linux-kernel - [PATCH 2/3] Bluetooth: btusb: Trigger gpio reset quicker

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Date:   Tue, 19 Jan 2021 12:43:13 -0800
From:   Abhishek Pandit-Subedi <abhishekpandit@...omium.org>
To:     marcel@...tmann.org
Cc:     chromeos-bluetooth-upstreaming@...omium.org, mcchou@...omium.org,
        michaelfsun@...gle.com, linux-bluetooth@...r.kernel.org,
        apusaka@...omium.org,
        Abhishek Pandit-Subedi <abhishekpandit@...omium.org>,
        Daniel Winkler <danielwinkler@...gle.com>,
        Johan Hedberg <johan.hedberg@...il.com>,
        Luiz Augusto von Dentz <luiz.dentz@...il.com>,
        linux-kernel@...r.kernel.org
Subject: [PATCH 2/3] Bluetooth: btusb: Trigger gpio reset quicker

Currently, btusb will only trigger gpio reset during cmd_timeout after
5 commands fail. This number is arbitrarily large and can result in
resets taking longer to occur than necessary.

Reduce this number to 3, which was chosen as a recommended value by
Intel (their firmware allow two commands in flight so they recommend
resetting on the third failed command).

Signed-off-by: Abhishek Pandit-Subedi <abhishekpandit@...omium.org>
Reviewed-by: Miao-chen Chou <mcchou@...omium.org>
Reviewed-by: Daniel Winkler <danielwinkler@...gle.com>
---

 drivers/bluetooth/btusb.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/bluetooth/btusb.c b/drivers/bluetooth/btusb.c
index 03341e6cbf3ed..880e9cd4ee713 100644
--- a/drivers/bluetooth/btusb.c
+++ b/drivers/bluetooth/btusb.c
@@ -578,7 +578,7 @@ static void btusb_gpio_cmd_timeout(struct hci_dev *hdev)
 {
 	struct btusb_data *data = hci_get_drvdata(hdev);
 
-	if (++data->cmd_timeout_cnt < 5)
+	if (++data->cmd_timeout_cnt < 3)
 		return;
 
 	if (!data->reset_gpio) {
-- 
2.30.0.284.gd98b1dd5eaa7-goog