sync with OpenBSD -current

sys/dev/pci/drm/i915/display/intel_cdclk.c

@@ -2368,6 +2368,18 @@ static int intel_compute_min_cdclk(struct intel_cdclk_state *cdclk_state)
 	for_each_pipe(dev_priv, pipe)
 		min_cdclk = max(cdclk_state->min_cdclk[pipe], min_cdclk);
 
+	/*
+	 * Avoid glk_force_audio_cdclk() causing excessive screen
+	 * blinking when multiple pipes are active by making sure
+	 * CDCLK frequency is always high enough for audio. With a
+	 * single active pipe we can always change CDCLK frequency
+	 * by changing the cd2x divider (see glk_cdclk_table[]) and
+	 * thus a full modeset won't be needed then.
+	 */
+	if (IS_GEMINILAKE(dev_priv) && cdclk_state->active_pipes &&
+	    !is_power_of_2(cdclk_state->active_pipes))
+		min_cdclk = max(2 * 96000, min_cdclk);
+
 	if (min_cdclk > dev_priv->display.cdclk.max_cdclk_freq) {
 		drm_dbg_kms(&dev_priv->drm,
 			    "required cdclk (%d kHz) exceeds max (%d kHz)\n",