linux-kernel - Re: [PATCH 1/1] ARM: dts: don't make DP a consumer of DISP1 on Exynos5250

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Date:	Mon, 16 Mar 2015 13:15:01 +0100
From:	Andreas Färber <afaerber@...e.de>
To:	Javier Martinez Canillas <javier.martinez@...labora.co.uk>
CC:	Kukjin Kim <kgene@...nel.org>, linux-samsung-soc@...r.kernel.org,
	Doug Anderson <dianders@...omium.org>,
	linux-kernel@...r.kernel.org, Andrzej Hajda <a.hajda@...sung.com>,
	Olof Johansson <olof@...om.net>,
	linux-arm-kernel@...ts.infradead.org,
	Marek Szyprowski <m.szyprowski@...sung.com>
Subject: Re: [PATCH 1/1] ARM: dts: don't make DP a consumer of DISP1 on Exynos5250

Am 14.03.2015 um 09:11 schrieb Javier Martinez Canillas:
> By making the DP controller a consumer of DISP1, the PD is powered
> off when the exynos-dp probe is deferred and powered on again when
> the exynos-drm driver is probed.
> 
> But this causes the exynos-dp driver failing to obtain the stream
> clock since the FIMD has been powered off with the DISP1 PD:
> 
> exynos-dp 145b0000.dp-controller: Timeout of video streamclk ok
> exynos-dp 145b0000.dp-controller: unable to config video
> 
> The Exynos5250 documentation doesn't mention that the Display Port
> Transmitter module is included in the DISP1 PD so the device should
> not have a reference to this Power Domain.
> 
> This patch fixes video display on an Exynos5250 Snow Chromebook.
> 
> Fixes: 2d2c9a8d0a4f ("ARM: dts: add display power domain for exynos5250")
> Signed-off-by: Javier Martinez Canillas <javier.martinez@...labora.co.uk>
> ---
> 
> Hello Andrzej and Marek,
> 
> I need this patch to have display working on an Snow Chromebook

Tested-by: Andreas Färber <afaerber@...e.de>

This fixes the display on the Spring Chromebook as well!

Thanks,
Andreas

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