I found ipu warning

[garyyin]

when I run ipu test, input is 1920x1080 raw YUYV 16bit stream, output is 1280x720 RGB888.

(i.mx6solo, linux 3.10.45)

I see lots of:

imx-ipuv3 2400000.ipu: IPU Warning - IPU_INT_STAT_10 = 0x00080000

imx-ipuv3 2400000.ipu: IPU Warning - IPU_INT_STAT_10 = 0x00080000

imx-ipuv3 2400000.ipu: IPU Warning - IPU_INT_STAT_10 = 0x00080000

imx-ipuv3 2400000.ipu: IPU Warning - IPU_INT_STAT_10 = 0x00080000

...

and the screen is flickering. Reboot the machine, then run the same app, everything is ok. What's the problem?

[claymontgomery]

I had this same problem running OpenELEC (Kodi) at 1080p and adding 'dmfc=3' fixed the problem. Sometimes the bootargs can be overridden by the uEnv.txt, so check that it is really set correctly with:

cat  /proc/cmdline

Thanks, Clay

[thomasgrimault]

Hi Igor,

I have the same problem as Gary, but the dmfc=3 parameter didn't change anything.

I use kernel 3.14.52 on SabreSD-like board, with 1280x720 RGB888 video output as well.

Thomas

[claymontgomery]

Hi Thomas,

  How were you playing video when you got these IPU warnings?

imx-ipuv3 2400000.ipu: IPU Warning - IPU_INT_STAT_10 = 0x00080000

Were you using ffmpeg, gstreamer, or what? It seems to be a problem with the IPU's scaler and some apps avoid using the IPU's scaler by using V4L2 instead.

Thanks, Clay

[igorpadykov · Accepted solution]

Hi Gary

please try the 'dmfc=3' kernel boot-up command option. This would increase

display FIFO size for display per IPU.

Best regards

igor

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[claymontgomery]

Igor,

Can you please provide a link to a document that explains the use of the dmfc parameter? Would using a value larger than 3 possibly increase the reliability of video play and what is the memory cost of this?

Thanks, Clay

[igorpadykov]

Hi Clay

please refer to attached Release Notes Table 11. Common kernel boot

parameters p.23

Best regards
igor

[prateek22]

In this release note nxp mentioned that hdmi cannot be configured from kernel under known issue.