[PATCH 08/13] drm/i915: treat no fb -> fb as simple flip instead of full mode set

[Jesse Barnes <jbarnes@virtuousgeek.org>]

In case we don't get an fb from the BIOS, we may still be able to re-use
existing state and flip a new buffer.

Jesse: Do we want a macro for "no mode set" or just a new check for crtc->active here?

Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
---
 drivers/gpu/drm/i915/intel_display.c |    4 +---
 1 file changed, 1 insertion(+), 3 deletions(-)

diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
index 0f3c036..f24da1a 100644
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -8109,10 +8109,8 @@ intel_set_config_compute_mode_changes(struct drm_mode_set *set,
 	/* We should be able to check here if the fb has the same properties
 	 * and then just flip_or_move it */
 	if (set->crtc->fb != set->fb) {
-		/* If we have no fb then treat it as a full mode set */
 		if (set->crtc->fb == NULL) {
-			DRM_DEBUG_KMS("crtc has no fb, full mode set\n");
-			config->mode_changed = true;
+			config->fb_changed = true;
 		} else if (set->fb == NULL) {
 			config->mode_changed = true;
 		} else if (set->fb->depth != set->crtc->fb->depth) {
-- 
1.7.9.5