To implement host side buffer R/W pointer check, we need add buffer update procedures at first, here we introduce host_avail and host_free to indicate the buffer usuage status.
Signed-off-by: Keyon Jie yang.jie@linux.intel.com --- src/audio/host.c | 29 +++++++++++++++++++++++++++++ 1 file changed, 29 insertions(+)
diff --git a/src/audio/host.c b/src/audio/host.c index 48efa4f..3aba934 100644 --- a/src/audio/host.c +++ b/src/audio/host.c @@ -73,6 +73,9 @@ struct host_data { uint32_t host_pos_blks; /* position in bytes (nearest block) */ uint32_t host_period_bytes; /* host period size in bytes */ uint32_t host_period_pos; /* position in current host perid */ + uint32_t host_app_pos; /* host buffer app write pos, points to mailbox */ + uint32_t host_avail; /* host buffer available size */ + uint32_t host_free; /* host buffer free size */ /* pointers set during params to host or local above */ struct hc_buf *source; struct hc_buf *sink; @@ -84,6 +87,30 @@ struct host_data { struct comp_position cp; };
+static inline void host_update_buffer_produce(struct host_data *hd) +{ + if (hd->host_pos_blks < hd->host_app_pos) + hd->host_avail = hd->host_app_pos - hd->host_pos_blks; + else if (hd->host_pos_blks == hd->host_app_pos) + hd->host_avail = hd->host_size; /* full */ + else + hd->host_avail = hd->host_size -hd->host_pos_blks + + hd->host_app_pos; + hd->host_free = hd->host_size - hd->host_avail; +} + +static inline void host_update_buffer_consume(struct host_data *hd) +{ + if (hd->host_pos_blks < hd->host_app_pos) + hd->host_avail = hd->host_app_pos - hd->host_pos_blks; + else if (hd->host_pos_blks == hd->host_app_pos) + hd->host_avail = 0; /* empty */ + else + hd->host_avail = hd->host_size -hd->host_pos_blks + + hd->host_app_pos; + hd->host_free = hd->host_size - hd->host_avail; +} + static inline struct dma_sg_elem *next_buffer(struct hc_buf *hc) { struct dma_sg_elem *elem; @@ -141,6 +168,7 @@ static void host_dma_cb_playback(struct comp_dev *dev, hd->host_pos_blks = 0; if (hd->host_pos) *hd->host_pos = hd->host_pos_blks; + host_update_buffer_consume(hd);
/* send IPC message to driver if needed */ hd->host_period_pos += local_elem->size; @@ -541,6 +569,7 @@ static int host_prepare(struct comp_dev *dev) if (hd->params.direction == STREAM_DIRECTION_PLAYBACK) host_preload(dev);
+ host_update_buffer_consume(hd); dev->state = COMP_STATE_PREPARE; return 0; }