treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 157

[thirdparty/kernel/stable.git] / drivers / gpu / ipu-v3 / ipu-image-convert.c

// SPDX-License-Identifier: GPL-2.0-or-later
/*
 * Copyright (C) 2012-2016 Mentor Graphics Inc.
 *
 * Queued image conversion support, with tiling and rotation.
 */

#include <linux/interrupt.h>
#include <linux/dma-mapping.h>
#include <video/imx-ipu-image-convert.h>
#include "ipu-prv.h"

/*
 * The IC Resizer has a restriction that the output frame from the
 * resizer must be 1024 or less in both width (pixels) and height
 * (lines).
 *
 * The image converter attempts to split up a conversion when
 * the desired output (converted) frame resolution exceeds the
 * IC resizer limit of 1024 in either dimension.
 *
 * If either dimension of the output frame exceeds the limit, the
 * dimension is split into 1, 2, or 4 equal stripes, for a maximum
 * of 4*4 or 16 tiles. A conversion is then carried out for each
 * tile (but taking care to pass the full frame stride length to
 * the DMA channel's parameter memory!). IDMA double-buffering is used
 * to convert each tile back-to-back when possible (see note below
 * when double_buffering boolean is set).
 *
 * Note that the input frame must be split up into the same number
 * of tiles as the output frame:
 *
 *                       +---------+-----+
 *   +-----+---+         |  A      | B   |
 *   | A   | B |         |         |     |
 *   +-----+---+   -->   +---------+-----+
 *   | C   | D |         |  C      | D   |
 *   +-----+---+         |         |     |
 *                       +---------+-----+
 *
 * Clockwise 90° rotations are handled by first rescaling into a
 * reusable temporary tile buffer and then rotating with the 8x8
 * block rotator, writing to the correct destination:
 *
 *                                         +-----+-----+
 *                                         |     |     |
 *   +-----+---+         +---------+       | C   | A   |
 *   | A   | B |         | A,B, |  |       |     |     |
 *   +-----+---+   -->   | C,D  |  |  -->  |     |     |
 *   | C   | D |         +---------+       +-----+-----+
 *   +-----+---+                           | D   | B   |
 *                                         |     |     |
 *                                         +-----+-----+
 *
 * If the 8x8 block rotator is used, horizontal or vertical flipping
 * is done during the rotation step, otherwise flipping is done
 * during the scaling step.
 * With rotation or flipping, tile order changes between input and
 * output image. Tiles are numbered row major from top left to bottom
 * right for both input and output image.
 */

#define MAX_STRIPES_W    4
#define MAX_STRIPES_H    4
#define MAX_TILES (MAX_STRIPES_W * MAX_STRIPES_H)

#define MIN_W     16
#define MIN_H     8
#define MAX_W     4096
#define MAX_H     4096

enum ipu_image_convert_type {
        IMAGE_CONVERT_IN = 0,
        IMAGE_CONVERT_OUT,
};

struct ipu_image_convert_dma_buf {
        void          *virt;
        dma_addr_t    phys;
        unsigned long len;
};

struct ipu_image_convert_dma_chan {
        int in;
        int out;
        int rot_in;
        int rot_out;
        int vdi_in_p;
        int vdi_in;
        int vdi_in_n;
};

/* dimensions of one tile */
struct ipu_image_tile {
        u32 width;
        u32 height;
        u32 left;
        u32 top;
        /* size and strides are in bytes */
        u32 size;
        u32 stride;
        u32 rot_stride;
        /* start Y or packed offset of this tile */
        u32 offset;
        /* offset from start to tile in U plane, for planar formats */
        u32 u_off;
        /* offset from start to tile in V plane, for planar formats */
        u32 v_off;
};

struct ipu_image_convert_image {
        struct ipu_image base;
        enum ipu_image_convert_type type;

        const struct ipu_image_pixfmt *fmt;
        unsigned int stride;

        /* # of rows (horizontal stripes) if dest height is > 1024 */
        unsigned int num_rows;
        /* # of columns (vertical stripes) if dest width is > 1024 */
        unsigned int num_cols;

        struct ipu_image_tile tile[MAX_TILES];
};

struct ipu_image_pixfmt {
        u32     fourcc;        /* V4L2 fourcc */
        int     bpp;           /* total bpp */
        int     uv_width_dec;  /* decimation in width for U/V planes */
        int     uv_height_dec; /* decimation in height for U/V planes */
        bool    planar;        /* planar format */
        bool    uv_swapped;    /* U and V planes are swapped */
        bool    uv_packed;     /* partial planar (U and V in same plane) */
};

struct ipu_image_convert_ctx;
struct ipu_image_convert_chan;
struct ipu_image_convert_priv;

struct ipu_image_convert_ctx {
        struct ipu_image_convert_chan *chan;

        ipu_image_convert_cb_t complete;
        void *complete_context;

        /* Source/destination image data and rotation mode */
        struct ipu_image_convert_image in;
        struct ipu_image_convert_image out;
        enum ipu_rotate_mode rot_mode;
        u32 downsize_coeff_h;
        u32 downsize_coeff_v;
        u32 image_resize_coeff_h;
        u32 image_resize_coeff_v;
        u32 resize_coeffs_h[MAX_STRIPES_W];
        u32 resize_coeffs_v[MAX_STRIPES_H];

        /* intermediate buffer for rotation */
        struct ipu_image_convert_dma_buf rot_intermediate[2];

        /* current buffer number for double buffering */
        int cur_buf_num;

        bool aborting;
        struct completion aborted;

        /* can we use double-buffering for this conversion operation? */
        bool double_buffering;
        /* num_rows * num_cols */
        unsigned int num_tiles;
        /* next tile to process */
        unsigned int next_tile;
        /* where to place converted tile in dest image */
        unsigned int out_tile_map[MAX_TILES];

        struct list_head list;
};

struct ipu_image_convert_chan {
        struct ipu_image_convert_priv *priv;

        enum ipu_ic_task ic_task;
        const struct ipu_image_convert_dma_chan *dma_ch;

        struct ipu_ic *ic;
        struct ipuv3_channel *in_chan;
        struct ipuv3_channel *out_chan;
        struct ipuv3_channel *rotation_in_chan;
        struct ipuv3_channel *rotation_out_chan;

        /* the IPU end-of-frame irqs */
        int out_eof_irq;
        int rot_out_eof_irq;

        spinlock_t irqlock;

        /* list of convert contexts */
        struct list_head ctx_list;
        /* queue of conversion runs */
        struct list_head pending_q;
        /* queue of completed runs */
        struct list_head done_q;

        /* the current conversion run */
        struct ipu_image_convert_run *current_run;
};

struct ipu_image_convert_priv {
        struct ipu_image_convert_chan chan[IC_NUM_TASKS];
        struct ipu_soc *ipu;
};

static const struct ipu_image_convert_dma_chan
image_convert_dma_chan[IC_NUM_TASKS] = {
        [IC_TASK_VIEWFINDER] = {
                .in = IPUV3_CHANNEL_MEM_IC_PRP_VF,
                .out = IPUV3_CHANNEL_IC_PRP_VF_MEM,
                .rot_in = IPUV3_CHANNEL_MEM_ROT_VF,
                .rot_out = IPUV3_CHANNEL_ROT_VF_MEM,
                .vdi_in_p = IPUV3_CHANNEL_MEM_VDI_PREV,
                .vdi_in = IPUV3_CHANNEL_MEM_VDI_CUR,
                .vdi_in_n = IPUV3_CHANNEL_MEM_VDI_NEXT,
        },
        [IC_TASK_POST_PROCESSOR] = {
                .in = IPUV3_CHANNEL_MEM_IC_PP,
                .out = IPUV3_CHANNEL_IC_PP_MEM,
                .rot_in = IPUV3_CHANNEL_MEM_ROT_PP,
                .rot_out = IPUV3_CHANNEL_ROT_PP_MEM,
        },
};

static const struct ipu_image_pixfmt image_convert_formats[] = {
        {
                .fourcc = V4L2_PIX_FMT_RGB565,
                .bpp    = 16,
        }, {
                .fourcc = V4L2_PIX_FMT_RGB24,
                .bpp    = 24,
        }, {
                .fourcc = V4L2_PIX_FMT_BGR24,
                .bpp    = 24,
        }, {
                .fourcc = V4L2_PIX_FMT_RGB32,
                .bpp    = 32,
        }, {
                .fourcc = V4L2_PIX_FMT_BGR32,
                .bpp    = 32,
        }, {
                .fourcc = V4L2_PIX_FMT_XRGB32,
                .bpp    = 32,
        }, {
                .fourcc = V4L2_PIX_FMT_XBGR32,
                .bpp    = 32,
        }, {
                .fourcc = V4L2_PIX_FMT_YUYV,
                .bpp    = 16,
                .uv_width_dec = 2,
                .uv_height_dec = 1,
        }, {
                .fourcc = V4L2_PIX_FMT_UYVY,
                .bpp    = 16,
                .uv_width_dec = 2,
                .uv_height_dec = 1,
        }, {
                .fourcc = V4L2_PIX_FMT_YUV420,
                .bpp    = 12,
                .planar = true,
                .uv_width_dec = 2,
                .uv_height_dec = 2,
        }, {
                .fourcc = V4L2_PIX_FMT_YVU420,
                .bpp    = 12,
                .planar = true,
                .uv_width_dec = 2,
                .uv_height_dec = 2,
                .uv_swapped = true,
        }, {
                .fourcc = V4L2_PIX_FMT_NV12,
                .bpp    = 12,
                .planar = true,
                .uv_width_dec = 2,
                .uv_height_dec = 2,
                .uv_packed = true,
        }, {
                .fourcc = V4L2_PIX_FMT_YUV422P,
                .bpp    = 16,
                .planar = true,
                .uv_width_dec = 2,
                .uv_height_dec = 1,
        }, {
                .fourcc = V4L2_PIX_FMT_NV16,
                .bpp    = 16,
                .planar = true,
                .uv_width_dec = 2,
                .uv_height_dec = 1,
                .uv_packed = true,
        },
};

static const struct ipu_image_pixfmt *get_format(u32 fourcc)
{
        const struct ipu_image_pixfmt *ret = NULL;
        unsigned int i;

        for (i = 0; i < ARRAY_SIZE(image_convert_formats); i++) {
                if (image_convert_formats[i].fourcc == fourcc) {
                        ret = &image_convert_formats[i];
                        break;
                }
        }

        return ret;
}

static void dump_format(struct ipu_image_convert_ctx *ctx,
                        struct ipu_image_convert_image *ic_image)
{
        struct ipu_image_convert_chan *chan = ctx->chan;
        struct ipu_image_convert_priv *priv = chan->priv;

        dev_dbg(priv->ipu->dev,
                "task %u: ctx %p: %s format: %dx%d (%dx%d tiles), %c%c%c%c\n",
                chan->ic_task, ctx,
                ic_image->type == IMAGE_CONVERT_OUT ? "Output" : "Input",
                ic_image->base.pix.width, ic_image->base.pix.height,
                ic_image->num_cols, ic_image->num_rows,
                ic_image->fmt->fourcc & 0xff,
                (ic_image->fmt->fourcc >> 8) & 0xff,
                (ic_image->fmt->fourcc >> 16) & 0xff,
                (ic_image->fmt->fourcc >> 24) & 0xff);
}

int ipu_image_convert_enum_format(int index, u32 *fourcc)
{
        const struct ipu_image_pixfmt *fmt;

        if (index >= (int)ARRAY_SIZE(image_convert_formats))
                return -EINVAL;

