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34 lines
1.2 KiB
Diff
34 lines
1.2 KiB
Diff
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From 44843cf006346751e42c0f4100eea7cefe61cbdf Mon Sep 17 00:00:00 2001
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From: Stefan Wahren <wahrenst@gmx.net>
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Date: Sun, 6 Oct 2019 17:28:19 +0200
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Subject: [PATCH] Bluetooth: hci_bcm: Fix RTS handling during startup
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commit 3347a80965b38f096b1d6f995c00c9c9e53d4b8b upstream.
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The RPi 4 uses the hardware handshake lines for CYW43455, but the chip
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doesn't react to HCI requests during DT probe. The reason is the inproper
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handling of the RTS line during startup. According to the startup
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signaling sequence in the CYW43455 datasheet, the hosts RTS line must
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be driven after BT_REG_ON and BT_HOST_WAKE.
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Signed-off-by: Stefan Wahren <wahrenst@gmx.net>
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Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
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---
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drivers/bluetooth/hci_bcm.c | 2 ++
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1 file changed, 2 insertions(+)
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--- a/drivers/bluetooth/hci_bcm.c
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+++ b/drivers/bluetooth/hci_bcm.c
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@@ -448,9 +448,11 @@ static int bcm_open(struct hci_uart *hu)
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out:
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if (bcm->dev) {
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+ hci_uart_set_flow_control(hu, true);
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hu->init_speed = bcm->dev->init_speed;
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hu->oper_speed = bcm->dev->oper_speed;
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err = bcm_gpio_set_power(bcm->dev, true);
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+ hci_uart_set_flow_control(hu, false);
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if (err)
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goto err_unset_hu;
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}
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