linux-kernel - Re: fsl-dcu not works on latest "drm-next"

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Date:	Wed, 25 May 2016 11:57:16 +0200
From:	Alexander Stein <alexander.stein@...tec-electronic.com>
To:	Meng Yi <meng.yi@....com>
Cc:	Stefan Agner <stefan@...er.ch>,
	"dri-devel@...ts.freedesktop.org" <dri-devel@...ts.freedesktop.org>,
	David Airlie <airlied@...ux.ie>,
	"airlied@...hat.com" <airlied@...hat.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Mark Brown <broonie@...nel.org>
Subject: Re: fsl-dcu not works on latest "drm-next"

Hi,

On Wednesday 25 May 2016 08:58:31, Meng Yi wrote:
> > On Tuesday 24 May 2016 23:20:02, Stefan Agner wrote:
> > > On 2016-05-24 19:14, Meng Yi wrote:
> > > > I found that its regmap endianness issue, so I want to replace the
> > > > "regmap".
> > > 
> > > Hm, replace with what? Note that we need some kind of endianness
> > > convertion since the IP is big endian on LS1021a and little endian on
> > > Vybrid (vf610).
> > 
> > Yep, regmap is required and was broken meanwhile but should be fixed now.
> > See linked lkml post.
> > 
> > > Is it maybe just an issue with regmap/the big-endian property in the
> > > device tree? Maybe this thread is interesting for you:
> > > https://lkml.org/lkml/2016/3/23/233
> > 
> > AFAICT device tree should not been changed here. The "big-endian" property
> > was there fromt he beginning.
> > 
> > > > 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
> > 
> > > > And not works now. some log below:
> > Which commit actually broke your kernel? And where to fetch it from? Is
> > your problem really caused by regmap?
> 
> Since there are lots of merge commit, I had manually debugged that issue.
> And yes, it is caused by regmap. I fetched the kernel from
> git://people.freedesktop.org/~airlied/linux

Commit d761701c55a99598477f3cb25c03d939a7711e74 only has one child commit in 
my repo. Both touch only i915 related things. Please do a proper bisect and 
name the offending commit. On which commit you got that backtrace BTW?
>From your backtrace I can't see anything related to regmap.

Best regards,
Alexander