drm: Auto-set allow_fb_modifiers when given modifiers at plane init

When drivers pass non-empty lists of modifiers for initializing their
planes, we can infer that they allow framebuffer modifiers and set the
driver's allow_fb_modifiers mode config element.

In case the allow_fb_modifiers element was not set (some drivers tend
to set them after registering planes), the modifiers will still be
registered but won't be available to userspace unless the flag is set
later. However in that case, the IN_FORMATS blob won't be created.

In order to avoid this case and generally reduce the trouble associated
with the flag, always set allow_fb_modifiers when a non-empty list of
format modifiers is passed at plane init.

Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Signed-off-by: Paul Kocialkowski <paul.kocialkowski@bootlin.com>
Signed-off-by: Maxime Ripard <maxime.ripard@bootlin.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20190104085610.5829-1-paul.kocialkowski@bootlin.com

diff --git a/drivers/gpu/drm/drm_plane.c b/drivers/gpu/drm/drm_plane.c
index 5f650d8fc66b7a9514db4be47b937871f28d900f..4cfb56893b7f2e50deed2334ec904389a2c33f43 100644 (file)
--- a/drivers/gpu/drm/drm_plane.c
+++ b/drivers/gpu/drm/drm_plane.c
@@ -220,6 +220,9 @@ int drm_universal_plane_init(struct drm_device *dev, struct drm_plane *plane,
                        format_modifier_count++;
        }
 
+       if (format_modifier_count)
+               config->allow_fb_modifiers = true;
+
        plane->modifier_count = format_modifier_count;
        plane->modifiers = kmalloc_array(format_modifier_count,
                                         sizeof(format_modifiers[0]),