From: Ville Syrjälä <ville.syrjala@xxxxxxxxxxxxxxx> commit 5feba0e905c495a217aea9db4ea91093d8fe5dde upstream. We don't have a persistent fb holding a reference to the frontbuffer object, so every time we do the get+put we throw the frontbuffer object immediately away. And so the next time around we get a pristine frontbuffer object with bits==0 even for the old vma. This confuses the frontbuffer tracking code which understandably expects the old frontbuffer to have the overlay's bit set. Fix this by hanging on to the frontbuffer reference until the next flip. And just to make this a bit more clear let's track the frontbuffer explicitly instead of just grabbing it via the old vma. Cc: stable@xxxxxxxxxxxxxxx Cc: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx> Cc: Joonas Lahtinen <joonas.lahtinen@xxxxxxxxxxxxxxx> Closes: https://gitlab.freedesktop.org/drm/intel/-/issues/1136 Signed-off-by: Ville Syrjälä <ville.syrjala@xxxxxxxxxxxxxxx> Link: https://patchwork.freedesktop.org/patch/msgid/20210209021918.16234-2-ville.syrjala@xxxxxxxxxxxxxxx Fixes: 8e7cb1799b4f ("drm/i915: Extract intel_frontbuffer active tracking") Reviewed-by: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx> (cherry picked from commit 553c23bdb4775130f333f07a51b047276bc53f79) Signed-off-by: Jani Nikula <jani.nikula@xxxxxxxxx> Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> --- drivers/gpu/drm/i915/display/intel_overlay.c | 17 ++++++++--------- 1 file changed, 8 insertions(+), 9 deletions(-) --- a/drivers/gpu/drm/i915/display/intel_overlay.c +++ b/drivers/gpu/drm/i915/display/intel_overlay.c @@ -182,6 +182,7 @@ struct intel_overlay { struct intel_crtc *crtc; struct i915_vma *vma; struct i915_vma *old_vma; + struct intel_frontbuffer *frontbuffer; bool active; bool pfit_active; u32 pfit_vscale_ratio; /* shifted-point number, (1<<12) == 1.0 */ @@ -282,21 +283,19 @@ static void intel_overlay_flip_prepare(s struct i915_vma *vma) { enum pipe pipe = overlay->crtc->pipe; - struct intel_frontbuffer *from = NULL, *to = NULL; + struct intel_frontbuffer *frontbuffer = NULL; drm_WARN_ON(&overlay->i915->drm, overlay->old_vma); - if (overlay->vma) - from = intel_frontbuffer_get(overlay->vma->obj); if (vma) - to = intel_frontbuffer_get(vma->obj); + frontbuffer = intel_frontbuffer_get(vma->obj); - intel_frontbuffer_track(from, to, INTEL_FRONTBUFFER_OVERLAY(pipe)); + intel_frontbuffer_track(overlay->frontbuffer, frontbuffer, + INTEL_FRONTBUFFER_OVERLAY(pipe)); - if (to) - intel_frontbuffer_put(to); - if (from) - intel_frontbuffer_put(from); + if (overlay->frontbuffer) + intel_frontbuffer_put(overlay->frontbuffer); + overlay->frontbuffer = frontbuffer; intel_frontbuffer_flip_prepare(overlay->i915, INTEL_FRONTBUFFER_OVERLAY(pipe));
