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)) + 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
