From: Tvrtko Ursulin <tvrtko.ursulin@xxxxxxxxx>
By providing a start offset into the source array of pages, and returning the
end position in the scatter-gather table, we will be able to append the UV
plane to the rotated mapping in later patches.
Signed-off-by: Tvrtko Ursulin <tvrtko.ursulin@xxxxxxxxx>
---
drivers/gpu/drm/i915/i915_gem_gtt.c | 19 ++++++++++++-------
1 file changed, 12 insertions(+), 7 deletions(-)
diff --git a/drivers/gpu/drm/i915/i915_gem_gtt.c b/drivers/gpu/drm/i915/i915_gem_gtt.c
index 65c9d36..d7f2e5d 100644
--- a/drivers/gpu/drm/i915/i915_gem_gtt.c
+++ b/drivers/gpu/drm/i915/i915_gem_gtt.c
@@ -2653,15 +2653,18 @@ i915_gem_obj_lookup_or_create_ggtt_vma(struct drm_i915_gem_object *obj,
}
-static void
-rotate_pages(dma_addr_t *in, unsigned int width, unsigned int height,
- struct sg_table *st)
+static struct scatterlist *
+rotate_pages(dma_addr_t *in, unsigned int offset,
+ unsigned int width, unsigned int height,
+ struct sg_table *st, struct scatterlist *sg)
{
unsigned int column, row;
unsigned int src_idx;
- struct scatterlist *sg = st->sgl;
- st->nents = 0;
+ if (!sg) {
+ st->nents = 0;
+ sg = st->sgl;
+ }
for (column = 0; column < width; column++) {
src_idx = width * (height - 1) + column;
@@ -2672,12 +2675,14 @@ rotate_pages(dma_addr_t *in, unsigned int width, unsigned int height,
* The only thing we need are DMA addresses.
*/
sg_set_page(sg, NULL, PAGE_SIZE, 0);
- sg_dma_address(sg) = in[src_idx];
+ sg_dma_address(sg) = in[offset + src_idx];
sg_dma_len(sg) = PAGE_SIZE;
sg = sg_next(sg);
src_idx -= width;
}
}
+
+ return sg;
}
static unsigned long
@@ -2740,7 +2745,7 @@ intel_rotate_fb_obj_pages(struct i915_ggtt_view *ggtt_view,
}
/* Rotate the pages. */
- rotate_pages(page_addr_list, width_pages, height_pages, st);
+ rotate_pages(page_addr_list, 0, width_pages, height_pages, st, NULL);
DRM_DEBUG_KMS(
"Created rotated page mapping for object size %lu (pitch=%u, height=%u, pixel_format=0x%x, %ux%u tiles, %lu pages).\n",
--
2.4.0
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