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authorStefan Wahren <wahrenst@gmx.net>2019-10-06 17:28:19 +0200
committerMarcel Holtmann <marcel@holtmann.org>2019-10-21 17:05:14 +0200
commit3347a80965b38f096b1d6f995c00c9c9e53d4b8b (patch)
tree9f65520a39317e5df0a9194f7f3365c07843ef8a /drivers/bluetooth/hci_bcm.c
parentbba79fee7a54ff5351fa36cb324d16b108a7ca06 (diff)
downloadlinux-3347a80965b38f096b1d6f995c00c9c9e53d4b8b.tar.bz2
Bluetooth: hci_bcm: Fix RTS handling during startup
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>
Diffstat (limited to 'drivers/bluetooth/hci_bcm.c')
-rw-r--r--drivers/bluetooth/hci_bcm.c2
1 files changed, 2 insertions, 0 deletions
diff --git a/drivers/bluetooth/hci_bcm.c b/drivers/bluetooth/hci_bcm.c
index 7646636f2d18..0f73f6a686cb 100644
--- a/drivers/bluetooth/hci_bcm.c
+++ b/drivers/bluetooth/hci_bcm.c
@@ -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;
}