eof_timeout_timer);
0702 
0703     csi_idmac_put_ipu_resources(priv);
0704 }
0705 
0706 /* Update the CSI whole sensor and active windows */
0707 static int csi_setup(struct csi_priv *priv)
0708 {
0709     struct v4l2_mbus_framefmt *infmt, *outfmt;
0710     const struct imx_media_pixfmt *incc;
0711     struct v4l2_mbus_config mbus_cfg;
0712     struct v4l2_mbus_framefmt if_fmt;
0713     struct v4l2_rect crop;
0714 
0715     infmt = &priv->format_mbus[CSI_SINK_PAD];
0716     incc = priv->cc[CSI_SINK_PAD];
0717     outfmt = &priv->format_mbus[priv->active_output_pad];
0718 
0719     /* compose mbus_config from the upstream endpoint */
0720     mbus_cfg.type = priv->upstream_ep.bus_type;
0721     if (is_parallel_bus(&priv->upstream_ep))
0722         mbus_cfg.bus.parallel = priv->upstream_ep.bus.parallel;
0723     else
0724         mbus_cfg.bus.mipi_csi2 = priv->upstream_ep.bus.mipi_csi2;
0725 
0726     if_fmt = *infmt;
0727     crop = priv->crop;
0728 
0729     /*
0730      * if cycles is set, we need to handle this over multiple cycles as
0731      * generic/bayer data
0732      */
0733     if (is_parallel_bus(&priv->upstream_ep) && incc->cycles) {
0734         if_fmt.width *= incc->cycles;
0735         crop.width *= incc->cycles;
0736     }
0737 
0738     ipu_csi_set_window(priv->csi, &crop);
0739 
0740     ipu_csi_set_downsize(priv->csi,
0741                  priv->crop.width == 2 * priv->compose.width,
0742                  priv->crop.height == 2 * priv->compose.height);
0743 
0744     ipu_csi_init_interface(priv->csi, &mbus_cfg, &if_fmt, outfmt);
0745 
0746     ipu_csi_set_dest(priv->csi, priv->dest);
0747 
0748     if (priv->dest == IPU_CSI_DEST_IDMAC)
0749         ipu_csi_set_skip_smfc(priv->csi, priv->skip->skip_smfc,
0750                       priv->skip->max_ratio - 1, 0);
0751 
0752     ipu_csi_dump(priv->csi);
0753 
0754     return 0;
0755 }
0756 
0757 static int csi_start(struct csi_priv *priv)
0758 {
0759     struct v4l2_fract *input_fi, *output_fi;
0760     int ret;
0761 
0762     input_fi = &priv->frame_interval[CSI_SINK_PAD];
0763     output_fi = &priv->frame_interval[priv->active_output_pad];
0764 
0765     /* start upstream */
0766     ret = v4l2_subdev_call(priv->src_sd, video, s_stream, 1);
0767     ret = (ret && ret != -ENOIOCTLCMD) ? ret : 0;
0768     if (ret)
0769         return ret;
0770 
0771     /* Skip first few frames from a BT.656 source */
0772     if (priv->upstream_ep.bus_type == V4L2_MBUS_BT656) {
0773         u32 delay_usec, bad_frames = 20;
0774 
0775         delay_usec = DIV_ROUND_UP_ULL((u64)USEC_PER_SEC *
0776             input_fi->numerator * bad_frames,
0777             input_fi->denominator);
0778 
0779         usleep_range(delay_usec, delay_usec + 1000);
0780     }
0781 
0782     if (priv->dest == IPU_CSI_DEST_IDMAC) {
0783         ret = csi_idmac_start(priv);
0784         if (ret)
0785             goto stop_upstream;
0786     }
0787 
0788     ret = csi_setup(priv);
0789     if (ret)
0790         goto idmac_stop;
0791 
0792     /* start the frame interval monitor */
0793     if (priv->fim && priv->dest == IPU_CSI_DEST_IDMAC) {
0794         ret = imx_media_fim_set_stream(priv->fim, output_fi, true);
0795         if (ret)
0796             goto idmac_stop;
0797     }
0798 
0799     ret = ipu_csi_enable(priv->csi);
0800     if (ret) {
0801         v4l2_err(&priv->sd, "CSI enable error: %d\n", ret);
0802         goto fim_off;
0803     }
0804 
0805     return 0;
0806 
0807 fim_off:
0808     if (priv->fim && priv->dest == IPU_CSI_DEST_IDMAC)
0809         imx_media_fim_set_stream(priv->fim, NULL, false);
0810 idmac_stop:
0811     if (priv->dest == IPU_CSI_DEST_IDMAC)
0812         csi_idmac_stop(priv);
0813 stop_upstream:
0814     v4l2_subdev_call(priv->src_sd, video, s_stream, 0);
0815     return ret;
0816 }
0817 
0818 static void csi_stop(struct csi_priv *priv)
0819 {
0820     if (priv->dest == IPU_CSI_DEST_IDMAC)
0821         csi_idmac_wait_last_eof(priv);
0822 
0823     /*
0824      * Disable the CSI asap, after syncing with the last EOF.
0825      * Doing so after the IDMA channel is disabled has shown to
0826      * create hard system-wide hangs.
0827      */
0828     ipu_csi_disable(priv->csi);
0829 
0830     /* stop upstream */
0831     v4l2_subdev_call(priv->src_sd, video, s_stream, 0);
0832 
0833     if (priv->dest == IPU_CSI_DEST_IDMAC) {
0834         csi_idmac_stop(priv);
0835 
0836         /* stop the frame interval monitor */
0837         if (priv->fim)
0838             imx_media_fim_set_stream(priv->fim, NULL, false);
0839     }
0840 }
0841 
0842 static const struct csi_skip_desc csi_skip[12] = {
0843     { 1, 1, 0x00 }, /* Keep all frames */
0844     { 5, 6, 0x10 }, /* Skip every sixth frame */
0845     { 4, 5, 0x08 }, /* Skip every fifth frame */
0846     { 3, 4, 0x04 }, /* Skip every fourth frame */
0847     { 2, 3, 0x02 }, /* Skip every third frame */
0848     { 3, 5, 0x0a }, /* Skip frames 1 and 3 of every 5 */
0849     { 1, 2, 0x01 }, /* Skip every second frame */
0850     { 2, 5, 0x0b }, /* Keep frames 1 and 4 of every 5 */
0851     { 1, 3, 0x03 }, /* Keep one in three frames */
0852     { 1, 4, 0x07 }, /* Keep one in four frames */
0853     { 1, 5, 0x0f }, /* Keep one in five frames */
0854     { 1, 6, 0x1f }, /* Keep one in six frames */
0855 };
0856 
0857 static void csi_apply_skip_interval(const struct csi_skip_desc *skip,
0858                     struct v4l2_fract *interval)
0859 {
0860     unsigned int div;
0861 
0862     interval->numerator *= skip->max_ratio;
0863     interval->denominator *= skip->keep;
0864 
0865     /* Reduce fraction to lowest terms */
0866     div = gcd(interval->numerator, interval->denominator);
0867     if (div > 1) {
0868         interval->numerator /= div;
0869         interval->denominator /= div;
0870     }
0871 }
0872 
0873 /*
0874  * Find the skip pattern to produce the output frame interval closest to the
0875  * requested one, for the given input frame interval. Updates the output frame
0876  * interval to the exact value.
