Hey Robert, thank you for the reply.
2017-09-22 23:43 GMT+08:00 Robert Foss robert.foss@collabora.com:
Hey Chih-Wei, On Fri, 2017-09-22 at 10:40 +0800, Chih-Wei Huang wrote:
Great news! Thanks a lot to make it happen.
I hope I am wrong. From my understanding most x86 GPUs still cannot work with drm_hwcomposer since they lack of atomic mode-setting API support required by drm_hwcomposer. Hope this could be addressed soon since drm_hwcomposer becomes a standard project of fd.o.
I haven't personally run drm_hwc ontop of any x86 hardware, but there are people who do it.
Indeed we (android-x86 project) are the people who try to use it but without lucky. Rob Herring also uses (a slightly modified) drm_hwcomposer with his aosp virgl porting. Except these I don't know any others use it on x86 hardware. Though drm_hwcomposer is developed from Chromium but I've heard Chrome actually use an alternative proprietary hwcomposer in their Android Runtime for Chrome (ARC).
The android-ia project has supported using drm_hwcomposer and an alternative hwcomposer, so it would think there should be no issues.
By x86 GPUs, I meant i915(i965)/nouveau/radeon/amdgpu/virgl/vmwgfx. Among these only virgl works with the current drm_hwcomposer. All the others don't have a ready atomic mode-setting API to use it. That's the problem which should be addressed I meant.
The android-ia doesn't support using fdo's drm_hwcomposer I think. They use an alternative hwcomposer [1] as you said. It looks very different than drm_hwcomposer though both rely on the similar (or same?) atomic API. Android-ia's kernel has also been patched to work with it. The vanilla kernel (at least LTS 4.9) can't work with [1] or drm_hwcomposer. Actually [1] only works with i915(i965) but we want a more generic hwcomposer like drm_hwcomposer.
Please correct me if I am wrong.
[1]: git://github.com/01org/IA-Hardware-Composer
How about the gralloc? There are also several implementations scattered somewhere. I think it's also important to standardize it to fd.o and make it work with fd.o's drm_hwcomposer.
Gralloc is a different story, and the right person to ask about it is not me, but maybe Rob Herring.