[Intel-gfx] [PATCH 4/8] drm/i915: Extract tiled geometry calculation into a helper function

[Tvrtko Ursulin]

From: Tvrtko Ursulin <tvrtko.ursulin at intel.com>

It will be used twice with support for planar NV12.

Signed-off-by: Tvrtko Ursulin <tvrtko.ursulin at intel.com>
---
 drivers/gpu/drm/i915/i915_gem_gtt.c | 27 ++++++++++++++++++++-------
 1 file changed, 20 insertions(+), 7 deletions(-)

diff --git a/drivers/gpu/drm/i915/i915_gem_gtt.c b/drivers/gpu/drm/i915/i915_gem_gtt.c
index f5709d4..65c9d36 100644
--- a/drivers/gpu/drm/i915/i915_gem_gtt.c
+++ b/drivers/gpu/drm/i915/i915_gem_gtt.c
@@ -2680,6 +2680,24 @@ rotate_pages(dma_addr_t *in, unsigned int width, unsigned int height,
 	}
 }
 
+static unsigned long
+intel_calc_tiled_geometry(struct drm_device *dev,
+			  struct intel_rotation_info *rot_info,
+			  unsigned int *width_pages,
+			  unsigned int *height_pages,
+			  unsigned int plane)
+{
+	unsigned int tile_height, tile_pitch;
+
+	tile_height = intel_tile_height(dev, rot_info->pixel_format,
+					rot_info->fb_modifier, plane);
+	tile_pitch = PAGE_SIZE / tile_height;
+	*width_pages = DIV_ROUND_UP(rot_info->pitch, tile_pitch);
+	*height_pages = DIV_ROUND_UP(rot_info->height, tile_height);
+
+	return (*width_pages) * (*height_pages);
+}
+
 static struct sg_table *
 intel_rotate_fb_obj_pages(struct i915_ggtt_view *ggtt_view,
 			  struct drm_i915_gem_object *obj)
@@ -2691,19 +2709,14 @@ intel_rotate_fb_obj_pages(struct i915_ggtt_view *ggtt_view,
 	unsigned long i;
 	dma_addr_t *page_addr_list;
 	struct sg_table *st;
-	unsigned int tile_pitch, tile_height;
 	unsigned int width_pages, height_pages;
 	int ret = -ENOMEM;
 
 	pages = obj->base.size / PAGE_SIZE;
 
 	/* Calculate tiling geometry. */
-	tile_height = intel_tile_height(dev, rot_info->pixel_format,
-					rot_info->fb_modifier, 0);
-	tile_pitch = PAGE_SIZE / tile_height;
-	width_pages = DIV_ROUND_UP(rot_info->pitch, tile_pitch);
-	height_pages = DIV_ROUND_UP(rot_info->height, tile_height);
-	rot_pages = width_pages * height_pages;
+	rot_pages = intel_calc_tiled_geometry(dev, rot_info,
+					      &width_pages, &height_pages, 0);
 
 	/* Allocate a temporary list of source pages for random access. */
 	page_addr_list = drm_malloc_ab(pages, sizeof(dma_addr_t));
-- 
2.4.0