Ok, so last night I think I figured out why pageflipping was borked with mergedfb. Unfortunately the fix requires changes to the drm and sarea. I'm wondering what the best way to do this is and maintain compatability. When crtc1 is at offset 0 pageflipping should work with a simple patch to radeon_driver.c::RadeonDoAdjustframe(). the backbuffer offset was being added to the base address after the crtc2_base info was updated in the sarea. That's an easy fix. For situations where crtc2 is at offset 0 and crtc1 is at a higher offset, changes to the drm and sarea are required. I think the easiest solution would be to add a crtc1_base to the sarea and update that in RadeonDoAdjustframe() just like crtc2_base. The problem is that in the drm in radeon_state.c::radeon_cp_dispatch_flip() the offset of crtc1 is calculated from the sarea frame info which could be crtc1 or crtc2 depending on their orientation. It should really be calcluated in RadeonDoAdjustframe() just like crtc2 base. So how to I do it in a compatible way?
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