Linux-Bluetooth Archive on lore.kernel.org
 help / color / Atom feed
* [PATCH v3] Bluetooth: btusb: Fix suspend issue for Realtek devices
@ 2019-08-14 12:02 Alex Lu
  2019-08-14 13:53 ` Marcel Holtmann
  0 siblings, 1 reply; 3+ messages in thread
From: Alex Lu @ 2019-08-14 12:02 UTC (permalink / raw)
  To: Marcel Holtmann; +Cc: Johan Hedberg, linux-bluetooth, linux-kernel, Max Chou

From: Alex Lu <alex_lu@realsil.com.cn>

From the perspective of controller, global suspend means there is no
SET_FEATURE (DEVICE_REMOTE_WAKEUP) and controller would drop the
firmware. It would consume less power. So we should not send this kind
of SET_FEATURE when host goes to suspend state.
Otherwise, when making device enter selective suspend, host should send
SET_FEATURE to make sure the firmware remains.

Signed-off-by: Alex Lu <alex_lu@realsil.com.cn>
---
Changes in v3:
  - Change to fit for bluetooth-next
Changes in v2:
  - Change flag to be more descriptive
  - Delete pointless #ifdef CONFIG_BT_HCIBTUSB_RTL and #endif

 drivers/bluetooth/btusb.c | 34 ++++++++++++++++++++++++++++++----
 1 file changed, 30 insertions(+), 4 deletions(-)

diff --git a/drivers/bluetooth/btusb.c b/drivers/bluetooth/btusb.c
index 3876fee6ad13..b606c663ba57 100644
--- a/drivers/bluetooth/btusb.c
+++ b/drivers/bluetooth/btusb.c
@@ -435,6 +435,7 @@ 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
 
 struct btusb_data {
 	struct hci_dev       *hdev;
@@ -1175,6 +1176,13 @@ static int btusb_open(struct hci_dev *hdev)
 	 */
 	device_wakeup_enable(&data->udev->dev);
 
+	/* 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;
 
@@ -1238,6 +1246,11 @@ static int btusb_close(struct hci_dev *hdev)
 		goto failed;
 
 	data->intf->needs_remote_wakeup = 0;
+
+	/* Enable remote wake up for auto-suspend */
+	if (test_bit(BTUSB_WAKEUP_DISABLE, &data->flags))
+		data->intf->needs_remote_wakeup = 1;
+
 	device_wakeup_disable(&data->udev->dev);
 	usb_autopm_put_interface(data->intf);
 
@@ -3769,11 +3782,11 @@ static int btusb_probe(struct usb_interface *intf,
 		hdev->setup = btrtl_setup_realtek;
 		hdev->shutdown = btrtl_shutdown_realtek;
 
-		/* Realtek devices lose their updated firmware over suspend,
-		 * but the USB hub doesn't notice any status change.
-		 * Explicitly request a device reset on resume.
+		/* Realtek devices lose their updated firmware over global
+		 * suspend that means host doesn't send SET_FEATURE
+		 * (DEVICE_REMOTE_WAKEUP)
 		 */
-		interface_to_usbdev(intf)->quirks |= USB_QUIRK_RESET_RESUME;
+		set_bit(BTUSB_WAKEUP_DISABLE, &data->flags);
 	}
 #endif
 
@@ -3947,6 +3960,19 @@ static int btusb_suspend(struct usb_interface *intf, pm_message_t message)
 		enable_irq(data->oob_wake_irq);
 	}
 
+	/* For global suspend, Realtek devices lose the loaded fw
+	 * in them. But for autosuspend, firmware should remain.
+	 * Actually, it depends on whether the usb host sends
+	 * set feature (enable wakeup) or not.
+	 */
+	if (test_bit(BTUSB_WAKEUP_DISABLE, &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))
+			data->udev->reset_resume = 1;
+	}
+
 	return 0;
 }
 
-- 
2.19.2


^ permalink raw reply	[flat|nested] 3+ messages in thread

* Re: [PATCH v3] Bluetooth: btusb: Fix suspend issue for Realtek devices
  2019-08-14 12:02 [PATCH v3] Bluetooth: btusb: Fix suspend issue for Realtek devices Alex Lu
@ 2019-08-14 13:53 ` Marcel Holtmann
  2019-08-19  9:28   ` Max Chou
  0 siblings, 1 reply; 3+ messages in thread
From: Marcel Holtmann @ 2019-08-14 13:53 UTC (permalink / raw)
  To: Alex Lu; +Cc: Johan Hedberg, linux-bluetooth, linux-kernel, Max Chou

