This refactored code for start/stop streaming vb2 operations and
adds a state machine handling similar to the one in stateful codec
API documentation. One major change is that now the HFI session is
started on STREAMON(OUTPUT) and stopped on REQBUF(OUTPUT,count=0),
during that time streamoff(cap,out) just flush buffers but doesn't
stop the session. The other major change is that now the capture
and output queues are completely separated.

Signed-off-by: Stanimir Varbanov <stanimir.varba...@linaro.org>
---
 drivers/media/platform/qcom/venus/core.h    |  20 +-
 drivers/media/platform/qcom/venus/helpers.c |  23 +-
 drivers/media/platform/qcom/venus/helpers.h |   5 +
 drivers/media/platform/qcom/venus/vdec.c    | 449 ++++++++++++++++----
 4 files changed, 389 insertions(+), 108 deletions(-)

diff --git a/drivers/media/platform/qcom/venus/core.h 
b/drivers/media/platform/qcom/venus/core.h
index 79c7e816c706..5a133c203455 100644
--- a/drivers/media/platform/qcom/venus/core.h
+++ b/drivers/media/platform/qcom/venus/core.h
@@ -218,6 +218,15 @@ struct venus_buffer {
 
 #define to_venus_buffer(ptr)   container_of(ptr, struct venus_buffer, vb)
 
+#define DEC_STATE_UNINIT               0
+#define DEC_STATE_INIT                 1
+#define DEC_STATE_CAPTURE_SETUP                2
+#define DEC_STATE_STOPPED              3
+#define DEC_STATE_SEEK                 4
+#define DEC_STATE_DRAIN                        5
+#define DEC_STATE_DECODING             6
+#define DEC_STATE_DRC                  7
+
 /**
  * struct venus_inst - holds per instance paramerters
  *
@@ -241,6 +250,10 @@ struct venus_buffer {
  * @colorspace:        current color space
  * @quantization:      current quantization
  * @xfer_func: current xfer function
+ * @codec_state:       current codec API state (see DEC/ENC_STATE_)
+ * @reconf_wait:       wait queue for resolution change event
+ * @ten_bits:          does new stream is 10bits depth
+ * @buf_count:         used to count number number of buffers (reqbuf(0))
  * @fps:               holds current FPS
  * @timeperframe:      holds current time per frame structure
  * @fmt_out:   a reference to output format structure
@@ -255,8 +268,6 @@ struct venus_buffer {
  * @opb_buftype:       output picture buffer type
  * @opb_fmt:           output picture buffer raw format
  * @reconfig:  a flag raised by decoder when the stream resolution changed
- * @reconfig_width:    holds the new width
- * @reconfig_height:   holds the new height
  * @hfi_codec:         current codec for this instance in HFI space
  * @sequence_cap:      a sequence counter for capture queue
  * @sequence_out:      a sequence counter for output queue
@@ -296,6 +307,9 @@ struct venus_inst {
        u8 ycbcr_enc;
        u8 quantization;
        u8 xfer_func;
+       unsigned int codec_state;
+       wait_queue_head_t reconf_wait;
+       int buf_count;
        u64 fps;
        struct v4l2_fract timeperframe;
        const struct venus_format *fmt_out;
@@ -310,8 +324,6 @@ struct venus_inst {
        u32 opb_buftype;
        u32 opb_fmt;
        bool reconfig;
-       u32 reconfig_width;
-       u32 reconfig_height;
        u32 hfi_codec;
        u32 sequence_cap;
        u32 sequence_out;
diff --git a/drivers/media/platform/qcom/venus/helpers.c 
b/drivers/media/platform/qcom/venus/helpers.c
index 637ce7b82d94..25d8cceccae4 100644
--- a/drivers/media/platform/qcom/venus/helpers.c
+++ b/drivers/media/platform/qcom/venus/helpers.c
@@ -1030,16 +1030,15 @@ void venus_helper_vb2_buf_queue(struct vb2_buffer *vb)
 
        v4l2_m2m_buf_queue(m2m_ctx, vbuf);
 
