linux-kernel - [PATCH v3 4/5] Bluetooth: btusb: mediatek: reset the controller before downloading the fw

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [day] [month] [year] [list]

Message-Id: <13854f7ce7d4607d37dc24f39c69b3fe6d6e44f3.1714082459.git.sean.wang@kernel.org>
Date: Thu, 25 Apr 2024 15:06:30 -0700
From: sean.wang@...nel.org
To: marcel@...tmann.org,
	johan.hedberg@...il.com,
	luiz.dentz@...il.com
Cc: linux-bluetooth@...r.kernel.org,
	linux-mediatek@...ts.infradead.org,
	linux-kernel@...r.kernel.org,
	Hao Qin <hao.qin@...iatek.com>,
	Sean Wang <sean.wang@...iatek.com>,
	Chris Lu <chris.lu@...iatek.com>
Subject: [PATCH v3 4/5] Bluetooth: btusb: mediatek: reset the controller before downloading the fw

From: Hao Qin <hao.qin@...iatek.com>

Reset the controller before downloading the firmware to improve its
reliability. This includes situations like cold or warm reboots, ensuring
the controller is in its initial state before starting the firmware
download.

Co-developed-by: Sean Wang <sean.wang@...iatek.com>
Signed-off-by: Sean Wang <sean.wang@...iatek.com>
Co-developed-by: Chris Lu <chris.lu@...iatek.com>
Signed-off-by: Chris Lu <chris.lu@...iatek.com>
Signed-off-by: Hao Qin <hao.qin@...iatek.com>
---
v3: split from the v2 to make the patch do one thing in a patch and ensure
    the reset the controller only when we actually need it to avoid the
    regression on the time spent in opening the controller.
---
 drivers/bluetooth/btusb.c | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/drivers/bluetooth/btusb.c b/drivers/bluetooth/btusb.c
index a25543ff6472..6cfeec2118e9 100644
--- a/drivers/bluetooth/btusb.c
+++ b/drivers/bluetooth/btusb.c
@@ -3132,6 +3132,13 @@ static int btusb_mtk_setup(struct hci_dev *hdev)
 	case 0x7922:
 	case 0x7961:
 	case 0x7925:
+		/* Reset the device to ensure it's in the initial state before
+		 * downloading the firmware to ensure.
+		 */
+
+		if (!test_bit(BTUSB_FIRMWARE_LOADED, &data->flags))
+			btusb_mtk_subsys_reset(hdev, dev_id);
+
 		btmtk_fw_get_filename(fw_bin_name, sizeof(fw_bin_name), dev_id,
 				      fw_version);
 
@@ -3139,9 +3146,12 @@ static int btusb_mtk_setup(struct hci_dev *hdev)
 						btusb_mtk_hci_wmt_sync);
 		if (err < 0) {
 			bt_dev_err(hdev, "Failed to set up firmware (%d)", err);
+			clear_bit(BTUSB_FIRMWARE_LOADED, &data->flags);
 			return err;
 		}
 
+		set_bit(BTUSB_FIRMWARE_LOADED, &data->flags);
+
 		/* It's Device EndPoint Reset Option Register */
 		btusb_mtk_uhw_reg_write(data, MTK_EP_RST_OPT, MTK_EP_RST_IN_OUT_OPT);
 
-- 
2.25.1