0877  */
0878 static const struct csi_skip_desc *csi_find_best_skip(struct v4l2_fract *in,
0879                               struct v4l2_fract *out)
0880 {
0881     const struct csi_skip_desc *skip = &csi_skip[0], *best_skip = skip;
0882     u32 min_err = UINT_MAX;
0883     u64 want_us;
0884     int i;
0885 
0886     /* Default to 1:1 ratio */
0887     if (out->numerator == 0 || out->denominator == 0 ||
0888         in->numerator == 0 || in->denominator == 0) {
0889         *out = *in;
0890         return best_skip;
0891     }
0892 
0893     want_us = div_u64((u64)USEC_PER_SEC * out->numerator, out->denominator);
0894 
0895     /* Find the reduction closest to the requested time per frame */
0896     for (i = 0; i < ARRAY_SIZE(csi_skip); i++, skip++) {
0897         u64 tmp, err;
0898 
0899         tmp = div_u64((u64)USEC_PER_SEC * in->numerator *
0900                   skip->max_ratio, in->denominator * skip->keep);
0901 
0902         err = abs((s64)tmp - want_us);
0903         if (err < min_err) {
0904             min_err = err;
0905             best_skip = skip;
0906         }
0907     }
0908 
0909     *out = *in;
0910     csi_apply_skip_interval(best_skip, out);
0911 
0912     return best_skip;
0913 }
0914 
0915 /*
0916  * V4L2 subdev operations.
0917  */
0918 
0919 static int csi_g_frame_interval(struct v4l2_subdev *sd,
0920                 struct v4l2_subdev_frame_interval *fi)
0921 {
0922     struct csi_priv *priv = v4l2_get_subdevdata(sd);
0923 
0924     if (fi->pad >= CSI_NUM_PADS)
0925         return -EINVAL;
0926 
0927     mutex_lock(&priv->lock);
0928 
0929     fi->interval = priv->frame_interval[fi->pad];
0930 
0931     mutex_unlock(&priv->lock);
0932 
0933     return 0;
0934 }
0935 
0936 static int csi_s_frame_interval(struct v4l2_subdev *sd,
0937                 struct v4l2_subdev_frame_interval *fi)
0938 {
0939     struct csi_priv *priv = v4l2_get_subdevdata(sd);
0940     struct v4l2_fract *input_fi;
0941     int ret = 0;
0942 
0943     mutex_lock(&priv->lock);
0944 
0945     input_fi = &priv->frame_interval[CSI_SINK_PAD];
0946 
0947     switch (fi->pad) {
0948     case CSI_SINK_PAD:
0949         /* No limits on valid input frame intervals */
0950         if (fi->interval.numerator == 0 ||
0951             fi->interval.denominator == 0)
0952             fi->interval = *input_fi;
0953         /* Reset output intervals and frame skipping ratio to 1:1 */
0954         priv->frame_interval[CSI_SRC_PAD_IDMAC] = fi->interval;
0955         priv->frame_interval[CSI_SRC_PAD_DIRECT] = fi->interval;
0956         priv->skip = &csi_skip[0];
0957         break;
0958     case CSI_SRC_PAD_IDMAC:
0959         /*
0960          * frame interval at IDMAC output pad depends on input
0961          * interval, modified by frame skipping.
0962          */
0963         priv->skip = csi_find_best_skip(input_fi, &fi->interval);
0964         break;
0965     case CSI_SRC_PAD_DIRECT:
0966         /*
0967          * frame interval at DIRECT output pad is same as input
0968          * interval.
0969          */
0970         fi->interval = *input_fi;
0971         break;
0972     default:
0973         ret = -EINVAL;
0974         goto out;
0975     }
0976 
0977     priv->frame_interval[fi->pad] = fi->interval;
0978 out:
0979     mutex_unlock(&priv->lock);
0980     return ret;
0981 }
0982 
0983 static int csi_s_stream(struct v4l2_subdev *sd, int enable)
0984 {
0985     struct csi_priv *priv = v4l2_get_subdevdata(sd);
0986     int ret = 0;
0987 
0988     mutex_lock(&priv->lock);
0989 
0990     if (!priv->src_sd || !priv->sink) {
0991         ret = -EPIPE;
0992         goto out;
0993     }
0994 
0995     /*
0996      * enable/disable streaming only if stream_count is
0997      * going from 0 to 1 / 1 to 0.
0998      */
0999     if (priv->stream_count != !enable)
1000         goto update_count;
1001 
1002     if (enable) {
1003         dev_dbg(priv->dev, "stream ON\n");
1004         ret = csi_start(priv);
1005         if (ret)
1006             goto out;
1007     } else {
1008         dev_dbg(priv->dev, "stream OFF\n");
1009         csi_stop(priv);
1010     }
1011 
1012 update_count:
1013     priv->stream_count += enable ? 1 : -1;
1014     if (priv->stream_count < 0)
1015         priv->stream_count = 0;
1016 out:
1017     mutex_unlock(&priv->lock);
1018     return ret;
1019 }
1020 
1021 static int csi_link_setup(struct media_entity *entity,
1022               const struct media_pad *local,
1023               const struct media_pad *remote, u32 flags)
1024 {
1025     struct v4l2_subdev *sd = media_entity_to_v4l2_subdev(entity);
1026     struct csi_priv *priv = v4l2_get_subdevdata(sd);
1027     struct v4l2_subdev *remote_sd;
1028     int ret = 0;
1029 
1030     dev_dbg(priv->dev, "link setup %s -> %s\n", remote->entity->name,
1031         local->entity->name);
1032 
1033     mutex_lock(&priv->lock);
1034 
1035     if (local->flags & MEDIA_PAD_FL_SINK) {
1036         if (!is_media_entity_v4l2_subdev(remote->entity)) {
1037             ret = -EINVAL;
1038             goto out;
1039         }
1040 
1041         remote_sd = media_entity_to_v4l2_subdev(remote->entity);
1042 
1043         if (flags & MEDIA_LNK_FL_ENABLED) {
1044             if (priv->src_sd) {
1045                 ret = -EBUSY;
1046                 goto out;
1047             }
1048             priv->src_sd = remote_sd;
1049         } else {
1050             priv->src_sd = NULL;
1051         }
1052 
1053         goto out;
1054     }
1055 
1056     /* this is a source pad */
1057 
1058     if (flags & MEDIA_LNK_FL_ENABLED) {
1059         if (priv->sink) {
1060             ret = -EBUSY;
