// SPDX-License-Identifier: GPL-2.0-only
/*
 * TI VPE mem2mem driver, based on the virtual v4l2-mem2mem example driver
 *
 * Copyright (c) 2013 Texas Instruments Inc.
 * David Griego, <dagriego@biglakesoftware.com>
 * Dale Farnsworth, <dale@farnsworth.org>
 * Archit Taneja, <archit@ti.com>
 *
 * Copyright (c) 2009-2010 Samsung Electronics Co., Ltd.
 * Pawel Osciak, <pawel@osciak.com>
 * Marek Szyprowski, <m.szyprowski@samsung.com>
 *
 * Based on the virtual v4l2-mem2mem example device
 */

#include <linux/delay.h>
#include <linux/dma-mapping.h>
#include <linux/err.h>
#include <linux/fs.h>
#include <linux/interrupt.h>
#include <linux/io.h>
#include <linux/ioctl.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/platform_device.h>
#include <linux/pm_runtime.h>
#include <linux/sched.h>
#include <linux/slab.h>
#include <linux/videodev2.h>
#include <linux/log2.h>
#include <linux/sizes.h>

#include <media/v4l2-common.h>
#include <media/v4l2-ctrls.h>
#include <media/v4l2-device.h>
#include <media/v4l2-event.h>
#include <media/v4l2-ioctl.h>
#include <media/v4l2-mem2mem.h>
#include <media/videobuf2-v4l2.h>
#include <media/videobuf2-dma-contig.h>

#include "vpdma.h"
#include "vpdma_priv.h"
#include "vpe_regs.h"
#include "sc.h"
#include "csc.h"

#define VPE_MODULE_NAME "vpe"

/* minimum and maximum frame sizes */
#define MIN_W           32
#define MIN_H           32
#define MAX_W           2048
#define MAX_H           1184

/* required alignments */
#define S_ALIGN         0       /* multiple of 1 */
#define H_ALIGN         1       /* multiple of 2 */

/* flags that indicate a format can be used for capture/output */
#define VPE_FMT_TYPE_CAPTURE    (1 << 0)
#define VPE_FMT_TYPE_OUTPUT     (1 << 1)

/* used as plane indices */
#define VPE_MAX_PLANES  2
#define VPE_LUMA        0
#define VPE_CHROMA      1

/* per m2m context info */
#define VPE_MAX_SRC_BUFS        3       /* need 3 src fields to de-interlace */

#define VPE_DEF_BUFS_PER_JOB    1       /* default one buffer per batch job */

/*
 * each VPE context can need up to 3 config descriptors, 7 input descriptors,
 * 3 output descriptors, and 10 control descriptors
 */
#define VPE_DESC_LIST_SIZE      (10 * VPDMA_DTD_DESC_SIZE +     \
                                        13 * VPDMA_CFD_CTD_DESC_SIZE)

#define vpe_dbg(vpedev, fmt, arg...)    \
                dev_dbg((vpedev)->v4l2_dev.dev, fmt, ##arg)
#define vpe_err(vpedev, fmt, arg...)    \
                dev_err((vpedev)->v4l2_dev.dev, fmt, ##arg)

struct vpe_us_coeffs {
        unsigned short  anchor_fid0_c0;
        unsigned short  anchor_fid0_c1;
        unsigned short  anchor_fid0_c2;
        unsigned short  anchor_fid0_c3;
        unsigned short  interp_fid0_c0;
        unsigned short  interp_fid0_c1;
        unsigned short  interp_fid0_c2;
        unsigned short  interp_fid0_c3;
        unsigned short  anchor_fid1_c0;
        unsigned short  anchor_fid1_c1;
        unsigned short  anchor_fid1_c2;
        unsigned short  anchor_fid1_c3;
        unsigned short  interp_fid1_c0;
        unsigned short  interp_fid1_c1;
        unsigned short  interp_fid1_c2;
        unsigned short  interp_fid1_c3;
};

/*
 * Default upsampler coefficients
 */
static const struct vpe_us_coeffs us_coeffs[] = {
        {
                /* Coefficients for progressive input */
                0x00C8, 0x0348, 0x0018, 0x3FD8, 0x3FB8, 0x0378, 0x00E8, 0x3FE8,
                0x00C8, 0x0348, 0x0018, 0x3FD8, 0x3FB8, 0x0378, 0x00E8, 0x3FE8,
        },
        {
                /* Coefficients for Top Field Interlaced input */
                0x0051, 0x03D5, 0x3FE3, 0x3FF7, 0x3FB5, 0x02E9, 0x018F, 0x3FD3,
                /* Coefficients for Bottom Field Interlaced input */
                0x016B, 0x0247, 0x00B1, 0x3F9D, 0x3FCF, 0x03DB, 0x005D, 0x3FF9,
        },
};

/*
 * the following registers are for configuring some of the parameters of the
 * motion and edge detection blocks inside DEI, these generally remain the same,
 * these could be passed later via userspace if some one needs to tweak these.
 */
struct vpe_dei_regs {
        unsigned long mdt_spacial_freq_thr_reg;         /* VPE_DEI_REG2 */
        unsigned long edi_config_reg;                   /* VPE_DEI_REG3 */
        unsigned long edi_lut_reg0;                     /* VPE_DEI_REG4 */
        unsigned long edi_lut_reg1;                     /* VPE_DEI_REG5 */
        unsigned long edi_lut_reg2;                     /* VPE_DEI_REG6 */
        unsigned long edi_lut_reg3;                     /* VPE_DEI_REG7 */
};

/*
 * default expert DEI register values, unlikely to be modified.
 */
static const struct vpe_dei_regs dei_regs = {
        .mdt_spacial_freq_thr_reg = 0x020C0804u,
        .edi_config_reg = 0x0118100Cu,
        .edi_lut_reg0 = 0x08040200u,
        .edi_lut_reg1 = 0x1010100Cu,
        .edi_lut_reg2 = 0x10101010u,
        .edi_lut_reg3 = 0x10101010u,
};

/*
 * The port_data structure contains per-port data.
 */
struct vpe_port_data {
        enum vpdma_channel channel;     /* VPDMA channel */
        u8      vb_index;               /* input frame f, f-1, f-2 index */
        u8      vb_part;                /* plane index for co-panar formats */
};

/*
 * Define indices into the port_data tables
 */
#define VPE_PORT_LUMA1_IN       0
#define VPE_PORT_CHROMA1_IN     1
#define VPE_PORT_LUMA2_IN       2
#define VPE_PORT_CHROMA2_IN     3
#define VPE_PORT_LUMA3_IN       4
#define VPE_PORT_CHROMA3_IN     5
#define VPE_PORT_MV_IN          6
#define VPE_PORT_MV_OUT         7
#define VPE_PORT_LUMA_OUT       8
#define VPE_PORT_CHROMA_OUT     9
#define VPE_PORT_RGB_OUT        10

static const struct vpe_port_data port_data[11] = {
        [VPE_PORT_LUMA1_IN] = {
                .channel        = VPE_CHAN_LUMA1_IN,
                .vb_index       = 0,
                .vb_part        = VPE_LUMA,
        },
        [VPE_PORT_CHROMA1_IN] = {
                .channel        = VPE_CHAN_CHROMA1_IN,
                .vb_index       = 0,
                .vb_part        = VPE_CHROMA,
        },
        [VPE_PORT_LUMA2_IN] = {
                .channel        = VPE_CHAN_LUMA2_IN,
                .vb_index       = 1,
                .vb_part        = VPE_LUMA,
        },
        [VPE_PORT_CHROMA2_IN] = {
                .channel        = VPE_CHAN_CHROMA2_IN,
                .vb_index       = 1,
                .vb_part        = VPE_CHROMA,
        },
        [VPE_PORT_LUMA3_IN] = {
                .channel        = VPE_CHAN_LUMA3_IN,
                .vb_index       = 2,
                .vb_part        = VPE_LUMA,
        },
        [VPE_PORT_CHROMA3_IN] = {
                .channel        = VPE_CHAN_CHROMA3_IN,
                .vb_index       = 2,
                .vb_part        = VPE_CHROMA,
        },
        [VPE_PORT_MV_IN] = {
                .channel        = VPE_CHAN_MV_IN,
        },
        [VPE_PORT_MV_OUT] = {
                .channel        = VPE_CHAN_MV_OUT,
        },
        [VPE_PORT_LUMA_OUT] = {
                .channel        = VPE_CHAN_LUMA_OUT,
                .vb_part        = VPE_LUMA,
        },
        [VPE_PORT_CHROMA_OUT] = {
                .channel        = VPE_CHAN_CHROMA_OUT,
                .vb_part        = VPE_CHROMA,
        },
        [VPE_PORT_RGB_OUT] = {
                .channel        = VPE_CHAN_RGB_OUT,
                .vb_part        = VPE_LUMA,
        },
};


/* driver info for each of the supported video formats */
struct vpe_fmt {
        char    *name;                  /* human-readable name */
        u32     fourcc;                 /* standard format identifier */
        u8      types;                  /* CAPTURE and/or OUTPUT */
        u8      coplanar;               /* set for unpacked Luma and Chroma */
        /* vpdma format info for each plane */
        struct vpdma_data_format const *vpdma_fmt[VPE_MAX_PLANES];
};

static struct vpe_fmt vpe_formats[] = {
        {
                .name           = "NV16 YUV 422 co-planar",
                .fourcc         = V4L2_PIX_FMT_NV16,
                .types          = VPE_FMT_TYPE_CAPTURE | VPE_FMT_TYPE_OUTPUT,
                .coplanar       = 1,
                .vpdma_fmt      = { &vpdma_yuv_fmts[VPDMA_DATA_FMT_Y444],
                                    &vpdma_yuv_fmts[VPDMA_DATA_FMT_C444],
                                  },
        },
        {
                .name           = "NV12 YUV 420 co-planar",
                .fourcc         = V4L2_PIX_FMT_NV12,
                .types          = VPE_FMT_TYPE_CAPTURE | VPE_FMT_TYPE_OUTPUT,
                .coplanar       = 1,
                .vpdma_fmt      = { &vpdma_yuv_fmts[VPDMA_DATA_FMT_Y420],
                                    &vpdma_yuv_fmts[VPDMA_DATA_FMT_C420],
                                  },
        },
        {
                .name           = "YUYV 422 packed",
                .fourcc         = V4L2_PIX_FMT_YUYV,
                .types          = VPE_FMT_TYPE_CAPTURE | VPE_FMT_TYPE_OUTPUT,
                .coplanar       = 0,
                .vpdma_fmt      = { &vpdma_yuv_fmts[VPDMA_DATA_FMT_YCB422],
                                  },
        },
        {
                .name           = "UYVY 422 packed",
                .fourcc         = V4L2_PIX_FMT_UYVY,
                .types          = VPE_FMT_TYPE_CAPTURE | VPE_FMT_TYPE_OUTPUT,
                .coplanar       = 0,
                .vpdma_fmt      = { &vpdma_yuv_fmts[VPDMA_DATA_FMT_CBY422],
                                  },
        },
        {
                .name           = "RGB888 packed",
                .fourcc         = V4L2_PIX_FMT_RGB24,
                .types          = VPE_FMT_TYPE_CAPTURE,
                .coplanar       = 0,
                .vpdma_fmt      = { &vpdma_rgb_fmts[VPDMA_DATA_FMT_RGB24],
                                  },
        },
        {
                .name           = "ARGB32",
                .fourcc         = V4L2_PIX_FMT_RGB32,
                .types          = VPE_FMT_TYPE_CAPTURE,
                .coplanar       = 0,
                .vpdma_fmt      = { &vpdma_rgb_fmts[VPDMA_DATA_FMT_ARGB32],
                                  },
        },
        {
                .name           = "BGR888 packed",
                .fourcc         = V4L2_PIX_FMT_BGR24,
                .types          = VPE_FMT_TYPE_CAPTURE,
                .coplanar       = 0,
                .vpdma_fmt      = { &vpdma_rgb_fmts[VPDMA_DATA_FMT_BGR24],
                                  },
        },
        {
                .name           = "ABGR32",
                .fourcc         = V4L2_PIX_FMT_BGR32,
                .types          = VPE_FMT_TYPE_CAPTURE,
                .coplanar       = 0,
                .vpdma_fmt      = { &vpdma_rgb_fmts[VPDMA_DATA_FMT_ABGR32],
                                  },
        },
        {
                .name           = "RGB565",
                .fourcc         = V4L2_PIX_FMT_RGB565,
                .types          = VPE_FMT_TYPE_CAPTURE,
                .coplanar       = 0,
                .vpdma_fmt      = { &vpdma_rgb_fmts[VPDMA_DATA_FMT_RGB565],
                                  },
        },
        {
                .name           = "RGB5551",
                .fourcc         = V4L2_PIX_FMT_RGB555,
                .types          = VPE_FMT_TYPE_CAPTURE,
                .coplanar       = 0,
                .vpdma_fmt      = { &vpdma_rgb_fmts[VPDMA_DATA_FMT_RGBA16_5551],
                                  },
        },
};

