27 Nov
2020
27 Nov
'20
8:43 a.m.
On 25/11/2020 11:07, Daniel Vetter wrote:
Laurent, does this ring any bells? The WARN comes in drm_atomic_bridge_chain_enable() when drm_atomic_get_old_bridge_state() returns null for (presumably) sdi bridge.
I'm not sure why the bridge state would not be there.
Lack of state on first modeset usually means your drm_mode_config_reset didn't create one. Or whatever it is you're using. I didn't look whether you're wiring this up correctly or not. We might even want to add a ->reset function to drm_private_state_funcs to make this work for everyone.
The bridge driver set atomic_enable and atomic_disable, but no other atomic funcs. It was supposed to set the legacy enable & disable.
Tomi
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