On Fri, Mar 07, 2014 at 06:32:30PM +0200, ville.syrjala@xxxxxxxxxxxxxxx wrote: > From: Ville Syrjälä <ville.syrjala@xxxxxxxxxxxxxxx> > > ILK and IVB don't like switching between sprite only and primary only > configurations when LP1+ watermarks have been enabled in the recent > past. Like WaCxSRDisabledForSpriteScaling we can avoid the flash > by disabling LP1+ watermarks for one frame before the critical plane > reconfiguration. > > Signed-off-by: Ville Syrjälä <ville.syrjala@xxxxxxxxxxxxxxx> > --- > drivers/gpu/drm/i915/intel_pm.c | 9 +++++++++ > 1 file changed, 9 insertions(+) > > diff --git a/drivers/gpu/drm/i915/intel_pm.c b/drivers/gpu/drm/i915/intel_pm.c > index ddf77d5..c011da5 100644 > --- a/drivers/gpu/drm/i915/intel_pm.c > +++ b/drivers/gpu/drm/i915/intel_pm.c > @@ -3127,9 +3127,18 @@ static int ilk_update_sprite_wm(struct drm_plane *plane, > * when scaling is disabled. > * > * WaCxSRDisabledForSpriteScaling:ivb > + * > + * We also seem to need something similar when switching between > + * primary only and sprite only configurations. Otherwise the screen > + * flashes black. No underrun reported though. > */ > if (IS_IVYBRIDGE(dev) && config->spr.scaled && ilk_disable_lp_wm(crtc)) > intel_wait_for_vblank(dev, to_intel_plane(plane)->pipe); > + else if (config->pri.enabled != config->spr.enabled && > + config->pri.enabled != params.pri.enabled && > + config->spr.enabled != params.spr.enabled && > + ilk_disable_lp_wm(crtc)) I think it would help readability a bit to extract this monster condition into a tiny helper with descriptive name ... just my bikeshed of the day. -Daniel > + intel_wait_for_vblank(dev, to_intel_plane(plane)->pipe); > > params.pri = config->pri; > params.spr = config->spr; > -- > 1.8.3.2 > > _______________________________________________ > Intel-gfx mailing list > Intel-gfx@xxxxxxxxxxxxxxxxxxxxx > http://lists.freedesktop.org/mailman/listinfo/intel-gfx -- Daniel Vetter Software Engineer, Intel Corporation +41 (0) 79 365 57 48 - http://blog.ffwll.ch _______________________________________________ Intel-gfx mailing list Intel-gfx@xxxxxxxxxxxxxxxxxxxxx http://lists.freedesktop.org/mailman/listinfo/intel-gfx
