/*
 * Coda multi-standard codec IP - BIT processor functions
 *
 * Copyright (C) 2012 Vista Silicon S.L.
 *    Javier Martin, <javier.martin@vista-silicon.com>
 *    Xavier Duret
 * Copyright (C) 2012-2014 Philipp Zabel, Pengutronix
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 */

#include <linux/clk.h>
#include <linux/irqreturn.h>
#include <linux/kernel.h>
#include <linux/log2.h>
#include <linux/platform_device.h>
#include <linux/reset.h>
#include <linux/slab.h>
#include <linux/videodev2.h>

#include <media/v4l2-common.h>
#include <media/v4l2-ctrls.h>
#include <media/v4l2-fh.h>
#include <media/v4l2-mem2mem.h>
#include <media/videobuf2-v4l2.h>
#include <media/videobuf2-dma-contig.h>
#include <media/videobuf2-vmalloc.h>

#include "coda.h"
#include "imx-vdoa.h"
#define CREATE_TRACE_POINTS
#include "trace.h"

#define CODA_PARA_BUF_SIZE      (10 * 1024)
#define CODA7_PS_BUF_SIZE       0x28000
#define CODA9_PS_SAVE_SIZE      (512 * 1024)

#define CODA_DEFAULT_GAMMA      4096
#define CODA9_DEFAULT_GAMMA     24576   /* 0.75 * 32768 */

static void coda_free_bitstream_buffer(struct coda_ctx *ctx);

static inline int coda_is_initialized(struct coda_dev *dev)
{
        return coda_read(dev, CODA_REG_BIT_CUR_PC) != 0;
}

static inline unsigned long coda_isbusy(struct coda_dev *dev)
{
        return coda_read(dev, CODA_REG_BIT_BUSY);
}

static int coda_wait_timeout(struct coda_dev *dev)
{
        unsigned long timeout = jiffies + msecs_to_jiffies(1000);

        while (coda_isbusy(dev)) {
                if (time_after(jiffies, timeout))
                        return -ETIMEDOUT;
        }
        return 0;
}

static void coda_command_async(struct coda_ctx *ctx, int cmd)
{
        struct coda_dev *dev = ctx->dev;

        if (dev->devtype->product == CODA_960 ||
            dev->devtype->product == CODA_7541) {
                /* Restore context related registers to CODA */
                coda_write(dev, ctx->bit_stream_param,
                                CODA_REG_BIT_BIT_STREAM_PARAM);
                coda_write(dev, ctx->frm_dis_flg,
                                CODA_REG_BIT_FRM_DIS_FLG(ctx->reg_idx));
                coda_write(dev, ctx->frame_mem_ctrl,
                                CODA_REG_BIT_FRAME_MEM_CTRL);
                coda_write(dev, ctx->workbuf.paddr, CODA_REG_BIT_WORK_BUF_ADDR);
        }

        if (dev->devtype->product == CODA_960) {
                coda_write(dev, 1, CODA9_GDI_WPROT_ERR_CLR);
                coda_write(dev, 0, CODA9_GDI_WPROT_RGN_EN);
        }

        coda_write(dev, CODA_REG_BIT_BUSY_FLAG, CODA_REG_BIT_BUSY);

        coda_write(dev, ctx->idx, CODA_REG_BIT_RUN_INDEX);
        coda_write(dev, ctx->params.codec_mode, CODA_REG_BIT_RUN_COD_STD);
        coda_write(dev, ctx->params.codec_mode_aux, CODA7_REG_BIT_RUN_AUX_STD);

        trace_coda_bit_run(ctx, cmd);

        coda_write(dev, cmd, CODA_REG_BIT_RUN_COMMAND);
}

static int coda_command_sync(struct coda_ctx *ctx, int cmd)
{
        struct coda_dev *dev = ctx->dev;
        int ret;

        coda_command_async(ctx, cmd);
        ret = coda_wait_timeout(dev);
        trace_coda_bit_done(ctx);

        return ret;
}

int coda_hw_reset(struct coda_ctx *ctx)
{
        struct coda_dev *dev = ctx->dev;
        unsigned long timeout;
        unsigned int idx;
        int ret;

        if (!dev->rstc)
                return -ENOENT;

        idx = coda_read(dev, CODA_REG_BIT_RUN_INDEX);

        if (dev->devtype->product == CODA_960) {
                timeout = jiffies + msecs_to_jiffies(100);
                coda_write(dev, 0x11, CODA9_GDI_BUS_CTRL);
                while (coda_read(dev, CODA9_GDI_BUS_STATUS) != 0x77) {
                        if (time_after(jiffies, timeout))
                                return -ETIME;
                        cpu_relax();
                }
        }

        ret = reset_control_reset(dev->rstc);
        if (ret < 0)
                return ret;

        if (dev->devtype->product == CODA_960)
                coda_write(dev, 0x00, CODA9_GDI_BUS_CTRL);
        coda_write(dev, CODA_REG_BIT_BUSY_FLAG, CODA_REG_BIT_BUSY);
        coda_write(dev, CODA_REG_RUN_ENABLE, CODA_REG_BIT_CODE_RUN);
        ret = coda_wait_timeout(dev);
        coda_write(dev, idx, CODA_REG_BIT_RUN_INDEX);

        return ret;
}

static void coda_kfifo_sync_from_device(struct coda_ctx *ctx)
{
        struct __kfifo *kfifo = &ctx->bitstream_fifo.kfifo;
        struct coda_dev *dev = ctx->dev;
        u32 rd_ptr;

        rd_ptr = coda_read(dev, CODA_REG_BIT_RD_PTR(ctx->reg_idx));
        kfifo->out = (kfifo->in & ~kfifo->mask) |
                      (rd_ptr - ctx->bitstream.paddr);
        if (kfifo->out > kfifo->in)
                kfifo->out -= kfifo->mask + 1;
}

static void coda_kfifo_sync_to_device_full(struct coda_ctx *ctx)
{
        struct __kfifo *kfifo = &ctx->bitstream_fifo.kfifo;
        struct coda_dev *dev = ctx->dev;
        u32 rd_ptr, wr_ptr;

        rd_ptr = ctx->bitstream.paddr + (kfifo->out & kfifo->mask);
        coda_write(dev, rd_ptr, CODA_REG_BIT_RD_PTR(ctx->reg_idx));
        wr_ptr = ctx->bitstream.paddr + (kfifo->in & kfifo->mask);
        coda_write(dev, wr_ptr, CODA_REG_BIT_WR_PTR(ctx->reg_idx));
}

static void coda_kfifo_sync_to_device_write(struct coda_ctx *ctx)
{
        struct __kfifo *kfifo = &ctx->bitstream_fifo.kfifo;
        struct coda_dev *dev = ctx->dev;
        u32 wr_ptr;

        wr_ptr = ctx->bitstream.paddr + (kfifo->in & kfifo->mask);
        coda_write(dev, wr_ptr, CODA_REG_BIT_WR_PTR(ctx->reg_idx));
}

static int coda_bitstream_queue(struct coda_ctx *ctx,
                                struct vb2_v4l2_buffer *src_buf)
{
        u32 src_size = vb2_get_plane_payload(&src_buf->vb2_buf, 0);
        u32 n;

        n = kfifo_in(&ctx->bitstream_fifo,
                        vb2_plane_vaddr(&src_buf->vb2_buf, 0), src_size);
        if (n < src_size)
                return -ENOSPC;

        src_buf->sequence = ctx->qsequence++;

        return 0;
}

static bool coda_bitstream_try_queue(struct coda_ctx *ctx,
                                     struct vb2_v4l2_buffer *src_buf)
{
        int ret;

        if (coda_get_bitstream_payload(ctx) +
            vb2_get_plane_payload(&src_buf->vb2_buf, 0) + 512 >=
            ctx->bitstream.size)
                return false;

        if (vb2_plane_vaddr(&src_buf->vb2_buf, 0) == NULL) {
                v4l2_err(&ctx->dev->v4l2_dev, "trying to queue empty buffer\n");
                return true;
        }

        ret = coda_bitstream_queue(ctx, src_buf);
        if (ret < 0) {
                v4l2_err(&ctx->dev->v4l2_dev, "bitstream buffer overflow\n");
                return false;
        }
        /* Sync read pointer to device */
        if (ctx == v4l2_m2m_get_curr_priv(ctx->dev->m2m_dev))
                coda_kfifo_sync_to_device_write(ctx);

        ctx->hold = false;

        return true;
}

void coda_fill_bitstream(struct coda_ctx *ctx, bool streaming)
{
        struct vb2_v4l2_buffer *src_buf;
        struct coda_buffer_meta *meta;
        unsigned long flags;
        u32 start;

        if (ctx->bit_stream_param & CODA_BIT_STREAM_END_FLAG)
                return;

        while (v4l2_m2m_num_src_bufs_ready(ctx->fh.m2m_ctx) > 0) {
                /*
                 * Only queue a single JPEG into the bitstream buffer, except
                 * to increase payload over 512 bytes or if in hold state.
                 */
                if (ctx->codec->src_fourcc == V4L2_PIX_FMT_JPEG &&
                    (coda_get_bitstream_payload(ctx) >= 512) && !ctx->hold)
                        break;

                src_buf = v4l2_m2m_next_src_buf(ctx->fh.m2m_ctx);

                /* Drop frames that do not start/end with a SOI/EOI markers */
                if (ctx->codec->src_fourcc == V4L2_PIX_FMT_JPEG &&
                    !coda_jpeg_check_buffer(ctx, &src_buf->vb2_buf)) {
                        v4l2_err(&ctx->dev->v4l2_dev,
                                 "dropping invalid JPEG frame %d\n",
                                 ctx->qsequence);
                        src_buf = v4l2_m2m_src_buf_remove(ctx->fh.m2m_ctx);
                        v4l2_m2m_buf_done(src_buf, streaming ?
                                          VB2_BUF_STATE_ERROR :
                                          VB2_BUF_STATE_QUEUED);
                        continue;
                }

                /* Dump empty buffers */
                if (!vb2_get_plane_payload(&src_buf->vb2_buf, 0)) {
                        src_buf = v4l2_m2m_src_buf_remove(ctx->fh.m2m_ctx);
                        v4l2_m2m_buf_done(src_buf, VB2_BUF_STATE_DONE);
                        continue;
                }

                /* Buffer start position */
                start = ctx->bitstream_fifo.kfifo.in &
                        ctx->bitstream_fifo.kfifo.mask;

                if (coda_bitstream_try_queue(ctx, src_buf)) {
                        /*
                         * Source buffer is queued in the bitstream ringbuffer;
                         * queue the timestamp and mark source buffer as done
                         */
                        src_buf = v4l2_m2m_src_buf_remove(ctx->fh.m2m_ctx);

                        meta = kmalloc(sizeof(*meta), GFP_KERNEL);
                        if (meta) {
                                meta->sequence = src_buf->sequence;
                                meta->timecode = src_buf->timecode;
                                meta->timestamp = src_buf->vb2_buf.timestamp;
                                meta->start = start;
                                meta->end = ctx->bitstream_fifo.kfifo.in &
                                            ctx->bitstream_fifo.kfifo.mask;
                                spin_lock_irqsave(&ctx->buffer_meta_lock,
                                                  flags);
                                list_add_tail(&meta->list,
                                              &ctx->buffer_meta_list);
                                ctx->num_metas++;
                                spin_unlock_irqrestore(&ctx->buffer_meta_lock,
                                                       flags);