        /* Format found */
        fmt = &image_convert_formats[index];
        *fourcc = fmt->fourcc;
        return 0;
}
EXPORT_SYMBOL_GPL(ipu_image_convert_enum_format);

static void free_dma_buf(struct ipu_image_convert_priv *priv,
                         struct ipu_image_convert_dma_buf *buf)
{
        if (buf->virt)
                dma_free_coherent(priv->ipu->dev,
                                  buf->len, buf->virt, buf->phys);
        buf->virt = NULL;
        buf->phys = 0;
}

static int alloc_dma_buf(struct ipu_image_convert_priv *priv,
                         struct ipu_image_convert_dma_buf *buf,
                         int size)
{
        buf->len = PAGE_ALIGN(size);
        buf->virt = dma_alloc_coherent(priv->ipu->dev, buf->len, &buf->phys,
                                       GFP_DMA | GFP_KERNEL);
        if (!buf->virt) {
                dev_err(priv->ipu->dev, "failed to alloc dma buffer\n");
                return -ENOMEM;
        }

        return 0;
}

static inline int num_stripes(int dim)
{
        return (dim - 1) / 1024 + 1;
}

/*
 * Calculate downsizing coefficients, which are the same for all tiles,
 * and bilinear resizing coefficients, which are used to find the best
 * seam positions.
 */
static int calc_image_resize_coefficients(struct ipu_image_convert_ctx *ctx,
                                          struct ipu_image *in,
                                          struct ipu_image *out)
{
        u32 downsized_width = in->rect.width;
        u32 downsized_height = in->rect.height;
        u32 downsize_coeff_v = 0;
        u32 downsize_coeff_h = 0;
        u32 resized_width = out->rect.width;
        u32 resized_height = out->rect.height;
        u32 resize_coeff_h;
        u32 resize_coeff_v;

        if (ipu_rot_mode_is_irt(ctx->rot_mode)) {
                resized_width = out->rect.height;
                resized_height = out->rect.width;
        }

        /* Do not let invalid input lead to an endless loop below */
        if (WARN_ON(resized_width == 0 || resized_height == 0))
                return -EINVAL;

        while (downsized_width >= resized_width * 2) {
                downsized_width >>= 1;
                downsize_coeff_h++;
        }

        while (downsized_height >= resized_height * 2) {
                downsized_height >>= 1;
                downsize_coeff_v++;
        }

        /*
         * Calculate the bilinear resizing coefficients that could be used if
         * we were converting with a single tile. The bottom right output pixel
         * should sample as close as possible to the bottom right input pixel
         * out of the decimator, but not overshoot it:
         */
        resize_coeff_h = 8192 * (downsized_width - 1) / (resized_width - 1);
        resize_coeff_v = 8192 * (downsized_height - 1) / (resized_height - 1);

        dev_dbg(ctx->chan->priv->ipu->dev,
                "%s: hscale: >>%u, *8192/%u vscale: >>%u, *8192/%u, %ux%u tiles\n",
                __func__, downsize_coeff_h, resize_coeff_h, downsize_coeff_v,
                resize_coeff_v, ctx->in.num_cols, ctx->in.num_rows);

        if (downsize_coeff_h > 2 || downsize_coeff_v  > 2 ||
            resize_coeff_h > 0x3fff || resize_coeff_v > 0x3fff)
                return -EINVAL;

        ctx->downsize_coeff_h = downsize_coeff_h;
        ctx->downsize_coeff_v = downsize_coeff_v;
        ctx->image_resize_coeff_h = resize_coeff_h;
        ctx->image_resize_coeff_v = resize_coeff_v;

        return 0;
}

#define round_closest(x, y) round_down((x) + (y)/2, (y))

/*
 * Find the best aligned seam position in the inverval [out_start, out_end].
 * Rotation and image offsets are out of scope.
 *
 * @out_start: start of inverval, must be within 1024 pixels / lines
 *             of out_end
 * @out_end: end of interval, smaller than or equal to out_edge
 * @in_edge: input right / bottom edge
 * @out_edge: output right / bottom edge
 * @in_align: input alignment, either horizontal 8-byte line start address
 *            alignment, or pixel alignment due to image format
 * @out_align: output alignment, either horizontal 8-byte line start address
 *             alignment, or pixel alignment due to image format or rotator
 *             block size
 * @in_burst: horizontal input burst size in case of horizontal flip
 * @out_burst: horizontal output burst size or rotator block size
 * @downsize_coeff: downsizing section coefficient
 * @resize_coeff: main processing section resizing coefficient
 * @_in_seam: aligned input seam position return value
 * @_out_seam: aligned output seam position return value
 */
static void find_best_seam(struct ipu_image_convert_ctx *ctx,
                           unsigned int out_start,
                           unsigned int out_end,
                           unsigned int in_edge,
                           unsigned int out_edge,
                           unsigned int in_align,
                           unsigned int out_align,
                           unsigned int in_burst,
                           unsigned int out_burst,
                           unsigned int downsize_coeff,
                           unsigned int resize_coeff,
                           u32 *_in_seam,
                           u32 *_out_seam)
{
        struct device *dev = ctx->chan->priv->ipu->dev;
        unsigned int out_pos;
        /* Input / output seam position candidates */
        unsigned int out_seam = 0;
        unsigned int in_seam = 0;
        unsigned int min_diff = UINT_MAX;

        /*
         * Output tiles must start at a multiple of 8 bytes horizontally and
         * possibly at an even line horizontally depending on the pixel format.
         * Only consider output aligned positions for the seam.
         */
        out_start = round_up(out_start, out_align);
        for (out_pos = out_start; out_pos < out_end; out_pos += out_align) {
                unsigned int in_pos;
                unsigned int in_pos_aligned;
                unsigned int abs_diff;

                /*
                 * Tiles in the right row / bottom column may not be allowed to
                 * overshoot horizontally / vertically. out_burst may be the
                 * actual DMA burst size, or the rotator block size.
                 */
                if ((out_burst > 1) && (out_edge - out_pos) % out_burst)
                        continue;

                /*
                 * Input sample position, corresponding to out_pos, 19.13 fixed
                 * point.
                 */
                in_pos = (out_pos * resize_coeff) << downsize_coeff;
                /*
                 * The closest input sample position that we could actually
                 * start the input tile at, 19.13 fixed point.
                 */
                in_pos_aligned = round_closest(in_pos, 8192U * in_align);

                if ((in_burst > 1) &&
                    (in_edge - in_pos_aligned / 8192U) % in_burst)
                        continue;

                if (in_pos < in_pos_aligned)
                        abs_diff = in_pos_aligned - in_pos;
                else
                        abs_diff = in_pos - in_pos_aligned;

                if (abs_diff < min_diff) {
                        in_seam = in_pos_aligned;
                        out_seam = out_pos;
                        min_diff = abs_diff;
                }
        }

        *_out_seam = out_seam;
        /* Convert 19.13 fixed point to integer seam position */
        *_in_seam = DIV_ROUND_CLOSEST(in_seam, 8192U);

        dev_dbg(dev, "%s: out_seam %u(%u) in [%u, %u], in_seam %u(%u) diff %u.%03u\n",
                __func__, out_seam, out_align, out_start, out_end,
                *_in_seam, in_align, min_diff / 8192,
                DIV_ROUND_CLOSEST(min_diff % 8192 * 1000, 8192));
}

/*
 * Tile left edges are required to be aligned to multiples of 8 bytes
 * by the IDMAC.
 */
static inline u32 tile_left_align(const struct ipu_image_pixfmt *fmt)
{
        if (fmt->planar)
                return fmt->uv_packed ? 8 : 8 * fmt->uv_width_dec;
        else
                return fmt->bpp == 32 ? 2 : fmt->bpp == 16 ? 4 : 8;
}

/*
 * Tile top edge alignment is only limited by chroma subsampling.
 */
static inline u32 tile_top_align(const struct ipu_image_pixfmt *fmt)
{
        return fmt->uv_height_dec > 1 ? 2 : 1;
}

static inline u32 tile_width_align(enum ipu_image_convert_type type,
                                   const struct ipu_image_pixfmt *fmt,
                                   enum ipu_rotate_mode rot_mode)
{
        if (type == IMAGE_CONVERT_IN) {
                /*
                 * The IC burst reads 8 pixels at a time. Reading beyond the
                 * end of the line is usually acceptable. Those pixels are
                 * ignored, unless the IC has to write the scaled line in
                 * reverse.
                 */
                return (!ipu_rot_mode_is_irt(rot_mode) &&
                        (rot_mode & IPU_ROT_BIT_HFLIP)) ? 8 : 2;
        }

        /*
         * Align to 16x16 pixel blocks for planar 4:2:0 chroma subsampled
         * formats to guarantee 8-byte aligned line start addresses in the
         * chroma planes when IRT is used. Align to 8x8 pixel IRT block size
         * for all other formats.
         */
        return (ipu_rot_mode_is_irt(rot_mode) &&
                fmt->planar && !fmt->uv_packed) ?
                8 * fmt->uv_width_dec : 8;
}

static inline u32 tile_height_align(enum ipu_image_convert_type type,
                                    const struct ipu_image_pixfmt *fmt,
                                    enum ipu_rotate_mode rot_mode)
{
        if (type == IMAGE_CONVERT_IN || !ipu_rot_mode_is_irt(rot_mode))
                return 2;

        /*
         * Align to 16x16 pixel blocks for planar 4:2:0 chroma subsampled
         * formats to guarantee 8-byte aligned line start addresses in the
         * chroma planes when IRT is used. Align to 8x8 pixel IRT block size
         * for all other formats.
         */
        return (fmt->planar && !fmt->uv_packed) ? 8 * fmt->uv_width_dec : 8;
}