/*
 * per-queue, driver-specific private data.
 * there is one source queue and one destination queue for each m2m context.
 */
struct vpe_q_data {
        unsigned int            width;                          /* frame width */
        unsigned int            height;                         /* frame height */
        unsigned int            nplanes;                        /* Current number of planes */
        unsigned int            bytesperline[VPE_MAX_PLANES];   /* bytes per line in memory */
        enum v4l2_colorspace    colorspace;
        enum v4l2_field         field;                          /* supported field value */
        unsigned int            flags;
        unsigned int            sizeimage[VPE_MAX_PLANES];      /* image size in memory */
        struct v4l2_rect        c_rect;                         /* crop/compose rectangle */
        struct vpe_fmt          *fmt;                           /* format info */
};

/* vpe_q_data flag bits */
#define Q_DATA_FRAME_1D                 BIT(0)
#define Q_DATA_MODE_TILED               BIT(1)
#define Q_DATA_INTERLACED_ALTERNATE     BIT(2)
#define Q_DATA_INTERLACED_SEQ_TB        BIT(3)

#define Q_IS_INTERLACED         (Q_DATA_INTERLACED_ALTERNATE | \
                                Q_DATA_INTERLACED_SEQ_TB)

enum {
        Q_DATA_SRC = 0,
        Q_DATA_DST = 1,
};

/* find our format description corresponding to the passed v4l2_format */
static struct vpe_fmt *find_format(struct v4l2_format *f)
{
        struct vpe_fmt *fmt;
        unsigned int k;

        for (k = 0; k < ARRAY_SIZE(vpe_formats); k++) {
                fmt = &vpe_formats[k];
                if (fmt->fourcc == f->fmt.pix.pixelformat)
                        return fmt;
        }

        return NULL;
}

/*
 * there is one vpe_dev structure in the driver, it is shared by
 * all instances.
 */
struct vpe_dev {
        struct v4l2_device      v4l2_dev;
        struct video_device     vfd;
        struct v4l2_m2m_dev     *m2m_dev;

        atomic_t                num_instances;  /* count of driver instances */
        dma_addr_t              loaded_mmrs;    /* shadow mmrs in device */
        struct mutex            dev_mutex;
        spinlock_t              lock;

        int                     irq;
        void __iomem            *base;
        struct resource         *res;

        struct vpdma_data       vpdma_data;
        struct vpdma_data       *vpdma;         /* vpdma data handle */
        struct sc_data          *sc;            /* scaler data handle */
        struct csc_data         *csc;           /* csc data handle */
};

/*
 * There is one vpe_ctx structure for each m2m context.
 */
struct vpe_ctx {
        struct v4l2_fh          fh;
        struct vpe_dev          *dev;
        struct v4l2_ctrl_handler hdl;

        unsigned int            field;                  /* current field */
        unsigned int            sequence;               /* current frame/field seq */
        unsigned int            aborting;               /* abort after next irq */

        unsigned int            bufs_per_job;           /* input buffers per batch */
        unsigned int            bufs_completed;         /* bufs done in this batch */

        struct vpe_q_data       q_data[2];              /* src & dst queue data */
        struct vb2_v4l2_buffer  *src_vbs[VPE_MAX_SRC_BUFS];
        struct vb2_v4l2_buffer  *dst_vb;

        dma_addr_t              mv_buf_dma[2];          /* dma addrs of motion vector in/out bufs */
        void                    *mv_buf[2];             /* virtual addrs of motion vector bufs */
        size_t                  mv_buf_size;            /* current motion vector buffer size */
        struct vpdma_buf        mmr_adb;                /* shadow reg addr/data block */
        struct vpdma_buf        sc_coeff_h;             /* h coeff buffer */
        struct vpdma_buf        sc_coeff_v;             /* v coeff buffer */
        struct vpdma_desc_list  desc_list;              /* DMA descriptor list */

        bool                    deinterlacing;          /* using de-interlacer */
        bool                    load_mmrs;              /* have new shadow reg values */

        unsigned int            src_mv_buf_selector;
};


/*
 * M2M devices get 2 queues.
 * Return the queue given the type.
 */
static struct vpe_q_data *get_q_data(struct vpe_ctx *ctx,
                                     enum v4l2_buf_type type)
{
        switch (type) {
        case V4L2_BUF_TYPE_VIDEO_OUTPUT_MPLANE:
        case V4L2_BUF_TYPE_VIDEO_OUTPUT:
                return &ctx->q_data[Q_DATA_SRC];
        case V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE:
        case V4L2_BUF_TYPE_VIDEO_CAPTURE:
                return &ctx->q_data[Q_DATA_DST];
        default:
                return NULL;
        }
        return NULL;
}

static u32 read_reg(struct vpe_dev *dev, int offset)
{
        return ioread32(dev->base + offset);
}

static void write_reg(struct vpe_dev *dev, int offset, u32 value)
{
        iowrite32(value, dev->base + offset);
}

/* register field read/write helpers */
static int get_field(u32 value, u32 mask, int shift)
{
        return (value & (mask << shift)) >> shift;
}

static int read_field_reg(struct vpe_dev *dev, int offset, u32 mask, int shift)
{
        return get_field(read_reg(dev, offset), mask, shift);
}

static void write_field(u32 *valp, u32 field, u32 mask, int shift)
{
        u32 val = *valp;

        val &= ~(mask << shift);
        val |= (field & mask) << shift;
        *valp = val;
}

static void write_field_reg(struct vpe_dev *dev, int offset, u32 field,
                u32 mask, int shift)
{
        u32 val = read_reg(dev, offset);

        write_field(&val, field, mask, shift);

        write_reg(dev, offset, val);
}

/*
 * DMA address/data block for the shadow registers
 */
struct vpe_mmr_adb {
        struct vpdma_adb_hdr    out_fmt_hdr;
        u32                     out_fmt_reg[1];
        u32                     out_fmt_pad[3];
        struct vpdma_adb_hdr    us1_hdr;
        u32                     us1_regs[8];
        struct vpdma_adb_hdr    us2_hdr;
        u32                     us2_regs[8];
        struct vpdma_adb_hdr    us3_hdr;
        u32                     us3_regs[8];
        struct vpdma_adb_hdr    dei_hdr;
        u32                     dei_regs[8];
        struct vpdma_adb_hdr    sc_hdr0;
        u32                     sc_regs0[7];
        u32                     sc_pad0[1];
        struct vpdma_adb_hdr    sc_hdr8;
        u32                     sc_regs8[6];
        u32                     sc_pad8[2];
        struct vpdma_adb_hdr    sc_hdr17;
        u32                     sc_regs17[9];
        u32                     sc_pad17[3];
        struct vpdma_adb_hdr    csc_hdr;
        u32                     csc_regs[6];
        u32                     csc_pad[2];
};

#define GET_OFFSET_TOP(ctx, obj, reg)   \
        ((obj)->res->start - ctx->dev->res->start + reg)

#define VPE_SET_MMR_ADB_HDR(ctx, hdr, regs, offset_a)   \
        VPDMA_SET_MMR_ADB_HDR(ctx->mmr_adb, vpe_mmr_adb, hdr, regs, offset_a)
/*
 * Set the headers for all of the address/data block structures.
 */
static void init_adb_hdrs(struct vpe_ctx *ctx)
{
        VPE_SET_MMR_ADB_HDR(ctx, out_fmt_hdr, out_fmt_reg, VPE_CLK_FORMAT_SELECT);
        VPE_SET_MMR_ADB_HDR(ctx, us1_hdr, us1_regs, VPE_US1_R0);
        VPE_SET_MMR_ADB_HDR(ctx, us2_hdr, us2_regs, VPE_US2_R0);
        VPE_SET_MMR_ADB_HDR(ctx, us3_hdr, us3_regs, VPE_US3_R0);
        VPE_SET_MMR_ADB_HDR(ctx, dei_hdr, dei_regs, VPE_DEI_FRAME_SIZE);
        VPE_SET_MMR_ADB_HDR(ctx, sc_hdr0, sc_regs0,
                GET_OFFSET_TOP(ctx, ctx->dev->sc, CFG_SC0));
        VPE_SET_MMR_ADB_HDR(ctx, sc_hdr8, sc_regs8,
                GET_OFFSET_TOP(ctx, ctx->dev->sc, CFG_SC8));
        VPE_SET_MMR_ADB_HDR(ctx, sc_hdr17, sc_regs17,
                GET_OFFSET_TOP(ctx, ctx->dev->sc, CFG_SC17));
        VPE_SET_MMR_ADB_HDR(ctx, csc_hdr, csc_regs,
                GET_OFFSET_TOP(ctx, ctx->dev->csc, CSC_CSC00));
};

/*
 * Allocate or re-allocate the motion vector DMA buffers
 * There are two buffers, one for input and one for output.
 * However, the roles are reversed after each field is processed.
 * In other words, after each field is processed, the previous
 * output (dst) MV buffer becomes the new input (src) MV buffer.
 */
static int realloc_mv_buffers(struct vpe_ctx *ctx, size_t size)
{
        struct device *dev = ctx->dev->v4l2_dev.dev;

        if (ctx->mv_buf_size == size)
                return 0;

        if (ctx->mv_buf[0])
                dma_free_coherent(dev, ctx->mv_buf_size, ctx->mv_buf[0],
                        ctx->mv_buf_dma[0]);

        if (ctx->mv_buf[1])
                dma_free_coherent(dev, ctx->mv_buf_size, ctx->mv_buf[1],
                        ctx->mv_buf_dma[1]);

        if (size == 0)
                return 0;

        ctx->mv_buf[0] = dma_alloc_coherent(dev, size, &ctx->mv_buf_dma[0],
                                GFP_KERNEL);
        if (!ctx->mv_buf[0]) {
                vpe_err(ctx->dev, "failed to allocate motion vector buffer\n");
                return -ENOMEM;
        }

        ctx->mv_buf[1] = dma_alloc_coherent(dev, size, &ctx->mv_buf_dma[1],
                                GFP_KERNEL);
        if (!ctx->mv_buf[1]) {
                vpe_err(ctx->dev, "failed to allocate motion vector buffer\n");
                dma_free_coherent(dev, size, ctx->mv_buf[0],
                        ctx->mv_buf_dma[0]);

                return -ENOMEM;
        }

        ctx->mv_buf_size = size;
        ctx->src_mv_buf_selector = 0;

        return 0;
}

static void free_mv_buffers(struct vpe_ctx *ctx)
{
        realloc_mv_buffers(ctx, 0);
}

/*
 * While de-interlacing, we keep the two most recent input buffers
 * around.  This function frees those two buffers when we have
 * finished processing the current stream.
 */
static void free_vbs(struct vpe_ctx *ctx)
{
        struct vpe_dev *dev = ctx->dev;
        unsigned long flags;

        if (ctx->src_vbs[2] == NULL)
                return;

        spin_lock_irqsave(&dev->lock, flags);
        if (ctx->src_vbs[2]) {
                v4l2_m2m_buf_done(ctx->src_vbs[2], VB2_BUF_STATE_DONE);
                if (ctx->src_vbs[1] && (ctx->src_vbs[1] != ctx->src_vbs[2]))
                        v4l2_m2m_buf_done(ctx->src_vbs[1], VB2_BUF_STATE_DONE);
                ctx->src_vbs[2] = NULL;
                ctx->src_vbs[1] = NULL;
        }
        spin_unlock_irqrestore(&dev->lock, flags);
}

/*
 * Enable or disable the VPE clocks
 */
static void vpe_set_clock_enable(struct vpe_dev *dev, bool on)
{
        u32 val = 0;

        if (on)
                val = VPE_DATA_PATH_CLK_ENABLE | VPE_VPEDMA_CLK_ENABLE;
        write_reg(dev, VPE_CLK_ENABLE, val);
}

static void vpe_top_reset(struct vpe_dev *dev)
{

        write_field_reg(dev, VPE_CLK_RESET, 1, VPE_DATA_PATH_CLK_RESET_MASK,
                VPE_DATA_PATH_CLK_RESET_SHIFT);

        usleep_range(100, 150);

        write_field_reg(dev, VPE_CLK_RESET, 0, VPE_DATA_PATH_CLK_RESET_MASK,
                VPE_DATA_PATH_CLK_RESET_SHIFT);
}

static void vpe_top_vpdma_reset(struct vpe_dev *dev)
{
        write_field_reg(dev, VPE_CLK_RESET, 1, VPE_VPDMA_CLK_RESET_MASK,
                VPE_VPDMA_CLK_RESET_SHIFT);

        usleep_range(100, 150);

        write_field_reg(dev, VPE_CLK_RESET, 0, VPE_VPDMA_CLK_RESET_MASK,
                VPE_VPDMA_CLK_RESET_SHIFT);
}

