[PATCH 1/3] drm/i915: Precompute disable_pipes bitmask in intel_commit_modeset_disables()

[Ville Syrjala <ville.syrjala@linux.intel.com>]

From: Ville Syrjälä <ville.syrjala@linux.intel.com>

Copy the pipe bitmask based approach skl_commit_modeset_enables()
into intel_commit_modeset_disables(). This avoids doing so many
duplicated checks in all the loops, and also let's us WARN at the
end if we screwed up somewhere and forgot to disable some pipe.

Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
---
 drivers/gpu/drm/i915/display/intel_display.c | 27 ++++++++++++--------
 1 file changed, 16 insertions(+), 11 deletions(-)

diff --git a/drivers/gpu/drm/i915/display/intel_display.c b/drivers/gpu/drm/i915/display/intel_display.c
index ab2f52d21bad..d1c947a310a3 100644
--- a/drivers/gpu/drm/i915/display/intel_display.c
+++ b/drivers/gpu/drm/i915/display/intel_display.c
@@ -6768,9 +6768,10 @@ static void intel_old_crtc_state_disables(struct intel_atomic_state *state,
 
 static void intel_commit_modeset_disables(struct intel_atomic_state *state)
 {
+	struct drm_i915_private *i915 = to_i915(state->base.dev);
 	struct intel_crtc_state *new_crtc_state, *old_crtc_state;
 	struct intel_crtc *crtc;
-	u32 handled = 0;
+	u8 disable_pipes = 0;
 	int i;
 
 	for_each_oldnew_intel_crtc_in_state(state, crtc, old_crtc_state,
@@ -6778,21 +6779,24 @@ static void intel_commit_modeset_disables(struct intel_atomic_state *state)
 		if (!intel_crtc_needs_modeset(new_crtc_state))
 			continue;
 
+		/*
+		 * Needs to be done even for pipes
+		 * that weren't enabled previously.
+		 */
 		intel_pre_plane_update(state, crtc);
 
 		if (!old_crtc_state->hw.active)
 			continue;
 
 		intel_crtc_disable_planes(state, crtc);
+
+		disable_pipes |= BIT(crtc->pipe);
 	}
 
 	/* Only disable port sync and MST slaves */
 	for_each_oldnew_intel_crtc_in_state(state, crtc, old_crtc_state,
 					    new_crtc_state, i) {
-		if (!intel_crtc_needs_modeset(new_crtc_state))
-			continue;
-
-		if (!old_crtc_state->hw.active)
+		if ((disable_pipes & BIT(crtc->pipe)) == 0)
 			continue;
 
 		/* In case of Transcoder port Sync master slave CRTCs can be
@@ -6807,22 +6811,23 @@ static void intel_commit_modeset_disables(struct intel_atomic_state *state)
 
 		intel_old_crtc_state_disables(state, old_crtc_state,
 					      new_crtc_state, crtc);
-		handled |= BIT(crtc->pipe);
+
+		disable_pipes &= ~BIT(crtc->pipe);
 	}
 
 	/* Disable everything else left on */
 	for_each_oldnew_intel_crtc_in_state(state, crtc, old_crtc_state,
 					    new_crtc_state, i) {
-		if (!intel_crtc_needs_modeset(new_crtc_state) ||
-		    (handled & BIT(crtc->pipe)))
-			continue;
-
-		if (!old_crtc_state->hw.active)
+		if ((disable_pipes & BIT(crtc->pipe)) == 0)
 			continue;
 
 		intel_old_crtc_state_disables(state, old_crtc_state,
 					      new_crtc_state, crtc);
+
+		disable_pipes &= ~BIT(crtc->pipe);
 	}
+
+	drm_WARN_ON(&i915->drm, disable_pipes);
 }
 
 static void intel_commit_modeset_enables(struct intel_atomic_state *state)
-- 
2.43.0