/*
 * Fill in left position and width and for all tiles in an input column, and
 * for all corresponding output tiles. If the 90° rotator is used, the output
 * tiles are in a row, and output tile top position and height are set.
 */
static void fill_tile_column(struct ipu_image_convert_ctx *ctx,
                             unsigned int col,
                             struct ipu_image_convert_image *in,
                             unsigned int in_left, unsigned int in_width,
                             struct ipu_image_convert_image *out,
                             unsigned int out_left, unsigned int out_width)
{
        unsigned int row, tile_idx;
        struct ipu_image_tile *in_tile, *out_tile;

        for (row = 0; row < in->num_rows; row++) {
                tile_idx = in->num_cols * row + col;
                in_tile = &in->tile[tile_idx];
                out_tile = &out->tile[ctx->out_tile_map[tile_idx]];

                in_tile->left = in_left;
                in_tile->width = in_width;

                if (ipu_rot_mode_is_irt(ctx->rot_mode)) {
                        out_tile->top = out_left;
                        out_tile->height = out_width;
                } else {
                        out_tile->left = out_left;
                        out_tile->width = out_width;
                }
        }
}

/*
 * Fill in top position and height and for all tiles in an input row, and
 * for all corresponding output tiles. If the 90° rotator is used, the output
 * tiles are in a column, and output tile left position and width are set.
 */
static void fill_tile_row(struct ipu_image_convert_ctx *ctx, unsigned int row,
                          struct ipu_image_convert_image *in,
                          unsigned int in_top, unsigned int in_height,
                          struct ipu_image_convert_image *out,
                          unsigned int out_top, unsigned int out_height)
{
        unsigned int col, tile_idx;
        struct ipu_image_tile *in_tile, *out_tile;

        for (col = 0; col < in->num_cols; col++) {
                tile_idx = in->num_cols * row + col;
                in_tile = &in->tile[tile_idx];
                out_tile = &out->tile[ctx->out_tile_map[tile_idx]];

                in_tile->top = in_top;
                in_tile->height = in_height;

                if (ipu_rot_mode_is_irt(ctx->rot_mode)) {
                        out_tile->left = out_top;
                        out_tile->width = out_height;
                } else {
                        out_tile->top = out_top;
                        out_tile->height = out_height;
                }
        }
}

/*
 * Find the best horizontal and vertical seam positions to split into tiles.
 * Minimize the fractional part of the input sampling position for the
 * top / left pixels of each tile.
 */
static void find_seams(struct ipu_image_convert_ctx *ctx,
                       struct ipu_image_convert_image *in,
                       struct ipu_image_convert_image *out)
{
        struct device *dev = ctx->chan->priv->ipu->dev;
        unsigned int resized_width = out->base.rect.width;
        unsigned int resized_height = out->base.rect.height;
        unsigned int col;
        unsigned int row;
        unsigned int in_left_align = tile_left_align(in->fmt);
        unsigned int in_top_align = tile_top_align(in->fmt);
        unsigned int out_left_align = tile_left_align(out->fmt);
        unsigned int out_top_align = tile_top_align(out->fmt);
        unsigned int out_width_align = tile_width_align(out->type, out->fmt,
                                                        ctx->rot_mode);
        unsigned int out_height_align = tile_height_align(out->type, out->fmt,
                                                          ctx->rot_mode);
        unsigned int in_right = in->base.rect.width;
        unsigned int in_bottom = in->base.rect.height;
        unsigned int out_right = out->base.rect.width;
        unsigned int out_bottom = out->base.rect.height;
        unsigned int flipped_out_left;
        unsigned int flipped_out_top;

        if (ipu_rot_mode_is_irt(ctx->rot_mode)) {
                /* Switch width/height and align top left to IRT block size */
                resized_width = out->base.rect.height;
                resized_height = out->base.rect.width;
                out_left_align = out_height_align;
                out_top_align = out_width_align;
                out_width_align = out_left_align;
                out_height_align = out_top_align;
                out_right = out->base.rect.height;
                out_bottom = out->base.rect.width;
        }

        for (col = in->num_cols - 1; col > 0; col--) {
                bool allow_in_overshoot = ipu_rot_mode_is_irt(ctx->rot_mode) ||
                                          !(ctx->rot_mode & IPU_ROT_BIT_HFLIP);
                bool allow_out_overshoot = (col < in->num_cols - 1) &&
                                           !(ctx->rot_mode & IPU_ROT_BIT_HFLIP);
                unsigned int out_start;
                unsigned int out_end;
                unsigned int in_left;
                unsigned int out_left;

                /*
                 * Align input width to burst length if the scaling step flips
                 * horizontally.
                 */

                /* Start within 1024 pixels of the right edge */
                out_start = max_t(int, 0, out_right - 1024);
                /* End before having to add more columns to the left */
                out_end = min_t(unsigned int, out_right, col * 1024);

                find_best_seam(ctx, out_start, out_end,
                               in_right, out_right,
                               in_left_align, out_left_align,
                               allow_in_overshoot ? 1 : 8 /* burst length */,
                               allow_out_overshoot ? 1 : out_width_align,
                               ctx->downsize_coeff_h, ctx->image_resize_coeff_h,
                               &in_left, &out_left);

                if (ctx->rot_mode & IPU_ROT_BIT_HFLIP)
                        flipped_out_left = resized_width - out_right;
                else
                        flipped_out_left = out_left;

                fill_tile_column(ctx, col, in, in_left, in_right - in_left,
                                 out, flipped_out_left, out_right - out_left);

                dev_dbg(dev, "%s: col %u: %u, %u -> %u, %u\n", __func__, col,
                        in_left, in_right - in_left,
                        flipped_out_left, out_right - out_left);

                in_right = in_left;
                out_right = out_left;
        }

        flipped_out_left = (ctx->rot_mode & IPU_ROT_BIT_HFLIP) ?
                           resized_width - out_right : 0;

        fill_tile_column(ctx, 0, in, 0, in_right,
                         out, flipped_out_left, out_right);

        dev_dbg(dev, "%s: col 0: 0, %u -> %u, %u\n", __func__,
                in_right, flipped_out_left, out_right);

        for (row = in->num_rows - 1; row > 0; row--) {
                bool allow_overshoot = row < in->num_rows - 1;
                unsigned int out_start;
                unsigned int out_end;
                unsigned int in_top;
                unsigned int out_top;

                /* Start within 1024 lines of the bottom edge */
                out_start = max_t(int, 0, out_bottom - 1024);
                /* End before having to add more rows above */
                out_end = min_t(unsigned int, out_bottom, row * 1024);

                find_best_seam(ctx, out_start, out_end,
                               in_bottom, out_bottom,
                               in_top_align, out_top_align,
                               1, allow_overshoot ? 1 : out_height_align,
                               ctx->downsize_coeff_v, ctx->image_resize_coeff_v,
                               &in_top, &out_top);

                if ((ctx->rot_mode & IPU_ROT_BIT_VFLIP) ^
                    ipu_rot_mode_is_irt(ctx->rot_mode))
                        flipped_out_top = resized_height - out_bottom;
                else
                        flipped_out_top = out_top;

                fill_tile_row(ctx, row, in, in_top, in_bottom - in_top,
                              out, flipped_out_top, out_bottom - out_top);

                dev_dbg(dev, "%s: row %u: %u, %u -> %u, %u\n", __func__, row,
                        in_top, in_bottom - in_top,
                        flipped_out_top, out_bottom - out_top);

                in_bottom = in_top;
                out_bottom = out_top;
        }

        if ((ctx->rot_mode & IPU_ROT_BIT_VFLIP) ^
            ipu_rot_mode_is_irt(ctx->rot_mode))
                flipped_out_top = resized_height - out_bottom;
        else
                flipped_out_top = 0;

        fill_tile_row(ctx, 0, in, 0, in_bottom,
                      out, flipped_out_top, out_bottom);

        dev_dbg(dev, "%s: row 0: 0, %u -> %u, %u\n", __func__,
                in_bottom, flipped_out_top, out_bottom);
}

static void calc_tile_dimensions(struct ipu_image_convert_ctx *ctx,
                                 struct ipu_image_convert_image *image)
{
        struct ipu_image_convert_chan *chan = ctx->chan;
        struct ipu_image_convert_priv *priv = chan->priv;
        unsigned int i;

        for (i = 0; i < ctx->num_tiles; i++) {
                struct ipu_image_tile *tile;
                const unsigned int row = i / image->num_cols;
                const unsigned int col = i % image->num_cols;

                if (image->type == IMAGE_CONVERT_OUT)
                        tile = &image->tile[ctx->out_tile_map[i]];
                else
                        tile = &image->tile[i];

                tile->size = ((tile->height * image->fmt->bpp) >> 3) *
                        tile->width;

                if (image->fmt->planar) {
                        tile->stride = tile->width;
                        tile->rot_stride = tile->height;
                } else {
                        tile->stride =
                                (image->fmt->bpp * tile->width) >> 3;
                        tile->rot_stride =
                                (image->fmt->bpp * tile->height) >> 3;
                }

                dev_dbg(priv->ipu->dev,
                        "task %u: ctx %p: %s@[%u,%u]: %ux%u@%u,%u\n",
                        chan->ic_task, ctx,
                        image->type == IMAGE_CONVERT_IN ? "Input" : "Output",
                        row, col,
                        tile->width, tile->height, tile->left, tile->top);
        }
}

/*
 * Use the rotation transformation to find the tile coordinates
 * (row, col) of a tile in the destination frame that corresponds
 * to the given tile coordinates of a source frame. The destination
 * coordinate is then converted to a tile index.
 */
static int transform_tile_index(struct ipu_image_convert_ctx *ctx,
                                int src_row, int src_col)
{
        struct ipu_image_convert_chan *chan = ctx->chan;
        struct ipu_image_convert_priv *priv = chan->priv;
        struct ipu_image_convert_image *s_image = &ctx->in;
        struct ipu_image_convert_image *d_image = &ctx->out;
        int dst_row, dst_col;

        /* with no rotation it's a 1:1 mapping */
        if (ctx->rot_mode == IPU_ROTATE_NONE)
                return src_row * s_image->num_cols + src_col;

        /*
         * before doing the transform, first we have to translate
         * source row,col for an origin in the center of s_image
         */
        src_row = src_row * 2 - (s_image->num_rows - 1);
        src_col = src_col * 2 - (s_image->num_cols - 1);

        /* do the rotation transform */
        if (ctx->rot_mode & IPU_ROT_BIT_90) {
                dst_col = -src_row;
                dst_row = src_col;
        } else {
                dst_col = src_col;
                dst_row = src_row;
        }

