drm/i915: switch to drm_fb_helper_remove_conflicting_pci_framebuffers

No need for a home-grown version, the generic helper should work just
fine.  It also handles vgacon removal these days, see commit
1c74ca7a ("drm/fb-helper: call vga_remove_vgacon automatically."),
so that can be removed too.
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Link: http://patchwork.freedesktop.org/patch/msgid/20190822090645.25410-4-kraxel@redhat.com

drivers/gpu/drm/i915/i915_drv.c

@@ -766,31 +766,6 @@ static int i915_load_modeset_init(struct drm_device *dev)
 	return ret;
 }
 
-static int i915_kick_out_firmware_fb(struct drm_i915_private *dev_priv)
-{
-	struct apertures_struct *ap;
-	struct pci_dev *pdev = dev_priv->drm.pdev;
-	struct i915_ggtt *ggtt = &dev_priv->ggtt;
-	bool primary;
-	int ret;
-
-	ap = alloc_apertures(1);
-	if (!ap)
-		return -ENOMEM;
-
-	ap->ranges[0].base = ggtt->gmadr.start;
-	ap->ranges[0].size = ggtt->mappable_end;
-
-	primary =
-		pdev->resource[PCI_ROM_RESOURCE].flags & IORESOURCE_ROM_SHADOW;
-
-	ret = drm_fb_helper_remove_conflicting_framebuffers(ap, "inteldrmfb", primary);
-
-	kfree(ap);
-
-	return ret;
-}
-
 static void intel_init_dpio(struct drm_i915_private *dev_priv)
 {
 	/*
@@ -1570,21 +1545,9 @@ static int i915_driver_init_hw(struct drm_i915_private *dev_priv)
 	if (ret)
 		goto err_perf;
 
-	/*
-	 * WARNING: Apparently we must kick fbdev drivers before vgacon,
-	 * otherwise the vga fbdev driver falls over.
-	 */
-	ret = i915_kick_out_firmware_fb(dev_priv);
-	if (ret) {
-		DRM_ERROR("failed to remove conflicting framebuffer drivers\n");
-		goto err_ggtt;
-	}
-
-	ret = vga_remove_vgacon(pdev);
-	if (ret) {
-		DRM_ERROR("failed to remove conflicting VGA console\n");
+	ret = drm_fb_helper_remove_conflicting_pci_framebuffers(pdev, "inteldrmfb");
+	if (ret)
 		goto err_ggtt;
-	}
 
 	ret = i915_ggtt_init_hw(dev_priv);
 	if (ret)