From mboxrd@z Thu Jan  1 00:00:00 1970
From: Stefan Agner <stefan@agner.ch>
Subject: RE: fsl-dcu not works on latest "drm-next"
Date: Mon, 06 Jun 2016 19:46:38 -0700
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To: Meng Yi <meng.yi@nxp.com>
Cc: Alexander Stein <alexander.stein@systec-electronic.com>, linux-kernel@vger.kernel.org, Mark Brown <broonie@kernel.org>, dri-devel@lists.freedesktop.org, David Airlie <airlied@linux.ie>, airlied@redhat.com
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On 2016-06-06 19:16, Meng Yi wrote:
> Hi Stefan,
> 
> Sorry for reply late, I was on PTO. And another PTO on  June 9~11, 2016.UTC+8
> 
>> >> 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 is bug?
> 

The bug is that we should not use REGCACHE_RBTREE for MMIO registers...