drivers/media/platform/sti/delta/delta-mjpeg-dec.c - arm/linux - Git at Google

 /*
  * Copyright (C) STMicroelectronics SA 2013
  * Author: Hugues Fruchet <hugues.fruchet@st.com> for STMicroelectronics.
  * License terms:  GNU General Public License (GPL), version 2
  */

 #include <linux/slab.h>

 #include "delta.h"
 #include "delta-ipc.h"
 #include "delta-mjpeg.h"
 #include "delta-mjpeg-fw.h"

 #define DELTA_MJPEG_MAX_RESO DELTA_MAX_RESO

 struct delta_mjpeg_ctx {
 	/* jpeg header */
 	struct mjpeg_header header_struct;
 	struct mjpeg_header *header;

 	/* ipc */
 	void *ipc_hdl;
 	struct delta_buf *ipc_buf;

 	/* decoded output frame */
 	struct delta_frame *out_frame;

 	unsigned char str[3000];
 };

 #define to_ctx(ctx) ((struct delta_mjpeg_ctx *)(ctx)->priv)

 static char *ipc_open_param_str(struct jpeg_video_decode_init_params_t *p,
 				char *str, unsigned int len)
 {
 	char *b = str;

 	if (!p)
 		return "";

 	b += snprintf(b, len,
 		      "jpeg_video_decode_init_params_t\n"
 		      "circular_buffer_begin_addr_p 0x%x\n"
 		      "circular_buffer_end_addr_p   0x%x\n",
 		      p->circular_buffer_begin_addr_p,
 		      p->circular_buffer_end_addr_p);

 	return str;
 }

 static char *ipc_decode_param_str(struct jpeg_decode_params_t *p,
 				  char *str, unsigned int len)
 {
 	char *b = str;

 	if (!p)
 		return "";

 	b += snprintf(b, len,
 		      "jpeg_decode_params_t\n"
 		      "picture_start_addr_p                  0x%x\n"
 		      "picture_end_addr_p                    0x%x\n"
 		      "decoding_mode                        %d\n"
 		      "display_buffer_addr.display_decimated_luma_p   0x%x\n"
 		      "display_buffer_addr.display_decimated_chroma_p 0x%x\n"
 		      "main_aux_enable                       %d\n"
 		      "additional_flags                     0x%x\n"
 		      "field_flag                           %x\n"
 		      "is_jpeg_image                        %x\n",
 		      p->picture_start_addr_p,
 		      p->picture_end_addr_p,
 		      p->decoding_mode,
 		      p->display_buffer_addr.display_decimated_luma_p,
 		      p->display_buffer_addr.display_decimated_chroma_p,
 		      p->main_aux_enable, p->additional_flags,
 		      p->field_flag,
 		      p->is_jpeg_image);

 	return str;
 }

 static inline bool is_stream_error(enum jpeg_decoding_error_t err)
 {
 	switch (err) {
 	case JPEG_DECODER_UNDEFINED_HUFF_TABLE:
 	case JPEG_DECODER_BAD_RESTART_MARKER:
 	case JPEG_DECODER_BAD_SOS_SPECTRAL:
 	case JPEG_DECODER_BAD_SOS_SUCCESSIVE:
 	case JPEG_DECODER_BAD_HEADER_LENGTH:
 	case JPEG_DECODER_BAD_COUNT_VALUE:
 	case JPEG_DECODER_BAD_DHT_MARKER:
 	case JPEG_DECODER_BAD_INDEX_VALUE:
 	case JPEG_DECODER_BAD_NUMBER_HUFFMAN_TABLES:
 	case JPEG_DECODER_BAD_QUANT_TABLE_LENGTH:
 	case JPEG_DECODER_BAD_NUMBER_QUANT_TABLES:
 	case JPEG_DECODER_BAD_COMPONENT_COUNT:
 		return true;
 	default:
 		return false;
 	}
 }

