// SPDX-License-Identifier: GPL-2.0+
/*
 * V4L2 Capture IC Preprocess Subdev for Freescale i.MX5/6 SOC
 *
 * This subdevice handles capture of video frames from the CSI or VDIC,
 * which are routed directly to the Image Converter preprocess tasks,
 * for resizing, colorspace conversion, and rotation.
 *
 * Copyright (c) 2012-2017 Mentor Graphics Inc.
 */
#include <linux/delay.h>
#include <linux/interrupt.h>
#include <linux/module.h>
#include <linux/sched.h>
#include <linux/slab.h>
#include <linux/spinlock.h>
#include <linux/timer.h>
#include <media/v4l2-ctrls.h>
#include <media/v4l2-device.h>
#include <media/v4l2-ioctl.h>
#include <media/v4l2-mc.h>
#include <media/v4l2-subdev.h>
#include <media/imx.h>
#include "imx-media.h"
#include "imx-ic.h"

/*
 * Min/Max supported width and heights.
 *
 * We allow planar output, so we have to align width at the source pad
 * by 16 pixels to meet IDMAC alignment requirements for possible planar
 * output.
 *
 * TODO: move this into pad format negotiation, if capture device
 * has not requested a planar format, we should allow 8 pixel
 * alignment at the source pad.
 */
#define MIN_W_SINK   32
#define MIN_H_SINK   32
#define MAX_W_SINK 4096
#define MAX_H_SINK 4096
#define W_ALIGN_SINK  3 /* multiple of 8 pixels */
#define H_ALIGN_SINK  1 /* multiple of 2 lines */

#define MAX_W_SRC  1024
#define MAX_H_SRC  1024
#define W_ALIGN_SRC   1 /* multiple of 2 pixels */
#define H_ALIGN_SRC   1 /* multiple of 2 lines */

#define S_ALIGN       1 /* multiple of 2 */

struct prp_priv {
        struct imx_ic_priv *ic_priv;
        struct media_pad pad[PRPENCVF_NUM_PADS];
        /* the video device at output pad */
        struct imx_media_video_dev *vdev;

        /* lock to protect all members below */
        struct mutex lock;

        /* IPU units we require */
        struct ipu_ic *ic;
        struct ipuv3_channel *out_ch;
        struct ipuv3_channel *rot_in_ch;
        struct ipuv3_channel *rot_out_ch;

        /* active vb2 buffers to send to video dev sink */
        struct imx_media_buffer *active_vb2_buf[2];
        struct imx_media_dma_buf underrun_buf;

        int ipu_buf_num;  /* ipu double buffer index: 0-1 */

        /* the sink for the captured frames */
        struct media_entity *sink;
        /* the source subdev */
        struct v4l2_subdev *src_sd;

        struct v4l2_mbus_framefmt format_mbus[PRPENCVF_NUM_PADS];
        const struct imx_media_pixfmt *cc[PRPENCVF_NUM_PADS];
        struct v4l2_fract frame_interval;

        struct imx_media_dma_buf rot_buf[2];

        /* controls */
        struct v4l2_ctrl_handler ctrl_hdlr;
        int  rotation; /* degrees */
        bool hflip;
        bool vflip;

        /* derived from rotation, hflip, vflip controls */
        enum ipu_rotate_mode rot_mode;

        spinlock_t irqlock; /* protect eof_irq handler */

        struct timer_list eof_timeout_timer;
        int eof_irq;
        int nfb4eof_irq;

        int stream_count;
        u32 frame_sequence; /* frame sequence counter */
        bool last_eof;  /* waiting for last EOF at stream off */
        bool nfb4eof;    /* NFB4EOF encountered during streaming */
        bool interweave_swap; /* swap top/bottom lines when interweaving */
        struct completion last_eof_comp;
};

static const struct prp_channels {
        u32 out_ch;
        u32 rot_in_ch;
        u32 rot_out_ch;
} prp_channel[] = {
        [IC_TASK_ENCODER] = {
                .out_ch = IPUV3_CHANNEL_IC_PRP_ENC_MEM,
                .rot_in_ch = IPUV3_CHANNEL_MEM_ROT_ENC,
                .rot_out_ch = IPUV3_CHANNEL_ROT_ENC_MEM,
        },
        [IC_TASK_VIEWFINDER] = {
                .out_ch = IPUV3_CHANNEL_IC_PRP_VF_MEM,
                .rot_in_ch = IPUV3_CHANNEL_MEM_ROT_VF,
                .rot_out_ch = IPUV3_CHANNEL_ROT_VF_MEM,
        },
};

static inline struct prp_priv *sd_to_priv(struct v4l2_subdev *sd)
{
        struct imx_ic_priv *ic_priv = v4l2_get_subdevdata(sd);

        return ic_priv->task_priv;
}

static void prp_put_ipu_resources(struct prp_priv *priv)
{
        if (priv->ic)
                ipu_ic_put(priv->ic);
        priv->ic = NULL;

        if (priv->out_ch)
                ipu_idmac_put(priv->out_ch);
        priv->out_ch = NULL;

        if (priv->rot_in_ch)
                ipu_idmac_put(priv->rot_in_ch);
        priv->rot_in_ch = NULL;

        if (priv->rot_out_ch)
                ipu_idmac_put(priv->rot_out_ch);
        priv->rot_out_ch = NULL;
}

static int prp_get_ipu_resources(struct prp_priv *priv)
{
        struct imx_ic_priv *ic_priv = priv->ic_priv;
        struct ipu_ic *ic;
        struct ipuv3_channel *out_ch, *rot_in_ch, *rot_out_ch;
        int ret, task = ic_priv->task_id;

        ic = ipu_ic_get(ic_priv->ipu, task);
        if (IS_ERR(ic)) {
                v4l2_err(&ic_priv->sd, "failed to get IC\n");
                ret = PTR_ERR(ic);
                goto out;
        }
        priv->ic = ic;

