Re: [PATCH V4 00/10] drm: exynos: few patches to enhance bridge chip support

From: "Andreas Färber" <afaerber@suse.de>
To: Ajay kumar <ajaynumb@gmail.com>, Doug Anderson <dianders@chromium.org>
Cc: "Ajay Kumar" <ajaykumar.rs@samsung.com>,
	"dri-devel@lists.freedesktop.org"
	<dri-devel@lists.freedesktop.org>,
	"linux-samsung-soc@vger.kernel.org"
	<linux-samsung-soc@vger.kernel.org>,
	"devicetree@vger.kernel.org" <devicetree@vger.kernel.org>,
	"Vincent Palatin" <vpalatin@chromium.org>,
	"InKi Dae" <inki.dae@samsung.com>,
	"Sean Paul" <seanpaul@google.com>,
	"Rob Clark" <robdclark@gmail.com>,
	"Daniel Vetter" <daniel.vetter@ffwll.ch>,
	"Thierry Reding" <thierry.reding@gmail.com>,
	"sunil joshi" <joshi@samsung.com>,
	"Prashanth G" <prashanth.g@samsung.com>,
	"Stéphane Marchesin" <marcheu@chromium.org>,
	"Rahul Sharma" <rahul.sharma@samsung.com>
Subject: Re: [PATCH V4 00/10] drm: exynos: few patches to enhance bridge chip support
Date: Fri, 04 Jul 2014 15:06:56 +0200	[thread overview]
Message-ID: <53B6A6F0.1070108@suse.de> (raw)
In-Reply-To: <CAEC9eQPee1CYQa01V93pTwwNbAZ=h5wVznQ-_PGoWmxSZV3Tbg@mail.gmail.com>

Hi Ajay,

Am 03.07.2014 16:55, schrieb Ajay kumar:
> On Thu, Jul 3, 2014 at 10:49 AM, Andreas Färber <afaerber@suse.de> wrote:
>> Am 11.06.2014 20:26, schrieb Ajay Kumar:
>>> This series is based on exynos-drm-next branch of Inki Dae's tree at:
>>> git://git.kernel.org/pub/scm/linux/kernel/git/daeinki/drm-exynos.git
>>>
>>> I have tested this after adding few DT changes for exynos5250-snow,
>>> exynos5420-peach-pit and exynos5800-peach-pi boards.
>>
>> Unfortunately this series per se does not yet fix my display issues on
>> the Spring Chromebook. Can you share what dt changes you made for Snow?
>>
>> Before, if the dp-controller dt node was present, I would get a dark
>> screen immediately and I could ssh into the system shortly after.
>> I worked around that by commenting the node out, which would allow me to
>> graphically boot pretty much instantly.
>>
>> With these 10 patches applied on top of my dt on top of kgene's tree,
>> the last U-Boot screen stays visible for ~50 seconds, then the screen
>> goes blank, and I can ssh in some time later.
>> If I comment out the dp-controller node again, it takes long for the
>> kernel boot to graphically proceed but works okay then.
>> In both cases there's a gap of ~2900 seconds visible in dmesg.
[...]
>> https://github.com/afaerber/linux/commits/spring-next
>> https://github.com/afaerber/u-boot/commits/spring
> You need to add bridge chip node and panel node to use my patch series.
> Also, to support that you need to enable tps65090 regulator on spring.
> 
> I have attached a patch which adds the bridge chip node and panel node.

Wow, that's more help than I expected! Many thanks.

I'll strip down dp-controller accordingly for my v2.

Your dt changes level again with my commenting out dp-controller. So I
take it, the minute-long delay is regulator-induced somehow.

> Also, I have attached a sample config which I used to compile the kernel.

I simply answered y to all your new options. :)

> Doug can help you in adding changes required for tps65090.

Hm, Doug had pointed out an issue with tps65090 in my v1, so I dropped
it: https://patchwork.kernel.org/patch/4397321/

Regards,
Andreas

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