commit c1e387f96e79db552180669bfd4e7e40457af715
author Sean Callanan <spyffe@google.com> Fri Jan 17 12:31:58 2020 -0800
committer android-build-merger <android-build-merger@google.com> Fri Jan 17 12:31:58 2020 -0800
tree 50f0a6ec99e280d7054e341509839ca431381b99
parent 116d5b2822d5459d2248928acd586f72b716c4ba
parent 05b972fad5db0a653904f5110eac9aa569c493bc

igt-gpu-tools: respect display's max alpha
am: 05b972fad5

Change-Id: I5ee2ac9ff40cbe949b3dbef6679ddb00a47dd243

lib/igt_kms.c

diff --git a/lib/igt_kms.c b/lib/igt_kms.c
index eb06e2b..4dfcc73 100644
--- a/lib/igt_kms.c
+++ b/lib/igt_kms.c
@@ -1832,7 +1832,24 @@
 		igt_plane_set_prop_enum(plane, IGT_PLANE_PIXEL_BLEND_MODE, "Pre-multiplied");
 
 	if (igt_plane_has_prop(plane, IGT_PLANE_ALPHA))
-		igt_plane_set_prop_value(plane, IGT_PLANE_ALPHA, 0xffff);
+	{
+		uint64_t max_alpha = 0xffff;
+		drmModePropertyPtr alpha_prop = drmModeGetProperty(
+			plane->pipe->display->drm_fd,
+			plane->props[IGT_PLANE_ALPHA]);
+
+		if (alpha_prop)
+		{
+			if (alpha_prop->flags & DRM_MODE_PROP_RANGE)
+			{
+				max_alpha = alpha_prop->values[1];
+			}
+
+			drmModeFreeProperty(alpha_prop);
+		}
+
+		igt_plane_set_prop_value(plane, IGT_PLANE_ALPHA, max_alpha);
+	}
 
 
 	igt_plane_clear_prop_changed(plane, IGT_PLANE_IN_FENCE_FD);