drivers/media/platform/coda/coda-bit.c

/*
 * 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-core.h>
#include <media/videobuf2-dma-contig.h>
#include <media/videobuf2-vmalloc.h>

#include "coda.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);

	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;

	coda_command_async(ctx, cmd);
	return coda_wait_timeout(dev);
}

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_buffer *src_buf)
{
	u32 src_size = vb2_get_plane_payload(src_buf, 0);
	u32 n;

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

	dma_sync_single_for_device(&ctx->dev->plat_dev->dev,
				   ctx->bitstream.paddr, ctx->bitstream.size,
				   DMA_TO_DEVICE);

	src_buf->v4l2_buf.sequence = ctx->qsequence++;

	return 0;
}

static bool coda_bitstream_try_queue(struct coda_ctx *ctx,
				     struct vb2_buffer *src_buf)
{
	int ret;

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

	if (vb2_plane_vaddr(src_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)
{
	struct vb2_buffer *src_buf;
	struct coda_buffer_meta *meta;
	u32 start;

	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)) {
			v4l2_err(&ctx->dev->v4l2_dev,
				 "dropping invalid JPEG frame\n");
			src_buf = v4l2_m2m_src_buf_remove(ctx->fh.m2m_ctx);
			v4l2_m2m_buf_done(src_buf, VB2_BUF_STATE_ERROR);
			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->v4l2_buf.sequence;
				meta->timecode = src_buf->v4l2_buf.timecode;
				meta->timestamp = src_buf->v4l2_buf.timestamp;
				meta->start = start;
				meta->end = ctx->bitstream_fifo.kfifo.in &
					    ctx->bitstream_fifo.kfifo.mask;
				list_add_tail(&meta->list,
					      &ctx->buffer_meta_list);
			}

			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;
	dma_addr_t paddr;
	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;

		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++) {
		paddr = ctx->internal_frames[i].paddr;
		/* Start addresses of Y, Cb, Cr planes */
		coda_parabuf_write(ctx, i * 3 + 0, paddr);
		coda_parabuf_write(ctx, i * 3 + 1, paddr + ysize);
		coda_parabuf_write(ctx, i * 3 + 2, paddr + ysize + ysize / 4);

		/* 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[i].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) {
			v4l2_err(&dev->v4l2_dev, "failed to allocate parabuf");
			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) {
			v4l2_err(&dev->v4l2_dev,
				 "failed to allocate %d byte slice buffer",
				 ctx->slicebuf.size);
			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) {
			v4l2_err(&dev->v4l2_dev,
				 "failed to allocate psmem buffer");
			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) {
			v4l2_err(&dev->v4l2_dev,
				 "failed to allocate %d byte context buffer",
				 ctx->workbuf.size);
			goto err;
		}
	}

	return 0;

err:
	coda_free_context_buffers(ctx);
	return ret;
}

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

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

	coda_write(dev, vb2_dma_contig_plane_dma_addr(buf, 0),
		   CODA_CMD_ENC_HEADER_BB_START);
	bufsize = vb2_plane_size(buf, 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(buf, 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(buf, 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;
}

/*
 * 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_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, 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;
	if (q_data_src->fourcc == V4L2_PIX_FMT_NV12)
		ctx->frame_mem_ctrl |= CODA_FRAME_CHROMA_INTERLEAVE;
	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;
		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, 0, 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;
	}

	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);

			/* 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_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->v4l2_buf.sequence = ctx->osequence;
	dst_buf->v4l2_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->v4l2_buf.sequence % ctx->params.gop_size) {
		src_buf->v4l2_buf.flags |= V4L2_BUF_FLAG_PFRAME;
		src_buf->v4l2_buf.flags &= ~V4L2_BUF_FLAG_KEYFRAME;
	} else {
		src_buf->v4l2_buf.flags |= V4L2_BUF_FLAG_KEYFRAME;
		src_buf->v4l2_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->v4l2_buf.sequence == 0) {
		pic_stream_buffer_addr =
			vb2_dma_contig_plane_dma_addr(dst_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, 0),
		       &ctx->vpu_header[0][0], ctx->vpu_header_size[0]);
		memcpy(vb2_plane_vaddr(dst_buf, 0) + ctx->vpu_header_size[0],
		       &ctx->vpu_header[1][0], ctx->vpu_header_size[1]);
		memcpy(vb2_plane_vaddr(dst_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, 0);
		pic_stream_buffer_size = q_data_dst->sizeimage;
	}

	if (src_buf->v4l2_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);

	coda_command_async(ctx, CODA_COMMAND_PIC_RUN);

	return 0;
}

static void coda_finish_encode(struct coda_ctx *ctx)
{
	struct vb2_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);

