topic Re: i.mx6 HDMI without I2C in i.MX Processors

i.mx6 HDMI without I2C

zc_tee — Mon, 07 Sep 2015 08:03:42 GMT

Hi all,

I am currently trying to enable the HDMI display on the i.mx6 quad CPU.

May i know whether the HDMI_TX_DDC_SCL and HDMI_TX_DDC_SDA pin connection is mandatory in order for the HDMI core to function? I see that in the driver drivers/video/mxc_hdmi.c, there are a lot of configurations that is related to i2c communication. What will happen if i did not connect out both the HDMI SCL and SDA pin?

By the way, I do not need to configure any setting on the HDMI display.

Thanks.

Regards,

Re: i.mx6 HDMI without I2C

igorpadykov — Mon, 07 Sep 2015 11:16:46 GMT

Hi ZC

one can work with i.MX6 HDMI without using HDMI SCL and SDA or

using ordinary I2C signals.

Best regards

igor

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Re: i.mx6 HDMI without I2C

zc_tee — Tue, 08 Sep 2015 00:51:03 GMT

Hi Igor,

Thanks for reply,

Just for confirmation, does it means that I MUST connect at least one I2C port (be it HDMI I2C or ordinary I2C) to the HDMI display in order for the HDMI to work?

What will happen if the I2C port of the HDMI display is left unconnected?

Regards,

Re: i.mx6 HDMI without I2C

Yuri — Tue, 08 Sep 2015 02:26:25 GMT

Hello,

You may set HDMI in DVI mode.

Also, it will be needed to add the new 'allow_noncea=1' environment variable in the U-Boot
configuration and the proper arguments for display resolution to the kernel command line.

Regards,

Yuri.

Re: i.mx6 HDMI without I2C

igorpadykov — Tue, 08 Sep 2015 02:39:58 GMT

Hi ZC

no, it does not mean that one must to connect at least one I2C port.

Best regards

igor

Re: i.mx6 HDMI without I2C

zc_tee — Tue, 08 Sep 2015 04:29:00 GMT

Hi all,

Currently i facing problem where i cannot get the HPD interrupt.

I checked the hardware signal, when plugged in, the HPD pin is HI, and when plugged out, the HPD pin is LO.

However, kernel does not goes in to irq routine mxc_hdmi_hotplug, and also not going in to hotplug_worker at all.

Any idea why is this happening? i am using kernel BSP 3.0.101.

Regards,

Re: i.mx6 HDMI without I2C

igorpadykov — Tue, 08 Sep 2015 06:54:06 GMT

Hi ZC

please create new thread, as this is new problem.

Best regards

igor