crtc_set_mode() only checks if the CRTC mode has changed when deciding
whether encoders require a mode_set. This is insufficient when the CRTC
mode isn't changed but a new encoder is added to it, leading to encoders
never getting mode_set.
Fix this by also checking that a connector's CRTC and encoder have not
changed before skipping its encoder's mode_set.
Signed-off-by: Brian Starkey <brian.starkey at arm.com>
---
drivers/gpu/drm/drm_atomic_helper.c | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)
diff --git a/drivers/gpu/drm/drm_atomic_helper.c
b/drivers/gpu/drm/drm_atomic_helper.c
index 20be86d..206fba1 100644
--- a/drivers/gpu/drm/drm_atomic_helper.c
+++ b/drivers/gpu/drm/drm_atomic_helper.c
@@ -876,7 +876,9 @@ crtc_set_mode(struct drm_device *dev, struct
drm_atomic_state *old_state)
mode = &new_crtc_state->mode;
adjusted_mode = &new_crtc_state->adjusted_mode;
- if (!new_crtc_state->mode_changed)
+ if (!new_crtc_state->mode_changed &&
+ connector->state->crtc == old_conn_state->crtc &&
+ connector->state->best_encoder ==
old_conn_state->best_encoder)
continue;
DRM_DEBUG_ATOMIC("modeset on [ENCODER:%d:%s]\n",
--
1.7.9.5
