linux-kernel - Re: [PATCH v5 3/4] media: imx-mipi-csis: Add num_data_lanes to mipi_csis

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Message-ID: <aPjxZNIqDHHkZH+O@lizhi-Precision-Tower-5810>
Date: Wed, 22 Oct 2025 10:59:48 -0400
From: Frank Li <Frank.li@....com>
To: Isaac Scott <isaac.scott@...asonboard.com>
Cc: mchehab@...nel.org, rmfrfs@...il.com, laurent.pinchart@...asonboard.com,
	martink@...teo.de, kernel@...i.sm, shawnguo@...nel.org,
	s.hauer@...gutronix.de, kernel@...gutronix.de, festevam@...il.com,
	sakari.ailus@...ux.intel.com, linux-media@...r.kernel.org,
	linux-kernel@...r.kernel.org, imx@...ts.linux.dev,
	linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH v5 3/4] media: imx-mipi-csis: Add num_data_lanes to
 mipi_csis_device

On Wed, Oct 22, 2025 at 11:22:27AM +0100, Isaac Scott wrote:
> Add the num_data_lanes field to the mipi_csis_device struct, and set it
> equal to csis->bus.num_data_lanes. This is in preparation to support
> cases when the data lanes actively used differs from the maximum
> supported data lanes.
>
> No functional changes intended by this commit.
>
> Signed-off-by: Isaac Scott <isaac.scott@...asonboard.com>

Reviewed-by: Frank Li <Frank.Li@....com>

> ---
>  drivers/media/platform/nxp/imx-mipi-csis.c | 11 +++++++----
>  1 file changed, 7 insertions(+), 4 deletions(-)
>
> diff --git a/drivers/media/platform/nxp/imx-mipi-csis.c b/drivers/media/platform/nxp/imx-mipi-csis.c
> index 7c2a679dca2e..838a1ad123b5 100644
> --- a/drivers/media/platform/nxp/imx-mipi-csis.c
> +++ b/drivers/media/platform/nxp/imx-mipi-csis.c
> @@ -351,6 +351,8 @@ struct mipi_csis_device {
>  	u32 hs_settle;
>  	u32 clk_settle;
>
> +	unsigned int num_data_lanes;
> +
>  	spinlock_t slock;	/* Protect events */
>  	struct mipi_csis_event events[MIPI_CSIS_NUM_EVENTS];
>  	struct dentry *debugfs_root;
> @@ -573,7 +575,7 @@ static void mipi_csis_system_enable(struct mipi_csis_device *csis, int on)
>  	val = mipi_csis_read(csis, MIPI_CSIS_DPHY_CMN_CTRL);
>  	val &= ~MIPI_CSIS_DPHY_CMN_CTRL_ENABLE;
>  	if (on) {
> -		mask = (1 << (csis->bus.num_data_lanes + 1)) - 1;
> +		mask = (1 << (csis->num_data_lanes + 1)) - 1;
>  		val |= (mask & MIPI_CSIS_DPHY_CMN_CTRL_ENABLE);
>  	}
>  	mipi_csis_write(csis, MIPI_CSIS_DPHY_CMN_CTRL, val);
> @@ -623,7 +625,7 @@ static int mipi_csis_calculate_params(struct mipi_csis_device *csis,
>
>  	/* Calculate the line rate from the pixel rate. */
>  	link_freq = v4l2_get_link_freq(csis->source.pad, csis_fmt->width,
> -				       csis->bus.num_data_lanes * 2);
> +				       csis->num_data_lanes * 2);
>  	if (link_freq < 0) {
>  		dev_err(csis->dev, "Unable to obtain link frequency: %d\n",
>  			(int)link_freq);
> @@ -668,7 +670,7 @@ static void mipi_csis_set_params(struct mipi_csis_device *csis,
>  				 const struct v4l2_mbus_framefmt *format,
>  				 const struct csis_pix_format *csis_fmt)
>  {
> -	int lanes = csis->bus.num_data_lanes;
> +	int lanes = csis->num_data_lanes;
>  	u32 val;
>
>  	val = mipi_csis_read(csis, MIPI_CSIS_CMN_CTRL);
> @@ -1366,8 +1368,9 @@ static int mipi_csis_async_register(struct mipi_csis_device *csis)
>  	}
>
>  	csis->bus = vep.bus.mipi_csi2;
> +	csis->num_data_lanes = csis->bus.num_data_lanes;
>
> -	dev_dbg(csis->dev, "data lanes: %d\n", csis->bus.num_data_lanes);
> +	dev_dbg(csis->dev, "max data lanes: %d\n", csis->bus.num_data_lanes);
>  	dev_dbg(csis->dev, "flags: 0x%08x\n", csis->bus.flags);
>
>  	asd = v4l2_async_nf_add_fwnode_remote(&csis->notifier, ep,
> --
> 2.43.0
>