Staging: sst: Intel SST audio driver

This is the Intel SST audio driver.

As compared to the previous versions it has all the printks and other stuff
noted cleaned up and more hardware support. The Aava support is disabled in
this patch (is_aava resolves to 0) because the Aava board detection logic
is not yet upstream.

The driver itself is a combination of a traditional ALSA driver and a
hardware assisted offload driver which can play audio while the processor
is asleep but which can't do all the more interactive stuff.

In the general case most software would use the ALSA interface, but the
other interface is needed for certain classes of use such as music playback
on highly power consumption sensitive devices.

This is going to staging primarily because it depends upon the staging memrar
driver.

Signed-off-by: Vinod Koul <vinod.koul@intel.com>
Signed-off-by: Harsha Priya <priya.harsha@intel.com>
[Merged together and tweaked for -next]
Signed-off-by: Alan Cox <alan@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

1 files changed, 1275 insertions, 0 deletions

diff --git a/drivers/staging/intel_sst/intel_sst_stream_encoded.c b/drivers/staging/intel_sst/intel_sst_stream_encoded.c
new file mode 100644
index 0000000..fbae39f
--- /dev/null
+++ b/drivers/staging/intel_sst/intel_sst_stream_encoded.c
@@ -0,0 +1,1275 @@
+/*
+ *  intel_sst_stream.c - Intel SST Driver for audio engine
+ *
+ *  Copyright (C) 2008-10 Intel Corp
+ *  Authors:	Vinod Koul <vinod.koul@intel.com>
+ *		Harsha Priya <priya.harsha@intel.com>
+ *		Dharageswari R <dharageswari.r@intel.com>
+ *		KP Jeeja <jeeja.kp@intel.com>
+ *  ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+ *
+ *  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; version 2 of the License.
+ *
+ *  This program is distributed in the hope that it will be useful, but
+ *  WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ *  General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License along
+ *  with this program; if not, write to the Free Software Foundation, Inc.,
+ *  59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
+ *
+ * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+ *
+ *  This file contains the stream operations of SST driver
+ */
+
+#include <linux/pci.h>
+#include <linux/syscalls.h>
+#include <linux/firmware.h>
+#include <linux/sched.h>
+#include <linux/rar_register.h>
+#ifdef CONFIG_MRST_RAR_HANDLER
+#include "../../../drivers/staging/memrar/memrar.h"
+#endif
+#include "intel_sst_ioctl.h"
+#include "intel_sst.h"
+#include "intel_sst_fw_ipc.h"
+#include "intel_sst_common.h"
+/**
+* sst_get_stream_params - Send msg to query for stream parameters
+* @str_id:	stream id for which the parameters are queried for
+* @get_params:	out parameters to which the parameters are copied to
+*
+* This function is called when the stream parameters are queiried for
+*/
+int sst_get_stream_params(int str_id,
+			struct snd_sst_get_stream_params *get_params)
+{
+	int retval = 0;
+	struct ipc_post *msg = NULL;
+	struct stream_info *str_info;
+	struct snd_sst_fw_get_stream_params *fw_params;
+
+	pr_debug("sst: get_stream for %d\n", str_id);
+	retval = sst_validate_strid(str_id);
+	if (retval)
+		return retval;
+
+	str_info = &sst_drv_ctx->streams[str_id];
+	if (str_info->status != STREAM_UN_INIT) {
+		if (str_info->ctrl_blk.on == true) {
+			pr_err("sst: control path in use\n");
+			return -EINVAL;
+		}
+		if (sst_create_short_msg(&msg)) {
+			pr_err("sst: message creation failed\n");
+			return -ENOMEM;
+		}
+		fw_params = kzalloc(sizeof(*fw_params), GFP_ATOMIC);
+		if (!fw_params) {
+			pr_err("sst: mem allcoation failed\n ");
+			kfree(msg);
+			return -ENOMEM;
+		}
+
+		sst_fill_header(&msg->header, IPC_IA_GET_STREAM_PARAMS,
+					0, str_id);
+		str_info->ctrl_blk.condition = false;
+		str_info->ctrl_blk.ret_code = 0;
+		str_info->ctrl_blk.on = true;
+		str_info->ctrl_blk.data = (void *) fw_params;
+		spin_lock(&sst_drv_ctx->list_spin_lock);
+		list_add_tail(&msg->node, &sst_drv_ctx->ipc_dispatch_list);
+		spin_unlock(&sst_drv_ctx->list_spin_lock);
+		sst_post_message(&sst_drv_ctx->ipc_post_msg_wq);
+		retval = sst_wait_interruptible_timeout(sst_drv_ctx,
+				&str_info->ctrl_blk, SST_BLOCK_TIMEOUT);
+		if (retval) {
+			get_params->codec_params.result = retval;
+			kfree(fw_params);
+			return -EIO;
+		}
+		memcpy(&get_params->pcm_params, &fw_params->pcm_params,
+				sizeof(fw_params->pcm_params));
+		memcpy(&get_params->codec_params.sparams,
+				&fw_params->codec_params,
+				sizeof(fw_params->codec_params));
+		get_params->codec_params.result = 0;
+		get_params->codec_params.stream_id = str_id;
+		get_params->codec_params.codec = str_info->codec;
+		get_params->codec_params.ops = str_info->ops;
+		get_params->codec_params.stream_type = str_info->str_type;
+		kfree(fw_params);
+	} else {
+		pr_debug("sst: Stream is not in the init state\n");
+	}
+	return retval;
+}
+
+/**
+ * sst_set_stream_param - Send msg for setting stream parameters
+ *
+ * @str_id: stream id
+ * @str_param: stream params
+ *
