[PATCH 17/19] dmc/i915/tc: Report pin assignment NONE in TBT-alt mode

[Imre Deak <imre.deak@intel.com>]

The pin assignment is only relevant in case the PHY is owned by the
display, that is in legacy and DP-alt mode. In TBT-alt mode the PHY is
owned by the TBT FW/driver and so the pin assignment/configuration is
managed by those components. A follow-up change will cache the pin
assignment value in all the TypeC modes - querying this by calling
get_pin_assignment() - prepare for that here, by reporting pin
assignment NONE in the TBT-alt mode.

Signed-off-by: Imre Deak <imre.deak@intel.com>
---
 drivers/gpu/drm/i915/display/intel_tc.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/gpu/drm/i915/display/intel_tc.c b/drivers/gpu/drm/i915/display/intel_tc.c
index cd4f0179b8cc4..d874217529951 100644
--- a/drivers/gpu/drm/i915/display/intel_tc.c
+++ b/drivers/gpu/drm/i915/display/intel_tc.c
@@ -287,6 +287,9 @@ get_pin_assignment(struct intel_tc_port *tc)
 	u32 mask;
 	u32 val;
 
+	if (tc->mode == TC_PORT_TBT_ALT)
+		return INTEL_TC_PIN_ASSIGNMENT_NONE;
+
 	if (DISPLAY_VER(display) >= 20) {
 		reg = TCSS_DDI_STATUS(tc_port);
 		mask = TCSS_DDI_STATUS_PIN_ASSIGNMENT_MASK;
-- 
2.49.1