        out_ch = ipu_idmac_get(ic_priv->ipu, prp_channel[task].out_ch);
        if (IS_ERR(out_ch)) {
                v4l2_err(&ic_priv->sd, "could not get IDMAC channel %u\n",
                         prp_channel[task].out_ch);
                ret = PTR_ERR(out_ch);
                goto out;
        }
        priv->out_ch = out_ch;

        rot_in_ch = ipu_idmac_get(ic_priv->ipu, prp_channel[task].rot_in_ch);
        if (IS_ERR(rot_in_ch)) {
                v4l2_err(&ic_priv->sd, "could not get IDMAC channel %u\n",
                         prp_channel[task].rot_in_ch);
                ret = PTR_ERR(rot_in_ch);
                goto out;
        }
        priv->rot_in_ch = rot_in_ch;

        rot_out_ch = ipu_idmac_get(ic_priv->ipu, prp_channel[task].rot_out_ch);
        if (IS_ERR(rot_out_ch)) {
                v4l2_err(&ic_priv->sd, "could not get IDMAC channel %u\n",
                         prp_channel[task].rot_out_ch);
                ret = PTR_ERR(rot_out_ch);
                goto out;
        }
        priv->rot_out_ch = rot_out_ch;

        return 0;
out:
        prp_put_ipu_resources(priv);
        return ret;
}

static void prp_vb2_buf_done(struct prp_priv *priv, struct ipuv3_channel *ch)
{
        struct imx_media_video_dev *vdev = priv->vdev;
        struct imx_media_buffer *done, *next;
        struct vb2_buffer *vb;
        dma_addr_t phys;

        done = priv->active_vb2_buf[priv->ipu_buf_num];
        if (done) {
                done->vbuf.field = vdev->fmt.field;
                done->vbuf.sequence = priv->frame_sequence;
                vb = &done->vbuf.vb2_buf;
                vb->timestamp = ktime_get_ns();
                vb2_buffer_done(vb, priv->nfb4eof ?
                                VB2_BUF_STATE_ERROR : VB2_BUF_STATE_DONE);
        }

        priv->frame_sequence++;
        priv->nfb4eof = false;

        /* get next queued buffer */
        next = imx_media_capture_device_next_buf(vdev);
        if (next) {
                phys = vb2_dma_contig_plane_dma_addr(&next->vbuf.vb2_buf, 0);
                priv->active_vb2_buf[priv->ipu_buf_num] = next;
        } else {
                phys = priv->underrun_buf.phys;
                priv->active_vb2_buf[priv->ipu_buf_num] = NULL;
        }

        if (ipu_idmac_buffer_is_ready(ch, priv->ipu_buf_num))
                ipu_idmac_clear_buffer(ch, priv->ipu_buf_num);

        if (priv->interweave_swap && ch == priv->out_ch)
                phys += vdev->fmt.bytesperline;

        ipu_cpmem_set_buffer(ch, priv->ipu_buf_num, phys);
}

static irqreturn_t prp_eof_interrupt(int irq, void *dev_id)
{
        struct prp_priv *priv = dev_id;
        struct ipuv3_channel *channel;

        spin_lock(&priv->irqlock);

        if (priv->last_eof) {
                complete(&priv->last_eof_comp);
                priv->last_eof = false;
                goto unlock;
        }

        channel = (ipu_rot_mode_is_irt(priv->rot_mode)) ?
                priv->rot_out_ch : priv->out_ch;

        prp_vb2_buf_done(priv, channel);

        /* select new IPU buf */
        ipu_idmac_select_buffer(channel, priv->ipu_buf_num);
        /* toggle IPU double-buffer index */
        priv->ipu_buf_num ^= 1;

        /* bump the EOF timeout timer */
        mod_timer(&priv->eof_timeout_timer,
                  jiffies + msecs_to_jiffies(IMX_MEDIA_EOF_TIMEOUT));

unlock:
        spin_unlock(&priv->irqlock);
        return IRQ_HANDLED;
}

static irqreturn_t prp_nfb4eof_interrupt(int irq, void *dev_id)
{
        struct prp_priv *priv = dev_id;
        struct imx_ic_priv *ic_priv = priv->ic_priv;

        spin_lock(&priv->irqlock);

        /*
         * this is not an unrecoverable error, just mark
         * the next captured frame with vb2 error flag.
         */
        priv->nfb4eof = true;

        v4l2_err(&ic_priv->sd, "NFB4EOF\n");

        spin_unlock(&priv->irqlock);

        return IRQ_HANDLED;
}

/*
 * EOF timeout timer function.
 */
/*
 * EOF timeout timer function. This is an unrecoverable condition
 * without a stream restart.
 */
static void prp_eof_timeout(struct timer_list *t)
{
        struct prp_priv *priv = timer_container_of(priv, t, eof_timeout_timer);
        struct imx_media_video_dev *vdev = priv->vdev;
        struct imx_ic_priv *ic_priv = priv->ic_priv;

        v4l2_err(&ic_priv->sd, "EOF timeout\n");

        /* signal a fatal error to capture device */
        imx_media_capture_device_error(vdev);
}

static void prp_setup_vb2_buf(struct prp_priv *priv, dma_addr_t *phys)
{
        struct imx_media_video_dev *vdev = priv->vdev;
        struct imx_media_buffer *buf;
        int i;

        for (i = 0; i < 2; i++) {
                buf = imx_media_capture_device_next_buf(vdev);
                if (buf) {
                        priv->active_vb2_buf[i] = buf;
                        phys[i] = vb2_dma_contig_plane_dma_addr(
                                &buf->vbuf.vb2_buf, 0);
                } else {
                        priv->active_vb2_buf[i] = NULL;
                        phys[i] = priv->underrun_buf.phys;
                }
        }
}

static void prp_unsetup_vb2_buf(struct prp_priv *priv,
                                enum vb2_buffer_state return_status)
{
        struct imx_media_buffer *buf;
        int i;

        /* return any remaining active frames with return_status */
        for (i = 0; i < 2; i++) {
                buf = priv->active_vb2_buf[i];
                if (buf) {
                        struct vb2_buffer *vb = &buf->vbuf.vb2_buf;