+ * This function sets stream params during runtime
+ */
+int sst_set_stream_param(int str_id, struct snd_sst_params *str_param)
+{
+	int retval = 0;
+	struct ipc_post *msg = NULL;
+	struct stream_info *str_info;
+
+	BUG_ON(!str_param);
+	if (sst_drv_ctx->streams[str_id].ops != str_param->ops) {
+		pr_err("sst: Invalid operation\n");
+		return -EINVAL;
+	}
+	retval = sst_validate_strid(str_id);
+	if (retval)
+		return retval;
+	pr_debug("sst: set_stream for %d\n", str_id);
+	str_info =  &sst_drv_ctx->streams[str_id];
+	if (sst_drv_ctx->streams[str_id].status == STREAM_INIT) {
+		if (str_info->ctrl_blk.on == true) {
+			pr_err("sst: control path in use\n");
+			return -EAGAIN;
+		}
+		if (sst_create_large_msg(&msg))
+			return -ENOMEM;
+
+		sst_fill_header(&msg->header,
+				IPC_IA_SET_STREAM_PARAMS, 1, str_id);
+		str_info->ctrl_blk.condition = false;
+		str_info->ctrl_blk.ret_code = 0;
+		str_info->ctrl_blk.on = true;
+		msg->header.part.data = sizeof(u32) +
+				sizeof(str_param->sparams);
+		memcpy(msg->mailbox_data, &msg->header, sizeof(u32));
+		memcpy(msg->mailbox_data + sizeof(u32), &str_param->sparams,
+				sizeof(str_param->sparams));
+		spin_lock(&sst_drv_ctx->list_spin_lock);
+		list_add_tail(&msg->node, &sst_drv_ctx->ipc_dispatch_list);
+		spin_unlock(&sst_drv_ctx->list_spin_lock);
+		sst_post_message(&sst_drv_ctx->ipc_post_msg_wq);
+		retval = sst_wait_interruptible_timeout(sst_drv_ctx,
+				&str_info->ctrl_blk, SST_BLOCK_TIMEOUT);
+		if (retval < 0) {
+			retval = -EIO;
+			sst_clean_stream(str_info);
+		}
+	} else {
+		retval = -EBADRQC;
+		pr_err("sst: BADQRC for stream\n");
+	}
+	return retval;
+}
+
+/**
+* sst_get_vol - This fuction allows to get the premix gain or gain of a stream
+*
+* @get_vol: this is an output param through which the volume
+*	structure is passed back to user
+*
+* This function is called when the premix gain or stream gain is queried for
+*/
+int sst_get_vol(struct snd_sst_vol *get_vol)
+{
+	int retval = 0;
+	struct ipc_post *msg = NULL;
+	struct snd_sst_vol *fw_get_vol;
+	int str_id = get_vol->stream_id;
+
+	pr_debug("sst: get vol called\n");
+
+	if (sst_create_short_msg(&msg))
+		return -ENOMEM;
+
+	sst_fill_header(&msg->header,
+				IPC_IA_GET_STREAM_VOL, 0, str_id);
+	sst_drv_ctx->vol_info_blk.condition = false;
+	sst_drv_ctx->vol_info_blk.ret_code = 0;
+	sst_drv_ctx->vol_info_blk.on = true;
+	fw_get_vol = kzalloc(sizeof(*fw_get_vol), GFP_ATOMIC);
+	if (!fw_get_vol) {
+		pr_err("sst: mem allocation failed\n");
+		kfree(msg);
+		return -ENOMEM;
+	}
+	sst_drv_ctx->vol_info_blk.data = (void *)fw_get_vol;
+	spin_lock(&sst_drv_ctx->list_spin_lock);
+	list_add_tail(&msg->node, &sst_drv_ctx->ipc_dispatch_list);
+	spin_unlock(&sst_drv_ctx->list_spin_lock);
+	sst_post_message(&sst_drv_ctx->ipc_post_msg_wq);
+	retval = sst_wait_interruptible_timeout(sst_drv_ctx,
+			&sst_drv_ctx->vol_info_blk, SST_BLOCK_TIMEOUT);
+	if (retval)
+		retval = -EIO;
+	else {
+		pr_debug("sst: stream id %d\n", fw_get_vol->stream_id);
+		pr_debug("sst: volume %d\n", fw_get_vol->volume);
+		pr_debug("sst: ramp duration %d\n", fw_get_vol->ramp_duration);
+		pr_debug("sst: ramp_type %d\n", fw_get_vol->ramp_type);
+		memcpy(get_vol, fw_get_vol, sizeof(*fw_get_vol));
+	}
+	return retval;
+}
+
+/**
+* sst_set_vol - This fuction allows to set the premix gain or gain of a stream
+*
+* @set_vol:	this holds the volume structure that needs to be set
+*
+* This function is called when premix gain or stream gain is requested to be set
+*/
+int sst_set_vol(struct snd_sst_vol *set_vol)
+{
+
+	int retval = 0;
+	struct ipc_post *msg = NULL;
+
+	pr_debug("sst: set vol called\n");
+
+	if (sst_create_large_msg(&msg)) {
+		pr_err("sst: message creation failed\n");
+		return -ENOMEM;
+	}
+	sst_fill_header(&msg->header, IPC_IA_SET_STREAM_VOL, 1,
+				set_vol->stream_id);
+
+	msg->header.part.data = sizeof(u32) + sizeof(*set_vol);
+	memcpy(msg->mailbox_data, &msg->header, sizeof(u32));
+	memcpy(msg->mailbox_data + sizeof(u32), set_vol, sizeof(*set_vol));
+	sst_drv_ctx->vol_info_blk.condition = false;
+	sst_drv_ctx->vol_info_blk.ret_code = 0;
+	sst_drv_ctx->vol_info_blk.on = true;
+	sst_drv_ctx->vol_info_blk.data = set_vol;
+	spin_lock(&sst_drv_ctx->list_spin_lock);
+	list_add_tail(&msg->node, &sst_drv_ctx->ipc_dispatch_list);
+	spin_unlock(&sst_drv_ctx->list_spin_lock);
+	sst_post_message(&sst_drv_ctx->ipc_post_msg_wq);
+	retval = sst_wait_interruptible_timeout(sst_drv_ctx,
+			&sst_drv_ctx->vol_info_blk, SST_BLOCK_TIMEOUT);
+	if (retval) {
+		pr_err("sst: error in set_vol = %d\n", retval);
+		retval = -EIO;
+	}
+	return retval;
+}
+
+/**
+* sst_set_mute - This fuction sets premix mute or soft mute of a stream
+*
+* @set_mute:	this holds the mute structure that needs to be set
+*
+* This function is called when premix mute or stream mute requested to be set
+*/
+int sst_set_mute(struct snd_sst_mute *set_mute)
+{
+
+	int retval = 0;
+	struct ipc_post *msg = NULL;
+
+	pr_debug("sst: set mute called\n");
+
+	if (sst_create_large_msg(&msg)) {
+		pr_err("sst: message creation failed\n");
+		return -ENOMEM;
+	}