 static inline const char *err_str(enum jpeg_decoding_error_t err)
 {
 	switch (err) {
 	case JPEG_DECODER_NO_ERROR:
 		return "JPEG_DECODER_NO_ERROR";
 	case JPEG_DECODER_UNDEFINED_HUFF_TABLE:
 		return "JPEG_DECODER_UNDEFINED_HUFF_TABLE";
 	case JPEG_DECODER_UNSUPPORTED_MARKER:
 		return "JPEG_DECODER_UNSUPPORTED_MARKER";
 	case JPEG_DECODER_UNABLE_ALLOCATE_MEMORY:
 		return "JPEG_DECODER_UNABLE_ALLOCATE_MEMORY";
 	case JPEG_DECODER_NON_SUPPORTED_SAMP_FACTORS:
 		return "JPEG_DECODER_NON_SUPPORTED_SAMP_FACTORS";
 	case JPEG_DECODER_BAD_PARAMETER:
 		return "JPEG_DECODER_BAD_PARAMETER";
 	case JPEG_DECODER_DECODE_ERROR:
 		return "JPEG_DECODER_DECODE_ERROR";
 	case JPEG_DECODER_BAD_RESTART_MARKER:
 		return "JPEG_DECODER_BAD_RESTART_MARKER";
 	case JPEG_DECODER_UNSUPPORTED_COLORSPACE:
 		return "JPEG_DECODER_UNSUPPORTED_COLORSPACE";
 	case JPEG_DECODER_BAD_SOS_SPECTRAL:
 		return "JPEG_DECODER_BAD_SOS_SPECTRAL";
 	case JPEG_DECODER_BAD_SOS_SUCCESSIVE:
 		return "JPEG_DECODER_BAD_SOS_SUCCESSIVE";
 	case JPEG_DECODER_BAD_HEADER_LENGTH:
 		return "JPEG_DECODER_BAD_HEADER_LENGTH";
 	case JPEG_DECODER_BAD_COUNT_VALUE:
 		return "JPEG_DECODER_BAD_COUNT_VALUE";
 	case JPEG_DECODER_BAD_DHT_MARKER:
 		return "JPEG_DECODER_BAD_DHT_MARKER";
 	case JPEG_DECODER_BAD_INDEX_VALUE:
 		return "JPEG_DECODER_BAD_INDEX_VALUE";
 	case JPEG_DECODER_BAD_NUMBER_HUFFMAN_TABLES:
 		return "JPEG_DECODER_BAD_NUMBER_HUFFMAN_TABLES";
 	case JPEG_DECODER_BAD_QUANT_TABLE_LENGTH:
 		return "JPEG_DECODER_BAD_QUANT_TABLE_LENGTH";
 	case JPEG_DECODER_BAD_NUMBER_QUANT_TABLES:
 		return "JPEG_DECODER_BAD_NUMBER_QUANT_TABLES";
 	case JPEG_DECODER_BAD_COMPONENT_COUNT:
 		return "JPEG_DECODER_BAD_COMPONENT_COUNT";
 	case JPEG_DECODER_DIVIDE_BY_ZERO_ERROR:
 		return "JPEG_DECODER_DIVIDE_BY_ZERO_ERROR";
 	case JPEG_DECODER_NOT_JPG_IMAGE:
 		return "JPEG_DECODER_NOT_JPG_IMAGE";
 	case JPEG_DECODER_UNSUPPORTED_ROTATION_ANGLE:
 		return "JPEG_DECODER_UNSUPPORTED_ROTATION_ANGLE";
 	case JPEG_DECODER_UNSUPPORTED_SCALING:
 		return "JPEG_DECODER_UNSUPPORTED_SCALING";
 	case JPEG_DECODER_INSUFFICIENT_OUTPUTBUFFER_SIZE:
 		return "JPEG_DECODER_INSUFFICIENT_OUTPUTBUFFER_SIZE";
 	case JPEG_DECODER_BAD_HWCFG_GP_VERSION_VALUE:
 		return "JPEG_DECODER_BAD_HWCFG_GP_VERSION_VALUE";
 	case JPEG_DECODER_BAD_VALUE_FROM_RED:
 		return "JPEG_DECODER_BAD_VALUE_FROM_RED";
 	case JPEG_DECODER_BAD_SUBREGION_PARAMETERS:
 		return "JPEG_DECODER_BAD_SUBREGION_PARAMETERS";
 	case JPEG_DECODER_PROGRESSIVE_DECODE_NOT_SUPPORTED:
 		return "JPEG_DECODER_PROGRESSIVE_DECODE_NOT_SUPPORTED";
 	case JPEG_DECODER_ERROR_TASK_TIMEOUT:
 		return "JPEG_DECODER_ERROR_TASK_TIMEOUT";
 	case JPEG_DECODER_ERROR_FEATURE_NOT_SUPPORTED:
 		return "JPEG_DECODER_ERROR_FEATURE_NOT_SUPPORTED";
 	default:
 		return "!unknown MJPEG error!";
 	}
 }

 static bool delta_mjpeg_check_status(struct delta_ctx *pctx,
 				     struct jpeg_decode_return_params_t *status)
 {
 	struct delta_dev *delta = pctx->dev;
 	bool dump = false;

