[v1] Bluetooth: btmtk: Fix failed to send func ctrl for MediaTek devices.

Use usb_autopm_get_interface() and usb_autopm_put_interface()
in btmtk_usb_shutdown(), it could send func ctrl after enabling
autosuspend.

Bluetooth: btusb_mtk_hci_wmt_sync() hci0: Execution of wmt command
           timed out
Bluetooth: btusb_mtk_shutdown() hci0: Failed to send wmt func ctrl
           (-110)

Signed-off-by: Chris Lu <chris.lu@mediatek.com>
---
 drivers/bluetooth/btmtk.c | 7 +++++++
 1 file changed, 7 insertions(+)

Hi Chris,

On Mon, Dec 23, 2024 at 3:58 AM Chris Lu <chris.lu@mediatek.com> wrote:
>
> Use usb_autopm_get_interface() and usb_autopm_put_interface()
> in btmtk_usb_shutdown(), it could send func ctrl after enabling
> autosuspend.
>
> Bluetooth: btusb_mtk_hci_wmt_sync() hci0: Execution of wmt command
>            timed out
> Bluetooth: btusb_mtk_shutdown() hci0: Failed to send wmt func ctrl
>            (-110)
>
> Signed-off-by: Chris Lu <chris.lu@mediatek.com>

Missing Fixes tag, Ive been adding it myself for some time now but you
better create the practice to include it so I don't have to go find
what commit introduced btmtk_usb_shutdown to then do git log -1
--pretty=fixes and git commit --amend.

> ---
>  drivers/bluetooth/btmtk.c | 7 +++++++
>  1 file changed, 7 insertions(+)
>
> diff --git a/drivers/bluetooth/btmtk.c b/drivers/bluetooth/btmtk.c
> index 7fd9d5ddce02..224eafc27dbe 100644
> --- a/drivers/bluetooth/btmtk.c
> +++ b/drivers/bluetooth/btmtk.c
> @@ -1472,10 +1472,15 @@ EXPORT_SYMBOL_GPL(btmtk_usb_setup);
>
>  int btmtk_usb_shutdown(struct hci_dev *hdev)
>  {
> +       struct btmtk_data *data = hci_get_priv(hdev);
>         struct btmtk_hci_wmt_params wmt_params;
>         u8 param = 0;
>         int err;
>
> +       err = usb_autopm_get_interface(data->intf);
> +       if (err < 0)
> +               return err;
> +
>         /* Disable the device */
>         wmt_params.op = BTMTK_WMT_FUNC_CTRL;
>         wmt_params.flag = 0;
> @@ -1486,9 +1491,11 @@ int btmtk_usb_shutdown(struct hci_dev *hdev)
>         err = btmtk_usb_hci_wmt_sync(hdev, &wmt_params);
>         if (err < 0) {
>                 bt_dev_err(hdev, "Failed to send wmt func ctrl (%d)", err);
> +               usb_autopm_put_interface(data->intf);
>                 return err;
>         }
>
> +       usb_autopm_put_interface(data->intf);
>         return 0;
>  }
>  EXPORT_SYMBOL_GPL(btmtk_usb_shutdown);
> --
> 2.45.2
>

Hi Luiz,

Thanks for your reply.

On Mon, 2025-01-06 at 15:44 -0500, Luiz Augusto von Dentz wrote:
> 
> External email : Please do not click links or open attachments until
> you have verified the sender or the content.
> 
> 
> Hi Chris,
> 
> On Mon, Dec 23, 2024 at 3:58 AM Chris Lu <chris.lu@mediatek.com>
> wrote:
> > 
> > Use usb_autopm_get_interface() and usb_autopm_put_interface()
> > in btmtk_usb_shutdown(), it could send func ctrl after enabling
> > autosuspend.
> > 
> > Bluetooth: btusb_mtk_hci_wmt_sync() hci0: Execution of wmt command
> >            timed out
> > Bluetooth: btusb_mtk_shutdown() hci0: Failed to send wmt func ctrl
> >            (-110)
> > 
> > Signed-off-by: Chris Lu <chris.lu@mediatek.com>
> 
> Missing Fixes tag, Ive been adding it myself for some time now but
> you
> better create the practice to include it so I don't have to go find
> what commit introduced btmtk_usb_shutdown to then do git log -1
> --pretty=fixes and git commit --amend.
> 
This change was submitted by another MediaTek member around two years
ago (but it was ignored and wasn't merged at that time). We recently
found it was missed when reviewing our btusb changes and trying to
submit it again.

Anyway, I'll do another submit to add fixes tag. Thank you for the
reminder.
> > ---
> >  drivers/bluetooth/btmtk.c | 7 +++++++
> >  1 file changed, 7 insertions(+)
> > 
> > diff --git a/drivers/bluetooth/btmtk.c b/drivers/bluetooth/btmtk.c
> > index 7fd9d5ddce02..224eafc27dbe 100644
> > --- a/drivers/bluetooth/btmtk.c
> > +++ b/drivers/bluetooth/btmtk.c
> > @@ -1472,10 +1472,15 @@ EXPORT_SYMBOL_GPL(btmtk_usb_setup);
> > 
> >  int btmtk_usb_shutdown(struct hci_dev *hdev)
> >  {
> > +       struct btmtk_data *data = hci_get_priv(hdev);
> >         struct btmtk_hci_wmt_params wmt_params;
> >         u8 param = 0;
> >         int err;
> > 
> > +       err = usb_autopm_get_interface(data->intf);
> > +       if (err < 0)
> > +               return err;
> > +
> >         /* Disable the device */
> >         wmt_params.op = BTMTK_WMT_FUNC_CTRL;
> >         wmt_params.flag = 0;
> > @@ -1486,9 +1491,11 @@ int btmtk_usb_shutdown(struct hci_dev *hdev)
> >         err = btmtk_usb_hci_wmt_sync(hdev, &wmt_params);
> >         if (err < 0) {
> >                 bt_dev_err(hdev, "Failed to send wmt func ctrl
> > (%d)", err);
> > +               usb_autopm_put_interface(data->intf);
> >                 return err;
> >         }
> > 
> > +       usb_autopm_put_interface(data->intf);
> >         return 0;
> >  }
> >  EXPORT_SYMBOL_GPL(btmtk_usb_shutdown);
> > --
> > 2.45.2
> > 
> 
> 
> --
> Luiz Augusto von Dentz

Thanks,
Chris Lu