1061             goto out;
1062         }
1063     } else {
1064         v4l2_ctrl_handler_free(&priv->ctrl_hdlr);
1065         v4l2_ctrl_handler_init(&priv->ctrl_hdlr, 0);
1066         priv->sink = NULL;
1067         /* do not apply IC burst alignment in csi_try_crop */
1068         priv->active_output_pad = CSI_SRC_PAD_IDMAC;
1069         goto out;
1070     }
1071 
1072     /* record which output pad is now active */
1073     priv->active_output_pad = local->index;
1074 
1075     /* set CSI destination */
1076     if (local->index == CSI_SRC_PAD_IDMAC) {
1077         if (!is_media_entity_v4l2_video_device(remote->entity)) {
1078             ret = -EINVAL;
1079             goto out;
1080         }
1081 
1082         if (priv->fim) {
1083             ret = imx_media_fim_add_controls(priv->fim);
1084             if (ret)
1085                 goto out;
1086         }
1087 
1088         priv->dest = IPU_CSI_DEST_IDMAC;
1089     } else {
1090         if (!is_media_entity_v4l2_subdev(remote->entity)) {
1091             ret = -EINVAL;
1092             goto out;
1093         }
1094 
1095         remote_sd = media_entity_to_v4l2_subdev(remote->entity);
1096         switch (remote_sd->grp_id) {
1097         case IMX_MEDIA_GRP_ID_IPU_VDIC:
1098             priv->dest = IPU_CSI_DEST_VDIC;
1099             break;
1100         case IMX_MEDIA_GRP_ID_IPU_IC_PRP:
1101             priv->dest = IPU_CSI_DEST_IC;
1102             break;
1103         default:
1104             ret = -EINVAL;
1105             goto out;
1106         }
1107     }
1108 
1109     priv->sink = remote->entity;
1110 out:
1111     mutex_unlock(&priv->lock);
1112     return ret;
1113 }
1114 
1115 static int csi_link_validate(struct v4l2_subdev *sd,
1116                  struct media_link *link,
1117                  struct v4l2_subdev_format *source_fmt,
1118                  struct v4l2_subdev_format *sink_fmt)
1119 {
1120     struct csi_priv *priv = v4l2_get_subdevdata(sd);
1121     struct v4l2_fwnode_endpoint upstream_ep = { .bus_type = 0 };
1122     bool is_csi2;
1123     int ret;
1124 
1125     ret = v4l2_subdev_link_validate_default(sd, link,
1126                         source_fmt, sink_fmt);
1127     if (ret)
1128         return ret;
1129 
1130     ret = csi_get_upstream_endpoint(priv, &upstream_ep);
1131     if (ret) {
1132         v4l2_err(&priv->sd, "failed to find upstream endpoint\n");
1133         return ret;
1134     }
1135 
1136     mutex_lock(&priv->lock);
1137 
1138     priv->upstream_ep = upstream_ep;
1139     is_csi2 = !is_parallel_bus(&upstream_ep);
1140     if (is_csi2) {
1141         /*
1142          * NOTE! It seems the virtual channels from the mipi csi-2
1143          * receiver are used only for routing by the video mux's,
1144          * or for hard-wired routing to the CSI's. Once the stream
1145          * enters the CSI's however, they are treated internally
1146          * in the IPU as virtual channel 0.
1147          */
1148         ipu_csi_set_mipi_datatype(priv->csi, 0,
1149                       &priv->format_mbus[CSI_SINK_PAD]);
1150     }
1151 
1152     /* select either parallel or MIPI-CSI2 as input to CSI */
1153     ipu_set_csi_src_mux(priv->ipu, priv->csi_id, is_csi2);
1154 
1155     mutex_unlock(&priv->lock);
1156     return ret;
1157 }
1158 
1159 static struct v4l2_mbus_framefmt *
1160 __csi_get_fmt(struct csi_priv *priv, struct v4l2_subdev_state *sd_state,
1161           unsigned int pad, enum v4l2_subdev_format_whence which)
1162 {
1163     if (which == V4L2_SUBDEV_FORMAT_TRY)
1164         return v4l2_subdev_get_try_format(&priv->sd, sd_state, pad);
1165     else
1166         return &priv->format_mbus[pad];
1167 }
1168 
1169 static struct v4l2_rect *
1170 __csi_get_crop(struct csi_priv *priv, struct v4l2_subdev_state *sd_state,
1171            enum v4l2_subdev_format_whence which)
1172 {
1173     if (which == V4L2_SUBDEV_FORMAT_TRY)
1174         return v4l2_subdev_get_try_crop(&priv->sd, sd_state,
1175                         CSI_SINK_PAD);
1176     else
1177         return &priv->crop;
1178 }
1179 
1180 static struct v4l2_rect *
1181 __csi_get_compose(struct csi_priv *priv, struct v4l2_subdev_state *sd_state,
1182           enum v4l2_subdev_format_whence which)
1183 {
1184     if (which == V4L2_SUBDEV_FORMAT_TRY)
1185         return v4l2_subdev_get_try_compose(&priv->sd, sd_state,
1186                            CSI_SINK_PAD);
1187     else
1188         return &priv->compose;
1189 }
1190 
1191 static void csi_try_crop(struct csi_priv *priv,
1192              struct v4l2_rect *crop,
1193              struct v4l2_subdev_state *sd_state,
1194              struct v4l2_mbus_framefmt *infmt,
1195              struct v4l2_fwnode_endpoint *upstream_ep)
1196 {
1197     u32 in_height;
1198 
1199     crop->width = min_t(__u32, infmt->width, crop->width);
1200     if (crop->left + crop->width > infmt->width)
1201         crop->left = infmt->width - crop->width;
1202     /* adjust crop left/width to h/w alignment restrictions */
1203     crop->left &= ~0x3;
1204     if (priv->active_output_pad == CSI_SRC_PAD_DIRECT)
1205         crop->width &= ~0x7; /* multiple of 8 pixels (IC burst) */
1206     else
1207         crop->width &= ~0x1; /* multiple of 2 pixels */
1208 
1209     in_height = infmt->height;
1210     if (infmt->field == V4L2_FIELD_ALTERNATE)
1211         in_height *= 2;
1212 
1213     /*
1214      * FIXME: not sure why yet, but on interlaced bt.656,
1215      * changing the vertical cropping causes loss of vertical
1216      * sync, so fix it to NTSC/PAL active lines. NTSC contains
1217      * 2 extra lines of active video that need to be cropped.
