drm/i915: Do plane/etc. updates more atomically across pipes

Perform all the intel_pre_update_crtc() stuff for all pipes first,
and only then do the intel_update_crtc() vblank evasion stuff for
every pipe back to back. This should make it more likely that
the plane updates from multiple pipes happen on the same frame
(assuming the pipes are running in sync, eg. due to bigjoiner
or port sync).

Signed-off-by: Ville Syrjälä <[email protected]>
Link: https://patchwork.freedesktop.org/patch/msgid/[email protected]
Reviewed-by: Stanislav Lisovskiy <[email protected]>

1 files changed, 24 insertions, 2 deletions

diff --git a/drivers/gpu/drm/i915/display/intel_display.c b/drivers/gpu/drm/i915/display/intel_display.c
index bedd338ee9be..3effafcbb411 100644
--- a/drivers/gpu/drm/i915/display/intel_display.c
+++ b/drivers/gpu/drm/i915/display/intel_display.c
@@ -6936,6 +6936,12 @@ static void intel_commit_modeset_enables(struct intel_atomic_state *state)
 
 		intel_enable_crtc(state, crtc);
 		intel_pre_update_crtc(state, crtc);
+	}
+
+	for_each_new_intel_crtc_in_state(state, crtc, new_crtc_state, i) {
+		if (!new_crtc_state->hw.active)
+			continue;
+
 		intel_update_crtc(state, crtc);
 	}
 }
@@ -6973,6 +6979,15 @@ static void skl_commit_modeset_enables(struct intel_atomic_state *state)
 	 * So first lets enable all pipes that do not need a fullmodeset as
 	 * those don't have any external dependency.
 	 */
+	for_each_new_intel_crtc_in_state(state, crtc, new_crtc_state, i) {
+		enum pipe pipe = crtc->pipe;
+
+		if ((update_pipes & BIT(pipe)) == 0)
+			continue;
+
+		intel_pre_update_crtc(state, crtc);
+	}
+
 	while (update_pipes) {
 		for_each_oldnew_intel_crtc_in_state(state, crtc, old_crtc_state,
 						    new_crtc_state, i) {
@@ -6988,7 +7003,6 @@ static void skl_commit_modeset_enables(struct intel_atomic_state *state)
 			entries[pipe] = new_crtc_state->wm.skl.ddb;
 			update_pipes &= ~BIT(pipe);
 
-			intel_pre_update_crtc(state, crtc);
 			intel_update_crtc(state, crtc);
 
 			/*
@@ -7050,13 +7064,21 @@ static void skl_commit_modeset_enables(struct intel_atomic_state *state)
 		if ((update_pipes & BIT(pipe)) == 0)
 			continue;
 
+		intel_pre_update_crtc(state, crtc);
+	}
+
+	for_each_new_intel_crtc_in_state(state, crtc, new_crtc_state, i) {
+		enum pipe pipe = crtc->pipe;
+
+		if ((update_pipes & BIT(pipe)) == 0)
+			continue;
+
 		drm_WARN_ON(&dev_priv->drm, skl_ddb_allocation_overlaps(&new_crtc_state->wm.skl.ddb,
 									entries, I915_MAX_PIPES, pipe));
 
 		entries[pipe] = new_crtc_state->wm.skl.ddb;
 		update_pipes &= ~BIT(pipe);
 
-		intel_pre_update_crtc(state, crtc);
 		intel_update_crtc(state, crtc);
 	}