        /* apply flip */
        if (ctx->rot_mode & IPU_ROT_BIT_HFLIP)
                dst_col = -dst_col;
        if (ctx->rot_mode & IPU_ROT_BIT_VFLIP)
                dst_row = -dst_row;

        dev_dbg(priv->ipu->dev, "task %u: ctx %p: [%d,%d] --> [%d,%d]\n",
                chan->ic_task, ctx, src_col, src_row, dst_col, dst_row);

        /*
         * finally translate dest row,col using an origin in upper
         * left of d_image
         */
        dst_row += d_image->num_rows - 1;
        dst_col += d_image->num_cols - 1;
        dst_row /= 2;
        dst_col /= 2;

        return dst_row * d_image->num_cols + dst_col;
}

/*
 * Fill the out_tile_map[] with transformed destination tile indeces.
 */
static void calc_out_tile_map(struct ipu_image_convert_ctx *ctx)
{
        struct ipu_image_convert_image *s_image = &ctx->in;
        unsigned int row, col, tile = 0;

        for (row = 0; row < s_image->num_rows; row++) {
                for (col = 0; col < s_image->num_cols; col++) {
                        ctx->out_tile_map[tile] =
                                transform_tile_index(ctx, row, col);
                        tile++;
                }
        }
}

static int calc_tile_offsets_planar(struct ipu_image_convert_ctx *ctx,
                                    struct ipu_image_convert_image *image)
{
        struct ipu_image_convert_chan *chan = ctx->chan;
        struct ipu_image_convert_priv *priv = chan->priv;
        const struct ipu_image_pixfmt *fmt = image->fmt;
        unsigned int row, col, tile = 0;
        u32 H, top, y_stride, uv_stride;
        u32 uv_row_off, uv_col_off, uv_off, u_off, v_off, tmp;
        u32 y_row_off, y_col_off, y_off;
        u32 y_size, uv_size;

        /* setup some convenience vars */
        H = image->base.pix.height;

        y_stride = image->stride;
        uv_stride = y_stride / fmt->uv_width_dec;
        if (fmt->uv_packed)
                uv_stride *= 2;

        y_size = H * y_stride;
        uv_size = y_size / (fmt->uv_width_dec * fmt->uv_height_dec);

        for (row = 0; row < image->num_rows; row++) {
                top = image->tile[tile].top;
                y_row_off = top * y_stride;
                uv_row_off = (top * uv_stride) / fmt->uv_height_dec;

                for (col = 0; col < image->num_cols; col++) {
                        y_col_off = image->tile[tile].left;
                        uv_col_off = y_col_off / fmt->uv_width_dec;
                        if (fmt->uv_packed)
                                uv_col_off *= 2;

                        y_off = y_row_off + y_col_off;
                        uv_off = uv_row_off + uv_col_off;

                        u_off = y_size - y_off + uv_off;
                        v_off = (fmt->uv_packed) ? 0 : u_off + uv_size;
                        if (fmt->uv_swapped) {
                                tmp = u_off;
                                u_off = v_off;
                                v_off = tmp;
                        }

                        image->tile[tile].offset = y_off;
                        image->tile[tile].u_off = u_off;
                        image->tile[tile++].v_off = v_off;

                        if ((y_off & 0x7) || (u_off & 0x7) || (v_off & 0x7)) {
                                dev_err(priv->ipu->dev,
                                        "task %u: ctx %p: %s@[%d,%d]: "
                                        "y_off %08x, u_off %08x, v_off %08x\n",
                                        chan->ic_task, ctx,
                                        image->type == IMAGE_CONVERT_IN ?
                                        "Input" : "Output", row, col,
                                        y_off, u_off, v_off);
                                return -EINVAL;
                        }
                }
        }

        return 0;
}

static int calc_tile_offsets_packed(struct ipu_image_convert_ctx *ctx,
                                    struct ipu_image_convert_image *image)
{
        struct ipu_image_convert_chan *chan = ctx->chan;
        struct ipu_image_convert_priv *priv = chan->priv;
        const struct ipu_image_pixfmt *fmt = image->fmt;
        unsigned int row, col, tile = 0;
        u32 bpp, stride, offset;
        u32 row_off, col_off;

        /* setup some convenience vars */
        stride = image->stride;
        bpp = fmt->bpp;

        for (row = 0; row < image->num_rows; row++) {
                row_off = image->tile[tile].top * stride;

                for (col = 0; col < image->num_cols; col++) {
                        col_off = (image->tile[tile].left * bpp) >> 3;

                        offset = row_off + col_off;

                        image->tile[tile].offset = offset;
                        image->tile[tile].u_off = 0;
                        image->tile[tile++].v_off = 0;

                        if (offset & 0x7) {
                                dev_err(priv->ipu->dev,
                                        "task %u: ctx %p: %s@[%d,%d]: "
                                        "phys %08x\n",
                                        chan->ic_task, ctx,
                                        image->type == IMAGE_CONVERT_IN ?
                                        "Input" : "Output", row, col,
                                        row_off + col_off);
                                return -EINVAL;
                        }
                }
        }

        return 0;
}

static int calc_tile_offsets(struct ipu_image_convert_ctx *ctx,
                              struct ipu_image_convert_image *image)
{
        if (image->fmt->planar)
                return calc_tile_offsets_planar(ctx, image);

        return calc_tile_offsets_packed(ctx, image);
}

/*
 * Calculate the resizing ratio for the IC main processing section given input
 * size, fixed downsizing coefficient, and output size.
 * Either round to closest for the next tile's first pixel to minimize seams
 * and distortion (for all but right column / bottom row), or round down to
 * avoid sampling beyond the edges of the input image for this tile's last
 * pixel.
 * Returns the resizing coefficient, resizing ratio is 8192.0 / resize_coeff.
 */
static u32 calc_resize_coeff(u32 input_size, u32 downsize_coeff,
                             u32 output_size, bool allow_overshoot)
{
        u32 downsized = input_size >> downsize_coeff;

        if (allow_overshoot)
                return DIV_ROUND_CLOSEST(8192 * downsized, output_size);
        else
                return 8192 * (downsized - 1) / (output_size - 1);
}

/*
 * Slightly modify resize coefficients per tile to hide the bilinear
 * interpolator reset at tile borders, shifting the right / bottom edge
 * by up to a half input pixel. This removes noticeable seams between
 * tiles at higher upscaling factors.
 */
static void calc_tile_resize_coefficients(struct ipu_image_convert_ctx *ctx)
{
        struct ipu_image_convert_chan *chan = ctx->chan;
        struct ipu_image_convert_priv *priv = chan->priv;
        struct ipu_image_tile *in_tile, *out_tile;
        unsigned int col, row, tile_idx;
        unsigned int last_output;

        for (col = 0; col < ctx->in.num_cols; col++) {
                bool closest = (col < ctx->in.num_cols - 1) &&
                               !(ctx->rot_mode & IPU_ROT_BIT_HFLIP);
                u32 resized_width;
                u32 resize_coeff_h;

                tile_idx = col;
                in_tile = &ctx->in.tile[tile_idx];
                out_tile = &ctx->out.tile[ctx->out_tile_map[tile_idx]];

                if (ipu_rot_mode_is_irt(ctx->rot_mode))
                        resized_width = out_tile->height;
                else
                        resized_width = out_tile->width;

                resize_coeff_h = calc_resize_coeff(in_tile->width,
                                                   ctx->downsize_coeff_h,
                                                   resized_width, closest);

                dev_dbg(priv->ipu->dev, "%s: column %u hscale: *8192/%u\n",
                        __func__, col, resize_coeff_h);


                for (row = 0; row < ctx->in.num_rows; row++) {
                        tile_idx = row * ctx->in.num_cols + col;
                        in_tile = &ctx->in.tile[tile_idx];
                        out_tile = &ctx->out.tile[ctx->out_tile_map[tile_idx]];

                        /*
                         * With the horizontal scaling factor known, round up
                         * resized width (output width or height) to burst size.
                         */
                        if (ipu_rot_mode_is_irt(ctx->rot_mode))
                                out_tile->height = round_up(resized_width, 8);
                        else
                                out_tile->width = round_up(resized_width, 8);

                        /*
                         * Calculate input width from the last accessed input
                         * pixel given resized width and scaling coefficients.
                         * Round up to burst size.
                         */
                        last_output = round_up(resized_width, 8) - 1;
                        if (closest)
                                last_output++;
                        in_tile->width = round_up(
                                (DIV_ROUND_UP(last_output * resize_coeff_h,
                                              8192) + 1)
                                << ctx->downsize_coeff_h, 8);
                }

                ctx->resize_coeffs_h[col] = resize_coeff_h;
        }

        for (row = 0; row < ctx->in.num_rows; row++) {
                bool closest = (row < ctx->in.num_rows - 1) &&
                               !(ctx->rot_mode & IPU_ROT_BIT_VFLIP);
                u32 resized_height;
                u32 resize_coeff_v;

                tile_idx = row * ctx->in.num_cols;
                in_tile = &ctx->in.tile[tile_idx];
                out_tile = &ctx->out.tile[ctx->out_tile_map[tile_idx]];

                if (ipu_rot_mode_is_irt(ctx->rot_mode))
                        resized_height = out_tile->width;
                else
                        resized_height = out_tile->height;

                resize_coeff_v = calc_resize_coeff(in_tile->height,
                                                   ctx->downsize_coeff_v,
                                                   resized_height, closest);

                dev_dbg(priv->ipu->dev, "%s: row %u vscale: *8192/%u\n",
                        __func__, row, resize_coeff_v);

                for (col = 0; col < ctx->in.num_cols; col++) {
                        tile_idx = row * ctx->in.num_cols + col;
                        in_tile = &ctx->in.tile[tile_idx];
                        out_tile = &ctx->out.tile[ctx->out_tile_map[tile_idx]];

                        /*
                         * With the vertical scaling factor known, round up
                         * resized height (output width or height) to IDMAC
                         * limitations.
                         */
                        if (ipu_rot_mode_is_irt(ctx->rot_mode))
                                out_tile->width = round_up(resized_height, 2);
                        else
                                out_tile->height = round_up(resized_height, 2);

