linux-kernel - Re: [PATCH v1 1/1] Bluetooth: btnxpuart: Add handling for boot-signature timeout errors

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Date: Mon, 3 Jun 2024 09:08:58 +0200
From: Paul Menzel <pmenzel@...gen.mpg.de>
To: Neeraj Sanjay Kale <neeraj.sanjaykale@....com>
Cc: marcel@...tmann.org, luiz.dentz@...il.com,
 linux-bluetooth@...r.kernel.org, linux-kernel@...r.kernel.org,
 amitkumar.karwar@....com, rohit.fule@....com, sherry.sun@....com,
 ziniu.wang_1@....com, haibo.chen@....com, LnxRevLi@....com
Subject: Re: [PATCH v1 1/1] Bluetooth: btnxpuart: Add handling for
 boot-signature timeout errors

Dear Neeraj,


Am 03.06.24 um 08:37 schrieb Neeraj Sanjay Kale:
> This handles the timeout errors seen in the bootloader signatures during
> FW download.

Please add the error to the commit message.

> When the bootloader does not receive a response packet from the host
> within a specific time, it adds an error code to the bootloader
> signature while requesting for the FW chunk from the same offset.
> 
> The host is expected to clear this error code with a NAK, and reply to
> only those bootloader signatures which have error code 0.
> 
> This error handling is valid for data_req bootloader signatures for V3
> and future bootloader versions.
> 
> Signed-off-by: Neeraj Sanjay Kale <neeraj.sanjaykale@....com>

Add a Fixes: tag?

> ---
>   drivers/bluetooth/btnxpuart.c | 46 ++++++++++++++++++++++++++++++++---
>   1 file changed, 42 insertions(+), 4 deletions(-)
> 
> diff --git a/drivers/bluetooth/btnxpuart.c b/drivers/bluetooth/btnxpuart.c
> index 0b93c2ff29e4..2018513fb961 100644
> --- a/drivers/bluetooth/btnxpuart.c
> +++ b/drivers/bluetooth/btnxpuart.c
> @@ -187,6 +187,10 @@ struct btnxpuart_dev {
>   #define NXP_NAK_V3		0x7b
>   #define NXP_CRC_ERROR_V3	0x7c
>   
> +#define NXP_ACK_RX_TIMEOUT	0x0002
> +#define NXP_HDR_RX_TIMEOUT	0x0003
> +#define NXP_DATA_RX_TIMEOUT	0x0004
> +

Please mention the datasheet name, revision and section in the commit 
message for review.

>   #define HDR_LEN			16
>   
>   #define NXP_RECV_CHIP_VER_V1 \
> @@ -277,6 +281,12 @@ struct nxp_bootloader_cmd {
>   	__be32 crc;
>   } __packed;
>   
> +struct nxp_v3_rx_timeout_nak {
> +	u8 nak;
> +	__le32 offset;
> +	u8 crc;
> +} __packed;
> +
>   static u8 crc8_table[CRC8_TABLE_SIZE];
>   
>   /* Default configurations */
> @@ -899,6 +909,32 @@ static int nxp_recv_chip_ver_v3(struct hci_dev *hdev, struct sk_buff *skb)
>   	return 0;
>   }
>   
> +static void nxp_handle_fw_dnld_error(struct hci_dev *hdev, struct v3_data_req *req)

I would not use abbreviations, and use download.

> +{
> +	struct btnxpuart_dev *nxpdev = hci_get_drvdata(hdev);
> +	__u32 offset = __le32_to_cpu(req->offset);
> +	__u16 err = __le16_to_cpu(req->error);
> +	struct nxp_v3_rx_timeout_nak nak_tx_buf;
> +
> +	switch (err) {
> +	case NXP_ACK_RX_TIMEOUT:
> +	case NXP_HDR_RX_TIMEOUT:
> +	case NXP_DATA_RX_TIMEOUT:
> +		nak_tx_buf.nak = NXP_NAK_V3;
> +		nak_tx_buf.offset = __cpu_to_le32(offset);
> +		nak_tx_buf.crc = crc8(crc8_table, (u8 *)&nak_tx_buf,

Can the cast be avoided and written differently?

> +				      sizeof(nak_tx_buf) - 1, 0xff);
> +		serdev_device_write_buf(nxpdev->serdev, (u8 *)&nak_tx_buf,
> +					sizeof(nak_tx_buf));
> +		break;
> +	default:
> +		bt_dev_dbg(hdev, "Unknown bootloader error: %d", err);
> +		break;
> +
> +	}
> +
> +}
> +
>   static int nxp_recv_fw_req_v3(struct hci_dev *hdev, struct sk_buff *skb)
>   {
>   	struct btnxpuart_dev *nxpdev = hci_get_drvdata(hdev);
> @@ -913,7 +949,12 @@ static int nxp_recv_fw_req_v3(struct hci_dev *hdev, struct sk_buff *skb)
>   	if (!req || !nxpdev->fw)
>   		goto free_skb;
>   
> -	nxp_send_ack(NXP_ACK_V3, hdev);
> +	if (!req->error) {
> +		nxp_send_ack(NXP_ACK_V3, hdev);
> +	} else {
> +		nxp_handle_fw_dnld_error(hdev, req);
> +		goto free_skb;
> +	}
>   
>   	len = __le16_to_cpu(req->len);
>   
> @@ -940,9 +981,6 @@ static int nxp_recv_fw_req_v3(struct hci_dev *hdev, struct sk_buff *skb)
>   		wake_up_interruptible(&nxpdev->fw_dnld_done_wait_q);
>   		goto free_skb;
>   	}
> -	if (req->error)
> -		bt_dev_dbg(hdev, "FW Download received err 0x%02x from chip",
> -			   req->error);
>   
>   	offset = __le32_to_cpu(req->offset);
>   	if (offset < nxpdev->fw_v3_offset_correction) {


Kind regards,

Paul