linux-kernel - Re: [PATCH v4 1/2] i2c: tegra: Fix PEC support for SMBUS block read

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Date:   Thu, 13 Apr 2023 12:40:09 +0300
From:   Dmitry Osipenko <dmitry.osipenko@...labora.com>
To:     Akhil R <akhilrajeev@...dia.com>, christian.koenig@....com,
        digetx@...il.com, jonathanh@...dia.com, ldewangan@...dia.com,
        linux-i2c@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-tegra@...r.kernel.org, sumit.semwal@...aro.org,
        thierry.reding@...il.com, wsa@...nel.org
Subject: Re: [PATCH v4 1/2] i2c: tegra: Fix PEC support for SMBUS block read

On 3/24/23 14:59, Akhil R wrote:
...
> @@ -279,6 +280,7 @@ struct tegra_i2c_dev {
>  	size_t msg_buf_remaining;
>  	int msg_err;
>  	u8 *msg_buf;
> +	__u16 msg_len;

__u16 is for UAPI headers, please use unsigned int. Also keep variables
sorted by string length.

>  	struct completion dma_complete;
>  	struct dma_chan *tx_dma_chan;
> @@ -1169,7 +1171,7 @@ static void tegra_i2c_push_packet_header(struct tegra_i2c_dev *i2c_dev,
>  	else
>  		i2c_writel(i2c_dev, packet_header, I2C_TX_FIFO);
>  
> -	packet_header = msg->len - 1;
> +	packet_header = i2c_dev->msg_len - 1;
>  
>  	if (i2c_dev->dma_mode && !i2c_dev->msg_read)
>  		*dma_buf++ = packet_header;
> @@ -1242,20 +1244,32 @@ static int tegra_i2c_xfer_msg(struct tegra_i2c_dev *i2c_dev,
>  		return err;
>  
>  	i2c_dev->msg_buf = msg->buf;
> +	i2c_dev->msg_len = msg->len;
>  
> -	/* The condition true implies smbus block read and len is already read */
> -	if (msg->flags & I2C_M_RECV_LEN && end_state != MSG_END_CONTINUE)
> -		i2c_dev->msg_buf = msg->buf + 1;
> -
> -	i2c_dev->msg_buf_remaining = msg->len;
>  	i2c_dev->msg_err = I2C_ERR_NONE;
>  	i2c_dev->msg_read = !!(msg->flags & I2C_M_RD);
>  	reinit_completion(&i2c_dev->msg_complete);
>  
> +	/* *

Please correct the comment style

> +	 * For SMBUS block read command, read only 1 byte in the first transfer.
> +	 * Adjust that 1 byte for the next transfer in the msg buffer and msg
> +	 * length.
> +	 */


-- 
Best regards,
Dmitry