drm/atomic: Do not unset crtc when an encoder is stolen

[ Upstream commit 97a8df90875f72ba3b4c3320759fd93cea743261 ]

While we steal the encoder away from the connector the connector may
be updated to use a different encoder.

Without this change if 2 connectors swap encoders one of them will
end up without a crtc.

Signed-off-by: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
Reviewed-by: Gustavo Padovan <gustavo.padovan@collabora.co.uk>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Link: http://patchwork.freedesktop.org/patch/msgid/1452160762-30487-5-git-send-email-maarten.lankhorst@linux.intel.com
Signed-off-by: Sasha Levin <alexander.levin@verizon.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/gpu/drm/drm_atomic_helper.c b/drivers/gpu/drm/drm_atomic_helper.c
index e5aec45bf9855bfb18192e46b5a9dfd05eb0d170..1ac29d703c126422c0fde5622d04ba9d67b963fc 100644 (file)
--- a/drivers/gpu/drm/drm_atomic_helper.c
+++ b/drivers/gpu/drm/drm_atomic_helper.c
@@ -108,7 +108,6 @@ steal_encoder(struct drm_atomic_state *state,
        struct drm_crtc_state *crtc_state;
        struct drm_connector *connector;
        struct drm_connector_state *connector_state;
-       int ret;
 
        /*
         * We can only steal an encoder coming from a connector, which means we
@@ -139,9 +138,6 @@ steal_encoder(struct drm_atomic_state *state,
                if (IS_ERR(connector_state))
                        return PTR_ERR(connector_state);
 
-               ret = drm_atomic_set_crtc_for_connector(connector_state, NULL);
-               if (ret)
-                       return ret;
                connector_state->best_encoder = NULL;
        }