Hi Alex,

> From the perspective of controller, global suspend means there is no
> SET_FEATURE (DEVICE_REMOTE_WAKEUP) and controller would drop the
> firmware. It would consume less power. So we should not send this kind
> of SET_FEATURE when host goes to suspend state.
> Otherwise, when making device enter selective suspend, host should send
> SET_FEATURE to make sure the firmware remains.
> 
> Signed-off-by: Alex Lu <alex_lu@realsil.com.cn>
> ---
> Changes in v3:
>  - Change to fit for bluetooth-next
> Changes in v2:
>  - Change flag to be more descriptive
>  - Delete pointless #ifdef CONFIG_BT_HCIBTUSB_RTL and #endif
> 
> drivers/bluetooth/btusb.c | 34 ++++++++++++++++++++++++++++++----
> 1 file changed, 30 insertions(+), 4 deletions(-)

patch has been applied to bluetooth-next tree.

Regards

Marcel


^ permalink raw reply	[flat|nested] 3+ messages in thread

* RE: [PATCH v3] Bluetooth: btusb: Fix suspend issue for Realtek devices
  2019-08-14 13:53 ` Marcel Holtmann
@ 2019-08-19  9:28   ` Max Chou
  0 siblings, 0 replies; 3+ messages in thread
From: Max Chou @ 2019-08-19  9:28 UTC (permalink / raw)
  To: Marcel Holtmann, alex_lu; +Cc: Johan Hedberg, linux-bluetooth, linux-kernel

Dear Kernel Maintainer Marcel, 
Sorry for the inconvenience. For the original target, this patch is edited for low power consumption hence controller should not receive DEVICE_REMOTE_WAKE_UP that it's able to save power in suspend mode because BT wake-up function is disabled.
In upstream driver, there should be higher priority for function rather than performance. In other words, this patch can meet the low power consumption in suspend mode but will lose BT wake-up function. It is not a good idea for that. Please help to revert this modification. 
Thank you.


BRs,
Max


-----Original Message-----
From: Marcel Holtmann <marcel@holtmann.org> 
Sent: Wednesday, August 14, 2019 9:54 PM
To: alex_lu <alex_lu@realsil.com.cn>
Cc: Johan Hedberg <johan.hedberg@gmail.com>; linux-bluetooth@vger.kernel.org; linux-kernel@vger.kernel.org; Max Chou <max.chou@realtek.com>
Subject: Re: [PATCH v3] Bluetooth: btusb: Fix suspend issue for Realtek devices

Hi Alex,

> From the perspective of controller, global suspend means there is no 
> SET_FEATURE (DEVICE_REMOTE_WAKEUP) and controller would drop the 
> firmware. It would consume less power. So we should not send this kind 
> of SET_FEATURE when host goes to suspend state.
> Otherwise, when making device enter selective suspend, host should 
> send SET_FEATURE to make sure the firmware remains.
> 
> Signed-off-by: Alex Lu <alex_lu@realsil.com.cn>
> ---
> Changes in v3:
>  - Change to fit for bluetooth-next
> Changes in v2:
>  - Change flag to be more descriptive
>  - Delete pointless #ifdef CONFIG_BT_HCIBTUSB_RTL and #endif
> 
> drivers/bluetooth/btusb.c | 34 ++++++++++++++++++++++++++++++----
> 1 file changed, 30 insertions(+), 4 deletions(-)

patch has been applied to bluetooth-next tree.

Regards

Marcel


------Please consider the environment before printing this e-mail.

^ permalink raw reply	[flat|nested] 3+ messages in thread

end of thread, back to index

Thread overview: 3+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2019-08-14 12:02 [PATCH v3] Bluetooth: btusb: Fix suspend issue for Realtek devices Alex Lu
2019-08-14 13:53 ` Marcel Holtmann
2019-08-19  9:28   ` Max Chou

Linux-Bluetooth Archive on lore.kernel.org

Archives are clonable:
	git clone --mirror https://lore.kernel.org/linux-bluetooth/0 linux-bluetooth/git/0.git

	# If you have public-inbox 1.1+ installed, you may
	# initialize and index your mirror using the following commands:
	public-inbox-init -V2 linux-bluetooth linux-bluetooth/ https://lore.kernel.org/linux-bluetooth \
		linux-bluetooth@vger.kernel.org linux-bluetooth@archiver.kernel.org
	public-inbox-index linux-bluetooth


Newsgroup available over NNTP:
	nntp://nntp.lore.kernel.org/org.kernel.vger.linux-bluetooth


AGPL code for this site: git clone https://public-inbox.org/ public-inbox