1218      */
1219     if (upstream_ep->bus_type == V4L2_MBUS_BT656 &&
1220         (V4L2_FIELD_HAS_BOTH(infmt->field) ||
1221          infmt->field == V4L2_FIELD_ALTERNATE)) {
1222         crop->height = in_height;
1223         crop->top = (in_height == 480) ? 2 : 0;
1224     } else {
1225         crop->height = min_t(__u32, in_height, crop->height);
1226         if (crop->top + crop->height > in_height)
1227             crop->top = in_height - crop->height;
1228     }
1229 }
1230 
1231 static int csi_enum_mbus_code(struct v4l2_subdev *sd,
1232                   struct v4l2_subdev_state *sd_state,
1233                   struct v4l2_subdev_mbus_code_enum *code)
1234 {
1235     struct csi_priv *priv = v4l2_get_subdevdata(sd);
1236     struct v4l2_fwnode_endpoint upstream_ep = { .bus_type = 0 };
1237     const struct imx_media_pixfmt *incc;
1238     struct v4l2_mbus_framefmt *infmt;
1239     int ret = 0;
1240 
1241     mutex_lock(&priv->lock);
1242 
1243     infmt = __csi_get_fmt(priv, sd_state, CSI_SINK_PAD, code->which);
1244     incc = imx_media_find_mbus_format(infmt->code, PIXFMT_SEL_ANY);
1245 
1246     switch (code->pad) {
1247     case CSI_SINK_PAD:
1248         ret = imx_media_enum_mbus_formats(&code->code, code->index,
1249                           PIXFMT_SEL_ANY);
1250         break;
1251     case CSI_SRC_PAD_DIRECT:
1252     case CSI_SRC_PAD_IDMAC:
1253         ret = csi_get_upstream_endpoint(priv, &upstream_ep);
1254         if (ret) {
1255             v4l2_err(&priv->sd, "failed to find upstream endpoint\n");
1256             goto out;
1257         }
1258 
1259         if (requires_passthrough(&upstream_ep, infmt, incc)) {
1260             if (code->index != 0) {
1261                 ret = -EINVAL;
1262                 goto out;
1263             }
1264             code->code = infmt->code;
1265         } else {
1266             enum imx_pixfmt_sel fmt_sel =
1267                 (incc->cs == IPUV3_COLORSPACE_YUV) ?
1268                 PIXFMT_SEL_YUV : PIXFMT_SEL_RGB;
1269 
1270             ret = imx_media_enum_ipu_formats(&code->code,
1271                              code->index,
1272                              fmt_sel);
1273         }
1274         break;
1275     default:
1276         ret = -EINVAL;
1277     }
1278 
1279 out:
1280     mutex_unlock(&priv->lock);
1281     return ret;
1282 }
1283 
1284 static int csi_enum_frame_size(struct v4l2_subdev *sd,
1285                    struct v4l2_subdev_state *sd_state,
1286                    struct v4l2_subdev_frame_size_enum *fse)
1287 {
1288     struct csi_priv *priv = v4l2_get_subdevdata(sd);
1289     struct v4l2_rect *crop;
1290     int ret = 0;
1291 
1292     if (fse->pad >= CSI_NUM_PADS ||
1293         fse->index > (fse->pad == CSI_SINK_PAD ? 0 : 3))
1294         return -EINVAL;
1295 
1296     mutex_lock(&priv->lock);
1297 
1298     if (fse->pad == CSI_SINK_PAD) {
1299         fse->min_width = MIN_W;
1300         fse->max_width = MAX_W;
1301         fse->min_height = MIN_H;
1302         fse->max_height = MAX_H;
1303     } else {
1304         crop = __csi_get_crop(priv, sd_state, fse->which);
1305 
1306         fse->min_width = fse->index & 1 ?
1307             crop->width / 2 : crop->width;
1308         fse->max_width = fse->min_width;
1309         fse->min_height = fse->index & 2 ?
1310             crop->height / 2 : crop->height;
1311         fse->max_height = fse->min_height;
1312     }
1313 
1314     mutex_unlock(&priv->lock);
1315     return ret;
1316 }
1317 
1318 static int csi_enum_frame_interval(struct v4l2_subdev *sd,
1319                    struct v4l2_subdev_state *sd_state,
1320                    struct v4l2_subdev_frame_interval_enum *fie)
1321 {
1322     struct csi_priv *priv = v4l2_get_subdevdata(sd);
1323     struct v4l2_fract *input_fi;
1324     struct v4l2_rect *crop;
1325     int ret = 0;
1326 
1327     if (fie->pad >= CSI_NUM_PADS ||
1328         fie->index >= (fie->pad != CSI_SRC_PAD_IDMAC ?
1329                1 : ARRAY_SIZE(csi_skip)))
1330         return -EINVAL;
1331 
1332     mutex_lock(&priv->lock);
1333 
1334     input_fi = &priv->frame_interval[CSI_SINK_PAD];
1335     crop = __csi_get_crop(priv, sd_state, fie->which);
1336 
1337     if ((fie->width != crop->width && fie->width != crop->width / 2) ||
1338         (fie->height != crop->height && fie->height != crop->height / 2)) {
1339         ret = -EINVAL;
1340         goto out;
1341     }
1342 
1343     fie->interval = *input_fi;
1344 
1345     if (fie->pad == CSI_SRC_PAD_IDMAC)
1346         csi_apply_skip_interval(&csi_skip[fie->index],
1347                     &fie->interval);
1348 
1349 out:
1350     mutex_unlock(&priv->lock);
1351     return ret;
1352 }
1353 
1354 static int csi_get_fmt(struct v4l2_subdev *sd,
1355                struct v4l2_subdev_state *sd_state,
1356                struct v4l2_subdev_format *sdformat)
1357 {
1358     struct csi_priv *priv = v4l2_get_subdevdata(sd);
1359     struct v4l2_mbus_framefmt *fmt;
1360     int ret = 0;
1361 
1362     if (sdformat->pad >= CSI_NUM_PADS)
1363         return -EINVAL;
1364 
1365     mutex_lock(&priv->lock);
1366 
1367     fmt = __csi_get_fmt(priv, sd_state, sdformat->pad, sdformat->which);
1368     if (!fmt) {
1369         ret = -EINVAL;
1370         goto out;
1371     }
1372 
1373     sdformat->format = *fmt;
1374 out:
1375     mutex_unlock(&priv->lock);
1376     return ret;
1377 }
1378 
1379 static void csi_try_field(struct csi_priv *priv,
1380               struct v4l2_subdev_state *sd_state,
1381               struct v4l2_subdev_format *sdformat)
1382 {
1383     struct v4l2_mbus_framefmt *infmt =
1384         __csi_get_fmt(priv, sd_state, CSI_SINK_PAD, sdformat->which);
1385 
1386     /*
1387      * no restrictions on sink pad field type except must
1388      * be initialized.
1389      */
1390     if (sdformat->pad == CSI_SINK_PAD) {
1391         if (sdformat->format.field == V4L2_FIELD_ANY)
1392             sdformat->format.field = V4L2_FIELD_NONE;
1393         return;
1394     }
1395 
1396     switch (infmt->field) {
1397     case V4L2_FIELD_SEQ_TB:
1398     case V4L2_FIELD_SEQ_BT:
1399         /*
1400          * If the user requests sequential at the source pad,
1401          * allow it (along with possibly inverting field order).
1402          * Otherwise passthrough the field type.
1403          */
1404         if (!V4L2_FIELD_IS_SEQUENTIAL(sdformat->format.field))
1405             sdformat->format.field = infmt->field;
1406         break;
1407     case V4L2_FIELD_ALTERNATE:
1408         /*
1409          * This driver does not support alternate field mode, and
1410          * the CSI captures a whole frame, so the CSI never presents
1411          * alternate mode at its source pads. If user has not
1412          * already requested sequential, translate ALTERNATE at
1413          * sink pad to SEQ_TB or SEQ_BT at the source pad depending
1414          * on input height (assume NTSC BT order if 480 total active
1415          * frame lines, otherwise PAL TB order).
