[IMX] [DRM]: suspend/resume support

Pintu Agarwal pintu.ping at gmail.com
Mon Jun 17 09:49:27 EDT 2019

Hi All,

I am trying to implement suspend/resume functionality to to imx-hdmi driver:

So, I need some help about this.
I logged the request in imx community, but it seems they are not responding.
Firstly I expect nxp community members to support (if anybody here).
Otherwise, I guess, people who are experts here and have prior
experience in implementing suspend/resume for their drivers, should be
able to give me some guidance.

Currently, I am trying to understand what needs to be taken care
during suspend/resume.
With some reference, I figured out that hdmi power off/on needs to be
done during suspend/resume.
But after resume, system is hanging.
It seems like vblank events are not getting triggered after the resume.
May be irq remains disabled after resume, I need to figure out some
way to enable the all the irqs again.

Even if I try to install hdmi driver as a dynamic loadable module,
still I get the same issue.

So, I wonder, what is the right way to handle suspend/resume for any driver.
Some clue/reference should help me to keep going...


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