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Commit c390216b3e868b16d8154939f4b6f8c16dbd9a9f

Authored by Nick Pelly
Committed by Marcel Holtmann
1 parent 88d1a0cf65
Exists in master and in 7 other branches imx_3.0.35_4.1.0, imx_3.10.17_1.0.1_ga, imx_3.10.53_1.1.0_ga, imx_3.14.28_1.0.0_ga, smarc-imx_3.10.53_1.1.0_ga, smarc-imx_3.14.28_1.0.0_ga, smarc-l5.0.0_1.0.0-ga

Bluetooth: Enter active mode before establishing a SCO link. 

When in sniff mode with a long interval time (1.28s) it can take 4+ seconds
to establish a SCO link. Fix by requesting active mode before requesting
SCO connection. This improves SCO setup time to ~500ms.

Bluetooth headsets that use a long interval time, and exhibit the long
SCO connection time include Motorola H790, HX1 and H17. They have a
CSR 2.1 chipset.

Verified this behavior and fix with host Bluetooth chipsets: BCM4329 and
TI1271.

2009-10-13 14:17:46.183722 > HCI Event: Mode Change (0x14) plen 6
    status 0x00 handle 1 mode 0x02 interval 2048
    Mode: Sniff
2009-10-13 14:17:53.436285 < HCI Command: Setup Synchronous Connection (0x01|0x0028) plen 17
    handle 1 voice setting 0x0060
2009-10-13 14:17:53.445593 > HCI Event: Command Status (0x0f) plen 4
    Setup Synchronous Connection (0x01|0x0028) status 0x00 ncmd 1
2009-10-13 14:17:57.788855 > HCI Event: Synchronous Connect Complete 0x2c) plen 17
    status 0x00 handle 257 bdaddr 00:1A:0E:F1:A4:7F type eSCO
    Air mode: CVSD

Signed-off-by: Nick Pelly <npelly@google.com>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>

Showing 1 changed file with 3 additions and 0 deletions Side-by-side Diff

net/bluetooth/hci_conn.c
Diff comments   View file @ c390216
... ... @@ -377,6 +377,9 @@
377 377  
378 378 if (acl->state == BT_CONNECTED &&
379 379 (sco->state == BT_OPEN || sco->state == BT_CLOSED)) {
  380 + acl->power_save = 1;
  381 + hci_conn_enter_active_mode(acl);
  382 +
380 383 if (lmp_esco_capable(hdev))
381 384 hci_setup_sync(sco, acl->handle);
382 385 else