1416          */
1417         if (!V4L2_FIELD_IS_SEQUENTIAL(sdformat->format.field))
1418             sdformat->format.field = (infmt->height == 480 / 2) ?
1419                 V4L2_FIELD_SEQ_BT : V4L2_FIELD_SEQ_TB;
1420         break;
1421     default:
1422         /* Passthrough for all other input field types */
1423         sdformat->format.field = infmt->field;
1424         break;
1425     }
1426 }
1427 
1428 static void csi_try_fmt(struct csi_priv *priv,
1429             struct v4l2_fwnode_endpoint *upstream_ep,
1430             struct v4l2_subdev_state *sd_state,
1431             struct v4l2_subdev_format *sdformat,
1432             struct v4l2_rect *crop,
1433             struct v4l2_rect *compose,
1434             const struct imx_media_pixfmt **cc)
1435 {
1436     const struct imx_media_pixfmt *incc;
1437     struct v4l2_mbus_framefmt *infmt;
1438     u32 code;
1439 
1440     infmt = __csi_get_fmt(priv, sd_state, CSI_SINK_PAD, sdformat->which);
1441 
1442     switch (sdformat->pad) {
1443     case CSI_SRC_PAD_DIRECT:
1444     case CSI_SRC_PAD_IDMAC:
1445         incc = imx_media_find_mbus_format(infmt->code, PIXFMT_SEL_ANY);
1446 
1447         sdformat->format.width = compose->width;
1448         sdformat->format.height = compose->height;
1449 
1450         if (requires_passthrough(upstream_ep, infmt, incc)) {
1451             sdformat->format.code = infmt->code;
1452             *cc = incc;
1453         } else {
1454             enum imx_pixfmt_sel fmt_sel =
1455                 (incc->cs == IPUV3_COLORSPACE_YUV) ?
1456                 PIXFMT_SEL_YUV : PIXFMT_SEL_RGB;
1457 
1458             *cc = imx_media_find_ipu_format(sdformat->format.code,
1459                             fmt_sel);
1460             if (!*cc) {
1461                 imx_media_enum_ipu_formats(&code, 0, fmt_sel);
1462                 *cc = imx_media_find_ipu_format(code, fmt_sel);
1463                 sdformat->format.code = (*cc)->codes[0];
1464             }
1465         }
1466 
1467         csi_try_field(priv, sd_state, sdformat);
1468 
1469         /* propagate colorimetry from sink */
1470         sdformat->format.colorspace = infmt->colorspace;
1471         sdformat->format.xfer_func = infmt->xfer_func;
1472         sdformat->format.quantization = infmt->quantization;
1473         sdformat->format.ycbcr_enc = infmt->ycbcr_enc;
1474 
1475         break;
1476     case CSI_SINK_PAD:
1477         v4l_bound_align_image(&sdformat->format.width, MIN_W, MAX_W,
1478                       W_ALIGN, &sdformat->format.height,
1479                       MIN_H, MAX_H, H_ALIGN, S_ALIGN);
1480 
1481         *cc = imx_media_find_mbus_format(sdformat->format.code,
1482                          PIXFMT_SEL_ANY);
1483         if (!*cc) {
1484             imx_media_enum_mbus_formats(&code, 0,
1485                             PIXFMT_SEL_YUV_RGB);
1486             *cc = imx_media_find_mbus_format(code,
1487                              PIXFMT_SEL_YUV_RGB);
1488             sdformat->format.code = (*cc)->codes[0];
1489         }
1490 
1491         csi_try_field(priv, sd_state, sdformat);
1492 
1493         /* Reset crop and compose rectangles */
1494         crop->left = 0;
1495         crop->top = 0;
1496         crop->width = sdformat->format.width;
1497         crop->height = sdformat->format.height;
1498         if (sdformat->format.field == V4L2_FIELD_ALTERNATE)
1499             crop->height *= 2;
1500         csi_try_crop(priv, crop, sd_state, &sdformat->format,
1501                  upstream_ep);
1502         compose->left = 0;
1503         compose->top = 0;
1504         compose->width = crop->width;
1505         compose->height = crop->height;
1506 
1507         break;
1508     }
1509 
1510     imx_media_try_colorimetry(&sdformat->format,
1511             priv->active_output_pad == CSI_SRC_PAD_DIRECT);
1512 }
1513 
1514 static int csi_set_fmt(struct v4l2_subdev *sd,
1515                struct v4l2_subdev_state *sd_state,
1516                struct v4l2_subdev_format *sdformat)
1517 {
1518     struct csi_priv *priv = v4l2_get_subdevdata(sd);
1519     struct v4l2_fwnode_endpoint upstream_ep = { .bus_type = 0 };
1520     const struct imx_media_pixfmt *cc;
1521     struct v4l2_mbus_framefmt *fmt;
1522     struct v4l2_rect *crop, *compose;
1523     int ret;
1524 
1525     if (sdformat->pad >= CSI_NUM_PADS)
1526         return -EINVAL;
1527 
1528     ret = csi_get_upstream_endpoint(priv, &upstream_ep);
1529     if (ret) {
1530         v4l2_err(&priv->sd, "failed to find upstream endpoint\n");
1531         return ret;
1532     }
1533 
1534     mutex_lock(&priv->lock);
1535 
1536     if (priv->stream_count > 0) {
1537         ret = -EBUSY;
1538         goto out;
1539     }
1540 
1541     crop = __csi_get_crop(priv, sd_state, sdformat->which);
1542     compose = __csi_get_compose(priv, sd_state, sdformat->which);
1543 
1544     csi_try_fmt(priv, &upstream_ep, sd_state, sdformat, crop, compose,
1545             &cc);
1546 
1547     fmt = __csi_get_fmt(priv, sd_state, sdformat->pad, sdformat->which);
1548     *fmt = sdformat->format;
1549 
1550     if (sdformat->pad == CSI_SINK_PAD) {
1551         int pad;
1552 
