[PATCH v2 29/35] drm/bridge: Assume that a bridge is atomic if it has atomic_reset

[Maxime Ripard]

A bridge is considered atomic-enabled if it has an atomic_check
implementation. However, atomic_check is optional and thus a driver
might very well not provide an implementation, and yet still be atomic.

Switch to atomic_reset, which allocates the initial bridge state and is
thus a better candidate.

Signed-off-by: Maxime Ripard <mrip...@kernel.org>
---
 drivers/gpu/drm/drm_bridge.c | 12 +++++++-----
 1 file changed, 7 insertions(+), 5 deletions(-)

diff --git a/drivers/gpu/drm/drm_bridge.c b/drivers/gpu/drm/drm_bridge.c
index 
d7c17a26e86fd9a3e5a39f335edff4ffce30dd79..ad91a0ac375a9c8cf82834354ec7f654a59a7292
 100644
--- a/drivers/gpu/drm/drm_bridge.c
+++ b/drivers/gpu/drm/drm_bridge.c
@@ -794,23 +794,25 @@ EXPORT_SYMBOL(drm_atomic_bridge_chain_enable);
 
 static int drm_atomic_bridge_check(struct drm_bridge *bridge,
                                   struct drm_crtc_state *crtc_state,
                                   struct drm_connector_state *conn_state)
 {
-       if (bridge->funcs->atomic_check) {
+       if (bridge->funcs->atomic_reset) {
                struct drm_bridge_state *bridge_state;
                int ret;
 
                bridge_state = 
drm_atomic_get_new_bridge_state(crtc_state->state,
                                                               bridge);
                if (WARN_ON(!bridge_state))
                        return -EINVAL;
 
-               ret = bridge->funcs->atomic_check(bridge, bridge_state,
-                                                 crtc_state, conn_state);
-               if (ret)
-                       return ret;
+               if (bridge->funcs->atomic_check) {
+                       ret = bridge->funcs->atomic_check(bridge, bridge_state,
+                                                         crtc_state, 
conn_state);
+                       if (ret)
+                               return ret;
+               }
        } else if (bridge->funcs->mode_fixup) {
                if (!bridge->funcs->mode_fixup(bridge, &crtc_state->mode,
                                               &crtc_state->adjusted_mode))
                        return -EINVAL;
        }

-- 
2.48.0