[Intel-gfx] [PATCH v2 10/11] drm/i915/display: Check if pipe fastset is allowed by external dependencies

["José Roberto de Souza" <jose.souza@intel.com>]

Check if fastset is allowed by external dependencies like other pipes
and transcoders.

Right now it only forces a fullmodeset when the MST master transcoder
did not changed but the pipe of the master transcoder needs a
fullmodeset so all slaves also needs to do a fullmodeset.
But it will probably be need for port sync as well.

Cc: Ville Syrjälä <ville.syrjala@linux.intel.com>
Cc: Lucas De Marchi <lucas.demarchi@intel.com>
Cc: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
Cc: Manasi Navare <manasi.d.navare@intel.com>
Signed-off-by: José Roberto de Souza <jose.souza@intel.com>
---
 drivers/gpu/drm/i915/display/intel_display.c | 41 ++++++++++++++++++++
 1 file changed, 41 insertions(+)

diff --git a/drivers/gpu/drm/i915/display/intel_display.c b/drivers/gpu/drm/i915/display/intel_display.c
index 4dc48e79d14b..9729f0b299b3 100644
--- a/drivers/gpu/drm/i915/display/intel_display.c
+++ b/drivers/gpu/drm/i915/display/intel_display.c
@@ -13930,11 +13930,52 @@ static int calc_watermark_data(struct intel_atomic_state *state)
 	return 0;
 }
 
+/**
+ * Check if fastset is allowed by external dependencies like other pipes and
+ * transcoders.
+ *
+ * Right now it only forces a fullmodeset when the MST master transcoder did
+ * not changed but the pipe of the master transcoder needs a fullmodeset so
+ * all slaves also needs to do a fullmodeset.
+ */
+static bool
+intel_crtc_check_external_dependencies_fastset(const struct intel_crtc_state *old_crtc_state,
+					       struct intel_crtc_state *new_crtc_state)
+{
+	struct intel_atomic_state *state = to_intel_atomic_state(new_crtc_state->uapi.state);
+	struct drm_i915_private *dev_priv = to_i915(new_crtc_state->uapi.crtc->dev);
+	struct intel_crtc_state *new_crtc_state_iter;
+	struct intel_crtc *crtc_iter;
+	int i;
+
+	if (INTEL_GEN(dev_priv) < 12)
+		return true;
+
+	if (!intel_crtc_has_type(old_crtc_state, INTEL_OUTPUT_DP_MST) ||
+	    intel_dp_mst_is_master_trans(new_crtc_state))
+		return true;
+
+	for_each_new_intel_crtc_in_state(state, crtc_iter, new_crtc_state_iter, i) {
+		if (new_crtc_state_iter->cpu_transcoder !=
+		    new_crtc_state->mst_master_transcoder)
+			continue;
+
+		return !needs_modeset(new_crtc_state_iter);
+	}
+
+	DRM_ERROR("Master MST transcoder of pipe not found\n");
+	return false;
+}
+
 static void intel_crtc_check_fastset(const struct intel_crtc_state *old_crtc_state,
 				     struct intel_crtc_state *new_crtc_state)
 {
 	if (!intel_pipe_config_compare(old_crtc_state, new_crtc_state, true))
 		return;
+	if (!intel_crtc_check_external_dependencies_fastset(old_crtc_state,
+							    new_crtc_state))
+		return;
+
 
 	new_crtc_state->uapi.mode_changed = false;
 	new_crtc_state->update_pipe = true;
-- 
2.24.0

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