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.
[...]
> 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.

So, with simplefb reverted in U-Boot and ...

* with just the v6 applied (...~2), I get only a black screen from
Linux, no penguins, but the backlight seems on. System comes up okay,
ssh available, and nothing stands out in dmesg.

* with the two iommu patches on top, something breaks badly, no
backlight, no USB/network, system inaccessible.

I.e. U-Boot had no noticeable impact on these symptoms.

* with the iommu patches, but dp-controller, ps8622, panel commented
out, I do get backlight but USB/network not working, system inaccessible.

With simplefb support in U-Boot and with just v6 applied, but
dp-controller, ps8622, panel commented out, things work as well as
before, i.e. this series has no bad side effects. Note that I never
claimed Ajay's series were broken, just reported that things regressed
for me from v4, which may well be DT-related.

The iommu patches interfere with my USB somehow (none or not all devices
powered; with v4, plugging my wifi dongle led to oops but ethernet
dongle worked, so not entirely new symptom), which is bad since my
rootfs is on USB. The internal SDIO-connected Wifi is not enabled yet,
so USB based network is my only alternative to a working display once we
reach userspace.

Regards,
Andreas

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