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SubjectRe: [PATCH v2 2/3] media: imx7-media-csi: add i.MX6UL support
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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@armadeus.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

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 = &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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