DSI bringup for CAF LittleKernel on Lumia 520 (rm-914)

Hi all, I hope I'm posting this in the correct forum.
I want to port Android or B2G to Lumia 520, and I have problems getting the display to work.
I could successfully boot CAF LittleKernel on the device, I can access fastboot and flash the phone using it, even found some info on the display configuration, but something does not work, and I cannot figure out the reason for which it hangs.

I'm using this LK source:
LA.BF64.1.2.2_rb4.10

I'm building this for "msm8960" target, as that should be compatible with the SoC in this phone (msm8227)
I have added my own panel driver and some debug messages, my latest committed version can be found on my Github
It goes into a while loop, and it won't get out of that, and I have no idea, why the condition never becomes true (should be changed by an interrupt)

Last message I see on UART is "(display_legacy/mipi_dsi_phy.c : mipi_dsi_phy_init) Waiting for PHY to be ready" (added in the latest commit, it's easy to find: platform/msm_shared/display_legacy/mipi_dsi_phy.c:177)

I would appreciate if somebody could help me

Thanks: FeherNeoH

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