linux-kernel - Re: [PATCH] Bluetooth: btusb: mediatek: Support auto revert for MT7922

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Message-ID: <CABBYNZJ-rvMuqHjFmQuxhmWv_K5fGFktAk-CeZfx8rw36L-Etg@mail.gmail.com>
Date: Wed, 17 Apr 2024 17:17:50 -0400
From: Luiz Augusto von Dentz <luiz.dentz@...il.com>
To: Hao Qin <hao.qin@...iatek.com>
Cc: Marcel Holtmann <marcel@...tmann.org>, Johan Hedberg <johan.hedberg@...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] Bluetooth: btusb: mediatek: Support auto revert for MT7922

Hi,

On Fri, Apr 12, 2024 at 5:57 AM Hao Qin <hao.qin@...iatek.com> wrote:
>
> Add support for auto reverting MT7922 during reset process.

Need some more information of what auto reverting means in this
context and what problem does it solves?

>
> Signed-off-by: Hao Qin <hao.qin@...iatek.com>
> ---
>  drivers/bluetooth/btusb.c | 14 +++++++++++++-
>  1 file changed, 13 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/bluetooth/btusb.c b/drivers/bluetooth/btusb.c
> index 4c0cc13adb47..0ad96ec8d31d 100644
> --- a/drivers/bluetooth/btusb.c
> +++ b/drivers/bluetooth/btusb.c
> @@ -3032,7 +3032,16 @@ static int btusb_mtk_reset(struct hci_dev *hdev, void *rst_data)
>         usb_kill_anchored_urbs(&data->tx_anchor);
>         mediatek = hci_get_priv(hdev);
>
> -       if (mediatek->dev_id == 0x7925) {
> +       if (mediatek->dev_id == 0x7922) {
> +               btusb_mtk_uhw_reg_read(data, MTK_BT_SUBSYS_RST, &val);
> +               val |= 0x00002020;
> +               btusb_mtk_uhw_reg_write(data, MTK_BT_SUBSYS_RST, val);
> +               btusb_mtk_uhw_reg_write(data, MTK_EP_RST_OPT, 0x00010001);
> +               btusb_mtk_uhw_reg_read(data, MTK_BT_SUBSYS_RST, &val);
> +               val |= BIT(0);
> +               btusb_mtk_uhw_reg_write(data, MTK_BT_SUBSYS_RST, val);
> +               msleep(100);
> +       } else if (mediatek->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);
> @@ -3072,6 +3081,9 @@ static int btusb_mtk_reset(struct hci_dev *hdev, void *rst_data)
>         if (err < 0)
>                 bt_dev_err(hdev, "Reset timeout");
>
> +       if (mediatek->dev_id == 0x7922)
> +               btusb_mtk_uhw_reg_write(data, MTK_UDMA_INT_STA_BT, 0x000000FF);
> +
>         btusb_mtk_id_get(data, 0x70010200, &val);
>         if (!val)
>                 bt_dev_err(hdev, "Can't get device id, subsys reset fail.");
> --
> 2.18.0
>


-- 
Luiz Augusto von Dentz