-       if (!(inst->streamon_out & inst->streamon_cap))
-               goto unlock;
-
-       ret = is_buf_refed(inst, vbuf);
-       if (ret)
-               goto unlock;
+       if (IS_OUT(vb->vb2_queue, inst) || IS_CAP(vb->vb2_queue, inst)) {
+               ret = is_buf_refed(inst, vbuf);
+               if (ret)
+                       goto unlock;
 
-       ret = session_process_buf(inst, vbuf);
-       if (ret)
-               return_buf_error(inst, vbuf);
+               ret = session_process_buf(inst, vbuf);
+               if (ret)
+                       return_buf_error(inst, vbuf);
+       }
 
 unlock:
        mutex_unlock(&inst->lock);
@@ -1155,14 +1154,8 @@ int venus_helper_vb2_start_streaming(struct venus_inst 
*inst)
        if (ret)
                goto err_unload_res;
 
-       ret = venus_helper_queue_dpb_bufs(inst);
-       if (ret)
-               goto err_session_stop;
-
        return 0;
 
-err_session_stop:
-       hfi_session_stop(inst);
 err_unload_res:
        hfi_session_unload_res(inst);
 err_unreg_bufs:
diff --git a/drivers/media/platform/qcom/venus/helpers.h 
b/drivers/media/platform/qcom/venus/helpers.h
index 2ec1c1a8b416..3b46139b5ee1 100644
--- a/drivers/media/platform/qcom/venus/helpers.h
+++ b/drivers/media/platform/qcom/venus/helpers.h
@@ -17,6 +17,11 @@
 
 #include <media/videobuf2-v4l2.h>
 
+#define IS_OUT(q, inst) (inst->streamon_out && \
+               q->type == V4L2_BUF_TYPE_VIDEO_OUTPUT_MPLANE)
+#define IS_CAP(q, inst) (inst->streamon_cap && \
+               q->type == V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE)
+
 struct venus_inst;
 struct venus_core;
 
diff --git a/drivers/media/platform/qcom/venus/vdec.c 
b/drivers/media/platform/qcom/venus/vdec.c
index 7a9370df7515..306e0f7d3337 100644
--- a/drivers/media/platform/qcom/venus/vdec.c
+++ b/drivers/media/platform/qcom/venus/vdec.c
@@ -201,28 +201,18 @@ static int vdec_g_fmt(struct file *file, void *fh, struct 
v4l2_format *f)
        struct venus_inst *inst = to_inst(file);
        const struct venus_format *fmt = NULL;
        struct v4l2_pix_format_mplane *pixmp = &f->fmt.pix_mp;
+       int ret;
 
        if (f->type == V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE)
                fmt = inst->fmt_cap;
        else if (f->type == V4L2_BUF_TYPE_VIDEO_OUTPUT_MPLANE)
                fmt = inst->fmt_out;
 
-       if (inst->reconfig) {
-               struct v4l2_format format = {};
-
-               inst->out_width = inst->reconfig_width;
-               inst->out_height = inst->reconfig_height;
-               inst->reconfig = false;
-
-               format.type = V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE;
-               format.fmt.pix_mp.pixelformat = inst->fmt_cap->pixfmt;
-               format.fmt.pix_mp.width = inst->out_width;
-               format.fmt.pix_mp.height = inst->out_height;
-
-               vdec_try_fmt_common(inst, &format);
-
-               inst->width = format.fmt.pix_mp.width;
-               inst->height = format.fmt.pix_mp.height;
+       if (f->type == V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE) {
+               ret = wait_event_timeout(inst->reconf_wait, inst->reconfig,
+                                        msecs_to_jiffies(100));
+               if (!ret)
+                       return -EINVAL;
        }
 
        pixmp->pixelformat = fmt->pixfmt;
@@ -457,6 +447,10 @@ vdec_try_decoder_cmd(struct file *file, void *fh, struct 
v4l2_decoder_cmd *cmd)
                if (cmd->flags & V4L2_DEC_CMD_STOP_TO_BLACK)
                        return -EINVAL;
                break;
+       case V4L2_DEC_CMD_START:
+               if (cmd->flags & V4L2_DEC_CMD_START_MUTE_AUDIO)
+                       return -EINVAL;
+               break;
        default:
                return -EINVAL;
        }
@@ -477,18 +471,23 @@ vdec_decoder_cmd(struct file *file, void *fh, struct 
v4l2_decoder_cmd *cmd)
 
        mutex_lock(&inst->lock);
 
