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From:   Pintu Agarwal <pintu.ping@gmail.com>
Date:   Fri, 21 Jun 2019 20:42:53 +0530
Message-ID: <CAOuPNLhstoCjxijrnKNmV1iKWjAXvSZ38Z13tfd5bvGbYSqPAA@mail.gmail.com>
Subject: Re: [IMX] [DRM]: suspend/resume support
To:     Fabio Estevam <festevam@gmail.com>
Cc:     open list <linux-kernel@vger.kernel.org>,
        "moderated list:ARM/FREESCALE IMX / MXC ARM ARCHITECTURE" 
        <linux-arm-kernel@lists.infradead.org>,
        Kernelnewbies <kernelnewbies@kernelnewbies.org>,
        linux-pm@vger.kernel.org
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Sender: linux-kernel-owner@vger.kernel.org
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On Wed, Jun 19, 2019 at 8:59 PM Pintu Agarwal <pintu.ping@gmail.com> wrote:

> > > This scenario is not with suspend/resume.
> > > This hang is, when we make hdmi as a loadable module (.ko) and trying
> > > to install it after resume.
> > > In this case, suspend/resume will not come into picture. Not sure why
> > > it still hangs.
> > > Do you have any clue for this scenario?
> >
> > I haven't tried this one.
> >

Okay there is some update on the 2nd part.
Now I am able to successfully install all imx modules after the resume
(no hang).
But, I got some errors after install finish:
[drm] disabling vblank on crtc 1
[IMX]: imx_drm_disable_vblank - called
[drm:drm_atomic_helper_commit_cleanup_done] *ERROR* [CRTC:24:crtc-0]
flip_done timed out

Also I am able to start the weston successfully.
But I see LCD/HDMI display is not working (only some backlight is visible).

And, I noticed, weston also reports the following errors:
imx-ipuv3 2400000.ipu: DC stop timeout after 50 ms
[IMX]: drm_crtc_vblank_off - called
[IMX]: imx_drm_disable_vblank - called
INFO: rcu_preempt detected stalls on CPUs/tasks: { 1} (detected by 0,
t=6002 jiffies, g=289, c=288, q=8)
Task dump for CPU 1:
weston          R running      0   306      1 0x00000000
[<c05282d8>] (__schedule) from [<00080193>] (0x80193)

Do you have any clue about these errors ?

Thanks,
Pintu