compositor-drm: Allow disabling universal planes

Add a test environment variable to allow disabling universal planes.

Signed-off-by: Daniel Stone <daniels@collabora.com>
Reviewed-by: Pekka Paalanen <pekka.paalanen@collabora.co.uk>

diff --git a/libweston/compositor-drm.c b/libweston/compositor-drm.c
index dc90781..b641d61 100644 (file)
--- a/libweston/compositor-drm.c
+++ b/libweston/compositor-drm.c
@@ -2105,8 +2105,10 @@ init_kms_caps(struct drm_backend *b)
        else
                b->cursor_height = 64;
 
-       ret = drmSetClientCap(b->drm.fd, DRM_CLIENT_CAP_UNIVERSAL_PLANES, 1);
-       b->universal_planes = (ret == 0);
+       if (!getenv("WESTON_DISABLE_UNIVERSAL_PLANES")) {
+               ret = drmSetClientCap(b->drm.fd, DRM_CLIENT_CAP_UNIVERSAL_PLANES, 1);
+               b->universal_planes = (ret == 0);
+       }
        weston_log("DRM: %s universal planes\n",
                   b->universal_planes ? "supports" : "does not support");