From: jsg <jsg@openbsd.org>
Date: Mon, 29 Apr 2024 06:23:20 +0000 (+0000)
Subject: drm/i915: Disable live M/N updates when using bigjoiner
X-Git-Url: http://artulab.com/gitweb/?a=commitdiff_plain;h=da099fe52eff81738102f312810efeac88803211;p=openbsd

drm/i915: Disable live M/N updates when using bigjoiner

From Ville Syrjala
9d106175b7a081f98112694e7fbb82105aff4eef in linux-6.6.y/6.6.29
4a36e46df7aa781c756f09727d37dc2783f1ee75 in mainline linux
---

diff --git a/sys/dev/pci/drm/i915/display/intel_dp.c b/sys/dev/pci/drm/i915/display/intel_dp.c
index a972efa0336..f32ec5ca378 100644
--- a/sys/dev/pci/drm/i915/display/intel_dp.c
+++ b/sys/dev/pci/drm/i915/display/intel_dp.c
@@ -2148,7 +2148,11 @@ intel_dp_drrs_compute_config(struct intel_connector *connector,
 		intel_panel_downclock_mode(connector, &pipe_config->hw.adjusted_mode);
 	int pixel_clock;
 
-	if (has_seamless_m_n(connector))
+	/*
+	 * FIXME all joined pipes share the same transcoder.
+	 * Need to account for that when updating M/N live.
+	 */
+	if (has_seamless_m_n(connector) && !pipe_config->bigjoiner_pipes)
 		pipe_config->update_m_n = true;
 
 	if (!can_enable_drrs(connector, pipe_config, downclock_mode)) {