                        /*
                         * Calculate input width from the last accessed input
                         * pixel given resized height and scaling coefficients.
                         * Align to IDMAC restrictions.
                         */
                        last_output = round_up(resized_height, 2) - 1;
                        if (closest)
                                last_output++;
                        in_tile->height = round_up(
                                (DIV_ROUND_UP(last_output * resize_coeff_v,
                                              8192) + 1)
                                << ctx->downsize_coeff_v, 2);
                }

                ctx->resize_coeffs_v[row] = resize_coeff_v;
        }
}

/*
 * return the number of runs in given queue (pending_q or done_q)
 * for this context. hold irqlock when calling.
 */
static int get_run_count(struct ipu_image_convert_ctx *ctx,
                         struct list_head *q)
{
        struct ipu_image_convert_run *run;
        int count = 0;

        lockdep_assert_held(&ctx->chan->irqlock);

        list_for_each_entry(run, q, list) {
                if (run->ctx == ctx)
                        count++;
        }

        return count;
}

static void convert_stop(struct ipu_image_convert_run *run)
{
        struct ipu_image_convert_ctx *ctx = run->ctx;
        struct ipu_image_convert_chan *chan = ctx->chan;
        struct ipu_image_convert_priv *priv = chan->priv;

        dev_dbg(priv->ipu->dev, "%s: task %u: stopping ctx %p run %p\n",
                __func__, chan->ic_task, ctx, run);

        /* disable IC tasks and the channels */
        ipu_ic_task_disable(chan->ic);
        ipu_idmac_disable_channel(chan->in_chan);
        ipu_idmac_disable_channel(chan->out_chan);

        if (ipu_rot_mode_is_irt(ctx->rot_mode)) {
                ipu_idmac_disable_channel(chan->rotation_in_chan);
                ipu_idmac_disable_channel(chan->rotation_out_chan);
                ipu_idmac_unlink(chan->out_chan, chan->rotation_in_chan);
        }

        ipu_ic_disable(chan->ic);
}

static void init_idmac_channel(struct ipu_image_convert_ctx *ctx,
                               struct ipuv3_channel *channel,
                               struct ipu_image_convert_image *image,
                               enum ipu_rotate_mode rot_mode,
                               bool rot_swap_width_height,
                               unsigned int tile)
{
        struct ipu_image_convert_chan *chan = ctx->chan;
        unsigned int burst_size;
        u32 width, height, stride;
        dma_addr_t addr0, addr1 = 0;
        struct ipu_image tile_image;
        unsigned int tile_idx[2];

        if (image->type == IMAGE_CONVERT_OUT) {
                tile_idx[0] = ctx->out_tile_map[tile];
                tile_idx[1] = ctx->out_tile_map[1];
        } else {
                tile_idx[0] = tile;
                tile_idx[1] = 1;
        }

        if (rot_swap_width_height) {
                width = image->tile[tile_idx[0]].height;
                height = image->tile[tile_idx[0]].width;
                stride = image->tile[tile_idx[0]].rot_stride;
                addr0 = ctx->rot_intermediate[0].phys;
                if (ctx->double_buffering)
                        addr1 = ctx->rot_intermediate[1].phys;
        } else {
                width = image->tile[tile_idx[0]].width;
                height = image->tile[tile_idx[0]].height;
                stride = image->stride;
                addr0 = image->base.phys0 +
                        image->tile[tile_idx[0]].offset;
                if (ctx->double_buffering)
                        addr1 = image->base.phys0 +
                                image->tile[tile_idx[1]].offset;
        }

        ipu_cpmem_zero(channel);

        memset(&tile_image, 0, sizeof(tile_image));
        tile_image.pix.width = tile_image.rect.width = width;
        tile_image.pix.height = tile_image.rect.height = height;
        tile_image.pix.bytesperline = stride;
        tile_image.pix.pixelformat =  image->fmt->fourcc;
        tile_image.phys0 = addr0;
        tile_image.phys1 = addr1;
        if (image->fmt->planar && !rot_swap_width_height) {
                tile_image.u_offset = image->tile[tile_idx[0]].u_off;
                tile_image.v_offset = image->tile[tile_idx[0]].v_off;
        }

        ipu_cpmem_set_image(channel, &tile_image);

        if (rot_mode)
                ipu_cpmem_set_rotation(channel, rot_mode);

        if (channel == chan->rotation_in_chan ||
            channel == chan->rotation_out_chan) {
                burst_size = 8;
                ipu_cpmem_set_block_mode(channel);
        } else
                burst_size = (width % 16) ? 8 : 16;

        ipu_cpmem_set_burstsize(channel, burst_size);

        ipu_ic_task_idma_init(chan->ic, channel, width, height,
                              burst_size, rot_mode);

        /*
         * Setting a non-zero AXI ID collides with the PRG AXI snooping, so
         * only do this when there is no PRG present.
         */
        if (!channel->ipu->prg_priv)
                ipu_cpmem_set_axi_id(channel, 1);

        ipu_idmac_set_double_buffer(channel, ctx->double_buffering);
}

static int convert_start(struct ipu_image_convert_run *run, unsigned int tile)
{
        struct ipu_image_convert_ctx *ctx = run->ctx;
        struct ipu_image_convert_chan *chan = ctx->chan;
        struct ipu_image_convert_priv *priv = chan->priv;
        struct ipu_image_convert_image *s_image = &ctx->in;
        struct ipu_image_convert_image *d_image = &ctx->out;
        enum ipu_color_space src_cs, dest_cs;
        unsigned int dst_tile = ctx->out_tile_map[tile];
        unsigned int dest_width, dest_height;
        unsigned int col, row;
        u32 rsc;
        int ret;

        dev_dbg(priv->ipu->dev, "%s: task %u: starting ctx %p run %p tile %u -> %u\n",
                __func__, chan->ic_task, ctx, run, tile, dst_tile);

        src_cs = ipu_pixelformat_to_colorspace(s_image->fmt->fourcc);
        dest_cs = ipu_pixelformat_to_colorspace(d_image->fmt->fourcc);

        if (ipu_rot_mode_is_irt(ctx->rot_mode)) {
                /* swap width/height for resizer */
                dest_width = d_image->tile[dst_tile].height;
                dest_height = d_image->tile[dst_tile].width;
        } else {
                dest_width = d_image->tile[dst_tile].width;
                dest_height = d_image->tile[dst_tile].height;
        }

        row = tile / s_image->num_cols;
        col = tile % s_image->num_cols;

        rsc =  (ctx->downsize_coeff_v << 30) |
               (ctx->resize_coeffs_v[row] << 16) |
               (ctx->downsize_coeff_h << 14) |
               (ctx->resize_coeffs_h[col]);

        dev_dbg(priv->ipu->dev, "%s: %ux%u -> %ux%u (rsc = 0x%x)\n",
                __func__, s_image->tile[tile].width,
                s_image->tile[tile].height, dest_width, dest_height, rsc);

        /* setup the IC resizer and CSC */
        ret = ipu_ic_task_init_rsc(chan->ic,
                               s_image->tile[tile].width,
                               s_image->tile[tile].height,
                               dest_width,
                               dest_height,
                               src_cs, dest_cs,
                               rsc);
        if (ret) {
                dev_err(priv->ipu->dev, "ipu_ic_task_init failed, %d\n", ret);
                return ret;
        }

        /* init the source MEM-->IC PP IDMAC channel */
        init_idmac_channel(ctx, chan->in_chan, s_image,
                           IPU_ROTATE_NONE, false, tile);

        if (ipu_rot_mode_is_irt(ctx->rot_mode)) {
                /* init the IC PP-->MEM IDMAC channel */
                init_idmac_channel(ctx, chan->out_chan, d_image,
                                   IPU_ROTATE_NONE, true, tile);

                /* init the MEM-->IC PP ROT IDMAC channel */
                init_idmac_channel(ctx, chan->rotation_in_chan, d_image,
                                   ctx->rot_mode, true, tile);

                /* init the destination IC PP ROT-->MEM IDMAC channel */
                init_idmac_channel(ctx, chan->rotation_out_chan, d_image,
                                   IPU_ROTATE_NONE, false, tile);

                /* now link IC PP-->MEM to MEM-->IC PP ROT */
                ipu_idmac_link(chan->out_chan, chan->rotation_in_chan);
        } else {
                /* init the destination IC PP-->MEM IDMAC channel */
                init_idmac_channel(ctx, chan->out_chan, d_image,
                                   ctx->rot_mode, false, tile);
        }

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

        /* set buffers ready */
        ipu_idmac_select_buffer(chan->in_chan, 0);
        ipu_idmac_select_buffer(chan->out_chan, 0);
        if (ipu_rot_mode_is_irt(ctx->rot_mode))
                ipu_idmac_select_buffer(chan->rotation_out_chan, 0);
        if (ctx->double_buffering) {
                ipu_idmac_select_buffer(chan->in_chan, 1);
                ipu_idmac_select_buffer(chan->out_chan, 1);
                if (ipu_rot_mode_is_irt(ctx->rot_mode))
                        ipu_idmac_select_buffer(chan->rotation_out_chan, 1);
        }

        /* enable the channels! */
        ipu_idmac_enable_channel(chan->in_chan);
        ipu_idmac_enable_channel(chan->out_chan);
        if (ipu_rot_mode_is_irt(ctx->rot_mode)) {
                ipu_idmac_enable_channel(chan->rotation_in_chan);
                ipu_idmac_enable_channel(chan->rotation_out_chan);
        }

        ipu_ic_task_enable(chan->ic);

        ipu_cpmem_dump(chan->in_chan);
        ipu_cpmem_dump(chan->out_chan);
        if (ipu_rot_mode_is_irt(ctx->rot_mode)) {
                ipu_cpmem_dump(chan->rotation_in_chan);
                ipu_cpmem_dump(chan->rotation_out_chan);
        }

        ipu_dump(priv->ipu);

        return 0;
}

/* hold irqlock when calling */
static int do_run(struct ipu_image_convert_run *run)
{
        struct ipu_image_convert_ctx *ctx = run->ctx;
        struct ipu_image_convert_chan *chan = ctx->chan;

        lockdep_assert_held(&chan->irqlock);

        ctx->in.base.phys0 = run->in_phys;
        ctx->out.base.phys0 = run->out_phys;

        ctx->cur_buf_num = 0;
        ctx->next_tile = 1;

        /* remove run from pending_q and set as current */
        list_del(&run->list);
        chan->current_run = run;

        return convert_start(run, 0);
}

/* hold irqlock when calling */
static void run_next(struct ipu_image_convert_chan *chan)
{
        struct ipu_image_convert_priv *priv = chan->priv;
        struct ipu_image_convert_run *run, *tmp;
        int ret;

        lockdep_assert_held(&chan->irqlock);

        list_for_each_entry_safe(run, tmp, &chan->pending_q, list) {
                /* skip contexts that are aborting */
                if (run->ctx->aborting) {
                        dev_dbg(priv->ipu->dev,
                                "%s: task %u: skipping aborting ctx %p run %p\n",
                                __func__, chan->ic_task, run->ctx, run);
                        continue;
                }

                ret = do_run(run);
                if (!ret)
                        break;

