Re: [PATCH v2 1/3] media: i2c: imx471: Add line length PCK setting

[Sakari Ailus]

Hi Kate,

On Fri, Sep 04, 2026 at 03:51:11PM +0800, Kate Hsuan wrote:
> Add the line length PCK setting to the IMX471 driver. This parameter
> determines the horizontal line scan duration and is used to calculate
> and control the sensor frame rate.
> Set the line length PCK value to 0x0a00 (matching the original value
> in ipu6-drivers), which maintains a frame rate close to the datasheet
> spec (~150 FPS in 2328x1304 binning mode).

This fits on fewer lines, please rewrap.

> 
> Signed-off-by: Kate Hsuan <hpa@xxxxxxxxxx>
> ---
>  drivers/media/i2c/imx471.c | 2 ++
>  1 file changed, 2 insertions(+)
> 
> diff --git a/drivers/media/i2c/imx471.c b/drivers/media/i2c/imx471.c
> index 4053aed84340..3c939f2a9056 100644
> --- a/drivers/media/i2c/imx471.c
> +++ b/drivers/media/i2c/imx471.c
> @@ -91,6 +91,7 @@
>  #define IMX471_CSI_2_LANE_MODE			1
>  #define IMX471_CSI_4_LANE_MODE			3
>  
> +#define IMX471_REG_LINE_LENGTH_PCK		CCI_REG16(0x0342)
>  #define IMX471_REG_X_ADD_STA			CCI_REG16(0x0344)
>  #define IMX471_REG_Y_ADD_STA			CCI_REG16(0x0346)
>  #define IMX471_REG_X_ADD_END			CCI_REG16(0x0348)
> @@ -240,6 +241,7 @@ static const struct cci_reg_sequence mode_1928x1088_regs[] = {
>  	{ CCI_REG8(0x030d), 0x02 },
>  	{ CCI_REG8(0x030e), 0x00 },
>  	{ CCI_REG8(0x030f), 0x53 },
> +	{ IMX471_REG_LINE_LENGTH_PCK, 2560 },

The register definition is nice but there's already a control for this.
Could you do this via s_ctrl()?

There's also another set addressing related issues here
<URL:https://lore.kernel.org/linux-media/20260904075113.125751-1-hpa@xxxxxxxxxx/T/#t>.

>  	{ IMX471_REG_PLL_MULT_DRIV, IMX471_PLL_DUAL },
>  	{ CCI_REG8(0x3f4c), 0x81 },
>  	{ CCI_REG8(0x3f4d), 0x81 },

-- 
Regards,

Sakari Ailus