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@xxxxxxxxxxxxxx>
> ---
> drivers/bluetooth/btusb.c | 40 +++++++++++++++++++++++++++++++++++----
> 1 file changed, 36 insertions(+), 4 deletions(-)
>
> diff --git a/drivers/bluetooth/btusb.c b/drivers/bluetooth/btusb.c
> index 50aed5259c2b..69f6b4208901 100644
> --- a/drivers/bluetooth/btusb.c
> +++ b/drivers/bluetooth/btusb.c
> @@ -426,6 +426,7 @@ static const struct dmi_system_id btusb_needs_reset_resume_table[] = {
> #define BTUSB_DIAG_RUNNING 10
> #define BTUSB_OOB_WAKE_ENABLED 11
> #define BTUSB_HW_RESET_ACTIVE 12
> +#define BTUSB_QUIRK_SUSPEND 13
I think this name is not really descriptive. What about BTUSB_SUSPEND_DISABLE or BTUSB_WAKEUP_DISABLE or BTUSB_REMOTE_WAKEUP or something that is rather clear.
>
> struct btusb_data {
> struct hci_dev *hdev;
> @@ -1165,6 +1166,15 @@ 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.
> + */
> +#ifdef CONFIG_BT_HCIBTUSB_RTL
> + if (test_bit(BTUSB_QUIRK_SUSPEND, &data->flags))
> + device_wakeup_disable(&data->udev->dev);
> +#endif
> +
I have no idea what the #ifdef does here. Limiting it to HCIBTUSB_RTL seems pointless.
> if (test_and_set_bit(BTUSB_INTR_RUNNING, &data->flags))
> goto done;
>
> @@ -1227,6 +1237,13 @@ static int btusb_close(struct hci_dev *hdev)
> goto failed;
>
> data->intf->needs_remote_wakeup = 0;
> +
> + /* Enable remote wake up for auto-suspend */
> +#ifdef CONFIG_BT_HCIBTUSB_RTL
> + if (test_bit(BTUSB_QUIRK_SUSPEND, &data->flags))
> + data->intf->needs_remote_wakeup = 1;
> +#endif
> +
Same comment as above. No need for the #ifdef.
> device_wakeup_disable(&data->udev->dev);
> usb_autopm_put_interface(data->intf);
>
> @@ -3185,11 +3202,11 @@ static int btusb_probe(struct usb_interface *intf,
> if (id->driver_info & BTUSB_REALTEK) {
> hdev->setup = btrtl_setup_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_QUIRK_SUSPEND, &data->flags);
> }
> #endif
>
> @@ -3363,6 +3380,21 @@ static int btusb_suspend(struct usb_interface *intf, pm_message_t message)
> enable_irq(data->oob_wake_irq);
> }
>
> +#ifdef CONFIG_BT_HCIBTUSB_RTL
> + /* 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_QUIRK_SUSPEND, &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;
> + }
> +#endif
> +
The #ifdef is also not needed here.
Regards
Marcel
