i.MX ProcessorsのトピックRe: Getting an 'err_id_vc0' error on iMX6 MIPI-CSI

Getting an 'err_id_vc0' error on iMX6 MIPI-CSI

erezsteinberg — Tue, 11 Nov 2014 20:53:16 GMT

Hello experts,

I'm working on a device driver for a Sony IMX208 MIPI Image Sensor for the iMX6 on Linux 3.0.35.

My MIPI is set up as follows:

mipi_csi2_info:

mipi_csi2_info.mipi_en = 1

mipi_csi2_info.ipu_id = 0

mipi_csi2_info.csi_id = 0

mipi_csi2_info.v_channel = 0

mipi_csi2_info.lanes = 1

mipi_csi2_info.datatype = 0x2b (RAW10)

I am able to communicate with the sensor over I2C and everything seems to be working. However, starting the stream and waiting for buffers (using select()), no buffers are available. I have 'DEBUG' enabled for the drivers; the log I get is:

In MVC:mxc_streamon

YUYV

In MVC:mxc_poll

In MVC:mxc_v4l_ioctl

In MVC: mxc_v4l_do_ioctl c0445611

case VIDIOC_DQBUF

In MVC:mxc_v4l_dqueue

ERROR: v4l2 capture: mxc_v4l_dqueue() interrupt received

fps=In MVC:mxc_v4l_ioctl

If I check the CSI-MIPI Error registers, I see an err_id_vc0 in MIPI_CSI_ERR2 ("Unrecognized or unimplemented data type detected in Virtual Channel 0"). I tried both RAW8 and RAW10 formats, and I get the same error. According to MIPI-CSI2 Specs, this would be an "Unrecognized ID, caused by the presence of an unimplemented or unrecognized ID in the header", and the proposed receiver behavior "to indicate that the data packet is unidentified and cannot be unpacked by the receiver". So, my guess is that the MIPI-CSI2 hardware detects an error and doesn't forward any data, and that's why dqbuf fails.

But -- I don't understand why this error is happening!

Does anyone know of possible reasons for such an error to occur?

Any recommendations how to debug this issue?

Regards,

Erez

Re: Getting an 'err_id_vc0' error on iMX6 MIPI-CSI

allencao — Wed, 12 Nov 2014 07:39:33 GMT

Hi Erez,

It seems you set wrong data type of MIPI-CSI2 (something like: mipi_csi2_set_datatype(mipi_csi2_info, MIPI_DT_RGB888);

Please provide a detailed DS & AN of IMX208, thanks!

B.R.

Allen Cao

Re: Getting an 'err_id_vc0' error on iMX6 MIPI-CSI

erezsteinberg — Wed, 12 Nov 2014 07:51:47 GMT

Hi Allen,

I set MIPI_DT_RAW8 and MIPI_DT_RAW10, and I can see the correct value in mipi_csi2_info.datatype = 0x2b.

Besides, I looked at the source for mipi_csi2_set_datatype(), and it doesn't seem to actually do anything with the type. Also, I couldn't find any registers in iMX6 that can be configured for different data types.

I cannot provide DS for IMX208 (It's under NDA).

I will say that:

(1) the IMX208 spec says the 'Data Identifier' is made of 2-bit virtual channel + 6 bits Data types

(2) Virtual Channel is configurable (set to 0 in my case)

(3) Data types generated by IMX208 are:

6'h00 FRAME START CODE

6'h01 FRANE END CODE

6'h10 Null (Invalid data / dummy data)

6'h12 Embedded Data (not transmitted by default)

6'h13 OPB Data

6'h2a RAW8

6'h2b RAW10

Regards,

Erez

Re: Getting an 'err_id_vc0' error on iMX6 MIPI-CSI

allencao — Wed, 12 Nov 2014 08:26:41 GMT

Hi E,

Pls dump all the MIPI-CSI2 registers, thanks!

BTW, can you share your driver code, only MIPI-CSI2 part is OK?

B.R.

Allen Cao

Re: Re: Getting an 'err_id_vc0' error on iMX6 MIPI-CSI

erezsteinberg — Wed, 12 Nov 2014 08:35:55 GMT

Hi Allen,

Thanks for looking into this problem.

I attached the driver source code.