                                trace_coda_bit_queue(ctx, src_buf, meta);
                        }

                        v4l2_m2m_buf_done(src_buf, VB2_BUF_STATE_DONE);
                } else {
                        break;
                }
        }
}

void coda_bit_stream_end_flag(struct coda_ctx *ctx)
{
        struct coda_dev *dev = ctx->dev;

        ctx->bit_stream_param |= CODA_BIT_STREAM_END_FLAG;

        /* If this context is currently running, update the hardware flag */
        if ((dev->devtype->product == CODA_960) &&
            coda_isbusy(dev) &&
            (ctx->idx == coda_read(dev, CODA_REG_BIT_RUN_INDEX))) {
                coda_write(dev, ctx->bit_stream_param,
                           CODA_REG_BIT_BIT_STREAM_PARAM);
        }
}

static void coda_parabuf_write(struct coda_ctx *ctx, int index, u32 value)
{
        struct coda_dev *dev = ctx->dev;
        u32 *p = ctx->parabuf.vaddr;

        if (dev->devtype->product == CODA_DX6)
                p[index] = value;
        else
                p[index ^ 1] = value;
}

static inline int coda_alloc_context_buf(struct coda_ctx *ctx,
                                         struct coda_aux_buf *buf, size_t size,
                                         const char *name)
{
        return coda_alloc_aux_buf(ctx->dev, buf, size, name, ctx->debugfs_entry);
}


static void coda_free_framebuffers(struct coda_ctx *ctx)
{
        int i;

        for (i = 0; i < CODA_MAX_FRAMEBUFFERS; i++)
                coda_free_aux_buf(ctx->dev, &ctx->internal_frames[i]);
}

static int coda_alloc_framebuffers(struct coda_ctx *ctx,
                                   struct coda_q_data *q_data, u32 fourcc)
{
        struct coda_dev *dev = ctx->dev;
        int width, height;
        int ysize;
        int ret;
        int i;

        if (ctx->codec && (ctx->codec->src_fourcc == V4L2_PIX_FMT_H264 ||
             ctx->codec->dst_fourcc == V4L2_PIX_FMT_H264)) {
                width = round_up(q_data->width, 16);
                height = round_up(q_data->height, 16);
        } else {
                width = round_up(q_data->width, 8);
                height = q_data->height;
        }
        ysize = width * height;

        /* Allocate frame buffers */
        for (i = 0; i < ctx->num_internal_frames; i++) {
                size_t size;
                char *name;

                if (ctx->tiled_map_type == GDI_TILED_FRAME_MB_RASTER_MAP)
                        size = round_up(ysize, 4096) + ysize / 2;
                else
                        size = ysize + ysize / 2;
                if (ctx->codec->src_fourcc == V4L2_PIX_FMT_H264 &&
                    dev->devtype->product != CODA_DX6)
                        size += ysize / 4;
                name = kasprintf(GFP_KERNEL, "fb%d", i);
                ret = coda_alloc_context_buf(ctx, &ctx->internal_frames[i],
                                             size, name);
                kfree(name);
                if (ret < 0) {
                        coda_free_framebuffers(ctx);
                        return ret;
                }
        }

        /* Register frame buffers in the parameter buffer */
        for (i = 0; i < ctx->num_internal_frames; i++) {
                u32 y, cb, cr;

                /* Start addresses of Y, Cb, Cr planes */
                y = ctx->internal_frames[i].paddr;
                cb = y + ysize;
                cr = y + ysize + ysize/4;
                if (ctx->tiled_map_type == GDI_TILED_FRAME_MB_RASTER_MAP) {
                        cb = round_up(cb, 4096);
                        cr = 0;
                        /* Packed 20-bit MSB of base addresses */
                        /* YYYYYCCC, CCyyyyyc, cccc.... */
                        y = (y & 0xfffff000) | cb >> 20;
                        cb = (cb & 0x000ff000) << 12;
                }
                coda_parabuf_write(ctx, i * 3 + 0, y);
                coda_parabuf_write(ctx, i * 3 + 1, cb);
                coda_parabuf_write(ctx, i * 3 + 2, cr);

                /* mvcol buffer for h.264 */
                if (ctx->codec->src_fourcc == V4L2_PIX_FMT_H264 &&
                    dev->devtype->product != CODA_DX6)
                        coda_parabuf_write(ctx, 96 + i,
                                           ctx->internal_frames[i].paddr +
                                           ysize + ysize/4 + ysize/4);
        }

        /* mvcol buffer for mpeg4 */
        if ((dev->devtype->product != CODA_DX6) &&
            (ctx->codec->src_fourcc == V4L2_PIX_FMT_MPEG4))
                coda_parabuf_write(ctx, 97, ctx->internal_frames[0].paddr +
                                            ysize + ysize/4 + ysize/4);

        return 0;
}

static void coda_free_context_buffers(struct coda_ctx *ctx)
{
        struct coda_dev *dev = ctx->dev;

        coda_free_aux_buf(dev, &ctx->slicebuf);
        coda_free_aux_buf(dev, &ctx->psbuf);
        if (dev->devtype->product != CODA_DX6)
                coda_free_aux_buf(dev, &ctx->workbuf);
        coda_free_aux_buf(dev, &ctx->parabuf);
}

static int coda_alloc_context_buffers(struct coda_ctx *ctx,
                                      struct coda_q_data *q_data)
{
        struct coda_dev *dev = ctx->dev;
        size_t size;
        int ret;

        if (!ctx->parabuf.vaddr) {
                ret = coda_alloc_context_buf(ctx, &ctx->parabuf,
                                             CODA_PARA_BUF_SIZE, "parabuf");
                if (ret < 0)
                        return ret;
        }

        if (dev->devtype->product == CODA_DX6)
                return 0;

        if (!ctx->slicebuf.vaddr && q_data->fourcc == V4L2_PIX_FMT_H264) {
                /* worst case slice size */
                size = (DIV_ROUND_UP(q_data->width, 16) *
                        DIV_ROUND_UP(q_data->height, 16)) * 3200 / 8 + 512;
                ret = coda_alloc_context_buf(ctx, &ctx->slicebuf, size,
                                             "slicebuf");
                if (ret < 0)
                        goto err;
        }

        if (!ctx->psbuf.vaddr && dev->devtype->product == CODA_7541) {
                ret = coda_alloc_context_buf(ctx, &ctx->psbuf,
                                             CODA7_PS_BUF_SIZE, "psbuf");
                if (ret < 0)
                        goto err;
        }

        if (!ctx->workbuf.vaddr) {
                size = dev->devtype->workbuf_size;
                if (dev->devtype->product == CODA_960 &&
                    q_data->fourcc == V4L2_PIX_FMT_H264)
                        size += CODA9_PS_SAVE_SIZE;
                ret = coda_alloc_context_buf(ctx, &ctx->workbuf, size,
                                             "workbuf");
                if (ret < 0)
                        goto err;
        }

        return 0;

err:
        coda_free_context_buffers(ctx);
        return ret;
}

static int coda_encode_header(struct coda_ctx *ctx, struct vb2_v4l2_buffer *buf,
                              int header_code, u8 *header, int *size)
{
        struct vb2_buffer *vb = &buf->vb2_buf;
        struct coda_dev *dev = ctx->dev;
        size_t bufsize;
        int ret;
        int i;

        if (dev->devtype->product == CODA_960)
                memset(vb2_plane_vaddr(vb, 0), 0, 64);

        coda_write(dev, vb2_dma_contig_plane_dma_addr(vb, 0),
                   CODA_CMD_ENC_HEADER_BB_START);
        bufsize = vb2_plane_size(vb, 0);
        if (dev->devtype->product == CODA_960)
                bufsize /= 1024;
        coda_write(dev, bufsize, CODA_CMD_ENC_HEADER_BB_SIZE);
        coda_write(dev, header_code, CODA_CMD_ENC_HEADER_CODE);
        ret = coda_command_sync(ctx, CODA_COMMAND_ENCODE_HEADER);
        if (ret < 0) {
                v4l2_err(&dev->v4l2_dev, "CODA_COMMAND_ENCODE_HEADER timeout\n");
                return ret;
        }

        if (dev->devtype->product == CODA_960) {
                for (i = 63; i > 0; i--)
                        if (((char *)vb2_plane_vaddr(vb, 0))[i] != 0)
                                break;
                *size = i + 1;
        } else {
                *size = coda_read(dev, CODA_REG_BIT_WR_PTR(ctx->reg_idx)) -
                        coda_read(dev, CODA_CMD_ENC_HEADER_BB_START);
        }
        memcpy(header, vb2_plane_vaddr(vb, 0), *size);

        return 0;
}

static phys_addr_t coda_iram_alloc(struct coda_iram_info *iram, size_t size)
{
        phys_addr_t ret;

        size = round_up(size, 1024);
        if (size > iram->remaining)
                return 0;
        iram->remaining -= size;

        ret = iram->next_paddr;
        iram->next_paddr += size;

        return ret;
}

static void coda_setup_iram(struct coda_ctx *ctx)
{
        struct coda_iram_info *iram_info = &ctx->iram_info;
        struct coda_dev *dev = ctx->dev;
        int w64, w128;
        int mb_width;
        int dbk_bits;
        int bit_bits;
        int ip_bits;

        memset(iram_info, 0, sizeof(*iram_info));
        iram_info->next_paddr = dev->iram.paddr;
        iram_info->remaining = dev->iram.size;

        if (!dev->iram.vaddr)
                return;

        switch (dev->devtype->product) {
        case CODA_7541:
                dbk_bits = CODA7_USE_HOST_DBK_ENABLE | CODA7_USE_DBK_ENABLE;
                bit_bits = CODA7_USE_HOST_BIT_ENABLE | CODA7_USE_BIT_ENABLE;
                ip_bits = CODA7_USE_HOST_IP_ENABLE | CODA7_USE_IP_ENABLE;
                break;
        case CODA_960:
                dbk_bits = CODA9_USE_HOST_DBK_ENABLE | CODA9_USE_DBK_ENABLE;
                bit_bits = CODA9_USE_HOST_BIT_ENABLE | CODA7_USE_BIT_ENABLE;
                ip_bits = CODA9_USE_HOST_IP_ENABLE | CODA7_USE_IP_ENABLE;
                break;
        default: /* CODA_DX6 */
                return;
        }

        if (ctx->inst_type == CODA_INST_ENCODER) {
                struct coda_q_data *q_data_src;

                q_data_src = get_q_data(ctx, V4L2_BUF_TYPE_VIDEO_OUTPUT);
                mb_width = DIV_ROUND_UP(q_data_src->width, 16);
                w128 = mb_width * 128;
                w64 = mb_width * 64;

                /* Prioritize in case IRAM is too small for everything */
                if (dev->devtype->product == CODA_7541) {
                        iram_info->search_ram_size = round_up(mb_width * 16 *
                                                              36 + 2048, 1024);
                        iram_info->search_ram_paddr = coda_iram_alloc(iram_info,
                                                iram_info->search_ram_size);
                        if (!iram_info->search_ram_paddr) {
                                pr_err("IRAM is smaller than the search ram size\n");
                                goto out;
                        }
                        iram_info->axi_sram_use |= CODA7_USE_HOST_ME_ENABLE |
                                                   CODA7_USE_ME_ENABLE;
                }