/*
 * Load the correct of upsampler coefficients into the shadow MMRs
 */
static void set_us_coefficients(struct vpe_ctx *ctx)
{
        struct vpe_mmr_adb *mmr_adb = ctx->mmr_adb.addr;
        struct vpe_q_data *s_q_data = &ctx->q_data[Q_DATA_SRC];
        u32 *us1_reg = &mmr_adb->us1_regs[0];
        u32 *us2_reg = &mmr_adb->us2_regs[0];
        u32 *us3_reg = &mmr_adb->us3_regs[0];
        const unsigned short *cp, *end_cp;

        cp = &us_coeffs[0].anchor_fid0_c0;

        if (s_q_data->flags & Q_IS_INTERLACED)          /* interlaced */
                cp += sizeof(us_coeffs[0]) / sizeof(*cp);

        end_cp = cp + sizeof(us_coeffs[0]) / sizeof(*cp);

        while (cp < end_cp) {
                write_field(us1_reg, *cp++, VPE_US_C0_MASK, VPE_US_C0_SHIFT);
                write_field(us1_reg, *cp++, VPE_US_C1_MASK, VPE_US_C1_SHIFT);
                *us2_reg++ = *us1_reg;
                *us3_reg++ = *us1_reg++;
        }
        ctx->load_mmrs = true;
}

/*
 * Set the upsampler config mode and the VPDMA line mode in the shadow MMRs.
 */
static void set_cfg_modes(struct vpe_ctx *ctx)
{
        struct vpe_fmt *fmt = ctx->q_data[Q_DATA_SRC].fmt;
        struct vpe_mmr_adb *mmr_adb = ctx->mmr_adb.addr;
        u32 *us1_reg0 = &mmr_adb->us1_regs[0];
        u32 *us2_reg0 = &mmr_adb->us2_regs[0];
        u32 *us3_reg0 = &mmr_adb->us3_regs[0];
        int cfg_mode = 1;

        /*
         * Cfg Mode 0: YUV420 source, enable upsampler, DEI is de-interlacing.
         * Cfg Mode 1: YUV422 source, disable upsampler, DEI is de-interlacing.
         */

        if (fmt->fourcc == V4L2_PIX_FMT_NV12)
                cfg_mode = 0;

        write_field(us1_reg0, cfg_mode, VPE_US_MODE_MASK, VPE_US_MODE_SHIFT);
        write_field(us2_reg0, cfg_mode, VPE_US_MODE_MASK, VPE_US_MODE_SHIFT);
        write_field(us3_reg0, cfg_mode, VPE_US_MODE_MASK, VPE_US_MODE_SHIFT);

        ctx->load_mmrs = true;
}

static void set_line_modes(struct vpe_ctx *ctx)
{
        struct vpe_fmt *fmt = ctx->q_data[Q_DATA_SRC].fmt;
        int line_mode = 1;

        if (fmt->fourcc == V4L2_PIX_FMT_NV12)
                line_mode = 0;          /* double lines to line buffer */

        /* regs for now */
        vpdma_set_line_mode(ctx->dev->vpdma, line_mode, VPE_CHAN_CHROMA1_IN);
        vpdma_set_line_mode(ctx->dev->vpdma, line_mode, VPE_CHAN_CHROMA2_IN);
        vpdma_set_line_mode(ctx->dev->vpdma, line_mode, VPE_CHAN_CHROMA3_IN);

        /* frame start for input luma */
        vpdma_set_frame_start_event(ctx->dev->vpdma, VPDMA_FSEVENT_CHANNEL_ACTIVE,
                VPE_CHAN_LUMA1_IN);
        vpdma_set_frame_start_event(ctx->dev->vpdma, VPDMA_FSEVENT_CHANNEL_ACTIVE,
                VPE_CHAN_LUMA2_IN);
        vpdma_set_frame_start_event(ctx->dev->vpdma, VPDMA_FSEVENT_CHANNEL_ACTIVE,
                VPE_CHAN_LUMA3_IN);

        /* frame start for input chroma */
        vpdma_set_frame_start_event(ctx->dev->vpdma, VPDMA_FSEVENT_CHANNEL_ACTIVE,
                VPE_CHAN_CHROMA1_IN);
        vpdma_set_frame_start_event(ctx->dev->vpdma, VPDMA_FSEVENT_CHANNEL_ACTIVE,
                VPE_CHAN_CHROMA2_IN);
        vpdma_set_frame_start_event(ctx->dev->vpdma, VPDMA_FSEVENT_CHANNEL_ACTIVE,
                VPE_CHAN_CHROMA3_IN);

        /* frame start for MV in client */
        vpdma_set_frame_start_event(ctx->dev->vpdma, VPDMA_FSEVENT_CHANNEL_ACTIVE,
                VPE_CHAN_MV_IN);
}

/*
 * Set the shadow registers that are modified when the source
 * format changes.
 */
static void set_src_registers(struct vpe_ctx *ctx)
{
        set_us_coefficients(ctx);
}

/*
 * Set the shadow registers that are modified when the destination
 * format changes.
 */
static void set_dst_registers(struct vpe_ctx *ctx)
{
        struct vpe_mmr_adb *mmr_adb = ctx->mmr_adb.addr;
        enum v4l2_colorspace clrspc = ctx->q_data[Q_DATA_DST].colorspace;
        struct vpe_fmt *fmt = ctx->q_data[Q_DATA_DST].fmt;
        u32 val = 0;

        if (clrspc == V4L2_COLORSPACE_SRGB) {
                val |= VPE_RGB_OUT_SELECT;
                vpdma_set_bg_color(ctx->dev->vpdma,
                        (struct vpdma_data_format *)fmt->vpdma_fmt[0], 0xff);
        } else if (fmt->fourcc == V4L2_PIX_FMT_NV16)
                val |= VPE_COLOR_SEPARATE_422;

        /*
         * the source of CHR_DS and CSC is always the scaler, irrespective of
         * whether it's used or not
         */
        val |= VPE_DS_SRC_DEI_SCALER | VPE_CSC_SRC_DEI_SCALER;

        if (fmt->fourcc != V4L2_PIX_FMT_NV12)
                val |= VPE_DS_BYPASS;

        mmr_adb->out_fmt_reg[0] = val;

        ctx->load_mmrs = true;
}

/*
 * Set the de-interlacer shadow register values
 */
static void set_dei_regs(struct vpe_ctx *ctx)
{
        struct vpe_mmr_adb *mmr_adb = ctx->mmr_adb.addr;
        struct vpe_q_data *s_q_data = &ctx->q_data[Q_DATA_SRC];
        unsigned int src_h = s_q_data->c_rect.height;
        unsigned int src_w = s_q_data->c_rect.width;
        u32 *dei_mmr0 = &mmr_adb->dei_regs[0];
        bool deinterlace = true;
        u32 val = 0;

        /*
         * according to TRM, we should set DEI in progressive bypass mode when
         * the input content is progressive, however, DEI is bypassed correctly
         * for both progressive and interlace content in interlace bypass mode.
         * It has been recommended not to use progressive bypass mode.
         */
        if (!(s_q_data->flags & Q_IS_INTERLACED) || !ctx->deinterlacing) {
                deinterlace = false;
                val = VPE_DEI_INTERLACE_BYPASS;
        }

        src_h = deinterlace ? src_h * 2 : src_h;

        val |= (src_h << VPE_DEI_HEIGHT_SHIFT) |
                (src_w << VPE_DEI_WIDTH_SHIFT) |
                VPE_DEI_FIELD_FLUSH;

        *dei_mmr0 = val;

        ctx->load_mmrs = true;
}

static void set_dei_shadow_registers(struct vpe_ctx *ctx)
{
        struct vpe_mmr_adb *mmr_adb = ctx->mmr_adb.addr;
        u32 *dei_mmr = &mmr_adb->dei_regs[0];
        const struct vpe_dei_regs *cur = &dei_regs;

        dei_mmr[2]  = cur->mdt_spacial_freq_thr_reg;
        dei_mmr[3]  = cur->edi_config_reg;
        dei_mmr[4]  = cur->edi_lut_reg0;
        dei_mmr[5]  = cur->edi_lut_reg1;
        dei_mmr[6]  = cur->edi_lut_reg2;
        dei_mmr[7]  = cur->edi_lut_reg3;

        ctx->load_mmrs = true;
}

static void config_edi_input_mode(struct vpe_ctx *ctx, int mode)
{
        struct vpe_mmr_adb *mmr_adb = ctx->mmr_adb.addr;
        u32 *edi_config_reg = &mmr_adb->dei_regs[3];

        if (mode & 0x2)
                write_field(edi_config_reg, 1, 1, 2);   /* EDI_ENABLE_3D */

        if (mode & 0x3)
                write_field(edi_config_reg, 1, 1, 3);   /* EDI_CHROMA_3D  */

        write_field(edi_config_reg, mode, VPE_EDI_INP_MODE_MASK,
                VPE_EDI_INP_MODE_SHIFT);

        ctx->load_mmrs = true;
}

/*
 * Set the shadow registers whose values are modified when either the
 * source or destination format is changed.
 */
static int set_srcdst_params(struct vpe_ctx *ctx)
{
        struct vpe_q_data *s_q_data =  &ctx->q_data[Q_DATA_SRC];
        struct vpe_q_data *d_q_data =  &ctx->q_data[Q_DATA_DST];
        struct vpe_mmr_adb *mmr_adb = ctx->mmr_adb.addr;
        unsigned int src_w = s_q_data->c_rect.width;
        unsigned int src_h = s_q_data->c_rect.height;
        unsigned int dst_w = d_q_data->c_rect.width;
        unsigned int dst_h = d_q_data->c_rect.height;
        size_t mv_buf_size;
        int ret;

        ctx->sequence = 0;
        ctx->field = V4L2_FIELD_TOP;

        if ((s_q_data->flags & Q_IS_INTERLACED) &&
                        !(d_q_data->flags & Q_IS_INTERLACED)) {
                int bytes_per_line;
                const struct vpdma_data_format *mv =
                        &vpdma_misc_fmts[VPDMA_DATA_FMT_MV];

                /*
                 * we make sure that the source image has a 16 byte aligned
                 * stride, we need to do the same for the motion vector buffer
                 * by aligning it's stride to the next 16 byte boundary. this
                 * extra space will not be used by the de-interlacer, but will
                 * ensure that vpdma operates correctly
                 */
                bytes_per_line = ALIGN((s_q_data->width * mv->depth) >> 3,
                                        VPDMA_STRIDE_ALIGN);
                mv_buf_size = bytes_per_line * s_q_data->height;

                ctx->deinterlacing = true;
                src_h <<= 1;
        } else {
                ctx->deinterlacing = false;
                mv_buf_size = 0;
        }

        free_vbs(ctx);
        ctx->src_vbs[2] = ctx->src_vbs[1] = ctx->src_vbs[0] = NULL;

        ret = realloc_mv_buffers(ctx, mv_buf_size);
        if (ret)
                return ret;

        set_cfg_modes(ctx);
        set_dei_regs(ctx);

        csc_set_coeff(ctx->dev->csc, &mmr_adb->csc_regs[0],
                s_q_data->colorspace, d_q_data->colorspace);

        sc_set_hs_coeffs(ctx->dev->sc, ctx->sc_coeff_h.addr, src_w, dst_w);
        sc_set_vs_coeffs(ctx->dev->sc, ctx->sc_coeff_v.addr, src_h, dst_h);

        sc_config_scaler(ctx->dev->sc, &mmr_adb->sc_regs0[0],
                &mmr_adb->sc_regs8[0], &mmr_adb->sc_regs17[0],
                src_w, src_h, dst_w, dst_h);

        return 0;
}

/*
 * Return the vpe_ctx structure for a given struct file
 */
static struct vpe_ctx *file2ctx(struct file *file)
{
        return container_of(file->private_data, struct vpe_ctx, fh);
}

/*
 * mem2mem callbacks
 */

/*
 * job_ready() - check whether an instance is ready to be scheduled to run
 */
static int job_ready(void *priv)
{
        struct vpe_ctx *ctx = priv;

