6f7adf9636
The BT host has fixed set of buffers to send data to SoC, generic value is 5. When a connection, like A2DP playback is ready to send data it fills one of the buffer available and sends to SoC. Once SoC got acknowledged from remote side that the data received it updates the host and the buffer is freed. Till host is acknowledged the send Complete info, the data buffer is locked for that data transfer. The below is the example for buffers availability. Total free Buffers count : 5 Connections : 1 Conn_1 need to send data, picks buf_1 and send to SoC free Buffers count: 4 Buffers used by Conn_1 : 1 Still Conn_1 has more data to send .... free Buffers count: 3 Buffers used by Conn_1 : 2 Remote device Ack for buf_1, so 1 buffer is freed, updated state is free Buffers count : 4 Buffers used by Conn_1 : 1 When there are more ACL connections to transfer data, like one connection for A2DP playback and one for OPP data transfer, all the data buffers available with host can be used by any ACL which has ready data to send. This allows maximum throughputs possibility from host. But the existing solution has a problem. If one connection has used all the buffers at a instanace of time, and didnt release (this happens when remote device doesnt ACK to send) the other connections will not have buffers to send. In current usecase A2dp data cannot be sent to headset as OPP connection is lost. The current change is, when there are more connections the quota for a connection that it can use maximum is total buffers-1. This allows other connections not to get blocked, at the same time through puts are not going to dropped. CRs-Fixed: 370497 Change-Id: Iac34f0a223555de80d1daebde34c7fc87668c0d5 Signed-off-by: Srinivas Krovvidi <skrovvid@codeaurora.org>