Subject: Re: [PATCH v2 2/3] media: imx7-media-csi: add i.MX6UL support

From: Rui Miguel Silva <[email-masked]>
Date: Mon, 10 Jun 2019 11:28:06 +0100

Hi Sebastien,
Thanks for the patch.

On Thu 06 Jun 2019 at 16:38, Sébastien Szymanski wrote:
> i.MX7 and i.MX6UL/L have the same CSI controller. So add i.MX6UL/L support
> to imx7-media-csi driver.
>
> Signed-off-by: Sébastien Szymanski <[email-masked]>
> ---
>
> Changes for v2:
>  - rebase on top of linuxtv/master
>  - mention i.MX6UL/L in header and Kconfig help text
>  - rename csi_type to csi_soc_id
>
>  drivers/staging/media/imx/Kconfig          |  4 +-
>  drivers/staging/media/imx/imx7-media-csi.c | 62 ++++++++++++++++------
>  2 files changed, 49 insertions(+), 17 deletions(-)
>
> diff --git a/drivers/staging/media/imx/Kconfig b/drivers/staging/media/imx/Kconfig
> index ad3d7df6bb3c..8b6dc42c39e0 100644
> --- a/drivers/staging/media/imx/Kconfig
> +++ b/drivers/staging/media/imx/Kconfig
> @@ -22,11 +22,11 @@ config VIDEO_IMX_CSI
>  	  A video4linux camera sensor interface driver for i.MX5/6.
>
>  config VIDEO_IMX7_CSI
> -	tristate "i.MX7 Camera Sensor Interface driver"
> +	tristate "i.MX6UL/L / i.MX7 Camera Sensor Interface driver"
>  	depends on VIDEO_IMX_MEDIA && VIDEO_DEV && I2C
>  	default y
>  	help
>  	  Enable support for video4linux camera sensor interface driver for
> -	  i.MX7.
> +	  i.MX6UL/L or i.MX7.
>  endmenu
>  endif
> diff --git a/drivers/staging/media/imx/imx7-media-csi.c b/drivers/staging/media/imx/imx7-media-csi.c
> index 9101566f3f67..902bdce594cf 100644
> --- a/drivers/staging/media/imx/imx7-media-csi.c
> +++ b/drivers/staging/media/imx/imx7-media-csi.c
> @@ -1,6 +1,6 @@
>  // SPDX-License-Identifier: GPL-2.0
>  /*
> - * V4L2 Capture CSI Subdev for Freescale i.MX7 SOC
> + * V4L2 Capture CSI Subdev for Freescale i.MX6UL/L / i.MX7 SOC
>   *
>   * Copyright (c) 2019 Linaro Ltd
>   *
> @@ -152,6 +152,11 @@
>  #define CSI_CSICR18		0x48
>  #define CSI_CSICR19		0x4c
>
> +enum csi_soc_id {
> +	IMX7,
> +	IMX6UL
> +};
> +
>  struct imx7_csi {
>  	struct device *dev;
>  	struct v4l2_subdev sd;
> @@ -191,6 +196,7 @@ struct imx7_csi {
>  	bool is_init;
>  	bool is_streaming;
>  	bool is_csi2;
> +	enum csi_soc_id soc_id;
>
>  	struct completion last_eof_completion;
>  };
> @@ -548,6 +554,14 @@ static int imx7_csi_pad_link_validate(struct v4l2_subdev *sd,
>  	if (ret)
>  		return ret;
>
> +	if (csi->soc_id == IMX6UL) {
> +		mutex_lock(&csi->lock);
> +		csi->is_csi2 = false;
> +		mutex_unlock(&csi->lock);
> +
> +		return 0;
> +	}
> +
>  	ret = imx7_csi_get_upstream_endpoint(csi, &upstream_ep, true);
>  	if (ret) {
>  		v4l2_err(&csi->sd, "failed to find upstream endpoint\n");
> @@ -757,6 +771,7 @@ static int imx7_csi_configure(struct imx7_csi *csi)
>  	struct v4l2_pix_format *out_pix = &vdev->fmt.fmt.pix;
>  	__u32 in_code = csi->format_mbus[IMX7_CSI_PAD_SINK].code;
>  	u32 cr1, cr18;
> +	int width = out_pix->width;
>
>  	if (out_pix->field == V4L2_FIELD_INTERLACED) {
>  		imx7_csi_deinterlace_enable(csi, true);
> @@ -766,15 +781,27 @@ static int imx7_csi_configure(struct imx7_csi *csi)
>  		imx7_csi_buf_stride_set(csi, 0);
>  	}
>
> -	imx7_csi_set_imagpara(csi, out_pix->width, out_pix->height);
> +	cr18 = imx7_csi_reg_read(csi, CSI_CSICR18);
> +
> +	if (!csi->is_csi2) {
> +		if (out_pix->pixelformat == V4L2_PIX_FMT_UYVY ||
> +		    out_pix->pixelformat == V4L2_PIX_FMT_YUYV)
> +			width *= 2;
> +
> +		imx7_csi_set_imagpara(csi, width, out_pix->height);
> +
> +		cr18 |= (BIT_BASEADDR_SWITCH_EN | BIT_BASEADDR_SWITCH_SEL |
> +			BIT_BASEADDR_CHG_ERR_EN);
> +		imx7_csi_reg_write(csi, cr18, CSI_CSICR18);
>
> -	if (!csi->is_csi2)
>  		return 0;
> +	}
> +
> +	imx7_csi_set_imagpara(csi, width, out_pix->height);
>
>  	cr1 = imx7_csi_reg_read(csi, CSI_CSICR1);
>  	cr1 &= ~BIT_GCLK_MODE;
>
> -	cr18 = imx7_csi_reg_read(csi, CSI_CSICR18);
>  	cr18 &= BIT_MIPI_DATA_FORMAT_MASK;
>  	cr18 |= BIT_DATA_FROM_MIPI;
>
> @@ -809,11 +836,9 @@ static void imx7_csi_enable(struct imx7_csi *csi)
>  {
>  	imx7_csi_sw_reset(csi);
>
> -	if (csi->is_csi2) {
> -		imx7_csi_dmareq_rff_enable(csi);
> -		imx7_csi_hw_enable_irq(csi);
> -		imx7_csi_hw_enable(csi);
> -	}
> +	imx7_csi_dmareq_rff_enable(csi);
> +	imx7_csi_hw_enable_irq(csi);
> +	imx7_csi_hw_enable(csi);
>  }
>
>  static void imx7_csi_disable(struct imx7_csi *csi)
> @@ -1166,19 +1191,32 @@ static int imx7_csi_parse_endpoint(struct device *dev,
>  	return fwnode_device_is_available(asd->match.fwnode) ? 0 : -EINVAL;
>  }
>
> +static const struct of_device_id imx7_csi_of_match[] = {
> +	{ .compatible = "fsl,imx7-csi", .data = (void *)IMX7 },
> +	{ .compatible = "fsl,imx6ul-csi", .data = (void *)IMX6UL },

