drm/i915: make g4x_digital_port_connected return boolean status

We should not be hitting any of the default cases in
g4x_digital_port_connected, so add MISSING_CASE annotation and return
boolean status. The current behaviour is just cargo culting from the
days of yonder when the display port support was added to i915.

Signed-off-by: Jani Nikula <jani.nikula@intel.com>
Reviewed-by: Durgadoss R <durgadoss.r@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 307a45b2a404bea7211f26f48ac45b6e13429aa2..be53e36499b867153b5537ff7d6168b9a5bbb84b 100644 (file)
--- a/drivers/gpu/drm/i915/intel_dp.c
+++ b/drivers/gpu/drm/i915/intel_dp.c
@@ -4525,14 +4525,14 @@ static bool ibx_digital_port_connected(struct drm_i915_private *dev_priv,
        return I915_READ(SDEISR) & bit;
 }
 
-static int g4x_digital_port_connected(struct drm_device *dev,
-                                      struct intel_digital_port *intel_dig_port)
+static bool g4x_digital_port_connected(struct drm_device *dev,
+                                      struct intel_digital_port *port)
 {
        struct drm_i915_private *dev_priv = dev->dev_private;
        uint32_t bit;
 
        if (IS_VALLEYVIEW(dev)) {
-               switch (intel_dig_port->port) {
+               switch (port->port) {
                case PORT_B:
                        bit = PORTB_HOTPLUG_LIVE_STATUS_VLV;
                        break;
@@ -4543,10 +4543,11 @@ static int g4x_digital_port_connected(struct drm_device *dev,
                        bit = PORTD_HOTPLUG_LIVE_STATUS_VLV;
                        break;
                default:
-                       return -EINVAL;
+                       MISSING_CASE(port->port);
+                       return false;
                }
        } else {
-               switch (intel_dig_port->port) {
+               switch (port->port) {
                case PORT_B:
                        bit = PORTB_HOTPLUG_LIVE_STATUS_G4X;
                        break;
@@ -4557,13 +4558,12 @@ static int g4x_digital_port_connected(struct drm_device *dev,
                        bit = PORTD_HOTPLUG_LIVE_STATUS_G4X;
                        break;
                default:
-                       return -EINVAL;
+                       MISSING_CASE(port->port);
+                       return false;
                }
        }
 
-       if ((I915_READ(PORT_HOTPLUG_STAT) & bit) == 0)
-               return 0;
-       return 1;
+       return I915_READ(PORT_HOTPLUG_STAT) & bit;
 }
 
 static enum drm_connector_status
@@ -4584,7 +4584,6 @@ g4x_dp_detect(struct intel_dp *intel_dp)
 {
        struct drm_device *dev = intel_dp_to_dev(intel_dp);
        struct intel_digital_port *intel_dig_port = dp_to_dig_port(intel_dp);
-       int ret;
 
        /* Can't disconnect eDP, but you can close the lid... */
        if (is_edp(intel_dp)) {
@@ -4596,10 +4595,7 @@ g4x_dp_detect(struct intel_dp *intel_dp)
                return status;
        }
 
-       ret = g4x_digital_port_connected(dev, intel_dig_port);
-       if (ret == -EINVAL)
-               return connector_status_unknown;
-       else if (ret == 0)
+       if (!g4x_digital_port_connected(dev, intel_dig_port))
                return connector_status_disconnected;
 
        return intel_dp_detect_dpcd(intel_dp);
@@ -5066,7 +5062,7 @@ intel_dp_hpd_pulse(struct intel_digital_port *intel_dig_port, bool long_hpd)
                        if (!ibx_digital_port_connected(dev_priv, intel_dig_port))
                                goto mst_fail;
                } else {
-                       if (g4x_digital_port_connected(dev, intel_dig_port) != 1)
+                       if (!g4x_digital_port_connected(dev, intel_dig_port))
                                goto mst_fail;
                }