                /*
                 * something went wrong with start, add the run
                 * to done q and continue to the next run in the
                 * pending q.
                 */
                run->status = ret;
                list_add_tail(&run->list, &chan->done_q);
                chan->current_run = NULL;
        }
}

static void empty_done_q(struct ipu_image_convert_chan *chan)
{
        struct ipu_image_convert_priv *priv = chan->priv;
        struct ipu_image_convert_run *run;
        unsigned long flags;

        spin_lock_irqsave(&chan->irqlock, flags);

        while (!list_empty(&chan->done_q)) {
                run = list_entry(chan->done_q.next,
                                 struct ipu_image_convert_run,
                                 list);

                list_del(&run->list);

                dev_dbg(priv->ipu->dev,
                        "%s: task %u: completing ctx %p run %p with %d\n",
                        __func__, chan->ic_task, run->ctx, run, run->status);

                /* call the completion callback and free the run */
                spin_unlock_irqrestore(&chan->irqlock, flags);
                run->ctx->complete(run, run->ctx->complete_context);
                spin_lock_irqsave(&chan->irqlock, flags);
        }

        spin_unlock_irqrestore(&chan->irqlock, flags);
}

/*
 * the bottom half thread clears out the done_q, calling the
 * completion handler for each.
 */
static irqreturn_t do_bh(int irq, void *dev_id)
{
        struct ipu_image_convert_chan *chan = dev_id;
        struct ipu_image_convert_priv *priv = chan->priv;
        struct ipu_image_convert_ctx *ctx;
        unsigned long flags;

        dev_dbg(priv->ipu->dev, "%s: task %u: enter\n", __func__,
                chan->ic_task);

        empty_done_q(chan);

        spin_lock_irqsave(&chan->irqlock, flags);

        /*
         * the done_q is cleared out, signal any contexts
         * that are aborting that abort can complete.
         */
        list_for_each_entry(ctx, &chan->ctx_list, list) {
                if (ctx->aborting) {
                        dev_dbg(priv->ipu->dev,
                                "%s: task %u: signaling abort for ctx %p\n",
                                __func__, chan->ic_task, ctx);
                        complete_all(&ctx->aborted);
                }
        }

        spin_unlock_irqrestore(&chan->irqlock, flags);

        dev_dbg(priv->ipu->dev, "%s: task %u: exit\n", __func__,
                chan->ic_task);

        return IRQ_HANDLED;
}

static bool ic_settings_changed(struct ipu_image_convert_ctx *ctx)
{
        unsigned int cur_tile = ctx->next_tile - 1;
        unsigned int next_tile = ctx->next_tile;

        if (ctx->resize_coeffs_h[cur_tile % ctx->in.num_cols] !=
            ctx->resize_coeffs_h[next_tile % ctx->in.num_cols] ||
            ctx->resize_coeffs_v[cur_tile / ctx->in.num_cols] !=
            ctx->resize_coeffs_v[next_tile / ctx->in.num_cols] ||
            ctx->in.tile[cur_tile].width != ctx->in.tile[next_tile].width ||
            ctx->in.tile[cur_tile].height != ctx->in.tile[next_tile].height ||
            ctx->out.tile[cur_tile].width != ctx->out.tile[next_tile].width ||
            ctx->out.tile[cur_tile].height != ctx->out.tile[next_tile].height)
                return true;

        return false;
}

/* hold irqlock when calling */
static irqreturn_t do_irq(struct ipu_image_convert_run *run)
{
        struct ipu_image_convert_ctx *ctx = run->ctx;
        struct ipu_image_convert_chan *chan = ctx->chan;
        struct ipu_image_tile *src_tile, *dst_tile;
        struct ipu_image_convert_image *s_image = &ctx->in;
        struct ipu_image_convert_image *d_image = &ctx->out;
        struct ipuv3_channel *outch;
        unsigned int dst_idx;

        lockdep_assert_held(&chan->irqlock);

        outch = ipu_rot_mode_is_irt(ctx->rot_mode) ?
                chan->rotation_out_chan : chan->out_chan;

        /*
         * It is difficult to stop the channel DMA before the channels
         * enter the paused state. Without double-buffering the channels
         * are always in a paused state when the EOF irq occurs, so it
         * is safe to stop the channels now. For double-buffering we
         * just ignore the abort until the operation completes, when it
         * is safe to shut down.
         */
        if (ctx->aborting && !ctx->double_buffering) {
                convert_stop(run);
                run->status = -EIO;
                goto done;
        }

        if (ctx->next_tile == ctx->num_tiles) {
                /*
                 * the conversion is complete
                 */
                convert_stop(run);
                run->status = 0;
                goto done;
        }

        /*
         * not done, place the next tile buffers.
         */
        if (!ctx->double_buffering) {
                if (ic_settings_changed(ctx)) {
                        convert_stop(run);
                        convert_start(run, ctx->next_tile);
                } else {
                        src_tile = &s_image->tile[ctx->next_tile];
                        dst_idx = ctx->out_tile_map[ctx->next_tile];
                        dst_tile = &d_image->tile[dst_idx];

                        ipu_cpmem_set_buffer(chan->in_chan, 0,
                                             s_image->base.phys0 +
                                             src_tile->offset);
                        ipu_cpmem_set_buffer(outch, 0,
                                             d_image->base.phys0 +
                                             dst_tile->offset);
                        if (s_image->fmt->planar)
                                ipu_cpmem_set_uv_offset(chan->in_chan,
                                                        src_tile->u_off,
                                                        src_tile->v_off);
                        if (d_image->fmt->planar)
                                ipu_cpmem_set_uv_offset(outch,
                                                        dst_tile->u_off,
                                                        dst_tile->v_off);

                        ipu_idmac_select_buffer(chan->in_chan, 0);
                        ipu_idmac_select_buffer(outch, 0);
                }
        } else if (ctx->next_tile < ctx->num_tiles - 1) {

                src_tile = &s_image->tile[ctx->next_tile + 1];
                dst_idx = ctx->out_tile_map[ctx->next_tile + 1];
                dst_tile = &d_image->tile[dst_idx];

                ipu_cpmem_set_buffer(chan->in_chan, ctx->cur_buf_num,
                                     s_image->base.phys0 + src_tile->offset);
                ipu_cpmem_set_buffer(outch, ctx->cur_buf_num,
                                     d_image->base.phys0 + dst_tile->offset);

                ipu_idmac_select_buffer(chan->in_chan, ctx->cur_buf_num);
                ipu_idmac_select_buffer(outch, ctx->cur_buf_num);

                ctx->cur_buf_num ^= 1;
        }

        ctx->next_tile++;
        return IRQ_HANDLED;
done:
        list_add_tail(&run->list, &chan->done_q);
        chan->current_run = NULL;
        run_next(chan);
        return IRQ_WAKE_THREAD;
}

static irqreturn_t norotate_irq(int irq, void *data)
{
        struct ipu_image_convert_chan *chan = data;
        struct ipu_image_convert_ctx *ctx;
        struct ipu_image_convert_run *run;
        unsigned long flags;
        irqreturn_t ret;

        spin_lock_irqsave(&chan->irqlock, flags);

        /* get current run and its context */
        run = chan->current_run;
        if (!run) {
                ret = IRQ_NONE;
                goto out;
        }

        ctx = run->ctx;

        if (ipu_rot_mode_is_irt(ctx->rot_mode)) {
                /* this is a rotation operation, just ignore */
                spin_unlock_irqrestore(&chan->irqlock, flags);
                return IRQ_HANDLED;
        }

        ret = do_irq(run);
out:
        spin_unlock_irqrestore(&chan->irqlock, flags);
        return ret;
}

static irqreturn_t rotate_irq(int irq, void *data)
{
        struct ipu_image_convert_chan *chan = data;
        struct ipu_image_convert_priv *priv = chan->priv;
        struct ipu_image_convert_ctx *ctx;
        struct ipu_image_convert_run *run;
        unsigned long flags;
        irqreturn_t ret;

        spin_lock_irqsave(&chan->irqlock, flags);

        /* get current run and its context */
        run = chan->current_run;
        if (!run) {
                ret = IRQ_NONE;
                goto out;
        }

        ctx = run->ctx;

        if (!ipu_rot_mode_is_irt(ctx->rot_mode)) {
                /* this was NOT a rotation operation, shouldn't happen */
                dev_err(priv->ipu->dev, "Unexpected rotation interrupt\n");
                spin_unlock_irqrestore(&chan->irqlock, flags);
                return IRQ_HANDLED;
        }

        ret = do_irq(run);
out:
        spin_unlock_irqrestore(&chan->irqlock, flags);
        return ret;
}

/*
 * try to force the completion of runs for this ctx. Called when
 * abort wait times out in ipu_image_convert_abort().
 */
static void force_abort(struct ipu_image_convert_ctx *ctx)
{
        struct ipu_image_convert_chan *chan = ctx->chan;
        struct ipu_image_convert_run *run;
        unsigned long flags;

        spin_lock_irqsave(&chan->irqlock, flags);

        run = chan->current_run;
        if (run && run->ctx == ctx) {
                convert_stop(run);
                run->status = -EIO;
                list_add_tail(&run->list, &chan->done_q);
                chan->current_run = NULL;
                run_next(chan);
        }

        spin_unlock_irqrestore(&chan->irqlock, flags);

        empty_done_q(chan);
}

static void release_ipu_resources(struct ipu_image_convert_chan *chan)
{
        if (chan->out_eof_irq >= 0)
                free_irq(chan->out_eof_irq, chan);
        if (chan->rot_out_eof_irq >= 0)
                free_irq(chan->rot_out_eof_irq, chan);

        if (!IS_ERR_OR_NULL(chan->in_chan))
                ipu_idmac_put(chan->in_chan);
        if (!IS_ERR_OR_NULL(chan->out_chan))
                ipu_idmac_put(chan->out_chan);
        if (!IS_ERR_OR_NULL(chan->rotation_in_chan))
                ipu_idmac_put(chan->rotation_in_chan);
        if (!IS_ERR_OR_NULL(chan->rotation_out_chan))
                ipu_idmac_put(chan->rotation_out_chan);
        if (!IS_ERR_OR_NULL(chan->ic))
                ipu_ic_put(chan->ic);

        chan->in_chan = chan->out_chan = chan->rotation_in_chan =
                chan->rotation_out_chan = NULL;
        chan->out_eof_irq = chan->rot_out_eof_irq = -1;
}

static int get_ipu_resources(struct ipu_image_convert_chan *chan)
{
        const struct ipu_image_convert_dma_chan *dma = chan->dma_ch;
        struct ipu_image_convert_priv *priv = chan->priv;
        int ret;

