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Bluetooth: hci_bcm: Fix RTS handling during startup

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The RPi 4 uses the hardware handshake lines for CYW43455, but the chip
doesn't react to HCI requests during DT probe. The reason is the inproper
handling of the RTS line during startup. According to the startup
signaling sequence in the CYW43455 datasheet, the hosts RTS line must
be driven after BT_REG_ON and BT_HOST_WAKE.

Signed-off-by: Stefan Wahren <wahrenst@gmx.net>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
This commit is contained in:
Stefan Wahren 2019-10-06 17:28:19 +02:00 committed by Marcel Holtmann
parent bba79fee7a
commit 3347a80965
1 changed files with 2 additions and 0 deletions
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2
drivers/bluetooth/hci_bcm.c
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@ -445,9 +445,11 @@ static int bcm_open(struct hci_uart *hu)
out:
if (bcm->dev) {
hci_uart_set_flow_control(hu, true);
hu->init_speed = bcm->dev->init_speed;
hu->oper_speed = bcm->dev->oper_speed;
err = bcm_gpio_set_power(bcm->dev, true);
hci_uart_set_flow_control(hu, false);
if (err)
goto err_unset_hu;
}