Am 02.08.2014 15:13, schrieb Tomasz Figa:

On 02.08.2014 12:25, Andreas F?rber wrote:

quoted

One thing I've wondered is whether we should put status = "disabled" on
the dp node with some comment, since it's known not to work as is (but
better having the data here than leaving it out, I believe).

Does the DP node itself need more data to work or just some external
things are missing? If the former then probably status = "disabled"
should be set, otherwise "okay" is fine if provided data are enough to
probe the Exynos DP driver.

Support for ps8622 eDP/LVDS bridge has not yet landed in the drm tree.

The latest patch series V6 adds a "bridge" property to /dp-controller.
It further requires a simple-panel node and a node for the ps8622:

http://www.spinics.net/lists/linux-samsung-soc/msg35089.html

quoted

Of course if either of you has input on the discussions on the drm
bridge/panel series V6 [1] for how to enable non-simplefb display and
iommus, that would be valuable.

Support for Exynos IOMMU is being worked on right now and patches adding
DT support from Marek Szyprowski should show up on the lists in very
near future.

Okay, good to hear.

However I think you don't strictly need IOMMU to get
non-simplefb display, as CMA can be used to allocate contiguous memory.

I do have CMA enabled, but it wasn't working without iommu patches
either. Machine booted, and display had backlight but stayed black.

CONFIG_CMA=y
# CONFIG_CMA_DEBUG is not set
CONFIG_DMA_CMA=y
CONFIG_CMA_SIZE_MBYTES=64
CONFIG_CMA_SIZE_SEL_MBYTES=y
# CONFIG_CMA_SIZE_SEL_PERCENTAGE is not set
# CONFIG_CMA_SIZE_SEL_MIN is not set
# CONFIG_CMA_SIZE_SEL_MAX is not set
CONFIG_CMA_ALIGNMENT=8
CONFIG_CMA_AREAS=7

Ajay has reported the same patches working on his Skate.

Regards,
Andreas

quoted

[1] http://www.spinics.net/lists/linux-samsung-soc/msg35274.html

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