linux-kernel - Re: [PATCH 1/1] Revert "ARM: dts: add display power domain for exynos5250"

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Date:	Fri, 27 Mar 2015 15:34:27 +0100
From:	Javier Martinez Canillas <javier.martinez@...labora.co.uk>
To:	Krzysztof Kozlowski <k.kozlowski@...sung.com>
CC:	Kukjin Kim <kgene@...nel.org>, Olof Johansson <olof@...om.net>,
	Andreas Färber <afaerber@...e.de>,
	Marek Szyprowski <m.szyprowski@...sung.com>,
	Doug Anderson <dianders@...omium.org>,
	Andrzej Hajda <a.hajda@...sung.com>,
	linux-samsung-soc@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/1] Revert "ARM: dts: add display power domain for exynos5250"

Hello Krzysztof,

On 03/27/2015 03:29 PM, Krzysztof Kozlowski wrote:
> 2015-03-23 11:49 GMT+01:00 Javier Martinez Canillas
> 
> I looked at the DP and FIMD drivers and with great help of Andrzej
> Hajda found the issue: the FIMD driver does not enable DP clock
> (DP_MIE_CLKCON register). The process looks like:
> 1. Bootloader sets the DP_MIE_CLKCON to proper value.
> 2. FIMD is probed, DP power domain is on.
> 3. FIMD is deffered, DP power domain is turned off.
> 4. The FIMD registers are reset so DP clock is turned off.
> 5. DP driver is probed, DP power domain is turned on but clock is not enabled.
>

Great! I knew it was some setup missing that was made by the boot-loader.

> I'll do some more testing and sent a patch for it till end of Monday
> so I think we should not revert this commit.
>

Agree, I of course preferred to fix the actual cause instead of relying
on the boot-loader to do the initialization but I wasn't able to figure
it out so I posted this patch to revert the commit in the meantime.

> Best regards,
> Krzysztof
> 

Best regards,
Javier
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