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Date: Tue, 11 Jun 2019 10:40:22 +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,
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).
---
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,
>>
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