[PATCH i-g-t 3/7] lib/intel_blt: Add i915 -> blt tile helper converter

["Zbigniew Kempczyński" <zbigniew.kempczynski@intel.com>]

We have two kind of buffers in IGT - intel-buf for render and
blt-object for blitter. intel-buf uses I915_TILING* whereas
blt-object blt_tiling_type (T_*). To construct blt-object from
intel-buf we need to convert I915_TILING* to T_*. Add function
which does this conversion.

Signed-off-by: Zbigniew Kempczyński <zbigniew.kempczynski@intel.com>
---
 lib/intel_blt.c | 21 +++++++++++++++++++++
 lib/intel_blt.h |  1 +
 2 files changed, 22 insertions(+)

diff --git a/lib/intel_blt.c b/lib/intel_blt.c
index 5a281036c4..946adc538b 100644
--- a/lib/intel_blt.c
+++ b/lib/intel_blt.c
@@ -560,6 +560,27 @@ int blt_tile_to_i915_tile(enum blt_tiling_type tiling)
 	return 0;
 }
 
+/**
+ * i915_tile_to_blt_tile:
+ * @tiling: tiling id
+ *
+ * Returns:
+ * id of blt tiling like T_LINEAR, T_XMAJOR, etc
+ */
+enum blt_tiling_type i915_tile_to_blt_tile(uint32_t tiling)
+{
+	switch (tiling) {
+	case I915_TILING_NONE:	return T_LINEAR;
+	case I915_TILING_X:	return T_XMAJOR;
+	case I915_TILING_Y:	return T_YMAJOR;
+	case I915_TILING_4:	return T_TILE4;
+	case I915_TILING_64:	return T_TILE64;
+	case I915_TILING_Yf:	return T_YFMAJOR;
+	default:
+		igt_assert_f(0, "Unknown tiling!\n");
+	}
+}
+
 /**
  * blt_get_min_stride
  * @width: width in pixels
diff --git a/lib/intel_blt.h b/lib/intel_blt.h
index fcfce69bee..6daf46aea4 100644
--- a/lib/intel_blt.h
+++ b/lib/intel_blt.h
@@ -214,6 +214,7 @@ bool blt_uses_extended_block_copy(int fd);
 
 const char *blt_tiling_name(enum blt_tiling_type tiling);
 int blt_tile_to_i915_tile(enum blt_tiling_type tiling);
+enum blt_tiling_type i915_tile_to_blt_tile(uint32_t tiling);
 
 uint32_t blt_get_min_stride(uint32_t width, uint32_t bpp,
 			    enum blt_tiling_type tiling);
-- 
2.34.1