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Subject[PATCH 4/5] staging: ozwpan: isoc latency for audio burst
Date
Set audio latency. This fixes issue where audio clips heard during
link outage.

Signed-off-by: Rupesh Gujare <rgujare@ozmodevices.com>
---
drivers/staging/ozwpan/ozpd.c | 8 +-------
drivers/staging/ozwpan/ozpd.h | 1 +
drivers/staging/ozwpan/ozproto.c | 13 +++++++++++++
drivers/staging/ozwpan/ozproto.h | 6 ++++++
drivers/staging/ozwpan/ozprotocol.h | 6 +++++-
5 files changed, 26 insertions(+), 8 deletions(-)
diff --git a/drivers/staging/ozwpan/ozpd.c b/drivers/staging/ozwpan/ozpd.c
index 6c287ac..f546b5a 100644
--- a/drivers/staging/ozwpan/ozpd.c
+++ b/drivers/staging/ozwpan/ozpd.c
@@ -24,12 +24,6 @@
/*------------------------------------------------------------------------------
*/
#define OZ_MAX_TX_POOL_SIZE 6
-/* Maximum number of uncompleted isoc frames that can be pending in network.
- */
-#define OZ_MAX_SUBMITTED_ISOC 16
-/* Maximum number of uncompleted isoc frames that can be pending in Tx Queue.
- */
-#define OZ_MAX_TX_QUEUE_ISOC 32
/*------------------------------------------------------------------------------
*/
static struct oz_tx_frame *oz_tx_frame_alloc(struct oz_pd *pd);
@@ -854,7 +848,7 @@ int oz_send_isoc_unit(struct oz_pd *pd, u8 ep_num, u8 *data, int len)
if (!(pd->mode & OZ_F_ISOC_ANYTIME)) {
struct oz_tx_frame *isoc_unit = NULL;
int nb = pd->nb_queued_isoc_frames;
- if (nb >= OZ_MAX_TX_QUEUE_ISOC) {
+ if (nb >= pd->isoc_latency) {
oz_trace2(OZ_TRACE_TX_FRAMES,
"Dropping ISOC Unit nb= %d\n",
nb);
diff --git a/drivers/staging/ozwpan/ozpd.h b/drivers/staging/ozwpan/ozpd.h
index ddf1341..d35b0ea 100644
--- a/drivers/staging/ozwpan/ozpd.h
+++ b/drivers/staging/ozwpan/ozpd.h
@@ -82,6 +82,7 @@ struct oz_pd {
u8 heartbeat_requested;
u8 mode;
u8 ms_per_isoc;
+ unsigned isoc_latency;
unsigned max_stream_buffering;
int nb_queued_frames;
int nb_queued_isoc_frames;
diff --git a/drivers/staging/ozwpan/ozproto.c b/drivers/staging/ozwpan/ozproto.c
index a50ab18..cfb5160 100644
--- a/drivers/staging/ozwpan/ozproto.c
+++ b/drivers/staging/ozwpan/ozproto.c
@@ -220,6 +220,19 @@ static struct oz_pd *oz_connect_req(struct oz_pd *cur_pd, struct oz_elt *elt,
pd->ms_per_isoc = body->ms_per_isoc;
if (!pd->ms_per_isoc)
pd->ms_per_isoc = 4;
+
+ switch (body->ms_isoc_latency & OZ_LATENCY_MASK) {
+ case OZ_ONE_MS_LATENCY:
+ pd->isoc_latency = (body->ms_isoc_latency &
+ ~OZ_LATENCY_MASK) / pd->ms_per_isoc;
+ break;
+ case OZ_TEN_MS_LATENCY:
+ pd->isoc_latency = ((body->ms_isoc_latency &
+ ~OZ_LATENCY_MASK) * 10) / pd->ms_per_isoc;
+ break;
+ default:
+ pd->isoc_latency = OZ_MAX_TX_QUEUE_ISOC;
+ }
}
if (body->max_len_div16)
pd->max_tx_size = ((u16)body->max_len_div16)<<4;
diff --git a/drivers/staging/ozwpan/ozproto.h b/drivers/staging/ozwpan/ozproto.h
index 7d5b476..755a08d 100644
--- a/drivers/staging/ozwpan/ozproto.h
+++ b/drivers/staging/ozwpan/ozproto.h
@@ -30,6 +30,12 @@
/* Maximun sizes of tx frames. */
#define OZ_MAX_TX_SIZE 1514

+/* Maximum number of uncompleted isoc frames that can be pending in network. */
+#define OZ_MAX_SUBMITTED_ISOC 16
+
+/* Maximum number of uncompleted isoc frames that can be pending in Tx Queue. */
+#define OZ_MAX_TX_QUEUE_ISOC 32
+
/* Application handler functions.
*/
typedef int (*oz_app_init_fn_t)(void);
diff --git a/drivers/staging/ozwpan/ozprotocol.h b/drivers/staging/ozwpan/ozprotocol.h
index 1e4edbe..17b09b9 100644
--- a/drivers/staging/ozwpan/ozprotocol.h
+++ b/drivers/staging/ozwpan/ozprotocol.h
@@ -65,6 +65,10 @@ struct oz_hdr {

#define OZ_LAST_PN_HALF_CYCLE 127

+#define OZ_LATENCY_MASK 0xc0
+#define OZ_ONE_MS_LATENCY 0x40
+#define OZ_TEN_MS_LATENCY 0x80
+
/* Connect request data structure.
*/
struct oz_elt_connect_req {
@@ -73,7 +77,7 @@ struct oz_elt_connect_req {
u8 pd_info;
u8 session_id;
u8 presleep;
- u8 resv2;
+ u8 ms_isoc_latency;
u8 host_vendor;
u8 keep_alive;
u16 apps;
--
1.7.5.4



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