1553         /* propagate format to source pads */
1554         for (pad = CSI_SINK_PAD + 1; pad < CSI_NUM_PADS; pad++) {
1555             const struct imx_media_pixfmt *outcc;
1556             struct v4l2_mbus_framefmt *outfmt;
1557             struct v4l2_subdev_format format;
1558 
1559             format.pad = pad;
1560             format.which = sdformat->which;
1561             format.format = sdformat->format;
1562             csi_try_fmt(priv, &upstream_ep, sd_state, &format,
1563                     NULL, compose, &outcc);
1564 
1565             outfmt = __csi_get_fmt(priv, sd_state, pad,
1566                            sdformat->which);
1567             *outfmt = format.format;
1568 
1569             if (sdformat->which == V4L2_SUBDEV_FORMAT_ACTIVE)
1570                 priv->cc[pad] = outcc;
1571         }
1572     }
1573 
1574     if (sdformat->which == V4L2_SUBDEV_FORMAT_ACTIVE)
1575         priv->cc[sdformat->pad] = cc;
1576 
1577 out:
1578     mutex_unlock(&priv->lock);
1579     return ret;
1580 }
1581 
1582 static int csi_get_selection(struct v4l2_subdev *sd,
1583                  struct v4l2_subdev_state *sd_state,
1584                  struct v4l2_subdev_selection *sel)
1585 {
1586     struct csi_priv *priv = v4l2_get_subdevdata(sd);
1587     struct v4l2_mbus_framefmt *infmt;
1588     struct v4l2_rect *crop, *compose;
1589     int ret = 0;
1590 
1591     if (sel->pad != CSI_SINK_PAD)
1592         return -EINVAL;
1593 
1594     mutex_lock(&priv->lock);
1595 
1596     infmt = __csi_get_fmt(priv, sd_state, CSI_SINK_PAD, sel->which);
1597     crop = __csi_get_crop(priv, sd_state, sel->which);
1598     compose = __csi_get_compose(priv, sd_state, sel->which);
1599 
1600     switch (sel->target) {
1601     case V4L2_SEL_TGT_CROP_BOUNDS:
1602         sel->r.left = 0;
1603         sel->r.top = 0;
1604         sel->r.width = infmt->width;
1605         sel->r.height = infmt->height;
1606         if (infmt->field == V4L2_FIELD_ALTERNATE)
1607             sel->r.height *= 2;
1608         break;
1609     case V4L2_SEL_TGT_CROP:
1610         sel->r = *crop;
1611         break;
1612     case V4L2_SEL_TGT_COMPOSE_BOUNDS:
1613         sel->r.left = 0;
1614         sel->r.top = 0;
1615         sel->r.width = crop->width;
1616         sel->r.height = crop->height;
1617         break;
1618     case V4L2_SEL_TGT_COMPOSE:
1619         sel->r = *compose;
1620         break;
1621     default:
1622         ret = -EINVAL;
1623     }
1624 
1625     mutex_unlock(&priv->lock);
1626     return ret;
1627 }
1628 
1629 static int csi_set_scale(u32 *compose, u32 crop, u32 flags)
1630 {
1631     if ((flags & (V4L2_SEL_FLAG_LE | V4L2_SEL_FLAG_GE)) ==
1632              (V4L2_SEL_FLAG_LE | V4L2_SEL_FLAG_GE) &&
1633         *compose != crop && *compose != crop / 2)
1634         return -ERANGE;
1635 
1636     if (*compose <= crop / 2 ||
1637         (*compose < crop * 3 / 4 && !(flags & V4L2_SEL_FLAG_GE)) ||
1638         (*compose < crop && (flags & V4L2_SEL_FLAG_LE)))
1639         *compose = crop / 2;
1640     else
1641         *compose = crop;
1642 
1643     return 0;
1644 }
1645 
1646 static int csi_set_selection(struct v4l2_subdev *sd,
1647                  struct v4l2_subdev_state *sd_state,
1648                  struct v4l2_subdev_selection *sel)
1649 {
1650     struct csi_priv *priv = v4l2_get_subdevdata(sd);
1651     struct v4l2_fwnode_endpoint upstream_ep = { .bus_type = 0 };
1652     struct v4l2_mbus_framefmt *infmt;
1653     struct v4l2_rect *crop, *compose;
1654     int pad, ret;
1655 
1656     if (sel->pad != CSI_SINK_PAD)
1657         return -EINVAL;
1658 
1659     ret = csi_get_upstream_endpoint(priv, &upstream_ep);
1660     if (ret) {
1661         v4l2_err(&priv->sd, "failed to find upstream endpoint\n");
1662         return ret;
1663     }
1664 
1665     mutex_lock(&priv->lock);
1666 
1667     if (priv->stream_count > 0) {
1668         ret = -EBUSY;
1669         goto out;
1670     }
1671 
1672     infmt = __csi_get_fmt(priv, sd_state, CSI_SINK_PAD, sel->which);
1673     crop = __csi_get_crop(priv, sd_state, sel->which);
1674     compose = __csi_get_compose(priv, sd_state, sel->which);
1675 
1676     switch (sel->target) {
1677     case V4L2_SEL_TGT_CROP:
1678         /*
1679          * Modifying the crop rectangle always changes the format on
1680          * the source pads. If the KEEP_CONFIG flag is set, just return
1681          * the current crop rectangle.
1682          */
1683         if (sel->flags & V4L2_SEL_FLAG_KEEP_CONFIG) {
1684             sel->r = priv->crop;
1685             if (sel->which == V4L2_SUBDEV_FORMAT_TRY)
1686                 *crop = sel->r;
1687             goto out;
1688         }
1689 
1690         csi_try_crop(priv, &sel->r, sd_state, infmt, &upstream_ep);
1691 
1692         *crop = sel->r;
1693 
1694         /* Reset scaling to 1:1 */
1695         compose->width = crop->width;
1696         compose->height = crop->height;
1697         break;
1698     case V4L2_SEL_TGT_COMPOSE:
1699         /*
1700          * Modifying the compose rectangle always changes the format on
1701          * the source pads. If the KEEP_CONFIG flag is set, just return
1702          * the current compose rectangle.