+	sst_fill_header(&msg->header, IPC_IA_SET_STREAM_MUTE, 1,
+				set_mute->stream_id);
+	sst_drv_ctx->mute_info_blk.condition = false;
+	sst_drv_ctx->mute_info_blk.ret_code = 0;
+	sst_drv_ctx->mute_info_blk.on = true;
+	sst_drv_ctx->mute_info_blk.data = set_mute;
+
+	msg->header.part.data = sizeof(u32) + sizeof(*set_mute);
+	memcpy(msg->mailbox_data, &msg->header, sizeof(u32));
+	memcpy(msg->mailbox_data + sizeof(u32), set_mute,
+			sizeof(*set_mute));
+	spin_lock(&sst_drv_ctx->list_spin_lock);
+	list_add_tail(&msg->node, &sst_drv_ctx->ipc_dispatch_list);
+	spin_unlock(&sst_drv_ctx->list_spin_lock);
+	sst_post_message(&sst_drv_ctx->ipc_post_msg_wq);
+	retval = sst_wait_interruptible_timeout(sst_drv_ctx,
+			&sst_drv_ctx->mute_info_blk, SST_BLOCK_TIMEOUT);
+	if (retval) {
+		pr_err("sst: error in set_mute = %d\n", retval);
+		retval = -EIO;
+	}
+	return retval;
+}
+
+int sst_prepare_target(struct snd_sst_slot_info *slot)
+{
+	if (slot->target_device == SND_SST_TARGET_PMIC
+		&& slot->device_instance == 1) {
+			/*music mode*/
+			if (sst_drv_ctx->pmic_port_instance == 0)
+				sst_drv_ctx->scard_ops->set_voice_port(
+					DEACTIVATE);
+	} else if ((slot->target_device == SND_SST_TARGET_PMIC ||
+			slot->target_device == SND_SST_TARGET_MODEM) &&
+			slot->device_instance == 0) {
+				/*voip mode where pcm0 is active*/
+				if (sst_drv_ctx->pmic_port_instance == 1)
+					sst_drv_ctx->scard_ops->set_audio_port(
+						DEACTIVATE);
+	}
+	return 0;
+}
+
+int sst_activate_target(struct snd_sst_slot_info *slot)
+{
+	if (slot->target_device == SND_SST_TARGET_PMIC &&
+		slot->device_instance == 1) {
+			/*music mode*/
+			sst_drv_ctx->pmic_port_instance = 1;
+			sst_drv_ctx->scard_ops->set_audio_port(ACTIVATE);
+			sst_drv_ctx->scard_ops->set_pcm_audio_params(
+				slot->pcm_params.sfreq,
+				slot->pcm_params.pcm_wd_sz,
+				slot->pcm_params.num_chan);
+			if (sst_drv_ctx->pb_streams)
+				sst_drv_ctx->scard_ops->power_up_pmic_pb(1);
+			if (sst_drv_ctx->cp_streams)
+				sst_drv_ctx->scard_ops->power_up_pmic_cp(1);
+	} else if ((slot->target_device == SND_SST_TARGET_PMIC ||
+			slot->target_device == SND_SST_TARGET_MODEM) &&
+			slot->device_instance == 0) {
+				/*voip mode where pcm0 is active*/
+				sst_drv_ctx->pmic_port_instance = 0;
+				sst_drv_ctx->scard_ops->set_voice_port(
+					ACTIVATE);
+				sst_drv_ctx->scard_ops->power_up_pmic_pb(0);
+				/*sst_drv_ctx->scard_ops->power_up_pmic_cp(0);*/
+	}
+	return 0;
+}
+
+int sst_parse_target(struct snd_sst_slot_info *slot)
+{
+	int retval = 0;
+
+	if (slot->action == SND_SST_PORT_ACTIVATE &&
+		slot->device_type == SND_SST_DEVICE_PCM) {
+			retval = sst_activate_target(slot);
+			if (retval)
+				pr_err("sst: SST_Activate_target_fail\n");
+			else
+				pr_err("sst: SST_Activate_target_pass\n");
+		return retval;
+	} else if (slot->action == SND_SST_PORT_PREPARE &&
+			slot->device_type == SND_SST_DEVICE_PCM) {
+				retval = sst_prepare_target(slot);
+			if (retval)
+				pr_err("sst: SST_prepare_target_fail\n");
+			else
+				pr_err("sst: SST_prepare_target_pass\n");
+			return retval;
+	} else {
+		pr_err("sst: slot_action : %d, device_type: %d\n",
+				slot->action, slot->device_type);
+		return retval;
+	}
+}
+
+int sst_send_target(struct snd_sst_target_device *target)
+{
+	int retval;
+	struct ipc_post *msg;
+
+	if (sst_create_large_msg(&msg)) {
+		pr_err("sst: message creation failed\n");
+		return -ENOMEM;
+	}
+	sst_fill_header(&msg->header, IPC_IA_TARGET_DEV_SELECT, 1, 0);
+	sst_drv_ctx->tgt_dev_blk.condition = false;
+	sst_drv_ctx->tgt_dev_blk.ret_code = 0;
+	sst_drv_ctx->tgt_dev_blk.on = true;
+
+	msg->header.part.data = sizeof(u32) + sizeof(*target);
+	memcpy(msg->mailbox_data, &msg->header, sizeof(u32));
+	memcpy(msg->mailbox_data + sizeof(u32), target,
+			sizeof(*target));
+	spin_lock(&sst_drv_ctx->list_spin_lock);
+	list_add_tail(&msg->node, &sst_drv_ctx->ipc_dispatch_list);
+	spin_unlock(&sst_drv_ctx->list_spin_lock);
+	sst_post_message(&sst_drv_ctx->ipc_post_msg_wq);
+	pr_debug("sst: message sent- waiting\n");
+	retval = sst_wait_interruptible_timeout(sst_drv_ctx,
+			&sst_drv_ctx->tgt_dev_blk, TARGET_DEV_BLOCK_TIMEOUT);
+	if (retval)
+		pr_err("sst: target device ipc failed = 0x%x\n", retval);
+	return retval;
+
+}
+
+int sst_target_device_validate(struct snd_sst_target_device *target)
+{
+	int retval = 0;
+       int i;
+
+	for (i = 0; i < SST_MAX_TARGET_DEVICES; i++) {
+		if (target->devices[i].device_type == SND_SST_DEVICE_PCM) {
+			/*pcm device, check params*/
+			if (target->devices[i].device_instance == 1) {
+				if ((target->devices[i].device_mode !=
+				SND_SST_DEV_MODE_PCM_MODE4_I2S) &&
+				(target->devices[i].device_mode !=
+				SND_SST_DEV_MODE_PCM_MODE4_RIGHT_JUSTIFIED)
+				&& (target->devices[i].device_mode !=
+				SND_SST_DEV_MODE_PCM_MODE1))
+					goto err;
+			} else if (target->devices[i].device_instance == 0) {
+				if ((target->devices[i].device_mode !=
+						SND_SST_DEV_MODE_PCM_MODE2)
+					&& (target->devices[i].device_mode !=
+						SND_SST_DEV_MODE_PCM_MODE4_I2S)
+					&& (target->devices[i].device_mode !=
