linux-kernel - Re: [PATCH 1/5] media: imx335: Support 2 or 4 lane operation modes

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Message-ID: <ZeiikZcVm0YZJKU0@kekkonen.localdomain>
Date: Wed, 6 Mar 2024 17:06:25 +0000
From: Sakari Ailus <sakari.ailus@...ux.intel.com>
To: Umang Jain <umang.jain@...asonboard.com>
Cc: linux-media@...r.kernel.org,
	Alexander Shiyan <eagle.alexander923@...il.com>,
	Kieran Bingham <kieran.bingham@...asonboard.com>,
	Mauro Carvalho Chehab <mchehab@...nel.org>,
	open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 1/5] media: imx335: Support 2 or 4 lane operation modes

Hi Umang,

On Wed, Mar 06, 2024 at 01:40:34PM +0530, Umang Jain wrote:
> From: Kieran Bingham <kieran.bingham@...asonboard.com>
> 
> 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@...asonboard.com>
> Signed-off-by: Umang Jain <umang.jain@...asonboard.com>
> ---
>  drivers/media/i2c/imx335.c | 46 +++++++++++++++++++++++++++++++-------
>  1 file changed, 38 insertions(+), 8 deletions(-)
> 
> diff --git a/drivers/media/i2c/imx335.c b/drivers/media/i2c/imx335.c
> index dab6d080bc4c..a42f48823515 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
>  
> @@ -67,8 +72,6 @@
>  #define IMX335_LINK_FREQ_594MHz		594000000LL
>  #define IMX335_LINK_FREQ_445MHz		445500000LL
>  
> -#define IMX335_NUM_DATA_LANES	4
> -
>  #define IMX335_REG_MIN		0x00
>  #define IMX335_REG_MAX		0xfffff
>  
> @@ -115,7 +118,6 @@ static const char * const imx335_supply_name[] = {
>   * @vblank: Vertical blanking in lines
>   * @vblank_min: Minimum vertical blanking in lines
>   * @vblank_max: Maximum vertical blanking in lines
> - * @pclk: Sensor pixel clock
>   * @reg_list: Register list for sensor mode
>   */
>  struct imx335_mode {
> @@ -126,7 +128,6 @@ struct imx335_mode {
>  	u32 vblank;
>  	u32 vblank_min;
>  	u32 vblank_max;
> -	u64 pclk;
>  	struct imx335_reg_list reg_list;
>  };
>  
> @@ -147,6 +148,7 @@ 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
> @@ -171,6 +173,7 @@ 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;
> @@ -377,7 +380,6 @@ static const struct imx335_mode supported_mode = {
>  	.vblank = 2560,
>  	.vblank_min = 2560,
>  	.vblank_max = 133060,
> -	.pclk = 396000000,
>  	.reg_list = {
>  		.num_of_regs = ARRAY_SIZE(mode_2592x1940_regs),
>  		.regs = mode_2592x1940_regs,
> @@ -936,6 +938,11 @@ 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) {
> @@ -1096,7 +1103,14 @@ 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);
> @@ -1209,6 +1223,9 @@ static int imx335_init_controls(struct imx335 *imx335)
>  	struct v4l2_ctrl_handler *ctrl_hdlr = &imx335->ctrl_handler;
>  	const struct imx335_mode *mode = imx335->cur_mode;
>  	u32 lpfr;
> +	u64 pclk;
> +	s64 link_freq_in_use;
> +	u8 bpp;
>  	int ret;
>  
>  	ret = v4l2_ctrl_handler_init(ctrl_hdlr, 7);
> @@ -1252,11 +1269,24 @@ static int imx335_init_controls(struct imx335 *imx335)
>  				     0, 0, imx335_tpg_menu);
>  
>  	/* Read only controls */
> +
> +	/* pixel rate = link frequency * lanes * 2 / bits_per_pixel */
> +	switch (imx335->cur_mbus_code) {
> +	case MEDIA_BUS_FMT_SRGGB10_1X10:
> +		bpp = 10;
> +		break;
> +	case MEDIA_BUS_FMT_SRGGB12_1X12:
> +		bpp = 12;
> +		break;
> +	}
> +
> +	link_freq_in_use = link_freq[__ffs(imx335->link_freq_bitmap)];
> +	pclk = link_freq_in_use * (imx335->lane_mode + 1) * 2 / bpp;

Please use div_s64() for this.

>  	imx335->pclk_ctrl = v4l2_ctrl_new_std(ctrl_hdlr,
>  					      &imx335_ctrl_ops,
>  					      V4L2_CID_PIXEL_RATE,
> -					      mode->pclk, mode->pclk,
> -					      1, mode->pclk);
> +					      pclk, pclk,
> +					      1, pclk);
>  
>  	imx335->link_freq_ctrl = v4l2_ctrl_new_int_menu(ctrl_hdlr,
>  							&imx335_ctrl_ops,

-- 
Regards,

Sakari Ailus