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

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Message-ID: <HE1PR04MB1051CC514FF5950D84900DD2EC400@HE1PR04MB1051.eurprd04.prod.outlook.com>
Date:	Wed, 25 May 2016 08:58:31 +0000
From:	Meng Yi <meng.yi@....com>
To:	Alexander Stein <alexander.stein@...tec-electronic.com>,
	Stefan Agner <stefan@...er.ch>
CC:	"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 Alexander,

> From: Alexander Stein [mailto:alexander.stein@...tec-electronic.com]
> Sent: Wednesday, May 25, 2016 4:32 PM
> To: Stefan Agner <stefan@...er.ch>
> Cc: Meng Yi <meng.yi@....com>; dri-devel@...ts.freedesktop.org; David Airlie
> <airlied@...ux.ie>; airlied@...hat.com; linux-kernel@...r.kernel.org; Mark
> Brown <broonie@...nel.org>
> Subject: Re: fsl-dcu not works on latest "drm-next"
> 
> 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

Best Regards,
Meng Yi