Here are the registers. PHY_STATE is not stable and changes between values 0x310 0x610 0x300

[root@erez]# devmem 0x21dc000

0x3130302A

[root@erez]# devmem 0x21dc004

0x00000000

[root@erez]# devmem 0x21dc008

0x00000001

[root@erez]# devmem 0x21dc00c

0x00000001

[root@erez]# devmem 0x21dc010

0x00000001

[root@erez]# devmem 0x21dc014

0x00000310

[root@erez]# devmem 0x21dc018

0x00000000

[root@erez]# devmem 0x21dc020

0x00000000

[root@erez]# devmem 0x21dc024

0x00001000

[root@erez]# devmem 0x21dc02c

0x00000000

[root@erez]# devmem 0x21dc030

0x00000000

[root@erez]# devmem 0x21dc034

0x00001414

Re: Re: Re: Getting an 'err_id_vc0' error on iMX6 MIPI-CSI

allencao — Wed, 12 Nov 2014 08:52:28 GMT

Hi E,

There are some errs @ D-PHY Level. Please refer the following link to check your MIPI-CSI2 config:

Debug steps for customer MIPI sensor.docx

Please pay attention to the "Check the clock setting" section.

B.R.

Allen Cao

Re: Re: Getting an 'err_id_vc0' error on iMX6 MIPI-CSI

erezsteinberg — Wed, 12 Nov 2014 09:12:47 GMT

Hi -

How do you see there are errs @ D-PHY Level?

The IMX208 sensor for Raw10, MIPI 1 Lane, 30 fps has a Data Rate of 405 Mbps/Lane.

However, I configures the IMX208 MIPI Global Timing to 780 .. 900 MHz.

If I set MIPI Global Timing to 400 .. 460 I get a lot of errors on the CSI2 error registers.

Should I also change mipi_csi2_reset() in mxc_mipi_csi2.c ?

Currently it has:

	mipi_csi2_write(info, 0x00000001, CSI2_PHY_TST_CTRL0);
	mipi_csi2_write(info, 0x00000000, CSI2_PHY_TST_CTRL1);
	mipi_csi2_write(info, 0x00000000, CSI2_PHY_TST_CTRL0);
	mipi_csi2_write(info, 0x00000002, CSI2_PHY_TST_CTRL0);
	mipi_csi2_write(info, 0x00010044, CSI2_PHY_TST_CTRL1);
	mipi_csi2_write(info, 0x00000000, CSI2_PHY_TST_CTRL0);
	mipi_csi2_write(info, 0x00000014, CSI2_PHY_TST_CTRL1);
	mipi_csi2_write(info, 0x00000002, CSI2_PHY_TST_CTRL0);
	mipi_csi2_write(info, 0x00000000, CSI2_PHY_TST_CTRL0);

Should I just change the 0x00000014 to 0x0000000c ?

Regards,

Erez

Re: Re: Getting an 'err_id_vc0' error on iMX6 MIPI-CSI

allencao — Wed, 12 Nov 2014 10:37:36 GMT

Hi,

Q1:

You are using 2-lane, right?

If so, the MIPI_CSI_PHY_STATE register should jump between 0x300 & 0x330 !

Q2:

You are right!

B.R.

Allen Cao

Re: Re: Getting an 'err_id_vc0' error on iMX6 MIPI-CSI

erezsteinberg — Wed, 12 Nov 2014 11:25:41 GMT

No... I'm using 1-lane ...

Re: Re: Getting an 'err_id_vc0' error on iMX6 MIPI-CSI

erezsteinberg — Wed, 12 Nov 2014 13:29:40 GMT

To add...

I tried with a 2-lane configuration, and I get the same err_id_vc0

With 2-lanes, I see MIPI_CSI_PHY_STATE register jump between 0x300, 0x330, and 0x630

Re: Re: Getting an 'err_id_vc0' error on iMX6 MIPI-CSI

allencao — Thu, 13 Nov 2014 01:51:23 GMT

Please measure the MIPI clock frequency when using 2-lane configuration!

Re: Getting an 'err_id_vc0' error on iMX6 MIPI-CSI

Yuri — Thu, 13 Nov 2014 05:05:40 GMT

As for the mentioned Debug steps for customer MIPI sensor.docx :

27 MHz clock source is used there, please use the patch below to set mipi-csi2 dphy clock,
based on the ref_clk out is 24M.
The patch is intended for "linux-2.6-imx/drivers/mxc/mipi/mxc_mipi_csi2.c"

===========

--- mxc_mipi_csi2.c.orig

+++ mxc_mipi_csi2.c

@@ -272,7 +272,46 @@

* @param info mipi csi2 hander

* @return Returns 0 on success or negative error code on fail

-int mipi_csi2_reset(struct mipi_csi2_info *info)

+struct _dphy_calib {

+ u32 low, high, val;

+};