 	if (status->error_code == JPEG_DECODER_NO_ERROR)
 		goto out;

 	if (is_stream_error(status->error_code)) {
 		dev_warn_ratelimited(delta->dev,
 				     "%s  firmware: stream error @ frame %d (%s)\n",
 				     pctx->name, pctx->decoded_frames,
 				     err_str(status->error_code));
 		pctx->stream_errors++;
 	} else {
 		dev_warn_ratelimited(delta->dev,
 				     "%s  firmware: decode error @ frame %d (%s)\n",
 				     pctx->name, pctx->decoded_frames,
 				     err_str(status->error_code));
 		pctx->decode_errors++;
 		dump = true;
 	}

 out:
 	dev_dbg(delta->dev,
 		"%s  firmware: decoding time(us)=%d\n", pctx->name,
 		status->decode_time_in_us);

 	return dump;
 }

 static int delta_mjpeg_ipc_open(struct delta_ctx *pctx)
 {
 	struct delta_dev *delta = pctx->dev;
 	struct delta_mjpeg_ctx *ctx = to_ctx(pctx);
 	int ret = 0;
 	struct jpeg_video_decode_init_params_t params_struct;
 	struct jpeg_video_decode_init_params_t *params = &params_struct;
 	struct delta_buf *ipc_buf;
 	u32 ipc_buf_size;
 	struct delta_ipc_param ipc_param;
 	void *hdl;

 	memset(params, 0, sizeof(*params));
 	params->circular_buffer_begin_addr_p = 0x00000000;
 	params->circular_buffer_end_addr_p = 0xffffffff;

 	dev_vdbg(delta->dev,
 		 "%s  %s\n", pctx->name,
 		 ipc_open_param_str(params, ctx->str, sizeof(ctx->str)));

 	ipc_param.size = sizeof(*params);
 	ipc_param.data = params;
 	ipc_buf_size = sizeof(struct jpeg_decode_params_t) +
 	    sizeof(struct jpeg_decode_return_params_t);
 	ret = delta_ipc_open(pctx, "JPEG_DECODER_HW0", &ipc_param,
 			     ipc_buf_size, &ipc_buf, &hdl);
 	if (ret) {
 		dev_err(delta->dev,
 			"%s  dumping command %s\n", pctx->name,
 			ipc_open_param_str(params, ctx->str, sizeof(ctx->str)));
 		return ret;
 	}

 	ctx->ipc_buf = ipc_buf;
 	ctx->ipc_hdl = hdl;

 	return 0;
 }

 static int delta_mjpeg_ipc_decode(struct delta_ctx *pctx, struct delta_au *au)
 {
 	struct delta_dev *delta = pctx->dev;
 	struct delta_mjpeg_ctx *ctx = to_ctx(pctx);
 	int ret = 0;
 	struct jpeg_decode_params_t *params = ctx->ipc_buf->vaddr;
 	struct jpeg_decode_return_params_t *status =
 	    ctx->ipc_buf->vaddr + sizeof(*params);
 	struct delta_frame *frame;
 	struct delta_ipc_param ipc_param, ipc_status;

 	ret = delta_get_free_frame(pctx, &frame);
 	if (ret)
 		return ret;

 	memset(params, 0, sizeof(*params));

 	params->picture_start_addr_p = (u32)(au->paddr);
 	params->picture_end_addr_p = (u32)(au->paddr + au->size - 1);

 	/*
 	 * !WARNING!
 	 * the NV12 decoded frame is only available
 	 * on decimated output when enabling flag
 	 * "JPEG_ADDITIONAL_FLAG_420MB"...
 	 * the non decimated output gives YUV422SP
 	 */
 	params->main_aux_enable = JPEG_DISP_AUX_EN;
 	params->additional_flags = JPEG_ADDITIONAL_FLAG_420MB;
 	params->horizontal_decimation_factor = JPEG_HDEC_1;
 	params->vertical_decimation_factor = JPEG_VDEC_1;
 	params->decoding_mode = JPEG_NORMAL_DECODE;

 	params->display_buffer_addr.struct_size =
 	    sizeof(struct jpeg_display_buffer_address_t);
 	params->display_buffer_addr.display_decimated_luma_p =
 	    (u32)frame->paddr;
 	params->display_buffer_addr.display_decimated_chroma_p =
 	    (u32)(frame->paddr
 		  + frame->info.aligned_width * frame->info.aligned_height);

 	dev_vdbg(delta->dev,
 		 "%s  %s\n", pctx->name,
 		 ipc_decode_param_str(params, ctx->str, sizeof(ctx->str)));