1703          */
1704         if (sel->flags & V4L2_SEL_FLAG_KEEP_CONFIG) {
1705             sel->r = priv->compose;
1706             if (sel->which == V4L2_SUBDEV_FORMAT_TRY)
1707                 *compose = sel->r;
1708             goto out;
1709         }
1710 
1711         sel->r.left = 0;
1712         sel->r.top = 0;
1713         ret = csi_set_scale(&sel->r.width, crop->width, sel->flags);
1714         if (ret)
1715             goto out;
1716         ret = csi_set_scale(&sel->r.height, crop->height, sel->flags);
1717         if (ret)
1718             goto out;
1719 
1720         *compose = sel->r;
1721         break;
1722     default:
1723         ret = -EINVAL;
1724         goto out;
1725     }
1726 
1727     /* Reset source pads to sink compose rectangle */
1728     for (pad = CSI_SINK_PAD + 1; pad < CSI_NUM_PADS; pad++) {
1729         struct v4l2_mbus_framefmt *outfmt;
1730 
1731         outfmt = __csi_get_fmt(priv, sd_state, pad, sel->which);
1732         outfmt->width = compose->width;
1733         outfmt->height = compose->height;
1734     }
1735 
1736 out:
1737     mutex_unlock(&priv->lock);
1738     return ret;
1739 }
1740 
1741 static int csi_subscribe_event(struct v4l2_subdev *sd, struct v4l2_fh *fh,
1742                    struct v4l2_event_subscription *sub)
1743 {
1744     if (sub->type != V4L2_EVENT_IMX_FRAME_INTERVAL_ERROR)
1745         return -EINVAL;
1746     if (sub->id != 0)
1747         return -EINVAL;
1748 
1749     return v4l2_event_subscribe(fh, sub, 0, NULL);
1750 }
1751 
1752 static int csi_unsubscribe_event(struct v4l2_subdev *sd, struct v4l2_fh *fh,
1753                  struct v4l2_event_subscription *sub)
1754 {
1755     return v4l2_event_unsubscribe(fh, sub);
1756 }
1757 
1758 static int csi_registered(struct v4l2_subdev *sd)
1759 {
1760     struct csi_priv *priv = v4l2_get_subdevdata(sd);
1761     struct ipu_csi *csi;
1762     int i, ret;
1763     u32 code;
1764 
1765     /* get handle to IPU CSI */
1766     csi = ipu_csi_get(priv->ipu, priv->csi_id);
1767     if (IS_ERR(csi)) {
1768         v4l2_err(&priv->sd, "failed to get CSI%d\n", priv->csi_id);
1769         return PTR_ERR(csi);
1770     }
1771     priv->csi = csi;
1772 
1773     for (i = 0; i < CSI_NUM_PADS; i++) {
1774         code = 0;
1775         if (i != CSI_SINK_PAD)
1776             imx_media_enum_ipu_formats(&code, 0, PIXFMT_SEL_YUV);
1777 
1778         /* set a default mbus format  */
1779         ret = imx_media_init_mbus_fmt(&priv->format_mbus[i],
1780                           IMX_MEDIA_DEF_PIX_WIDTH,
1781                           IMX_MEDIA_DEF_PIX_HEIGHT, code,
1782                           V4L2_FIELD_NONE, &priv->cc[i]);
1783         if (ret)
1784             goto put_csi;
1785 
1786         /* init default frame interval */
1787         priv->frame_interval[i].numerator = 1;
1788         priv->frame_interval[i].denominator = 30;
1789     }
1790 
1791     /* disable frame skipping */
1792     priv->skip = &csi_skip[0];
1793 
1794     /* init default crop and compose rectangle sizes */
1795     priv->crop.width = IMX_MEDIA_DEF_PIX_WIDTH;
1796     priv->crop.height = IMX_MEDIA_DEF_PIX_HEIGHT;
1797     priv->compose.width = IMX_MEDIA_DEF_PIX_WIDTH;
1798     priv->compose.height = IMX_MEDIA_DEF_PIX_HEIGHT;
1799 
1800     priv->fim = imx_media_fim_init(&priv->sd);
1801     if (IS_ERR(priv->fim)) {
1802         ret = PTR_ERR(priv->fim);
1803         goto put_csi;
1804     }
1805 
1806     priv->vdev = imx_media_capture_device_init(priv->sd.dev, &priv->sd,
1807                            CSI_SRC_PAD_IDMAC, true);
1808     if (IS_ERR(priv->vdev)) {
1809         ret = PTR_ERR(priv->vdev);
1810         goto free_fim;
1811     }
1812 
1813     ret = imx_media_capture_device_register(priv->vdev, 0);
1814     if (ret)
1815         goto remove_vdev;
1816 
1817     return 0;
1818 
1819 remove_vdev:
1820     imx_media_capture_device_remove(priv->vdev);
1821 free_fim:
1822     if (priv->fim)
1823         imx_media_fim_free(priv->fim);
1824 put_csi:
1825     ipu_csi_put(priv->csi);
1826     return ret;
1827 }
1828 
1829 static void csi_unregistered(struct v4l2_subdev *sd)
1830 {
1831     struct csi_priv *priv = v4l2_get_subdevdata(sd);
1832 
1833     imx_media_capture_device_unregister(priv->vdev);
1834     imx_media_capture_device_remove(priv->vdev);
1835 
1836     if (priv->fim)
1837         imx_media_fim_free(priv->fim);
1838 
1839     if (priv->csi)
1840         ipu_csi_put(priv->csi);
1841 }
1842 
1843 /*
1844  * The CSI has only one fwnode endpoint, at the sink pad. Verify the
1845  * endpoint belongs to us, and return CSI_SINK_PAD.
1846  */
1847 static int csi_get_fwnode_pad(struct media_entity *entity,
1848                   struct fwnode_endpoint *endpoint)
1849 {
1850     struct v4l2_subdev *sd = media_entity_to_v4l2_subdev(entity);
1851     struct csi_priv *priv = v4l2_get_subdevdata(sd);
1852     struct fwnode_handle *csi_port = dev_fwnode(priv->dev);
1853     struct fwnode_handle *csi_ep;
1854     int ret;
1855 
1856     csi_ep = fwnode_get_next_child_node(csi_port, NULL);
1857 
1858     ret = endpoint->local_fwnode == csi_ep ? CSI_SINK_PAD : -ENXIO;
1859 
1860     fwnode_handle_put(csi_ep);
1861 
1862     return ret;
1863 }
1864 
1865 static const struct media_entity_operations csi_entity_ops = {
1866     .link_setup = csi_link_setup,
1867     .link_validate = v4l2_subdev_link_validate,
1868     .get_fwnode_pad = csi_get_fwnode_pad,
1869 };
1870 
1871 static const struct v4l2_subdev_core_ops csi_core_ops = {
1872     .subscribe_event = csi_subscribe_event,
1873     .unsubscribe_event = csi_unsubscribe_event,
1874 };
1875 
1876 static const struct v4l2_subdev_video_ops csi_video_ops = {
1877     .g_frame_interval = csi_g_frame_interval,
1878     .s_frame_interval = csi_s_frame_interval,
1879     .s_stream = csi_s_stream,
1880 };
1881 
1882 static const struct v4l2_subdev_pad_ops csi_pad_ops = {
1883     .init_cfg = imx_media_init_cfg,
1884     .enum_mbus_code = csi_enum_mbus_code,
1885     .enum_frame_size = csi_enum_frame_size,
1886     .enum_frame_interval = csi_enum_frame_interval,
1887     .get_fmt = csi_get_fmt,
1888     .set_fmt = csi_set_fmt,
1889     .get_selection = csi_get_selection,
1890     .set_selection = csi_set_selection,
1891     .link_validate = csi_link_validate,
1892 };
1893 
1894 static const struct v4l2_subdev_ops csi_subdev_ops = {
1895     .core = &csi_core_ops,
1896     .video = &csi_video_ops,
1897     .pad = &csi_pad_ops,
1898 };
1899 
1900 static const struct v4l2_subdev_internal_ops csi_internal_ops = {
1901     .registered = csi_registered,
1902     .unregistered = csi_unregistered,
1903 };
1904 
1905 static int imx_csi_notify_bound(struct v4l2_async_notifier *notifier,
1906                 struct v4l2_subdev *sd,
1907                 struct v4l2_async_subdev *asd)
1908 {
1909     struct csi_priv *priv = notifier_to_dev(notifier);
1910     struct media_pad *sink = &priv->sd.entity.pads[CSI_SINK_PAD];
1911 
1912     /*
1913      * If the subdev is a video mux, it must be one of the CSI
1914      * muxes. Mark it as such via its group id.
