drm/i915: Do PCH and uncore init earlier

For future platforms we'll need to initialize our MMIO function pointers
even earlier. Specifically, we'll need to be able to have register
reads/writes at GTT initialization (in i915_gem_gtt_init). Similarly,
these platforms also have MMIO differences based on the PCH id, so
while moving stuff around, also move the PCH initialization.

CC: Chris Wilson <chris@chris-wilson.co.uk>
Signed-off-by: Ben Widawsky <ben@bwidawsk.net>
[danvet: Mention the function where we need register access.]
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>

drivers/gpu/drm/i915/i915_dma.c

@@ -1542,6 +1542,11 @@ int i915_driver_load(struct drm_device *dev, unsigned long flags)
 
 	intel_uncore_early_sanitize(dev);
 
+	/* This must be called before any calls to HAS_PCH_* */
+	intel_detect_pch(dev);
+
+	intel_uncore_init(dev);
+
 	ret = i915_gem_gtt_init(dev);
 	if (ret)
 		goto out_regs;
@@ -1599,12 +1604,8 @@ int i915_driver_load(struct drm_device *dev, unsigned long flags)
 		goto out_mtrrfree;
 	}
 
-	/* This must be called before any calls to HAS_PCH_* */
-	intel_detect_pch(dev);
-
 	intel_irq_init(dev);
 	intel_pm_init(dev);
-	intel_uncore_init(dev);
 	intel_uncore_sanitize(dev);
 
 	/* Try to make sure MCHBAR is enabled before poking at it */
@@ -1689,6 +1690,7 @@ out_gtt:
 	drm_mm_takedown(&dev_priv->gtt.base.mm);
 	dev_priv->gtt.base.cleanup(&dev_priv->gtt.base);
 out_regs:
+	intel_uncore_fini(dev);
 	pci_iounmap(dev->pdev, dev_priv->regs);
 put_bridge:
 	pci_dev_put(dev_priv->bridge_dev);