 	/* status */
 	memset(status, 0, sizeof(*status));
 	status->error_code = JPEG_DECODER_NO_ERROR;

 	ipc_param.size = sizeof(*params);
 	ipc_param.data = params;
 	ipc_status.size = sizeof(*status);
 	ipc_status.data = status;
 	ret = delta_ipc_decode(ctx->ipc_hdl, &ipc_param, &ipc_status);
 	if (ret) {
 		dev_err(delta->dev,
 			"%s  dumping command %s\n", pctx->name,
 			ipc_decode_param_str(params, ctx->str,
 					     sizeof(ctx->str)));
 		return ret;
 	}

 	pctx->decoded_frames++;

 	/* check firmware decoding status */
 	if (delta_mjpeg_check_status(pctx, status)) {
 		dev_err(delta->dev,
 			"%s  dumping command %s\n", pctx->name,
 			ipc_decode_param_str(params, ctx->str,
 					     sizeof(ctx->str)));
 	}

 	frame->field = V4L2_FIELD_NONE;
 	frame->flags = V4L2_BUF_FLAG_KEYFRAME;
 	frame->state |= DELTA_FRAME_DEC;

 	ctx->out_frame = frame;

 	return 0;
 }

 static int delta_mjpeg_open(struct delta_ctx *pctx)
 {
 	struct delta_mjpeg_ctx *ctx;

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

 	return 0;
 }

 static int delta_mjpeg_close(struct delta_ctx *pctx)
 {
 	struct delta_mjpeg_ctx *ctx = to_ctx(pctx);

 	if (ctx->ipc_hdl) {
 		delta_ipc_close(ctx->ipc_hdl);
 		ctx->ipc_hdl = NULL;
 	}

 	kfree(ctx);

 	return 0;
 }

 static int delta_mjpeg_get_streaminfo(struct delta_ctx *pctx,
 				      struct delta_streaminfo *streaminfo)
 {
 	struct delta_mjpeg_ctx *ctx = to_ctx(pctx);

 	if (!ctx->header)
 		goto nodata;

 	streaminfo->streamformat = V4L2_PIX_FMT_MJPEG;
 	streaminfo->width = ctx->header->frame_width;
 	streaminfo->height = ctx->header->frame_height;

 	/* progressive stream */
 	streaminfo->field = V4L2_FIELD_NONE;

 	streaminfo->dpb = 1;

 	return 0;

 nodata:
 	return -ENODATA;
 }

 static int delta_mjpeg_decode(struct delta_ctx *pctx, struct delta_au *pau)
 {
 	struct delta_dev *delta = pctx->dev;
 	struct delta_mjpeg_ctx *ctx = to_ctx(pctx);
 	int ret;
 	struct delta_au au = *pau;
 	unsigned int data_offset = 0;
 	struct mjpeg_header *header = &ctx->header_struct;

 	if (!ctx->header) {
 		ret = delta_mjpeg_read_header(pctx, au.vaddr, au.size,
 					      header, &data_offset);
 		if (ret) {
 			pctx->stream_errors++;
 			goto err;
 		}
 		if (header->frame_width * header->frame_height >
 		    DELTA_MJPEG_MAX_RESO) {
 			dev_err(delta->dev,
 				"%s  stream resolution too large: %dx%d > %d pixels budget\n",
 				pctx->name,
 				header->frame_width,
 				header->frame_height, DELTA_MJPEG_MAX_RESO);
 			ret = -EINVAL;
 			goto err;
 		}
 		ctx->header = header;
 		goto out;
 	}

 	if (!ctx->ipc_hdl) {
 		ret = delta_mjpeg_ipc_open(pctx);
 		if (ret)
 			goto err;
 	}

 	ret = delta_mjpeg_read_header(pctx, au.vaddr, au.size,
 				      ctx->header, &data_offset);
 	if (ret) {
 		pctx->stream_errors++;
 		goto err;
 	}

 	au.paddr += data_offset;
 	au.vaddr += data_offset;

 	ret = delta_mjpeg_ipc_decode(pctx, &au);
 	if (ret)
 		goto err;

 out:
 	return 0;

 err:
 	return ret;
 }

 static int delta_mjpeg_get_frame(struct delta_ctx *pctx,
 				 struct delta_frame **frame)
 {
 	struct delta_mjpeg_ctx *ctx = to_ctx(pctx);

 	if (!ctx->out_frame)
 		return -ENODATA;

