Re: [PATCH v2 1/6] media: imx335: Support 2 or 4 lane operation modes

[Tommaso Merciai]

Hi Umang,

On Fri, Mar 08, 2024 at 02:03:07PM +0530, Umang Jain wrote:
> From: Kieran Bingham <kieran.bingham@xxxxxxxxxxxxxxxx>
> 
> The IMX335 can support both 2 and 4 lane configurations.
> Extend the driver to configure the lane mode accordingly.
> Update the pixel rate depending on the number of lanes in use.
> 
> Signed-off-by: Kieran Bingham <kieran.bingham@xxxxxxxxxxxxxxxx>
> Signed-off-by: Umang Jain <umang.jain@xxxxxxxxxxxxxxxx>
> ---
>  drivers/media/i2c/imx335.c | 21 ++++++++++++++++++++-
>  1 file changed, 20 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/media/i2c/imx335.c b/drivers/media/i2c/imx335.c
> index b47ec71054c3..7162b0a3cef3 100644
> --- a/drivers/media/i2c/imx335.c
> +++ b/drivers/media/i2c/imx335.c
> @@ -21,6 +21,11 @@
>  #define IMX335_MODE_STANDBY	0x01
>  #define IMX335_MODE_STREAMING	0x00
>  
> +/* Data Lanes */
> +#define IMX335_LANEMODE		0x3a01
> +#define IMX335_2LANE		1
> +#define IMX335_4LANE		3
> +
>  /* Lines per frame */
>  #define IMX335_REG_LPFR		0x3030
>  
> @@ -145,6 +150,7 @@ struct imx335_mode {
>   * @exp_ctrl: Pointer to exposure control
>   * @again_ctrl: Pointer to analog gain control
>   * @vblank: Vertical blanking in lines
> + * @lane_mode Mode for number of connected data lanes
>   * @cur_mode: Pointer to current selected sensor mode
>   * @mutex: Mutex for serializing sensor controls
>   * @link_freq_bitmap: Menu bitmap for link_freq_ctrl
> @@ -169,6 +175,7 @@ struct imx335 {
>  		struct v4l2_ctrl *again_ctrl;
>  	};
>  	u32 vblank;
> +	u32 lane_mode;
>  	const struct imx335_mode *cur_mode;
>  	struct mutex mutex;
>  	unsigned long link_freq_bitmap;
> @@ -934,6 +941,11 @@ static int imx335_start_streaming(struct imx335 *imx335)
>  		return ret;
>  	}
>  
> +	/* Configure lanes */
> +	ret = imx335_write_reg(imx335, IMX335_LANEMODE, 1, imx335->lane_mode);
> +	if (ret)
> +		return ret;
> +
>  	/* Setup handler will write actual exposure and gain */
>  	ret =  __v4l2_ctrl_handler_setup(imx335->sd.ctrl_handler);
>  	if (ret) {
> @@ -1094,7 +1106,14 @@ static int imx335_parse_hw_config(struct imx335 *imx335)
>  	if (ret)
>  		return ret;
>  
> -	if (bus_cfg.bus.mipi_csi2.num_data_lanes != IMX335_NUM_DATA_LANES) {
> +	switch (bus_cfg.bus.mipi_csi2.num_data_lanes) {
> +	case 2:
> +		imx335->lane_mode = IMX335_2LANE;
> +		break;
> +	case 4:
> +		imx335->lane_mode = IMX335_4LANE;
> +		break;
> +	default:
>  		dev_err(imx335->dev,
>  			"number of CSI2 data lanes %d is not supported\n",
>  			bus_cfg.bus.mipi_csi2.num_data_lanes);


Looks good to me.

Similar on what we have on imx219 drv:
ret = imx219_configure_lanes(imx219);

Reviewed-by: Tommaso Merciai <tomm.merciai@xxxxxxxxx>

Thanks & Regards,
Tommaso

> -- 
> 2.43.0
> 
>