[Intel-gfx] [PATCH 02/15] drm/i915: Handle cursor updating active_planes correctly.

[Maarten Lankhorst]

While we may not update new_crtc_state, we may clear active_planes
if the new cursor update state will disable the cursor, but we fail
after. If this is immediately followed by a modeset disable, we may
soon not disable the planes correctly when we start depending on
active_planes.

Signed-off-by: Maarten Lankhorst <maarten.lankhorst at linux.intel.com>
---
 drivers/gpu/drm/i915/intel_display.c | 25 +++++++++++++++++--------
 1 file changed, 17 insertions(+), 8 deletions(-)

diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
index 2ac381eb8103..7a7ff1d76031 100644
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -13517,14 +13517,16 @@ intel_legacy_cursor_update(struct drm_plane *plane,
 	struct drm_plane_state *old_plane_state, *new_plane_state;
 	struct intel_plane *intel_plane = to_intel_plane(plane);
 	struct drm_framebuffer *old_fb;
-	struct drm_crtc_state *crtc_state = crtc->state;
+	struct intel_crtc_state *crtc_state =
+		to_intel_crtc_state(crtc->state);
+	struct intel_crtc_state *new_crtc_state;
 
 	/*
 	 * When crtc is inactive or there is a modeset pending,
 	 * wait for it to complete in the slowpath
 	 */
-	if (!crtc_state->active || needs_modeset(crtc_state) ||
-	    to_intel_crtc_state(crtc_state)->update_pipe)
+	if (!crtc_state->base.active || needs_modeset(&crtc_state->base) ||
+	    crtc_state->update_pipe)
 		goto slow;
 
 	old_plane_state = plane->state;
@@ -13554,6 +13556,12 @@ intel_legacy_cursor_update(struct drm_plane *plane,
 	if (!new_plane_state)
 		return -ENOMEM;
 
+	new_crtc_state = to_intel_crtc_state(intel_crtc_duplicate_state(crtc));
+	if (!new_crtc_state) {
+		ret = -ENOMEM;
+		goto out_free;
+	}
+
 	drm_atomic_set_fb_for_plane(new_plane_state, fb);
 
 	new_plane_state->src_x = src_x;
@@ -13565,9 +13573,8 @@ intel_legacy_cursor_update(struct drm_plane *plane,
 	new_plane_state->crtc_w = crtc_w;
 	new_plane_state->crtc_h = crtc_h;
 
-	ret = intel_plane_atomic_check_with_state(to_intel_crtc_state(crtc->state),
-						  to_intel_crtc_state(crtc->state), /* FIXME need a new crtc state? */
-						  to_intel_plane_state(plane->state),
+	ret = intel_plane_atomic_check_with_state(crtc_state, new_crtc_state,
+						  to_intel_plane_state(old_plane_state),
 						  to_intel_plane_state(new_plane_state));
 	if (ret)
 		goto out_free;
@@ -13588,11 +13595,11 @@ intel_legacy_cursor_update(struct drm_plane *plane,
 
 	/* Swap plane state */
 	plane->state = new_plane_state;
+	crtc_state->active_planes = new_crtc_state->active_planes;
 
 	if (plane->state->visible) {
 		trace_intel_update_plane(plane, to_intel_crtc(crtc));
-		intel_plane->update_plane(intel_plane,
-					  to_intel_crtc_state(crtc->state),
+		intel_plane->update_plane(intel_plane, crtc_state,
 					  to_intel_plane_state(plane->state));
 	} else {
 		trace_intel_disable_plane(plane, to_intel_crtc(crtc));
@@ -13604,6 +13611,8 @@ intel_legacy_cursor_update(struct drm_plane *plane,
 out_unlock:
 	mutex_unlock(&dev_priv->drm.struct_mutex);
 out_free:
+	if (new_crtc_state)
+		intel_crtc_destroy_state(crtc, &new_crtc_state->base);
 	if (ret)
 		intel_plane_destroy_state(plane, new_plane_state);
 	else
-- 
2.18.0