 	*frame = ctx->out_frame;

 	ctx->out_frame = NULL;

 	return 0;
 }

 const struct delta_dec mjpegdec = {
 	.name = "MJPEG",
 	.streamformat = V4L2_PIX_FMT_MJPEG,
 	.pixelformat = V4L2_PIX_FMT_NV12,
 	.open = delta_mjpeg_open,
 	.close = delta_mjpeg_close,
 	.get_streaminfo = delta_mjpeg_get_streaminfo,
 	.get_frameinfo = delta_get_frameinfo_default,
 	.decode = delta_mjpeg_decode,
 	.get_frame = delta_mjpeg_get_frame,
 	.recycle = delta_recycle_default,
 };
	/*
	* Copyright (C) STMicroelectronics SA 2013
	* Author: Hugues Fruchet <hugues.fruchet@st.com> for STMicroelectronics.
	* License terms: GNU General Public License (GPL), version 2
	*/

	#include <linux/slab.h>

	#include "delta.h"
	#include "delta-ipc.h"
	#include "delta-mjpeg.h"
	#include "delta-mjpeg-fw.h"

	#define DELTA_MJPEG_MAX_RESO DELTA_MAX_RESO

	struct delta_mjpeg_ctx {
	/* jpeg header */
	struct mjpeg_header header_struct;
	struct mjpeg_header *header;

	/* ipc */
	void *ipc_hdl;
	struct delta_buf *ipc_buf;

	/* decoded output frame */
	struct delta_frame *out_frame;

	unsigned char str[3000];
	};

	#define to_ctx(ctx) ((struct delta_mjpeg_ctx *)(ctx)->priv)

	static char ipc_open_param_str(struct jpeg_video_decode_init_params_t p,
	char *str, unsigned int len)
	{
	char *b = str;

	if (!p)
	return "";

	b += snprintf(b, len,
	"jpeg_video_decode_init_params_t\n"
	"circular_buffer_begin_addr_p 0x%x\n"
	"circular_buffer_end_addr_p 0x%x\n",
	p->circular_buffer_begin_addr_p,
	p->circular_buffer_end_addr_p);

	return str;
	}

	static char ipc_decode_param_str(struct jpeg_decode_params_t p,
	char *str, unsigned int len)
	{
	char *b = str;

	if (!p)
	return "";

	b += snprintf(b, len,
	"jpeg_decode_params_t\n"
	"picture_start_addr_p 0x%x\n"
	"picture_end_addr_p 0x%x\n"
	"decoding_mode %d\n"
	"display_buffer_addr.display_decimated_luma_p 0x%x\n"
	"display_buffer_addr.display_decimated_chroma_p 0x%x\n"
	"main_aux_enable %d\n"
	"additional_flags 0x%x\n"
	"field_flag %x\n"
	"is_jpeg_image %x\n",
	p->picture_start_addr_p,
	p->picture_end_addr_p,
	p->decoding_mode,
	p->display_buffer_addr.display_decimated_luma_p,
	p->display_buffer_addr.display_decimated_chroma_p,
	p->main_aux_enable, p->additional_flags,
	p->field_flag,
	p->is_jpeg_image);

	return str;
	}

	static inline bool is_stream_error(enum jpeg_decoding_error_t err)
	{
	switch (err) {
	case JPEG_DECODER_UNDEFINED_HUFF_TABLE:
	case JPEG_DECODER_BAD_RESTART_MARKER:
	case JPEG_DECODER_BAD_SOS_SPECTRAL:
	case JPEG_DECODER_BAD_SOS_SUCCESSIVE:
	case JPEG_DECODER_BAD_HEADER_LENGTH:
	case JPEG_DECODER_BAD_COUNT_VALUE:
	case JPEG_DECODER_BAD_DHT_MARKER:
	case JPEG_DECODER_BAD_INDEX_VALUE:
	case JPEG_DECODER_BAD_NUMBER_HUFFMAN_TABLES:
	case JPEG_DECODER_BAD_QUANT_TABLE_LENGTH:
	case JPEG_DECODER_BAD_NUMBER_QUANT_TABLES:
	case JPEG_DECODER_BAD_COMPONENT_COUNT:
	return true;
	default:
	return false;
	}
	}