+						SND_SST_DEV_MODE_PCM_MODE1))
+					goto err;
+				if (target->devices[i].pcm_params.sfreq != 8000
+				|| target->devices[i].pcm_params.num_chan != 1
+				|| target->devices[i].pcm_params.pcm_wd_sz !=
+									16)
+					goto err;
+			} else {
+err:
+				pr_err("sst: i/p params incorrect\n");
+				return -EINVAL;
+			}
+		}
+	}
+    return retval;
+}
+
+/**
+ * sst_target_device_select - This fuction sets the target device configurations
+ *
+ * @target: this parameter holds the configurations to be set
+ *
+ * This function is called when the user layer wants to change the target
+ * device's configurations
+ */
+
+int sst_target_device_select(struct snd_sst_target_device *target)
+{
+	int retval, i, prepare_count = 0;
+
+	pr_debug("sst: Target Device Select\n");
+
+	if (target->device_route < 0 || target->device_route > 2) {
+		pr_err("sst: device route is invalid\n");
+		return -EINVAL;
+	}
+
+	if (target->device_route != 0) {
+		pr_err("sst: Unsupported config\n");
+		return -EIO;
+	}
+	retval = sst_target_device_validate(target);
+	if (retval)
+		return retval;
+
+	retval = sst_send_target(target);
+	if (retval)
+		return retval;
+	for (i = 0; i < SST_MAX_TARGET_DEVICES; i++) {
+		if (target->devices[i].action == SND_SST_PORT_ACTIVATE) {
+			pr_debug("sst: activate called in %d\n", i);
+			retval = sst_parse_target(&target->devices[i]);
+			if (retval)
+				return retval;
+		} else if (target->devices[i].action == SND_SST_PORT_PREPARE) {
+			pr_debug("sst: PREPARE in %d, Forwading\n", i);
+			retval = sst_parse_target(&target->devices[i]);
+			if (retval) {
+				pr_err("sst: Parse Target fail %d", retval);
+				return retval;
+			}
+			pr_debug("sst: Parse Target successful %d", retval);
+			if (target->devices[i].device_type ==
+						SND_SST_DEVICE_PCM)
+				prepare_count++;
+		}
+	}
+	if (target->devices[0].action == SND_SST_PORT_PREPARE &&
+		prepare_count == 0)
+			sst_drv_ctx->scard_ops->power_down_pmic();
+
+	return retval;
+}
+#ifdef CONFIG_MRST_RAR_HANDLER
+/*This function gets the physical address of the secure memory from the handle*/
+static inline int sst_get_RAR(struct RAR_buffer *buffers, int count)
+{
+	int retval = 0, rar_status = 0;
+
+	rar_status = rar_handle_to_bus(buffers, count);
+
+	if (count != rar_status) {
+		pr_err("sst: The rar CALL Failed");
+		retval = -EIO;
+	}
+	if (buffers->info.type != RAR_TYPE_AUDIO) {
+		pr_err("sst: Invalid RAR type\n");
+		return -EINVAL;
+	}
+	return retval;
+}
+
+#endif
+
+/* This function creates the scatter gather list to be sent to firmware to
+capture/playback data*/
+static int sst_create_sg_list(struct stream_info *stream,
+		struct sst_frame_info *sg_list)
+{
+	struct sst_stream_bufs *kbufs = NULL;
+#ifdef CONFIG_MRST_RAR_HANDLER
+	struct RAR_buffer rar_buffers;
+	int retval = 0;
+#endif
+	int i = 0;
+	list_for_each_entry(kbufs, &stream->bufs, node) {
+		if (kbufs->in_use == false) {
+#ifdef CONFIG_MRST_RAR_HANDLER
+			if (stream->ops == STREAM_OPS_PLAYBACK_DRM) {
+				pr_debug("sst: DRM playback handling\n");
+				rar_buffers.info.handle = (__u32)kbufs->addr;
+				rar_buffers.info.size = kbufs->size;
+				pr_debug("sst: rar handle 0x%x size=0x%x",
+					rar_buffers.info.handle,
+					rar_buffers.info.size);
+				retval =  sst_get_RAR(&rar_buffers, 1);
+
+				if (retval)
+					return retval;
+				sg_list->addr[i].addr = rar_buffers.bus_address;
+				/* rar_buffers.info.size; */
+				sg_list->addr[i].size = (__u32)kbufs->size;
+				pr_debug("sst: phyaddr[%d] 0x%x Size:0x%x\n"
+					, i, sg_list->addr[i].addr,
+					sg_list->addr[i].size);
+			}
+#endif
+			if (stream->ops != STREAM_OPS_PLAYBACK_DRM) {
+				sg_list->addr[i].addr =
+					virt_to_phys((void *)
+						kbufs->addr + kbufs->offset);
+				sg_list->addr[i].size = kbufs->size;
+				pr_debug("sst: phyaddr[%d]:0x%x Size:0x%x\n"
+				, i , sg_list->addr[i].addr, kbufs->size);
+			}
+			stream->curr_bytes += sg_list->addr[i].size;
+			kbufs->in_use = true;
+			i++;
+		}
+		if (i >= MAX_NUM_SCATTER_BUFFERS)
+			break;
+	}
+
+	sg_list->num_entries = i;
+	pr_debug("sst:sg list entries = %d\n", sg_list->num_entries);
+	return i;
+}
+
+
+/**
+ * sst_play_frame - Send msg for sending stream frames
+ *
+ * @str_id:	ID of stream
+ *
+ * This function is called to send data to be played out
+ * to the firmware
+ */
+int sst_play_frame(int str_id)
+{
+	int i = 0, retval = 0;
+	struct ipc_post *msg = NULL;
+	struct sst_frame_info sg_list = {0};
+	struct sst_stream_bufs *kbufs = NULL, *_kbufs;
+	struct stream_info *stream;
+
+	pr_debug("sst: play frame for %d\n", str_id);
+	retval = sst_validate_strid(str_id);
+	if (retval)
+		return retval;
+
+	stream = &sst_drv_ctx->streams[str_id];
+	/* clear prev sent buffers */
+	list_for_each_entry_safe(kbufs, _kbufs, &stream->bufs, node) {
+		if (kbufs->in_use == true) {
+			spin_lock(&stream->pcm_lock);
+			list_del(&kbufs->node);
+			spin_unlock(&stream->pcm_lock);
+			kfree(kbufs);
+		}
+	}
+	/* update bytes sent */
+	stream->cumm_bytes += stream->curr_bytes;
+	stream->curr_bytes = 0;
+	if (list_empty(&stream->bufs)) {
+		/* no user buffer available */
