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

["Andreas Färber" <afaerber@suse.de>]

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Am 31.07.2014 12:23, schrieb 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).

Yes, I'm referring to the default boot logo, but before the boot
messages (console=tty1) indicate that [drm] driver is being initialized.

>> 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.

Okay, that's worth a try. Around v4 of this series it was not a problem.

Thanks,
Andreas

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