drm/i915/tc: Fix PHY ownership programming in HDMI legacy mode

Make sure the TypeC PHY ownership flag is not getting reset during
an HDMI modeset on the given port. Besides the WARN this triggered, it
didn't cause other issues, since for TypeC legacy mode setting the
PHY ownership flag is optional (there is no other user of the PHY
besides display).
Reported-and-tested-by: Shawn C Lee <shawn.c.lee@intel.com>
Signed-off-by: Imre Deak <imre.deak@intel.com>
Reviewed-by: Mika Kahola <mika.kahola@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20220726134313.1484763-1-imre.deak@intel.com

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

@@ -2866,6 +2866,8 @@ static void intel_enable_ddi_hdmi(struct intel_atomic_state *state,
 	struct intel_digital_port *dig_port = enc_to_dig_port(encoder);
 	struct drm_connector *connector = conn_state->connector;
 	enum port port = encoder->port;
+	enum phy phy = intel_port_to_phy(dev_priv, port);
+	u32 buf_ctl;
 
 	if (!intel_hdmi_handle_sink_scrambling(encoder, connector,
 					       crtc_state->hdmi_high_tmds_clock_ratio,
@@ -2923,8 +2925,12 @@ static void intel_enable_ddi_hdmi(struct intel_atomic_state *state,
 	 * On ADL_P the PHY link rate and lane count must be programmed but
 	 * these are both 0 for HDMI.
 	 */
-	intel_de_write(dev_priv, DDI_BUF_CTL(port),
-		       dig_port->saved_port_bits | DDI_BUF_CTL_ENABLE);
+	buf_ctl = dig_port->saved_port_bits | DDI_BUF_CTL_ENABLE;
+	if (IS_ALDERLAKE_P(dev_priv) && intel_phy_is_tc(dev_priv, phy)) {
+		drm_WARN_ON(&dev_priv->drm, !intel_tc_port_in_legacy_mode(dig_port));
+		buf_ctl |= DDI_BUF_CTL_TC_PHY_OWNERSHIP;
+	}
+	intel_de_write(dev_priv, DDI_BUF_CTL(port), buf_ctl);
 
 	intel_audio_codec_enable(encoder, crtc_state, conn_state);
 }