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

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Date:	Tue, 7 Jun 2016 03:47:52 +0000
From:	Meng Yi <meng.yi@....com>
To:	Stefan Agner <stefan@...er.ch>,
	Alexander Stein <alexander.stein@...tec-electronic.com>
CC:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Mark Brown <broonie@...nel.org>,
	"dri-devel@...ts.freedesktop.org" <dri-devel@...ts.freedesktop.org>,
	David Airlie <airlied@...ux.ie>,
	"airlied@...hat.com" <airlied@...hat.com>
Subject: RE: fsl-dcu not works on latest "drm-next"

Hi Stefan,

> >> static const struct regmap_config fsl_dcu_regmap_config = {
> >>     .reg_bits = 32,
> >>     .reg_stride = 4,
> >>     .val_bits = 32,
> >>     .cache_type = REGCACHE_RBTREE,
> >
> > This needs to be a flat cache. See
> > https://lists.freedesktop.org/archives/dri-devel/2016-January/099121.h
> > tml or https://lkml.org/lkml/2016/3/24/281
> > max_register also needs an appropriate value.
> 
> Ok, since the complete set which switches to the atomic helper is not stable
> material (and also won't make it into 4.7 anymore), I created a seperate bugfix
> now:
> https://lists.freedesktop.org/archives/dri-devel/2016-June/109625.html
> 
> What I don't quite get yet is the REGCACHE_FLAT influencing the endianness
> behavior?
> 

I think it didn't. And endianness issue have been fixed by regmap maintainer.

> If it is, Meng, can you test again with v4.7-rc1 + the FLAT cache patch above?
> 

I have tested FLAT cache on LS1021A, it works fine. By the way do you have any opinion on LS1021A's
HDMI driver? 

Regards,
Meng