+		pr_debug("sst: Null buffer stream status %d\n", stream->status);
+		stream->prev = stream->status;
+		stream->status = STREAM_INIT;
+		pr_debug("sst:new stream status = %d\n", stream->status);
+		if (stream->need_draining == true) {
+			pr_debug("sst:draining stream\n");
+			if (sst_create_short_msg(&msg)) {
+				pr_err("sst: mem alloc failed\n");
+				return -ENOMEM;
+			}
+			sst_fill_header(&msg->header, IPC_IA_DRAIN_STREAM,
+						0, str_id);
+			spin_lock(&sst_drv_ctx->list_spin_lock);
+			list_add_tail(&msg->node,
+					&sst_drv_ctx->ipc_dispatch_list);
+			spin_unlock(&sst_drv_ctx->list_spin_lock);
+			sst_post_message(&sst_drv_ctx->ipc_post_msg_wq);
+		} else if (stream->data_blk.on == true) {
+			pr_debug("sst:user list empty.. wake\n");
+			/* unblock */
+			stream->data_blk.ret_code = 0;
+			stream->data_blk.condition = true;
+			stream->data_blk.on = false;
+			wake_up(&sst_drv_ctx->wait_queue);
+		}
+		return 0;
+	}
+
+	/* create list */
+	i = sst_create_sg_list(stream, &sg_list);
+
+	/* post msg */
+	if (sst_create_large_msg(&msg))
+		return -ENOMEM;
+
+	sst_fill_header(&msg->header, IPC_IA_PLAY_FRAMES, 1, str_id);
+	msg->header.part.data = sizeof(u32) + sizeof(sg_list);
+	memcpy(msg->mailbox_data, &msg->header, sizeof(u32));
+	memcpy(msg->mailbox_data + sizeof(u32), &sg_list, sizeof(sg_list));
+	spin_lock(&sst_drv_ctx->list_spin_lock);
+	list_add_tail(&msg->node, &sst_drv_ctx->ipc_dispatch_list);
+	spin_unlock(&sst_drv_ctx->list_spin_lock);
+	sst_post_message(&sst_drv_ctx->ipc_post_msg_wq);
+	return 0;
+
+}
+
+/**
+ * sst_capture_frame - Send msg for sending stream frames
+ *
+ * @str_id:	ID of stream
+ *
+ * This function is called to capture data from the firmware
+ */
+int sst_capture_frame(int str_id)
+{
+	int i = 0, retval = 0;
+	struct ipc_post *msg = NULL;
+	struct sst_frame_info sg_list = {0};
+	struct sst_stream_bufs *kbufs = NULL, *_kbufs;
+	struct stream_info *stream;
+
+
+	pr_debug("sst:capture frame for %d\n", str_id);
+	retval = sst_validate_strid(str_id);
+	if (retval)
+		return retval;
+	stream = &sst_drv_ctx->streams[str_id];
+	/* clear prev sent buffers */
+	list_for_each_entry_safe(kbufs, _kbufs, &stream->bufs, node) {
+		if (kbufs->in_use == true) {
+			list_del(&kbufs->node);
+			kfree(kbufs);
+			pr_debug("sst:del node\n");
+		}
+	}
+	if (list_empty(&stream->bufs)) {
+		/* no user buffer available */
+		pr_debug("sst:Null buffer!!!!stream status %d\n",
+			       stream->status);
+		stream->prev = stream->status;
+		stream->status = STREAM_INIT;
+		pr_debug("sst:new stream status = %d\n",
+			       stream->status);
+		if (stream->data_blk.on == true) {
+			pr_debug("sst:user list empty.. wake\n");
+			/* unblock */
+			stream->data_blk.ret_code = 0;
+			stream->data_blk.condition = true;
+			stream->data_blk.on = false;
+			wake_up(&sst_drv_ctx->wait_queue);
+
+		}
+		return 0;
+	}
+	/* create new sg list */
+	i = sst_create_sg_list(stream, &sg_list);
+
+	/* post msg */
+	if (sst_create_large_msg(&msg))
+		return -ENOMEM;
+
+	sst_fill_header(&msg->header, IPC_IA_CAPT_FRAMES, 1, str_id);
+	msg->header.part.data = sizeof(u32) + sizeof(sg_list);
+	memcpy(msg->mailbox_data, &msg->header, sizeof(u32));
+	memcpy(msg->mailbox_data + sizeof(u32), &sg_list, sizeof(sg_list));
+	spin_lock(&sst_drv_ctx->list_spin_lock);
+	list_add_tail(&msg->node, &sst_drv_ctx->ipc_dispatch_list);
+	spin_unlock(&sst_drv_ctx->list_spin_lock);
+	sst_post_message(&sst_drv_ctx->ipc_post_msg_wq);
+
+
+	/*update bytes recevied*/
+	stream->cumm_bytes += stream->curr_bytes;
+	stream->curr_bytes = 0;
+
+    pr_debug("sst:Cum bytes  = %d\n", stream->cumm_bytes);
+	return 0;
+}
+
+/*This function is used to calculate the minimum size of input buffers given*/
+static unsigned int calculate_min_size(struct snd_sst_buffs *bufs)
+{
+	int i, min_val = bufs->buff_entry[0].size;
+	for (i = 1 ; i < bufs->entries; i++) {
+		if (bufs->buff_entry[i].size < min_val)
+			min_val = bufs->buff_entry[i].size;
+	}
+	pr_debug("sst:min_val = %d\n", min_val);
+	return min_val;
+}
+
+static unsigned int calculate_max_size(struct snd_sst_buffs *bufs)
+{
+	int i, max_val = bufs->buff_entry[0].size;
+	for (i = 1 ; i < bufs->entries; i++) {
+		if (bufs->buff_entry[i].size > max_val)
+			max_val = bufs->buff_entry[i].size;
+	}
+	pr_debug("sst:max_val = %d\n", max_val);
+	return max_val;
+}
+
+/*This function is used to allocate input and output buffers to be sent to
+the firmware that will take encoded data and return decoded data*/
+static int sst_allocate_decode_buf(struct stream_info *str_info,
+				struct snd_sst_dbufs *dbufs,
+				unsigned int cum_input_given,
+				unsigned int cum_output_given)
+{
+#ifdef CONFIG_MRST_RAR_HANDLER
+	if (str_info->ops == STREAM_OPS_PLAYBACK_DRM) {
+
+		if (dbufs->ibufs->type == SST_BUF_RAR  &&
+			dbufs->obufs->type == SST_BUF_RAR) {
+			if (dbufs->ibufs->entries == dbufs->obufs->entries)
+				return 0;
+			else {
+				pr_err("sst: RAR entries dont match\n");
+				 return -EINVAL;
+			}
+		} else
+			str_info->decode_osize = cum_output_given;
+		return 0;
+
+	}
