linux-kernel - Re: [PATCH v5] media: Driver for Toshiba et8ek8 5MP sensor

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Date:   Wed, 21 Dec 2016 15:42:36 +0200
From:   Sakari Ailus <sakari.ailus@....fi>
To:     Pavel Machek <pavel@....cz>
Cc:     ivo.g.dimitrov.75@...il.com, sre@...nel.org, pali.rohar@...il.com,
        linux-media@...r.kernel.org, galak@...eaurora.org,
        mchehab@....samsung.com, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v5] media: Driver for Toshiba et8ek8 5MP sensor

Hi Pavel,

Thanks for the update.

On Wed, Dec 14, 2016 at 01:24:51PM +0100, Pavel Machek wrote:
...
> +static int et8ek8_set_ctrl(struct v4l2_ctrl *ctrl)
> +{
> +	struct et8ek8_sensor *sensor =
> +		container_of(ctrl->handler, struct et8ek8_sensor, ctrl_handler);
> +
> +	switch (ctrl->id) {
> +	case V4L2_CID_GAIN:
> +		return et8ek8_set_gain(sensor, ctrl->val);
> +
> +	case V4L2_CID_EXPOSURE:
> +	{
> +		int rows;
> +		struct i2c_client *client = v4l2_get_subdevdata(&sensor->subdev);
> +		rows = ctrl->val;
> +		return et8ek8_i2c_write_reg(client, ET8EK8_REG_16BIT, 0x1243,
> +					    swab16(rows));

Why swab16()? Doesn't the et8ek8_i2c_write_reg() already do the right thing?

16-bit writes aren't used elsewhere... and the register address and value
seem to have different endianness there, it looks like a bug to me in that
function.

-- 
Regards,

Sakari Ailus
e-mail: sakari.ailus@....fi	XMPP: sailus@...iisi.org.uk