linux-kernel - Re: [RFC PATCH 0/3] Fix power domains handling on exynos542x

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Message-ID: <54FEBE06.3000007@collabora.co.uk>
Date:	Tue, 10 Mar 2015 10:48:54 +0100
From:	Javier Martinez Canillas <javier.martinez@...labora.co.uk>
To:	Kukjin Kim <kgene@...nel.org>
CC:	linux-samsung-soc@...r.kernel.org,
	Andrzej Hajda <a.hajda@...sung.com>,
	Marek Szyprowski <m.szyprowski@...sung.com>,
	Kyungmin Park <kyungmin.park@...sung.com>, Liquid.Acid@....net,
	devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
	dri-devel@...ts.freedesktop.org
Subject: Re: [RFC PATCH 0/3] Fix power domains handling on exynos542x

Hello Kukjin,

On 02/05/2015 03:45 PM, Javier Martinez Canillas wrote:
> Hello Andrzej,
> 
> Thanks a lot for finally finding what was causing the HDMI issue.
> 
> On 02/05/2015 01:35 PM, Andrzej Hajda wrote:
>> Hi,
>> 
>> Exynos chipsets since 542x have asynchronous bridges connecting different IPs.
>> These bridges should be operational during power domain switching, ie associated
>> clocks cannot be gated.
>> This patchset adds binding to provide such clocks per power domain and adds code
>> which enables them during domain on/off operation.
>> 
>> This patchset fixes power domain issues with disp1 domain and HDMI (some of them)
>> on Odroid XU3:
>> - disp1 power domain can be turned off,
>> - no more "imprecise external abort" faults.
>> 
>> The patchset is based on '[PATCH v5 0/9] Enable HDMI support on Exynos platforms' [1].
>> 
> 
> It also depends on '[PATCH 0/2] Add HDMI support for Exynos5420 platform' [2].
> 
>> It was successfully tested on OdroidXU3.
>> 
>> [1]: http://permalink.gmane.org/gmane.linux.kernel.samsung-soc/42743
> 
> Your patches looks good to me so please feel free to add:
> 
> Reviewed-by: Javier Martinez Canillas <javier.martinez@...labora.co.uk>
> 
> I also tested on an Exynos5420 Peach Pit Chromebook and both the "Power
> domain power-domain disable failed" message and the system crash are gone.
> 
> Tested-by: Javier Martinez Canillas <javier.martinez@...labora.co.uk>
> 
> Best regards,
> Javier
> 
> [2]: https://lkml.org/lkml/2015/1/20/235
> 

Any comments about this series? It fixes system hangs on Exynos
5420/5422/5800 boards and has been in the list for a while.

Please keep in mind that a v2 of patch 3/3 was posted [0].

Best regards,
Javier

[0]: https://lkml.org/lkml/2015/2/6/138
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