                /* Only H.264BP and H.263P3 are considered */
                iram_info->buf_dbk_y_use = coda_iram_alloc(iram_info, w64);
                iram_info->buf_dbk_c_use = coda_iram_alloc(iram_info, w64);
                if (!iram_info->buf_dbk_c_use)
                        goto out;
                iram_info->axi_sram_use |= dbk_bits;

                iram_info->buf_bit_use = coda_iram_alloc(iram_info, w128);
                if (!iram_info->buf_bit_use)
                        goto out;
                iram_info->axi_sram_use |= bit_bits;

                iram_info->buf_ip_ac_dc_use = coda_iram_alloc(iram_info, w128);
                if (!iram_info->buf_ip_ac_dc_use)
                        goto out;
                iram_info->axi_sram_use |= ip_bits;

                /* OVL and BTP disabled for encoder */
        } else if (ctx->inst_type == CODA_INST_DECODER) {
                struct coda_q_data *q_data_dst;

                q_data_dst = get_q_data(ctx, V4L2_BUF_TYPE_VIDEO_CAPTURE);
                mb_width = DIV_ROUND_UP(q_data_dst->width, 16);
                w128 = mb_width * 128;

                iram_info->buf_dbk_y_use = coda_iram_alloc(iram_info, w128);
                iram_info->buf_dbk_c_use = coda_iram_alloc(iram_info, w128);
                if (!iram_info->buf_dbk_c_use)
                        goto out;
                iram_info->axi_sram_use |= dbk_bits;

                iram_info->buf_bit_use = coda_iram_alloc(iram_info, w128);
                if (!iram_info->buf_bit_use)
                        goto out;
                iram_info->axi_sram_use |= bit_bits;

                iram_info->buf_ip_ac_dc_use = coda_iram_alloc(iram_info, w128);
                if (!iram_info->buf_ip_ac_dc_use)
                        goto out;
                iram_info->axi_sram_use |= ip_bits;

                /* OVL and BTP unused as there is no VC1 support yet */
        }

out:
        if (!(iram_info->axi_sram_use & CODA7_USE_HOST_IP_ENABLE))
                v4l2_dbg(1, coda_debug, &ctx->dev->v4l2_dev,
                         "IRAM smaller than needed\n");

        if (dev->devtype->product == CODA_7541) {
                /* TODO - Enabling these causes picture errors on CODA7541 */
                if (ctx->inst_type == CODA_INST_DECODER) {
                        /* fw 1.4.50 */
                        iram_info->axi_sram_use &= ~(CODA7_USE_HOST_IP_ENABLE |
                                                     CODA7_USE_IP_ENABLE);
                } else {
                        /* fw 13.4.29 */
                        iram_info->axi_sram_use &= ~(CODA7_USE_HOST_IP_ENABLE |
                                                     CODA7_USE_HOST_DBK_ENABLE |
                                                     CODA7_USE_IP_ENABLE |
                                                     CODA7_USE_DBK_ENABLE);
                }
        }
}

static u32 coda_supported_firmwares[] = {
        CODA_FIRMWARE_VERNUM(CODA_DX6, 2, 2, 5),
        CODA_FIRMWARE_VERNUM(CODA_7541, 1, 4, 50),
        CODA_FIRMWARE_VERNUM(CODA_960, 2, 1, 5),
};

static bool coda_firmware_supported(u32 vernum)
{
        int i;

        for (i = 0; i < ARRAY_SIZE(coda_supported_firmwares); i++)
                if (vernum == coda_supported_firmwares[i])
                        return true;
        return false;
}

int coda_check_firmware(struct coda_dev *dev)
{
        u16 product, major, minor, release;
        u32 data;
        int ret;

        ret = clk_prepare_enable(dev->clk_per);
        if (ret)
                goto err_clk_per;

        ret = clk_prepare_enable(dev->clk_ahb);
        if (ret)
                goto err_clk_ahb;

        coda_write(dev, 0, CODA_CMD_FIRMWARE_VERNUM);
        coda_write(dev, CODA_REG_BIT_BUSY_FLAG, CODA_REG_BIT_BUSY);
        coda_write(dev, 0, CODA_REG_BIT_RUN_INDEX);
        coda_write(dev, 0, CODA_REG_BIT_RUN_COD_STD);
        coda_write(dev, CODA_COMMAND_FIRMWARE_GET, CODA_REG_BIT_RUN_COMMAND);
        if (coda_wait_timeout(dev)) {
                v4l2_err(&dev->v4l2_dev, "firmware get command error\n");
                ret = -EIO;
                goto err_run_cmd;
        }

        if (dev->devtype->product == CODA_960) {
                data = coda_read(dev, CODA9_CMD_FIRMWARE_CODE_REV);
                v4l2_info(&dev->v4l2_dev, "Firmware code revision: %d\n",
                          data);
        }

        /* Check we are compatible with the loaded firmware */
        data = coda_read(dev, CODA_CMD_FIRMWARE_VERNUM);
        product = CODA_FIRMWARE_PRODUCT(data);
        major = CODA_FIRMWARE_MAJOR(data);
        minor = CODA_FIRMWARE_MINOR(data);
        release = CODA_FIRMWARE_RELEASE(data);

        clk_disable_unprepare(dev->clk_per);
        clk_disable_unprepare(dev->clk_ahb);

        if (product != dev->devtype->product) {
                v4l2_err(&dev->v4l2_dev,
                         "Wrong firmware. Hw: %s, Fw: %s, Version: %u.%u.%u\n",
                         coda_product_name(dev->devtype->product),
                         coda_product_name(product), major, minor, release);
                return -EINVAL;
        }

        v4l2_info(&dev->v4l2_dev, "Initialized %s.\n",
                  coda_product_name(product));

        if (coda_firmware_supported(data)) {
                v4l2_info(&dev->v4l2_dev, "Firmware version: %u.%u.%u\n",
                          major, minor, release);
        } else {
                v4l2_warn(&dev->v4l2_dev,
                          "Unsupported firmware version: %u.%u.%u\n",
                          major, minor, release);
        }

        return 0;

err_run_cmd:
        clk_disable_unprepare(dev->clk_ahb);
err_clk_ahb:
        clk_disable_unprepare(dev->clk_per);
err_clk_per:
        return ret;
}

static void coda9_set_frame_cache(struct coda_ctx *ctx, u32 fourcc)
{
        u32 cache_size, cache_config;

        if (ctx->tiled_map_type == GDI_LINEAR_FRAME_MAP) {
                /* Luma 2x0 page, 2x6 cache, chroma 2x0 page, 2x4 cache size */
                cache_size = 0x20262024;
                cache_config = 2 << CODA9_CACHE_PAGEMERGE_OFFSET;
        } else {
                /* Luma 0x2 page, 4x4 cache, chroma 0x2 page, 4x3 cache size */
                cache_size = 0x02440243;
                cache_config = 1 << CODA9_CACHE_PAGEMERGE_OFFSET;
        }
        coda_write(ctx->dev, cache_size, CODA9_CMD_SET_FRAME_CACHE_SIZE);
        if (fourcc == V4L2_PIX_FMT_NV12 || fourcc == V4L2_PIX_FMT_YUYV) {
                cache_config |= 32 << CODA9_CACHE_LUMA_BUFFER_SIZE_OFFSET |
                                16 << CODA9_CACHE_CR_BUFFER_SIZE_OFFSET |
                                0 << CODA9_CACHE_CB_BUFFER_SIZE_OFFSET;
        } else {
                cache_config |= 32 << CODA9_CACHE_LUMA_BUFFER_SIZE_OFFSET |
                                8 << CODA9_CACHE_CR_BUFFER_SIZE_OFFSET |
                                8 << CODA9_CACHE_CB_BUFFER_SIZE_OFFSET;
        }
        coda_write(ctx->dev, cache_config, CODA9_CMD_SET_FRAME_CACHE_CONFIG);
}

/*
 * Encoder context operations
 */

static int coda_encoder_reqbufs(struct coda_ctx *ctx,
                                struct v4l2_requestbuffers *rb)
{
        struct coda_q_data *q_data_src;
        int ret;

        if (rb->type != V4L2_BUF_TYPE_VIDEO_OUTPUT)
                return 0;

        if (rb->count) {
                q_data_src = get_q_data(ctx, V4L2_BUF_TYPE_VIDEO_OUTPUT);
                ret = coda_alloc_context_buffers(ctx, q_data_src);
                if (ret < 0)
                        return ret;
        } else {
                coda_free_context_buffers(ctx);
        }

        return 0;
}

static int coda_start_encoding(struct coda_ctx *ctx)
{
        struct coda_dev *dev = ctx->dev;
        struct v4l2_device *v4l2_dev = &dev->v4l2_dev;
        struct coda_q_data *q_data_src, *q_data_dst;
        u32 bitstream_buf, bitstream_size;
        struct vb2_v4l2_buffer *buf;
        int gamma, ret, value;
        u32 dst_fourcc;
        int num_fb;
        u32 stride;

        q_data_src = get_q_data(ctx, V4L2_BUF_TYPE_VIDEO_OUTPUT);
        q_data_dst = get_q_data(ctx, V4L2_BUF_TYPE_VIDEO_CAPTURE);
        dst_fourcc = q_data_dst->fourcc;

        buf = v4l2_m2m_next_dst_buf(ctx->fh.m2m_ctx);
        bitstream_buf = vb2_dma_contig_plane_dma_addr(&buf->vb2_buf, 0);
        bitstream_size = q_data_dst->sizeimage;

        if (!coda_is_initialized(dev)) {
                v4l2_err(v4l2_dev, "coda is not initialized.\n");
                return -EFAULT;
        }

        if (dst_fourcc == V4L2_PIX_FMT_JPEG) {
                if (!ctx->params.jpeg_qmat_tab[0])
                        ctx->params.jpeg_qmat_tab[0] = kmalloc(64, GFP_KERNEL);
                if (!ctx->params.jpeg_qmat_tab[1])
                        ctx->params.jpeg_qmat_tab[1] = kmalloc(64, GFP_KERNEL);
                coda_set_jpeg_compression_quality(ctx, ctx->params.jpeg_quality);
        }

        mutex_lock(&dev->coda_mutex);

        coda_write(dev, ctx->parabuf.paddr, CODA_REG_BIT_PARA_BUF_ADDR);
        coda_write(dev, bitstream_buf, CODA_REG_BIT_RD_PTR(ctx->reg_idx));
        coda_write(dev, bitstream_buf, CODA_REG_BIT_WR_PTR(ctx->reg_idx));
        switch (dev->devtype->product) {
        case CODA_DX6:
                coda_write(dev, CODADX6_STREAM_BUF_DYNALLOC_EN |
                        CODADX6_STREAM_BUF_PIC_RESET, CODA_REG_BIT_STREAM_CTRL);
                break;
        case CODA_960:
                coda_write(dev, 0, CODA9_GDI_WPROT_RGN_EN);
                /* fallthrough */
        case CODA_7541:
                coda_write(dev, CODA7_STREAM_BUF_DYNALLOC_EN |
                        CODA7_STREAM_BUF_PIC_RESET, CODA_REG_BIT_STREAM_CTRL);
                break;
        }

        ctx->frame_mem_ctrl &= ~(CODA_FRAME_CHROMA_INTERLEAVE | (0x3 << 9) |
                                 CODA9_FRAME_TILED2LINEAR);
        if (q_data_src->fourcc == V4L2_PIX_FMT_NV12)
                ctx->frame_mem_ctrl |= CODA_FRAME_CHROMA_INTERLEAVE;
        if (ctx->tiled_map_type == GDI_TILED_FRAME_MB_RASTER_MAP)
                ctx->frame_mem_ctrl |= (0x3 << 9) | CODA9_FRAME_TILED2LINEAR;
        coda_write(dev, ctx->frame_mem_ctrl, CODA_REG_BIT_FRAME_MEM_CTRL);

        if (dev->devtype->product == CODA_DX6) {
                /* Configure the coda */
                coda_write(dev, dev->iram.paddr,
                           CODADX6_REG_BIT_SEARCH_RAM_BASE_ADDR);
        }

