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References: <20190606153825.8183-1-sebastien.szymanski@armadeus.com> <20190606153825.8183-2-sebastien.szymanski@armadeus.com> <m34l4xpweh.fsf@gmail.com> <722336d1-c7f7-1796-95d5-7bba1fac7968@armadeus.com>
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From:   Rui Miguel Silva <rmfrfs@gmail.com>
To:     =?utf-8?Q?S=C3=A9bastien?= Szymanski 
        <sebastien.szymanski@armadeus.com>
Cc:     devel@driverdev.osuosl.org, linux-kernel@vger.kernel.org,
        linux-arm-kernel@lists.infradead.org, devicetree@vger.kernel.org,
        linux-media@vger.kernel.org, Shawn Guo <shawnguo@kernel.org>,
        Mauro Carvalho Chehab <mchehab@kernel.org>,
        Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        Philipp Zabel <p.zabel@pengutronix.de>,
        Steve Longerbeam <slongerbeam@gmail.com>,
        NXP Linux Team <linux-imx@nxp.com>,
        Fabio Estevam <festevam@gmail.com>,
        Pengutronix Kernel Team <kernel@pengutronix.de>,
        Sascha Hauer <s.hauer@pengutronix.de>,
        Mark Rutland <mark.rutland@arm.com>,
        Rob Herring <robh+dt@kernel.org>
Subject: Re: [PATCH v2 2/3] media: imx7-media-csi: add i.MX6UL support
In-reply-to: <722336d1-c7f7-1796-95d5-7bba1fac7968@armadeus.com>
Date:   Tue, 11 Jun 2019 10:40:22 +0100
Message-ID: <m3zhmo1mux.fsf@gmail.com>
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Sender: linux-kernel-owner@vger.kernel.org
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Hi Sebastien,
On Tue 11 Jun 2019 at 09:16, S=C3=A9bastien Szymanski wrote:
> Hi Rui,
>
> thanks for the review!
>
> On 6/10/19 12:28 PM, Rui Miguel Silva wrote:
>> Hi Sebastien,
>> Thanks for the patch.
>>
>> On Thu 06 Jun 2019 at 16:38, S=C3=A9bastien Szymanski wrote:
>>> i.MX7 and i.MX6UL/L have the same CSI controller. So add i.MX6UL/L supp=
ort
>>> to imx7-media-csi driver.
>>>
>>> Signed-off-by: S=C3=A9bastien Szymanski <sebastien.szymanski@armadeus.c=
om>
>>> ---
>>>
>>> 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/stagi=
ng/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 =3D=3D IMX6UL) {
>>> +		mutex_lock(&csi->lock);
>>> +		csi->is_csi2 =3D false;
>>> +		mutex_unlock(&csi->lock);
>>> +
>>> +		return 0;
>>> +	}
>>> +
>>>  	ret =3D 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 =3D &vdev->fmt.fmt.pix;
>>>  	__u32 in_code =3D csi->format_mbus[IMX7_CSI_PAD_SINK].code;
>>>  	u32 cr1, cr18;
>>> +	int width =3D out_pix->width;
>>>
>>>  	if (out_pix->field =3D=3D V4L2_FIELD_INTERLACED) {
>>>  		imx7_csi_deinterlace_enable(csi, true);
>>> @@ -766,15 +781,27 @@ static int imx7_csi_configure(struct imx7_csi *cs=
i)
>>>  		imx7_csi_buf_stride_set(csi, 0);
>>>  	}
>>>
>>> -	imx7_csi_set_imagpara(csi, out_pix->width, out_pix->height);
>>> +	cr18 =3D imx7_csi_reg_read(csi, CSI_CSICR18);
>>> +
>>> +	if (!csi->is_csi2) {
>>> +		if (out_pix->pixelformat =3D=3D V4L2_PIX_FMT_UYVY ||
>>> +		    out_pix->pixelformat =3D=3D V4L2_PIX_FMT_YUYV)
>>> +			width *=3D 2;
>>> +
>>> +		imx7_csi_set_imagpara(csi, width, out_pix->height);
>>> +
>>> +		cr18 |=3D (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 =3D imx7_csi_reg_read(csi, CSI_CSICR1);
>>>  	cr1 &=3D ~BIT_GCLK_MODE;
>>>
>>> -	cr18 =3D imx7_csi_reg_read(csi, CSI_CSICR18);
>>>  	cr18 &=3D BIT_MIPI_DATA_FORMAT_MASK;
>>>  	cr18 |=3D 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 devic=
e *dev,
>>>  	return fwnode_device_is_available(asd->match.fwnode) ? 0 : -EINVAL;
>>>  }
>>>
>>> +static const struct of_device_id imx7_csi_of_match[] =3D {
>>> +	{ .compatible =3D "fsl,imx7-csi", .data =3D (void *)IMX7 },
>>> +	{ .compatible =3D "fsl,imx6ul-csi", .data =3D (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.
>
> Well, I have added this soc_id because imx7_csi_get_upstream_endpoint in
> imx7_csi_pad_link_validate fails:
>
> [  366.549768] csi: failed to find upstream endpoint
> [  366.556274] csi: pipeline start failed with -19
>

