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Commit 78b3684e authored by Weifan's avatar Weifan Committed by Edward Wang
Browse files

BT: Add Low latency flow for Mediatek BT Chip 

Description:
Use VSC to set link priority for Mediatek chip

Bug: 309700239
Test: m .
Flag: EXEMPT VSC command

Change-Id: Iccbb40416f938cffd2fdffa6452f994cfb99507d
parent dcd1cd7e

system/stack/include/hcidefs.h

+9 −0
Original line number Diff line number Diff line
@@ -916,6 +916,9 @@ typedef struct { 
// TODO Remove this once all UNISOC specific hacks are removed.

#define LMP_COMPID_UNISOC 0x073F



// TODO Remove this once all Mediatek specific hacks are removed.

#define LMP_COMPID_MEDIATEK 0x0046



/* Parameter information for HCI_SYNA_SET_ACL_PRIORITY */

#define HCI_SYNA_ACL_PRIORITY_PARAM_SIZE 3

#define HCI_SYNA_ACL_NORMAL_PRIORITY 0xF0
@@ -929,6 +932,12 @@ typedef struct { 
#define HCI_UNISOC_ACL_NORMAL_PRIORITY 0x00

#define HCI_UNISOC_ACL_HIGH_PRIORITY 0xFF



/* Parameter information for HCI_MTK_SET_ACL_PRIORITY */

#define HCI_MTK_ACL_PRIORITY_PARAM_SIZE 1

#define HCI_MTK_SET_ACL_PRIORITY (0xFD95 | HCI_GRP_VENDOR_SPECIFIC)

#define HCI_MTK_ACL_NORMAL_PRIORITY 0x00

#define HCI_MTK_ACL_HIGH_PRIORITY 0x01



/*

 * Define packet size

*/

system/stack/l2cap/l2c_utils.cc

+32 −0
Original line number Diff line number Diff line
@@ -2335,6 +2335,34 @@ static void l2cu_set_acl_priority_unisoc(tL2C_LCB* p_lcb, 
                            HCI_UNISOC_ACL_PRIORITY_PARAM_SIZE, command, NULL);

}



/*******************************************************************************

 *

 * Function         l2cu_set_acl_priority_latency_mtk

 *

 * Description      Sends a VSC to set the ACL priority and recorded latency on

 *                  Mediatek chip.

 *

 * Returns          void

 *

 ******************************************************************************/



static void l2cu_set_acl_priority_latency_mtk(tL2C_LCB* p_lcb,

                                               tL2CAP_PRIORITY priority) {

  uint8_t vs_param;

  if (priority == L2CAP_PRIORITY_HIGH) {

    // priority to high, if using latency mode check preset latency

    LOG_INFO("Set ACL priority: High Priority Mode");

    vs_param = HCI_MTK_ACL_HIGH_PRIORITY;

  } else {

    // priority to normal

    LOG_INFO("Set ACL priority: Normal Mode");

    vs_param = HCI_MTK_ACL_NORMAL_PRIORITY;

  }



  BTM_VendorSpecificCommand(HCI_MTK_SET_ACL_PRIORITY,

                            HCI_MTK_ACL_PRIORITY_PARAM_SIZE, &vs_param, NULL);

}



/*******************************************************************************

 *

 * Function         l2cu_set_acl_priority
@@ -2379,6 +2407,10 @@ bool l2cu_set_acl_priority(const RawAddress& bd_addr, tL2CAP_PRIORITY priority, 
        l2cu_set_acl_priority_unisoc(p_lcb, priority);

        break;



      case LMP_COMPID_MEDIATEK:

        l2cu_set_acl_priority_latency_mtk(p_lcb, priority);

        break;



      default:

        /* Not supported/required for other vendors */

        break;