1915      */
1916     if (sd->entity.function == MEDIA_ENT_F_VID_MUX)
1917         sd->grp_id = IMX_MEDIA_GRP_ID_CSI_MUX;
1918 
1919     return v4l2_create_fwnode_links_to_pad(sd, sink, 0);
1920 }
1921 
1922 static const struct v4l2_async_notifier_operations csi_notify_ops = {
1923     .bound = imx_csi_notify_bound,
1924 };
1925 
1926 static int imx_csi_async_register(struct csi_priv *priv)
1927 {
1928     struct v4l2_async_subdev *asd = NULL;
1929     struct fwnode_handle *ep;
1930     unsigned int port;
1931     int ret;
1932 
1933     v4l2_async_nf_init(&priv->notifier);
1934 
1935     /* get this CSI's port id */
1936     ret = fwnode_property_read_u32(dev_fwnode(priv->dev), "reg", &port);
1937     if (ret < 0)
1938         return ret;
1939 
1940     ep = fwnode_graph_get_endpoint_by_id(dev_fwnode(priv->dev->parent),
1941                          port, 0,
1942                          FWNODE_GRAPH_ENDPOINT_NEXT);
1943     if (ep) {
1944         asd = v4l2_async_nf_add_fwnode_remote(&priv->notifier, ep,
1945                               struct v4l2_async_subdev);
1946 
1947         fwnode_handle_put(ep);
1948 
1949         if (IS_ERR(asd)) {
1950             ret = PTR_ERR(asd);
1951             /* OK if asd already exists */
1952             if (ret != -EEXIST)
1953                 return ret;
1954         }
1955     }
1956 
1957     priv->notifier.ops = &csi_notify_ops;
1958 
1959     ret = v4l2_async_subdev_nf_register(&priv->sd, &priv->notifier);
1960     if (ret)
1961         return ret;
1962 
1963     return v4l2_async_register_subdev(&priv->sd);
1964 }
1965 
1966 static int imx_csi_probe(struct platform_device *pdev)
1967 {
1968     struct ipu_client_platformdata *pdata;
1969     struct pinctrl *pinctrl;
1970     struct csi_priv *priv;
1971     int i, ret;
1972 
1973     priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL);
1974     if (!priv)
1975         return -ENOMEM;
1976 
1977     platform_set_drvdata(pdev, &priv->sd);
1978     priv->dev = &pdev->dev;
1979 
1980     ret = dma_set_coherent_mask(priv->dev, DMA_BIT_MASK(32));
1981     if (ret)
1982         return ret;
1983 
1984     /* get parent IPU */
1985     priv->ipu = dev_get_drvdata(priv->dev->parent);
1986 
1987     /* get our CSI id */
1988     pdata = priv->dev->platform_data;
1989     priv->csi_id = pdata->csi;
1990     priv->smfc_id = (priv->csi_id == 0) ? 0 : 2;
1991 
1992     priv->active_output_pad = CSI_SRC_PAD_IDMAC;
1993 
1994     timer_setup(&priv->eof_timeout_timer, csi_idmac_eof_timeout, 0);
1995     spin_lock_init(&priv->irqlock);
1996 
1997     v4l2_subdev_init(&priv->sd, &csi_subdev_ops);
1998     v4l2_set_subdevdata(&priv->sd, priv);
1999     priv->sd.internal_ops = &csi_internal_ops;
2000     priv->sd.entity.ops = &csi_entity_ops;
2001     priv->sd.entity.function = MEDIA_ENT_F_PROC_VIDEO_PIXEL_FORMATTER;
2002     priv->sd.dev = &pdev->dev;
2003     priv->sd.fwnode = of_fwnode_handle(pdata->of_node);
2004     priv->sd.owner = THIS_MODULE;
2005     priv->sd.flags = V4L2_SUBDEV_FL_HAS_DEVNODE | V4L2_SUBDEV_FL_HAS_EVENTS;
2006     priv->sd.grp_id = priv->csi_id ?
2007         IMX_MEDIA_GRP_ID_IPU_CSI1 : IMX_MEDIA_GRP_ID_IPU_CSI0;
2008     imx_media_grp_id_to_sd_name(priv->sd.name, sizeof(priv->sd.name),
2009                     priv->sd.grp_id, ipu_get_num(priv->ipu));
2010 
2011     for (i = 0; i < CSI_NUM_PADS; i++)
2012         priv->pad[i].flags = (i == CSI_SINK_PAD) ?
2013             MEDIA_PAD_FL_SINK : MEDIA_PAD_FL_SOURCE;
2014 
2015     ret = media_entity_pads_init(&priv->sd.entity, CSI_NUM_PADS,
2016                      priv->pad);
2017     if (ret)
2018         return ret;
2019 
2020     mutex_init(&priv->lock);
2021 
2022     v4l2_ctrl_handler_init(&priv->ctrl_hdlr, 0);
2023     priv->sd.ctrl_handler = &priv->ctrl_hdlr;
2024 
2025     /*
2026      * The IPUv3 driver did not assign an of_node to this
2027      * device. As a result, pinctrl does not automatically
2028      * configure our pin groups, so we need to do that manually
2029      * here, after setting this device's of_node.
2030      */
2031     priv->dev->of_node = pdata->of_node;
2032     pinctrl = devm_pinctrl_get_select_default(priv->dev);
2033     if (IS_ERR(pinctrl)) {
2034         ret = PTR_ERR(pinctrl);
2035         dev_dbg(priv->dev,
2036             "devm_pinctrl_get_select_default() failed: %d\n", ret);
2037         if (ret != -ENODEV)
2038             goto free;
2039     }
2040 
2041     ret = imx_csi_async_register(priv);
2042     if (ret)
2043         goto cleanup;
2044 
2045     return 0;
2046 
2047 cleanup:
2048     v4l2_async_nf_unregister(&priv->notifier);
2049     v4l2_async_nf_cleanup(&priv->notifier);
2050 free:
2051     v4l2_ctrl_handler_free(&priv->ctrl_hdlr);
2052     mutex_destroy(&priv->lock);
2053     return ret;
2054 }
2055 
2056 static int imx_csi_remove(struct platform_device *pdev)
2057 {
2058     struct v4l2_subdev *sd = platform_get_drvdata(pdev);
2059     struct csi_priv *priv = sd_to_dev(sd);
2060 
2061     v4l2_ctrl_handler_free(&priv->ctrl_hdlr);
2062     mutex_destroy(&priv->lock);
2063     v4l2_async_nf_unregister(&priv->notifier);
2064     v4l2_async_nf_cleanup(&priv->notifier);
2065     v4l2_async_unregister_subdev(sd);
2066     media_entity_cleanup(&sd->entity);
2067 
2068     return 0;
2069 }
2070 
2071 static const struct platform_device_id imx_csi_ids[] = {
2072     { .name = "imx-ipuv3-csi" },
2073     { },
2074 };
2075 MODULE_DEVICE_TABLE(platform, imx_csi_ids);
2076 
2077 static struct platform_driver imx_csi_driver = {
2078     .probe = imx_csi_probe,
2079     .remove = imx_csi_remove,
2080     .id_table = imx_csi_ids,
2081     .driver = {
2082         .name = "imx-ipuv3-csi",
2083     },
2084 };
2085 module_platform_driver(imx_csi_driver);
2086 
2087 MODULE_DESCRIPTION("i.MX CSI subdev driver");
2088 MODULE_AUTHOR("Steve Longerbeam <steve_longerbeam@mentor.com>");
2089 MODULE_LICENSE("GPL");
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