i.MX ProcessorsのトピックRe: i.mx6 HDMI_HPD pin not detected

i.mx6 HDMI_HPD pin not detected

zc_tee — Wed, 09 Sep 2015 00:35:23 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_HPD pin not detected

igorpadykov — Wed, 09 Sep 2015 02:07:06 GMT

HI ZC

one can look at links discussing about HDMI_HPD detection

https://community.freescale.com/thread/327503

https://community.freescale.com/thread/326283

Best regards

igor

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Re: i.mx6 HDMI_HPD pin not detected

zc_tee — Wed, 09 Sep 2015 09:09:36 GMT

Hi Igor,

The links above describe the basic functional of the HPD pin, as well as another problem from an user who gets the interrupt infinitely.

However, in my case, i do not get the interrupt at all. Therefore I think my problem is different from him.

I had tried to connected directly the HDMI connector's HPD pin and i.mx6's HDMI_HPD pin, but still no luck. HPD interrupt still not detected by the kernel.

I am using a Philips Monitor. Monitor is confirmed to be working as i can connect it to my PC and it shows.

Regards,

Re: i.mx6 HDMI_HPD pin not detected

igorpadykov — Wed, 09 Sep 2015 10:53:16 GMT

HI ZC

could you check HDMI_PHY_STAT0 bit HPD ?

Best regards

igor

Re: i.mx6 HDMI_HPD pin not detected

zc_tee — Thu, 10 Sep 2015 02:23:51 GMT

Hi Igor,

HDMI_PHY_STAT0 and HDMI_IH_PHY_STAT0 both read as 0x00 regardless HDMI cable is plugged in or out.

Regards,

Re: i.mx6 HDMI_HPD pin not detected

igorpadykov — Thu, 10 Sep 2015 02:52:21 GMT

HI ZC

what board are you using, could you check on Sabre board ?

Best regards

igor

Re: i.mx6 HDMI_HPD pin not detected

zc_tee — Thu, 10 Sep 2015 09:12:01 GMT

Hi Igor,

Found the problem. The board does not connect the HDMI_VP and HDMI_VPH to the correct voltage. The HDMI core does not power up at all.

Thanks and sorry for the mistake.

Regards,

Re: i.mx6 HDMI_HPD pin not detected

zc_tee — Tue, 15 Sep 2015 01:40:48 GMT

Hi Igor,

I am using our custom board. I will check on sabre board when i got some time later on. Now proceed with other task already.