linux-kernel - Re: [PATCH v3 1/1] Bluetooth: btusb: Record debug log for Mediatek Chip.

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Date:   Wed, 30 Jun 2021 22:12:48 +0200
From:   Marcel Holtmann <marcel@...tmann.org>
To:     Mark-YW.Chen@...iatek.com
Cc:     Johan Hedberg <johan.hedberg@...il.com>, chris.lu@...iatek.com,
        will-cy.lee@...iatek.com, Sean Wang <sean.wang@...iatek.com>,
        Bluetooth Kernel Mailing List 
        <linux-bluetooth@...r.kernel.org>,
        linux-mediatek@...ts.infradead.org,
        open list <linux-kernel@...r.kernel.org>,
        michaelfsun@...gle.com, shawnku@...gle.com, jemele@...gle.com,
        apusaka@...gle.com
Subject: Re: [PATCH v3 1/1] Bluetooth: btusb: Record debug log for Mediatek
 Chip.

Hi Mark,

> Mediatek Bluetooth Controller send the fw log via EP2, this patch
> create callback(data->recv_acl) for processing acl packet.
> 
> 1. create callback(data->recv_acl) for processing acl packet.
> 2. Add btusb_recv_acl_mtk to dispatch acl packet.
> 3. Send mediatek debug log and coredump via hci_recv_diag channel.
> 4. The upper layerd can use hci_channel_minitor to receive
>   these packets.

can you be more specific in what the logs do. I think the changes are easy to understand. I rather have an example btmon from this or more details on what is in these traces. Or even how they can be enabled etc.

> 
> Signed-off-by: mark-yw.chen <mark-yw.chen@...iatek.com>
> ---
> drivers/bluetooth/btusb.c | 37 ++++++++++++++++++++++++++++++++++++-
> 1 file changed, 36 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/bluetooth/btusb.c b/drivers/bluetooth/btusb.c
> index b015dcecfb13..cabf6eba2d95 100644
> --- a/drivers/bluetooth/btusb.c
> +++ b/drivers/bluetooth/btusb.c
> @@ -569,6 +569,7 @@ struct btusb_data {
> 	int suspend_count;
> 
> 	int (*recv_event)(struct hci_dev *hdev, struct sk_buff *skb);
> +	int (*recv_acl)(struct hci_dev *hdev, struct sk_buff *skb);
> 	int (*recv_bulk)(struct btusb_data *data, void *buffer, int count);
> 
> 	int (*setup_on_usb)(struct hci_dev *hdev);
> @@ -776,7 +777,7 @@ static int btusb_recv_bulk(struct btusb_data *data, void *buffer, int count)
> 
> 		if (!hci_skb_expect(skb)) {
> 			/* Complete frame */
> -			hci_recv_frame(data->hdev, skb);
> +			data->recv_acl(data->hdev, skb);
> 			skb = NULL;
> 		}
> 	}
> @@ -3075,6 +3076,10 @@ static int btusb_shutdown_intel_new(struct hci_dev *hdev)
> 	return 0;
> }
> 
> +#define MTK_FW_DUMP	0xfc6f
> +#define MTK_FW_LOG_1	0x05ff
> +#define MTK_FW_LOG_2	0x05fe
> +
> #define FIRMWARE_MT7663		"mediatek/mt7663pr2h.bin"
> #define FIRMWARE_MT7668		"mediatek/mt7668pr2h.bin"
> 
> @@ -3851,6 +3856,33 @@ static int btusb_mtk_shutdown(struct hci_dev *hdev)
> 	return 0;
> }
> 
> +static int btusb_recv_acl_mtk(struct hci_dev *hdev, struct sk_buff *skb)
> +{
> +	struct btusb_data *data = hci_get_drvdata(hdev);
> +	int err;
> +	u16 handle = le16_to_cpu(hci_acl_hdr(skb)->handle);
> +
> +	switch (handle) {
> +	case MTK_FW_DUMP:
> +		/* It's MediaTek firmware dump from device. When the firmware
> +		 * hang, the device can't be suspend successfully.
> +		 */
> +		usb_disable_autosuspend(data->udev);
> +		err = hci_recv_diag(data->hdev, skb);
> +		break;
> +	case MTK_FW_LOG_1:
> +	case MTK_FW_LOG_2:
> +		/* It's MediaTek fw debug log */
> +		err = hci_recv_diag(data->hdev, skb);
> +		break;
> +	default:
> +		err = hci_recv_frame(data->hdev, skb);
> +		break;
> +	}
> +
> +	return err;


	switch (handle) {
	case 0xfc6f:		/* Firmware dump from device */
		/* When the firmware hangs, the device can no longer
		 * suspend and thus disable auto-suspend.
		 */
		usb_disable_autosuspend(data->udev);
		/* fall through */

	case 0x05ff:		/* Firmware debug logging 1 */
	case 0x05fe:		/* Firmware debug logging 2 */
		return hci_recv_diag(data->hdev, skb);
	}

	return hci_recv_frame(data->hdev, skb);
}

> +}
> +
> MODULE_FIRMWARE(FIRMWARE_MT7663);
> MODULE_FIRMWARE(FIRMWARE_MT7668);
> 
> @@ -4543,6 +4575,8 @@ static int btusb_probe(struct usb_interface *intf,
> 		data->recv_bulk = btusb_recv_bulk;
> 	}
> 
> +	data->recv_acl = hci_recv_frame;
> +
> 	hdev = hci_alloc_dev();
> 	if (!hdev)
> 		return -ENOMEM;
> @@ -4669,6 +4703,7 @@ static int btusb_probe(struct usb_interface *intf,
> 		hdev->setup = btusb_mtk_setup;
> 		hdev->shutdown = btusb_mtk_shutdown;
> 		hdev->manufacturer = 70;
> +		data->recv_acl = btusb_recv_acl_mtk;
> 		set_bit(HCI_QUIRK_NON_PERSISTENT_SETUP, &hdev->quirks);

Move this change after the quirk setting since it is local to btusb and not the hdev.

> 	}

Regards

Marcel