        /*
         * This check is needed as this might be called directly from driver
         * When called by m2m framework, this will always satisfy, but when
         * called from vpe_irq, this might fail. (src stream with zero buffers)
         */
        if (v4l2_m2m_num_src_bufs_ready(ctx->fh.m2m_ctx) <= 0 ||
                v4l2_m2m_num_dst_bufs_ready(ctx->fh.m2m_ctx) <= 0)
                return 0;

        return 1;
}

static void job_abort(void *priv)
{
        struct vpe_ctx *ctx = priv;

        /* Will cancel the transaction in the next interrupt handler */
        ctx->aborting = 1;
}

static void vpe_dump_regs(struct vpe_dev *dev)
{
#define DUMPREG(r) vpe_dbg(dev, "%-35s %08x\n", #r, read_reg(dev, VPE_##r))

        vpe_dbg(dev, "VPE Registers:\n");

        DUMPREG(PID);
        DUMPREG(SYSCONFIG);
        DUMPREG(INT0_STATUS0_RAW);
        DUMPREG(INT0_STATUS0);
        DUMPREG(INT0_ENABLE0);
        DUMPREG(INT0_STATUS1_RAW);
        DUMPREG(INT0_STATUS1);
        DUMPREG(INT0_ENABLE1);
        DUMPREG(CLK_ENABLE);
        DUMPREG(CLK_RESET);
        DUMPREG(CLK_FORMAT_SELECT);
        DUMPREG(CLK_RANGE_MAP);
        DUMPREG(US1_R0);
        DUMPREG(US1_R1);
        DUMPREG(US1_R2);
        DUMPREG(US1_R3);
        DUMPREG(US1_R4);
        DUMPREG(US1_R5);
        DUMPREG(US1_R6);
        DUMPREG(US1_R7);
        DUMPREG(US2_R0);
        DUMPREG(US2_R1);
        DUMPREG(US2_R2);
        DUMPREG(US2_R3);
        DUMPREG(US2_R4);
        DUMPREG(US2_R5);
        DUMPREG(US2_R6);
        DUMPREG(US2_R7);
        DUMPREG(US3_R0);
        DUMPREG(US3_R1);
        DUMPREG(US3_R2);
        DUMPREG(US3_R3);
        DUMPREG(US3_R4);
        DUMPREG(US3_R5);
        DUMPREG(US3_R6);
        DUMPREG(US3_R7);
        DUMPREG(DEI_FRAME_SIZE);
        DUMPREG(MDT_BYPASS);
        DUMPREG(MDT_SF_THRESHOLD);
        DUMPREG(EDI_CONFIG);
        DUMPREG(DEI_EDI_LUT_R0);
        DUMPREG(DEI_EDI_LUT_R1);

        DUMPREG(DEI_EDI_LUT_R2);
        DUMPREG(DEI_EDI_LUT_R3);
        DUMPREG(DEI_FMD_WINDOW_R0);
        DUMPREG(DEI_FMD_WINDOW_R1);
        DUMPREG(DEI_FMD_CONTROL_R0);
        DUMPREG(DEI_FMD_CONTROL_R1);
        DUMPREG(DEI_FMD_STATUS_R0);
        DUMPREG(DEI_FMD_STATUS_R1);
        DUMPREG(DEI_FMD_STATUS_R2);
#undef DUMPREG

        sc_dump_regs(dev->sc);
        csc_dump_regs(dev->csc);
}

static void add_out_dtd(struct vpe_ctx *ctx, int port)
{
        struct vpe_q_data *q_data = &ctx->q_data[Q_DATA_DST];
        const struct vpe_port_data *p_data = &port_data[port];
        struct vb2_buffer *vb = &ctx->dst_vb->vb2_buf;
        struct vpe_fmt *fmt = q_data->fmt;
        const struct vpdma_data_format *vpdma_fmt;
        int mv_buf_selector = !ctx->src_mv_buf_selector;
        dma_addr_t dma_addr;
        u32 flags = 0;
        u32 offset = 0;

        if (port == VPE_PORT_MV_OUT) {
                vpdma_fmt = &vpdma_misc_fmts[VPDMA_DATA_FMT_MV];
                dma_addr = ctx->mv_buf_dma[mv_buf_selector];
                q_data = &ctx->q_data[Q_DATA_SRC];
        } else {
                /* to incorporate interleaved formats */
                int plane = fmt->coplanar ? p_data->vb_part : 0;

                vpdma_fmt = fmt->vpdma_fmt[plane];
                /*
                 * If we are using a single plane buffer and
                 * we need to set a separate vpdma chroma channel.
                 */
                if (q_data->nplanes == 1 && plane) {
                        dma_addr = vb2_dma_contig_plane_dma_addr(vb, 0);
                        /* Compute required offset */
                        offset = q_data->bytesperline[0] * q_data->height;
                } else {
                        dma_addr = vb2_dma_contig_plane_dma_addr(vb, plane);
                        /* Use address as is, no offset */
                        offset = 0;
                }
                if (!dma_addr) {
                        vpe_err(ctx->dev,
                                "acquiring output buffer(%d) dma_addr failed\n",
                                port);
                        return;
                }
                /* Apply the offset */
                dma_addr += offset;
        }

        if (q_data->flags & Q_DATA_FRAME_1D)
                flags |= VPDMA_DATA_FRAME_1D;
        if (q_data->flags & Q_DATA_MODE_TILED)
                flags |= VPDMA_DATA_MODE_TILED;

        vpdma_set_max_size(ctx->dev->vpdma, VPDMA_MAX_SIZE1,
                           MAX_W, MAX_H);

        vpdma_add_out_dtd(&ctx->desc_list, q_data->width,
                          q_data->bytesperline[VPE_LUMA], &q_data->c_rect,
                          vpdma_fmt, dma_addr, MAX_OUT_WIDTH_REG1,
                          MAX_OUT_HEIGHT_REG1, p_data->channel, flags);
}

static void add_in_dtd(struct vpe_ctx *ctx, int port)
{
        struct vpe_q_data *q_data = &ctx->q_data[Q_DATA_SRC];
        const struct vpe_port_data *p_data = &port_data[port];
        struct vb2_buffer *vb = &ctx->src_vbs[p_data->vb_index]->vb2_buf;
        struct vb2_v4l2_buffer *vbuf = to_vb2_v4l2_buffer(vb);
        struct vpe_fmt *fmt = q_data->fmt;
        const struct vpdma_data_format *vpdma_fmt;
        int mv_buf_selector = ctx->src_mv_buf_selector;
        int field = vbuf->field == V4L2_FIELD_BOTTOM;
        int frame_width, frame_height;
        dma_addr_t dma_addr;
        u32 flags = 0;
        u32 offset = 0;

        if (port == VPE_PORT_MV_IN) {
                vpdma_fmt = &vpdma_misc_fmts[VPDMA_DATA_FMT_MV];
                dma_addr = ctx->mv_buf_dma[mv_buf_selector];
        } else {
                /* to incorporate interleaved formats */
                int plane = fmt->coplanar ? p_data->vb_part : 0;

                vpdma_fmt = fmt->vpdma_fmt[plane];
                /*
                 * If we are using a single plane buffer and
                 * we need to set a separate vpdma chroma channel.
                 */
                if (q_data->nplanes == 1 && plane) {
                        dma_addr = vb2_dma_contig_plane_dma_addr(vb, 0);
                        /* Compute required offset */
                        offset = q_data->bytesperline[0] * q_data->height;
                } else {
                        dma_addr = vb2_dma_contig_plane_dma_addr(vb, plane);
                        /* Use address as is, no offset */
                        offset = 0;
                }
                if (!dma_addr) {
                        vpe_err(ctx->dev,
                                "acquiring output buffer(%d) dma_addr failed\n",
                                port);
                        return;
                }
                /* Apply the offset */
                dma_addr += offset;

                if (q_data->flags & Q_DATA_INTERLACED_SEQ_TB) {
                        /*
                         * Use top or bottom field from same vb alternately
                         * f,f-1,f-2 = TBT when seq is even
                         * f,f-1,f-2 = BTB when seq is odd
                         */
                        field = (p_data->vb_index + (ctx->sequence % 2)) % 2;

                        if (field) {
                                /*
                                 * bottom field of a SEQ_TB buffer
                                 * Skip the top field data by
                                 */
                                int height = q_data->height / 2;
                                int bpp = fmt->fourcc == V4L2_PIX_FMT_NV12 ?
                                                1 : (vpdma_fmt->depth >> 3);
                                if (plane)
                                        height /= 2;
                                dma_addr += q_data->width * height * bpp;
                        }
                }
        }

        if (q_data->flags & Q_DATA_FRAME_1D)
                flags |= VPDMA_DATA_FRAME_1D;
        if (q_data->flags & Q_DATA_MODE_TILED)
                flags |= VPDMA_DATA_MODE_TILED;

        frame_width = q_data->c_rect.width;
        frame_height = q_data->c_rect.height;

        if (p_data->vb_part && fmt->fourcc == V4L2_PIX_FMT_NV12)
                frame_height /= 2;

        vpdma_add_in_dtd(&ctx->desc_list, q_data->width,
                         q_data->bytesperline[VPE_LUMA], &q_data->c_rect,
                vpdma_fmt, dma_addr, p_data->channel, field, flags, frame_width,
                frame_height, 0, 0);
}

/*
 * Enable the expected IRQ sources
 */
static void enable_irqs(struct vpe_ctx *ctx)
{
        write_reg(ctx->dev, VPE_INT0_ENABLE0_SET, VPE_INT0_LIST0_COMPLETE);
        write_reg(ctx->dev, VPE_INT0_ENABLE1_SET, VPE_DEI_ERROR_INT |
                                VPE_DS1_UV_ERROR_INT);

        vpdma_enable_list_complete_irq(ctx->dev->vpdma, 0, 0, true);
}

static void disable_irqs(struct vpe_ctx *ctx)
{
        write_reg(ctx->dev, VPE_INT0_ENABLE0_CLR, 0xffffffff);
        write_reg(ctx->dev, VPE_INT0_ENABLE1_CLR, 0xffffffff);

        vpdma_enable_list_complete_irq(ctx->dev->vpdma, 0, 0, false);
}

/* device_run() - prepares and starts the device
 *
 * This function is only called when both the source and destination
 * buffers are in place.
 */
static void device_run(void *priv)
{
        struct vpe_ctx *ctx = priv;
        struct sc_data *sc = ctx->dev->sc;
        struct vpe_q_data *d_q_data = &ctx->q_data[Q_DATA_DST];
        struct vpe_q_data *s_q_data = &ctx->q_data[Q_DATA_SRC];

        if (ctx->deinterlacing && s_q_data->flags & Q_DATA_INTERLACED_SEQ_TB &&
                ctx->sequence % 2 == 0) {
                /* When using SEQ_TB buffers, When using it first time,
                 * No need to remove the buffer as the next field is present
                 * in the same buffer. (so that job_ready won't fail)
                 * It will be removed when using bottom field
                 */
                ctx->src_vbs[0] = v4l2_m2m_next_src_buf(ctx->fh.m2m_ctx);
                WARN_ON(ctx->src_vbs[0] == NULL);
        } else {
                ctx->src_vbs[0] = v4l2_m2m_src_buf_remove(ctx->fh.m2m_ctx);
                WARN_ON(ctx->src_vbs[0] == NULL);
        }

        ctx->dst_vb = v4l2_m2m_dst_buf_remove(ctx->fh.m2m_ctx);
        WARN_ON(ctx->dst_vb == NULL);

        if (ctx->deinterlacing) {

                if (ctx->src_vbs[2] == NULL) {
                        ctx->src_vbs[2] = ctx->src_vbs[0];
                        WARN_ON(ctx->src_vbs[2] == NULL);
                        ctx->src_vbs[1] = ctx->src_vbs[0];
                        WARN_ON(ctx->src_vbs[1] == NULL);
                }

                /*
                 * we have output the first 2 frames through line average, we
                 * now switch to EDI de-interlacer
                 */
                if (ctx->sequence == 2)
                        config_edi_input_mode(ctx, 0x3); /* EDI (Y + UV) */
        }

