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imx6q MIPI CSI  dphy_status = 0x2f0

Question asked by an nguyen on Nov 2, 2015
Latest reply on Nov 9, 2015 by an nguyen

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 ( ), 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!!!



Please see attach file for OV5640 PLL diagram