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

BugLink: https://bugs.launchpad.net/bugs/1838116
[ Upstream commit 890880ddfdbe256083170866e49c87618b706ac7 ]

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
Signed-off-by: Sasha Levin <sashal@kernel.org>
Signed-off-by: Kamal Mostafa <kamal@canonical.com>
Signed-off-by: Khalid Elmously <khalid.elmously@canonical.com>

diff --git a/drivers/gpu/drm/drm_plane.c b/drivers/gpu/drm/drm_plane.c
index 2c90519576a3e8b63a4c8361f18672db853ebcec..86d00cb73b13d137ed9c2eddd633e75375dddd9d 100644 (file)
--- a/drivers/gpu/drm/drm_plane.c
+++ b/drivers/gpu/drm/drm_plane.c
@@ -203,6 +203,9 @@ 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]),