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Date: Tue, 11 Jun 2019 12:03:20 +0200
From: Sébastien Szymanski
<sebastien.szymanski@...adeus.com>
To: Rui Miguel Silva <rmfrfs@...il.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
On 6/11/19 11:40 AM, Rui Miguel Silva wrote:
> Hi Sebastien,
> On Tue 11 Jun 2019 at 09:16, Sébastien 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, 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.
>>
>> 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).
I actually do, in the device tree of my board I have:
&csi {
pinctrl-names = "default";
pinctrl-0 = <&pinctrl_csi>;
status = "okay";
port {
csi_ep: endpoint {
remote-endpoint = <&ov5640_ep>;
bus-type = <5>; // V4L2_FWNODE_BUS_TYPE_PARALLEL
};
};
};
and
&i2c2 {
..
ov5640: camera@3c {
...
port {
ov5640_ep: endpoint {
remote-endpoint = <&csi_ep>;
bus-width = <8>;
data-shift = <2>; /* lines 9:2 are used */
hsync-active = <0>;
vsync-active = <1>;
pclk-sample = <0>;
};
};
};
};
Regards,
>
> ---
> 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@...0 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 = &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,
>>>
>
--
Sébastien Szymanski
Software engineer, Armadeus Systems
Tel: +33 (0)9 72 29 41 44
Fax: +33 (0)9 72 28 79 26
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