imx6q MIPI CSI dphy_status = 0x2f0

[annguyen]

Hi all,

I have modified ov5640_mipi.c to support my camera sensor, ov4188. I2C communication works fine to read/write sensor register or control power, etc,..

In .dtsi file:

ipu_id = <0>;

csi_id = <1>;

v_channel = <0>;

lanes = <4>;

Linux kernel 3.10.53

However, MIPI_CSI_PHY_STATE is always 0x2f0 and when querying frame, it returns

"ERROR: v4l2 capture: mxc_v4l_dqueue timeout enc_counter 0"

I tried all dphy clock range in Debug steps for customer MIPI sensor.docx ( https://community.freescale.com/docs/DOC-94312#comment-29669​ ), but no help. I also adjust PLL settings of the camera sensor to attain a good clock range as the Debug document, but it's still not correct.

After that, I found ov5640 datasheet to calculate mipi clk. It's 56Mhz, not 849Mhz.

Register address          value

0x3037                         0x13

0x3036                         0x38

0x3035                         0x14

0x3108                         0x01

So, I am very curious about how to calculate ov5640 output clk to map 0x00000014 to csi2 as the following line:

mipi_csi2_write(info, 0x00000014, CSI2_PHY_TST_CTRL1);//ov5640 output clk

Can anyone show me how to calculate mipi dphy clk correctly? And what's problem with mipi_phy_state?

Thank you very much!!!

P/S:

Please see attach file for OV5640 PLL diagram

MIPI_CSI_PHY_STATE

[johannobermayr]

yes, also search how to calculate Register 3035, 3036 for ov5640 camera.

step 1) camera should be send RGB888 direct to mem

step 2) camera should be sende RGB with 10bit/Color  direct to Memory with convert 3x10bit into 32bit Memory

regards

  Johann

[annguyen]

Hi Johann,

Thank you very much for your interest!

I am not clear with your meaning when you mention "also search how to calculate Register 3035, 3036 for ov5640 camera". I listed register values of those in previous post.

Register address          value

0x3037                         0x13

0x3036                         0x38

0x3035                         0x14

0x3108                         0x01

Do you know why 0x00000014, corresponding to 800-850 Mhz, is CSI2_PHY_TST_CTRL1?

Best regards,

An.

[johannobermayr]

Hello nguyen,

Thanks for helping.

we are testing different fps, Resolution, 8/10bit, ...

and after change on of this parameter, 3035, 3036 must be configured.

But with which values ?

Is there a formula for this ?

What we need is a picture in our memory with RGB with 10bit/Color in VGA resolution.

it can be, that we Need the next better resolution.

Memory Format:

a) every color have 10bit and 6 empty bits. (1 RGB Pixel have 6Bytes)

b) one Pixel in a 4Byte value with R10 G10 B10 and 2 empty bits.

I've read that the ImageConverter in the IPU does not Support 10bit/value, so i thing the best way is write

the needed value from sensor direct into memory.

Regards

  Johann

[annguyen]

Johann,

I am stuck with similar case, so that I made this post. Let's look for some answer from others.

Best regards,

An.