imx6 HDMI working status differed by cable plugging

[TKayO]

Hello, 

My imx6qp board has HDMI, 

if my board powered with the HDMI port is plugged to a monitor, 

while Android booting, my monitor shows the framebuffer content and

plug & plug to other monitor also works well..

But my board boot up without plugging any HDMI cable, 

after booting is done, HDMI is not working.

Cable plugging event is active but no screen output on my monitor.

attached two different log

Please give me any hint.

Regards.

[igorpadykov]

Hi WOOSEOK

what bsp used in the case, hdmi cable plugging issues were in old releases as reported for example on

https://www.yoctoproject.org/pipermail/meta-freescale/2014-July/009430.html

May be recommended to try latest nxp releases

https://www.nxp.com/design/software/embedded-software/i-mx-software/android-os-for-i-mx-applications...

Best regards
igor

[TKayO]

@igorpadykov Is that all?  since my recent updates, you didn't mentioned anything.. 

+

fb0 is for LCD, 

fb1 is for HDMI and boot param has info about it.

When cable is plugged, fb1 is reconfigured and done something about init. but

without cable, it's not. 

[igorpadykov · Accepted solution]

please try to reproduce issue on NXP Sabre SD reference board with

Demo Image i.MX 6Quad, i.MX 6QuadPlus, and i.MX 6DualLite SABRE-AI​

Best regards
igor

[TKayO]

Thank you for your concern

and sorry for my frequent questions.

it was a hardware problem.  there was no pull-up register for the HPD pin.

[TKayO]

also looks very similar with below issue

https://community.nxp.com/t5/i-MX-Processors/imx-hdmi-audio-HDMI-Video-is-not-ready/td-p/478851

but my kernel parameter contains 

"video=mxcfb0:dev=mipi_dsi,ST7703-HD,if=RGB24 video=mxcfb1:dev=hdmi,1920x1080M@60,if=BGR24"

[TKayO]

Dear Igor, 

Also you can see from my attachments, 

When I power up my board without HDMI cable plugged, below error message occurs.

[ 17.976039] imx-hdmi-audio imx-hdmi-audio: HDMI Video is not ready!
[ 17.981175] imx-hdmi-audio imx-hdmi-audio: ASoC: can't open platform imx-hdmi-audio: -22
[ 17.988414] imx-hdmi-audio imx-hdmi-audio: HDMI Video is not ready!
[ 17.993415] imx-hdmi-audio imx-hdmi-audio: ASoC: can't open platform imx-hdmi-audio: -22

Thank you

[TKayO]

FYI, my android bsp version is "p9.0.0_2.2.0-ga"

[TKayO]

Thank you for your reply Igor, 

But my case is opposite, HDMI works only when the cable is plugged at the time power enabled.

After boot up, then I plug the cable, there's no EDID handshaking happens and no display at all.