        /* get IC */
        chan->ic = ipu_ic_get(priv->ipu, chan->ic_task);
        if (IS_ERR(chan->ic)) {
                dev_err(priv->ipu->dev, "could not acquire IC\n");
                ret = PTR_ERR(chan->ic);
                goto err;
        }

        /* get IDMAC channels */
        chan->in_chan = ipu_idmac_get(priv->ipu, dma->in);
        chan->out_chan = ipu_idmac_get(priv->ipu, dma->out);
        if (IS_ERR(chan->in_chan) || IS_ERR(chan->out_chan)) {
                dev_err(priv->ipu->dev, "could not acquire idmac channels\n");
                ret = -EBUSY;
                goto err;
        }

        chan->rotation_in_chan = ipu_idmac_get(priv->ipu, dma->rot_in);
        chan->rotation_out_chan = ipu_idmac_get(priv->ipu, dma->rot_out);
        if (IS_ERR(chan->rotation_in_chan) || IS_ERR(chan->rotation_out_chan)) {
                dev_err(priv->ipu->dev,
                        "could not acquire idmac rotation channels\n");
                ret = -EBUSY;
                goto err;
        }

        /* acquire the EOF interrupts */
        chan->out_eof_irq = ipu_idmac_channel_irq(priv->ipu,
                                                  chan->out_chan,
                                                  IPU_IRQ_EOF);

        ret = request_threaded_irq(chan->out_eof_irq, norotate_irq, do_bh,
                                   0, "ipu-ic", chan);
        if (ret < 0) {
                dev_err(priv->ipu->dev, "could not acquire irq %d\n",
                         chan->out_eof_irq);
                chan->out_eof_irq = -1;
                goto err;
        }

        chan->rot_out_eof_irq = ipu_idmac_channel_irq(priv->ipu,
                                                     chan->rotation_out_chan,
                                                     IPU_IRQ_EOF);

        ret = request_threaded_irq(chan->rot_out_eof_irq, rotate_irq, do_bh,
                                   0, "ipu-ic", chan);
        if (ret < 0) {
                dev_err(priv->ipu->dev, "could not acquire irq %d\n",
                        chan->rot_out_eof_irq);
                chan->rot_out_eof_irq = -1;
                goto err;
        }

        return 0;
err:
        release_ipu_resources(chan);
        return ret;
}

static int fill_image(struct ipu_image_convert_ctx *ctx,
                      struct ipu_image_convert_image *ic_image,
                      struct ipu_image *image,
                      enum ipu_image_convert_type type)
{
        struct ipu_image_convert_priv *priv = ctx->chan->priv;

        ic_image->base = *image;
        ic_image->type = type;

        ic_image->fmt = get_format(image->pix.pixelformat);
        if (!ic_image->fmt) {
                dev_err(priv->ipu->dev, "pixelformat not supported for %s\n",
                        type == IMAGE_CONVERT_OUT ? "Output" : "Input");
                return -EINVAL;
        }

        if (ic_image->fmt->planar)
                ic_image->stride = ic_image->base.pix.width;
        else
                ic_image->stride  = ic_image->base.pix.bytesperline;

        return 0;
}

/* borrowed from drivers/media/v4l2-core/v4l2-common.c */
static unsigned int clamp_align(unsigned int x, unsigned int min,
                                unsigned int max, unsigned int align)
{
        /* Bits that must be zero to be aligned */
        unsigned int mask = ~((1 << align) - 1);

        /* Clamp to aligned min and max */
        x = clamp(x, (min + ~mask) & mask, max & mask);

        /* Round to nearest aligned value */
        if (align)
                x = (x + (1 << (align - 1))) & mask;

        return x;
}

/* Adjusts input/output images to IPU restrictions */
void ipu_image_convert_adjust(struct ipu_image *in, struct ipu_image *out,
                              enum ipu_rotate_mode rot_mode)
{
        const struct ipu_image_pixfmt *infmt, *outfmt;
        u32 w_align, h_align;

        infmt = get_format(in->pix.pixelformat);
        outfmt = get_format(out->pix.pixelformat);

        /* set some default pixel formats if needed */
        if (!infmt) {
                in->pix.pixelformat = V4L2_PIX_FMT_RGB24;
                infmt = get_format(V4L2_PIX_FMT_RGB24);
        }
        if (!outfmt) {
                out->pix.pixelformat = V4L2_PIX_FMT_RGB24;
                outfmt = get_format(V4L2_PIX_FMT_RGB24);
        }

        /* image converter does not handle fields */
        in->pix.field = out->pix.field = V4L2_FIELD_NONE;

        /* resizer cannot downsize more than 4:1 */
        if (ipu_rot_mode_is_irt(rot_mode)) {
                out->pix.height = max_t(__u32, out->pix.height,
                                        in->pix.width / 4);
                out->pix.width = max_t(__u32, out->pix.width,
                                       in->pix.height / 4);
        } else {
                out->pix.width = max_t(__u32, out->pix.width,
                                       in->pix.width / 4);
                out->pix.height = max_t(__u32, out->pix.height,
                                        in->pix.height / 4);
        }

        /* align input width/height */
        w_align = ilog2(tile_width_align(IMAGE_CONVERT_IN, infmt, rot_mode));
        h_align = ilog2(tile_height_align(IMAGE_CONVERT_IN, infmt, rot_mode));
        in->pix.width = clamp_align(in->pix.width, MIN_W, MAX_W, w_align);
        in->pix.height = clamp_align(in->pix.height, MIN_H, MAX_H, h_align);

        /* align output width/height */
        w_align = ilog2(tile_width_align(IMAGE_CONVERT_OUT, outfmt, rot_mode));
        h_align = ilog2(tile_height_align(IMAGE_CONVERT_OUT, outfmt, rot_mode));
        out->pix.width = clamp_align(out->pix.width, MIN_W, MAX_W, w_align);
        out->pix.height = clamp_align(out->pix.height, MIN_H, MAX_H, h_align);

        /* set input/output strides and image sizes */
        in->pix.bytesperline = infmt->planar ?
                clamp_align(in->pix.width, 2 << w_align, MAX_W, w_align) :
                clamp_align((in->pix.width * infmt->bpp) >> 3,
                            2 << w_align, MAX_W, w_align);
        in->pix.sizeimage = infmt->planar ?
                (in->pix.height * in->pix.bytesperline * infmt->bpp) >> 3 :
                in->pix.height * in->pix.bytesperline;
        out->pix.bytesperline = outfmt->planar ? out->pix.width :
                (out->pix.width * outfmt->bpp) >> 3;
        out->pix.sizeimage = outfmt->planar ?
                (out->pix.height * out->pix.bytesperline * outfmt->bpp) >> 3 :
                out->pix.height * out->pix.bytesperline;
}
EXPORT_SYMBOL_GPL(ipu_image_convert_adjust);

/*
 * this is used by ipu_image_convert_prepare() to verify set input and
 * output images are valid before starting the conversion. Clients can
 * also call it before calling ipu_image_convert_prepare().
 */
int ipu_image_convert_verify(struct ipu_image *in, struct ipu_image *out,
                             enum ipu_rotate_mode rot_mode)
{
        struct ipu_image testin, testout;

        testin = *in;
        testout = *out;

        ipu_image_convert_adjust(&testin, &testout, rot_mode);

        if (testin.pix.width != in->pix.width ||
            testin.pix.height != in->pix.height ||
            testout.pix.width != out->pix.width ||
            testout.pix.height != out->pix.height)
                return -EINVAL;

        return 0;
}
EXPORT_SYMBOL_GPL(ipu_image_convert_verify);

/*
 * Call ipu_image_convert_prepare() to prepare for the conversion of
 * given images and rotation mode. Returns a new conversion context.
 */
struct ipu_image_convert_ctx *
ipu_image_convert_prepare(struct ipu_soc *ipu, enum ipu_ic_task ic_task,
                          struct ipu_image *in, struct ipu_image *out,
                          enum ipu_rotate_mode rot_mode,
                          ipu_image_convert_cb_t complete,
                          void *complete_context)
{
        struct ipu_image_convert_priv *priv = ipu->image_convert_priv;
        struct ipu_image_convert_image *s_image, *d_image;
        struct ipu_image_convert_chan *chan;
        struct ipu_image_convert_ctx *ctx;
        unsigned long flags;
        unsigned int i;
        bool get_res;
        int ret;

        if (!in || !out || !complete ||
            (ic_task != IC_TASK_VIEWFINDER &&
             ic_task != IC_TASK_POST_PROCESSOR))
                return ERR_PTR(-EINVAL);

        /* verify the in/out images before continuing */
        ret = ipu_image_convert_verify(in, out, rot_mode);
        if (ret) {
                dev_err(priv->ipu->dev, "%s: in/out formats invalid\n",
                        __func__);
                return ERR_PTR(ret);
        }

        chan = &priv->chan[ic_task];

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

        dev_dbg(priv->ipu->dev, "%s: task %u: ctx %p\n", __func__,
                chan->ic_task, ctx);

        ctx->chan = chan;
        init_completion(&ctx->aborted);

        s_image = &ctx->in;
        d_image = &ctx->out;

        /* set tiling and rotation */
        d_image->num_rows = num_stripes(out->pix.height);
        d_image->num_cols = num_stripes(out->pix.width);
        if (ipu_rot_mode_is_irt(rot_mode)) {
                s_image->num_rows = d_image->num_cols;
                s_image->num_cols = d_image->num_rows;
        } else {
                s_image->num_rows = d_image->num_rows;
                s_image->num_cols = d_image->num_cols;
        }

        ctx->num_tiles = d_image->num_cols * d_image->num_rows;
        ctx->rot_mode = rot_mode;

        ret = fill_image(ctx, s_image, in, IMAGE_CONVERT_IN);
        if (ret)
                goto out_free;
        ret = fill_image(ctx, d_image, out, IMAGE_CONVERT_OUT);
        if (ret)
                goto out_free;

        ret = calc_image_resize_coefficients(ctx, in, out);
        if (ret)
                goto out_free;

        calc_out_tile_map(ctx);

        find_seams(ctx, s_image, d_image);

        calc_tile_dimensions(ctx, s_image);
        ret = calc_tile_offsets(ctx, s_image);
        if (ret)
                goto out_free;

        calc_tile_dimensions(ctx, d_image);
        ret = calc_tile_offsets(ctx, d_image);
        if (ret)
                goto out_free;

        calc_tile_resize_coefficients(ctx);

        dump_format(ctx, s_image);
        dump_format(ctx, d_image);

        ctx->complete = complete;
        ctx->complete_context = complete_context;