                        vb->timestamp = ktime_get_ns();
                        vb2_buffer_done(vb, return_status);
                }
        }
}

static int prp_setup_channel(struct prp_priv *priv,
                             struct ipuv3_channel *channel,
                             enum ipu_rotate_mode rot_mode,
                             dma_addr_t addr0, dma_addr_t addr1,
                             bool rot_swap_width_height)
{
        struct imx_media_video_dev *vdev = priv->vdev;
        const struct imx_media_pixfmt *outcc;
        struct v4l2_mbus_framefmt *outfmt;
        unsigned int burst_size;
        struct ipu_image image;
        bool interweave;
        int ret;

        outfmt = &priv->format_mbus[PRPENCVF_SRC_PAD];
        outcc = vdev->cc;

        ipu_cpmem_zero(channel);

        memset(&image, 0, sizeof(image));
        image.pix = vdev->fmt;
        image.rect = vdev->compose;

        /*
         * If the field type at capture interface is interlaced, and
         * the output IDMAC pad is sequential, enable interweave at
         * the IDMAC output channel.
         */
        interweave = V4L2_FIELD_IS_INTERLACED(image.pix.field) &&
                V4L2_FIELD_IS_SEQUENTIAL(outfmt->field);
        priv->interweave_swap = interweave &&
                image.pix.field == V4L2_FIELD_INTERLACED_BT;

        if (rot_swap_width_height) {
                swap(image.pix.width, image.pix.height);
                swap(image.rect.width, image.rect.height);
                /* recalc stride using swapped width */
                image.pix.bytesperline = outcc->planar ?
                        image.pix.width :
                        (image.pix.width * outcc->bpp) >> 3;
        }

        if (priv->interweave_swap && channel == priv->out_ch) {
                /* start interweave scan at 1st top line (2nd line) */
                image.rect.top = 1;
        }

        image.phys0 = addr0;
        image.phys1 = addr1;

        /*
         * Skip writing U and V components to odd rows in the output
         * channels for planar 4:2:0 (but not when enabling IDMAC
         * interweaving, they are incompatible).
         */
        if ((channel == priv->out_ch && !interweave) ||
            channel == priv->rot_out_ch) {
                switch (image.pix.pixelformat) {
                case V4L2_PIX_FMT_YUV420:
                case V4L2_PIX_FMT_YVU420:
                case V4L2_PIX_FMT_NV12:
                        ipu_cpmem_skip_odd_chroma_rows(channel);
                        break;
                }
        }

        ret = ipu_cpmem_set_image(channel, &image);
        if (ret)
                return ret;

        if (channel == priv->rot_in_ch ||
            channel == priv->rot_out_ch) {
                burst_size = 8;
                ipu_cpmem_set_block_mode(channel);
        } else {
                burst_size = (image.pix.width & 0xf) ? 8 : 16;
        }

        ipu_cpmem_set_burstsize(channel, burst_size);

        if (rot_mode)
                ipu_cpmem_set_rotation(channel, rot_mode);

        if (interweave && channel == priv->out_ch)
                ipu_cpmem_interlaced_scan(channel,
                                          priv->interweave_swap ?
                                          -image.pix.bytesperline :
                                          image.pix.bytesperline,
                                          image.pix.pixelformat);

        ret = ipu_ic_task_idma_init(priv->ic, channel,
                                    image.pix.width, image.pix.height,
                                    burst_size, rot_mode);
        if (ret)
                return ret;

        ipu_cpmem_set_axi_id(channel, 1);

        ipu_idmac_set_double_buffer(channel, true);

        return 0;
}

static int prp_setup_rotation(struct prp_priv *priv)
{
        struct imx_media_video_dev *vdev = priv->vdev;
        struct imx_ic_priv *ic_priv = priv->ic_priv;
        const struct imx_media_pixfmt *outcc, *incc;
        struct v4l2_mbus_framefmt *infmt;
        struct v4l2_pix_format *outfmt;
        struct ipu_ic_csc csc;
        dma_addr_t phys[2];
        int ret;

        infmt = &priv->format_mbus[PRPENCVF_SINK_PAD];
        outfmt = &vdev->fmt;
        incc = priv->cc[PRPENCVF_SINK_PAD];
        outcc = vdev->cc;

        ret = ipu_ic_calc_csc(&csc,
                              infmt->ycbcr_enc, infmt->quantization,
                              incc->cs,
                              outfmt->ycbcr_enc, outfmt->quantization,
                              outcc->cs);
        if (ret) {
                v4l2_err(&ic_priv->sd, "ipu_ic_calc_csc failed, %d\n",
                         ret);
                return ret;
        }

        ret = imx_media_alloc_dma_buf(ic_priv->ipu_dev, &priv->rot_buf[0],
                                      outfmt->sizeimage);
        if (ret) {
                v4l2_err(&ic_priv->sd, "failed to alloc rot_buf[0], %d\n", ret);
                return ret;
        }
        ret = imx_media_alloc_dma_buf(ic_priv->ipu_dev, &priv->rot_buf[1],
                                      outfmt->sizeimage);
        if (ret) {
                v4l2_err(&ic_priv->sd, "failed to alloc rot_buf[1], %d\n", ret);
                goto free_rot0;
        }

        ret = ipu_ic_task_init(priv->ic, &csc,
                               infmt->width, infmt->height,
                               outfmt->height, outfmt->width);
        if (ret) {
                v4l2_err(&ic_priv->sd, "ipu_ic_task_init failed, %d\n", ret);
                goto free_rot1;
        }

        /* init the IC-PRP-->MEM IDMAC channel */
        ret = prp_setup_channel(priv, priv->out_ch, IPU_ROTATE_NONE,
                                priv->rot_buf[0].phys, priv->rot_buf[1].phys,
                                true);
        if (ret) {
                v4l2_err(&ic_priv->sd,
                         "prp_setup_channel(out_ch) failed, %d\n", ret);
                goto free_rot1;
        }

