On Thu, Jul 14, 2016 at 05:11:38PM +0200, Stefan Christ wrote: > Hi Daniel, > > On Wed, Jul 13, 2016 at 12:00:07PM +0200, Daniel Vetter wrote: > > On Wed, Jul 13, 2016 at 10:11:45AM +0200, Stefan Christ wrote: > > > Hi, > > > > > > im currently working on supporting double/tripple buffering for the framebuffer > > > emulation on the i.MX6. While working on it I noticed that the mainline kernel > > > does not support some features in the generic drm framebuffer emulation for > > > framebuffer panning and vsync synchronisation. They are needed for simple > > > framebuffer applications and some OpenGL libraries using double buffering with > > > FBIOPUT_VSCREENINFO, FBIO_WAITFORVSYNC and FBIOPAN_DISPLAY. > > > > > > Any comments? > > > > Don't ever do OpenGL on fbdev. Ever. The fbdev emulation we have is to > > support boot splashs, kernel console, oopses and legacy applications that > > just love fbdev too much and don't support native kms dumb buffers. > > > > Anything that goes beyond kms dumb buffers (like displaying buffers > > rendered through opengl) is imo a complete no-go. Yes Android loves to do > > that, but for upstream we need a proper drm render driver, buffer sharing > > through prime and the userspace hwcomposer needs to use native drm kms > > ioctls. Also, userspace (especially the opengl part) needs to be open > > source for upstream. > > Yeah, these closed libraries are kind of ugly, but implementing these features > maybe interesting for legacy framebuffer applications that do double buffering > via panning. > > Thanks for the comments. I totally overlooked the dpms/blank and locking issue. > I will work through them and send v2 patches. In case it wasn't obvious: Don't sell this with "makes blob opengl drivers work". Find some old userspace that uses raw fbdev, sell this patch series using that one ;-) -Daniel > > Mit freundlichen Grüßen / Kind regards, > Stefan Christ > > > > > Thanks, Daniel > > > > > > Kind regards, > > > Stefan Christ > > > > > > Stefan Christ (2): > > > drm: fb_helper: implement ioctl FBIO_WAITFORVSYNC > > > drm/imx: ipuv3-crtc: implement fast path mode_set_base > > > > > > Xinliang Liu (1): > > > drm/cma-helper: Add multi buffer support for cma fbdev > > > > > > drivers/gpu/drm/Kconfig | 8 +++++++ > > > drivers/gpu/drm/drm_fb_cma_helper.c | 9 +++++++- > > > drivers/gpu/drm/drm_fb_helper.c | 43 +++++++++++++++++++++++++++++++++++++ > > > drivers/gpu/drm/imx/ipuv3-crtc.c | 10 +++++++++ > > > include/drm/drm_fb_helper.h | 2 ++ > > > 5 files changed, 71 insertions(+), 1 deletion(-) > > > > > > -- > > > 1.9.1 > > > > > > _______________________________________________ > > > dri-devel mailing list > > > dri-devel@xxxxxxxxxxxxxxxxxxxxx > > > https://lists.freedesktop.org/mailman/listinfo/dri-devel > > > > -- > > Daniel Vetter > > Software Engineer, Intel Corporation > > http://blog.ffwll.ch -- Daniel Vetter Software Engineer, Intel Corporation http://blog.ffwll.ch _______________________________________________ dri-devel mailing list dri-devel@xxxxxxxxxxxxxxxxxxxxx https://lists.freedesktop.org/mailman/listinfo/dri-devel