	/* 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->v4l2_buf.sequence == 0) {
		vb2_set_plane_payload(dst_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, 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->v4l2_buf.flags |= V4L2_BUF_FLAG_KEYFRAME;
		dst_buf->v4l2_buf.flags &= ~V4L2_BUF_FLAG_PFRAME;
	} else {
		dst_buf->v4l2_buf.flags |= V4L2_BUF_FLAG_PFRAME;
		dst_buf->v4l2_buf.flags &= ~V4L2_BUF_FLAG_KEYFRAME;
	}

	dst_buf->v4l2_buf.timestamp = src_buf->v4l2_buf.timestamp;
	dst_buf->v4l2_buf.flags &= ~V4L2_BUF_FLAG_TSTAMP_SRC_MASK;
	dst_buf->v4l2_buf.flags |=
		src_buf->v4l2_buf.flags & V4L2_BUF_FLAG_TSTAMP_SRC_MASK;
	dst_buf->v4l2_buf.timecode = src_buf->v4l2_buf.timecode;

	v4l2_m2m_buf_done(src_buf, VB2_BUF_STATE_DONE);

	dst_buf = v4l2_m2m_dst_buf_remove(ctx->fh.m2m_ctx);
	v4l2_m2m_buf_done(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->v4l2_buf.sequence,
		(dst_buf->v4l2_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);

	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");
	}

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

	coda_free_framebuffers(ctx);

	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_writecombine(
			&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_writecombine(&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;

	/* 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;
	if (dst_fourcc == V4L2_PIX_FMT_NV12)
		ctx->frame_mem_ctrl |= CODA_FRAME_CHROMA_INTERLEAVE;
	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;
	}

	/* 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 (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);
	}

	if (dev->devtype->product == CODA_960) {
		int cbb_size, crb_size;

		coda_write(dev, -1, CODA9_CMD_SET_FRAME_DELAY);
		/* Luma 2x0 page, 2x6 cache, chroma 2x0 page, 2x4 cache size */
		coda_write(dev, 0x20262024, CODA9_CMD_SET_FRAME_CACHE_SIZE);

		if (dst_fourcc == V4L2_PIX_FMT_NV12) {
			cbb_size = 0;
			crb_size = 16;
		} else {
			cbb_size = 8;
			crb_size = 8;
		}
		coda_write(dev, 2 << CODA9_CACHE_PAGEMERGE_OFFSET |
				32 << CODA9_CACHE_LUMA_BUFFER_SIZE_OFFSET |
				cbb_size << CODA9_CACHE_CB_BUFFER_SIZE_OFFSET |
				crb_size << CODA9_CACHE_CR_BUFFER_SIZE_OFFSET,
				CODA9_CMD_SET_FRAME_CACHE_CONFIG);
	}

	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_buffer *dst_buf;
	struct coda_dev *dev = ctx->dev;
	struct coda_q_data *q_data_dst;
	struct coda_buffer_meta *meta;
	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);
	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 (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->v4l2_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);

	coda_write(dev, CODA_ROT_MIR_ENABLE | ctx->params.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);

	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);
		}
	}

	coda_kfifo_sync_to_device_full(ctx);

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

	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_buffer *dst_buf;
	struct coda_buffer_meta *meta;
	unsigned long payload;
	int width, height;
	int decoded_idx;
	int display_idx;
	u32 src_fourcc;
	int success;
	u32 err_mb;
	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;
		}
	}

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

	/*
	 * The previous display frame was copied out by the rotator,
	 * now it can be overwritten again
	 */
	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;
		mutex_lock(&ctx->bitstream_mutex);
		if (!list_empty(&ctx->buffer_meta_list)) {
			meta = list_first_entry(&ctx->buffer_meta_list,
					      struct coda_buffer_meta, list);
			list_del(&meta->list);
			if (val != (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 {
			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++;
		}
		mutex_unlock(&ctx->bitstream_mutex);

		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->v4l2_buf.sequence = ctx->osequence++;

		dst_buf->v4l2_buf.flags &= ~(V4L2_BUF_FLAG_KEYFRAME |
					     V4L2_BUF_FLAG_PFRAME |
					     V4L2_BUF_FLAG_BFRAME);
		dst_buf->v4l2_buf.flags |= ctx->frame_types[ctx->display_idx];
		meta = &ctx->frame_metas[ctx->display_idx];
		dst_buf->v4l2_buf.timecode = meta->timecode;
		dst_buf->v4l2_buf.timestamp = meta->timestamp;

		switch (q_data_dst->fourcc) {
		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, 0, payload);

		v4l2_m2m_buf_done(dst_buf, ctx->frame_errors[display_idx] ?
				  VB2_BUF_STATE_ERROR : VB2_BUF_STATE_DONE);

		v4l2_dbg(1, coda_debug, &dev->v4l2_dev,
			"job finished: decoding frame (%d) (%s)\n",
			dst_buf->v4l2_buf.sequence,
			(dst_buf->v4l2_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;
	}

	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;
}