linux-kernel - [PATCH 5.17 0447/1126] Bluetooth: mt7921s: fix bus hang with wrong privilege

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Date:   Tue,  5 Apr 2022 09:19:54 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Sean Wang <sean.wang@...iatek.com>,
        Mark Chen <mark-yw.chen@...iatek.com>,
        Marcel Holtmann <marcel@...tmann.org>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 5.17 0447/1126] Bluetooth: mt7921s: fix bus hang with wrong privilege

From: Mark Chen <mark-yw.chen@...iatek.com>

[ Upstream commit 752aea58489fd42f5c54dc50cb098d19e486ae61 ]

According to chip hw flow, mt7921s need to re-acquire privilege
again before normal running. Otherwise, the bus may be stuck in
an abnormal status.

Fixes: c603bf1f94d0 ("Bluetooth: btmtksdio: add MT7921s Bluetooth support")
Co-developed-by: Sean Wang <sean.wang@...iatek.com>
Signed-off-by: Sean Wang <sean.wang@...iatek.com>
Signed-off-by: Mark Chen <mark-yw.chen@...iatek.com>
Signed-off-by: Marcel Holtmann <marcel@...tmann.org>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/bluetooth/btmtksdio.c | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/drivers/bluetooth/btmtksdio.c b/drivers/bluetooth/btmtksdio.c
index d4e2541a4873..c05578b52d33 100644
--- a/drivers/bluetooth/btmtksdio.c
+++ b/drivers/bluetooth/btmtksdio.c
@@ -872,6 +872,15 @@ static int btmtksdio_setup(struct hci_dev *hdev)
 		err = mt79xx_setup(hdev, fwname);
 		if (err < 0)
 			return err;
+
+		err = btmtksdio_fw_pmctrl(bdev);
+		if (err < 0)
+			return err;
+
+		err = btmtksdio_drv_pmctrl(bdev);
+		if (err < 0)
+			return err;
+
 		break;
 	case 0x7663:
 	case 0x7668:
-- 
2.34.1