        /* init the MEM-->IC-PRP ROT IDMAC channel */
        ret = prp_setup_channel(priv, priv->rot_in_ch, priv->rot_mode,
                                priv->rot_buf[0].phys, priv->rot_buf[1].phys,
                                true);
        if (ret) {
                v4l2_err(&ic_priv->sd,
                         "prp_setup_channel(rot_in_ch) failed, %d\n", ret);
                goto free_rot1;
        }

        prp_setup_vb2_buf(priv, phys);

        /* init the destination IC-PRP ROT-->MEM IDMAC channel */
        ret = prp_setup_channel(priv, priv->rot_out_ch, IPU_ROTATE_NONE,
                                phys[0], phys[1],
                                false);
        if (ret) {
                v4l2_err(&ic_priv->sd,
                         "prp_setup_channel(rot_out_ch) failed, %d\n", ret);
                goto unsetup_vb2;
        }

        /* now link IC-PRP-->MEM to MEM-->IC-PRP ROT */
        ipu_idmac_link(priv->out_ch, priv->rot_in_ch);

        /* enable the IC */
        ipu_ic_enable(priv->ic);

        /* set buffers ready */
        ipu_idmac_select_buffer(priv->out_ch, 0);
        ipu_idmac_select_buffer(priv->out_ch, 1);
        ipu_idmac_select_buffer(priv->rot_out_ch, 0);
        ipu_idmac_select_buffer(priv->rot_out_ch, 1);

        /* enable the channels */
        ipu_idmac_enable_channel(priv->out_ch);
        ipu_idmac_enable_channel(priv->rot_in_ch);
        ipu_idmac_enable_channel(priv->rot_out_ch);

        /* and finally enable the IC PRP task */
        ipu_ic_task_enable(priv->ic);

        return 0;

unsetup_vb2:
        prp_unsetup_vb2_buf(priv, VB2_BUF_STATE_QUEUED);
free_rot1:
        imx_media_free_dma_buf(ic_priv->ipu_dev, &priv->rot_buf[1]);
free_rot0:
        imx_media_free_dma_buf(ic_priv->ipu_dev, &priv->rot_buf[0]);
        return ret;
}

static void prp_unsetup_rotation(struct prp_priv *priv)
{
        struct imx_ic_priv *ic_priv = priv->ic_priv;

        ipu_ic_task_disable(priv->ic);

        ipu_idmac_disable_channel(priv->out_ch);
        ipu_idmac_disable_channel(priv->rot_in_ch);
        ipu_idmac_disable_channel(priv->rot_out_ch);

        ipu_idmac_unlink(priv->out_ch, priv->rot_in_ch);

        ipu_ic_disable(priv->ic);

        imx_media_free_dma_buf(ic_priv->ipu_dev, &priv->rot_buf[0]);
        imx_media_free_dma_buf(ic_priv->ipu_dev, &priv->rot_buf[1]);
}

static int prp_setup_norotation(struct prp_priv *priv)
{
        struct imx_media_video_dev *vdev = priv->vdev;
        struct imx_ic_priv *ic_priv = priv->ic_priv;
        const struct imx_media_pixfmt *outcc, *incc;
        struct v4l2_mbus_framefmt *infmt;
        struct v4l2_pix_format *outfmt;
        struct ipu_ic_csc csc;
        dma_addr_t phys[2];
        int ret;

        infmt = &priv->format_mbus[PRPENCVF_SINK_PAD];
        outfmt = &vdev->fmt;
        incc = priv->cc[PRPENCVF_SINK_PAD];
        outcc = vdev->cc;

        ret = ipu_ic_calc_csc(&csc,
                              infmt->ycbcr_enc, infmt->quantization,
                              incc->cs,
                              outfmt->ycbcr_enc, outfmt->quantization,
                              outcc->cs);
        if (ret) {
                v4l2_err(&ic_priv->sd, "ipu_ic_calc_csc failed, %d\n",
                         ret);
                return ret;
        }

        ret = ipu_ic_task_init(priv->ic, &csc,
                               infmt->width, infmt->height,
                               outfmt->width, outfmt->height);
        if (ret) {
                v4l2_err(&ic_priv->sd, "ipu_ic_task_init failed, %d\n", ret);
                return ret;
        }

        prp_setup_vb2_buf(priv, phys);

        /* init the IC PRP-->MEM IDMAC channel */
        ret = prp_setup_channel(priv, priv->out_ch, priv->rot_mode,
                                phys[0], phys[1], false);
        if (ret) {
                v4l2_err(&ic_priv->sd,
                         "prp_setup_channel(out_ch) failed, %d\n", ret);
                goto unsetup_vb2;
        }

        ipu_cpmem_dump(priv->out_ch);
        ipu_ic_dump(priv->ic);
        ipu_dump(ic_priv->ipu);

        ipu_ic_enable(priv->ic);

        /* set buffers ready */
        ipu_idmac_select_buffer(priv->out_ch, 0);
        ipu_idmac_select_buffer(priv->out_ch, 1);

        /* enable the channels */
        ipu_idmac_enable_channel(priv->out_ch);

        /* enable the IC task */
        ipu_ic_task_enable(priv->ic);

        return 0;

unsetup_vb2:
        prp_unsetup_vb2_buf(priv, VB2_BUF_STATE_QUEUED);
        return ret;
}

static void prp_unsetup_norotation(struct prp_priv *priv)
{
        ipu_ic_task_disable(priv->ic);
        ipu_idmac_disable_channel(priv->out_ch);
        ipu_ic_disable(priv->ic);
}

static void prp_unsetup(struct prp_priv *priv,
                        enum vb2_buffer_state state)
{
        if (ipu_rot_mode_is_irt(priv->rot_mode))
                prp_unsetup_rotation(priv);
        else
                prp_unsetup_norotation(priv);

        prp_unsetup_vb2_buf(priv, state);
}

static int prp_start(struct prp_priv *priv)
{
        struct imx_ic_priv *ic_priv = priv->ic_priv;
        struct imx_media_video_dev *vdev = priv->vdev;
        int ret;

        ret = prp_get_ipu_resources(priv);
        if (ret)
                return ret;

        ret = imx_media_alloc_dma_buf(ic_priv->ipu_dev, &priv->underrun_buf,
                                      vdev->fmt.sizeimage);
        if (ret)
                goto out_put_ipu;

        priv->ipu_buf_num = 0;