-       /*
-        * Implement V4L2_DEC_CMD_STOP by enqueue an empty buffer on decoder
-        * input to signal EOS.
-        */
-       if (!(inst->streamon_out & inst->streamon_cap))
-               goto unlock;
+       if (cmd->cmd == V4L2_DEC_CMD_STOP) {
+               /*
+                * Implement V4L2_DEC_CMD_STOP by enqueue an empty buffer on
+                * decoder input to signal EOS.
+                */
+               if (!(inst->streamon_out & inst->streamon_cap))
+                       goto unlock;
 
-       fdata.buffer_type = HFI_BUFFER_INPUT;
-       fdata.flags |= HFI_BUFFERFLAG_EOS;
-       fdata.device_addr = 0xdeadbeef;
+               fdata.buffer_type = HFI_BUFFER_INPUT;
+               fdata.flags |= HFI_BUFFERFLAG_EOS;
+               fdata.device_addr = 0xdeadb000;
 
-       ret = hfi_session_process_buf(inst, &fdata);
+               ret = hfi_session_process_buf(inst, &fdata);
+
+               if (!ret && inst->codec_state == DEC_STATE_DECODING)
+                       inst->codec_state = DEC_STATE_DRAIN;
+       }
 
 unlock:
        mutex_unlock(&inst->lock);
@@ -649,20 +648,18 @@ static int vdec_output_conf(struct venus_inst *inst)
        return 0;
 }
 
-static int vdec_init_session(struct venus_inst *inst)
+static int vdec_session_init(struct venus_inst *inst)
 {
        int ret;
 
        ret = hfi_session_init(inst, inst->fmt_out->pixfmt);
-       if (ret)
+       if (ret == -EINVAL)
+               return 0;
+       else if (ret)
                return ret;
 
-       ret = venus_helper_set_input_resolution(inst, inst->out_width,
-                                               inst->out_height);
-       if (ret)
-               goto deinit;
-
-       ret = venus_helper_set_color_format(inst, inst->fmt_cap->pixfmt);
+       ret = venus_helper_set_input_resolution(inst, frame_width_min(inst),
+                                               frame_height_min(inst));
        if (ret)
                goto deinit;
 
@@ -681,26 +678,19 @@ static int vdec_num_buffers(struct venus_inst *inst, 
unsigned int *in_num,
 
        *in_num = *out_num = 0;
 
-       ret = vdec_init_session(inst);
-       if (ret)
-               return ret;
-
        ret = venus_helper_get_bufreq(inst, HFI_BUFFER_INPUT, &bufreq);
        if (ret)
-               goto deinit;
+               return ret;
 
        *in_num = HFI_BUFREQ_COUNT_MIN(&bufreq, ver);
 
        ret = venus_helper_get_bufreq(inst, HFI_BUFFER_OUTPUT, &bufreq);
        if (ret)
-               goto deinit;
+               return ret;
 
        *out_num = HFI_BUFREQ_COUNT_MIN(&bufreq, ver);
 
-deinit:
-       hfi_session_deinit(inst);
-
-       return ret;
+       return 0;
 }
 
 static int vdec_queue_setup(struct vb2_queue *q,
@@ -733,6 +723,10 @@ static int vdec_queue_setup(struct vb2_queue *q,
                return 0;
        }
 
+       ret = vdec_session_init(inst);
+       if (ret)
+               return ret;
+
        ret = vdec_num_buffers(inst, &in_num, &out_num);
        if (ret)
                return ret;
@@ -758,6 +752,11 @@ static int vdec_queue_setup(struct vb2_queue *q,
                inst->output_buf_size = sizes[0];
                *num_buffers = max(*num_buffers, out_num);
                inst->num_output_bufs = *num_buffers;
+
+               mutex_lock(&inst->lock);
+               if (inst->codec_state == DEC_STATE_CAPTURE_SETUP)
+                       inst->codec_state = DEC_STATE_STOPPED;
+               mutex_unlock(&inst->lock);
                break;
        default:
                ret = -EINVAL;
@@ -794,80 +793,298 @@ static int vdec_verify_conf(struct venus_inst *inst)
        return 0;
 }
 
