diff options
| author | Gabriel Krisman Bertazi <krisman@collabora.co.uk> | 2017-02-16 19:44:42 +0300 |
|---|---|---|
| committer | Daniel Vetter <daniel.vetter@ffwll.ch> | 2017-02-26 23:57:24 +0300 |
| commit | cd2523569a733d85788b6fc016e4e23cb3549a25 (patch) | |
| tree | 378a35ff0ea197ed9cee5bbe4d73108df23b87c6 /drivers/gpu/drm/atmel-hlcdc | |
| parent | 3c6d6e0fbf5eb6367dfc8a97f72bd625e78b1aae (diff) | |
| download | linux-cd2523569a733d85788b6fc016e4e23cb3549a25.tar.xz | |
drm: Always prepare null framebuffer in transitional helper
Despite the documentation claim that cleanup_fb will match prior calls
to prepare_fb, in case of NULL framebuffers in the transitional helpers,
the code will skip the call to prepare_fb but not the corresponding
cleanup_fb call. This asymmetry in semantics is unnecessarily surprising
for developers transitioning drivers to atomic model, specially because
the final atomic handlers don't have the issue - the prepare_fb is
always called, despite the new state framebuffer being null.
The only current user of the transitional helper that doesn't take care
of null framebuffers explicitly inside the prepare_fb hook is
atmel_hlcdc, so we take special care to make sure we don't break
anything there.
Signed-off-by: Gabriel Krisman Bertazi <krisman@collabora.co.uk>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Link: http://patchwork.freedesktop.org/patch/msgid/20170216164442.28704-1-krisman@collabora.co.uk
Diffstat (limited to 'drivers/gpu/drm/atmel-hlcdc')
| -rw-r--r-- | drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_plane.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_plane.c b/drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_plane.c index bd2791c4b002..886ed5d8e304 100644 --- a/drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_plane.c +++ b/drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_plane.c @@ -772,6 +772,9 @@ static int atmel_hlcdc_plane_prepare_fb(struct drm_plane *p, drm_plane_state_to_atmel_hlcdc_plane_state(s); int ret; + if (!new_state->fb) + return 0; + ret = atmel_hlcdc_layer_update_start(&plane->layer); if (!ret) state->prepared = true; |