        /* init EOF completion waitq */
        init_completion(&priv->last_eof_comp);
        priv->frame_sequence = 0;
        priv->last_eof = false;
        priv->nfb4eof = false;

        if (ipu_rot_mode_is_irt(priv->rot_mode))
                ret = prp_setup_rotation(priv);
        else
                ret = prp_setup_norotation(priv);
        if (ret)
                goto out_free_underrun;

        priv->nfb4eof_irq = ipu_idmac_channel_irq(ic_priv->ipu,
                                                  priv->out_ch,
                                                  IPU_IRQ_NFB4EOF);
        ret = devm_request_irq(ic_priv->ipu_dev, priv->nfb4eof_irq,
                               prp_nfb4eof_interrupt, 0,
                               "imx-ic-prp-nfb4eof", priv);
        if (ret) {
                v4l2_err(&ic_priv->sd,
                         "Error registering NFB4EOF irq: %d\n", ret);
                goto out_unsetup;
        }

        if (ipu_rot_mode_is_irt(priv->rot_mode))
                priv->eof_irq = ipu_idmac_channel_irq(
                        ic_priv->ipu, priv->rot_out_ch, IPU_IRQ_EOF);
        else
                priv->eof_irq = ipu_idmac_channel_irq(
                        ic_priv->ipu, priv->out_ch, IPU_IRQ_EOF);

        ret = devm_request_irq(ic_priv->ipu_dev, priv->eof_irq,
                               prp_eof_interrupt, 0,
                               "imx-ic-prp-eof", priv);
        if (ret) {
                v4l2_err(&ic_priv->sd,
                         "Error registering eof irq: %d\n", ret);
                goto out_free_nfb4eof_irq;
        }

        /* start upstream */
        ret = v4l2_subdev_call(priv->src_sd, video, s_stream, 1);
        ret = (ret && ret != -ENOIOCTLCMD) ? ret : 0;
        if (ret) {
                v4l2_err(&ic_priv->sd,
                         "upstream stream on failed: %d\n", ret);
                goto out_free_eof_irq;
        }

        /* start the EOF timeout timer */
        mod_timer(&priv->eof_timeout_timer,
                  jiffies + msecs_to_jiffies(IMX_MEDIA_EOF_TIMEOUT));

        return 0;

out_free_eof_irq:
        devm_free_irq(ic_priv->ipu_dev, priv->eof_irq, priv);
out_free_nfb4eof_irq:
        devm_free_irq(ic_priv->ipu_dev, priv->nfb4eof_irq, priv);
out_unsetup:
        prp_unsetup(priv, VB2_BUF_STATE_QUEUED);
out_free_underrun:
        imx_media_free_dma_buf(ic_priv->ipu_dev, &priv->underrun_buf);
out_put_ipu:
        prp_put_ipu_resources(priv);
        return ret;
}

static void prp_stop(struct prp_priv *priv)
{
        struct imx_ic_priv *ic_priv = priv->ic_priv;
        unsigned long flags;
        int ret;

        /* mark next EOF interrupt as the last before stream off */
        spin_lock_irqsave(&priv->irqlock, flags);
        priv->last_eof = true;
        spin_unlock_irqrestore(&priv->irqlock, flags);

        /*
         * and then wait for interrupt handler to mark completion.
         */
        ret = wait_for_completion_timeout(
                &priv->last_eof_comp,
                msecs_to_jiffies(IMX_MEDIA_EOF_TIMEOUT));
        if (ret == 0)
                v4l2_warn(&ic_priv->sd, "wait last EOF timeout\n");

        /* stop upstream */
        ret = v4l2_subdev_call(priv->src_sd, video, s_stream, 0);
        if (ret && ret != -ENOIOCTLCMD)
                v4l2_warn(&ic_priv->sd,
                          "upstream stream off failed: %d\n", ret);

        devm_free_irq(ic_priv->ipu_dev, priv->eof_irq, priv);
        devm_free_irq(ic_priv->ipu_dev, priv->nfb4eof_irq, priv);

        prp_unsetup(priv, VB2_BUF_STATE_ERROR);

        imx_media_free_dma_buf(ic_priv->ipu_dev, &priv->underrun_buf);

        /* cancel the EOF timeout timer */
        timer_delete_sync(&priv->eof_timeout_timer);

        prp_put_ipu_resources(priv);
}

static struct v4l2_mbus_framefmt *
__prp_get_fmt(struct prp_priv *priv, struct v4l2_subdev_state *sd_state,
              unsigned int pad, enum v4l2_subdev_format_whence which)
{
        if (which == V4L2_SUBDEV_FORMAT_TRY)
                return v4l2_subdev_state_get_format(sd_state, pad);
        else
                return &priv->format_mbus[pad];
}

/*
 * Applies IC resizer and IDMAC alignment restrictions to output
 * rectangle given the input rectangle, and depending on given
 * rotation mode.
 *
 * The IC resizer cannot downsize more than 4:1. Note also that
 * for 90 or 270 rotation, _both_ output width and height must
 * be aligned by W_ALIGN_SRC, because the intermediate rotation
 * buffer swaps output width/height, and the final output buffer
 * does not.
 *
 * Returns true if the output rectangle was modified.
 */
static bool prp_bound_align_output(struct v4l2_mbus_framefmt *outfmt,
                                   struct v4l2_mbus_framefmt *infmt,
                                   enum ipu_rotate_mode rot_mode)
{
        u32 orig_width = outfmt->width;
        u32 orig_height = outfmt->height;