        /* config descriptors */
        if (ctx->dev->loaded_mmrs != ctx->mmr_adb.dma_addr || ctx->load_mmrs) {
                vpdma_map_desc_buf(ctx->dev->vpdma, &ctx->mmr_adb);
                vpdma_add_cfd_adb(&ctx->desc_list, CFD_MMR_CLIENT, &ctx->mmr_adb);

                set_line_modes(ctx);

                ctx->dev->loaded_mmrs = ctx->mmr_adb.dma_addr;
                ctx->load_mmrs = false;
        }

        if (sc->loaded_coeff_h != ctx->sc_coeff_h.dma_addr ||
                        sc->load_coeff_h) {
                vpdma_map_desc_buf(ctx->dev->vpdma, &ctx->sc_coeff_h);
                vpdma_add_cfd_block(&ctx->desc_list, CFD_SC_CLIENT,
                        &ctx->sc_coeff_h, 0);

                sc->loaded_coeff_h = ctx->sc_coeff_h.dma_addr;
                sc->load_coeff_h = false;
        }

        if (sc->loaded_coeff_v != ctx->sc_coeff_v.dma_addr ||
                        sc->load_coeff_v) {
                vpdma_map_desc_buf(ctx->dev->vpdma, &ctx->sc_coeff_v);
                vpdma_add_cfd_block(&ctx->desc_list, CFD_SC_CLIENT,
                        &ctx->sc_coeff_v, SC_COEF_SRAM_SIZE >> 4);

                sc->loaded_coeff_v = ctx->sc_coeff_v.dma_addr;
                sc->load_coeff_v = false;
        }

        /* output data descriptors */
        if (ctx->deinterlacing)
                add_out_dtd(ctx, VPE_PORT_MV_OUT);

        if (d_q_data->colorspace == V4L2_COLORSPACE_SRGB) {
                add_out_dtd(ctx, VPE_PORT_RGB_OUT);
        } else {
                add_out_dtd(ctx, VPE_PORT_LUMA_OUT);
                if (d_q_data->fmt->coplanar)
                        add_out_dtd(ctx, VPE_PORT_CHROMA_OUT);
        }

        /* input data descriptors */
        if (ctx->deinterlacing) {
                add_in_dtd(ctx, VPE_PORT_LUMA3_IN);
                add_in_dtd(ctx, VPE_PORT_CHROMA3_IN);

                add_in_dtd(ctx, VPE_PORT_LUMA2_IN);
                add_in_dtd(ctx, VPE_PORT_CHROMA2_IN);
        }

        add_in_dtd(ctx, VPE_PORT_LUMA1_IN);
        add_in_dtd(ctx, VPE_PORT_CHROMA1_IN);

        if (ctx->deinterlacing)
                add_in_dtd(ctx, VPE_PORT_MV_IN);

        /* sync on channel control descriptors for input ports */
        vpdma_add_sync_on_channel_ctd(&ctx->desc_list, VPE_CHAN_LUMA1_IN);
        vpdma_add_sync_on_channel_ctd(&ctx->desc_list, VPE_CHAN_CHROMA1_IN);

        if (ctx->deinterlacing) {
                vpdma_add_sync_on_channel_ctd(&ctx->desc_list,
                        VPE_CHAN_LUMA2_IN);
                vpdma_add_sync_on_channel_ctd(&ctx->desc_list,
                        VPE_CHAN_CHROMA2_IN);

                vpdma_add_sync_on_channel_ctd(&ctx->desc_list,
                        VPE_CHAN_LUMA3_IN);
                vpdma_add_sync_on_channel_ctd(&ctx->desc_list,
                        VPE_CHAN_CHROMA3_IN);

                vpdma_add_sync_on_channel_ctd(&ctx->desc_list, VPE_CHAN_MV_IN);
        }

        /* sync on channel control descriptors for output ports */
        if (d_q_data->colorspace == V4L2_COLORSPACE_SRGB) {
                vpdma_add_sync_on_channel_ctd(&ctx->desc_list,
                        VPE_CHAN_RGB_OUT);
        } else {
                vpdma_add_sync_on_channel_ctd(&ctx->desc_list,
                        VPE_CHAN_LUMA_OUT);
                if (d_q_data->fmt->coplanar)
                        vpdma_add_sync_on_channel_ctd(&ctx->desc_list,
                                VPE_CHAN_CHROMA_OUT);
        }

        if (ctx->deinterlacing)
                vpdma_add_sync_on_channel_ctd(&ctx->desc_list, VPE_CHAN_MV_OUT);

        enable_irqs(ctx);

        vpdma_map_desc_buf(ctx->dev->vpdma, &ctx->desc_list.buf);
        vpdma_submit_descs(ctx->dev->vpdma, &ctx->desc_list, 0);
}

static void dei_error(struct vpe_ctx *ctx)
{
        dev_warn(ctx->dev->v4l2_dev.dev,
                "received DEI error interrupt\n");
}

static void ds1_uv_error(struct vpe_ctx *ctx)
{
        dev_warn(ctx->dev->v4l2_dev.dev,
                "received downsampler error interrupt\n");
}

static irqreturn_t vpe_irq(int irq_vpe, void *data)
{
        struct vpe_dev *dev = (struct vpe_dev *)data;
        struct vpe_ctx *ctx;
        struct vpe_q_data *d_q_data;
        struct vb2_v4l2_buffer *s_vb, *d_vb;
        unsigned long flags;
        u32 irqst0, irqst1;
        bool list_complete = false;

        irqst0 = read_reg(dev, VPE_INT0_STATUS0);
        if (irqst0) {
                write_reg(dev, VPE_INT0_STATUS0_CLR, irqst0);
                vpe_dbg(dev, "INT0_STATUS0 = 0x%08x\n", irqst0);
        }

        irqst1 = read_reg(dev, VPE_INT0_STATUS1);
        if (irqst1) {
                write_reg(dev, VPE_INT0_STATUS1_CLR, irqst1);
                vpe_dbg(dev, "INT0_STATUS1 = 0x%08x\n", irqst1);
        }

        ctx = v4l2_m2m_get_curr_priv(dev->m2m_dev);
        if (!ctx) {
                vpe_err(dev, "instance released before end of transaction\n");
                goto handled;
        }

        if (irqst1) {
                if (irqst1 & VPE_DEI_ERROR_INT) {
                        irqst1 &= ~VPE_DEI_ERROR_INT;
                        dei_error(ctx);
                }
                if (irqst1 & VPE_DS1_UV_ERROR_INT) {
                        irqst1 &= ~VPE_DS1_UV_ERROR_INT;
                        ds1_uv_error(ctx);
                }
        }

        if (irqst0) {
                if (irqst0 & VPE_INT0_LIST0_COMPLETE)
                        vpdma_clear_list_stat(ctx->dev->vpdma, 0, 0);

                irqst0 &= ~(VPE_INT0_LIST0_COMPLETE);
                list_complete = true;
        }

        if (irqst0 | irqst1) {
                dev_warn(dev->v4l2_dev.dev, "Unexpected interrupt: INT0_STATUS0 = 0x%08x, INT0_STATUS1 = 0x%08x\n",
                        irqst0, irqst1);
        }

        /*
         * Setup next operation only when list complete IRQ occurs
         * otherwise, skip the following code
         */
        if (!list_complete)
                goto handled;

        disable_irqs(ctx);

        vpdma_unmap_desc_buf(dev->vpdma, &ctx->desc_list.buf);
        vpdma_unmap_desc_buf(dev->vpdma, &ctx->mmr_adb);
        vpdma_unmap_desc_buf(dev->vpdma, &ctx->sc_coeff_h);
        vpdma_unmap_desc_buf(dev->vpdma, &ctx->sc_coeff_v);

        vpdma_reset_desc_list(&ctx->desc_list);

         /* the previous dst mv buffer becomes the next src mv buffer */
        ctx->src_mv_buf_selector = !ctx->src_mv_buf_selector;

        if (ctx->aborting)
                goto finished;

        s_vb = ctx->src_vbs[0];
        d_vb = ctx->dst_vb;

        d_vb->flags = s_vb->flags;
        d_vb->vb2_buf.timestamp = s_vb->vb2_buf.timestamp;

        if (s_vb->flags & V4L2_BUF_FLAG_TIMECODE)
                d_vb->timecode = s_vb->timecode;

        d_vb->sequence = ctx->sequence;

        d_q_data = &ctx->q_data[Q_DATA_DST];
        if (d_q_data->flags & Q_IS_INTERLACED) {
                d_vb->field = ctx->field;
                if (ctx->field == V4L2_FIELD_BOTTOM) {
                        ctx->sequence++;
                        ctx->field = V4L2_FIELD_TOP;
                } else {
                        WARN_ON(ctx->field != V4L2_FIELD_TOP);
                        ctx->field = V4L2_FIELD_BOTTOM;
                }
        } else {
                d_vb->field = V4L2_FIELD_NONE;
                ctx->sequence++;
        }

        if (ctx->deinterlacing) {
                /*
                 * Allow source buffer to be dequeued only if it won't be used
                 * in the next iteration. All vbs are initialized to first
                 * buffer and we are shifting buffers every iteration, for the
                 * first two iterations, no buffer will be dequeued.
                 * This ensures that driver will keep (n-2)th (n-1)th and (n)th
                 * field when deinterlacing is enabled
                 */
                if (ctx->src_vbs[2] != ctx->src_vbs[1])
                        s_vb = ctx->src_vbs[2];
                else
                        s_vb = NULL;
        }

        spin_lock_irqsave(&dev->lock, flags);

        if (s_vb)
                v4l2_m2m_buf_done(s_vb, VB2_BUF_STATE_DONE);

        v4l2_m2m_buf_done(d_vb, VB2_BUF_STATE_DONE);

        spin_unlock_irqrestore(&dev->lock, flags);

        if (ctx->deinterlacing) {
                ctx->src_vbs[2] = ctx->src_vbs[1];
                ctx->src_vbs[1] = ctx->src_vbs[0];
        }

        /*
         * Since the vb2_buf_done has already been called fir therse
         * buffer we can now NULL them out so that we won't try
         * to clean out stray pointer later on.
        */
        ctx->src_vbs[0] = NULL;
        ctx->dst_vb = NULL;

        ctx->bufs_completed++;
        if (ctx->bufs_completed < ctx->bufs_per_job && job_ready(ctx)) {
                device_run(ctx);
                goto handled;
        }

finished:
        vpe_dbg(ctx->dev, "finishing transaction\n");
        ctx->bufs_completed = 0;
        v4l2_m2m_job_finish(dev->m2m_dev, ctx->fh.m2m_ctx);
handled:
        return IRQ_HANDLED;
}

/*
 * video ioctls
 */
static int vpe_querycap(struct file *file, void *priv,
                        struct v4l2_capability *cap)
{
        strscpy(cap->driver, VPE_MODULE_NAME, sizeof(cap->driver));
        strscpy(cap->card, VPE_MODULE_NAME, sizeof(cap->card));
        snprintf(cap->bus_info, sizeof(cap->bus_info), "platform:%s",
                VPE_MODULE_NAME);
        cap->device_caps  = V4L2_CAP_VIDEO_M2M_MPLANE | V4L2_CAP_STREAMING;
        cap->capabilities = cap->device_caps | V4L2_CAP_DEVICE_CAPS;
        return 0;
}

static int __enum_fmt(struct v4l2_fmtdesc *f, u32 type)
{
        int i, index;
        struct vpe_fmt *fmt = NULL;

        index = 0;
        for (i = 0; i < ARRAY_SIZE(vpe_formats); ++i) {
                if (vpe_formats[i].types & type) {
                        if (index == f->index) {
                                fmt = &vpe_formats[i];
                                break;
                        }
                        index++;
                }
        }

        if (!fmt)
                return -EINVAL;

        strscpy(f->description, fmt->name, sizeof(f->description));
        f->pixelformat = fmt->fourcc;
        return 0;
}

static int vpe_enum_fmt(struct file *file, void *priv,
                                struct v4l2_fmtdesc *f)
{
        if (V4L2_TYPE_IS_OUTPUT(f->type))
                return __enum_fmt(f, VPE_FMT_TYPE_OUTPUT);

        return __enum_fmt(f, VPE_FMT_TYPE_CAPTURE);
}

static int vpe_g_fmt(struct file *file, void *priv, struct v4l2_format *f)
{
        struct v4l2_pix_format_mplane *pix = &f->fmt.pix_mp;
        struct vpe_ctx *ctx = file2ctx(file);
        struct vb2_queue *vq;
        struct vpe_q_data *q_data;
        int i;

        vq = v4l2_m2m_get_vq(ctx->fh.m2m_ctx, f->type);
        if (!vq)
                return -EINVAL;

        q_data = get_q_data(ctx, f->type);

        pix->width = q_data->width;
        pix->height = q_data->height;
        pix->pixelformat = q_data->fmt->fourcc;
        pix->field = q_data->field;

        if (V4L2_TYPE_IS_OUTPUT(f->type)) {
                pix->colorspace = q_data->colorspace;
        } else {
                struct vpe_q_data *s_q_data;

