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Bluetooth: hci_ll: Sleep while waiting for the controller to power up

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ll_setup() busy-waits for 100 ms after asserting the controller enable
GPIO on each firmware download attempt. With retries this can occupy
the CPU for up to 400 ms.

The setup callback runs in sleepable context and already uses msleep(),
gpiod_set_value_cansleep() and synchronous firmware commands. Replace
mdelay(100) with msleep(100) so the CPU can run other work during the
power-up delay. Keep the requested delay and subsequent CTS wait.

Signed-off-by: Xuhua Zhang <zhangxuhua@kylinsec.com.cn>
Signed-off-by: Luiz Augusto von Dentz <luiz.von.dentz@intel.com>
This commit is contained in:
Xuhua Zhang 2026-09-07 23:12:45 +08:00 committed by Luiz Augusto von Dentz
parent c84f9fc657
commit 09cf09f752
1 changed files with 1 additions and 1 deletions
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2
drivers/bluetooth/hci_ll.c
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@ -629,7 +629,7 @@ static int ll_setup(struct hci_uart *hu)
gpiod_set_value_cansleep(lldev->enable_gpio, 0);
msleep(5);
gpiod_set_value_cansleep(lldev->enable_gpio, 1);
mdelay(100);
msleep(100);
err = serdev_device_wait_for_cts(serdev, true, 200);
if (err) {
bt_dev_err(hu->hdev, "Failed to get CTS");