sna: Handle wedged devices during sna_crtc_redisplay

If the device is already wedged (no GPU), jump straight to the swrast
path for performing the per-crtc transformations.

Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=105420

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

src/sna/sna_display.c

@@ -8816,7 +8816,8 @@ sna_crtc_redisplay(xf86CrtcPtr crtc, RegionPtr region, struct kgem_bo *bo)
 	     region->extents.x2, region->extents.y2,
 	     region_num_rects(region)));
 
-	assert(!wedged(sna));
+	if (wedged(sna))
+		goto fallback;
 
 	if (priv->clear) {
 		RegionRec whole;
@@ -8861,9 +8862,12 @@ sna_crtc_redisplay(xf86CrtcPtr crtc, RegionPtr region, struct kgem_bo *bo)
 			return;
 	}
 
-	if (can_render(sna))
+	if (can_render(sna)) {
 		sna_crtc_redisplay__composite(crtc, region, bo);
-	else
+		return;
+	}
+
+fallback:
 	sna_crtc_redisplay__fallback(crtc, region, bo);
 }