linux-kernel - Re: [PATCH v2 07/13] media: i2c: imx214: Check number of lanes from device tree

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Message-ID: <CAPybu_28VXjfJksVccfvytB9PU2-saNpAos8sBtQnhgt8KKz2w@mail.gmail.com>
Date: Wed, 30 Oct 2024 12:38:59 +0100
From: Ricardo Ribalda Delgado <ribalda@...nel.org>
To: git@...tzsch.eu
Cc: Mauro Carvalho Chehab <mchehab@...nel.org>, Sakari Ailus <sakari.ailus@...ux.intel.com>, 
	~postmarketos/upstreaming@...ts.sr.ht, phone-devel@...r.kernel.org, 
	linux-media@...r.kernel.org, linux-kernel@...r.kernel.org, 
	Dave Stevenson <dave.stevenson@...pberrypi.com>
Subject: Re: [PATCH v2 07/13] media: i2c: imx214: Check number of lanes from
 device tree

On Mon, Oct 21, 2024 at 12:14 AM André Apitzsch via B4 Relay
<devnull+git.apitzsch.eu@...nel.org> wrote:
>
> From: André Apitzsch <git@...tzsch.eu>
>
> The imx214 camera is capable of either two-lane or four-lane operation.
>
> Currently only the four-lane mode is supported, as proper pixel rates
> and link frequences for the two-lane mode are unknown.
>
> Signed-off-by: André Apitzsch <git@...tzsch.eu>
> ---
>  drivers/media/i2c/imx214.c | 26 +++++++++++++++++++-------
>  1 file changed, 19 insertions(+), 7 deletions(-)
>
> diff --git a/drivers/media/i2c/imx214.c b/drivers/media/i2c/imx214.c
> index 0c83149bcc3e3b833a087d26104eb7dfaafdf904..497baad616ad7374a92a3da2b7c1096b1d72a0c7 100644
> --- a/drivers/media/i2c/imx214.c
> +++ b/drivers/media/i2c/imx214.c
> @@ -199,7 +199,6 @@ struct imx214 {
>
>  /*From imx214_mode_tbls.h*/
>  static const struct cci_reg_sequence mode_4096x2304[] = {
> -       { IMX214_REG_CSI_LANE_MODE, IMX214_CSI_4_LANE_MODE },
>         { IMX214_REG_HDR_MODE, IMX214_HDR_MODE_OFF },
>         { IMX214_REG_HDR_RES_REDUCTION, IMX214_HDR_RES_REDU_THROUGH },
>         { IMX214_REG_EXPOSURE_RATIO, 1 },
> @@ -272,7 +271,6 @@ static const struct cci_reg_sequence mode_4096x2304[] = {
>  };
>
>  static const struct cci_reg_sequence mode_1920x1080[] = {
> -       { IMX214_REG_CSI_LANE_MODE, IMX214_CSI_4_LANE_MODE },
>         { IMX214_REG_HDR_MODE, IMX214_HDR_MODE_OFF },
>         { IMX214_REG_HDR_RES_REDUCTION, IMX214_HDR_RES_REDU_THROUGH },
>         { IMX214_REG_EXPOSURE_RATIO, 1 },
> @@ -791,6 +789,13 @@ static int imx214_start_streaming(struct imx214 *imx214)
>                 return ret;
>         }
>
> +       ret = cci_write(imx214->regmap, IMX214_REG_CSI_LANE_MODE,
> +                       IMX214_CSI_4_LANE_MODE, NULL);
> +       if (ret) {
> +               dev_err(imx214->dev, "%s failed to configure lanes\n", __func__);
> +               return ret;
> +       }
> +
>         ret = cci_multi_reg_write(imx214->regmap, imx214->cur_mode->reg_table,
>                                   imx214->cur_mode->num_of_regs, NULL);
>         if (ret < 0) {
> @@ -932,7 +937,7 @@ static int imx214_get_regulators(struct device *dev, struct imx214 *imx214)
>                                        imx214->supplies);
>  }
>
> -static int imx214_parse_fwnode(struct device *dev)
> +static int imx214_parse_fwnode(struct device *dev, struct imx214 *imx214)
We don't seem to use imx214 in the function. You probably do not want
to add this change.
>  {
>         struct fwnode_handle *endpoint;
>         struct v4l2_fwnode_endpoint bus_cfg = {
> @@ -951,6 +956,13 @@ static int imx214_parse_fwnode(struct device *dev)
>                 goto done;
>         }
>
> +       /* Check the number of MIPI CSI2 data lanes */
> +       if (bus_cfg.bus.mipi_csi2.num_data_lanes != 4) {
> +               dev_err_probe(dev, -EINVAL,
> +                             "only 4 data lanes are currently supported\n");
> +               goto done;
> +       }
> +
>         for (i = 0; i < bus_cfg.nr_of_link_frequencies; i++)
>                 if (bus_cfg.link_frequencies[i] == IMX214_DEFAULT_LINK_FREQ)
>                         break;
> @@ -975,14 +987,14 @@ static int imx214_probe(struct i2c_client *client)
>         struct imx214 *imx214;
>         int ret;
>
> -       ret = imx214_parse_fwnode(dev);
> -       if (ret)
> -               return ret;
> -
>         imx214 = devm_kzalloc(dev, sizeof(*imx214), GFP_KERNEL);
>         if (!imx214)
>                 return -ENOMEM;
>
> +       ret = imx214_parse_fwnode(dev, imx214);
> +       if (ret)
> +               return ret;
I  am not against changing the order... but the commit message does
not mention it.

> +
>         imx214->dev = dev;
>
>         imx214->xclk = devm_clk_get(dev, NULL);
>
> --
> 2.47.0
>
>