linux-kernel - Re: [PATCH v2 1/2] Bluetooth: btusb: mediatek: refactor btusb_mtk

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Date: Fri, 2 Feb 2024 18:28:56 -0600
From: Sean Wang <sean.wang@...nel.org>
To: Hao Qin <hao.qin@...iatek.com>
Cc: Marcel Holtmann <marcel@...tmann.org>, Johan Hedberg <johan.hedberg@...il.com>, 
	Luiz Von Dentz <luiz.dentz@...il.com>, Sean Wang <sean.wang@...iatek.com>, 
	Deren Wu <deren.Wu@...iatek.com>, Aaron Hou <aaron.hou@...iatek.com>, 
	Chris Lu <chris.lu@...iatek.com>, Steve Lee <steve.lee@...iatek.com>, 
	linux-bluetooth <linux-bluetooth@...r.kernel.org>, 
	linux-kernel <linux-kernel@...r.kernel.org>, 
	linux-mediatek <linux-mediatek@...ts.infradead.org>
Subject: Re: [PATCH v2 1/2] Bluetooth: btusb: mediatek: refactor
 btusb_mtk_reset function

On Tue, Jan 2, 2024 at 6:49 AM Hao Qin <hao.qin@...iatek.com> wrote:
>
> From: "hao.qin" <hao.qin@...iatek.com>
>
> Extract function btusb_mtk_subsys_reset from btusb_mtk_reset
> for future handling of resetting bluetooth controller without
> USB reset.
>
> Signed-off-by: hao.qin <hao.qin@...iatek.com>
>

The patch doesn't modify any logic; it simply divides the existing
logic into two parts,
each prepared to be called in a specific context. Thus,  Acked-by:
Sean Wang <sean.wang@...nel.org>

> ---
> V1 -> V2: refactor btusb_mtk_reset function
>
> Link:
>   https://lore.kernel.org/all/20231215063714.7684-1-hao.qin@mediatek.com/
> ---
>  drivers/bluetooth/btusb.c | 45 +++++++++++++++++++++++----------------
>  1 file changed, 27 insertions(+), 18 deletions(-)
>
> diff --git a/drivers/bluetooth/btusb.c b/drivers/bluetooth/btusb.c
> index 0926e4451802..abefcd1a089d 100644
> --- a/drivers/bluetooth/btusb.c
> +++ b/drivers/bluetooth/btusb.c
> @@ -2994,28 +2994,13 @@ static u32 btusb_mtk_reset_done(struct hci_dev *hdev)
>         return val & MTK_BT_RST_DONE;
>  }
>
> -static int btusb_mtk_reset(struct hci_dev *hdev, void *rst_data)
> +static int btusb_mtk_subsys_reset(struct hci_dev *hdev, u32 dev_id)
>  {
>         struct btusb_data *data = hci_get_drvdata(hdev);
> -       struct btmediatek_data *mediatek;
>         u32 val;
>         int err;
>
> -       /* It's MediaTek specific bluetooth reset mechanism via USB */
> -       if (test_and_set_bit(BTUSB_HW_RESET_ACTIVE, &data->flags)) {
> -               bt_dev_err(hdev, "last reset failed? Not resetting again");
> -               return -EBUSY;
> -       }
> -
> -       err = usb_autopm_get_interface(data->intf);
> -       if (err < 0)
> -               return err;
> -
> -       btusb_stop_traffic(data);
> -       usb_kill_anchored_urbs(&data->tx_anchor);
> -       mediatek = hci_get_priv(hdev);
> -
> -       if (mediatek->dev_id == 0x7925) {
> +       if (dev_id == 0x7925) {
>                 btusb_mtk_uhw_reg_read(data, MTK_BT_RESET_REG_CONNV3, &val);
>                 val |= (1 << 5);
>                 btusb_mtk_uhw_reg_write(data, MTK_BT_RESET_REG_CONNV3, val);
> @@ -3059,8 +3044,32 @@ static int btusb_mtk_reset(struct hci_dev *hdev, void *rst_data)
>         if (!val)
>                 bt_dev_err(hdev, "Can't get device id, subsys reset fail.");
>
> -       usb_queue_reset_device(data->intf);
> +       return err;
> +}
>
> +static int btusb_mtk_reset(struct hci_dev *hdev, void *rst_data)
> +{
> +       struct btusb_data *data = hci_get_drvdata(hdev);
> +       struct btmediatek_data *mediatek;
> +       int err;
> +
> +       /* It's MediaTek specific bluetooth reset mechanism via USB */
> +       if (test_and_set_bit(BTUSB_HW_RESET_ACTIVE, &data->flags)) {
> +               bt_dev_err(hdev, "last reset failed? Not resetting again");
> +               return -EBUSY;
> +       }
> +
> +       err = usb_autopm_get_interface(data->intf);
> +       if (err < 0)
> +               return err;
> +
> +       btusb_stop_traffic(data);
> +       usb_kill_anchored_urbs(&data->tx_anchor);
> +       mediatek = hci_get_priv(hdev);
> +
> +       err = btusb_mtk_subsys_reset(hdev, mediatek->dev_id);
> +
> +       usb_queue_reset_device(data->intf);
>         clear_bit(BTUSB_HW_RESET_ACTIVE, &data->flags);
>
>         return err;
> --
> 2.18.0
>
>