+#endif
+	if (!str_info->decode_ibuf) {
+		pr_debug("sst:no i/p buffers, trying full size\n");
+		str_info->decode_isize = cum_input_given;
+		str_info->decode_ibuf = kzalloc(str_info->decode_isize,
+						GFP_KERNEL);
+		str_info->idecode_alloc = str_info->decode_isize;
+	}
+	if (!str_info->decode_ibuf) {
+		pr_debug("sst:buff alloc failed, try max size\n");
+		str_info->decode_isize = calculate_max_size(dbufs->ibufs);
+		str_info->decode_ibuf = kzalloc(
+				str_info->decode_isize, GFP_KERNEL);
+		str_info->idecode_alloc = str_info->decode_isize;
+	}
+	if (!str_info->decode_ibuf) {
+		pr_debug("sst:buff alloc failed, try min size\n");
+		str_info->decode_isize = calculate_min_size(dbufs->ibufs);
+		str_info->decode_ibuf = kzalloc(str_info->decode_isize,
+						GFP_KERNEL);
+		if (!str_info->decode_ibuf) {
+			pr_err("sst: mem allocation failed\n");
+			return -ENOMEM;
+		}
+		str_info->idecode_alloc = str_info->decode_isize;
+	}
+	str_info->decode_osize = cum_output_given;
+	if (str_info->decode_osize > sst_drv_ctx->mmap_len)
+		str_info->decode_osize = sst_drv_ctx->mmap_len;
+	return 0;
+}
+
+/*This function is used to send the message to firmware to decode the data*/
+static int sst_send_decode_mess(int str_id, struct stream_info *str_info,
+				struct snd_sst_decode_info *dec_info)
+{
+	struct ipc_post *msg = NULL;
+	int retval = 0;
+
+	pr_debug("SST DBGsst_set_mute:called\n");
+
+	if (str_info->decode_ibuf_type == SST_BUF_RAR) {
+#ifdef CONFIG_MRST_RAR_HANDLER
+			dec_info->frames_in.addr[0].addr =
+				(unsigned long)str_info->decode_ibuf;
+			dec_info->frames_in.addr[0].size =
+							str_info->decode_isize;
+#endif
+
+	} else {
+		dec_info->frames_in.addr[0].addr = virt_to_phys((void *)
+					str_info->decode_ibuf);
+		dec_info->frames_in.addr[0].size = str_info->decode_isize;
+	}
+
+
+	if (str_info->decode_obuf_type == SST_BUF_RAR) {
+#ifdef CONFIG_MRST_RAR_HANDLER
+		dec_info->frames_out.addr[0].addr =
+				(unsigned long)str_info->decode_obuf;
+		dec_info->frames_out.addr[0].size = str_info->decode_osize;
+#endif
+
+	} else {
+		dec_info->frames_out.addr[0].addr = virt_to_phys((void *)
+						str_info->decode_obuf) ;
+		dec_info->frames_out.addr[0].size = str_info->decode_osize;
+	}
+
+	dec_info->frames_in.num_entries = 1;
+	dec_info->frames_out.num_entries = 1;
+	dec_info->frames_in.rsrvd = 0;
+	dec_info->frames_out.rsrvd = 0;
+	dec_info->input_bytes_consumed = 0;
+	dec_info->output_bytes_produced = 0;
+	if (sst_create_large_msg(&msg)) {
+		pr_err("sst: message creation failed\n");
+		return -ENOMEM;
+	}
+
+	sst_fill_header(&msg->header, IPC_IA_DECODE_FRAMES, 1, str_id);
+	msg->header.part.data = sizeof(u32) + sizeof(*dec_info);
+	memcpy(msg->mailbox_data, &msg->header, sizeof(u32));
+	memcpy(msg->mailbox_data + sizeof(u32), dec_info,
+			sizeof(*dec_info));
+	spin_lock(&sst_drv_ctx->list_spin_lock);
+	list_add_tail(&msg->node, &sst_drv_ctx->ipc_dispatch_list);
+	spin_unlock(&sst_drv_ctx->list_spin_lock);
+	str_info->data_blk.condition = false;
+	str_info->data_blk.ret_code = 0;
+	str_info->data_blk.on = true;
+	str_info->data_blk.data = dec_info;
+	sst_post_message(&sst_drv_ctx->ipc_post_msg_wq);
+	retval = sst_wait_interruptible(sst_drv_ctx, &str_info->data_blk);
+	return retval;
+}
+
+static int sst_prepare_input_buffers_rar(struct stream_info *str_info,
+			struct snd_sst_dbufs *dbufs,
+			int *input_index, int *in_copied,
+			int *input_index_valid_size, int *new_entry_flag)
+{
+	int retval = 0;
+#ifdef CONFIG_MRST_RAR_HANDLER
+	int i;
+
+	if (str_info->ops == STREAM_OPS_PLAYBACK_DRM) {
+		struct RAR_buffer rar_buffers;
+		__u32 info;
+		retval = copy_from_user((void *) &info,
+				dbufs->ibufs->buff_entry[i].buffer,
+				sizeof(__u32));
+		if (retval) {
+			pr_err("sst:cpy from user fail\n");
+			return -EAGAIN;
+		}
+		rar_buffers.info.type = dbufs->ibufs->type;
+		rar_buffers.info.size = dbufs->ibufs->buff_entry[i].size;
+		rar_buffers.info.handle =  info;
+		pr_debug("rar in DnR(input buffer function)=0x%x size=0x%x",
+				rar_buffers.info.handle,
+				rar_buffers.info.size);
+		retval =  sst_get_RAR(&rar_buffers, 1);
+		if (retval) {
+			pr_debug("SST ERR: RAR API failed\n");
+			return retval;
+		}
+		str_info->decode_ibuf =
+		(void *) ((unsigned long) rar_buffers.bus_address);
+		pr_debug("RAR buf addr in DnR (input buffer function)0x%lu",
+				 (unsigned long) str_info->decode_ibuf);
+		pr_debug("rar in DnR decode funtion/output b_add rar =0x%lu",
+				(unsigned long) rar_buffers.bus_address);
+		*input_index = i + 1;
+		str_info->decode_isize = dbufs->ibufs->buff_entry[i].size;
+		str_info->decode_ibuf_type = dbufs->ibufs->type;
+		*in_copied = str_info->decode_isize;
+	}
+#endif
+	return retval;
+}
+/*This function is used to prepare the kernel input buffers with contents
+before sending for decode*/
+static int sst_prepare_input_buffers(struct stream_info *str_info,
+			struct snd_sst_dbufs *dbufs,
+			int *input_index, int *in_copied,
+			int *input_index_valid_size, int *new_entry_flag)
+{
+	int i, cpy_size, retval = 0;
+
+	pr_debug("sst:input_index = %d, input entries = %d\n",