	static inline const char *err_str(enum jpeg_decoding_error_t err)
	{
	switch (err) {
	case JPEG_DECODER_NO_ERROR:
	return "JPEG_DECODER_NO_ERROR";
	case JPEG_DECODER_UNDEFINED_HUFF_TABLE:
	return "JPEG_DECODER_UNDEFINED_HUFF_TABLE";
	case JPEG_DECODER_UNSUPPORTED_MARKER:
	return "JPEG_DECODER_UNSUPPORTED_MARKER";
	case JPEG_DECODER_UNABLE_ALLOCATE_MEMORY:
	return "JPEG_DECODER_UNABLE_ALLOCATE_MEMORY";
	case JPEG_DECODER_NON_SUPPORTED_SAMP_FACTORS:
	return "JPEG_DECODER_NON_SUPPORTED_SAMP_FACTORS";
	case JPEG_DECODER_BAD_PARAMETER:
	return "JPEG_DECODER_BAD_PARAMETER";
	case JPEG_DECODER_DECODE_ERROR:
	return "JPEG_DECODER_DECODE_ERROR";
	case JPEG_DECODER_BAD_RESTART_MARKER:
	return "JPEG_DECODER_BAD_RESTART_MARKER";
	case JPEG_DECODER_UNSUPPORTED_COLORSPACE:
	return "JPEG_DECODER_UNSUPPORTED_COLORSPACE";
	case JPEG_DECODER_BAD_SOS_SPECTRAL:
	return "JPEG_DECODER_BAD_SOS_SPECTRAL";
	case JPEG_DECODER_BAD_SOS_SUCCESSIVE:
	return "JPEG_DECODER_BAD_SOS_SUCCESSIVE";
	case JPEG_DECODER_BAD_HEADER_LENGTH:
	return "JPEG_DECODER_BAD_HEADER_LENGTH";
	case JPEG_DECODER_BAD_COUNT_VALUE:
	return "JPEG_DECODER_BAD_COUNT_VALUE";
	case JPEG_DECODER_BAD_DHT_MARKER:
	return "JPEG_DECODER_BAD_DHT_MARKER";
	case JPEG_DECODER_BAD_INDEX_VALUE:
	return "JPEG_DECODER_BAD_INDEX_VALUE";
	case JPEG_DECODER_BAD_NUMBER_HUFFMAN_TABLES:
	return "JPEG_DECODER_BAD_NUMBER_HUFFMAN_TABLES";
	case JPEG_DECODER_BAD_QUANT_TABLE_LENGTH:
	return "JPEG_DECODER_BAD_QUANT_TABLE_LENGTH";
	case JPEG_DECODER_BAD_NUMBER_QUANT_TABLES:
	return "JPEG_DECODER_BAD_NUMBER_QUANT_TABLES";
	case JPEG_DECODER_BAD_COMPONENT_COUNT:
	return "JPEG_DECODER_BAD_COMPONENT_COUNT";
	case JPEG_DECODER_DIVIDE_BY_ZERO_ERROR:
	return "JPEG_DECODER_DIVIDE_BY_ZERO_ERROR";
	case JPEG_DECODER_NOT_JPG_IMAGE:
	return "JPEG_DECODER_NOT_JPG_IMAGE";
	case JPEG_DECODER_UNSUPPORTED_ROTATION_ANGLE:
	return "JPEG_DECODER_UNSUPPORTED_ROTATION_ANGLE";
	case JPEG_DECODER_UNSUPPORTED_SCALING:
	return "JPEG_DECODER_UNSUPPORTED_SCALING";
	case JPEG_DECODER_INSUFFICIENT_OUTPUTBUFFER_SIZE:
	return "JPEG_DECODER_INSUFFICIENT_OUTPUTBUFFER_SIZE";
	case JPEG_DECODER_BAD_HWCFG_GP_VERSION_VALUE:
	return "JPEG_DECODER_BAD_HWCFG_GP_VERSION_VALUE";
	case JPEG_DECODER_BAD_VALUE_FROM_RED:
	return "JPEG_DECODER_BAD_VALUE_FROM_RED";
	case JPEG_DECODER_BAD_SUBREGION_PARAMETERS:
	return "JPEG_DECODER_BAD_SUBREGION_PARAMETERS";
	case JPEG_DECODER_PROGRESSIVE_DECODE_NOT_SUPPORTED:
	return "JPEG_DECODER_PROGRESSIVE_DECODE_NOT_SUPPORTED";
	case JPEG_DECODER_ERROR_TASK_TIMEOUT:
	return "JPEG_DECODER_ERROR_TASK_TIMEOUT";
	case JPEG_DECODER_ERROR_FEATURE_NOT_SUPPORTED:
	return "JPEG_DECODER_ERROR_FEATURE_NOT_SUPPORTED";
	default:
	return "!unknown MJPEG error!";
	}
	}

	static bool delta_mjpeg_check_status(struct delta_ctx *pctx,
	struct jpeg_decode_return_params_t *status)
	{
	struct delta_dev *delta = pctx->dev;
	bool dump = false;

