drm/i915/lvds: nuke intel_lvds_supported()

Now that intel_lvds_init() is only called for platforms that might have
LVDS, move the remaining checks to intel_setup_outputs(), again similar
to other outputs, and remove the overlapping checks.
Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20190122082307.4003-3-jani.nikula@intel.com

drivers/gpu/drm/i915/intel_display.c

@@ -14467,6 +14467,7 @@ static void intel_setup_outputs(struct drm_i915_private *dev_priv)
 	} else if (IS_GEN_RANGE(dev_priv, 3, 4)) {
 		bool found = false;
 
+		if (IS_MOBILE(dev_priv))
 			intel_lvds_init(dev_priv);
 
 		if (dev_priv->vbt.int_crt_support)
@@ -14504,6 +14505,7 @@ static void intel_setup_outputs(struct drm_i915_private *dev_priv)
 		if (IS_G4X(dev_priv) && (I915_READ(DP_D) & DP_DETECTED))
 			intel_dp_init(dev_priv, DP_D, PORT_D);
 	} else if (IS_GEN(dev_priv, 2)) {
+		if (IS_MOBILE(dev_priv) && !IS_I830(dev_priv))
 			intel_lvds_init(dev_priv);
 
 		if (dev_priv->vbt.int_crt_support)

drivers/gpu/drm/i915/intel_lvds.c

@@ -798,26 +798,6 @@ static bool compute_is_dual_link_lvds(struct intel_lvds_encoder *lvds_encoder)
 	return (val & LVDS_CLKB_POWER_MASK) == LVDS_CLKB_POWER_UP;
 }
 
-static bool intel_lvds_supported(struct drm_i915_private *dev_priv)
-{
-	/*
-	 * With the introduction of the PCH we gained a dedicated
-	 * LVDS presence pin, use it.
-	 */
-	if (HAS_PCH_IBX(dev_priv) || HAS_PCH_CPT(dev_priv))
-		return true;
-
-	/*
-	 * Otherwise LVDS was only attached to mobile products,
-	 * except for the inglorious 830gm
-	 */
-	if (INTEL_GEN(dev_priv) <= 4 &&
-	    IS_MOBILE(dev_priv) && !IS_I830(dev_priv))
-		return true;
-
-	return false;
-}
-
 /**
  * intel_lvds_init - setup LVDS connectors on this device
  * @dev_priv: i915 device
@@ -842,9 +822,6 @@ void intel_lvds_init(struct drm_i915_private *dev_priv)
 	u8 pin;
 	u32 allowed_scalers;
 
-	if (!intel_lvds_supported(dev_priv))
-		return;
-
 	/* Skip init on machines we know falsely report LVDS */
 	if (dmi_check_system(intel_no_lvds)) {
 		WARN(!dev_priv->vbt.int_lvds_support,