        if (ipu_rot_mode_is_irt(rot_mode))
                v4l_bound_align_image(&outfmt->width,
                                      infmt->height / 4, MAX_H_SRC,
                                      W_ALIGN_SRC,
                                      &outfmt->height,
                                      infmt->width / 4, MAX_W_SRC,
                                      W_ALIGN_SRC, S_ALIGN);
        else
                v4l_bound_align_image(&outfmt->width,
                                      infmt->width / 4, MAX_W_SRC,
                                      W_ALIGN_SRC,
                                      &outfmt->height,
                                      infmt->height / 4, MAX_H_SRC,
                                      H_ALIGN_SRC, S_ALIGN);

        return outfmt->width != orig_width || outfmt->height != orig_height;
}

/*
 * V4L2 subdev operations.
 */

static int prp_enum_mbus_code(struct v4l2_subdev *sd,
                              struct v4l2_subdev_state *sd_state,
                              struct v4l2_subdev_mbus_code_enum *code)
{
        if (code->pad >= PRPENCVF_NUM_PADS)
                return -EINVAL;

        return imx_media_enum_ipu_formats(&code->code, code->index,
                                          PIXFMT_SEL_YUV_RGB);
}

static int prp_get_fmt(struct v4l2_subdev *sd,
                       struct v4l2_subdev_state *sd_state,
                       struct v4l2_subdev_format *sdformat)
{
        struct prp_priv *priv = sd_to_priv(sd);
        struct v4l2_mbus_framefmt *fmt;
        int ret = 0;

        if (sdformat->pad >= PRPENCVF_NUM_PADS)
                return -EINVAL;

        mutex_lock(&priv->lock);

        fmt = __prp_get_fmt(priv, sd_state, sdformat->pad, sdformat->which);
        if (!fmt) {
                ret = -EINVAL;
                goto out;
        }

        sdformat->format = *fmt;
out:
        mutex_unlock(&priv->lock);
        return ret;
}

static void prp_try_fmt(struct prp_priv *priv,
                        struct v4l2_subdev_state *sd_state,
                        struct v4l2_subdev_format *sdformat,
                        const struct imx_media_pixfmt **cc)
{
        struct v4l2_mbus_framefmt *infmt;

        *cc = imx_media_find_ipu_format(sdformat->format.code,
                                        PIXFMT_SEL_YUV_RGB);
        if (!*cc) {
                u32 code;

                imx_media_enum_ipu_formats(&code, 0, PIXFMT_SEL_YUV_RGB);
                *cc = imx_media_find_ipu_format(code, PIXFMT_SEL_YUV_RGB);

                sdformat->format.code = (*cc)->codes[0];
        }

        infmt = __prp_get_fmt(priv, sd_state, PRPENCVF_SINK_PAD,
                              sdformat->which);

        if (sdformat->pad == PRPENCVF_SRC_PAD) {
                sdformat->format.field = infmt->field;

                prp_bound_align_output(&sdformat->format, infmt,
                                       priv->rot_mode);

                /* propagate colorimetry from sink */
                sdformat->format.colorspace = infmt->colorspace;
                sdformat->format.xfer_func = infmt->xfer_func;
        } else {
                v4l_bound_align_image(&sdformat->format.width,
                                      MIN_W_SINK, MAX_W_SINK, W_ALIGN_SINK,
                                      &sdformat->format.height,
                                      MIN_H_SINK, MAX_H_SINK, H_ALIGN_SINK,
                                      S_ALIGN);

                if (sdformat->format.field == V4L2_FIELD_ANY)
                        sdformat->format.field = V4L2_FIELD_NONE;
        }

        imx_media_try_colorimetry(&sdformat->format, true);
}

static int prp_set_fmt(struct v4l2_subdev *sd,
                       struct v4l2_subdev_state *sd_state,
                       struct v4l2_subdev_format *sdformat)
{
        struct prp_priv *priv = sd_to_priv(sd);
        const struct imx_media_pixfmt *cc;
        struct v4l2_mbus_framefmt *fmt;
        int ret = 0;

        if (sdformat->pad >= PRPENCVF_NUM_PADS)
                return -EINVAL;

        mutex_lock(&priv->lock);

        if (priv->stream_count > 0) {
                ret = -EBUSY;
                goto out;
        }

        prp_try_fmt(priv, sd_state, sdformat, &cc);

        fmt = __prp_get_fmt(priv, sd_state, sdformat->pad, sdformat->which);
        *fmt = sdformat->format;

        /* propagate a default format to source pad */
        if (sdformat->pad == PRPENCVF_SINK_PAD) {
                const struct imx_media_pixfmt *outcc;
                struct v4l2_mbus_framefmt *outfmt;
                struct v4l2_subdev_format format;

                format.pad = PRPENCVF_SRC_PAD;
                format.which = sdformat->which;
                format.format = sdformat->format;
                prp_try_fmt(priv, sd_state, &format, &outcc);

                outfmt = __prp_get_fmt(priv, sd_state, PRPENCVF_SRC_PAD,
                                       sdformat->which);
                *outfmt = format.format;
                if (sdformat->which == V4L2_SUBDEV_FORMAT_ACTIVE)
                        priv->cc[PRPENCVF_SRC_PAD] = outcc;
        }

        if (sdformat->which == V4L2_SUBDEV_FORMAT_ACTIVE)
                priv->cc[sdformat->pad] = cc;

out:
        mutex_unlock(&priv->lock);
        return ret;
}

static int prp_enum_frame_size(struct v4l2_subdev *sd,
                               struct v4l2_subdev_state *sd_state,
                               struct v4l2_subdev_frame_size_enum *fse)
{
        struct prp_priv *priv = sd_to_priv(sd);
        struct v4l2_subdev_format format = {};
        const struct imx_media_pixfmt *cc;
        int ret = 0;

        if (fse->pad >= PRPENCVF_NUM_PADS || fse->index != 0)
                return -EINVAL;

        mutex_lock(&priv->lock);

        format.pad = fse->pad;
        format.which = fse->which;
        format.format.code = fse->code;
        format.format.width = 1;
        format.format.height = 1;
        prp_try_fmt(priv, sd_state, &format, &cc);
        fse->min_width = format.format.width;
        fse->min_height = format.format.height;

        if (format.format.code != fse->code) {
                ret = -EINVAL;
                goto out;
        }

