linux-kernel - [PATCH 3/7] Bluetooth: mt7921s: fix bus hang with wrong privilege

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Date:   Wed, 12 Jan 2022 15:39:13 +0800
From:   <sean.wang@...iatek.com>
To:     <marcel@...tmann.org>, <johan.hedberg@...il.com>
CC:     <Mark-YW.Chen@...iatek.com>, <sean.wang@...iatek.com>,
        <Soul.Huang@...iatek.com>, <YN.Chen@...iatek.com>,
        <Leon.Yen@...iatek.com>, <Eric-SY.Chang@...iatek.com>,
        <Deren.Wu@...iatek.com>, <km.lin@...iatek.com>,
        <robin.chiu@...iatek.com>, <Eddie.Chen@...iatek.com>,
        <ch.yeh@...iatek.com>, <posh.sun@...iatek.com>,
        <ted.huang@...iatek.com>, <Eric.Liang@...iatek.com>,
        <Stella.Chang@...iatek.com>, <Tom.Chou@...iatek.com>,
        <steve.lee@...iatek.com>, <jsiuda@...gle.com>,
        <frankgor@...gle.com>, <jemele@...gle.com>,
        <abhishekpandit@...gle.com>, <michaelfsun@...gle.com>,
        <mcchou@...omium.org>, <shawnku@...gle.com>,
        <linux-bluetooth@...r.kernel.org>,
        <linux-mediatek@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>,
        Mark Chen <mark-yw.chen@...iatek.com>
Subject: [PATCH 3/7] Bluetooth: mt7921s: fix bus hang with wrong privilege

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

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>
---
 drivers/bluetooth/btmtksdio.c | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/drivers/bluetooth/btmtksdio.c b/drivers/bluetooth/btmtksdio.c
index 8cbd49013d86..0951bb10d117 100644
--- a/drivers/bluetooth/btmtksdio.c
+++ b/drivers/bluetooth/btmtksdio.c
@@ -960,6 +960,14 @@ static int btmtksdio_setup(struct hci_dev *hdev)
 		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;
+
 		/* Enable SCO over I2S/PCM */
 		err = btmtksdio_sco_setting(hdev);
 		if (err < 0) {
-- 
2.25.1