I think this fails because you do not define any endpoint for the
csi in your board dts file. I see in patch 1/3 the setup of csi,
disabled, but not the endpoint connecting csi with the ov5640 in
your board file (see the connection between mipi imx7 and ov2680
in the imx7-warp.dts, or the ov5640.txt file).

---
Cheers,
        Rui


>
> My pipeline is:
>
> Device topology
> - entity 1: csi (2 pads, 2 links)
>             type V4L2 subdev subtype Unknown flags 0
>             device node name /dev/v4l-subdev0
>         pad0: Sink
>                 [fmt:UYVY8_2X8/640x480 field:none colorspace:srgb
> xfer:srgb ycbcr:601 quantization:full-range]
>                 <- "ov5640 1-003c":0 [ENABLED]
>         pad1: Source
>                 [fmt:UYVY8_2X8/640x480 field:none colorspace:srgb
> xfer:srgb ycbcr:601 quantization:full-range]
>                 -> "csi capture":0 [ENABLED]
>
> - entity 4: csi capture (1 pad, 1 link)
>             type Node subtype V4L flags 0
>             device node name /dev/video1
>         pad0: Sink
>                 <- "csi":1 [ENABLED]
>
> - entity 10: ov5640 1-003c (1 pad, 1 link)
>              type V4L2 subdev subtype Sensor flags 0
>              device node name /dev/v4l-subdev1
>         pad0: Source
>                 [fmt:UYVY8_2X8/640x480@1/30 field:none colorspace:srgb
> xfer:srgb ycbcr:601 quantization:full-range]
>                 -> "csi":0 [ENABLED]
>
>
> Maybe we should fix this ?
>
> Regards,
>
>>
>>> +	{ },
>>> +};
>>> +MODULE_DEVICE_TABLE(of, imx7_csi_of_match);
>>> +
>>>  static int imx7_csi_probe(struct platform_device *pdev)
>>>  {
>>>  	struct device *dev =3D &pdev->dev;
>>>  	struct device_node *node =3D dev->of_node;
>>>  	struct imx_media_dev *imxmd;
>>>  	struct imx7_csi *csi;
>>> +	const struct of_device_id *of_id;
>>>  	int ret;
>>>
>>> +	of_id =3D 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 =3D devm_kzalloc(&pdev->dev, sizeof(*csi), GFP_KERNEL);
>>>  	if (!csi)
>>>  		return -ENOMEM;
>>>
>>>  	csi->dev =3D dev;
>>> +	csi->soc_id =3D (enum csi_soc_id)of_id->data;
>>>
>>>  	csi->mclk =3D devm_clk_get(&pdev->dev, "mclk");
>>>  	if (IS_ERR(csi->mclk)) {
>>> @@ -1294,12 +1332,6 @@ static int imx7_csi_remove(struct platform_devic=
e *pdev)
>>>  	return 0;
>>>  }
>>>
>>> -static const struct of_device_id imx7_csi_of_match[] =3D {
>>> -	{ .compatible =3D "fsl,imx7-csi" },
>>> -	{ },
>>> -};
>>> -MODULE_DEVICE_TABLE(of, imx7_csi_of_match);
>>> -
>>>  static struct platform_driver imx7_csi_driver =3D {
>>>  	.probe =3D imx7_csi_probe,
>>>  	.remove =3D imx7_csi_remove,
>>