        /* Could set rotation here if needed */
        value = 0;
        switch (dev->devtype->product) {
        case CODA_DX6:
                value = (q_data_src->width & CODADX6_PICWIDTH_MASK)
                        << CODADX6_PICWIDTH_OFFSET;
                value |= (q_data_src->height & CODADX6_PICHEIGHT_MASK)
                         << CODA_PICHEIGHT_OFFSET;
                break;
        case CODA_7541:
                if (dst_fourcc == V4L2_PIX_FMT_H264) {
                        value = (round_up(q_data_src->width, 16) &
                                 CODA7_PICWIDTH_MASK) << CODA7_PICWIDTH_OFFSET;
                        value |= (round_up(q_data_src->height, 16) &
                                 CODA7_PICHEIGHT_MASK) << CODA_PICHEIGHT_OFFSET;
                        break;
                }
                /* fallthrough */
        case CODA_960:
                value = (q_data_src->width & CODA7_PICWIDTH_MASK)
                        << CODA7_PICWIDTH_OFFSET;
                value |= (q_data_src->height & CODA7_PICHEIGHT_MASK)
                         << CODA_PICHEIGHT_OFFSET;
        }
        coda_write(dev, value, CODA_CMD_ENC_SEQ_SRC_SIZE);
        if (dst_fourcc == V4L2_PIX_FMT_JPEG)
                ctx->params.framerate = 0;
        coda_write(dev, ctx->params.framerate,
                   CODA_CMD_ENC_SEQ_SRC_F_RATE);

        ctx->params.codec_mode = ctx->codec->mode;
        switch (dst_fourcc) {
        case V4L2_PIX_FMT_MPEG4:
                if (dev->devtype->product == CODA_960)
                        coda_write(dev, CODA9_STD_MPEG4,
                                   CODA_CMD_ENC_SEQ_COD_STD);
                else
                        coda_write(dev, CODA_STD_MPEG4,
                                   CODA_CMD_ENC_SEQ_COD_STD);
                coda_write(dev, 0, CODA_CMD_ENC_SEQ_MP4_PARA);
                break;
        case V4L2_PIX_FMT_H264:
                if (dev->devtype->product == CODA_960)
                        coda_write(dev, CODA9_STD_H264,
                                   CODA_CMD_ENC_SEQ_COD_STD);
                else
                        coda_write(dev, CODA_STD_H264,
                                   CODA_CMD_ENC_SEQ_COD_STD);
                if (ctx->params.h264_deblk_enabled) {
                        value = ((ctx->params.h264_deblk_alpha &
                                  CODA_264PARAM_DEBLKFILTEROFFSETALPHA_MASK) <<
                                 CODA_264PARAM_DEBLKFILTEROFFSETALPHA_OFFSET) |
                                ((ctx->params.h264_deblk_beta &
                                  CODA_264PARAM_DEBLKFILTEROFFSETBETA_MASK) <<
                                 CODA_264PARAM_DEBLKFILTEROFFSETBETA_OFFSET);
                } else {
                        value = 1 << CODA_264PARAM_DISABLEDEBLK_OFFSET;
                }
                coda_write(dev, value, CODA_CMD_ENC_SEQ_264_PARA);
                break;
        case V4L2_PIX_FMT_JPEG:
                coda_write(dev, 0, CODA_CMD_ENC_SEQ_JPG_PARA);
                coda_write(dev, ctx->params.jpeg_restart_interval,
                                CODA_CMD_ENC_SEQ_JPG_RST_INTERVAL);
                coda_write(dev, 0, CODA_CMD_ENC_SEQ_JPG_THUMB_EN);
                coda_write(dev, 0, CODA_CMD_ENC_SEQ_JPG_THUMB_SIZE);
                coda_write(dev, 0, CODA_CMD_ENC_SEQ_JPG_THUMB_OFFSET);

                coda_jpeg_write_tables(ctx);
                break;
        default:
                v4l2_err(v4l2_dev,
                         "dst format (0x%08x) invalid.\n", dst_fourcc);
                ret = -EINVAL;
                goto out;
        }

        /*
         * slice mode and GOP size registers are used for thumb size/offset
         * in JPEG mode
         */
        if (dst_fourcc != V4L2_PIX_FMT_JPEG) {
                switch (ctx->params.slice_mode) {
                case V4L2_MPEG_VIDEO_MULTI_SLICE_MODE_SINGLE:
                        value = 0;
                        break;
                case V4L2_MPEG_VIDEO_MULTI_SICE_MODE_MAX_MB:
                        value  = (ctx->params.slice_max_mb &
                                  CODA_SLICING_SIZE_MASK)
                                 << CODA_SLICING_SIZE_OFFSET;
                        value |= (1 & CODA_SLICING_UNIT_MASK)
                                 << CODA_SLICING_UNIT_OFFSET;
                        value |=  1 & CODA_SLICING_MODE_MASK;
                        break;
                case V4L2_MPEG_VIDEO_MULTI_SICE_MODE_MAX_BYTES:
                        value  = (ctx->params.slice_max_bits &
                                  CODA_SLICING_SIZE_MASK)
                                 << CODA_SLICING_SIZE_OFFSET;
                        value |= (0 & CODA_SLICING_UNIT_MASK)
                                 << CODA_SLICING_UNIT_OFFSET;
                        value |=  1 & CODA_SLICING_MODE_MASK;
                        break;
                }
                coda_write(dev, value, CODA_CMD_ENC_SEQ_SLICE_MODE);
                value = ctx->params.gop_size & CODA_GOP_SIZE_MASK;
                coda_write(dev, value, CODA_CMD_ENC_SEQ_GOP_SIZE);
        }

        if (ctx->params.bitrate) {
                /* Rate control enabled */
                value = (ctx->params.bitrate & CODA_RATECONTROL_BITRATE_MASK)
                        << CODA_RATECONTROL_BITRATE_OFFSET;
                value |=  1 & CODA_RATECONTROL_ENABLE_MASK;
                value |= (ctx->params.vbv_delay &
                          CODA_RATECONTROL_INITIALDELAY_MASK)
                         << CODA_RATECONTROL_INITIALDELAY_OFFSET;
                if (dev->devtype->product == CODA_960)
                        value |= BIT(31); /* disable autoskip */
        } else {
                value = 0;
        }
        coda_write(dev, value, CODA_CMD_ENC_SEQ_RC_PARA);

        coda_write(dev, ctx->params.vbv_size, CODA_CMD_ENC_SEQ_RC_BUF_SIZE);
        coda_write(dev, ctx->params.intra_refresh,
                   CODA_CMD_ENC_SEQ_INTRA_REFRESH);

        coda_write(dev, bitstream_buf, CODA_CMD_ENC_SEQ_BB_START);
        coda_write(dev, bitstream_size / 1024, CODA_CMD_ENC_SEQ_BB_SIZE);


        value = 0;
        if (dev->devtype->product == CODA_960)
                gamma = CODA9_DEFAULT_GAMMA;
        else
                gamma = CODA_DEFAULT_GAMMA;

        if (gamma > 0) {
                coda_write(dev, (gamma & CODA_GAMMA_MASK) << CODA_GAMMA_OFFSET,
                           CODA_CMD_ENC_SEQ_RC_GAMMA);
        }

        if (ctx->params.h264_min_qp || ctx->params.h264_max_qp) {
                coda_write(dev,
                           ctx->params.h264_min_qp << CODA_QPMIN_OFFSET |
                           ctx->params.h264_max_qp << CODA_QPMAX_OFFSET,
                           CODA_CMD_ENC_SEQ_RC_QP_MIN_MAX);
        }
        if (dev->devtype->product == CODA_960) {
                if (ctx->params.h264_max_qp)
                        value |= 1 << CODA9_OPTION_RCQPMAX_OFFSET;
                if (CODA_DEFAULT_GAMMA > 0)
                        value |= 1 << CODA9_OPTION_GAMMA_OFFSET;
        } else {
                if (CODA_DEFAULT_GAMMA > 0) {
                        if (dev->devtype->product == CODA_DX6)
                                value |= 1 << CODADX6_OPTION_GAMMA_OFFSET;
                        else
                                value |= 1 << CODA7_OPTION_GAMMA_OFFSET;
                }
                if (ctx->params.h264_min_qp)
                        value |= 1 << CODA7_OPTION_RCQPMIN_OFFSET;
                if (ctx->params.h264_max_qp)
                        value |= 1 << CODA7_OPTION_RCQPMAX_OFFSET;
        }
        coda_write(dev, value, CODA_CMD_ENC_SEQ_OPTION);

        coda_write(dev, 0, CODA_CMD_ENC_SEQ_RC_INTERVAL_MODE);

        coda_setup_iram(ctx);

        if (dst_fourcc == V4L2_PIX_FMT_H264) {
                switch (dev->devtype->product) {
                case CODA_DX6:
                        value = FMO_SLICE_SAVE_BUF_SIZE << 7;
                        coda_write(dev, value, CODADX6_CMD_ENC_SEQ_FMO);
                        break;
                case CODA_7541:
                        coda_write(dev, ctx->iram_info.search_ram_paddr,
                                        CODA7_CMD_ENC_SEQ_SEARCH_BASE);
                        coda_write(dev, ctx->iram_info.search_ram_size,
                                        CODA7_CMD_ENC_SEQ_SEARCH_SIZE);
                        break;
                case CODA_960:
                        coda_write(dev, 0, CODA9_CMD_ENC_SEQ_ME_OPTION);
                        coda_write(dev, 0, CODA9_CMD_ENC_SEQ_INTRA_WEIGHT);
                }
        }

        ret = coda_command_sync(ctx, CODA_COMMAND_SEQ_INIT);
        if (ret < 0) {
                v4l2_err(v4l2_dev, "CODA_COMMAND_SEQ_INIT timeout\n");
                goto out;
        }

        if (coda_read(dev, CODA_RET_ENC_SEQ_SUCCESS) == 0) {
                v4l2_err(v4l2_dev, "CODA_COMMAND_SEQ_INIT failed\n");
                ret = -EFAULT;
                goto out;
        }
        ctx->initialized = 1;

        if (dst_fourcc != V4L2_PIX_FMT_JPEG) {
                if (dev->devtype->product == CODA_960)
                        ctx->num_internal_frames = 4;
                else
                        ctx->num_internal_frames = 2;
                ret = coda_alloc_framebuffers(ctx, q_data_src, dst_fourcc);
                if (ret < 0) {
                        v4l2_err(v4l2_dev, "failed to allocate framebuffers\n");
                        goto out;
                }
                num_fb = 2;
                stride = q_data_src->bytesperline;
        } else {
                ctx->num_internal_frames = 0;
                num_fb = 0;
                stride = 0;
        }
        coda_write(dev, num_fb, CODA_CMD_SET_FRAME_BUF_NUM);
        coda_write(dev, stride, CODA_CMD_SET_FRAME_BUF_STRIDE);

        if (dev->devtype->product == CODA_7541) {
                coda_write(dev, q_data_src->bytesperline,
                                CODA7_CMD_SET_FRAME_SOURCE_BUF_STRIDE);
        }
        if (dev->devtype->product != CODA_DX6) {
                coda_write(dev, ctx->iram_info.buf_bit_use,
                                CODA7_CMD_SET_FRAME_AXI_BIT_ADDR);
                coda_write(dev, ctx->iram_info.buf_ip_ac_dc_use,
                                CODA7_CMD_SET_FRAME_AXI_IPACDC_ADDR);
                coda_write(dev, ctx->iram_info.buf_dbk_y_use,
                                CODA7_CMD_SET_FRAME_AXI_DBKY_ADDR);
                coda_write(dev, ctx->iram_info.buf_dbk_c_use,
                                CODA7_CMD_SET_FRAME_AXI_DBKC_ADDR);
                coda_write(dev, ctx->iram_info.buf_ovl_use,
                                CODA7_CMD_SET_FRAME_AXI_OVL_ADDR);
                if (dev->devtype->product == CODA_960) {
                        coda_write(dev, ctx->iram_info.buf_btp_use,
                                        CODA9_CMD_SET_FRAME_AXI_BTP_ADDR);