-static int vdec_start_streaming(struct vb2_queue *q, unsigned int count)
+static int vdec_start_capture(struct venus_inst *inst)
 {
-       struct venus_inst *inst = vb2_get_drv_priv(q);
        int ret;
 
-       mutex_lock(&inst->lock);
+       if (!inst->streamon_out)
+               return -EINVAL;
 
-       if (q->type == V4L2_BUF_TYPE_VIDEO_OUTPUT_MPLANE)
-               inst->streamon_out = 1;
-       else
-               inst->streamon_cap = 1;
+       if (inst->codec_state == DEC_STATE_DECODING) {
+               if (inst->reconfig)
+                       goto reconfigure;
 
-       if (!(inst->streamon_out & inst->streamon_cap)) {
-               mutex_unlock(&inst->lock);
+               venus_helper_queue_dpb_bufs(inst);
+               venus_helper_process_initial_cap_bufs(inst);
+               inst->streamon_cap = 1;
                return 0;
        }
 
-       venus_helper_init_instance(inst);
+       if (inst->codec_state != DEC_STATE_STOPPED)
+               return -EINVAL;
 
-       inst->reconfig = false;
-       inst->sequence_cap = 0;
-       inst->sequence_out = 0;
+reconfigure:
+       ret = hfi_session_flush(inst, HFI_FLUSH_OUTPUT);
+       if (ret)
+               return ret;
 
-       ret = vdec_init_session(inst);
+       ret = vdec_output_conf(inst);
        if (ret)
-               goto bufs_done;
+               return ret;
+
+       ret = venus_helper_set_num_bufs(inst, inst->num_input_bufs,
+                                       VB2_MAX_FRAME, VB2_MAX_FRAME);
+       if (ret)
+               return ret;
+
+       ret = venus_helper_intbufs_realloc(inst);
+       if (ret)
+               goto err;
+
+       ret = venus_helper_alloc_dpb_bufs(inst);
+       if (ret)
+               goto err;
+
+       ret = venus_helper_queue_dpb_bufs(inst);
+       if (ret)
+               goto free_dpb_bufs;
+
+       ret = venus_helper_process_initial_cap_bufs(inst);
+       if (ret)
+               goto free_dpb_bufs;
+
+       venus_helper_load_scale_clocks(inst->core);
+
+       ret = hfi_session_continue(inst);
+       if (ret)
+               goto free_dpb_bufs;
+
+       inst->codec_state = DEC_STATE_DECODING;
+
+       inst->streamon_cap = 1;
+       inst->sequence_cap = 0;
+       inst->reconfig = false;
+
+       return 0;
+
+free_dpb_bufs:
+       venus_helper_free_dpb_bufs(inst);
+err:
+       return ret;
+}
+
+static int vdec_start_output(struct venus_inst *inst)
+{
+       int ret;
+
+       if (inst->codec_state == DEC_STATE_SEEK) {
+               ret = venus_helper_process_initial_out_bufs(inst);
+               inst->codec_state = DEC_STATE_DECODING;
+               goto done;
+       }
+
+       if (inst->codec_state == DEC_STATE_INIT ||
+           inst->codec_state == DEC_STATE_CAPTURE_SETUP) {
+               ret = venus_helper_process_initial_out_bufs(inst);
+               goto done;
+       }
+
+       if (inst->codec_state != DEC_STATE_UNINIT)
+               return -EINVAL;
+
+       venus_helper_init_instance(inst);
+       inst->sequence_out = 0;
+       inst->reconfig = false;
 
        ret = vdec_set_properties(inst);
        if (ret)
-               goto deinit_sess;
+               return ret;
 
        ret = vdec_output_conf(inst);
        if (ret)
-               goto deinit_sess;
+               return ret;
 
        ret = vdec_verify_conf(inst);
        if (ret)
-               goto deinit_sess;
+               return ret;
 
        ret = venus_helper_set_num_bufs(inst, inst->num_input_bufs,
                                        VB2_MAX_FRAME, VB2_MAX_FRAME);
        if (ret)
-               goto deinit_sess;
+               return ret;
 