+static struct _dphy_calib dphy_calib_data[] =

+ {80, 90,0x00},

+ {90,100,0x10},

+ {100,110,0x20},

+ {110,125,0x01},

+ {125,140,0x11},

+ {140,150,0x21},

+ {150,160,0x02},

+ {160,180,0x12},

+ {180,200,0x22},

+ {200,210,0x03},

+ {210,240,0x13},

+ {240,250,0x23},

+ {250,270,0x04},

+ {270,300,0x14},

+ {300,330,0x04},

+ {330,360,0x15},

+ {360,400,0x25},

+ {400,450,0x06},

+ {450,500,0x16},

+ {500,550,0x07},

+ {550,600,0x17},

+ {600,650,0x08},

+ {650,700,0x18},

+ {700,750,0x09},

+ {750,800,0x19},

+ {800,850,0x0a},

+ {850,900,0x1a},

+ {900,950,0x2a},

+ {950,1000,0x3a},

+ {0,0,0}

+};

+int mipi_csi2_reset(struct mipi_csi2_info *info, u32 freq)

{

_mipi_csi2_lock(info);

@@ -286,7 +325,27 @@

mipi_csi2_write(info, 0x00000002, CSI2_PHY_TST_CTRL0);

mipi_csi2_write(info, 0x00010044, CSI2_PHY_TST_CTRL1);

mipi_csi2_write(info, 0x00000000, CSI2_PHY_TST_CTRL0);

- mipi_csi2_write(info, 0x00000014, CSI2_PHY_TST_CTRL1);

+ {

+ int i = 0;

+ freq<<=1;

+ while(dphy_calib_data[i].low ||

+ dphy_calib_data[i].high ||

+ dphy_calib_data[i].val)

+ {

+ if(freq >= dphy_calib_data[i].low &&

+ freq <= dphy_calib_data[i].high)

+ {

+ mipi_csi2_write(info, dphy_calib_data[i].val << 1, CSI2_PHY_TST_CTRL1);//270-300

+ printk(KERN_ERR "%s: D-PHY calib for %d: %x", __FUNCTION__, freq, dphy_calib_data[i].val);

+ break;

+ }

+ i++;

+ }

+// mipi_csi2_write(info, 0x00000014, CSI2_PHY_TST_CTRL1);//800-850

+// mipi_csi2_write(info, 0x00000028, CSI2_PHY_TST_CTRL1);//270-300

+// mipi_csi2_write(info, 0x00000044, CSI2_PHY_TST_CTRL1);//180-200

+// mipi_csi2_write(info, 0x00000022, CSI2_PHY_TST_CTRL1);//125-140

+ }

mipi_csi2_write(info, 0x00000002, CSI2_PHY_TST_CTRL0);

mipi_csi2_write(info, 0x00000000, CSI2_PHY_TST_CTRL0);

=============
Have a great day,
Yuri

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Re: Getting an 'err_id_vc0' error on iMX6 MIPI-CSI

erezsteinberg — Thu, 13 Nov 2014 05:09:08 GMT

That would require special equipment that I don't have.

I was thinking--- could I write a program that initializes only the IMX208 Sensor and MIPI-CSI2 block and tries a many combinations of clock settings.

I mean:

loop

{

shutdown sensor

shutdown mipi-csi2

initialize mipi-cs2 and sensor for Configuration N

read status registers (err1, err2, d-phy stat)

}

Could something like this help me find the correct clock configuration?

Regards,

Erez

Re: Re: Getting an 'err_id_vc0' error on iMX6 MIPI-CSI

erezsteinberg — Thu, 13 Nov 2014 07:39:16 GMT

Hi Yuri,

Thank you for the additional information.

If I look at the code, it looks like the values are the same for 24MHz and 27MHz.

I used a 24MHz MCLK for the IMX208 coming from CCM_CLKO1 (osc_clk from CCM_CLKO2);

Using a scope, I can see a 24MHz clock going to the sensor.

I tried to change the MCLK to 27MHz by using 'video_27M_clk_root' for CCM_CLKO1

But -- the clock I see is ~21MHz.... This means PLL3_PFD1 is ~420MHz instead of 540MHz ... can that be?

I also checked pll3_sw_clk, and it looks to be running correctly at 480 MHz.

Regards,

Erez

Re: Re: Getting an 'err_id_vc0' error on iMX6 MIPI-CSI

erezsteinberg — Thu, 13 Nov 2014 21:51:52 GMT

Hi Yuri,

I did a fresh port of my BSP to L3.0.101 today, and I still get the same issue.

So, I wrote a 'scanner' to try all values from 0 to 255 in CSI2_PHY_TST_CTRL1.