+			 *input_index, dbufs->ibufs->entries);
+	for (i = *input_index; i < dbufs->ibufs->entries; i++) {
+#ifdef CONFIG_MRST_RAR_HANDLER
+		retval = sst_prepare_input_buffers_rar(str_info,
+			dbufs, input_index, in_copied,
+				input_index_valid_size, new_entry_flag);
+		if (retval) {
+			pr_err("sst: In prepare input buffers for RAR\n");
+			return -EIO;
+		}
+#endif
+		*input_index = i;
+		if (*input_index_valid_size == 0)
+			*input_index_valid_size =
+				dbufs->ibufs->buff_entry[i].size;
+		pr_debug("sst:inout addr = %p, size = %d\n",
+			dbufs->ibufs->buff_entry[i].buffer,
+			*input_index_valid_size);
+		pr_debug("sst:decode_isize = %d, in_copied %d\n",
+			str_info->decode_isize, *in_copied);
+		if (*input_index_valid_size <=
+					(str_info->decode_isize - *in_copied))
+			cpy_size = *input_index_valid_size;
+		else
+			cpy_size = str_info->decode_isize - *in_copied;
+
+		pr_debug("sst:cpy size = %d\n", cpy_size);
+		if (!dbufs->ibufs->buff_entry[i].buffer) {
+			pr_err("sst: i/p buffer is null\n");
+			return -EINVAL;
+		}
+		pr_debug("sst:Try copy To %p, From %p, size %d\n",
+				str_info->decode_ibuf + *in_copied,
+				dbufs->ibufs->buff_entry[i].buffer, cpy_size);
+
+		retval =
+		copy_from_user((void *)(str_info->decode_ibuf + *in_copied),
+				(void *) dbufs->ibufs->buff_entry[i].buffer,
+				cpy_size);
+		if (retval) {
+			pr_err("sst: copy from user failed\n");
+			return -EIO;
+		}
+		*in_copied += cpy_size;
+		*input_index_valid_size -= cpy_size;
+		pr_debug("sst:in buff size = %d, in_copied = %d\n",
+			*input_index_valid_size, *in_copied);
+		if (*input_index_valid_size != 0) {
+			pr_debug("sst:more input buffers left\n");
+			dbufs->ibufs->buff_entry[i].buffer += cpy_size;
+			break;
+		}
+		if (*in_copied == str_info->decode_isize &&
+			*input_index_valid_size == 0 &&
+			(i+1) <= dbufs->ibufs->entries) {
+			pr_debug("sst:all input buffers copied\n");
+			*new_entry_flag = true;
+			*input_index = i + 1;
+			break;
+		}
+	}
+	return retval;
+}
+
+/* This function is used to copy the decoded data from kernel buffers to
+the user output buffers with contents after decode*/
+static int sst_prepare_output_buffers(struct stream_info *str_info,
+			struct snd_sst_dbufs *dbufs,
+			int *output_index, int output_size,
+			int *out_copied)
+
+{
+	int i, cpy_size, retval = 0;
+	pr_debug("sst:output_index = %d, output entries = %d\n",
+				*output_index,
+				dbufs->obufs->entries);
+	for (i = *output_index; i < dbufs->obufs->entries; i++) {
+		*output_index = i;
+		pr_debug("sst:output addr = %p, size = %d\n",
+			dbufs->obufs->buff_entry[i].buffer,
+			dbufs->obufs->buff_entry[i].size);
+		pr_debug("sst:output_size = %d, out_copied = %d\n",
+				output_size, *out_copied);
+		if (dbufs->obufs->buff_entry[i].size <
+				(output_size - *out_copied))
+			cpy_size = dbufs->obufs->buff_entry[i].size;
+		else
+			cpy_size = output_size - *out_copied;
+		pr_debug("sst:cpy size = %d\n", cpy_size);
+		pr_debug("sst:Try copy To: %p, From %p, size %d\n",
+				dbufs->obufs->buff_entry[i].buffer,
+				sst_drv_ctx->mmap_mem + *out_copied,
+				cpy_size);
+		retval = copy_to_user(dbufs->obufs->buff_entry[i].buffer,
+					sst_drv_ctx->mmap_mem + *out_copied,
+					cpy_size);
+		if (retval) {
+			pr_err("sst: copy to user failed\n");
+			return -EIO;
+		} else
+			pr_debug("sst:copy to user passed\n");
+		*out_copied += cpy_size;
+		dbufs->obufs->buff_entry[i].size -= cpy_size;
+		pr_debug("sst:o/p buff size %d, out_copied %d\n",
+			dbufs->obufs->buff_entry[i].size, *out_copied);
+		if (dbufs->obufs->buff_entry[i].size != 0) {
+			*output_index = i;
+			dbufs->obufs->buff_entry[i].buffer += cpy_size;
+			break;
+		} else if (*out_copied == output_size) {
+			*output_index = i + 1;
+			break;
+		}
+	}
+	return retval;
+}
+
+/**
+ * sst_decode - Send msg for decoding frames
+ *
+ * @str_id: ID of stream
+ * @dbufs: param that holds the user input and output buffers and size
+ *
+ * This function is called to decode data from the firmware
+ */
+int sst_decode(int str_id, struct snd_sst_dbufs *dbufs)
+{
+	int retval = 0, i;
+	unsigned long long total_input = 0 , total_output = 0;
+	unsigned int cum_input_given = 0 , cum_output_given = 0;
+	int copy_in_done = false, copy_out_done = false;
+	int input_index = 0, output_index = 0;
+	int input_index_valid_size = 0;
+	int in_copied, out_copied;
+	int new_entry_flag;
+	u64 output_size;
+	struct stream_info *str_info;
+	struct snd_sst_decode_info dec_info;
+	unsigned long long input_bytes, output_bytes;
+
+	sst_drv_ctx->scard_ops->power_down_pmic();
+	pr_debug("sst: Powering_down_PMIC...\n");
+
+	retval = sst_validate_strid(str_id);
+	if (retval)
+		return retval;
+
+	str_info = &sst_drv_ctx->streams[str_id];
+	if (str_info->status != STREAM_INIT) {
+		pr_err("sst: invalid stream state = %d\n",
+			       str_info->status);
+		return -EINVAL;
+	}
+
+	str_info->prev = str_info->status;
+	str_info->status = STREAM_DECODE;
+
+	for (i = 0; i < dbufs->ibufs->entries; i++)
+		cum_input_given += dbufs->ibufs->buff_entry[i].size;