	if (status->error_code == JPEG_DECODER_NO_ERROR)
	goto out;

	if (is_stream_error(status->error_code)) {
	dev_warn_ratelimited(delta->dev,
	"%s firmware: stream error @ frame %d (%s)\n",
	pctx->name, pctx->decoded_frames,
	err_str(status->error_code));
	pctx->stream_errors++;
	} else {
	dev_warn_ratelimited(delta->dev,
	"%s firmware: decode error @ frame %d (%s)\n",
	pctx->name, pctx->decoded_frames,
	err_str(status->error_code));
	pctx->decode_errors++;
	dump = true;
	}

	out:
	dev_dbg(delta->dev,
	"%s firmware: decoding time(us)=%d\n", pctx->name,
	status->decode_time_in_us);

	return dump;
	}

	static int delta_mjpeg_ipc_open(struct delta_ctx *pctx)
	{
	struct delta_dev *delta = pctx->dev;
	struct delta_mjpeg_ctx *ctx = to_ctx(pctx);
	int ret = 0;
	struct jpeg_video_decode_init_params_t params_struct;
	struct jpeg_video_decode_init_params_t *params = &params_struct;
	struct delta_buf *ipc_buf;
	u32 ipc_buf_size;
	struct delta_ipc_param ipc_param;
	void *hdl;

	memset(params, 0, sizeof(*params));
	params->circular_buffer_begin_addr_p = 0x00000000;
	params->circular_buffer_end_addr_p = 0xffffffff;

	dev_vdbg(delta->dev,
	"%s %s\n", pctx->name,
	ipc_open_param_str(params, ctx->str, sizeof(ctx->str)));

	ipc_param.size = sizeof(*params);
	ipc_param.data = params;
	ipc_buf_size = sizeof(struct jpeg_decode_params_t) +
	sizeof(struct jpeg_decode_return_params_t);
	ret = delta_ipc_open(pctx, "JPEG_DECODER_HW0", &ipc_param,
	ipc_buf_size, &ipc_buf, &hdl);
	if (ret) {
	dev_err(delta->dev,
	"%s dumping command %s\n", pctx->name,
	ipc_open_param_str(params, ctx->str, sizeof(ctx->str)));
	return ret;
	}

	ctx->ipc_buf = ipc_buf;
	ctx->ipc_hdl = hdl;

	return 0;
	}

	static int delta_mjpeg_ipc_decode(struct delta_ctx pctx, struct delta_au au)
	{
	struct delta_dev *delta = pctx->dev;
	struct delta_mjpeg_ctx *ctx = to_ctx(pctx);
	int ret = 0;
	struct jpeg_decode_params_t *params = ctx->ipc_buf->vaddr;
	struct jpeg_decode_return_params_t *status =
	ctx->ipc_buf->vaddr + sizeof(*params);
	struct delta_frame *frame;
	struct delta_ipc_param ipc_param, ipc_status;

	ret = delta_get_free_frame(pctx, &frame);
	if (ret)
	return ret;

	memset(params, 0, sizeof(*params));

	params->picture_start_addr_p = (u32)(au->paddr);
	params->picture_end_addr_p = (u32)(au->paddr + au->size - 1);

	/*
	* !WARNING!
	* the NV12 decoded frame is only available
	* on decimated output when enabling flag
	* "JPEG_ADDITIONAL_FLAG_420MB"...
	* the non decimated output gives YUV422SP
	*/
	params->main_aux_enable = JPEG_DISP_AUX_EN;
	params->additional_flags = JPEG_ADDITIONAL_FLAG_420MB;
	params->horizontal_decimation_factor = JPEG_HDEC_1;
	params->vertical_decimation_factor = JPEG_VDEC_1;
	params->decoding_mode = JPEG_NORMAL_DECODE;

	params->display_buffer_addr.struct_size =
	sizeof(struct jpeg_display_buffer_address_t);
	params->display_buffer_addr.display_decimated_luma_p =
	(u32)frame->paddr;
	params->display_buffer_addr.display_decimated_chroma_p =
	(u32)(frame->paddr
	+ frame->info.aligned_width * frame->info.aligned_height);

	dev_vdbg(delta->dev,
	"%s %s\n", pctx->name,
	ipc_decode_param_str(params, ctx->str, sizeof(ctx->str)));

