drm/i915: Add HAS_DISPLAY() and use it

Right now it is decided if GEN has display by checking the num_pipes,
so lets make it explicit and use a macro.

Cc: Jani Nikula <jani.nikula@intel.com>
Reviewed-by: Lucas De Marchi <lucas.demarchi@intel.com>
Signed-off-by: José Roberto de Souza <jose.souza@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20181130232048.14216-1-jose.souza@intel.com

drivers/gpu/drm/i915/i915_drv.c

@@ -287,7 +287,7 @@ static void intel_detect_pch(struct drm_i915_private *dev_priv)
 	 * Use PCH_NOP (PCH but no South Display) for PCH platforms without
 	 * display.
 	 */
-	if (pch && INTEL_INFO(dev_priv)->num_pipes == 0) {
+	if (pch && !HAS_DISPLAY(dev_priv)) {
 		DRM_DEBUG_KMS("Display disabled, reverting to NOP PCH\n");
 		dev_priv->pch_type = PCH_NOP;
 		dev_priv->pch_id = 0;
@@ -645,7 +645,7 @@ static int i915_load_modeset_init(struct drm_device *dev)
 	if (i915_inject_load_failure())
 		return -ENODEV;
 
-	if (INTEL_INFO(dev_priv)->num_pipes) {
+	if (HAS_DISPLAY(dev_priv)) {
 		ret = drm_vblank_init(&dev_priv->drm,
 				      INTEL_INFO(dev_priv)->num_pipes);
 		if (ret)
@@ -696,7 +696,7 @@ static int i915_load_modeset_init(struct drm_device *dev)
 
 	intel_overlay_setup(dev_priv);
 
-	if (INTEL_INFO(dev_priv)->num_pipes == 0)
+	if (!HAS_DISPLAY(dev_priv))
 		return 0;
 
 	ret = intel_fbdev_init(dev);
@@ -1566,7 +1566,7 @@ static void i915_driver_register(struct drm_i915_private *dev_priv)
 	} else
 		DRM_ERROR("Failed to register driver for userspace access!\n");
 
-	if (INTEL_INFO(dev_priv)->num_pipes) {
+	if (HAS_DISPLAY(dev_priv)) {
 		/* Must be done after probing outputs */
 		intel_opregion_register(dev_priv);
 		acpi_video_register();
@@ -1590,7 +1590,7 @@ static void i915_driver_register(struct drm_i915_private *dev_priv)
 	 * We need to coordinate the hotplugs with the asynchronous fbdev
 	 * configuration, for which we use the fbdev->async_cookie.
 	 */
-	if (INTEL_INFO(dev_priv)->num_pipes)
+	if (HAS_DISPLAY(dev_priv))
 		drm_kms_helper_poll_init(dev);
 
 	intel_power_domains_enable(dev_priv);

drivers/gpu/drm/i915/i915_drv.h

@@ -2569,6 +2569,8 @@ intel_info(const struct drm_i915_private *dev_priv)
 #define GT_FREQUENCY_MULTIPLIER 50
 #define GEN9_FREQ_SCALER 3
 
+#define HAS_DISPLAY(dev_priv) (INTEL_INFO(dev_priv)->num_pipes > 0)
+
 #include "i915_trace.h"
 
 static inline bool intel_vtd_active(void)

drivers/gpu/drm/i915/intel_bios.c

@@ -1752,7 +1752,7 @@ void intel_bios_init(struct drm_i915_private *dev_priv)
 	const struct bdb_header *bdb;
 	u8 __iomem *bios = NULL;
 
-	if (INTEL_INFO(dev_priv)->num_pipes == 0) {
+	if (!HAS_DISPLAY(dev_priv)) {
 		DRM_DEBUG_KMS("Skipping VBT init due to disabled display.\n");
 		return;
 	}

drivers/gpu/drm/i915/intel_device_info.c

@@ -782,7 +782,7 @@ void intel_device_info_runtime_init(struct intel_device_info *info)
 	if (i915_modparams.disable_display) {
 		DRM_INFO("Display disabled (module parameter)\n");
 		info->num_pipes = 0;
-	} else if (info->num_pipes > 0 &&
+	} else if (HAS_DISPLAY(dev_priv) &&
 		   (IS_GEN7(dev_priv) || IS_GEN8(dev_priv)) &&
 		   HAS_PCH_SPLIT(dev_priv)) {
 		u32 fuse_strap = I915_READ(FUSE_STRAP);
@@ -807,7 +807,7 @@ void intel_device_info_runtime_init(struct intel_device_info *info)
 			DRM_INFO("PipeC fused off\n");
 			info->num_pipes -= 1;
 		}
-	} else if (info->num_pipes > 0 && IS_GEN9(dev_priv)) {
+	} else if (HAS_DISPLAY(dev_priv) && IS_GEN9(dev_priv)) {
 		u32 dfsm = I915_READ(SKL_DFSM);
 		u8 disabled_mask = 0;
 		bool invalid;

drivers/gpu/drm/i915/intel_display.c

@@ -14249,7 +14249,7 @@ static void intel_setup_outputs(struct drm_i915_private *dev_priv)
 
 	intel_pps_init(dev_priv);
 
-	if (INTEL_INFO(dev_priv)->num_pipes == 0)
+	if (!HAS_DISPLAY(dev_priv))
 		return;
 
 	/*
@@ -16040,7 +16040,7 @@ intel_display_capture_error_state(struct drm_i915_private *dev_priv)
 	};
 	int i;
 
-	if (INTEL_INFO(dev_priv)->num_pipes == 0)
+	if (!HAS_DISPLAY(dev_priv))
 		return NULL;
 
 	error = kzalloc(sizeof(*error), GFP_ATOMIC);

drivers/gpu/drm/i915/intel_fbdev.c

@@ -672,7 +672,7 @@ int intel_fbdev_init(struct drm_device *dev)
 	struct intel_fbdev *ifbdev;
 	int ret;
 
-	if (WARN_ON(INTEL_INFO(dev_priv)->num_pipes == 0))
+	if (WARN_ON(!HAS_DISPLAY(dev_priv)))
 		return -ENODEV;
 
 	ifbdev = kzalloc(sizeof(struct intel_fbdev), GFP_KERNEL);

drivers/gpu/drm/i915/intel_i2c.c

@@ -817,7 +817,7 @@ int intel_setup_gmbus(struct drm_i915_private *dev_priv)
 	unsigned int pin;
 	int ret;
 
-	if (INTEL_INFO(dev_priv)->num_pipes == 0)
+	if (!HAS_DISPLAY(dev_priv))
 		return 0;
 
 	if (IS_VALLEYVIEW(dev_priv) || IS_CHERRYVIEW(dev_priv))