                        coda9_set_frame_cache(ctx, q_data_src->fourcc);

                        /* FIXME */
                        coda_write(dev, ctx->internal_frames[2].paddr,
                                   CODA9_CMD_SET_FRAME_SUBSAMP_A);
                        coda_write(dev, ctx->internal_frames[3].paddr,
                                   CODA9_CMD_SET_FRAME_SUBSAMP_B);
                }
        }

        ret = coda_command_sync(ctx, CODA_COMMAND_SET_FRAME_BUF);
        if (ret < 0) {
                v4l2_err(v4l2_dev, "CODA_COMMAND_SET_FRAME_BUF timeout\n");
                goto out;
        }

        /* Save stream headers */
        buf = v4l2_m2m_next_dst_buf(ctx->fh.m2m_ctx);
        switch (dst_fourcc) {
        case V4L2_PIX_FMT_H264:
                /*
                 * Get SPS in the first frame and copy it to an
                 * intermediate buffer.
                 */
                ret = coda_encode_header(ctx, buf, CODA_HEADER_H264_SPS,
                                         &ctx->vpu_header[0][0],
                                         &ctx->vpu_header_size[0]);
                if (ret < 0)
                        goto out;

                /*
                 * Get PPS in the first frame and copy it to an
                 * intermediate buffer.
                 */
                ret = coda_encode_header(ctx, buf, CODA_HEADER_H264_PPS,
                                         &ctx->vpu_header[1][0],
                                         &ctx->vpu_header_size[1]);
                if (ret < 0)
                        goto out;

                /*
                 * Length of H.264 headers is variable and thus it might not be
                 * aligned for the coda to append the encoded frame. In that is
                 * the case a filler NAL must be added to header 2.
                 */
                ctx->vpu_header_size[2] = coda_h264_padding(
                                        (ctx->vpu_header_size[0] +
                                         ctx->vpu_header_size[1]),
                                         ctx->vpu_header[2]);
                break;
        case V4L2_PIX_FMT_MPEG4:
                /*
                 * Get VOS in the first frame and copy it to an
                 * intermediate buffer
                 */
                ret = coda_encode_header(ctx, buf, CODA_HEADER_MP4V_VOS,
                                         &ctx->vpu_header[0][0],
                                         &ctx->vpu_header_size[0]);
                if (ret < 0)
                        goto out;

                ret = coda_encode_header(ctx, buf, CODA_HEADER_MP4V_VIS,
                                         &ctx->vpu_header[1][0],
                                         &ctx->vpu_header_size[1]);
                if (ret < 0)
                        goto out;

                ret = coda_encode_header(ctx, buf, CODA_HEADER_MP4V_VOL,
                                         &ctx->vpu_header[2][0],
                                         &ctx->vpu_header_size[2]);
                if (ret < 0)
                        goto out;
                break;
        default:
                /* No more formats need to save headers at the moment */
                break;
        }

out:
        mutex_unlock(&dev->coda_mutex);
        return ret;
}

static int coda_prepare_encode(struct coda_ctx *ctx)
{
        struct coda_q_data *q_data_src, *q_data_dst;
        struct vb2_v4l2_buffer *src_buf, *dst_buf;
        struct coda_dev *dev = ctx->dev;
        int force_ipicture;
        int quant_param = 0;
        u32 pic_stream_buffer_addr, pic_stream_buffer_size;
        u32 rot_mode = 0;
        u32 dst_fourcc;
        u32 reg;

        src_buf = v4l2_m2m_next_src_buf(ctx->fh.m2m_ctx);
        dst_buf = v4l2_m2m_next_dst_buf(ctx->fh.m2m_ctx);
        q_data_src = get_q_data(ctx, V4L2_BUF_TYPE_VIDEO_OUTPUT);
        q_data_dst = get_q_data(ctx, V4L2_BUF_TYPE_VIDEO_CAPTURE);
        dst_fourcc = q_data_dst->fourcc;

        src_buf->sequence = ctx->osequence;
        dst_buf->sequence = ctx->osequence;
        ctx->osequence++;

        /*
         * Workaround coda firmware BUG that only marks the first
         * frame as IDR. This is a problem for some decoders that can't
         * recover when a frame is lost.
         */
        if (src_buf->sequence % ctx->params.gop_size) {
                src_buf->flags |= V4L2_BUF_FLAG_PFRAME;
                src_buf->flags &= ~V4L2_BUF_FLAG_KEYFRAME;
        } else {
                src_buf->flags |= V4L2_BUF_FLAG_KEYFRAME;
                src_buf->flags &= ~V4L2_BUF_FLAG_PFRAME;
        }

        if (dev->devtype->product == CODA_960)
                coda_set_gdi_regs(ctx);

        /*
         * Copy headers at the beginning of the first frame for H.264 only.
         * In MPEG4 they are already copied by the coda.
         */
        if (src_buf->sequence == 0) {
                pic_stream_buffer_addr =
                        vb2_dma_contig_plane_dma_addr(&dst_buf->vb2_buf, 0) +
                        ctx->vpu_header_size[0] +
                        ctx->vpu_header_size[1] +
                        ctx->vpu_header_size[2];
                pic_stream_buffer_size = q_data_dst->sizeimage -
                        ctx->vpu_header_size[0] -
                        ctx->vpu_header_size[1] -
                        ctx->vpu_header_size[2];
                memcpy(vb2_plane_vaddr(&dst_buf->vb2_buf, 0),
                       &ctx->vpu_header[0][0], ctx->vpu_header_size[0]);
                memcpy(vb2_plane_vaddr(&dst_buf->vb2_buf, 0)
                        + ctx->vpu_header_size[0], &ctx->vpu_header[1][0],
                        ctx->vpu_header_size[1]);
                memcpy(vb2_plane_vaddr(&dst_buf->vb2_buf, 0)
                        + ctx->vpu_header_size[0] + ctx->vpu_header_size[1],
                        &ctx->vpu_header[2][0], ctx->vpu_header_size[2]);
        } else {
                pic_stream_buffer_addr =
                        vb2_dma_contig_plane_dma_addr(&dst_buf->vb2_buf, 0);
                pic_stream_buffer_size = q_data_dst->sizeimage;
        }

        if (src_buf->flags & V4L2_BUF_FLAG_KEYFRAME) {
                force_ipicture = 1;
                switch (dst_fourcc) {
                case V4L2_PIX_FMT_H264:
                        quant_param = ctx->params.h264_intra_qp;
                        break;
                case V4L2_PIX_FMT_MPEG4:
                        quant_param = ctx->params.mpeg4_intra_qp;
                        break;
                case V4L2_PIX_FMT_JPEG:
                        quant_param = 30;
                        break;
                default:
                        v4l2_warn(&ctx->dev->v4l2_dev,
                                "cannot set intra qp, fmt not supported\n");
                        break;
                }
        } else {
                force_ipicture = 0;
                switch (dst_fourcc) {
                case V4L2_PIX_FMT_H264:
                        quant_param = ctx->params.h264_inter_qp;
                        break;
                case V4L2_PIX_FMT_MPEG4:
                        quant_param = ctx->params.mpeg4_inter_qp;
                        break;
                default:
                        v4l2_warn(&ctx->dev->v4l2_dev,
                                "cannot set inter qp, fmt not supported\n");
                        break;
                }
        }

        /* submit */
        if (ctx->params.rot_mode)
                rot_mode = CODA_ROT_MIR_ENABLE | ctx->params.rot_mode;
        coda_write(dev, rot_mode, CODA_CMD_ENC_PIC_ROT_MODE);
        coda_write(dev, quant_param, CODA_CMD_ENC_PIC_QS);

        if (dev->devtype->product == CODA_960) {
                coda_write(dev, 4/*FIXME: 0*/, CODA9_CMD_ENC_PIC_SRC_INDEX);
                coda_write(dev, q_data_src->width, CODA9_CMD_ENC_PIC_SRC_STRIDE);
                coda_write(dev, 0, CODA9_CMD_ENC_PIC_SUB_FRAME_SYNC);

                reg = CODA9_CMD_ENC_PIC_SRC_ADDR_Y;
        } else {
                reg = CODA_CMD_ENC_PIC_SRC_ADDR_Y;
        }
        coda_write_base(ctx, q_data_src, src_buf, reg);

        coda_write(dev, force_ipicture << 1 & 0x2,
                   CODA_CMD_ENC_PIC_OPTION);

        coda_write(dev, pic_stream_buffer_addr, CODA_CMD_ENC_PIC_BB_START);
        coda_write(dev, pic_stream_buffer_size / 1024,
                   CODA_CMD_ENC_PIC_BB_SIZE);

        if (!ctx->streamon_out) {
                /* After streamoff on the output side, set stream end flag */
                ctx->bit_stream_param |= CODA_BIT_STREAM_END_FLAG;
                coda_write(dev, ctx->bit_stream_param,
                           CODA_REG_BIT_BIT_STREAM_PARAM);
        }

        if (dev->devtype->product != CODA_DX6)
                coda_write(dev, ctx->iram_info.axi_sram_use,
                                CODA7_REG_BIT_AXI_SRAM_USE);

        trace_coda_enc_pic_run(ctx, src_buf);

        coda_command_async(ctx, CODA_COMMAND_PIC_RUN);

        return 0;
}

static void coda_finish_encode(struct coda_ctx *ctx)
{
        struct vb2_v4l2_buffer *src_buf, *dst_buf;
        struct coda_dev *dev = ctx->dev;
        u32 wr_ptr, start_ptr;

        src_buf = v4l2_m2m_src_buf_remove(ctx->fh.m2m_ctx);
        dst_buf = v4l2_m2m_next_dst_buf(ctx->fh.m2m_ctx);

        trace_coda_enc_pic_done(ctx, dst_buf);

        /* Get results from the coda */
        start_ptr = coda_read(dev, CODA_CMD_ENC_PIC_BB_START);
        wr_ptr = coda_read(dev, CODA_REG_BIT_WR_PTR(ctx->reg_idx));

