[igt-dev] [PATCH i-g-t 2/3] lib/igt_fb: Use render copy/blit for tiled formats on platforms w/o HW detiling

[Imre Deak <imre.deak@intel.com>]

On platforms without HW detiling use render copy or blitting to convert
between a tiled and a linear framebuffer.

Signed-off-by: Imre Deak <imre.deak@intel.com>
---
 lib/igt_fb.c | 16 +++++++++++++---
 1 file changed, 13 insertions(+), 3 deletions(-)

diff --git a/lib/igt_fb.c b/lib/igt_fb.c
index c81b9de8..b5b1750e 100644
--- a/lib/igt_fb.c
+++ b/lib/igt_fb.c
@@ -1975,17 +1975,27 @@ static bool blitter_ok(const struct igt_fb *fb)
 	return true;
 }
 
+static bool hw_can_detile(const struct igt_fb *fb)
+{
+	if (fb->modifier == DRM_FORMAT_MOD_NONE)
+		return true;
+
+	if (!gem_has_legacy_hw_tiling(fb->fd))
+		return false;
+
+	return fb->modifier != I915_FORMAT_MOD_Yf_TILED;
+}
+
 static bool use_enginecopy(const struct igt_fb *fb)
 {
 	return is_ccs_modifier(fb->modifier) ||
-		(fb->modifier == I915_FORMAT_MOD_Yf_TILED &&
-		 !blitter_ok(fb));
+		(!hw_can_detile(fb) && !blitter_ok(fb));
 }
 
 static bool use_blitter(const struct igt_fb *fb)
 {
 	return (fb->modifier == I915_FORMAT_MOD_Y_TILED ||
-		fb->modifier == I915_FORMAT_MOD_Yf_TILED) &&
+		!hw_can_detile(fb)) &&
 		blitter_ok(fb);
 }
 
-- 
2.23.1

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