The scan starts with resetting the IMX208 sensor, then resetting the MIPI-CSI2, and then reading the error registers and DPHY_STAT.

I get something like:

------- imx208 D-PHY Scan ---------

DPHY VAL 0 - err1 = 0x10000111 err2 = 0x1110 (300 / 300 / 310)

DPHY VAL 1 - err1 = 0x110 err2 = 0x1110 (300 / 300 / 300)

DPHY VAL 2 - err1 = 0x111 err2 = 0x1110 (300 / 300 / 300)

DPHY VAL 3 - err1 = 0x10000110 err2 = 0x1110 (310 / 310 / 310)

DPHY VAL 4 - err1 = 0x111 err2 = 0x1010 (300 / 300 / 300)

DPHY VAL 5 - err1 = 0x110 err2 = 0x1010 (300 / 300 / 300)

DPHY VAL 6 - err1 = 0x111 err2 = 0x1010 (300 / 300 / 300)

DPHY VAL 7 - err1 = 0x110 err2 = 0x1000 (310 / 310 / 300)

DPHY VAL 8 - err1 = 0x111 err2 = 0x1010 (300 / 300 / 300)

DPHY VAL 9 - err1 = 0x110 err2 = 0x1000 (300 / 300 / 300)

DPHY VAL 10 - err1 = 0x1 err2 = 0x1000 (300 / 300 / 300)

DPHY VAL 11 - err1 = 0x110 err2 = 0x1000 (300 / 300 / 300)

DPHY VAL 12 - err1 = 0x0 err2 = 0x1000 (300 / 300 / 300)

DPHY VAL 155 - err1 = 0x0 err2 = 0x0 (220 / 220 / 220)

DPHY VAL 156 - err1 = 0x0 err2 = 0x1000 (310 / 310 / 310)

DPHY VAL 157 - err1 = 0x0 err2 = 0x1000 (310 / 310 / 300)

DPHY VAL 158 - err1 = 0x0 err2 = 0x0 (300 / 300 / 300)

DPHY VAL 159 - err1 = 0x111 err2 = 0x1010 (300 / 300 / 300)

DPHY VAL 160 - err1 = 0x111 err2 = 0x1010 (300 / 300 / 300)

DPHY VAL 161 - err1 = 0x111 err2 = 0x1010 (300 / 300 / 300)

DPHY VAL 162 - err1 = 0x1 err2 = 0x1000 (310 / 310 / 310)

I got 3 values that did not result in errors during the scan, and with expected D-PHY STAT values (300 / 310)

But, even when I use these values, i eventually see errors on err1/err2.

So -- no value gives correct results.

What else could I try?

Re: Re: Getting an 'err_id_vc0' error on iMX6 MIPI-CSI

Yuri — Fri, 14 Nov 2014 09:55:47 GMT

Looks like in L3.0.101 the mentioned patch was not applied, at least, I do not see

any comments about it. Have You tried the patch ?

~Yuri.

Re: Re: Getting an 'err_id_vc0' error on iMX6 MIPI-CSI

erezsteinberg — Fri, 14 Nov 2014 10:08:37 GMT

Yes, I did.

The error is still there.

I also tried changing the MCLK to the sensor from 24Mhz to 27Mhz. No change.

Re: Re: Getting an 'err_id_vc0' error on iMX6 MIPI-CSI

Yuri — Mon, 17 Nov 2014 05:38:46 GMT

You may try to adapt and run the mipi test from the Platform SDK

imx6_platform_sdk_v1.1.0.tar\iMX6_Platform_SDK\sdk\drivers\mipi\

https://www.freescale.com/webapp/Download?colCode=i.MX6_PLATFORM_SDK&location=null&Parent_nodeId=&Parent_pageType=

~Yuri.

Re: Getting an 'err_id_vc0' error on iMX6 MIPI-CSI

erezsteinberg — Mon, 24 Nov 2014 14:45:05 GMT

Just to close the issue --- the problem was due to a non-standard data-type generated by the Sony Sensor.

The error message from the iMX6 CSI2 was correct.

After disabling the generation of the datatype by the sensor, the error is now gone.

Thanks to everyone for all the help.

Re: Getting an 'err_id_vc0' error on iMX6 MIPI-CSI

meflo — Mon, 19 Jan 2015 08:18:03 GMT

Hi Yuri,

I have a question about the reference clock (mclk). Is it the clock that that camera sensor is using internally to function?

I am using an analog to digital decoder, so I am trying to understand what this mclk is supposed to be in my case.

Thank you