        /* Calculate bytesused field */
        if (dst_buf->sequence == 0) {
                vb2_set_plane_payload(&dst_buf->vb2_buf, 0, wr_ptr - start_ptr +
                                        ctx->vpu_header_size[0] +
                                        ctx->vpu_header_size[1] +
                                        ctx->vpu_header_size[2]);
        } else {
                vb2_set_plane_payload(&dst_buf->vb2_buf, 0, wr_ptr - start_ptr);
        }

        v4l2_dbg(1, coda_debug, &ctx->dev->v4l2_dev, "frame size = %u\n",
                 wr_ptr - start_ptr);

        coda_read(dev, CODA_RET_ENC_PIC_SLICE_NUM);
        coda_read(dev, CODA_RET_ENC_PIC_FLAG);

        if (coda_read(dev, CODA_RET_ENC_PIC_TYPE) == 0) {
                dst_buf->flags |= V4L2_BUF_FLAG_KEYFRAME;
                dst_buf->flags &= ~V4L2_BUF_FLAG_PFRAME;
        } else {
                dst_buf->flags |= V4L2_BUF_FLAG_PFRAME;
                dst_buf->flags &= ~V4L2_BUF_FLAG_KEYFRAME;
        }

        dst_buf->vb2_buf.timestamp = src_buf->vb2_buf.timestamp;
        dst_buf->flags &= ~V4L2_BUF_FLAG_TSTAMP_SRC_MASK;
        dst_buf->flags |=
                src_buf->flags & V4L2_BUF_FLAG_TSTAMP_SRC_MASK;
        dst_buf->timecode = src_buf->timecode;

        v4l2_m2m_buf_done(src_buf, VB2_BUF_STATE_DONE);

        dst_buf = v4l2_m2m_dst_buf_remove(ctx->fh.m2m_ctx);
        coda_m2m_buf_done(ctx, dst_buf, VB2_BUF_STATE_DONE);

        ctx->gopcounter--;
        if (ctx->gopcounter < 0)
                ctx->gopcounter = ctx->params.gop_size - 1;

        v4l2_dbg(1, coda_debug, &dev->v4l2_dev,
                "job finished: encoding frame (%d) (%s)\n",
                dst_buf->sequence,
                (dst_buf->flags & V4L2_BUF_FLAG_KEYFRAME) ?
                "KEYFRAME" : "PFRAME");
}

static void coda_seq_end_work(struct work_struct *work)
{
        struct coda_ctx *ctx = container_of(work, struct coda_ctx, seq_end_work);
        struct coda_dev *dev = ctx->dev;

        mutex_lock(&ctx->buffer_mutex);
        mutex_lock(&dev->coda_mutex);

        if (ctx->initialized == 0)
                goto out;

        v4l2_dbg(1, coda_debug, &dev->v4l2_dev,
                 "%d: %s: sent command 'SEQ_END' to coda\n", ctx->idx,
                 __func__);
        if (coda_command_sync(ctx, CODA_COMMAND_SEQ_END)) {
                v4l2_err(&dev->v4l2_dev,
                         "CODA_COMMAND_SEQ_END failed\n");
        }

        /*
         * FIXME: Sometimes h.264 encoding fails with 8-byte sequences missing
         * from the output stream after the h.264 decoder has run. Resetting the
         * hardware after the decoder has finished seems to help.
         */
        if (dev->devtype->product == CODA_960)
                coda_hw_reset(ctx);

        kfifo_init(&ctx->bitstream_fifo,
                ctx->bitstream.vaddr, ctx->bitstream.size);

        coda_free_framebuffers(ctx);

        ctx->initialized = 0;

out:
        mutex_unlock(&dev->coda_mutex);
        mutex_unlock(&ctx->buffer_mutex);
}

static void coda_bit_release(struct coda_ctx *ctx)
{
        mutex_lock(&ctx->buffer_mutex);
        coda_free_framebuffers(ctx);
        coda_free_context_buffers(ctx);
        coda_free_bitstream_buffer(ctx);
        mutex_unlock(&ctx->buffer_mutex);
}

const struct coda_context_ops coda_bit_encode_ops = {
        .queue_init = coda_encoder_queue_init,
        .reqbufs = coda_encoder_reqbufs,
        .start_streaming = coda_start_encoding,
        .prepare_run = coda_prepare_encode,
        .finish_run = coda_finish_encode,
        .seq_end_work = coda_seq_end_work,
        .release = coda_bit_release,
};

/*
 * Decoder context operations
 */

static int coda_alloc_bitstream_buffer(struct coda_ctx *ctx,
                                       struct coda_q_data *q_data)
{
        if (ctx->bitstream.vaddr)
                return 0;

        ctx->bitstream.size = roundup_pow_of_two(q_data->sizeimage * 2);
        ctx->bitstream.vaddr = dma_alloc_wc(&ctx->dev->plat_dev->dev,
                                            ctx->bitstream.size,
                                            &ctx->bitstream.paddr, GFP_KERNEL);
        if (!ctx->bitstream.vaddr) {
                v4l2_err(&ctx->dev->v4l2_dev,
                         "failed to allocate bitstream ringbuffer");
                return -ENOMEM;
        }
        kfifo_init(&ctx->bitstream_fifo,
                   ctx->bitstream.vaddr, ctx->bitstream.size);

        return 0;
}

static void coda_free_bitstream_buffer(struct coda_ctx *ctx)
{
        if (ctx->bitstream.vaddr == NULL)
                return;

        dma_free_wc(&ctx->dev->plat_dev->dev, ctx->bitstream.size,
                    ctx->bitstream.vaddr, ctx->bitstream.paddr);
        ctx->bitstream.vaddr = NULL;
        kfifo_init(&ctx->bitstream_fifo, NULL, 0);
}

static int coda_decoder_reqbufs(struct coda_ctx *ctx,
                                struct v4l2_requestbuffers *rb)
{
        struct coda_q_data *q_data_src;
        int ret;

        if (rb->type != V4L2_BUF_TYPE_VIDEO_OUTPUT)
                return 0;

        if (rb->count) {
                q_data_src = get_q_data(ctx, V4L2_BUF_TYPE_VIDEO_OUTPUT);
                ret = coda_alloc_context_buffers(ctx, q_data_src);
                if (ret < 0)
                        return ret;
                ret = coda_alloc_bitstream_buffer(ctx, q_data_src);
                if (ret < 0) {
                        coda_free_context_buffers(ctx);
                        return ret;
                }
        } else {
                coda_free_bitstream_buffer(ctx);
                coda_free_context_buffers(ctx);
        }

        return 0;
}

static int __coda_start_decoding(struct coda_ctx *ctx)
{
        struct coda_q_data *q_data_src, *q_data_dst;
        u32 bitstream_buf, bitstream_size;
        struct coda_dev *dev = ctx->dev;
        int width, height;
        u32 src_fourcc, dst_fourcc;
        u32 val;
        int ret;

        v4l2_dbg(1, coda_debug, &dev->v4l2_dev,
                 "Video Data Order Adapter: %s\n",
                 ctx->use_vdoa ? "Enabled" : "Disabled");

        /* Start decoding */
        q_data_src = get_q_data(ctx, V4L2_BUF_TYPE_VIDEO_OUTPUT);
        q_data_dst = get_q_data(ctx, V4L2_BUF_TYPE_VIDEO_CAPTURE);
        bitstream_buf = ctx->bitstream.paddr;
        bitstream_size = ctx->bitstream.size;
        src_fourcc = q_data_src->fourcc;
        dst_fourcc = q_data_dst->fourcc;

        coda_write(dev, ctx->parabuf.paddr, CODA_REG_BIT_PARA_BUF_ADDR);

        /* Update coda bitstream read and write pointers from kfifo */
        coda_kfifo_sync_to_device_full(ctx);

        ctx->frame_mem_ctrl &= ~(CODA_FRAME_CHROMA_INTERLEAVE | (0x3 << 9) |
                                 CODA9_FRAME_TILED2LINEAR);
        if (dst_fourcc == V4L2_PIX_FMT_NV12 || dst_fourcc == V4L2_PIX_FMT_YUYV)
                ctx->frame_mem_ctrl |= CODA_FRAME_CHROMA_INTERLEAVE;
        if (ctx->tiled_map_type == GDI_TILED_FRAME_MB_RASTER_MAP)
                ctx->frame_mem_ctrl |= (0x3 << 9) |
                        ((ctx->use_vdoa) ? 0 : CODA9_FRAME_TILED2LINEAR);
        coda_write(dev, ctx->frame_mem_ctrl, CODA_REG_BIT_FRAME_MEM_CTRL);

        ctx->display_idx = -1;
        ctx->frm_dis_flg = 0;
        coda_write(dev, 0, CODA_REG_BIT_FRM_DIS_FLG(ctx->reg_idx));

        coda_write(dev, CODA_BIT_DEC_SEQ_INIT_ESCAPE,
                        CODA_REG_BIT_BIT_STREAM_PARAM);

        coda_write(dev, bitstream_buf, CODA_CMD_DEC_SEQ_BB_START);
        coda_write(dev, bitstream_size / 1024, CODA_CMD_DEC_SEQ_BB_SIZE);
        val = 0;
        if ((dev->devtype->product == CODA_7541) ||
            (dev->devtype->product == CODA_960))
                val |= CODA_REORDER_ENABLE;
        if (ctx->codec->src_fourcc == V4L2_PIX_FMT_JPEG)
                val |= CODA_NO_INT_ENABLE;
        coda_write(dev, val, CODA_CMD_DEC_SEQ_OPTION);

        ctx->params.codec_mode = ctx->codec->mode;
        if (dev->devtype->product == CODA_960 &&
            src_fourcc == V4L2_PIX_FMT_MPEG4)
                ctx->params.codec_mode_aux = CODA_MP4_AUX_MPEG4;
        else
                ctx->params.codec_mode_aux = 0;
        if (src_fourcc == V4L2_PIX_FMT_H264) {
                if (dev->devtype->product == CODA_7541) {
                        coda_write(dev, ctx->psbuf.paddr,
                                        CODA_CMD_DEC_SEQ_PS_BB_START);
                        coda_write(dev, (CODA7_PS_BUF_SIZE / 1024),
                                        CODA_CMD_DEC_SEQ_PS_BB_SIZE);
                }
                if (dev->devtype->product == CODA_960) {
                        coda_write(dev, 0, CODA_CMD_DEC_SEQ_X264_MV_EN);
                        coda_write(dev, 512, CODA_CMD_DEC_SEQ_SPP_CHUNK_SIZE);
                }
        }
        if (dev->devtype->product != CODA_960)
                coda_write(dev, 0, CODA_CMD_DEC_SEQ_SRC_SIZE);

        if (coda_command_sync(ctx, CODA_COMMAND_SEQ_INIT)) {
                v4l2_err(&dev->v4l2_dev, "CODA_COMMAND_SEQ_INIT timeout\n");
                coda_write(dev, 0, CODA_REG_BIT_BIT_STREAM_PARAM);
                return -ETIMEDOUT;
        }
        ctx->initialized = 1;

