On Thu, 19 Dec 2013 19:12:31 -0200 Paulo Zanoni <przanoni@xxxxxxxxx> wrote: > From: Paulo Zanoni <paulo.r.zanoni@xxxxxxxxx> > > When I forked haswell_crtc_enable I copied all the code from > ironlake_crtc_enable. The last piece of the function contains a big > comment with a call to intel_wait_for_vblank. After this fork, we > rearranged the Haswell code so that it enables the planes as the very > last step of the modeset sequence, so we're sure that we call > intel_enable_primary_plane after the pipe is really running, so the > vblank waiting functions work as expected. I really believe this is > what fixes the problem described by the big comment, so let's give it > a try and get rid of that intel_wait_for_vblank, saving around 16ms > per modeset (and init/resume). We can always revert if needed :) > > Signed-off-by: Paulo Zanoni <paulo.r.zanoni@xxxxxxxxx> > --- > drivers/gpu/drm/i915/intel_display.c | 10 ---------- > 1 file changed, 10 deletions(-) > > diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c > index f0f78d3..4f933f2 100644 > --- a/drivers/gpu/drm/i915/intel_display.c > +++ b/drivers/gpu/drm/i915/intel_display.c > @@ -3720,16 +3720,6 @@ static void haswell_crtc_enable(struct drm_crtc *crtc) > * to change the workaround. */ > haswell_mode_set_planes_workaround(intel_crtc); > haswell_crtc_enable_planes(crtc); > - > - /* > - * There seems to be a race in PCH platform hw (at least on some > - * outputs) where an enabled pipe still completes any pageflip right > - * away (as if the pipe is off) instead of waiting for vblank. As soon > - * as the first vblank happend, everything works as expected. Hence just > - * wait for one vblank before returning to avoid strange things > - * happening. > - */ > - intel_wait_for_vblank(dev, intel_crtc->pipe); > } > > static void ironlake_pfit_disable(struct intel_crtc *crtc) Yeah, really seems like this is taken care of by the earlier bits... Reviewed-by: Jesse Barnes <jbarnes@xxxxxxxxxxxxxxxx> -- Jesse Barnes, Intel Open Source Technology Center _______________________________________________ Intel-gfx mailing list Intel-gfx@xxxxxxxxxxxxxxxxxxxxx http://lists.freedesktop.org/mailman/listinfo/intel-gfx
