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

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Date:	Wed, 14 Oct 2015 10:18:10 +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 10/13/2015 03:50 PM, Yakir Yang wrote:
> On 10/13/2015 05:21 PM, Javier Martinez Canillas wrote:
> 

[snip]

>>> And it's better to enable pstore function on mainline kernel, so we can analysis the last log when
>>> the mainline kernel crashed. After enable PSTORE_RAM in .config, we still need add ramoops node
>> Interesting, I knew about pstore but I never used it with the Exynos Chromebooks.
>>
>>> into file, like:
>>> --- a/arch/arm/boot/dts/exynos5250.dtsi
>>> +++ b/arch/arm/boot/dts/exynos5250.dtsi
>>> @@ -750,6 +750,15 @@
>>>                  iommu = <&sysmmu_gsc3>;
>>>          };
>>>
>>> +       ramoops: ramoops {
>>> +               compatible = "ramoops";
>>> +               name = "ramoops";
>>> +               reg = <0x41f00000 0x100000>;
>>> +               record-size = <0x20000>;
>>> +               dump-oops;
>>> +               status = "okay";
>>> +       };
>>> +
>> Are you using mainline? There isn't a "ramoops" compatible string documented
>> in the upstream DT bindings, platform_match() would match by driver name as
>> a fallback but I don't see code in fs/pstore/ram.c that parses the properties
>> in your device node. I wonder how this works for you or did I missunderstand?
> 
> Aha, I lost some things that I back port the pstore/ram.c from chrome
> v3.14 tree which driver would parsed the "ramoops" compatible.
>

Ah, that explains it then.

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