        format.format.code = fse->code;
        format.format.width = -1;
        format.format.height = -1;
        prp_try_fmt(priv, sd_state, &format, &cc);
        fse->max_width = format.format.width;
        fse->max_height = format.format.height;
out:
        mutex_unlock(&priv->lock);
        return ret;
}

static int prp_link_setup(struct media_entity *entity,
                          const struct media_pad *local,
                          const struct media_pad *remote, u32 flags)
{
        struct v4l2_subdev *sd = media_entity_to_v4l2_subdev(entity);
        struct imx_ic_priv *ic_priv = v4l2_get_subdevdata(sd);
        struct prp_priv *priv = ic_priv->task_priv;
        struct v4l2_subdev *remote_sd;
        int ret = 0;

        dev_dbg(ic_priv->ipu_dev, "%s: link setup %s -> %s",
                ic_priv->sd.name, remote->entity->name, local->entity->name);

        mutex_lock(&priv->lock);

        if (local->flags & MEDIA_PAD_FL_SINK) {
                if (!is_media_entity_v4l2_subdev(remote->entity)) {
                        ret = -EINVAL;
                        goto out;
                }

                remote_sd = media_entity_to_v4l2_subdev(remote->entity);

                if (flags & MEDIA_LNK_FL_ENABLED) {
                        if (priv->src_sd) {
                                ret = -EBUSY;
                                goto out;
                        }
                        priv->src_sd = remote_sd;
                } else {
                        priv->src_sd = NULL;
                }

                goto out;
        }

        /* this is the source pad */

        /* the remote must be the device node */
        if (!is_media_entity_v4l2_video_device(remote->entity)) {
                ret = -EINVAL;
                goto out;
        }

        if (flags & MEDIA_LNK_FL_ENABLED) {
                if (priv->sink) {
                        ret = -EBUSY;
                        goto out;
                }
        } else {
                priv->sink = NULL;
                goto out;
        }

        priv->sink = remote->entity;
out:
        mutex_unlock(&priv->lock);
        return ret;
}

static int prp_s_ctrl(struct v4l2_ctrl *ctrl)
{
        struct prp_priv *priv = container_of(ctrl->handler,
                                               struct prp_priv, ctrl_hdlr);
        struct imx_ic_priv *ic_priv = priv->ic_priv;
        enum ipu_rotate_mode rot_mode;
        int rotation, ret = 0;
        bool hflip, vflip;

        mutex_lock(&priv->lock);

        rotation = priv->rotation;
        hflip = priv->hflip;
        vflip = priv->vflip;

        switch (ctrl->id) {
        case V4L2_CID_HFLIP:
                hflip = (ctrl->val == 1);
                break;
        case V4L2_CID_VFLIP:
                vflip = (ctrl->val == 1);
                break;
        case V4L2_CID_ROTATE:
                rotation = ctrl->val;
                break;
        default:
                v4l2_err(&ic_priv->sd, "Invalid control\n");
                ret = -EINVAL;
                goto out;
        }

        ret = ipu_degrees_to_rot_mode(&rot_mode, rotation, hflip, vflip);
        if (ret)
                goto out;

        if (rot_mode != priv->rot_mode) {
                struct v4l2_mbus_framefmt outfmt, infmt;

                /* can't change rotation mid-streaming */
                if (priv->stream_count > 0) {
                        ret = -EBUSY;
                        goto out;
                }

                outfmt = priv->format_mbus[PRPENCVF_SRC_PAD];
                infmt = priv->format_mbus[PRPENCVF_SINK_PAD];

                if (prp_bound_align_output(&outfmt, &infmt, rot_mode)) {
                        ret = -EINVAL;
                        goto out;
                }

                priv->rot_mode = rot_mode;
                priv->rotation = rotation;
                priv->hflip = hflip;
                priv->vflip = vflip;
        }

out:
        mutex_unlock(&priv->lock);
        return ret;
}

static const struct v4l2_ctrl_ops prp_ctrl_ops = {
        .s_ctrl = prp_s_ctrl,
};

static int prp_init_controls(struct prp_priv *priv)
{
        struct imx_ic_priv *ic_priv = priv->ic_priv;
        struct v4l2_ctrl_handler *hdlr = &priv->ctrl_hdlr;
        int ret;

        v4l2_ctrl_handler_init(hdlr, 3);

        v4l2_ctrl_new_std(hdlr, &prp_ctrl_ops, V4L2_CID_HFLIP,
                          0, 1, 1, 0);
        v4l2_ctrl_new_std(hdlr, &prp_ctrl_ops, V4L2_CID_VFLIP,
                          0, 1, 1, 0);
        v4l2_ctrl_new_std(hdlr, &prp_ctrl_ops, V4L2_CID_ROTATE,
                          0, 270, 90, 0);

        ic_priv->sd.ctrl_handler = hdlr;

        if (hdlr->error) {
                ret = hdlr->error;
                goto out_free;
        }

        v4l2_ctrl_handler_setup(hdlr);
        return 0;

out_free:
        v4l2_ctrl_handler_free(hdlr);
        return ret;
}

static int prp_s_stream(struct v4l2_subdev *sd, int enable)
{
        struct imx_ic_priv *ic_priv = v4l2_get_subdevdata(sd);
        struct prp_priv *priv = ic_priv->task_priv;
        int ret = 0;

        mutex_lock(&priv->lock);

        if (!priv->src_sd || !priv->sink) {
                ret = -EPIPE;
                goto out;
        }

        /*
         * enable/disable streaming only if stream_count is
         * going from 0 to 1 / 1 to 0.
         */
        if (priv->stream_count != !enable)
                goto update_count;

        dev_dbg(ic_priv->ipu_dev, "%s: stream %s\n", sd->name,
                enable ? "ON" : "OFF");

        if (enable)
                ret = prp_start(priv);
        else
                prp_stop(priv);
        if (ret)
                goto out;

update_count:
        priv->stream_count += enable ? 1 : -1;
        if (priv->stream_count < 0)
                priv->stream_count = 0;
out:
        mutex_unlock(&priv->lock);
        return ret;
}

static int prp_get_frame_interval(struct v4l2_subdev *sd,
                                  struct v4l2_subdev_state *sd_state,
                                  struct v4l2_subdev_frame_interval *fi)
{
        struct prp_priv *priv = sd_to_priv(sd);