                /* get colorspace from the source queue */
                s_q_data = get_q_data(ctx, V4L2_BUF_TYPE_VIDEO_OUTPUT_MPLANE);

                pix->colorspace = s_q_data->colorspace;
        }

        pix->num_planes = q_data->nplanes;

        for (i = 0; i < pix->num_planes; i++) {
                pix->plane_fmt[i].bytesperline = q_data->bytesperline[i];
                pix->plane_fmt[i].sizeimage = q_data->sizeimage[i];
        }

        return 0;
}

static int __vpe_try_fmt(struct vpe_ctx *ctx, struct v4l2_format *f,
                       struct vpe_fmt *fmt, int type)
{
        struct v4l2_pix_format_mplane *pix = &f->fmt.pix_mp;
        struct v4l2_plane_pix_format *plane_fmt;
        unsigned int w_align;
        int i, depth, depth_bytes, height;
        unsigned int stride = 0;

        if (!fmt || !(fmt->types & type)) {
                vpe_err(ctx->dev, "Fourcc format (0x%08x) invalid.\n",
                        pix->pixelformat);
                return -EINVAL;
        }

        if (pix->field != V4L2_FIELD_NONE && pix->field != V4L2_FIELD_ALTERNATE
                        && pix->field != V4L2_FIELD_SEQ_TB)
                pix->field = V4L2_FIELD_NONE;

        depth = fmt->vpdma_fmt[VPE_LUMA]->depth;

        /*
         * the line stride should 16 byte aligned for VPDMA to work, based on
         * the bytes per pixel, figure out how much the width should be aligned
         * to make sure line stride is 16 byte aligned
         */
        depth_bytes = depth >> 3;

        if (depth_bytes == 3) {
                /*
                 * if bpp is 3(as in some RGB formats), the pixel width doesn't
                 * really help in ensuring line stride is 16 byte aligned
                 */
                w_align = 4;
        } else {
                /*
                 * for the remainder bpp(4, 2 and 1), the pixel width alignment
                 * can ensure a line stride alignment of 16 bytes. For example,
                 * if bpp is 2, then the line stride can be 16 byte aligned if
                 * the width is 8 byte aligned
                 */

                /*
                 * HACK: using order_base_2() here causes lots of asm output
                 * errors with smatch, on i386:
                 * ./arch/x86/include/asm/bitops.h:457:22:
                 *               warning: asm output is not an lvalue
                 * Perhaps some gcc optimization is doing the wrong thing
                 * there.
                 * Let's get rid of them by doing the calculus on two steps
                 */
                w_align = roundup_pow_of_two(VPDMA_DESC_ALIGN / depth_bytes);
                w_align = ilog2(w_align);
        }

        v4l_bound_align_image(&pix->width, MIN_W, MAX_W, w_align,
                              &pix->height, MIN_H, MAX_H, H_ALIGN,
                              S_ALIGN);

        if (!pix->num_planes)
                pix->num_planes = fmt->coplanar ? 2 : 1;
        else if (pix->num_planes > 1 && !fmt->coplanar)
                pix->num_planes = 1;

        pix->pixelformat = fmt->fourcc;

        /*
         * For the actual image parameters, we need to consider the field
         * height of the image for SEQ_TB buffers.
         */
        if (pix->field == V4L2_FIELD_SEQ_TB)
                height = pix->height / 2;
        else
                height = pix->height;

        if (!pix->colorspace) {
                if (fmt->fourcc == V4L2_PIX_FMT_RGB24 ||
                                fmt->fourcc == V4L2_PIX_FMT_BGR24 ||
                                fmt->fourcc == V4L2_PIX_FMT_RGB32 ||
                                fmt->fourcc == V4L2_PIX_FMT_BGR32) {
                        pix->colorspace = V4L2_COLORSPACE_SRGB;
                } else {
                        if (height > 1280)      /* HD */
                                pix->colorspace = V4L2_COLORSPACE_REC709;
                        else                    /* SD */
                                pix->colorspace = V4L2_COLORSPACE_SMPTE170M;
                }
        }

        memset(pix->reserved, 0, sizeof(pix->reserved));
        for (i = 0; i < pix->num_planes; i++) {
                plane_fmt = &pix->plane_fmt[i];
                depth = fmt->vpdma_fmt[i]->depth;

                stride = (pix->width * fmt->vpdma_fmt[VPE_LUMA]->depth) >> 3;
                if (stride > plane_fmt->bytesperline)
                        plane_fmt->bytesperline = stride;

                plane_fmt->bytesperline = ALIGN(plane_fmt->bytesperline,
                                                VPDMA_STRIDE_ALIGN);

                if (i == VPE_LUMA) {
                        plane_fmt->sizeimage = pix->height *
                                               plane_fmt->bytesperline;

                        if (pix->num_planes == 1 && fmt->coplanar)
                                plane_fmt->sizeimage += pix->height *
                                        plane_fmt->bytesperline *
                                        fmt->vpdma_fmt[VPE_CHROMA]->depth >> 3;

                } else { /* i == VIP_CHROMA */
                        plane_fmt->sizeimage = (pix->height *
                                               plane_fmt->bytesperline *
                                               depth) >> 3;
                }
                memset(plane_fmt->reserved, 0, sizeof(plane_fmt->reserved));
        }

        return 0;
}

static int vpe_try_fmt(struct file *file, void *priv, struct v4l2_format *f)
{
        struct vpe_ctx *ctx = file2ctx(file);
        struct vpe_fmt *fmt = find_format(f);

        if (V4L2_TYPE_IS_OUTPUT(f->type))
                return __vpe_try_fmt(ctx, f, fmt, VPE_FMT_TYPE_OUTPUT);
        else
                return __vpe_try_fmt(ctx, f, fmt, VPE_FMT_TYPE_CAPTURE);
}

static int __vpe_s_fmt(struct vpe_ctx *ctx, struct v4l2_format *f)
{
        struct v4l2_pix_format_mplane *pix = &f->fmt.pix_mp;
        struct v4l2_plane_pix_format *plane_fmt;
        struct vpe_q_data *q_data;
        struct vb2_queue *vq;
        int i;

        vq = v4l2_m2m_get_vq(ctx->fh.m2m_ctx, f->type);
        if (!vq)
                return -EINVAL;

        if (vb2_is_busy(vq)) {
                vpe_err(ctx->dev, "queue busy\n");
                return -EBUSY;
        }

        q_data = get_q_data(ctx, f->type);
        if (!q_data)
                return -EINVAL;

        q_data->fmt             = find_format(f);
        q_data->width           = pix->width;
        q_data->height          = pix->height;
        q_data->colorspace      = pix->colorspace;
        q_data->field           = pix->field;
        q_data->nplanes         = pix->num_planes;

        for (i = 0; i < pix->num_planes; i++) {
                plane_fmt = &pix->plane_fmt[i];

                q_data->bytesperline[i] = plane_fmt->bytesperline;
                q_data->sizeimage[i]    = plane_fmt->sizeimage;
        }

        q_data->c_rect.left     = 0;
        q_data->c_rect.top      = 0;
        q_data->c_rect.width    = q_data->width;
        q_data->c_rect.height   = q_data->height;

        if (q_data->field == V4L2_FIELD_ALTERNATE)
                q_data->flags |= Q_DATA_INTERLACED_ALTERNATE;
        else if (q_data->field == V4L2_FIELD_SEQ_TB)
                q_data->flags |= Q_DATA_INTERLACED_SEQ_TB;
        else
                q_data->flags &= ~Q_IS_INTERLACED;

        /* the crop height is halved for the case of SEQ_TB buffers */
        if (q_data->flags & Q_DATA_INTERLACED_SEQ_TB)
                q_data->c_rect.height /= 2;

        vpe_dbg(ctx->dev, "Setting format for type %d, wxh: %dx%d, fmt: %d bpl_y %d",
                f->type, q_data->width, q_data->height, q_data->fmt->fourcc,
                q_data->bytesperline[VPE_LUMA]);
        if (q_data->nplanes == 2)
                vpe_dbg(ctx->dev, " bpl_uv %d\n",
                        q_data->bytesperline[VPE_CHROMA]);

        return 0;
}

static int vpe_s_fmt(struct file *file, void *priv, struct v4l2_format *f)
{
        int ret;
        struct vpe_ctx *ctx = file2ctx(file);

        ret = vpe_try_fmt(file, priv, f);
        if (ret)
                return ret;

        ret = __vpe_s_fmt(ctx, f);
        if (ret)
                return ret;

        if (V4L2_TYPE_IS_OUTPUT(f->type))
                set_src_registers(ctx);
        else
                set_dst_registers(ctx);

        return set_srcdst_params(ctx);
}

static int __vpe_try_selection(struct vpe_ctx *ctx, struct v4l2_selection *s)
{
        struct vpe_q_data *q_data;
        int height;

        if ((s->type != V4L2_BUF_TYPE_VIDEO_CAPTURE) &&
            (s->type != V4L2_BUF_TYPE_VIDEO_OUTPUT))
                return -EINVAL;

        q_data = get_q_data(ctx, s->type);
        if (!q_data)
                return -EINVAL;

        switch (s->target) {
        case V4L2_SEL_TGT_COMPOSE:
                /*
                 * COMPOSE target is only valid for capture buffer type, return
                 * error for output buffer type
                 */
                if (s->type == V4L2_BUF_TYPE_VIDEO_OUTPUT)
                        return -EINVAL;
                break;
        case V4L2_SEL_TGT_CROP:
                /*
                 * CROP target is only valid for output buffer type, return
                 * error for capture buffer type
                 */
                if (s->type == V4L2_BUF_TYPE_VIDEO_CAPTURE)
                        return -EINVAL;
                break;
        /*
         * bound and default crop/compose targets are invalid targets to
         * try/set
         */
        default:
                return -EINVAL;
        }

        /*
         * For SEQ_TB buffers, crop height should be less than the height of
         * the field height, not the buffer height
         */
        if (q_data->flags & Q_DATA_INTERLACED_SEQ_TB)
                height = q_data->height / 2;
        else
                height = q_data->height;

        if (s->r.top < 0 || s->r.left < 0) {
                vpe_err(ctx->dev, "negative values for top and left\n");
                s->r.top = s->r.left = 0;
        }

        v4l_bound_align_image(&s->r.width, MIN_W, q_data->width, 1,
                &s->r.height, MIN_H, height, H_ALIGN, S_ALIGN);

        /* adjust left/top if cropping rectangle is out of bounds */
        if (s->r.left + s->r.width > q_data->width)
                s->r.left = q_data->width - s->r.width;
        if (s->r.top + s->r.height > q_data->height)
                s->r.top = q_data->height - s->r.height;

        return 0;
}

static int vpe_g_selection(struct file *file, void *fh,
                struct v4l2_selection *s)
{
        struct vpe_ctx *ctx = file2ctx(file);
        struct vpe_q_data *q_data;
        bool use_c_rect = false;

        if ((s->type != V4L2_BUF_TYPE_VIDEO_CAPTURE) &&
            (s->type != V4L2_BUF_TYPE_VIDEO_OUTPUT))
                return -EINVAL;

        q_data = get_q_data(ctx, s->type);
        if (!q_data)
                return -EINVAL;

        switch (s->target) {
        case V4L2_SEL_TGT_COMPOSE_DEFAULT:
        case V4L2_SEL_TGT_COMPOSE_BOUNDS:
                if (s->type == V4L2_BUF_TYPE_VIDEO_OUTPUT)
                        return -EINVAL;
                break;
        case V4L2_SEL_TGT_CROP_BOUNDS:
        case V4L2_SEL_TGT_CROP_DEFAULT:
                if (s->type == V4L2_BUF_TYPE_VIDEO_CAPTURE)
                        return -EINVAL;
                break;
        case V4L2_SEL_TGT_COMPOSE:
                if (s->type == V4L2_BUF_TYPE_VIDEO_OUTPUT)
                        return -EINVAL;
                use_c_rect = true;
                break;
        case V4L2_SEL_TGT_CROP:
                if (s->type == V4L2_BUF_TYPE_VIDEO_CAPTURE)
                        return -EINVAL;
                use_c_rect = true;
                break;
        default:
                return -EINVAL;
        }

        if (use_c_rect) {
                /*
                 * for CROP/COMPOSE target type, return c_rect params from the
                 * respective buffer type
                 */
                s->r = q_data->c_rect;
        } else {
                /*
                 * for DEFAULT/BOUNDS target type, return width and height from
                 * S_FMT of the respective buffer type
                 */
                s->r.left = 0;
                s->r.top = 0;
                s->r.width = q_data->width;
                s->r.height = q_data->height;
        }

