linux-kernel - Re: [PATCH v5 0/17] Add Analogix Core Display Port Driver

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Message-ID: <56150128.2070309@osg.samsung.com>
Date:	Wed, 7 Oct 2015 13:25:28 +0200
From:	Javier Martinez Canillas <javier@....samsung.com>
To:	Yakir Yang <ykk@...k-chips.com>, Inki Dae <inki.dae@...sung.com>,
	Andrzej Hajda <a.hajda@...sung.com>,
	Joonyoung Shim <jy0922.shim@...sung.com>,
	Seung-Woo Kim <sw0312.kim@...sung.com>,
	Kyungmin Park <kyungmin.park@...sung.com>,
	Jingoo Han <jingoohan1@...il.com>,
	Heiko Stuebner <heiko@...ech.de>,
	Mark Yao <mark.yao@...k-chips.com>,
	Thierry Reding <treding@...dia.com>, joe@...ches.com,
	Krzysztof Kozlowski <k.kozlowski@...sung.com>,
	Rob Herring <robh+dt@...nel.org>
Cc:	David Airlie <airlied@...ux.ie>,
	Russell King <linux@....linux.org.uk>, djkurtz@...omium.org,
	dianders@...omium.org, Sean Paul <seanpaul@...omium.org>,
	Kukjin Kim <kgene@...nel.org>,
	Kumar Gala <galak@...eaurora.org>, emil.l.velikov@...il.com,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Gustavo Padovan <gustavo.padovan@...labora.co.uk>,
	Kishon Vijay Abraham I <kishon@...com>,
	Pawel Moll <pawel.moll@....com>, ajaynumb@...il.com,
	robherring2@...il.com, Andy Yan <andy.yan@...k-chips.com>,
	dri-devel@...ts.freedesktop.org, devicetree@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-samsung-soc@...r.kernel.org,
	linux-rockchip@...ts.infradead.org,
	linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH v5 0/17] Add Analogix Core Display Port Driver

Hello Yakir,

On 10/07/2015 01:05 PM, Yakir Yang wrote:
> Hi Javier,
> 
> On 10/07/2015 05:26 PM, Javier Martinez Canillas wrote:
>> Hello Yakir,
>>
>> On 10/07/2015 11:02 AM, Yakir Yang wrote:
>>> Hi Javier,
>>>
>>> On 10/07/2015 04:46 PM, Javier Martinez Canillas wrote:
>>>> Hello Yakir,
>>>>
>>>> On 10/07/2015 08:25 AM, Yakir Yang wrote:
>>>>> Hi all,
>>>>>
>>>>> Friendly ping.....   :)
>>>>>
>>>>>
>>>>> Best regards,
>>>>> - Yakir
>>>>>
>>>>>
>>>> Do you have a tree that I can use to test these patches?
>>> Wow, thanks a lot, I do have a tree on github [https://github.com/yakir-Yang/linux/tree/analogix_dp],
>>> crossing my finger, wish things works......    ;)
>>>
>> I tried your analogix_dp branch on an Exynos5800 Peach Pi Chromebook
>> but the machine didn't boot. Unfortunately I need to do some soldering
>> to have a serial console on this board so don't have a kernel boot log.
>>
>> I'll let you know if I can get more info about this issue.
> 
> Whoops, sorry for the failed, much appreciated for your works.
> 
> Besides, I thought maybe I can find a Peach Pit Chromebook in my side,
> I remember that some of our guys have brought one, but previously I
> thought that mainline kernel wouldn't run on Peach Pit directly.
> 

Great, mainline works correctly on all Exynos based Chromebooks.

> Maybe you can email me the method the run mainline kernel on Peach
> Pit, so I can debug the analogix_dp driver at the same time, that would
> be great.

I wrote a little blog post explaining how to run mainline on these boards:

http://blogs.s-osg.org/install-linux-mainline-kernel-distro-exynos-chromebooks/

That explains the simplest setup though so if you need a different one
(i.e: chain loading a non verified u-boot) or if you have any questions,
feel free to contact me in private and I can help you with the setup.

>> Also, there is Kconfig recursive dependency that you may want to fix:
>>
>> $ make exynos_defconfig
>> drivers/video/fbdev/Kconfig:5:error: recursive dependency detected!
>> drivers/video/fbdev/Kconfig:5: symbol FB is selected by DRM_KMS_FB_HELPER
>> drivers/gpu/drm/Kconfig:34: symbol DRM_KMS_FB_HELPER depends on DRM_KMS_HELPER
>> drivers/gpu/drm/Kconfig:28: symbol DRM_KMS_HELPER is selected by DRM_ANALOGIX_DP
>> drivers/gpu/drm/bridge/analogix/Kconfig:1: symbol DRM_ANALOGIX_DP is selected by DRM_EXYNOS_DP
>> drivers/gpu/drm/exynos/Kconfig:57: symbol DRM_EXYNOS_DP depends on DRM_EXYNOS_FIMD
>> drivers/gpu/drm/exynos/Kconfig:19: symbol DRM_EXYNOS_FIMD depends on FB_S3C
>> drivers/video/fbdev/Kconfig:2023: symbol FB_S3C depends on FB
>>   
> 
> Yeah, recursive dependency detected, guess I should remove the
> "DRM_KMS_HELPER" from bridge analogix_dp Kconfig file, thanks
> for your remind.
> 
> --- a/drivers/gpu/drm/bridge/analogix/Kconfig
> +++ b/drivers/gpu/drm/bridge/analogix/Kconfig
> @@ -1,4 +1,3 @@
>  config DRM_ANALOGIX_DP
>         tristate
>         depends on DRM
> -       select DRM_KMS_HELPER
> 
> 

That fixes the recursive dependency issue indeed. Thanks.

> Thanks,
> - Yakir

Best regards,
-- 
Javier Martinez Canillas
Open Source Group
Samsung Research America
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