fsl-dcu not works on latest "drm-next"

[Meng Yi]

Hi Stefan,

> -----Original Message-----
> From: Stefan Agner [mailto:stefan at agner.ch]
> Sent: Wednesday, May 04, 2016 12:08 AM
> To: Meng Yi <meng.yi at nxp.com>
> Cc: dri-devel at lists.freedesktop.org; David Airlie <airlied at linux.ie>;
> airlied at redhat.com
> Subject: Re: fsl-dcu not works on latest "drm-next"
> 
> Hi Meng,
> 
> Please use plain text mails on mailing lists.
> 

Ok, Thanks!

> On 2016-05-03 02:26, Meng Yi wrote:
> 
> > Hi,
> >
> > I just tested the latest drm-next branch on Freescale/NXP ls1021a-twr, and
> got some log below. And fsl-dcu not works.
> >
> > Since "drm-next" merged some branch , use git bisect had some problem
> > ,
> >
> > so I manually checked out that "fsl-dcu" works at
> > d761701c55a99598477f3cb25c03d939a7711e74
> 
> Hm, that commit seems rather unrelated... is that what git bisect told you?
> 

Yeah, It seems having nothing to do with the issue. 

I manually found that commit, "fsl-dcu" not works at that commit, but works at commit before it.

But I have no idea of this.

> I guess my last pull request could be related to that, so maybe you can check
> those two commits manually:
> 077d67374e ("drm: rcar-du: Fix compilation warning") vs.
> 0449eefe2d ("drm/fsl-dcu: increment version and date")
> 
> 

Thanks, I will check those two commits.

> >
> > And not works now. some log below:
> >
> > [drm] Initialized drm 1.1.0 20060810
> >
> > panel supply power not found, using dummy regulator
> >
> > [drm] Supports vblank timestamp caching Rev 2 (21.10.2013).
> >
> > [drm] No driver support for vblank timestamp query.
> >
> > ------------[ cut here ]------------
> >
> > WARNING: CPU: 0 PID: 1 at drivers/gpu/drm/drm_atomic_helper.c:1106
> > drm_atomic_helper_wait_for_vblanks+0xff/0x124
> >
> > [CRTC:24] vblank wait timed out
> 
> It seems that interrupt do not work properly. Could it be that work elsewhere
> caused that issue?
> 
I don't know so far.

Thanks,
Meng