From 8807148678f136ad66f64c8ee5099a1f81fa5a72 Mon Sep 17 00:00:00 2001 From: Stefan Wahren Date: Sun, 6 Oct 2019 17:28:19 +0200 Subject: [PATCH] Bluetooth: hci_bcm: Fix RTS handling during startup commit 3347a80965b38f096b1d6f995c00c9c9e53d4b8b upstream. 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 Signed-off-by: Marcel Holtmann --- drivers/bluetooth/hci_bcm.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/drivers/bluetooth/hci_bcm.c b/drivers/bluetooth/hci_bcm.c index 94ed734..f204ae6 100644 --- a/drivers/bluetooth/hci_bcm.c +++ b/drivers/bluetooth/hci_bcm.c @@ -448,9 +448,11 @@ 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; } -- 2.7.4