drm/i915: Extract intel_mmio_bar()

We have the same code to determine the MMIO BAR in
two places. Collect it to a single place.
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20221005154159.18750-1-ville.syrjala@linux.intel.comReviewed-by: Matthew Auld <matthew.auld@intel.com>

drivers/gpu/drm/i915/gt/intel_gt.c

@@ -880,7 +880,7 @@ int intel_gt_probe_all(struct drm_i915_private *i915)
 	unsigned int i;
 	int ret;
 
-	mmio_bar = GRAPHICS_VER(i915) == 2 ? GEN2_GTTMMADR_BAR : GTTMMADR_BAR;
+	mmio_bar = intel_mmio_bar(GRAPHICS_VER(i915));
 	phys_addr = pci_resource_start(pdev, mmio_bar);
 
 	/*

drivers/gpu/drm/i915/i915_pci.c

@@ -1295,9 +1295,7 @@ bool i915_pci_resource_valid(struct pci_dev *pdev, int bar)
 
 static bool intel_mmio_bar_valid(struct pci_dev *pdev, struct intel_device_info *intel_info)
 {
-	int gttmmaddr_bar = intel_info->__runtime.graphics.ip.ver == 2 ? GEN2_GTTMMADR_BAR : GTTMMADR_BAR;
-
-	return i915_pci_resource_valid(pdev, gttmmaddr_bar);
+	return i915_pci_resource_valid(pdev, intel_mmio_bar(intel_info->__runtime.graphics.ip.ver));
 }
 
 static int i915_pci_probe(struct pci_dev *pdev, const struct pci_device_id *ent)

drivers/gpu/drm/i915/intel_pci_config.h

@@ -13,6 +13,14 @@
 #define GTT_APERTURE_BAR			GFXMEM_BAR
 #define GEN12_LMEM_BAR				GFXMEM_BAR
 
+static inline int intel_mmio_bar(int graphics_ver)
+{
+	switch (graphics_ver) {
+	case 2: return GEN2_GTTMMADR_BAR;
+	default: return GTTMMADR_BAR;
+	}
+}
+
 /* BSM in include/drm/i915_drm.h */
 
 #define MCHBAR_I915				0x44