On Tue, Jan 23, 2018 at 2:00 AM, tony.mansson@objektutveckling.se wrote:

Hi guys.

I'm working for a client that would very much like to run the hikey960 in vr-mode in order to get minimum latency. In this product the latency from input to screen (HDMI) is the deal breaker.

This means that I need to run at least Android 8.0 (probably 8.1) with "TARGET_USES_HWC2" set. Apparently HWC2 contains some hardware-specific parts, but as far as I can tell, there is still no HWC2 available from HiSilicon.

Yes, work is in progress to get the drm_hwcomposer integrated, however note that we don't have access to any info about the hardware accelerated composition, so its still all done on the gpu.

I see that efforts are still focused on android-hikey-linaro-4.9, which is a bit disappointing. Backporting again are we?

Work is in progress transitioning to the recently released android-4.14 kernel (as well as continued upstreaming to mainline), however performance is not yet optimized so its not ready for general use.

A 4.15-rc branch can be found here, but again, graphical performance and EAS integration isn't yet in place. https://git.linaro.org/people/john.stultz/android-dev.git/log/?h=dev/hikey96...

Currently I am using tip on AOSP and android-hikey-linaro-4.9. What (and where) is the status for vr-mode with hw support for hiKey960? Anyone knows more about this?

Sahaj has done some work with VR, so he might be able to share details.

thanks -john