        /* Update kfifo out pointer from coda bitstream read pointer */
        coda_kfifo_sync_from_device(ctx);

        coda_write(dev, 0, CODA_REG_BIT_BIT_STREAM_PARAM);

        if (coda_read(dev, CODA_RET_DEC_SEQ_SUCCESS) == 0) {
                v4l2_err(&dev->v4l2_dev,
                        "CODA_COMMAND_SEQ_INIT failed, error code = %d\n",
                        coda_read(dev, CODA_RET_DEC_SEQ_ERR_REASON));
                return -EAGAIN;
        }

        val = coda_read(dev, CODA_RET_DEC_SEQ_SRC_SIZE);
        if (dev->devtype->product == CODA_DX6) {
                width = (val >> CODADX6_PICWIDTH_OFFSET) & CODADX6_PICWIDTH_MASK;
                height = val & CODADX6_PICHEIGHT_MASK;
        } else {
                width = (val >> CODA7_PICWIDTH_OFFSET) & CODA7_PICWIDTH_MASK;
                height = val & CODA7_PICHEIGHT_MASK;
        }

        if (width > q_data_dst->bytesperline || height > q_data_dst->height) {
                v4l2_err(&dev->v4l2_dev, "stream is %dx%d, not %dx%d\n",
                         width, height, q_data_dst->bytesperline,
                         q_data_dst->height);
                return -EINVAL;
        }

        width = round_up(width, 16);
        height = round_up(height, 16);

        v4l2_dbg(1, coda_debug, &dev->v4l2_dev, "%s instance %d now: %dx%d\n",
                 __func__, ctx->idx, width, height);

        ctx->num_internal_frames = coda_read(dev, CODA_RET_DEC_SEQ_FRAME_NEED);
        /*
         * If the VDOA is used, the decoder needs one additional frame,
         * because the frames are freed when the next frame is decoded.
         * Otherwise there are visible errors in the decoded frames (green
         * regions in displayed frames) and a broken order of frames (earlier
         * frames are sporadically displayed after later frames).
         */
        if (ctx->use_vdoa)
                ctx->num_internal_frames += 1;
        if (ctx->num_internal_frames > CODA_MAX_FRAMEBUFFERS) {
                v4l2_err(&dev->v4l2_dev,
                         "not enough framebuffers to decode (%d < %d)\n",
                         CODA_MAX_FRAMEBUFFERS, ctx->num_internal_frames);
                return -EINVAL;
        }

        if (src_fourcc == V4L2_PIX_FMT_H264) {
                u32 left_right;
                u32 top_bottom;

                left_right = coda_read(dev, CODA_RET_DEC_SEQ_CROP_LEFT_RIGHT);
                top_bottom = coda_read(dev, CODA_RET_DEC_SEQ_CROP_TOP_BOTTOM);

                q_data_dst->rect.left = (left_right >> 10) & 0x3ff;
                q_data_dst->rect.top = (top_bottom >> 10) & 0x3ff;
                q_data_dst->rect.width = width - q_data_dst->rect.left -
                                         (left_right & 0x3ff);
                q_data_dst->rect.height = height - q_data_dst->rect.top -
                                          (top_bottom & 0x3ff);
        }

        ret = coda_alloc_framebuffers(ctx, q_data_dst, src_fourcc);
        if (ret < 0) {
                v4l2_err(&dev->v4l2_dev, "failed to allocate framebuffers\n");
                return ret;
        }

        /* Tell the decoder how many frame buffers we allocated. */
        coda_write(dev, ctx->num_internal_frames, CODA_CMD_SET_FRAME_BUF_NUM);
        coda_write(dev, width, CODA_CMD_SET_FRAME_BUF_STRIDE);

        if (dev->devtype->product != CODA_DX6) {
                /* Set secondary AXI IRAM */
                coda_setup_iram(ctx);

                coda_write(dev, ctx->iram_info.buf_bit_use,
                                CODA7_CMD_SET_FRAME_AXI_BIT_ADDR);
                coda_write(dev, ctx->iram_info.buf_ip_ac_dc_use,
                                CODA7_CMD_SET_FRAME_AXI_IPACDC_ADDR);
                coda_write(dev, ctx->iram_info.buf_dbk_y_use,
                                CODA7_CMD_SET_FRAME_AXI_DBKY_ADDR);
                coda_write(dev, ctx->iram_info.buf_dbk_c_use,
                                CODA7_CMD_SET_FRAME_AXI_DBKC_ADDR);
                coda_write(dev, ctx->iram_info.buf_ovl_use,
                                CODA7_CMD_SET_FRAME_AXI_OVL_ADDR);
                if (dev->devtype->product == CODA_960) {
                        coda_write(dev, ctx->iram_info.buf_btp_use,
                                        CODA9_CMD_SET_FRAME_AXI_BTP_ADDR);

                        coda_write(dev, -1, CODA9_CMD_SET_FRAME_DELAY);
                        coda9_set_frame_cache(ctx, dst_fourcc);
                }
        }

        if (src_fourcc == V4L2_PIX_FMT_H264) {
                coda_write(dev, ctx->slicebuf.paddr,
                                CODA_CMD_SET_FRAME_SLICE_BB_START);
                coda_write(dev, ctx->slicebuf.size / 1024,
                                CODA_CMD_SET_FRAME_SLICE_BB_SIZE);
        }

        if (dev->devtype->product == CODA_7541) {
                int max_mb_x = 1920 / 16;
                int max_mb_y = 1088 / 16;
                int max_mb_num = max_mb_x * max_mb_y;

                coda_write(dev, max_mb_num << 16 | max_mb_x << 8 | max_mb_y,
                                CODA7_CMD_SET_FRAME_MAX_DEC_SIZE);
        } else if (dev->devtype->product == CODA_960) {
                int max_mb_x = 1920 / 16;
                int max_mb_y = 1088 / 16;
                int max_mb_num = max_mb_x * max_mb_y;

                coda_write(dev, max_mb_num << 16 | max_mb_x << 8 | max_mb_y,
                                CODA9_CMD_SET_FRAME_MAX_DEC_SIZE);
        }

        if (coda_command_sync(ctx, CODA_COMMAND_SET_FRAME_BUF)) {
                v4l2_err(&ctx->dev->v4l2_dev,
                         "CODA_COMMAND_SET_FRAME_BUF timeout\n");
                return -ETIMEDOUT;
        }

        return 0;
}

static int coda_start_decoding(struct coda_ctx *ctx)
{
        struct coda_dev *dev = ctx->dev;
        int ret;

        mutex_lock(&dev->coda_mutex);
        ret = __coda_start_decoding(ctx);
        mutex_unlock(&dev->coda_mutex);

        return ret;
}

static int coda_prepare_decode(struct coda_ctx *ctx)
{
        struct vb2_v4l2_buffer *dst_buf;
        struct coda_dev *dev = ctx->dev;
        struct coda_q_data *q_data_dst;
        struct coda_buffer_meta *meta;
        unsigned long flags;
        u32 rot_mode = 0;
        u32 reg_addr, reg_stride;

        dst_buf = v4l2_m2m_next_dst_buf(ctx->fh.m2m_ctx);
        q_data_dst = get_q_data(ctx, V4L2_BUF_TYPE_VIDEO_CAPTURE);

        /* Try to copy source buffer contents into the bitstream ringbuffer */
        mutex_lock(&ctx->bitstream_mutex);
        coda_fill_bitstream(ctx, true);
        mutex_unlock(&ctx->bitstream_mutex);

        if (coda_get_bitstream_payload(ctx) < 512 &&
            (!(ctx->bit_stream_param & CODA_BIT_STREAM_END_FLAG))) {
                v4l2_dbg(1, coda_debug, &dev->v4l2_dev,
                         "bitstream payload: %d, skipping\n",
                         coda_get_bitstream_payload(ctx));
                v4l2_m2m_job_finish(ctx->dev->m2m_dev, ctx->fh.m2m_ctx);
                return -EAGAIN;
        }

        /* Run coda_start_decoding (again) if not yet initialized */
        if (!ctx->initialized) {
                int ret = __coda_start_decoding(ctx);

                if (ret < 0) {
                        v4l2_err(&dev->v4l2_dev, "failed to start decoding\n");
                        v4l2_m2m_job_finish(ctx->dev->m2m_dev, ctx->fh.m2m_ctx);
                        return -EAGAIN;
                } else {
                        ctx->initialized = 1;
                }
        }

        if (dev->devtype->product == CODA_960)
                coda_set_gdi_regs(ctx);

        if (ctx->use_vdoa &&
            ctx->display_idx >= 0 &&
            ctx->display_idx < ctx->num_internal_frames) {
                vdoa_device_run(ctx->vdoa,
                                vb2_dma_contig_plane_dma_addr(&dst_buf->vb2_buf, 0),
                                ctx->internal_frames[ctx->display_idx].paddr);
        } else {
                if (dev->devtype->product == CODA_960) {
                        /*
                         * The CODA960 seems to have an internal list of
                         * buffers with 64 entries that includes the
                         * registered frame buffers as well as the rotator
                         * buffer output.
                         *
                         * ROT_INDEX needs to be < 0x40, but >
                         * ctx->num_internal_frames.
                         */
                        coda_write(dev,
                                   CODA_MAX_FRAMEBUFFERS + dst_buf->vb2_buf.index,
                                   CODA9_CMD_DEC_PIC_ROT_INDEX);

                        reg_addr = CODA9_CMD_DEC_PIC_ROT_ADDR_Y;
                        reg_stride = CODA9_CMD_DEC_PIC_ROT_STRIDE;
                } else {
                        reg_addr = CODA_CMD_DEC_PIC_ROT_ADDR_Y;
                        reg_stride = CODA_CMD_DEC_PIC_ROT_STRIDE;
                }
                coda_write_base(ctx, q_data_dst, dst_buf, reg_addr);
                coda_write(dev, q_data_dst->bytesperline, reg_stride);

                rot_mode = CODA_ROT_MIR_ENABLE | ctx->params.rot_mode;
        }

        coda_write(dev, rot_mode, CODA_CMD_DEC_PIC_ROT_MODE);

        switch (dev->devtype->product) {
        case CODA_DX6:
                /* TBD */
        case CODA_7541:
                coda_write(dev, CODA_PRE_SCAN_EN, CODA_CMD_DEC_PIC_OPTION);
                break;
        case CODA_960:
                /* 'hardcode to use interrupt disable mode'? */
                coda_write(dev, (1 << 10), CODA_CMD_DEC_PIC_OPTION);
                break;
        }

        coda_write(dev, 0, CODA_CMD_DEC_PIC_SKIP_NUM);

        coda_write(dev, 0, CODA_CMD_DEC_PIC_BB_START);
        coda_write(dev, 0, CODA_CMD_DEC_PIC_START_BYTE);

        if (dev->devtype->product != CODA_DX6)
                coda_write(dev, ctx->iram_info.axi_sram_use,
                                CODA7_REG_BIT_AXI_SRAM_USE);

        spin_lock_irqsave(&ctx->buffer_meta_lock, flags);
        meta = list_first_entry_or_null(&ctx->buffer_meta_list,
                                        struct coda_buffer_meta, list);

        if (meta && ctx->codec->src_fourcc == V4L2_PIX_FMT_JPEG) {

                /* If this is the last buffer in the bitstream, add padding */
                if (meta->end == (ctx->bitstream_fifo.kfifo.in &
                                  ctx->bitstream_fifo.kfifo.mask)) {
                        static unsigned char buf[512];
                        unsigned int pad;

                        /* Pad to multiple of 256 and then add 256 more */
                        pad = ((0 - meta->end) & 0xff) + 256;

                        memset(buf, 0xff, sizeof(buf));

                        kfifo_in(&ctx->bitstream_fifo, buf, pad);
                }
        }
        spin_unlock_irqrestore(&ctx->buffer_meta_lock, flags);

        coda_kfifo_sync_to_device_full(ctx);

        /* Clear decode success flag */
        coda_write(dev, 0, CODA_RET_DEC_PIC_SUCCESS);

        trace_coda_dec_pic_run(ctx, meta);

        coda_command_async(ctx, CODA_COMMAND_PIC_RUN);

        return 0;
}

static void coda_finish_decode(struct coda_ctx *ctx)
{
        struct coda_dev *dev = ctx->dev;
        struct coda_q_data *q_data_src;
        struct coda_q_data *q_data_dst;
        struct vb2_v4l2_buffer *dst_buf;
        struct coda_buffer_meta *meta;
        unsigned long payload;
        unsigned long flags;
        int width, height;
        int decoded_idx;
        int display_idx;
        u32 src_fourcc;
        int success;
        u32 err_mb;
        int err_vdoa = 0;
        u32 val;