        return 0;
}


static int vpe_s_selection(struct file *file, void *fh,
                struct v4l2_selection *s)
{
        struct vpe_ctx *ctx = file2ctx(file);
        struct vpe_q_data *q_data;
        struct v4l2_selection sel = *s;
        int ret;

        ret = __vpe_try_selection(ctx, &sel);
        if (ret)
                return ret;

        q_data = get_q_data(ctx, sel.type);
        if (!q_data)
                return -EINVAL;

        if ((q_data->c_rect.left == sel.r.left) &&
                        (q_data->c_rect.top == sel.r.top) &&
                        (q_data->c_rect.width == sel.r.width) &&
                        (q_data->c_rect.height == sel.r.height)) {
                vpe_dbg(ctx->dev,
                        "requested crop/compose values are already set\n");
                return 0;
        }

        q_data->c_rect = sel.r;

        return set_srcdst_params(ctx);
}

/*
 * defines number of buffers/frames a context can process with VPE before
 * switching to a different context. default value is 1 buffer per context
 */
#define V4L2_CID_VPE_BUFS_PER_JOB               (V4L2_CID_USER_TI_VPE_BASE + 0)

static int vpe_s_ctrl(struct v4l2_ctrl *ctrl)
{
        struct vpe_ctx *ctx =
                container_of(ctrl->handler, struct vpe_ctx, hdl);

        switch (ctrl->id) {
        case V4L2_CID_VPE_BUFS_PER_JOB:
                ctx->bufs_per_job = ctrl->val;
                break;

        default:
                vpe_err(ctx->dev, "Invalid control\n");
                return -EINVAL;
        }

        return 0;
}

static const struct v4l2_ctrl_ops vpe_ctrl_ops = {
        .s_ctrl = vpe_s_ctrl,
};

static const struct v4l2_ioctl_ops vpe_ioctl_ops = {
        .vidioc_querycap                = vpe_querycap,

        .vidioc_enum_fmt_vid_cap_mplane = vpe_enum_fmt,
        .vidioc_g_fmt_vid_cap_mplane    = vpe_g_fmt,
        .vidioc_try_fmt_vid_cap_mplane  = vpe_try_fmt,
        .vidioc_s_fmt_vid_cap_mplane    = vpe_s_fmt,

        .vidioc_enum_fmt_vid_out_mplane = vpe_enum_fmt,
        .vidioc_g_fmt_vid_out_mplane    = vpe_g_fmt,
        .vidioc_try_fmt_vid_out_mplane  = vpe_try_fmt,
        .vidioc_s_fmt_vid_out_mplane    = vpe_s_fmt,

        .vidioc_g_selection             = vpe_g_selection,
        .vidioc_s_selection             = vpe_s_selection,

        .vidioc_reqbufs                 = v4l2_m2m_ioctl_reqbufs,
        .vidioc_querybuf                = v4l2_m2m_ioctl_querybuf,
        .vidioc_qbuf                    = v4l2_m2m_ioctl_qbuf,
        .vidioc_dqbuf                   = v4l2_m2m_ioctl_dqbuf,
        .vidioc_expbuf                  = v4l2_m2m_ioctl_expbuf,
        .vidioc_streamon                = v4l2_m2m_ioctl_streamon,
        .vidioc_streamoff               = v4l2_m2m_ioctl_streamoff,

        .vidioc_subscribe_event         = v4l2_ctrl_subscribe_event,
        .vidioc_unsubscribe_event       = v4l2_event_unsubscribe,
};

/*
 * Queue operations
 */

static int vpe_queue_setup(struct vb2_queue *vq,
                           unsigned int *nbuffers, unsigned int *nplanes,
                           unsigned int sizes[], struct device *alloc_devs[])
{
        int i;
        struct vpe_ctx *ctx = vb2_get_drv_priv(vq);
        struct vpe_q_data *q_data;

        q_data = get_q_data(ctx, vq->type);

        *nplanes = q_data->nplanes;

        for (i = 0; i < *nplanes; i++)
                sizes[i] = q_data->sizeimage[i];

        vpe_dbg(ctx->dev, "get %d buffer(s) of size %d", *nbuffers,
                sizes[VPE_LUMA]);
        if (q_data->nplanes == 2)
                vpe_dbg(ctx->dev, " and %d\n", sizes[VPE_CHROMA]);

        return 0;
}

static int vpe_buf_prepare(struct vb2_buffer *vb)
{
        struct vb2_v4l2_buffer *vbuf = to_vb2_v4l2_buffer(vb);
        struct vpe_ctx *ctx = vb2_get_drv_priv(vb->vb2_queue);
        struct vpe_q_data *q_data;
        int i, num_planes;

        vpe_dbg(ctx->dev, "type: %d\n", vb->vb2_queue->type);

        q_data = get_q_data(ctx, vb->vb2_queue->type);
        num_planes = q_data->nplanes;

        if (vb->vb2_queue->type == V4L2_BUF_TYPE_VIDEO_OUTPUT_MPLANE) {
                if (!(q_data->flags & Q_IS_INTERLACED)) {
                        vbuf->field = V4L2_FIELD_NONE;
                } else {
                        if (vbuf->field != V4L2_FIELD_TOP &&
                            vbuf->field != V4L2_FIELD_BOTTOM &&
                            vbuf->field != V4L2_FIELD_SEQ_TB)
                                return -EINVAL;
                }
        }

        for (i = 0; i < num_planes; i++) {
                if (vb2_plane_size(vb, i) < q_data->sizeimage[i]) {
                        vpe_err(ctx->dev,
                                "data will not fit into plane (%lu < %lu)\n",
                                vb2_plane_size(vb, i),
                                (long) q_data->sizeimage[i]);
                        return -EINVAL;
                }
        }

        for (i = 0; i < num_planes; i++)
                vb2_set_plane_payload(vb, i, q_data->sizeimage[i]);

        return 0;
}

static void vpe_buf_queue(struct vb2_buffer *vb)
{
        struct vb2_v4l2_buffer *vbuf = to_vb2_v4l2_buffer(vb);
        struct vpe_ctx *ctx = vb2_get_drv_priv(vb->vb2_queue);

        v4l2_m2m_buf_queue(ctx->fh.m2m_ctx, vbuf);
}

static int check_srcdst_sizes(struct vpe_ctx *ctx)
{
        struct vpe_q_data *s_q_data =  &ctx->q_data[Q_DATA_SRC];
        struct vpe_q_data *d_q_data =  &ctx->q_data[Q_DATA_DST];
        unsigned int src_w = s_q_data->c_rect.width;
        unsigned int src_h = s_q_data->c_rect.height;
        unsigned int dst_w = d_q_data->c_rect.width;
        unsigned int dst_h = d_q_data->c_rect.height;

        if (src_w == dst_w && src_h == dst_h)
                return 0;

        if (src_h <= SC_MAX_PIXEL_HEIGHT &&
            src_w <= SC_MAX_PIXEL_WIDTH &&
            dst_h <= SC_MAX_PIXEL_HEIGHT &&
            dst_w <= SC_MAX_PIXEL_WIDTH)
                return 0;

        return -1;
}

static void vpe_return_all_buffers(struct vpe_ctx *ctx,  struct vb2_queue *q,
                                   enum vb2_buffer_state state)
{
        struct vb2_v4l2_buffer *vb;
        unsigned long flags;

        for (;;) {
                if (V4L2_TYPE_IS_OUTPUT(q->type))
                        vb = v4l2_m2m_src_buf_remove(ctx->fh.m2m_ctx);
                else
                        vb = v4l2_m2m_dst_buf_remove(ctx->fh.m2m_ctx);
                if (!vb)
                        break;
                spin_lock_irqsave(&ctx->dev->lock, flags);
                v4l2_m2m_buf_done(vb, state);
                spin_unlock_irqrestore(&ctx->dev->lock, flags);
        }

        /*
         * Cleanup the in-transit vb2 buffers that have been
         * removed from their respective queue already but for
         * which procecessing has not been completed yet.
         */
        if (V4L2_TYPE_IS_OUTPUT(q->type)) {
                spin_lock_irqsave(&ctx->dev->lock, flags);

                if (ctx->src_vbs[2])
                        v4l2_m2m_buf_done(ctx->src_vbs[2], state);

                if (ctx->src_vbs[1] && (ctx->src_vbs[1] != ctx->src_vbs[2]))
                        v4l2_m2m_buf_done(ctx->src_vbs[1], state);

                if (ctx->src_vbs[0] &&
                    (ctx->src_vbs[0] != ctx->src_vbs[1]) &&
                    (ctx->src_vbs[0] != ctx->src_vbs[2]))
                        v4l2_m2m_buf_done(ctx->src_vbs[0], state);

                ctx->src_vbs[2] = NULL;
                ctx->src_vbs[1] = NULL;
                ctx->src_vbs[0] = NULL;

                spin_unlock_irqrestore(&ctx->dev->lock, flags);
        } else {
                if (ctx->dst_vb) {
                        spin_lock_irqsave(&ctx->dev->lock, flags);

                        v4l2_m2m_buf_done(ctx->dst_vb, state);
                        ctx->dst_vb = NULL;
                        spin_unlock_irqrestore(&ctx->dev->lock, flags);
                }
        }
}

static int vpe_start_streaming(struct vb2_queue *q, unsigned int count)
{
        struct vpe_ctx *ctx = vb2_get_drv_priv(q);

        /* Check any of the size exceed maximum scaling sizes */
        if (check_srcdst_sizes(ctx)) {
                vpe_err(ctx->dev,
                        "Conversion setup failed, check source and destination parameters\n"
                        );
                vpe_return_all_buffers(ctx, q, VB2_BUF_STATE_QUEUED);
                return -EINVAL;
        }

        if (ctx->deinterlacing)
                config_edi_input_mode(ctx, 0x0);

        if (ctx->sequence != 0)
                set_srcdst_params(ctx);

        return 0;
}

static void vpe_stop_streaming(struct vb2_queue *q)
{
        struct vpe_ctx *ctx = vb2_get_drv_priv(q);

        vpe_dump_regs(ctx->dev);
        vpdma_dump_regs(ctx->dev->vpdma);

        vpe_return_all_buffers(ctx, q, VB2_BUF_STATE_ERROR);
}

static const struct vb2_ops vpe_qops = {
        .queue_setup     = vpe_queue_setup,
        .buf_prepare     = vpe_buf_prepare,
        .buf_queue       = vpe_buf_queue,
        .wait_prepare    = vb2_ops_wait_prepare,
        .wait_finish     = vb2_ops_wait_finish,
        .start_streaming = vpe_start_streaming,
        .stop_streaming  = vpe_stop_streaming,
};

static int queue_init(void *priv, struct vb2_queue *src_vq,
                      struct vb2_queue *dst_vq)
{
        struct vpe_ctx *ctx = priv;
        struct vpe_dev *dev = ctx->dev;
        int ret;

        memset(src_vq, 0, sizeof(*src_vq));
        src_vq->type = V4L2_BUF_TYPE_VIDEO_OUTPUT_MPLANE;
        src_vq->io_modes = VB2_MMAP | VB2_DMABUF;
        src_vq->drv_priv = ctx;
        src_vq->buf_struct_size = sizeof(struct v4l2_m2m_buffer);
        src_vq->ops = &vpe_qops;
        src_vq->mem_ops = &vb2_dma_contig_memops;
        src_vq->timestamp_flags = V4L2_BUF_FLAG_TIMESTAMP_COPY;
        src_vq->lock = &dev->dev_mutex;
        src_vq->dev = dev->v4l2_dev.dev;

        ret = vb2_queue_init(src_vq);
        if (ret)
                return ret;

        memset(dst_vq, 0, sizeof(*dst_vq));
        dst_vq->type = V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE;
        dst_vq->io_modes = VB2_MMAP | VB2_DMABUF;
        dst_vq->drv_priv = ctx;
        dst_vq->buf_struct_size = sizeof(struct v4l2_m2m_buffer);
        dst_vq->ops = &vpe_qops;
        dst_vq->mem_ops = &vb2_dma_contig_memops;
        dst_vq->timestamp_flags = V4L2_BUF_FLAG_TIMESTAMP_COPY;
        dst_vq->lock = &dev->dev_mutex;
        dst_vq->dev = dev->v4l2_dev.dev;

        return vb2_queue_init(dst_vq);
}

static const struct v4l2_ctrl_config vpe_bufs_per_job = {
        .ops = &vpe_ctrl_ops,
        .id = V4L2_CID_VPE_BUFS_PER_JOB,
        .name = "Buffers Per Transaction",
        .type = V4L2_CTRL_TYPE_INTEGER,
        .def = VPE_DEF_BUFS_PER_JOB,
        .min = 1,
        .max = VIDEO_MAX_FRAME,
        .step = 1,
};

