drm/i915/psr: Disable PSR when bigjoiner is used

Bigjoiner seem to be causing all kinds of grief to the PSR
code currently. I don't believe there is any hardware issue
but the code simply not handling this correctly. For now
just disable PSR when bigjoiner is needed.

Cc: stable@vger.kernel.org
Link: https://patchwork.freedesktop.org/patch/msgid/20240404213441.17637-3-ville.syrjala@linux.intel.comReviewed-by: Arun R Murthy <arun.r.mruthy@intel.com>
Acked-by: Jouni Högander <jouni.hogander@intel.com>
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>

drivers/gpu/drm/i915/display/intel_psr.c

@@ -1619,6 +1619,17 @@ void intel_psr_compute_config(struct intel_dp *intel_dp,
 		return;
 	}
 
+	/*
+	 * FIXME figure out what is wrong with PSR+bigjoiner and
+	 * fix it. Presumably something related to the fact that
+	 * PSR is a transcoder level feature.
+	 */
+	if (crtc_state->bigjoiner_pipes) {
+		drm_dbg_kms(&dev_priv->drm,
+			    "PSR disabled due to bigjoiner\n");
+		return;
+	}
+
 	if (CAN_PANEL_REPLAY(intel_dp))
 		crtc_state->has_panel_replay = true;