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

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Date:	Thu, 05 Feb 2015 15:45:08 +0100
From:	Javier Martinez Canillas <javier.martinez@...labora.co.uk>
To:	Andrzej Hajda <a.hajda@...sung.com>,
	linux-samsung-soc@...r.kernel.org
CC:	Marek Szyprowski <m.szyprowski@...sung.com>,
	Kyungmin Park <kyungmin.park@...sung.com>,
	Kukjin Kim <kgene@...nel.org>, 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 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
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