From: Ville Syrjälä <ville.syrjala@linux.intel.com>
Date: Thu, 7 Sep 2023 12:25:41 +0000 (+0300)
Subject: drm/i915: Do plane/etc. updates more atomically across pipes
X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=c610e841f19d57233062868f2408349e9ecade91;p=linux.git

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 <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20230907122541.32261-4-ville.syrjala@linux.intel.com
Reviewed-by: Stanislav Lisovskiy <stanislav.lisovskiy@intel.com>
---

diff --git a/drivers/gpu/drm/i915/display/intel_display.c b/drivers/gpu/drm/i915/display/intel_display.c
index bedd338ee9be1..3effafcbb411a 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);
 
 			/*
@@ -7044,6 +7058,15 @@ static void skl_commit_modeset_enables(struct intel_atomic_state *state)
 	/*
 	 * Finally we do the plane updates/etc. for all pipes that got enabled.
 	 */
+	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);
+	}
+
 	for_each_new_intel_crtc_in_state(state, crtc, new_crtc_state, i) {
 		enum pipe pipe = crtc->pipe;
 
@@ -7056,7 +7079,6 @@ 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);
 	}