From mboxrd@z Thu Jan  1 00:00:00 1970
From: Paolo Pisati <p.pisati@gmail.com>
Subject: Re: [RFC PATCH 1/1] drm/exynos: Move platform drivers registration
 to module init
Date: Thu, 20 Nov 2014 16:57:51 +0100
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To: Vivek Gautam <gautamvivek1987@gmail.com>
Cc: Javier Martinez Canillas <javier.martinez@collabora.co.uk>, Kevin Hilman <khilman@kernel.org>, Inki Dae <inki.dae@samsung.com>, Andrzej Hajda <a.hajda@samsung.com>, Krzysztof Kozlowski <k.kozlowski@samsung.com>, "dri-devel@lists.freedesktop.org" <dri-devel@lists.freedesktop.org>, "linux-samsung-soc@vger.kernel.org" <linux-samsung-soc@vger.kernel.org>, Paolo Pisati <p.pisati@gmail.com>, Vivek Gautam <gautam.vivek@samsung.com>

On Thu, Nov 20, 2014 at 03:22:23PM +0530, Vivek Gautam wrote:
>
> On linux-samsung tree the only patch that's missing apart from dptx-phy patches
> is the syscon patch from Pankaj Dubey:
> b784b98 mfd: syscon: Decouple syscon interface from platform devices
> 
> So with below git hash, linux-samsung/for-next display works fine along with
> other devices that request PMU system controller :
> 
> 7bd219e drm/exynos: dp: Remove support for unused dptx-phy
> e8f21fd arm: dts: Exynos5: Use pmu_system_controller phandle for dp phy
> 7099bde Revert "Revert "ARM: exynos_defconfig: Enable options for
> display panel support""
> 713a994 mfd: syscon: Decouple syscon interface from platform devices
> 7552917 Revert "ARM: exynos_defconfig: Enable options for display
> panel support"             /* This is Kukjin's for-next today */
> ff0391a Merge branch 'v3.19-samsung-defconfig' into for-next
> 26c6283 Merge branch 'v3.18-samsung-fixes' into for-next
> cf864fd Merge branch 'v3.18-samsung-defconfig' into for-next
> 98b6380 ARM: exynos_defconfig: Enable max77802 rtc and clock drivers
> 839275c ARM: exynos_defconfig: Use 16 minors per MMC block device
> 0526f27 ARM: dts: Explicitly set dr_mode on exynos5250-snow
> fc14f9c Linux 3.18-rc5

are you using a clean exynos_defconfig?
don't you need Javier's "drm/exynos: Move platform drivers registration to
module init" patch too?

kgene/for-next at:

7552917 Revert "ARM: exynos_defconfig: Enable options for display panel support"

plus:

5e1e068 arm: dts: Exynos5: Use pmu_system_controller phandle for dp phy
36d908e drm/exynos: dp: Remove support for unused dptx-phy
624bff2 POSTED: mfd: syscon: Decouple syscon interface from syscon devices
68944e3 Revert "Revert "ARM: exynos_defconfig: Enable options for display panel support""

hangs with a black screen (albeit backlight seems to be on) on boot.
I'm betting on Javier's patch at this point (i even tried disabling SND_SOC_SNOW
but that didn't help).
-- 
bye,
p.