-       ret = venus_helper_alloc_dpb_bufs(inst);
+       ret = venus_helper_vb2_start_streaming(inst);
        if (ret)
-               goto deinit_sess;
+               return ret;
 
-       ret = venus_helper_vb2_start_streaming(inst);
+       ret = venus_helper_process_initial_out_bufs(inst);
        if (ret)
-               goto deinit_sess;
+               return ret;
 
-       mutex_unlock(&inst->lock);
+       inst->codec_state = DEC_STATE_INIT;
+
+done:
+       inst->streamon_out = 1;
+       return ret;
+}
+
+static int vdec_start_streaming(struct vb2_queue *q, unsigned int count)
+{
+       struct venus_inst *inst = vb2_get_drv_priv(q);
+       int ret;
+
+       mutex_lock(&inst->lock);
+
+       if (q->type == V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE)
+               ret = vdec_start_capture(inst);
+       else
+               ret = vdec_start_output(inst);
 
+       if (ret)
+               goto error;
+
+       mutex_unlock(&inst->lock);
        return 0;
 
-deinit_sess:
-       hfi_session_deinit(inst);
-bufs_done:
+error:
        venus_helper_buffers_done(inst, VB2_BUF_STATE_QUEUED);
+       mutex_unlock(&inst->lock);
+       return ret;
+}
+
+static void vdec_dst_buffers_done(struct venus_inst *inst,
+                                 enum vb2_buffer_state state)
+{
+       struct vb2_v4l2_buffer *buf;
+
+       while ((buf = v4l2_m2m_dst_buf_remove(inst->m2m_ctx)))
+               v4l2_m2m_buf_done(buf, state);
+}
+
+static int vdec_stop_capture(struct venus_inst *inst)
+{
+       int ret = 0;
+
+       switch (inst->codec_state) {
+       case DEC_STATE_DECODING:
+               ret = hfi_session_flush(inst, HFI_FLUSH_ALL);
+               vdec_dst_buffers_done(inst, VB2_BUF_STATE_ERROR);
+               inst->codec_state = DEC_STATE_STOPPED;
+               break;
+       case DEC_STATE_DRAIN:
+               vdec_dst_buffers_done(inst, VB2_BUF_STATE_ERROR);
+               inst->codec_state = DEC_STATE_STOPPED;
+               break;
+       case DEC_STATE_DRC:
+               ret = hfi_session_flush(inst, HFI_FLUSH_OUTPUT);
+               vdec_dst_buffers_done(inst, VB2_BUF_STATE_ERROR);
+               inst->codec_state = DEC_STATE_CAPTURE_SETUP;
+               INIT_LIST_HEAD(&inst->registeredbufs);
+               venus_helper_free_dpb_bufs(inst);
+               break;
+       default:
+               return 0;
+       }
+
+       return ret;
+}
+
+static int vdec_stop_output(struct venus_inst *inst)
+{
+       int ret = 0;
+
+       switch (inst->codec_state) {
+       case DEC_STATE_DECODING:
+       case DEC_STATE_DRAIN:
+       case DEC_STATE_STOPPED:
+               ret = hfi_session_flush(inst, HFI_FLUSH_ALL);
+               inst->codec_state = DEC_STATE_SEEK;
+               break;
+       case DEC_STATE_INIT:
+       case DEC_STATE_CAPTURE_SETUP:
+               ret = hfi_session_flush(inst, HFI_FLUSH_INPUT);
+               break;
+       default:
+               break;
+       }
+
+       return ret;
+}
+
+static void vdec_stop_streaming(struct vb2_queue *q)
+{
+       struct venus_inst *inst = vb2_get_drv_priv(q);
+       int ret = -EINVAL;
+
+       mutex_lock(&inst->lock);
+
+       if (IS_CAP(q, inst))
+               ret = vdec_stop_capture(inst);
+       else if (IS_OUT(q, inst))
+               ret = vdec_stop_output(inst);
+
+       venus_helper_buffers_done(inst, VB2_BUF_STATE_ERROR);
+
+       if (ret)
+               goto unlock;
+
        if (q->type == V4L2_BUF_TYPE_VIDEO_OUTPUT_MPLANE)
                inst->streamon_out = 0;
        else
                inst->streamon_cap = 0;
+
+unlock:
        mutex_unlock(&inst->lock);
-       return ret;
+}
+
+static void vdec_session_release(struct venus_inst *inst)
+{
+       struct venus_core *core = inst->core;
+       int ret, abort = 0;
+
+       mutex_lock(&inst->lock);
+
+       inst->codec_state = DEC_STATE_UNINIT;
+
+       ret = hfi_session_stop(inst);
+       abort = (ret && ret != -EINVAL) ? 1 : 0;
+       ret = hfi_session_unload_res(inst);
+       abort = (ret && ret != -EINVAL) ? 1 : 0;
+       ret = venus_helper_unregister_bufs(inst);
+       abort = (ret && ret != -EINVAL) ? 1 : 0;
+       ret = venus_helper_intbufs_free(inst);
+       abort = (ret && ret != -EINVAL) ? 1 : 0;
+       ret = hfi_session_deinit(inst);
+       abort = (ret && ret != -EINVAL) ? 1 : 0;
+
+       if (inst->session_error || core->sys_error)
+               abort = 1;
+
+       if (abort)
+               hfi_session_abort(inst);
+
+       venus_helper_free_dpb_bufs(inst);
+       venus_helper_load_scale_clocks(core);
+       INIT_LIST_HEAD(&inst->registeredbufs);
+
+       mutex_unlock(&inst->lock);
+}
+
+static int vdec_buf_init(struct vb2_buffer *vb)
+{
+       struct venus_inst *inst = vb2_get_drv_priv(vb->vb2_queue);
+
+       inst->buf_count++;
+
+       return venus_helper_vb2_buf_init(vb);
+}
+
+static void vdec_buf_cleanup(struct vb2_buffer *vb)
+{
+       struct venus_inst *inst = vb2_get_drv_priv(vb->vb2_queue);
+
+       inst->buf_count--;
+       if (!inst->buf_count)
+               vdec_session_release(inst);
 }
 
