On Fri, Mar 29, 2013 at 7:33 AM, Peter Hurley peter@hurleysoftware.com wrote:

On Thu, 2013-03-28 at 16:16 +0100, Maarten Lankhorst wrote:

...

Signed-off-by: Maarten Lankhorst maarten.lankhorst@canonical.com

Oops, fixed to apply this time..

diff --git a/drivers/gpu/drm/nouveau/nouveau_display.c b/drivers/gpu/drm/nouveau/nouveau_display.c index 4610c3a..020542e 100644 --- a/drivers/gpu/drm/nouveau/nouveau_display.c +++ b/drivers/gpu/drm/nouveau/nouveau_display.c @@ -593,7 +597,7 @@ nouveau_crtc_page_flip(struct drm_crtc *crtc, struct drm_framebuffer *fb,

  /* Emit a page flip */
  if (nv_device(drm->device)->card_type >= NV_50) {

•         ret = nv50_display_flip_next(crtc, fb, chan, 0);
  

•         ret = nv50_display_flip_next(crtc, fb, chan, 1);
  

Why would this work?

Because, when I added the code to support all this I kept it in mind and added a switch to use it.

Now. The reason I never switched this on is that (as I *already* mentioned in #nouveau to Maarten about another patch to enable vblank unconditionally in the DDX.......) we already have huge problems with memory bandwidth due to our cards usually starting up at low clock speeds. When I added page flipping support it made a huge difference to some games etc that were barely playable before.

So, it'd be really nice to be able to do this, yes. But, before I'll accept the patches a few things need to happen. I'd have done it before, but, I've always had higher priority things in the way (like, fixing the reclocking issue...)..

1. Fix the X server so that the page flipping path (dri2.c, line 1125) will be called even if theres no swap_interval set, this will allow page flipping to be used even in the absence of a sync-to-vblank request too. 2. Remove the GLXVBlank option from the nouveau ddx completely, default it to on. The application/user can now control it via other means anyway (drawable swap_interval). 3. Fix the DRM page flip ioctl to take a flag to request a non-vsync'd flip, and hook that bit up to the nv50_display_flip_next() call

I think that's everything... This will let us support both the speed improvements from flipping, and sync-to-vblank as the user chooses.

Ben.

...

          if (ret) {
                  mutex_unlock(&chan->cli->mutex);
                  goto fail_unreserve;

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