[Intel-gfx] [PATCH i-g-t v3 2/5] lib/igt_fb: Add helper function for tile_to_mod

[Praveen Paneri]

From: Praveen Paneri <praveen.paneri at intel.com>

igt_get_fb_tile_size function takes modifer as an argument
This helper function will let users to convert tiling to
modifier and use igt_get_fb_tile_size()

v2: Improved code comment (Paulo)

Signed-off-by: Praveen Paneri <praveen.paneri at intel.com>
---
 lib/igt_fb.c | 26 ++++++++++++++++++++++++++
 lib/igt_fb.h |  1 +
 2 files changed, 27 insertions(+)

diff --git a/lib/igt_fb.c b/lib/igt_fb.c
index c94f95e..042b413 100644
--- a/lib/igt_fb.c
+++ b/lib/igt_fb.c
@@ -217,6 +217,32 @@ uint64_t igt_fb_mod_to_tiling(uint64_t modifier)
 	}
 }
 
+/**
+ * igt_fb_tiling_to_mod:
+ * @tiling: DRM framebuffer tiling
+ *
+ * This function converts a DRM framebuffer tiling to its corresponding
+ * modifier constant.
+ *
+ * Returns:
+ * A modifier constant
+ */
+uint64_t igt_fb_tiling_to_mod(uint64_t tiling)
+{
+	switch (tiling) {
+	case I915_TILING_NONE:
+		return LOCAL_DRM_FORMAT_MOD_NONE;
+	case I915_TILING_X:
+		return LOCAL_I915_FORMAT_MOD_X_TILED;
+	case I915_TILING_Y:
+		return LOCAL_I915_FORMAT_MOD_Y_TILED;
+	case I915_TILING_Yf:
+		return LOCAL_I915_FORMAT_MOD_Yf_TILED;
+	default:
+		igt_assert(0);
+	}
+}
+
 /* helpers to create nice-looking framebuffers */
 static int create_bo_for_fb(int fd, int width, int height, uint32_t format,
 			    uint64_t tiling, unsigned size, unsigned stride,
diff --git a/lib/igt_fb.h b/lib/igt_fb.h
index 010ed3a..9b8ec8a 100644
--- a/lib/igt_fb.h
+++ b/lib/igt_fb.h
@@ -132,6 +132,7 @@ int igt_create_bo_with_dimensions(int fd, int width, int height, uint32_t format
 				  bool *is_dumb);
 
 uint64_t igt_fb_mod_to_tiling(uint64_t modifier);
+uint64_t igt_fb_tiling_to_mod(uint64_t tiling);
 
 /* cairo-based painting */
 cairo_t *igt_get_cairo_ctx(int fd, struct igt_fb *fb);
-- 
1.9.1