 static const struct vb2_ops vdec_vb2_ops = {
        .queue_setup = vdec_queue_setup,
-       .buf_init = venus_helper_vb2_buf_init,
+       .buf_init = vdec_buf_init,
+       .buf_cleanup = vdec_buf_cleanup,
        .buf_prepare = venus_helper_vb2_buf_prepare,
        .start_streaming = vdec_start_streaming,
-       .stop_streaming = venus_helper_vb2_stop_streaming,
+       .stop_streaming = vdec_stop_streaming,
        .buf_queue = venus_helper_vb2_buf_queue,
 };
 
@@ -891,6 +1108,7 @@ static void vdec_buf_done(struct venus_inst *inst, 
unsigned int buf_type,
 
        vbuf->flags = flags;
        vbuf->field = V4L2_FIELD_NONE;
+       vb = &vbuf->vb2_buf;
 
        if (type == V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE) {
                vb = &vbuf->vb2_buf;
@@ -903,6 +1121,9 @@ static void vdec_buf_done(struct venus_inst *inst, 
unsigned int buf_type,
                        const struct v4l2_event ev = { .type = V4L2_EVENT_EOS };
 
                        v4l2_event_queue_fh(&inst->fh, &ev);
+
+                       if (inst->codec_state == DEC_STATE_DRAIN)
+                               inst->codec_state = DEC_STATE_STOPPED;
                }
        } else {
                vbuf->sequence = inst->sequence_out++;
@@ -914,17 +1135,69 @@ static void vdec_buf_done(struct venus_inst *inst, 
unsigned int buf_type,
        if (hfi_flags & HFI_BUFFERFLAG_DATACORRUPT)
                state = VB2_BUF_STATE_ERROR;
 
+       if (hfi_flags & HFI_BUFFERFLAG_DROP_FRAME) {
+               state = VB2_BUF_STATE_ERROR;
+               vb2_set_plane_payload(vb, 0, 0);
+               vb->timestamp = 0;
+       }
+
        v4l2_m2m_buf_done(vbuf, state);
 }
 
