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Subject[PATCH v3] Bluetooth: btusb: Fix suspend issue for Realtek devices
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
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