RE: [PATCH] Bluetooth: btusb: Add support USB ALT 3 for WBS

[Hilda Wu]

Hi Marcel,

Thank you!
I will propose a patch v2.

Regards,
Hilda

-----Original Message-----
From: Marcel Holtmann <marcel@xxxxxxxxxxxx> 
Sent: Thursday, May 13, 2021 11:13 PM
To: Hilda Wu <hildawu@xxxxxxxxxxx>
Cc: Johan Hedberg <johan.hedberg@xxxxxxxxx>; Luiz Augusto von Dentz <luiz.dentz@xxxxxxxxx>; Bluetooth Kernel Mailing List <linux-bluetooth@xxxxxxxxxxxxxxx>; open list <linux-kernel@xxxxxxxxxxxxxxx>; Max Chou <max.chou@xxxxxxxxxxx>; alex_lu@xxxxxxxxxxxxxx; KidmanLee <kidman@xxxxxxxxxxx>
Subject: Re: [PATCH] Bluetooth: btusb: Add support USB ALT 3 for WBS

Hi Hilda,

> Because mSBC frames do not need to be aligned to the SCO packet 
> boundary. Using USB ALT 3 let HCI payload >= 60 bytes, let mSBC data 
> satisfy 60 Bytes avoid payload unaligned situation and fixed some 
> headset no voise issue.
> 
> USB Alt 3 supported also need HFP support transparent MTU in 72 Bytes.
> 
> Signed-off-by: hildawu <hildawu@xxxxxxxxxxx>

please use real name here.

> ---
> drivers/bluetooth/btusb.c | 7 +++++++
> 1 file changed, 7 insertions(+)
> 
> diff --git a/drivers/bluetooth/btusb.c b/drivers/bluetooth/btusb.c 
> index 6f253378e893..872034e7a232 100644
> --- a/drivers/bluetooth/btusb.c
> +++ b/drivers/bluetooth/btusb.c
> @@ -1752,6 +1752,13 @@ static void btusb_work(struct work_struct *work)
> 			 * which work with WBS at all.
> 			 */
> 			new_alts = btusb_find_altsetting(data, 6) ? 6 : 1;
> +			/* Because mSBC frames do not need to be aligned to the
> +			 * SCO packet boundary. If support the Alt 3, use the
> +			 * Alt 3 for HCI payload >= 60 Bytes let air packet
> +			 * data satisfy 60 bytes.
> +			 */
> +			if ((new_alts == 1) && (btusb_find_altsetting(data, 3)))
> +				new_alts = 3;

	if (new_alts == 1 && btusb_find_altsetting(..))
		..

Regards

Marcel

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