        /*
         * Can we use double-buffering for this operation? If there is
         * only one tile (the whole image can be converted in a single
         * operation) there's no point in using double-buffering. Also,
         * the IPU's IDMAC channels allow only a single U and V plane
         * offset shared between both buffers, but these offsets change
         * for every tile, and therefore would have to be updated for
         * each buffer which is not possible. So double-buffering is
         * impossible when either the source or destination images are
         * a planar format (YUV420, YUV422P, etc.). Further, differently
         * sized tiles or different resizing coefficients per tile
         * prevent double-buffering as well.
         */
        ctx->double_buffering = (ctx->num_tiles > 1 &&
                                 !s_image->fmt->planar &&
                                 !d_image->fmt->planar);
        for (i = 1; i < ctx->num_tiles; i++) {
                if (ctx->in.tile[i].width != ctx->in.tile[0].width ||
                    ctx->in.tile[i].height != ctx->in.tile[0].height ||
                    ctx->out.tile[i].width != ctx->out.tile[0].width ||
                    ctx->out.tile[i].height != ctx->out.tile[0].height) {
                        ctx->double_buffering = false;
                        break;
                }
        }
        for (i = 1; i < ctx->in.num_cols; i++) {
                if (ctx->resize_coeffs_h[i] != ctx->resize_coeffs_h[0]) {
                        ctx->double_buffering = false;
                        break;
                }
        }
        for (i = 1; i < ctx->in.num_rows; i++) {
                if (ctx->resize_coeffs_v[i] != ctx->resize_coeffs_v[0]) {
                        ctx->double_buffering = false;
                        break;
                }
        }

        if (ipu_rot_mode_is_irt(ctx->rot_mode)) {
                unsigned long intermediate_size = d_image->tile[0].size;

                for (i = 1; i < ctx->num_tiles; i++) {
                        if (d_image->tile[i].size > intermediate_size)
                                intermediate_size = d_image->tile[i].size;
                }

                ret = alloc_dma_buf(priv, &ctx->rot_intermediate[0],
                                    intermediate_size);
                if (ret)
                        goto out_free;
                if (ctx->double_buffering) {
                        ret = alloc_dma_buf(priv,
                                            &ctx->rot_intermediate[1],
                                            intermediate_size);
                        if (ret)
                                goto out_free_dmabuf0;
                }
        }

        spin_lock_irqsave(&chan->irqlock, flags);

        get_res = list_empty(&chan->ctx_list);

        list_add_tail(&ctx->list, &chan->ctx_list);

        spin_unlock_irqrestore(&chan->irqlock, flags);

        if (get_res) {
                ret = get_ipu_resources(chan);
                if (ret)
                        goto out_free_dmabuf1;
        }

        return ctx;

out_free_dmabuf1:
        free_dma_buf(priv, &ctx->rot_intermediate[1]);
        spin_lock_irqsave(&chan->irqlock, flags);
        list_del(&ctx->list);
        spin_unlock_irqrestore(&chan->irqlock, flags);
out_free_dmabuf0:
        free_dma_buf(priv, &ctx->rot_intermediate[0]);
out_free:
        kfree(ctx);
        return ERR_PTR(ret);
}
EXPORT_SYMBOL_GPL(ipu_image_convert_prepare);

/*
 * Carry out a single image conversion run. Only the physaddr's of the input
 * and output image buffers are needed. The conversion context must have
 * been created previously with ipu_image_convert_prepare().
 */
int ipu_image_convert_queue(struct ipu_image_convert_run *run)
{
        struct ipu_image_convert_chan *chan;
        struct ipu_image_convert_priv *priv;
        struct ipu_image_convert_ctx *ctx;
        unsigned long flags;
        int ret = 0;

        if (!run || !run->ctx || !run->in_phys || !run->out_phys)
                return -EINVAL;

        ctx = run->ctx;
        chan = ctx->chan;
        priv = chan->priv;

        dev_dbg(priv->ipu->dev, "%s: task %u: ctx %p run %p\n", __func__,
                chan->ic_task, ctx, run);

        INIT_LIST_HEAD(&run->list);

        spin_lock_irqsave(&chan->irqlock, flags);

        if (ctx->aborting) {
                ret = -EIO;
                goto unlock;
        }

        list_add_tail(&run->list, &chan->pending_q);

        if (!chan->current_run) {
                ret = do_run(run);
                if (ret)
                        chan->current_run = NULL;
        }
unlock:
        spin_unlock_irqrestore(&chan->irqlock, flags);
        return ret;
}
EXPORT_SYMBOL_GPL(ipu_image_convert_queue);

/* Abort any active or pending conversions for this context */
static void __ipu_image_convert_abort(struct ipu_image_convert_ctx *ctx)
{
        struct ipu_image_convert_chan *chan = ctx->chan;
        struct ipu_image_convert_priv *priv = chan->priv;
        struct ipu_image_convert_run *run, *active_run, *tmp;
        unsigned long flags;
        int run_count, ret;

        spin_lock_irqsave(&chan->irqlock, flags);

        /* move all remaining pending runs in this context to done_q */
        list_for_each_entry_safe(run, tmp, &chan->pending_q, list) {
                if (run->ctx != ctx)
                        continue;
                run->status = -EIO;
                list_move_tail(&run->list, &chan->done_q);
        }

        run_count = get_run_count(ctx, &chan->done_q);
        active_run = (chan->current_run && chan->current_run->ctx == ctx) ?
                chan->current_run : NULL;

        if (active_run)
                reinit_completion(&ctx->aborted);

        ctx->aborting = true;

        spin_unlock_irqrestore(&chan->irqlock, flags);

        if (!run_count && !active_run) {
                dev_dbg(priv->ipu->dev,
                        "%s: task %u: no abort needed for ctx %p\n",
                        __func__, chan->ic_task, ctx);
                return;
        }

        if (!active_run) {
                empty_done_q(chan);
                return;
        }

        dev_dbg(priv->ipu->dev,
                "%s: task %u: wait for completion: %d runs\n",
                __func__, chan->ic_task, run_count);

        ret = wait_for_completion_timeout(&ctx->aborted,
                                          msecs_to_jiffies(10000));
        if (ret == 0) {
                dev_warn(priv->ipu->dev, "%s: timeout\n", __func__);
                force_abort(ctx);
        }
}

void ipu_image_convert_abort(struct ipu_image_convert_ctx *ctx)
{
        __ipu_image_convert_abort(ctx);
        ctx->aborting = false;
}
EXPORT_SYMBOL_GPL(ipu_image_convert_abort);

/* Unprepare image conversion context */
void ipu_image_convert_unprepare(struct ipu_image_convert_ctx *ctx)
{
        struct ipu_image_convert_chan *chan = ctx->chan;
        struct ipu_image_convert_priv *priv = chan->priv;
        unsigned long flags;
        bool put_res;

        /* make sure no runs are hanging around */
        __ipu_image_convert_abort(ctx);

        dev_dbg(priv->ipu->dev, "%s: task %u: removing ctx %p\n", __func__,
                chan->ic_task, ctx);

        spin_lock_irqsave(&chan->irqlock, flags);

        list_del(&ctx->list);

        put_res = list_empty(&chan->ctx_list);

        spin_unlock_irqrestore(&chan->irqlock, flags);

        if (put_res)
                release_ipu_resources(chan);

        free_dma_buf(priv, &ctx->rot_intermediate[1]);
        free_dma_buf(priv, &ctx->rot_intermediate[0]);

        kfree(ctx);
}
EXPORT_SYMBOL_GPL(ipu_image_convert_unprepare);

/*
 * "Canned" asynchronous single image conversion. Allocates and returns
 * a new conversion run.  On successful return the caller must free the
 * run and call ipu_image_convert_unprepare() after conversion completes.
 */
struct ipu_image_convert_run *
ipu_image_convert(struct ipu_soc *ipu, enum ipu_ic_task ic_task,
                  struct ipu_image *in, struct ipu_image *out,
                  enum ipu_rotate_mode rot_mode,
                  ipu_image_convert_cb_t complete,
                  void *complete_context)
{
        struct ipu_image_convert_ctx *ctx;
        struct ipu_image_convert_run *run;
        int ret;

        ctx = ipu_image_convert_prepare(ipu, ic_task, in, out, rot_mode,
                                        complete, complete_context);
        if (IS_ERR(ctx))
                return ERR_CAST(ctx);

        run = kzalloc(sizeof(*run), GFP_KERNEL);
        if (!run) {
                ipu_image_convert_unprepare(ctx);
                return ERR_PTR(-ENOMEM);
        }

        run->ctx = ctx;
        run->in_phys = in->phys0;
        run->out_phys = out->phys0;

        ret = ipu_image_convert_queue(run);
        if (ret) {
                ipu_image_convert_unprepare(ctx);
                kfree(run);
                return ERR_PTR(ret);
        }

        return run;
}
EXPORT_SYMBOL_GPL(ipu_image_convert);

/* "Canned" synchronous single image conversion */
static void image_convert_sync_complete(struct ipu_image_convert_run *run,
                                        void *data)
{
        struct completion *comp = data;

        complete(comp);
}

int ipu_image_convert_sync(struct ipu_soc *ipu, enum ipu_ic_task ic_task,
                           struct ipu_image *in, struct ipu_image *out,
                           enum ipu_rotate_mode rot_mode)
{
        struct ipu_image_convert_run *run;
        struct completion comp;
        int ret;

        init_completion(&comp);

        run = ipu_image_convert(ipu, ic_task, in, out, rot_mode,
                                image_convert_sync_complete, &comp);
        if (IS_ERR(run))
                return PTR_ERR(run);

        ret = wait_for_completion_timeout(&comp, msecs_to_jiffies(10000));
        ret = (ret == 0) ? -ETIMEDOUT : 0;

        ipu_image_convert_unprepare(run->ctx);
        kfree(run);

        return ret;
}
EXPORT_SYMBOL_GPL(ipu_image_convert_sync);

int ipu_image_convert_init(struct ipu_soc *ipu, struct device *dev)
{
        struct ipu_image_convert_priv *priv;
        int i;

        priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
        if (!priv)
                return -ENOMEM;

        ipu->image_convert_priv = priv;
        priv->ipu = ipu;

        for (i = 0; i < IC_NUM_TASKS; i++) {
                struct ipu_image_convert_chan *chan = &priv->chan[i];

                chan->ic_task = i;
                chan->priv = priv;
                chan->dma_ch = &image_convert_dma_chan[i];
                chan->out_eof_irq = -1;
                chan->rot_out_eof_irq = -1;

                spin_lock_init(&chan->irqlock);
                INIT_LIST_HEAD(&chan->ctx_list);
                INIT_LIST_HEAD(&chan->pending_q);
                INIT_LIST_HEAD(&chan->done_q);
        }

        return 0;
}

void ipu_image_convert_exit(struct ipu_soc *ipu)
{
}