+static void vdec_event_change(struct venus_inst *inst,
+                             struct hfi_event_data *ev_data, bool sufficient)
+{
+       static const struct v4l2_event ev = {
+               .type = V4L2_EVENT_SOURCE_CHANGE,
+               .u.src_change.changes = V4L2_EVENT_SRC_CH_RESOLUTION };
+       struct device *dev = inst->core->dev_dec;
+       struct v4l2_format format = {};
+
+       mutex_lock(&inst->lock);
+
+       format.type = V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE;
+       format.fmt.pix_mp.pixelformat = inst->fmt_cap->pixfmt;
+       format.fmt.pix_mp.width = ev_data->width;
+       format.fmt.pix_mp.height = ev_data->height;
+
+       vdec_try_fmt_common(inst, &format);
+
+       inst->width = format.fmt.pix_mp.width;
+       inst->height = format.fmt.pix_mp.height;
+
+       inst->out_width = ev_data->width;
+       inst->out_height = ev_data->height;
+
+       dev_dbg(dev, "event %s sufficient resources (%ux%u)\n",
+               sufficient ? "" : "not", ev_data->width, ev_data->height);
+
+       if (sufficient) {
+               hfi_session_continue(inst);
+       } else {
+               switch (inst->codec_state) {
+               case DEC_STATE_INIT:
+                       inst->codec_state = DEC_STATE_CAPTURE_SETUP;
+                       break;
+               case DEC_STATE_DECODING:
+                       inst->codec_state = DEC_STATE_DRC;
+                       break;
+               default:
+                       break;
+               }
+       }
+
+       inst->reconfig = true;
+       v4l2_event_queue_fh(&inst->fh, &ev);
+       wake_up(&inst->reconf_wait);
+
+       mutex_unlock(&inst->lock);
+}
+
 static void vdec_event_notify(struct venus_inst *inst, u32 event,
                              struct hfi_event_data *data)
 {
        struct venus_core *core = inst->core;
        struct device *dev = core->dev_dec;
-       static const struct v4l2_event ev = {
-               .type = V4L2_EVENT_SOURCE_CHANGE,
-               .u.src_change.changes = V4L2_EVENT_SRC_CH_RESOLUTION };
 
        switch (event) {
        case EVT_SESSION_ERROR:
@@ -934,18 +1207,10 @@ static void vdec_event_notify(struct venus_inst *inst, 
u32 event,
        case EVT_SYS_EVENT_CHANGE:
                switch (data->event_type) {
                case HFI_EVENT_DATA_SEQUENCE_CHANGED_SUFFICIENT_BUF_RESOURCES:
-                       hfi_session_continue(inst);
-                       dev_dbg(dev, "event sufficient resources\n");
+                       vdec_event_change(inst, data, true);
                        break;
                case HFI_EVENT_DATA_SEQUENCE_CHANGED_INSUFFICIENT_BUF_RESOURCES:
-                       inst->reconfig_height = data->height;
-                       inst->reconfig_width = data->width;
-                       inst->reconfig = true;
-
-                       v4l2_event_queue_fh(&inst->fh, &ev);
-
-                       dev_dbg(dev, "event not sufficient resources (%ux%u)\n",
-                               data->width, data->height);
+                       vdec_event_change(inst, data, false);
                        break;
                case HFI_EVENT_RELEASE_BUFFER_REFERENCE:
                        venus_helper_release_buf_ref(inst, data->tag);
@@ -978,8 +1243,12 @@ static void vdec_inst_init(struct venus_inst *inst)
        inst->hfi_codec = HFI_VIDEO_CODEC_H264;
 }
 
+static void vdec_m2m_device_run(void *priv)
+{
+}
+
 static const struct v4l2_m2m_ops vdec_m2m_ops = {
-       .device_run = venus_helper_m2m_device_run,
+       .device_run = vdec_m2m_device_run,
        .job_abort = venus_helper_m2m_job_abort,
 };
 
@@ -1041,7 +1310,9 @@ static int vdec_open(struct file *file)
        inst->core = core;
        inst->session_type = VIDC_SESSION_TYPE_DEC;
        inst->num_output_bufs = 1;
-
+       inst->codec_state = DEC_STATE_UNINIT;
+       inst->buf_count = 0;
+       init_waitqueue_head(&inst->reconf_wait);
        venus_helper_init_instance(inst);
 
        ret = pm_runtime_get_sync(core->dev_dec);
-- 
2.17.1

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