On Tue, Aug 20, 2013 at 01:39:02PM +0100, Chris Wilson wrote: > On Tue, Aug 20, 2013 at 02:31:03PM +0200, Daniel Vetter wrote: > > On Tue, Aug 20, 2013 at 10:34 AM, Chris Wilson <chris@xxxxxxxxxxxxxxxxxx> wrote: > > > RCS flips do work on Iybridge+ so long as we can unmask the messages > > > through DERRMR. However, there are quite a few workarounds mentioned > > > regarding unmasking more than one event or triggering more than one > > > message through DERRMR. Those workarounds in principle prevent us from > > > performing pipelined flips (and asynchronous flips across multiple > > > planes) and equally apply to the "known good" BCS ring. Given that it > > > already appears to work, and also appears to work with unmasking all 3 > > > planes at once (and queuing flips across multiple planes), be brave. > > > > > > Bugzlla: https://bugs.freedesktop.org/show_bug.cgi?id=67600 > > > Signed-off-by: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx> > > > > Can you pls add some words with how this DERRMR write will interact > > with scanline waits from SNA? I think just a few words to explain how > > switching from scanline waits and blits to pageflips and back would be > > good (even though I don't really expect that to happen often, > > especially now that we have the buffer age extension and friends). > > The DERRMR is overwritten by each before use. I thought that was > self-explanatory. The not-so-self-explanatory part is that there is a implicit synchronisation point in userspace between switching between flips and scanlines. -Chris -- Chris Wilson, Intel Open Source Technology Centre _______________________________________________ Intel-gfx mailing list Intel-gfx@xxxxxxxxxxxxxxxxxxxxx http://lists.freedesktop.org/mailman/listinfo/intel-gfx
