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Date: Mon, 10 Jun 2019 11:28:06 +0100
From: Rui Miguel Silva <rmfrfs@...il.com>
To: Sébastien Szymanski
<sebastien.szymanski@...adeus.com>
Cc: devel@...verdev.osuosl.org, linux-kernel@...r.kernel.org,
linux-arm-kernel@...ts.infradead.org, devicetree@...r.kernel.org,
linux-media@...r.kernel.org, Shawn Guo <shawnguo@...nel.org>,
Mauro Carvalho Chehab <mchehab@...nel.org>,
Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
Philipp Zabel <p.zabel@...gutronix.de>,
Steve Longerbeam <slongerbeam@...il.com>,
NXP Linux Team <linux-imx@....com>,
Fabio Estevam <festevam@...il.com>,
Pengutronix Kernel Team <kernel@...gutronix.de>,
Sascha Hauer <s.hauer@...gutronix.de>,
Mark Rutland <mark.rutland@....com>,
Rob Herring <robh+dt@...nel.org>
Subject: Re: [PATCH v2 2/3] media: imx7-media-csi: add i.MX6UL support
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 <sebastien.szymanski@...adeus.com>
> ---
>
> 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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