sna: Force use of per-crtc scanout if the offset is too large

On gen4+, the scanout offset into a tiled surface is specified through
the DSPTILEOFF register and limited to 12bits of precision. So if we
have a CRTC positioned in that nether-region, we need to allocate a
separate per-crtc pixmap for it and perform shadowing.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>

1 files changed, 1 insertions, 0 deletions

diff --git a/src/sna/sna.h b/src/sna/sna.h
index 2e8925b7..d4cb42f6 100644
--- a/src/sna/sna.h
+++ b/src/sna/sna.h
@@ -234,6 +234,7 @@ struct sna {
 
 	struct sna_mode {
 		drmModeResPtr kmode;
+		int max_tile_offset;
 
 		int shadow_active;
 		DamagePtr shadow_damage;