From 1ed1f968b6bec3a8fbeb99b796854f63bdffc558 Mon Sep 17 00:00:00 2001 From: Matt Roper Date: Fri, 30 Jan 2015 16:22:36 -0800 Subject: [PATCH] drm/i915: Keep plane->state updated on pageflip Until all drivers have transitioned to atomic, the framebuffer associated with a plane is tracked in both plane->fb (for legacy) and plane->state->fb (for all the new atomic codeflow). All of our modeset and plane updates use drm_plane->update_plane(), so in theory plane->fb and plane->state->fb should always stay in sync and point at the same thing for i915. However we forgot about the pageflip ioctl case, which currently only updates plane->fb and leaves plane->state->fb at a stale value. Surprisingly, this doesn't cause any real problems at the moment since internally we use the plane->fb pointer in most of the places that matter, and on the next .update_plane() call, we use plane->fb to figure out which framebuffer to cleanup. However when we switch to the full atomic helpers for update_plane()/disable_plane(), those helpers use plane->state->fb to figure out which framebuffer to cleanup, so not having updated the plane->state->fb pointer causes things to blow up following a pageflip ioctl. The fix here is to just make sure we update plane->state->fb at the same time we update plane->fb in the pageflip ioctl. Signed-off-by: Matt Roper Signed-off-by: Daniel Vetter --- drivers/gpu/drm/i915/intel_display.c | 7 +++++++ 1 file changed, 7 insertions(+) diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c index 3d220a67f865..08e2bab6ef47 100644 --- a/drivers/gpu/drm/i915/intel_display.c +++ b/drivers/gpu/drm/i915/intel_display.c @@ -9801,6 +9801,13 @@ static int intel_crtc_page_flip(struct drm_crtc *crtc, crtc->primary->fb = fb; + /* Keep state structure in sync */ + if (crtc->primary->state->fb) + drm_framebuffer_unreference(crtc->primary->state->fb); + crtc->primary->state->fb = fb; + if (crtc->primary->state->fb) + drm_framebuffer_reference(crtc->primary->state->fb); + work->pending_flip_obj = obj; atomic_inc(&intel_crtc->unpin_work_count); -- 2.20.1