topic Re: I found ipu warning in i.MX Processors

I found ipu warning

garyyin — Sun, 03 Jul 2016 12:17:03 GMT

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

...

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

Re: I found ipu warning

igorpadykov — Mon, 04 Jul 2016 00:24:28 GMT

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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Re: I found ipu warning

thomasgrimault — Mon, 03 Oct 2016 22:18:23 GMT

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

Re: I found ipu warning

claymontgomery — Sun, 15 Jan 2017 02:19:30 GMT

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

Re: I found ipu warning

claymontgomery — Sat, 21 Jan 2017 18:18:29 GMT

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

Re: I found ipu warning

claymontgomery — Sun, 22 Jan 2017 23:02:17 GMT

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

Re: I found ipu warning

igorpadykov — Sun, 22 Jan 2017 23:27:43 GMT

Hi Clay

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

parameters p.23

Best regards
igor

Re: I found ipu warning

prateek22 — Wed, 03 Apr 2024 09:28:18 GMT

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