drm/i915/adl_p: Handle TC cold

On ADL-P TC cold is exited and blocked when legacy aux is powered,
that is exacly the same of what ICL need for static TC ports.

TODO: When a TBT hub or monitor is connected it will cause TBT and
legacy aux to be powered at the same time, hopefully this will not
cause any issues but if it do, some rework will be needed.

v2:
 - skip icl_tc_port_assert_ref_held() warn on, adl-p uses aux to
   block TC cold

v3:
 - Drop icl_tc_port_assert_ref_held() earlier return for adl_p, not
   needed anymore
 - Set timeout_expected when enabling aux power well as port could be
   disconnected when tc_cold_block() is called

BSpec: 55480
Cc: Imre Deak <imre.deak@intel.com>
Signed-off-by: José Roberto de Souza <jose.souza@intel.com>
Signed-off-by: Clinton Taylor <Clinton.A.Taylor@intel.com>
Signed-off-by: Matt Roper <matthew.d.roper@intel.com>
Reviewed-by: Clint Taylor <Clinton.A.Taylor@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20210524214805.259692-2-jose.souza@intel.com

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

@@ -619,11 +619,9 @@ icl_tc_phy_aux_power_well_enable(struct drm_i915_private *dev_priv,
 	 * or need to enable AUX on a legacy TypeC port as part of the TC-cold
 	 * exit sequence.
 	 */
-	timeout_expected = is_tbt;
-	if (DISPLAY_VER(dev_priv) == 11 && dig_port->tc_legacy_port) {
+	timeout_expected = is_tbt || intel_tc_cold_requires_aux_pw(dig_port);
+	if (DISPLAY_VER(dev_priv) == 11 && dig_port->tc_legacy_port)
 		icl_tc_cold_exit(dev_priv);
-		timeout_expected = true;
-	}
 
 	hsw_wait_for_power_well_enable(dev_priv, power_well, timeout_expected);
 

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

@@ -26,9 +26,7 @@ static const char *tc_port_mode_name(enum tc_port_mode mode)
 static enum intel_display_power_domain
 tc_cold_get_power_domain(struct intel_digital_port *dig_port)
 {
-	struct drm_i915_private *i915 = to_i915(dig_port->base.base.dev);
-
-	if (DISPLAY_VER(i915) == 11)
+	if (intel_tc_cold_requires_aux_pw(dig_port))
 		return intel_legacy_aux_to_power_domain(dig_port->aux_ch);
 	else
 		return POWER_DOMAIN_TC_COLD_OFF;
@@ -564,7 +562,7 @@ static void intel_tc_port_reset_mode(struct intel_digital_port *dig_port,
 	enum tc_port_mode old_tc_mode = dig_port->tc_mode;
 
 	intel_display_power_flush_work(i915);
-	if (DISPLAY_VER(i915) != 11 || !dig_port->tc_legacy_port) {
+	if (!intel_tc_cold_requires_aux_pw(dig_port)) {
 		enum intel_display_power_domain aux_domain;
 		bool aux_powered;
 
@@ -781,3 +779,11 @@ void intel_tc_port_init(struct intel_digital_port *dig_port, bool is_legacy)
 	dig_port->tc_link_refcount = 0;
 	tc_port_load_fia_params(i915, dig_port);
 }
+
+bool intel_tc_cold_requires_aux_pw(struct intel_digital_port *dig_port)
+{
+	struct drm_i915_private *i915 = to_i915(dig_port->base.base.dev);
+
+	return (DISPLAY_VER(i915) == 11 && dig_port->tc_legacy_port) ||
+		IS_ALDERLAKE_P(i915);
+}

drivers/gpu/drm/i915/display/intel_tc.h

@@ -29,4 +29,6 @@ bool intel_tc_port_ref_held(struct intel_digital_port *dig_port);
 
 void intel_tc_port_init(struct intel_digital_port *dig_port, bool is_legacy);
 
+bool intel_tc_cold_requires_aux_pw(struct intel_digital_port *dig_port);
+
 #endif /* __INTEL_TC_H__ */