[IMX6] - IPUv3 iomux setting after linux resume

[IMX6] - IPUv3 iomux setting after linux resume

[Pintu Agarwal]

Dear NXP,

I have a customized imx6q-dl board with the custom Linux 4.8 running on it.
It also have LCD and HDMI connected to it.
Both the display working fine during normal boot using Weston/Wayland interface.

But I am trying to support hibernate (suspend to disk) kind of feature
on this by converting IMX_DRM, ipuv3, etc. drivers as modules.
Currently, I am able to bring up LVDS display, after system resume from image.
But HDMI display is not working.
For HDMI crtc I am getting "vbank timeout issue".
{{{
[  197.735034]: drm_atomic_helper_wait_for_vblanks: waiting for vblank....
[  207.734306]: drm_atomic_helper_wait_for_vblanks: [crtc:24]: vblank
timedout, waited (3000 ms)
[  207.743538] ------------[ cut here ]------------
[  207.748276] WARNING: at drivers/gpu/drm/drm_atomic_helper.c:1133
drm_atomic_helper_wait_for_vblanks+0x26c/0x274 [drm_kms_helper]()
[  207.760060] [CRTC:24] vblank wait timed out
}}}

When I compare and debug more, I found that "ipu_irq_handler" is not
getting called after resume.

* I tried to do disable/enable_irq using suspend/resume calls in
ipuv3-crtc driver, but it did not help.
* I also tried updating several patches from latest mainline kernel,
but this also did not help.

* Read this guide about IMX-IPU:
http://cache.freescale.com/files/training/doc/ftf/2014/FTF-CON-F0119.pdf

But, this also does not provide any clue.

But, I feel that IOMUX setting for IPU/HDMI needs to be reconfigured
after resume.
So, I am looking for help from NXP about how to do this ?

If you have any other points or suggestion to solve this vblank
timeout issue, please support us.


Regards,
Pintu

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