linux-kernel - Re: [RFT PATCH] drm/exynos: Enable DP clock to fix display on Exynos5250 and other

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Message-ID: <7h8udau9he.fsf@deeprootsystems.com>
Date:	Wed, 29 Apr 2015 10:31:41 -0700
From:	Kevin Hilman <khilman@...nel.org>
To:	Krzysztof Kozlowski <k.kozlowski@...sung.com>
Cc:	Jingoo Han <jg1.han@...sung.com>, Inki Dae <inki.dae@...sung.com>,
	Joonyoung Shim <jy0922.shim@...sung.com>,
	Seung-Woo Kim <sw0312.kim@...sung.com>,
	Kyungmin Park <kyungmin.park@...sung.com>,
	David Airlie <airlied@...ux.ie>, Kukjin Kim <kgene@...nel.org>,
	dri-devel@...ts.freedesktop.org,
	linux-arm-kernel@...ts.infradead.org,
	linux-samsung-soc@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-fbdev@...r.kernel.org,
	Marek Szyprowski <m.szyprowski@...sung.com>,
	Andrzej Hajda <a.hajda@...sung.com>,
	Javier Martinez Canillas <javier.martinez@...labora.co.uk>,
	stable@...r.kernel.org, Olof Johansson <olof@...om.net>
Subject: Re: [RFT PATCH] drm/exynos: Enable DP clock to fix display on Exynos5250 and other

Krzysztof Kozlowski <k.kozlowski@...sung.com> writes:

> After adding display power domain for Exynos5250 in commit
> 2d2c9a8d0a4f ("ARM: dts: add display power domain for exynos5250") the
> display on Chromebook Snow and others stopped working after boot.
>
> The reason for this suggested Andrzej Hajda: the DP clock was disabled.
> This clock is required by Display Port and is enabled by bootloader.
> However when FIMD driver probing was deferred, the display power domain
> was turned off. This effectively reset the value of DP clock enable
> register.
>
> When exynos-dp is later probed, the clock is not enabled and display is
> not properly configured:
>
> exynos-dp 145b0000.dp-controller: Timeout of video streamclk ok
> exynos-dp 145b0000.dp-controller: unable to config video
>
> Signed-off-by: Krzysztof Kozlowski <k.kozlowski@...sung.com>
> Reported-by: Javier Martinez Canillas <javier.martinez@...labora.co.uk>
> Fixes: 2d2c9a8d0a4f ("ARM: dts: add display power domain for exynos5250")
> Cc: <stable@...r.kernel.org>
>
> ---
>
> This should fix issue reported by Javier [1][2].
>
> Tested on Chromebook Snow (Exynos 5250). More testing would be great,
> especially on other Exynos 5xxx products.

I hoped to try this on my exynos5 boards, but it doesn't seem to apply
to linux-next or to Linus' master branch.

Are there some other dependencies here?

Kevin
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