drm/i915: Warn if trying to register eDP on port != B/C on vlv/chv

Only ports B and C have the power sequencer and backlight controls,
so complain if we ever try to register an eDP connector on some other
port.

Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Reviewed-by: Imre Deak <imre.deak@intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>

diff --git a/drivers/gpu/drm/i915/intel_dp.c b/drivers/gpu/drm/i915/intel_dp.c
index b474a29..3f18580 100644 (file)
--- a/drivers/gpu/drm/i915/intel_dp.c
+++ b/drivers/gpu/drm/i915/intel_dp.c
@@ -5203,6 +5203,11 @@ intel_dp_init_connector(struct intel_digital_port *intel_dig_port,
        if (type == DRM_MODE_CONNECTOR_eDP)
                intel_encoder->type = INTEL_OUTPUT_EDP;
 
+       /* eDP only on port B and/or C on vlv/chv */
+       if (WARN_ON(IS_VALLEYVIEW(dev) && is_edp(intel_dp) &&
+                   port != PORT_B && port != PORT_C))
+               return false;
+
        DRM_DEBUG_KMS("Adding %s connector on port %c\n",
                        type == DRM_MODE_CONNECTOR_eDP ? "eDP" : "DP",
                        port_name(port));