+	for (i = 0; i < dbufs->obufs->entries; i++)
+		cum_output_given += dbufs->obufs->buff_entry[i].size;
+
+	/* input and output buffer allocation */
+	retval =  sst_allocate_decode_buf(str_info, dbufs,
+				cum_input_given, cum_output_given);
+	if (retval) {
+		pr_err("sst: mem allocation failed, abort!!!\n");
+		retval = -ENOMEM;
+		goto finish;
+	}
+
+	str_info->decode_isize = str_info->idecode_alloc;
+	str_info->decode_ibuf_type = dbufs->ibufs->type;
+	str_info->decode_obuf_type = dbufs->obufs->type;
+
+	while ((copy_out_done == false) && (copy_in_done == false)) {
+		in_copied = 0;
+		new_entry_flag = false;
+		retval = sst_prepare_input_buffers(str_info,\
+			dbufs, &input_index, &in_copied,
+			&input_index_valid_size, &new_entry_flag);
+		if (retval) {
+			pr_err("sst: prepare in buffers failed\n");
+			goto finish;
+		}
+
+		if (str_info->ops != STREAM_OPS_PLAYBACK_DRM)
+			str_info->decode_obuf = sst_drv_ctx->mmap_mem;
+
+#ifdef CONFIG_MRST_RAR_HANDLER
+		else {
+			if (dbufs->obufs->type == SST_BUF_RAR) {
+				struct RAR_buffer rar_buffers;
+				__u32 info;
+
+				pr_debug("DRM");
+				retval = copy_from_user((void *) &info,
+						dbufs->obufs->
+						buff_entry[output_index].buffer,
+						sizeof(__u32));
+
+				rar_buffers.info.size = dbufs->obufs->
+					buff_entry[output_index].size;
+				rar_buffers.info.handle =  info;
+				retval =  sst_get_RAR(&rar_buffers, 1);
+				if (retval)
+					return retval;
+
+				str_info->decode_obuf = (void *)((unsigned long)
+						rar_buffers.bus_address);
+				str_info->decode_osize = dbufs->obufs->
+					buff_entry[output_index].size;
+				str_info->decode_obuf_type = dbufs->obufs->type;
+				pr_debug("sst:DRM handling\n");
+				pr_debug("o/p_add=0x%lu Size=0x%x",
+					(unsigned long) str_info->decode_obuf,
+					str_info->decode_osize);
+			} else {
+				str_info->decode_obuf = sst_drv_ctx->mmap_mem;
+				str_info->decode_osize = dbufs->obufs->
+					buff_entry[output_index].size;
+
+			}
+		}
+#endif
+		if (str_info->ops != STREAM_OPS_PLAYBACK_DRM) {
+			if (str_info->decode_isize > in_copied) {
+				str_info->decode_isize = in_copied;
+				pr_debug("sst:i/p size = %d\n",
+						str_info->decode_isize);
+			}
+		}
+
+
+		retval = sst_send_decode_mess(str_id, str_info, &dec_info);
+		if (retval || dec_info.input_bytes_consumed == 0) {
+			pr_err(
+				"SST ERR: mess failed or no input consumed\n");
+			goto finish;
+		}
+		input_bytes = dec_info.input_bytes_consumed;
+		output_bytes = dec_info.output_bytes_produced;
+
+		pr_debug("sst:in_copied=%d, con=%lld, prod=%lld\n",
+			in_copied, input_bytes, output_bytes);
+		if (dbufs->obufs->type == SST_BUF_RAR) {
+			output_index += 1;
+			if (output_index == dbufs->obufs->entries) {
+				copy_in_done = true;
+				pr_debug("sst:all i/p cpy done\n");
+			}
+			total_output += output_bytes;
+		} else {
+			out_copied = 0;
+			output_size = output_bytes;
+			retval = sst_prepare_output_buffers(str_info, dbufs,
+				&output_index, output_size, &out_copied);
+			if (retval) {
+				pr_err("sst:prep out buff fail\n");
+				goto finish;
+			}
+			if (str_info->ops != STREAM_OPS_PLAYBACK_DRM) {
+				if (in_copied != input_bytes) {
+					int bytes_left = in_copied -
+								input_bytes;
+					pr_debug("sst:bytes %d\n",
+							bytes_left);
+					if (new_entry_flag == true)
+						input_index--;
+					while (bytes_left) {
+						struct snd_sst_buffs *ibufs;
+						struct snd_sst_buff_entry
+								*buff_entry;
+						unsigned int size_sent;
+
+						ibufs = dbufs->ibufs;
+						buff_entry =
+						&ibufs->buff_entry[input_index];
+						size_sent = buff_entry->size -\
+							input_index_valid_size;
+						if (bytes_left == size_sent) {
+								bytes_left = 0;
+						} else if (bytes_left <
+								size_sent) {
+							buff_entry->buffer +=
+							 (size_sent -
+								bytes_left);
+							buff_entry->size -=
+							 (size_sent -
+								bytes_left);
+							bytes_left = 0;
+						} else {
+							bytes_left -= size_sent;
+							input_index--;
+							input_index_valid_size =
+									0;
+						}
+					}
+
+				}
+			}
+
+			total_output += out_copied;
+			if (str_info->decode_osize != out_copied) {
+				str_info->decode_osize -= out_copied;
+				pr_debug("sst:output size modified = %d\n",
+						str_info->decode_osize);
+			}
+		}
+		total_input += input_bytes;
+
+		if (str_info->ops == STREAM_OPS_PLAYBACK_DRM) {
+			if (total_input == cum_input_given)
+				copy_in_done = true;
+			copy_out_done = true;
+
+		} else {
+			if (total_output == cum_output_given) {
+				copy_out_done = true;
+				pr_debug("sst:all o/p cpy done\n");
+			}
+
+			if (total_input == cum_input_given) {
+				copy_in_done = true;
+				pr_debug("sst:all i/p cpy done\n");
+			}
+		}
+
+		pr_debug("sst:copy_out = %d, copy_in = %d\n",
+				copy_out_done, copy_in_done);
+	}
+
+finish:
+	dbufs->input_bytes_consumed = total_input;
+	dbufs->output_bytes_produced = total_output;
+	str_info->status = str_info->prev;
+	str_info->prev = STREAM_DECODE;
+	str_info->decode_ibuf = NULL;
+	kfree(str_info->decode_ibuf);
+	return retval;
+}