linux-kernel - Re: [PATCH V1 1/2] i2c: tegra: fix 10bit address configuration

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Date:	Tue, 24 Apr 2012 10:58:15 +0200
From:	Jean Delvare <khali@...ux-fr.org>
To:	Laxman Dewangan <ldewangan@...dia.com>
Cc:	w.sang@...gutronix.de, ben-linux@...ff.org, swarren@...dotorg.org,
	olof@...om.net, linux-i2c@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH V1 1/2] i2c: tegra: fix 10bit address configuration

On Tue, 24 Apr 2012 12:49:35 +0530, Laxman Dewangan wrote:
> The slave address of device to be configured in packet
> header as follows:
>     7 bit address: PacketHeader3[7:1]
>     10 bit address: PacketHeader3[9:0]
> 
> Fixing the code to make packet header3 properly.
> 
> Signed-off-by: Laxman Dewangan <ldewangan@...dia.com>
> ---
>  drivers/i2c/busses/i2c-tegra.c |   11 +++++++----
>  1 files changed, 7 insertions(+), 4 deletions(-)
> 
> diff --git a/drivers/i2c/busses/i2c-tegra.c b/drivers/i2c/busses/i2c-tegra.c
> index 55e5ea6..18067b3 100644
> --- a/drivers/i2c/busses/i2c-tegra.c
> +++ b/drivers/i2c/busses/i2c-tegra.c
> @@ -476,12 +476,15 @@ static int tegra_i2c_xfer_msg(struct tegra_i2c_dev *i2c_dev,
>  	packet_header = msg->len - 1;
>  	i2c_writel(i2c_dev, packet_header, I2C_TX_FIFO);
>  
> -	packet_header = msg->addr << I2C_HEADER_SLAVE_ADDR_SHIFT;
> -	packet_header |= I2C_HEADER_IE_ENABLE;
> +	packet_header = I2C_HEADER_IE_ENABLE;
>  	if (!stop)
>  		packet_header |= I2C_HEADER_REPEAT_START;
> -	if (msg->flags & I2C_M_TEN)
> +	if (msg->flags & I2C_M_TEN) {
> +		packet_header |= msg->addr;
>  		packet_header |= I2C_HEADER_10BIT_ADDR;
> +	} else {
> +		packet_header |= msg->addr << I2C_HEADER_SLAVE_ADDR_SHIFT;
> +	}
>  	if (msg->flags & I2C_M_IGNORE_NAK)
>  		packet_header |= I2C_HEADER_CONT_ON_NAK;
>  	if (msg->flags & I2C_M_RD)
> @@ -557,7 +560,7 @@ static int tegra_i2c_xfer(struct i2c_adapter *adap, struct i2c_msg msgs[],
>  
>  static u32 tegra_i2c_func(struct i2c_adapter *adap)
>  {
> -	return I2C_FUNC_I2C | I2C_FUNC_SMBUS_EMUL;
> +	return I2C_FUNC_I2C | I2C_FUNC_SMBUS_EMUL | I2C_FUNC_10BIT_ADDR;
>  }
>  
>  static const struct i2c_algorithm tegra_i2c_algo = {

Looks good.

Acked-by: Jean Delvare <khali@...ux-fr.org>

Not that 10-bit address devices are immensely popular though...

-- 
Jean Delvare
--
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