        /* Update kfifo out pointer from coda bitstream read pointer */
        coda_kfifo_sync_from_device(ctx);

        /*
         * in stream-end mode, the read pointer can overshoot the write pointer
         * by up to 512 bytes
         */
        if (ctx->bit_stream_param & CODA_BIT_STREAM_END_FLAG) {
                if (coda_get_bitstream_payload(ctx) >= ctx->bitstream.size - 512)
                        kfifo_init(&ctx->bitstream_fifo,
                                ctx->bitstream.vaddr, ctx->bitstream.size);
        }

        q_data_src = get_q_data(ctx, V4L2_BUF_TYPE_VIDEO_OUTPUT);
        src_fourcc = q_data_src->fourcc;

        val = coda_read(dev, CODA_RET_DEC_PIC_SUCCESS);
        if (val != 1)
                pr_err("DEC_PIC_SUCCESS = %d\n", val);

        success = val & 0x1;
        if (!success)
                v4l2_err(&dev->v4l2_dev, "decode failed\n");

        if (src_fourcc == V4L2_PIX_FMT_H264) {
                if (val & (1 << 3))
                        v4l2_err(&dev->v4l2_dev,
                                 "insufficient PS buffer space (%d bytes)\n",
                                 ctx->psbuf.size);
                if (val & (1 << 2))
                        v4l2_err(&dev->v4l2_dev,
                                 "insufficient slice buffer space (%d bytes)\n",
                                 ctx->slicebuf.size);
        }

        val = coda_read(dev, CODA_RET_DEC_PIC_SIZE);
        width = (val >> 16) & 0xffff;
        height = val & 0xffff;

        q_data_dst = get_q_data(ctx, V4L2_BUF_TYPE_VIDEO_CAPTURE);

        /* frame crop information */
        if (src_fourcc == V4L2_PIX_FMT_H264) {
                u32 left_right;
                u32 top_bottom;

                left_right = coda_read(dev, CODA_RET_DEC_PIC_CROP_LEFT_RIGHT);
                top_bottom = coda_read(dev, CODA_RET_DEC_PIC_CROP_TOP_BOTTOM);

                if (left_right == 0xffffffff && top_bottom == 0xffffffff) {
                        /* Keep current crop information */
                } else {
                        struct v4l2_rect *rect = &q_data_dst->rect;

                        rect->left = left_right >> 16 & 0xffff;
                        rect->top = top_bottom >> 16 & 0xffff;
                        rect->width = width - rect->left -
                                      (left_right & 0xffff);
                        rect->height = height - rect->top -
                                       (top_bottom & 0xffff);
                }
        } else {
                /* no cropping */
        }

        err_mb = coda_read(dev, CODA_RET_DEC_PIC_ERR_MB);
        if (err_mb > 0)
                v4l2_err(&dev->v4l2_dev,
                         "errors in %d macroblocks\n", err_mb);

        if (dev->devtype->product == CODA_7541) {
                val = coda_read(dev, CODA_RET_DEC_PIC_OPTION);
                if (val == 0) {
                        /* not enough bitstream data */
                        v4l2_dbg(1, coda_debug, &dev->v4l2_dev,
                                 "prescan failed: %d\n", val);
                        ctx->hold = true;
                        return;
                }
        }

        /* Wait until the VDOA finished writing the previous display frame */
        if (ctx->use_vdoa &&
            ctx->display_idx >= 0 &&
            ctx->display_idx < ctx->num_internal_frames) {
                err_vdoa = vdoa_wait_for_completion(ctx->vdoa);
        }

        ctx->frm_dis_flg = coda_read(dev,
                                     CODA_REG_BIT_FRM_DIS_FLG(ctx->reg_idx));

        /* The previous display frame was copied out and can be overwritten */
        if (ctx->display_idx >= 0 &&
            ctx->display_idx < ctx->num_internal_frames) {
                ctx->frm_dis_flg &= ~(1 << ctx->display_idx);
                coda_write(dev, ctx->frm_dis_flg,
                                CODA_REG_BIT_FRM_DIS_FLG(ctx->reg_idx));
        }

        /*
         * The index of the last decoded frame, not necessarily in
         * display order, and the index of the next display frame.
         * The latter could have been decoded in a previous run.
         */
        decoded_idx = coda_read(dev, CODA_RET_DEC_PIC_CUR_IDX);
        display_idx = coda_read(dev, CODA_RET_DEC_PIC_FRAME_IDX);

        if (decoded_idx == -1) {
                /* no frame was decoded, but we might have a display frame */
                if (display_idx >= 0 && display_idx < ctx->num_internal_frames)
                        ctx->sequence_offset++;
                else if (ctx->display_idx < 0)
                        ctx->hold = true;
        } else if (decoded_idx == -2) {
                /* no frame was decoded, we still return remaining buffers */

        } else if (decoded_idx < 0 || decoded_idx >= ctx->num_internal_frames) {
                v4l2_err(&dev->v4l2_dev,
                         "decoded frame index out of range: %d\n", decoded_idx);
        } else {
                val = coda_read(dev, CODA_RET_DEC_PIC_FRAME_NUM) - 1;
                val -= ctx->sequence_offset;
                spin_lock_irqsave(&ctx->buffer_meta_lock, flags);
                if (!list_empty(&ctx->buffer_meta_list)) {
                        meta = list_first_entry(&ctx->buffer_meta_list,
                                              struct coda_buffer_meta, list);
                        list_del(&meta->list);
                        ctx->num_metas--;
                        spin_unlock_irqrestore(&ctx->buffer_meta_lock, flags);
                        /*
                         * Clamp counters to 16 bits for comparison, as the HW
                         * counter rolls over at this point for h.264. This
                         * may be different for other formats, but using 16 bits
                         * should be enough to detect most errors and saves us
                         * from doing different things based on the format.
                         */
                        if ((val & 0xffff) != (meta->sequence & 0xffff)) {
                                v4l2_err(&dev->v4l2_dev,
                                         "sequence number mismatch (%d(%d) != %d)\n",
                                         val, ctx->sequence_offset,
                                         meta->sequence);
                        }
                        ctx->frame_metas[decoded_idx] = *meta;
                        kfree(meta);
                } else {
                        spin_unlock_irqrestore(&ctx->buffer_meta_lock, flags);
                        v4l2_err(&dev->v4l2_dev, "empty timestamp list!\n");
                        memset(&ctx->frame_metas[decoded_idx], 0,
                               sizeof(struct coda_buffer_meta));
                        ctx->frame_metas[decoded_idx].sequence = val;
                        ctx->sequence_offset++;
                }

                trace_coda_dec_pic_done(ctx, &ctx->frame_metas[decoded_idx]);

                val = coda_read(dev, CODA_RET_DEC_PIC_TYPE) & 0x7;
                if (val == 0)
                        ctx->frame_types[decoded_idx] = V4L2_BUF_FLAG_KEYFRAME;
                else if (val == 1)
                        ctx->frame_types[decoded_idx] = V4L2_BUF_FLAG_PFRAME;
                else
                        ctx->frame_types[decoded_idx] = V4L2_BUF_FLAG_BFRAME;

                ctx->frame_errors[decoded_idx] = err_mb;
        }

        if (display_idx == -1) {
                /*
                 * no more frames to be decoded, but there could still
                 * be rotator output to dequeue
                 */
                ctx->hold = true;
        } else if (display_idx == -3) {
                /* possibly prescan failure */
        } else if (display_idx < 0 || display_idx >= ctx->num_internal_frames) {
                v4l2_err(&dev->v4l2_dev,
                         "presentation frame index out of range: %d\n",
                         display_idx);
        }

        /* If a frame was copied out, return it */
        if (ctx->display_idx >= 0 &&
            ctx->display_idx < ctx->num_internal_frames) {
                dst_buf = v4l2_m2m_dst_buf_remove(ctx->fh.m2m_ctx);
                dst_buf->sequence = ctx->osequence++;

                dst_buf->flags &= ~(V4L2_BUF_FLAG_KEYFRAME |
                                             V4L2_BUF_FLAG_PFRAME |
                                             V4L2_BUF_FLAG_BFRAME);
                dst_buf->flags |= ctx->frame_types[ctx->display_idx];
                meta = &ctx->frame_metas[ctx->display_idx];
                dst_buf->timecode = meta->timecode;
                dst_buf->vb2_buf.timestamp = meta->timestamp;

                trace_coda_dec_rot_done(ctx, dst_buf, meta);

                switch (q_data_dst->fourcc) {
                case V4L2_PIX_FMT_YUYV:
                        payload = width * height * 2;
                        break;
                case V4L2_PIX_FMT_YUV420:
                case V4L2_PIX_FMT_YVU420:
                case V4L2_PIX_FMT_NV12:
                default:
                        payload = width * height * 3 / 2;
                        break;
                case V4L2_PIX_FMT_YUV422P:
                        payload = width * height * 2;
                        break;
                }
                vb2_set_plane_payload(&dst_buf->vb2_buf, 0, payload);

                if (ctx->frame_errors[ctx->display_idx] || err_vdoa)
                        coda_m2m_buf_done(ctx, dst_buf, VB2_BUF_STATE_ERROR);
                else
                        coda_m2m_buf_done(ctx, dst_buf, VB2_BUF_STATE_DONE);

                v4l2_dbg(1, coda_debug, &dev->v4l2_dev,
                        "job finished: decoding frame (%d) (%s)\n",
                        dst_buf->sequence,
                        (dst_buf->flags & V4L2_BUF_FLAG_KEYFRAME) ?
                        "KEYFRAME" : "PFRAME");
        } else {
                v4l2_dbg(1, coda_debug, &dev->v4l2_dev,
                        "job finished: no frame decoded\n");
        }

        /* The rotator will copy the current display frame next time */
        ctx->display_idx = display_idx;
}

const struct coda_context_ops coda_bit_decode_ops = {
        .queue_init = coda_decoder_queue_init,
        .reqbufs = coda_decoder_reqbufs,
        .start_streaming = coda_start_decoding,
        .prepare_run = coda_prepare_decode,
        .finish_run = coda_finish_decode,
        .seq_end_work = coda_seq_end_work,
        .release = coda_bit_release,
};

irqreturn_t coda_irq_handler(int irq, void *data)
{
        struct coda_dev *dev = data;
        struct coda_ctx *ctx;

        /* read status register to attend the IRQ */
        coda_read(dev, CODA_REG_BIT_INT_STATUS);
        coda_write(dev, CODA_REG_BIT_INT_CLEAR_SET,
                      CODA_REG_BIT_INT_CLEAR);

        ctx = v4l2_m2m_get_curr_priv(dev->m2m_dev);
        if (ctx == NULL) {
                v4l2_err(&dev->v4l2_dev,
                         "Instance released before the end of transaction\n");
                mutex_unlock(&dev->coda_mutex);
                return IRQ_HANDLED;
        }

        trace_coda_bit_done(ctx);

        if (ctx->aborting) {
                v4l2_dbg(1, coda_debug, &ctx->dev->v4l2_dev,
                         "task has been aborted\n");
        }

        if (coda_isbusy(ctx->dev)) {
                v4l2_dbg(1, coda_debug, &ctx->dev->v4l2_dev,
                         "coda is still busy!!!!\n");
                return IRQ_NONE;
        }

        complete(&ctx->completion);

        return IRQ_HANDLED;
}