[PATCH V6 0/8] drm/exynos: few patches to enhance bridge chip support

[Thierry Reding]

On Thu, Jul 31, 2014 at 10:57:55AM +0200, Andreas Färber wrote:
> Am 31.07.2014 10:38, schrieb Ajay kumar:
[...]
> > With just the spring-bridge.v6 branch of your own tree, I am able to see
> > bootup logo on Skate(a variant of spring which also contains ps8622).
> > I have tried both exynos_defconfig and multi_v7_defconfig.
> > I enable DRM, EXYNOS DRM, BRIDGE CHIPS, IOMMU, EXYNOS IOMMU
> > in configs.
> > 
> > Even in your bootlogs, I can see DP getting probed.
> > And, you say backlight is also visible. That means entire display
> > path should be fine. Its just that you should start writing to the buffer.
> > Have you enabled boot logos?
> 
> Let me clarify: U-Boot uses the display [*], so it is powered and I see
> penguins initially. Then, when drm gets initialized, the screen goes
> black and no longer prints kernel messages or systemd output or X11 gdm
> login screen.

Who's displaying the penguins? If you're referring to the Linux boot
logo then it shouldn't be displayed at all until after DRM has been
initialized (and the framebuffer console been set up).

> Since drm stuff is the only variance here and it works with simplefb,
> surely something prints to some buffer!

If you have something like simplefb enabled in addition to a DRM driver,
then perhaps the DRM driver isn't properly taking over the framebuffer
console.

Thierry
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