	/* status */
	memset(status, 0, sizeof(*status));
	status->error_code = JPEG_DECODER_NO_ERROR;

	ipc_param.size = sizeof(*params);
	ipc_param.data = params;
	ipc_status.size = sizeof(*status);
	ipc_status.data = status;
	ret = delta_ipc_decode(ctx->ipc_hdl, &ipc_param, &ipc_status);
	if (ret) {
	dev_err(delta->dev,
	"%s dumping command %s\n", pctx->name,
	ipc_decode_param_str(params, ctx->str,
	sizeof(ctx->str)));
	return ret;
	}

	pctx->decoded_frames++;

	/* check firmware decoding status */
	if (delta_mjpeg_check_status(pctx, status)) {
	dev_err(delta->dev,
	"%s dumping command %s\n", pctx->name,
	ipc_decode_param_str(params, ctx->str,
	sizeof(ctx->str)));
	}

	frame->field = V4L2_FIELD_NONE;
	frame->flags = V4L2_BUF_FLAG_KEYFRAME;
	frame->state \|= DELTA_FRAME_DEC;

	ctx->out_frame = frame;

	return 0;
	}

	static int delta_mjpeg_open(struct delta_ctx *pctx)
	{
	struct delta_mjpeg_ctx *ctx;

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

	return 0;
	}

	static int delta_mjpeg_close(struct delta_ctx *pctx)
	{
	struct delta_mjpeg_ctx *ctx = to_ctx(pctx);

	if (ctx->ipc_hdl) {
	delta_ipc_close(ctx->ipc_hdl);
	ctx->ipc_hdl = NULL;
	}

	kfree(ctx);

	return 0;
	}

	static int delta_mjpeg_get_streaminfo(struct delta_ctx *pctx,
	struct delta_streaminfo *streaminfo)
	{
	struct delta_mjpeg_ctx *ctx = to_ctx(pctx);

	if (!ctx->header)
	goto nodata;

	streaminfo->streamformat = V4L2_PIX_FMT_MJPEG;
	streaminfo->width = ctx->header->frame_width;
	streaminfo->height = ctx->header->frame_height;

	/* progressive stream */
	streaminfo->field = V4L2_FIELD_NONE;

	streaminfo->dpb = 1;

	return 0;

	nodata:
	return -ENODATA;
	}

	static int delta_mjpeg_decode(struct delta_ctx pctx, struct delta_au pau)
	{
	struct delta_dev *delta = pctx->dev;
	struct delta_mjpeg_ctx *ctx = to_ctx(pctx);
	int ret;
	struct delta_au au = *pau;
	unsigned int data_offset = 0;
	struct mjpeg_header *header = &ctx->header_struct;

	if (!ctx->header) {
	ret = delta_mjpeg_read_header(pctx, au.vaddr, au.size,
	header, &data_offset);
	if (ret) {
	pctx->stream_errors++;
	goto err;
	}
	if (header->frame_width * header->frame_height >
	DELTA_MJPEG_MAX_RESO) {
	dev_err(delta->dev,
	"%s stream resolution too large: %dx%d > %d pixels budget\n",
	pctx->name,
	header->frame_width,
	header->frame_height, DELTA_MJPEG_MAX_RESO);
	ret = -EINVAL;
	goto err;
	}
	ctx->header = header;
	goto out;
	}

	if (!ctx->ipc_hdl) {
	ret = delta_mjpeg_ipc_open(pctx);
	if (ret)
	goto err;
	}

	ret = delta_mjpeg_read_header(pctx, au.vaddr, au.size,
	ctx->header, &data_offset);
	if (ret) {
	pctx->stream_errors++;
	goto err;
	}

	au.paddr += data_offset;
	au.vaddr += data_offset;

	ret = delta_mjpeg_ipc_decode(pctx, &au);
	if (ret)
	goto err;

	out:
	return 0;

	err:
	return ret;
	}

	static int delta_mjpeg_get_frame(struct delta_ctx *pctx,
	struct delta_frame **frame)
	{
	struct delta_mjpeg_ctx *ctx = to_ctx(pctx);

	if (!ctx->out_frame)
	return -ENODATA;

	*frame = ctx->out_frame;

	ctx->out_frame = NULL;

	return 0;
	}

	const struct delta_dec mjpegdec = {
	.name = "MJPEG",
	.streamformat = V4L2_PIX_FMT_MJPEG,
	.pixelformat = V4L2_PIX_FMT_NV12,
	.open = delta_mjpeg_open,
	.close = delta_mjpeg_close,
	.get_streaminfo = delta_mjpeg_get_streaminfo,
	.get_frameinfo = delta_get_frameinfo_default,
	.decode = delta_mjpeg_decode,
	.get_frame = delta_mjpeg_get_frame,
	.recycle = delta_recycle_default,
	};