linux-kernel - [PATCH v3] Bluetooth: btusb: Remove WAKEUP_DISABLE and add WAKEUP

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Message-ID: <20210817030312.27755-1-max.chou@realtek.com>
Date:   Tue, 17 Aug 2021 11:03:12 +0800
From:   <max.chou@...ltek.com>
To:     <marcel@...tmann.org>, <johan.hedberg@...il.com>,
        <luiz.dentz@...il.com>, <matthias.bgg@...il.com>,
        <linux-bluetooth@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-mediatek@...ts.infradead.org>
CC:     <alex_lu@...lsil.com.cn>, <hildawu@...ltek.com>,
        <kidman@...ltek.com>, <apusaka@...omium.org>,
        <abhishekpandit@...omium.org>, <josephsih@...omium.org>,
        <max.chou@...ltek.com>
Subject: [PATCH v3] Bluetooth: btusb: Remove WAKEUP_DISABLE and add  WAKEUP_AUTOSUSPEND for Realtek devices

From: Max Chou <max.chou@...ltek.com>

For the commit of 9e45524a011107a73bc2cdde8370c61e82e93a4d, wakeup is
always disabled for Realtek devices. However, there's the capability
for Realtek devices to apply USB wakeup.

In this commit, remove WAKEUP_DISABLE feature for Realtek devices.
If users would switch wakeup, they should access
"/sys/bus/usb/.../power/wakeup"

In this commit, it also adds the feature as WAKEUP_AUTOSUSPEND
for Realtek devices because it should set do_remote_wakeup on autosuspend.

Signed-off-by: Max Chou <max.chou@...ltek.com>
Tested-by: Hilda Wu <hildawu@...ltek.com>
Reviewed-by: Archie Pusaka <apusaka@...omium.org>
Reviewed-by: Abhishek Pandit-Subedi <abhishekpandit@...omium.org>
---
Changes in v2:
-fix the compiling error due to the incorrect patch file submited

Changes in v3:
-do rebase and make the patch on the latest revision
---
 drivers/bluetooth/btusb.c | 28 +++++++++-------------------
 1 file changed, 9 insertions(+), 19 deletions(-)

diff --git a/drivers/bluetooth/btusb.c b/drivers/bluetooth/btusb.c
index 2336f731dbc7..60d2fce59a71 100644
--- a/drivers/bluetooth/btusb.c
+++ b/drivers/bluetooth/btusb.c
@@ -527,7 +527,7 @@ static const struct dmi_system_id btusb_needs_reset_resume_table[] = {
 #define BTUSB_OOB_WAKE_ENABLED	11
 #define BTUSB_HW_RESET_ACTIVE	12
 #define BTUSB_TX_WAIT_VND_EVT	13
-#define BTUSB_WAKEUP_DISABLE	14
+#define BTUSB_WAKEUP_AUTOSUSPEND	14
 #define BTUSB_USE_ALT3_FOR_WBS	15
 
 struct btusb_data {
@@ -1350,13 +1350,6 @@ static int btusb_open(struct hci_dev *hdev)
 
 	data->intf->needs_remote_wakeup = 1;
 
-	/* Disable device remote wakeup when host is suspended
-	 * For Realtek chips, global suspend without
-	 * SET_FEATURE (DEVICE_REMOTE_WAKEUP) can save more power in device.
-	 */
-	if (test_bit(BTUSB_WAKEUP_DISABLE, &data->flags))
-		device_wakeup_disable(&data->udev->dev);
-
 	if (test_and_set_bit(BTUSB_INTR_RUNNING, &data->flags))
 		goto done;
 
@@ -1423,7 +1416,7 @@ static int btusb_close(struct hci_dev *hdev)
 	data->intf->needs_remote_wakeup = 0;
 
 	/* Enable remote wake up for auto-suspend */
-	if (test_bit(BTUSB_WAKEUP_DISABLE, &data->flags))
+	if (test_bit(BTUSB_WAKEUP_AUTOSUSPEND, &data->flags))
 		data->intf->needs_remote_wakeup = 1;
 
 	usb_autopm_put_interface(data->intf);
@@ -3602,9 +3595,6 @@ static bool btusb_prevent_wake(struct hci_dev *hdev)
 {
 	struct btusb_data *data = hci_get_drvdata(hdev);
 
-	if (test_bit(BTUSB_WAKEUP_DISABLE, &data->flags))
-		return true;
-
 	return !device_may_wakeup(&data->udev->dev);
 }
 
@@ -3882,11 +3872,8 @@ static int btusb_probe(struct usb_interface *intf,
 		hdev->shutdown = btrtl_shutdown_realtek;
 		hdev->cmd_timeout = btusb_rtl_cmd_timeout;
 
-		/* Realtek devices lose their updated firmware over global
-		 * suspend that means host doesn't send SET_FEATURE
-		 * (DEVICE_REMOTE_WAKEUP)
-		 */
-		set_bit(BTUSB_WAKEUP_DISABLE, &data->flags);
+		/* Realtek devices need to set remote wakeup on auto-suspend */
+		set_bit(BTUSB_WAKEUP_AUTOSUSPEND, &data->flags);
 		set_bit(BTUSB_USE_ALT3_FOR_WBS, &data->flags);
 	}
 
@@ -4062,12 +4049,15 @@ static int btusb_suspend(struct usb_interface *intf, pm_message_t message)
 	 * Actually, it depends on whether the usb host sends
 	 * set feature (enable wakeup) or not.
 	 */
-	if (test_bit(BTUSB_WAKEUP_DISABLE, &data->flags)) {
+	if (test_bit(BTUSB_WAKEUP_AUTOSUSPEND, &data->flags)) {
 		if (PMSG_IS_AUTO(message) &&
 		    device_can_wakeup(&data->udev->dev))
 			data->udev->do_remote_wakeup = 1;
-		else if (!PMSG_IS_AUTO(message))
+		else if (!PMSG_IS_AUTO(message) &&
+			 !device_may_wakeup(&data->udev->dev)) {
+			data->udev->do_remote_wakeup = 0;
 			data->udev->reset_resume = 1;
+		}
 	}
 
 	return 0;
-- 
2.17.1