Automatically try re-enabling TearFree after a flip failed

Specifically, after both the page flip and vblank ioctls failed, but
then the vblank ioctl started working again. This can happen
intermittently e.g. when hotplugging a DP display. Previously, TearFree
would stay disabled in that case until a modeset was triggered somehow.

Bugzilla: https://bugs.freedesktop.org/103791
(Ported from amdgpu commit bcfa6c258fdf41a9928f8a3c78fc528d0fafee25)

1 files changed, 7 insertions, 0 deletions

diff --git a/src/drmmode_display.h b/src/drmmode_display.h
index bfc13010..f5659664 100644
--- a/src/drmmode_display.h
+++ b/src/drmmode_display.h
@@ -71,6 +71,12 @@ struct drmmode_fb {
 	uint32_t handle;
 };
 
+enum drmmode_scanout_status {
+    DRMMODE_SCANOUT_OK,
+    DRMMODE_SCANOUT_FLIP_FAILED = 1u << 0,
+    DRMMODE_SCANOUT_VBLANK_FAILED = 1u << 1,
+};
+
 struct drmmode_scanout {
     struct radeon_buffer *bo;
     PixmapPtr pixmap;
@@ -90,6 +96,7 @@ typedef struct {
     unsigned scanout_id;
     uintptr_t scanout_update_pending;
     Bool tear_free;
+    enum drmmode_scanout_status scanout_status;
 
     PixmapPtr prime_scanout_pixmap;