looking at this again I think we can do this is a different way.
Instead data being the soc_id, just set here if it is_csi2 or not.

This would avoid to add a soc_id  to the struct that it really it
is used only to setup the is_csi2 var. I think this will make this
patch a lot simpler.

> +	{ },
> +};
> +MODULE_DEVICE_TABLE(of, imx7_csi_of_match);
> +
>  static int imx7_csi_probe(struct platform_device *pdev)
>  {
>  	struct device *dev = &pdev->dev;
>  	struct device_node *node = dev->of_node;
>  	struct imx_media_dev *imxmd;
>  	struct imx7_csi *csi;
> +	const struct of_device_id *of_id;
>  	int ret;
>
> +	of_id = of_match_node(imx7_csi_of_match, node);

With the above said, here I think we can use the of_match_device?

hope this makes sense also to you.

Once again thanks for the patches.

---
Cheers,
        Rui

> +	if (!of_id)
> +		return -ENODEV;
> +
>  	csi = devm_kzalloc(&pdev->dev, sizeof(*csi), GFP_KERNEL);
>  	if (!csi)
>  		return -ENOMEM;
>
>  	csi->dev = dev;
> +	csi->soc_id = (enum csi_soc_id)of_id->data;
>
>  	csi->mclk = devm_clk_get(&pdev->dev, "mclk");
>  	if (IS_ERR(csi->mclk)) {
> @@ -1294,12 +1332,6 @@ static int imx7_csi_remove(struct platform_device *pdev)
>  	return 0;
>  }
>
> -static const struct of_device_id imx7_csi_of_match[] = {
> -	{ .compatible = "fsl,imx7-csi" },
> -	{ },
> -};
> -MODULE_DEVICE_TABLE(of, imx7_csi_of_match);
> -
>  static struct platform_driver imx7_csi_driver = {
>  	.probe = imx7_csi_probe,
>  	.remove = imx7_csi_remove,

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