drm/i915/tc: Debug print the pin assignment and max lane count

Debug print the TypeC pin assignment and max lane count value during HW
readout and after resetting the TypeC mode.

Reviewed-by: Mika Kahola <mika.kahola@intel.com>
Link: https://lore.kernel.org/r/20250805073700.642107-20-imre.deak@intel.com
Signed-off-by: Imre Deak <imre.deak@intel.com>

diff --git a/drivers/gpu/drm/i915/display/intel_tc.c b/drivers/gpu/drm/i915/display/intel_tc.c
index 706f60a7d291de157beb874c32ea7d29d442d0fc..583fed5a386db8fa9b6681c78c73614d15bcf562 100644 (file)
--- a/drivers/gpu/drm/i915/display/intel_tc.c
+++ b/drivers/gpu/drm/i915/display/intel_tc.c
@@ -277,6 +277,14 @@ static u32 get_lane_mask(struct intel_tc_port *tc)
        return lane_mask >> DP_LANE_ASSIGNMENT_SHIFT(tc->phy_fia_idx);
 }
 
+static char pin_assignment_name(enum intel_tc_pin_assignment pin_assignment)
+{
+       if (pin_assignment == INTEL_TC_PIN_ASSIGNMENT_NONE)
+               return '-';
+
+       return 'A' + pin_assignment - INTEL_TC_PIN_ASSIGNMENT_A;
+}
+
 static enum intel_tc_pin_assignment
 get_pin_assignment(struct intel_tc_port *tc)
 {
@@ -1510,10 +1518,13 @@ static void intel_tc_port_reset_mode(struct intel_tc_port *tc,
        if (!force_disconnect)
                tc_phy_connect(tc, required_lanes);
 
-       drm_dbg_kms(display->drm, "Port %s: TC port mode reset (%s -> %s)\n",
+       drm_dbg_kms(display->drm,
+                   "Port %s: TC port mode reset (%s -> %s) pin assignment: %c max lanes: %d\n",
                    tc->port_name,
                    tc_port_mode_name(old_tc_mode),
-                   tc_port_mode_name(tc->mode));
+                   tc_port_mode_name(tc->mode),
+                   pin_assignment_name(tc->pin_assignment),
+                   tc->max_lane_count);
 }
 
 static bool intel_tc_port_needs_reset(struct intel_tc_port *tc)
@@ -1668,9 +1679,11 @@ void intel_tc_port_sanitize_mode(struct intel_digital_port *dig_port,
                __intel_tc_port_put_link(tc);
        }
 
-       drm_dbg_kms(display->drm, "Port %s: sanitize mode (%s)\n",
+       drm_dbg_kms(display->drm, "Port %s: sanitize mode (%s) pin assignment: %c max lanes: %d\n",
                    tc->port_name,
-                   tc_port_mode_name(tc->mode));
+                   tc_port_mode_name(tc->mode),
+                   pin_assignment_name(tc->pin_assignment),
+                   tc->max_lane_count);
 
        mutex_unlock(&tc->lock);
 }