drm/i915/icl: Set TC type to unknown in the disconnection flow

Otherwise it would be in a inconsistent state as port is disconnected
but with a valid tc type.

Also setting it to unknown will earlier return
icl_tc_phy_disconnect() for any future calls to
intel_digital_port_connected(), this way we don't need to check if
port is marked as safe everytime.

Cc: Paulo Zanoni <paulo.r.zanoni@intel.com>
Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Signed-off-by: José Roberto de Souza <jose.souza@intel.com>
Signed-off-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20181030215750.28213-2-jose.souza@intel.com

diff --git a/drivers/gpu/drm/i915/intel_dp.c b/drivers/gpu/drm/i915/intel_dp.c
index 03b8e51..5973f77 100644 (file)
--- a/drivers/gpu/drm/i915/intel_dp.c
+++ b/drivers/gpu/drm/i915/intel_dp.c
@@ -5102,21 +5102,24 @@ static void icl_tc_phy_disconnect(struct drm_i915_private *dev_priv,
                                  struct intel_digital_port *dig_port)
 {
        enum tc_port tc_port = intel_port_to_tc(dev_priv, dig_port->base.port);
-       u32 val;
 
-       if (dig_port->tc_type != TC_PORT_LEGACY &&
-           dig_port->tc_type != TC_PORT_TYPEC)
+       if (dig_port->tc_type == TC_PORT_UNKNOWN)
                return;
 
        /*
-        * This function may be called many times in a row without an HPD event
-        * in between, so try to avoid the write when we can.
+        * TBT disconnection flow is read the live status, what was done in
+        * caller.
         */
-       val = I915_READ(PORT_TX_DFLEXDPCSSS);
-       if (val & DP_PHY_MODE_STATUS_NOT_SAFE(tc_port)) {
+       if (dig_port->tc_type == TC_PORT_TYPEC ||
+           dig_port->tc_type == TC_PORT_LEGACY) {
+               u32 val;
+
+               val = I915_READ(PORT_TX_DFLEXDPCSSS);
                val &= ~DP_PHY_MODE_STATUS_NOT_SAFE(tc_port);
                I915_WRITE(PORT_TX_DFLEXDPCSSS, val);
        }
+
+       dig_port->tc_type = TC_PORT_UNKNOWN;
 }
 
 /*