linux-kernel - Re: [PATCH] Bluetooth: btusb: WBS support USB alternate setting 1

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Date:   Mon, 29 Jun 2020 08:19:21 +0200
From:   Marcel Holtmann <marcel@...tmann.org>
To:     hildawu@...ltek.com
Cc:     Johan Hedberg <johan.hedberg@...il.com>,
        Matthias Brugger <matthias.bgg@...il.com>,
        BlueZ <linux-bluetooth@...r.kernel.org>,
        kernel list <linux-kernel@...r.kernel.org>,
        linux-arm-kernel@...ts.infradead.org,
        linux-mediatek@...ts.infradead.org, max.chou@...ltek.com,
        alex_lu@...lsil.com.cn, kidman@...ltek.com
Subject: Re: [PATCH] Bluetooth: btusb: WBS support USB alternate setting 1

Hi Hilda,

> For WBS support, btusb driver could be set to alternate setting 1.

please be more descriptive since this is special for Realtek devices.

> 
> Signed-off-by: Hilda Wu <hildawu@...ltek.com>
> ---
> drivers/bluetooth/btusb.c | 16 +++++++++++-----
> 1 file changed, 11 insertions(+), 5 deletions(-)
> 
> diff --git a/drivers/bluetooth/btusb.c b/drivers/bluetooth/btusb.c
> index c7cc8e594166..7942f9314fd7 100644
> --- a/drivers/bluetooth/btusb.c
> +++ b/drivers/bluetooth/btusb.c
> @@ -453,6 +453,7 @@ static const struct dmi_system_id btusb_needs_reset_resume_table[] = {
> #define BTUSB_HW_RESET_ACTIVE	12
> #define BTUSB_TX_WAIT_VND_EVT	13
> #define BTUSB_WAKEUP_DISABLE	14
> +#define BTUSB_WBS_ALT1		15

Use BTUSB_USE_ALT1_FOR_WBS as a more descriptive name.

> 
> struct btusb_data {
> 	struct hci_dev       *hdev;
> @@ -1666,14 +1667,18 @@ static void btusb_work(struct work_struct *work)
> 				new_alts = data->sco_num;
> 			}
> 		} else if (data->air_mode == HCI_NOTIFY_ENABLE_SCO_TRANSP) {
> -
> -			data->usb_alt6_packet_flow = true;
> -
> 			/* Check if Alt 6 is supported for Transparent audio */
> -			if (btusb_find_altsetting(data, 6))
> +			if (btusb_find_altsetting(data, 6)) {
> +				data->usb_alt6_packet_flow = true;
> 				new_alts = 6;
> -			else
> +			} else if (test_bit(BTUSB_WBS_ALT1, &data->flags)) {
> +				if (btusb_find_altsetting(data, 1))
> +					new_alts = 1;
> +				else
> +					bt_dev_err(hdev, "Device does not support ALT setting 1");

Scrap this check and error and move it into the probe() function if you actually have Realtek hardware that does not support alternate setting 1.

> +			} else {
> 				bt_dev_err(hdev, "Device does not support ALT setting 6");
> +			}
> 		}
> 
> 		if (btusb_switch_alt_setting(hdev, new_alts) < 0)
> @@ -3965,6 +3970,7 @@ static int btusb_probe(struct usb_interface *intf,
> 		 * (DEVICE_REMOTE_WAKEUP)
> 		 */
> 		set_bit(BTUSB_WAKEUP_DISABLE, &data->flags);
> +		set_bit(BTUSB_WBS_ALT1, &data->flags);
> 
> 		err = usb_autopm_get_interface(intf);
> 		if (err < 0)

Regards

Marcel