From: Zijun Hu <quic_zijuhu@xxxxxxxxxxx> WCN6855 2.1 will reset to apply firmware downloaded, so wait a moment for reset done then go ahead to improve stability. Signed-off-by: Zijun Hu <quic_zijuhu@xxxxxxxxxxx> --- drivers/bluetooth/btusb.c | 8 ++++++++ 1 file changed, 8 insertions(+) diff --git a/drivers/bluetooth/btusb.c b/drivers/bluetooth/btusb.c index ef5d52f0e123..9e0d59d4382a 100644 --- a/drivers/bluetooth/btusb.c +++ b/drivers/bluetooth/btusb.c @@ -2999,6 +2999,7 @@ static int btusb_set_bdaddr_wcn6855(struct hci_dev *hdev, #define QCA_PATCH_UPDATED 0x80 #define QCA_DFU_TIMEOUT 3000 #define QCA_FLAG_MULTI_NVM 0x80 +#define QCA_BT_RESET_WAIT_MS 100 #define WCN6855_2_0_RAM_VERSION_GF 0x400c1200 #define WCN6855_2_1_RAM_VERSION_GF 0x400c1211 @@ -3325,6 +3326,13 @@ static int btusb_setup_qca(struct hci_dev *hdev) err = btusb_setup_qca_load_nvm(hdev, &ver, info); if (err < 0) return err; + + /* WCN6855 2.1 will reset to apply firmware downloaded here, so + * wait ~100ms for reset Done then go ahead, otherwise, it maybe + * cause potential enable failure. + */ + if (info->rom_version == 0x00130201) + msleep(QCA_BT_RESET_WAIT_MS); } return 0; -- The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum, a Linux Foundation Collaborative Project