/*
 * File operations
 */
static int vpe_open(struct file *file)
{
        struct vpe_dev *dev = video_drvdata(file);
        struct vpe_q_data *s_q_data;
        struct v4l2_ctrl_handler *hdl;
        struct vpe_ctx *ctx;
        int ret;

        vpe_dbg(dev, "vpe_open\n");

        ctx = kzalloc(sizeof(*ctx), GFP_KERNEL);
        if (!ctx)
                return -ENOMEM;

        ctx->dev = dev;

        if (mutex_lock_interruptible(&dev->dev_mutex)) {
                ret = -ERESTARTSYS;
                goto free_ctx;
        }

        ret = vpdma_create_desc_list(&ctx->desc_list, VPE_DESC_LIST_SIZE,
                        VPDMA_LIST_TYPE_NORMAL);
        if (ret != 0)
                goto unlock;

        ret = vpdma_alloc_desc_buf(&ctx->mmr_adb, sizeof(struct vpe_mmr_adb));
        if (ret != 0)
                goto free_desc_list;

        ret = vpdma_alloc_desc_buf(&ctx->sc_coeff_h, SC_COEF_SRAM_SIZE);
        if (ret != 0)
                goto free_mmr_adb;

        ret = vpdma_alloc_desc_buf(&ctx->sc_coeff_v, SC_COEF_SRAM_SIZE);
        if (ret != 0)
                goto free_sc_h;

        init_adb_hdrs(ctx);

        v4l2_fh_init(&ctx->fh, video_devdata(file));
        file->private_data = &ctx->fh;

        hdl = &ctx->hdl;
        v4l2_ctrl_handler_init(hdl, 1);
        v4l2_ctrl_new_custom(hdl, &vpe_bufs_per_job, NULL);
        if (hdl->error) {
                ret = hdl->error;
                goto exit_fh;
        }
        ctx->fh.ctrl_handler = hdl;
        v4l2_ctrl_handler_setup(hdl);

        s_q_data = &ctx->q_data[Q_DATA_SRC];
        s_q_data->fmt = &vpe_formats[2];
        s_q_data->width = 1920;
        s_q_data->height = 1080;
        s_q_data->nplanes = 1;
        s_q_data->bytesperline[VPE_LUMA] = (s_q_data->width *
                        s_q_data->fmt->vpdma_fmt[VPE_LUMA]->depth) >> 3;
        s_q_data->sizeimage[VPE_LUMA] = (s_q_data->bytesperline[VPE_LUMA] *
                        s_q_data->height);
        s_q_data->colorspace = V4L2_COLORSPACE_REC709;
        s_q_data->field = V4L2_FIELD_NONE;
        s_q_data->c_rect.left = 0;
        s_q_data->c_rect.top = 0;
        s_q_data->c_rect.width = s_q_data->width;
        s_q_data->c_rect.height = s_q_data->height;
        s_q_data->flags = 0;

        ctx->q_data[Q_DATA_DST] = *s_q_data;

        set_dei_shadow_registers(ctx);
        set_src_registers(ctx);
        set_dst_registers(ctx);
        ret = set_srcdst_params(ctx);
        if (ret)
                goto exit_fh;

        ctx->fh.m2m_ctx = v4l2_m2m_ctx_init(dev->m2m_dev, ctx, &queue_init);

        if (IS_ERR(ctx->fh.m2m_ctx)) {
                ret = PTR_ERR(ctx->fh.m2m_ctx);
                goto exit_fh;
        }

        v4l2_fh_add(&ctx->fh);

        /*
         * for now, just report the creation of the first instance, we can later
         * optimize the driver to enable or disable clocks when the first
         * instance is created or the last instance released
         */
        if (atomic_inc_return(&dev->num_instances) == 1)
                vpe_dbg(dev, "first instance created\n");

        ctx->bufs_per_job = VPE_DEF_BUFS_PER_JOB;

        ctx->load_mmrs = true;

        vpe_dbg(dev, "created instance %p, m2m_ctx: %p\n",
                ctx, ctx->fh.m2m_ctx);

        mutex_unlock(&dev->dev_mutex);

        return 0;
exit_fh:
        v4l2_ctrl_handler_free(hdl);
        v4l2_fh_exit(&ctx->fh);
        vpdma_free_desc_buf(&ctx->sc_coeff_v);
free_sc_h:
        vpdma_free_desc_buf(&ctx->sc_coeff_h);
free_mmr_adb:
        vpdma_free_desc_buf(&ctx->mmr_adb);
free_desc_list:
        vpdma_free_desc_list(&ctx->desc_list);
unlock:
        mutex_unlock(&dev->dev_mutex);
free_ctx:
        kfree(ctx);
        return ret;
}

static int vpe_release(struct file *file)
{
        struct vpe_dev *dev = video_drvdata(file);
        struct vpe_ctx *ctx = file2ctx(file);

        vpe_dbg(dev, "releasing instance %p\n", ctx);

        mutex_lock(&dev->dev_mutex);
        free_mv_buffers(ctx);
        vpdma_free_desc_list(&ctx->desc_list);
        vpdma_free_desc_buf(&ctx->mmr_adb);

        vpdma_free_desc_buf(&ctx->sc_coeff_v);
        vpdma_free_desc_buf(&ctx->sc_coeff_h);

        v4l2_fh_del(&ctx->fh);
        v4l2_fh_exit(&ctx->fh);
        v4l2_ctrl_handler_free(&ctx->hdl);
        v4l2_m2m_ctx_release(ctx->fh.m2m_ctx);

        kfree(ctx);

        /*
         * for now, just report the release of the last instance, we can later
         * optimize the driver to enable or disable clocks when the first
         * instance is created or the last instance released
         */
        if (atomic_dec_return(&dev->num_instances) == 0)
                vpe_dbg(dev, "last instance released\n");

        mutex_unlock(&dev->dev_mutex);

        return 0;
}

static const struct v4l2_file_operations vpe_fops = {
        .owner          = THIS_MODULE,
        .open           = vpe_open,
        .release        = vpe_release,
        .poll           = v4l2_m2m_fop_poll,
        .unlocked_ioctl = video_ioctl2,
        .mmap           = v4l2_m2m_fop_mmap,
};

static const struct video_device vpe_videodev = {
        .name           = VPE_MODULE_NAME,
        .fops           = &vpe_fops,
        .ioctl_ops      = &vpe_ioctl_ops,
        .minor          = -1,
        .release        = video_device_release_empty,
        .vfl_dir        = VFL_DIR_M2M,
};

static const struct v4l2_m2m_ops m2m_ops = {
        .device_run     = device_run,
        .job_ready      = job_ready,
        .job_abort      = job_abort,
};

static int vpe_runtime_get(struct platform_device *pdev)
{
        int r;

        dev_dbg(&pdev->dev, "vpe_runtime_get\n");

        r = pm_runtime_get_sync(&pdev->dev);
        WARN_ON(r < 0);
        return r < 0 ? r : 0;
}

static void vpe_runtime_put(struct platform_device *pdev)
{

        int r;

        dev_dbg(&pdev->dev, "vpe_runtime_put\n");

        r = pm_runtime_put_sync(&pdev->dev);
        WARN_ON(r < 0 && r != -ENOSYS);
}

static void vpe_fw_cb(struct platform_device *pdev)
{
        struct vpe_dev *dev = platform_get_drvdata(pdev);
        struct video_device *vfd;
        int ret;

        vfd = &dev->vfd;
        *vfd = vpe_videodev;
        vfd->lock = &dev->dev_mutex;
        vfd->v4l2_dev = &dev->v4l2_dev;

        ret = video_register_device(vfd, VFL_TYPE_GRABBER, 0);
        if (ret) {
                vpe_err(dev, "Failed to register video device\n");

                vpe_set_clock_enable(dev, 0);
                vpe_runtime_put(pdev);
                pm_runtime_disable(&pdev->dev);
                v4l2_m2m_release(dev->m2m_dev);
                v4l2_device_unregister(&dev->v4l2_dev);

                return;
        }

        video_set_drvdata(vfd, dev);
        dev_info(dev->v4l2_dev.dev, "Device registered as /dev/video%d\n",
                vfd->num);
}

static int vpe_probe(struct platform_device *pdev)
{
        struct vpe_dev *dev;
        int ret, irq, func;

        dev = devm_kzalloc(&pdev->dev, sizeof(*dev), GFP_KERNEL);
        if (!dev)
                return -ENOMEM;

        spin_lock_init(&dev->lock);

        ret = v4l2_device_register(&pdev->dev, &dev->v4l2_dev);
        if (ret)
                return ret;

        atomic_set(&dev->num_instances, 0);
        mutex_init(&dev->dev_mutex);

        dev->res = platform_get_resource_byname(pdev, IORESOURCE_MEM,
                        "vpe_top");
        /*
         * HACK: we get resource info from device tree in the form of a list of
         * VPE sub blocks, the driver currently uses only the base of vpe_top
         * for register access, the driver should be changed later to access
         * registers based on the sub block base addresses
         */
        dev->base = devm_ioremap(&pdev->dev, dev->res->start, SZ_32K);
        if (!dev->base) {
                ret = -ENOMEM;
                goto v4l2_dev_unreg;
        }

        irq = platform_get_irq(pdev, 0);
        ret = devm_request_irq(&pdev->dev, irq, vpe_irq, 0, VPE_MODULE_NAME,
                        dev);
        if (ret)
                goto v4l2_dev_unreg;

        platform_set_drvdata(pdev, dev);

        dev->m2m_dev = v4l2_m2m_init(&m2m_ops);
        if (IS_ERR(dev->m2m_dev)) {
                vpe_err(dev, "Failed to init mem2mem device\n");
                ret = PTR_ERR(dev->m2m_dev);
                goto v4l2_dev_unreg;
        }

        pm_runtime_enable(&pdev->dev);

        ret = vpe_runtime_get(pdev);
        if (ret)
                goto rel_m2m;

        /* Perform clk enable followed by reset */
        vpe_set_clock_enable(dev, 1);

        vpe_top_reset(dev);

        func = read_field_reg(dev, VPE_PID, VPE_PID_FUNC_MASK,
                VPE_PID_FUNC_SHIFT);
        vpe_dbg(dev, "VPE PID function %x\n", func);

        vpe_top_vpdma_reset(dev);

        dev->sc = sc_create(pdev, "sc");
        if (IS_ERR(dev->sc)) {
                ret = PTR_ERR(dev->sc);
                goto runtime_put;
        }

        dev->csc = csc_create(pdev, "csc");
        if (IS_ERR(dev->csc)) {
                ret = PTR_ERR(dev->csc);
                goto runtime_put;
        }

        dev->vpdma = &dev->vpdma_data;
        ret = vpdma_create(pdev, dev->vpdma, vpe_fw_cb);
        if (ret)
                goto runtime_put;

        return 0;

runtime_put:
        vpe_runtime_put(pdev);
rel_m2m:
        pm_runtime_disable(&pdev->dev);
        v4l2_m2m_release(dev->m2m_dev);
v4l2_dev_unreg:
        v4l2_device_unregister(&dev->v4l2_dev);

        return ret;
}

static int vpe_remove(struct platform_device *pdev)
{
        struct vpe_dev *dev = platform_get_drvdata(pdev);

        v4l2_info(&dev->v4l2_dev, "Removing " VPE_MODULE_NAME);

        v4l2_m2m_release(dev->m2m_dev);
        video_unregister_device(&dev->vfd);
        v4l2_device_unregister(&dev->v4l2_dev);

        vpe_set_clock_enable(dev, 0);
        vpe_runtime_put(pdev);
        pm_runtime_disable(&pdev->dev);

        return 0;
}

#if defined(CONFIG_OF)
static const struct of_device_id vpe_of_match[] = {
        {
                .compatible = "ti,vpe",
        },
        {},
};
MODULE_DEVICE_TABLE(of, vpe_of_match);
#endif

static struct platform_driver vpe_pdrv = {
        .probe          = vpe_probe,
        .remove         = vpe_remove,
        .driver         = {
                .name   = VPE_MODULE_NAME,
                .of_match_table = of_match_ptr(vpe_of_match),
        },
};

module_platform_driver(vpe_pdrv);

MODULE_DESCRIPTION("TI VPE driver");
MODULE_AUTHOR("Dale Farnsworth, <dale@farnsworth.org>");
MODULE_LICENSE("GPL");