drm/i915: Apply i830 errata for cursor alignment

i830 requires 32bpp cursors to be aligned to 16KB, so we have to expose
the alignment parameter to i915_gem_attach_phys_object().

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Signed-off-by: Eric Anholt <eric@anholt.net>

drivers/gpu/drm/i915/i915_drv.h

@@ -1000,7 +1000,9 @@ int i915_gem_object_set_to_gtt_domain(struct drm_gem_object *obj,
 				      int write);
 int i915_gem_object_set_to_display_plane(struct drm_gem_object *obj);
 int i915_gem_attach_phys_object(struct drm_device *dev,
-				struct drm_gem_object *obj, int id);
+				struct drm_gem_object *obj,
+				int id,
+				int align);
 void i915_gem_detach_phys_object(struct drm_device *dev,
 				 struct drm_gem_object *obj);
 void i915_gem_free_all_phys_object(struct drm_device *dev);

drivers/gpu/drm/i915/i915_gem.c

@@ -4674,7 +4674,7 @@ i915_gem_load(struct drm_device *dev)
  * e.g. for cursor + overlay regs
  */
 int i915_gem_init_phys_object(struct drm_device *dev,
-			      int id, int size)
+			      int id, int size, int align)
 {
 	drm_i915_private_t *dev_priv = dev->dev_private;
 	struct drm_i915_gem_phys_object *phys_obj;
@@ -4689,7 +4689,7 @@ int i915_gem_init_phys_object(struct drm_device *dev,
 
 	phys_obj->id = id;
 
-	phys_obj->handle = drm_pci_alloc(dev, size, 0);
+	phys_obj->handle = drm_pci_alloc(dev, size, align);
 	if (!phys_obj->handle) {
 		ret = -ENOMEM;
 		goto kfree_obj;
@@ -4771,7 +4771,9 @@ out:
 
 int
 i915_gem_attach_phys_object(struct drm_device *dev,
-			    struct drm_gem_object *obj, int id)
+			    struct drm_gem_object *obj,
+			    int id,
+			    int align)
 {
 	drm_i915_private_t *dev_priv = dev->dev_private;
 	struct drm_i915_gem_object *obj_priv;
@@ -4790,11 +4792,10 @@ i915_gem_attach_phys_object(struct drm_device *dev,
 		i915_gem_detach_phys_object(dev, obj);
 	}
 
-
 	/* create a new object */
 	if (!dev_priv->mm.phys_objs[id - 1]) {
 		ret = i915_gem_init_phys_object(dev, id,
-						obj->size);
+						obj->size, align);
 		if (ret) {
 			DRM_ERROR("failed to init phys object %d size: %zu\n", id, obj->size);
 			goto out;

drivers/gpu/drm/i915/intel_display.c

@@ -4375,8 +4375,10 @@ static int intel_crtc_cursor_set(struct drm_crtc *crtc,
 
 		addr = obj_priv->gtt_offset;
 	} else {
+		int align = IS_I830(dev) ? 16 * 1024 : 256;
 		ret = i915_gem_attach_phys_object(dev, bo,
-						  (intel_crtc->pipe == 0) ? I915_GEM_PHYS_CURSOR_0 : I915_GEM_PHYS_CURSOR_1);
+						  (intel_crtc->pipe == 0) ? I915_GEM_PHYS_CURSOR_0 : I915_GEM_PHYS_CURSOR_1,
+						  align);
 		if (ret) {
 			DRM_ERROR("failed to attach phys object\n");
 			goto fail_locked;

drivers/gpu/drm/i915/intel_overlay.c

@@ -1367,7 +1367,8 @@ void intel_setup_overlay(struct drm_device *dev)
 		overlay->flip_addr = overlay->reg_bo->gtt_offset;
 	} else {
 		ret = i915_gem_attach_phys_object(dev, reg_bo,
-				I915_GEM_PHYS_OVERLAY_REGS);
+						  I915_GEM_PHYS_OVERLAY_REGS,
+						  0);
                 if (ret) {
                         DRM_ERROR("failed to attach phys overlay regs\n");
                         goto out_free_bo;