linux-kernel - [PATCH v3 2/2] Bluetooth: hci_h5: Add flag for keep power during suspend/resume

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Date:   Fri, 23 Apr 2021 11:52:29 +0800
From:   <hildawu@...ltek.com>
To:     <marcel@...tmann.org>
CC:     <johan.hedberg@...il.com>, <luiz.dentz@...il.com>,
        <linux-bluetooth@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <apusaka@...omium.org>, <tientzu@...omium.org>,
        <max.chou@...ltek.com>, <alex_lu@...lsil.com.cn>,
        <kidman@...ltek.com>
Subject: [PATCH v3 2/2] Bluetooth: hci_h5: Add flag for keep power during suspend/resume

From: hildawu <hildawu@...ltek.com>

RTL8822C and RTL8852A devices support BT wakeup Host. Add a flag
for these specific devices did not power off during suspend and resume.
By this change, if the Host support that received BT device signal then
it can wake Host up.

Signed-off-by: hildawu <hildawu@...ltek.com>
---
Changed in v3:
- Reworked to use UART flag, refer to Maintainer's suggestion.
- Split into two patches for different purpose.

Changes in v2:
- Add the missing struct member
- Modify title length
---
---
 drivers/bluetooth/hci_h5.c    | 34 ++++++++++++++++++++++++----------
 drivers/bluetooth/hci_ldisc.c |  3 ++-
 drivers/bluetooth/hci_uart.h  |  1 +
 3 files changed, 27 insertions(+), 11 deletions(-)

diff --git a/drivers/bluetooth/hci_h5.c b/drivers/bluetooth/hci_h5.c
index 27e96681d583..9cacc4cdc928 100644
--- a/drivers/bluetooth/hci_h5.c
+++ b/drivers/bluetooth/hci_h5.c
@@ -911,6 +911,15 @@ static int h5_btrtl_setup(struct h5 *h5)
 	 */
 	set_bit(HCI_QUIRK_SIMULTANEOUS_DISCOVERY, &h5->hu->hdev->quirks);
 
+	switch (btrtl_dev->project_id) {
+	case CHIP_ID_8822C:
+	case CHIP_ID_8852A:
+		set_bit(HCI_UART_WAKEUP_ENABLE, &h5->hu->hdev_flags);
+		break;
+	default:
+		break;
+	}
+
 out_free:
 	btrtl_free(btrtl_dev);
 
@@ -945,8 +954,11 @@ static void h5_btrtl_close(struct h5 *h5)
 static int h5_btrtl_suspend(struct h5 *h5)
 {
 	serdev_device_set_flow_control(h5->hu->serdev, false);
-	gpiod_set_value_cansleep(h5->device_wake_gpio, 0);
-	gpiod_set_value_cansleep(h5->enable_gpio, 0);
+
+	if (!test_bit(HCI_UART_WAKEUP_ENABLE, &h5->hu->hdev_flags)) {
+		gpiod_set_value_cansleep(h5->device_wake_gpio, 0);
+		gpiod_set_value_cansleep(h5->enable_gpio, 0);
+	}
 	return 0;
 }
 
@@ -972,17 +984,19 @@ static void h5_btrtl_reprobe_worker(struct work_struct *work)
 
 static int h5_btrtl_resume(struct h5 *h5)
 {
-	struct h5_btrtl_reprobe *reprobe;
+	if (!test_bit(HCI_UART_WAKEUP_ENABLE, &h5->hu->hdev_flags)) {
+		struct h5_btrtl_reprobe *reprobe;
 
-	reprobe = kzalloc(sizeof(*reprobe), GFP_KERNEL);
-	if (!reprobe)
-		return -ENOMEM;
+		reprobe = kzalloc(sizeof(*reprobe), GFP_KERNEL);
+		if (!reprobe)
+			return -ENOMEM;
 
-	__module_get(THIS_MODULE);
+		__module_get(THIS_MODULE);
 
-	INIT_WORK(&reprobe->work, h5_btrtl_reprobe_worker);
-	reprobe->dev = get_device(&h5->hu->serdev->dev);
-	queue_work(system_long_wq, &reprobe->work);
+		INIT_WORK(&reprobe->work, h5_btrtl_reprobe_worker);
+		reprobe->dev = get_device(&h5->hu->serdev->dev);
+		queue_work(system_long_wq, &reprobe->work);
+	}
 	return 0;
 }
 
diff --git a/drivers/bluetooth/hci_ldisc.c b/drivers/bluetooth/hci_ldisc.c
index 637c5b8c2aa1..3a1038e9dc6a 100644
--- a/drivers/bluetooth/hci_ldisc.c
+++ b/drivers/bluetooth/hci_ldisc.c
@@ -719,7 +719,8 @@ static int hci_uart_set_flags(struct hci_uart *hu, unsigned long flags)
 				    BIT(HCI_UART_CREATE_AMP) |
 				    BIT(HCI_UART_INIT_PENDING) |
 				    BIT(HCI_UART_EXT_CONFIG) |
-				    BIT(HCI_UART_VND_DETECT);
+				    BIT(HCI_UART_VND_DETECT) |
+				    BIT(HCI_UART_WAKEUP_ENABLE);
 
 	if (flags & ~valid_flags)
 		return -EINVAL;
diff --git a/drivers/bluetooth/hci_uart.h b/drivers/bluetooth/hci_uart.h
index 4e039d7a16f8..25f5e5c7544c 100644
--- a/drivers/bluetooth/hci_uart.h
+++ b/drivers/bluetooth/hci_uart.h
@@ -41,6 +41,7 @@
 #define HCI_UART_INIT_PENDING	3
 #define HCI_UART_EXT_CONFIG	4
 #define HCI_UART_VND_DETECT	5
+#define HCI_UART_WAKEUP_ENABLE	6
 
 struct hci_uart;
 struct serdev_device;
-- 
2.17.1