[PATCH 01/12][SRU][U/OEM-5.14] drm/i915/adlp/tc: Fix PHY connected check for Thunderbolt mode

[Chris Chiu]

From: Imre Deak <imre.deak at intel.com>

BugLink: https://bugs.launchpad.net/bugs/1952041

On ADL-P the PHY ready (aka status complete on other platforms) flag is
always set, besides when a DP-alt, legacy sink is connected also when a
TBT sink is connected or nothing is connected. So assume the PHY to be
connected when both the TBT live status and PHY ready flags are set.

Cc: José Roberto de Souza <jose.souza at intel.com>
Signed-off-by: Imre Deak <imre.deak at intel.com>
Reviewed-by: José Roberto de Souza <jose.souza at intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20210921002313.1132357-3-imre.deak@intel.com
(cherry picked from commit 4f7dad584fdce914d698233179a1188481789884)
Signed-off-by: Chris Chiu <chris.chiu at canonical.com>
---
 drivers/gpu/drm/i915/display/intel_tc.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/gpu/drm/i915/display/intel_tc.c b/drivers/gpu/drm/i915/display/intel_tc.c
index 3ffece568ed9..7dc3696085c7 100644
--- a/drivers/gpu/drm/i915/display/intel_tc.c
+++ b/drivers/gpu/drm/i915/display/intel_tc.c
@@ -509,6 +509,10 @@ static bool icl_tc_phy_is_connected(struct intel_digital_port *dig_port)
 		return dig_port->tc_mode == TC_PORT_TBT_ALT;
 	}
 
+	/* On ADL-P the PHY complete flag is set in TBT mode as well. */
+	if (IS_ALDERLAKE_P(i915) && dig_port->tc_mode == TC_PORT_TBT_ALT)
+		return true;
+
 	if (!tc_phy_is_owned(dig_port)) {
 		drm_dbg_kms(&i915->drm, "Port %s: PHY not owned\n",
 			    dig_port->tc_port_name);
-- 
2.25.1