        /*
         * FIXME: Implement support for V4L2_SUBDEV_FORMAT_TRY, using the V4L2
         * subdev active state API.
         */
        if (fi->which != V4L2_SUBDEV_FORMAT_ACTIVE)
                return -EINVAL;

        if (fi->pad >= PRPENCVF_NUM_PADS)
                return -EINVAL;

        mutex_lock(&priv->lock);
        fi->interval = priv->frame_interval;
        mutex_unlock(&priv->lock);

        return 0;
}

static int prp_set_frame_interval(struct v4l2_subdev *sd,
                                  struct v4l2_subdev_state *sd_state,
                                  struct v4l2_subdev_frame_interval *fi)
{
        struct prp_priv *priv = sd_to_priv(sd);

        /*
         * FIXME: Implement support for V4L2_SUBDEV_FORMAT_TRY, using the V4L2
         * subdev active state API.
         */
        if (fi->which != V4L2_SUBDEV_FORMAT_ACTIVE)
                return -EINVAL;

        if (fi->pad >= PRPENCVF_NUM_PADS)
                return -EINVAL;

        mutex_lock(&priv->lock);

        /* No limits on valid frame intervals */
        if (fi->interval.numerator == 0 || fi->interval.denominator == 0)
                fi->interval = priv->frame_interval;
        else
                priv->frame_interval = fi->interval;

        mutex_unlock(&priv->lock);

        return 0;
}

static int prp_registered(struct v4l2_subdev *sd)
{
        struct prp_priv *priv = sd_to_priv(sd);
        struct imx_ic_priv *ic_priv = priv->ic_priv;
        int i, ret;
        u32 code;

        /* set a default mbus format  */
        imx_media_enum_ipu_formats(&code, 0, PIXFMT_SEL_YUV);

        for (i = 0; i < PRPENCVF_NUM_PADS; i++) {
                ret = imx_media_init_mbus_fmt(&priv->format_mbus[i],
                                              IMX_MEDIA_DEF_PIX_WIDTH,
                                              IMX_MEDIA_DEF_PIX_HEIGHT, code,
                                              V4L2_FIELD_NONE, &priv->cc[i]);
                if (ret)
                        return ret;
        }

        /* init default frame interval */
        priv->frame_interval.numerator = 1;
        priv->frame_interval.denominator = 30;

        priv->vdev = imx_media_capture_device_init(ic_priv->ipu_dev,
                                                   &ic_priv->sd,
                                                   PRPENCVF_SRC_PAD, true);
        if (IS_ERR(priv->vdev))
                return PTR_ERR(priv->vdev);

        ret = imx_media_capture_device_register(priv->vdev, 0);
        if (ret)
                goto remove_vdev;

        ret = prp_init_controls(priv);
        if (ret)
                goto unreg_vdev;

        return 0;

unreg_vdev:
        imx_media_capture_device_unregister(priv->vdev);
remove_vdev:
        imx_media_capture_device_remove(priv->vdev);
        return ret;
}

static void prp_unregistered(struct v4l2_subdev *sd)
{
        struct prp_priv *priv = sd_to_priv(sd);

        imx_media_capture_device_unregister(priv->vdev);
        imx_media_capture_device_remove(priv->vdev);

        v4l2_ctrl_handler_free(&priv->ctrl_hdlr);
}

static const struct v4l2_subdev_pad_ops prp_pad_ops = {
        .enum_mbus_code = prp_enum_mbus_code,
        .enum_frame_size = prp_enum_frame_size,
        .get_fmt = prp_get_fmt,
        .set_fmt = prp_set_fmt,
        .get_frame_interval = prp_get_frame_interval,
        .set_frame_interval = prp_set_frame_interval,
};

static const struct v4l2_subdev_video_ops prp_video_ops = {
        .s_stream = prp_s_stream,
};

static const struct media_entity_operations prp_entity_ops = {
        .link_setup = prp_link_setup,
        .link_validate = v4l2_subdev_link_validate,
};

static const struct v4l2_subdev_ops prp_subdev_ops = {
        .video = &prp_video_ops,
        .pad = &prp_pad_ops,
};

static const struct v4l2_subdev_internal_ops prp_internal_ops = {
        .init_state = imx_media_init_state,
        .registered = prp_registered,
        .unregistered = prp_unregistered,
};

static int prp_init(struct imx_ic_priv *ic_priv)
{
        struct prp_priv *priv;
        int i, ret;

        priv = devm_kzalloc(ic_priv->ipu_dev, sizeof(*priv), GFP_KERNEL);
        if (!priv)
                return -ENOMEM;

        ic_priv->task_priv = priv;
        priv->ic_priv = ic_priv;

        spin_lock_init(&priv->irqlock);
        timer_setup(&priv->eof_timeout_timer, prp_eof_timeout, 0);

        mutex_init(&priv->lock);

        for (i = 0; i < PRPENCVF_NUM_PADS; i++) {
                priv->pad[i].flags = (i == PRPENCVF_SINK_PAD) ?
                        MEDIA_PAD_FL_SINK : MEDIA_PAD_FL_SOURCE;
        }

        ret = media_entity_pads_init(&ic_priv->sd.entity, PRPENCVF_NUM_PADS,
                                     priv->pad);
        if (ret)
                mutex_destroy(&priv->lock);

        return ret;
}

static void prp_remove(struct imx_ic_priv *ic_priv)
{
        struct prp_priv *priv = ic_priv->task_priv;

        mutex_destroy(&priv->lock);
}

struct imx_ic_ops imx_ic_prpencvf_ops = {
        .subdev_ops = &prp_subdev_ops,
        .internal_ops = &prp_internal_ops,
        .entity_ops = &prp_entity_ops,
        .init = prp_init,
        .remove = prp_remove,
};