Re: [PATCH] drm/i915: Update atomic state when removing mst connector.

[Daniel Vetter <daniel@ffwll.ch>]

On Tue, Jul 21, 2015 at 09:56:15AM +0200, Maarten Lankhorst wrote:
> Signed-off-by: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
> ---
>  drivers/gpu/drm/i915/intel_dp_mst.c | 44 ++++++++++++++++++++++++++++++++++++-
>  1 file changed, 43 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/gpu/drm/i915/intel_dp_mst.c b/drivers/gpu/drm/i915/intel_dp_mst.c
> index edd8fa41e85e..fb4f2715c96f 100644
> --- a/drivers/gpu/drm/i915/intel_dp_mst.c
> +++ b/drivers/gpu/drm/i915/intel_dp_mst.c
> @@ -449,6 +449,48 @@ static struct drm_connector *intel_dp_add_mst_connector(struct drm_dp_mst_topolo
>  	return connector;
>  }
>  
> +static void intel_dp_unbind_mst_connector(struct drm_device *dev,
> +				  struct drm_connector *connector)
> +{
> +	struct drm_atomic_state *state;
> +	struct drm_connector_state *conn_state;
> +	struct drm_crtc *crtc = connector->state->crtc;
> +	int ret;
> +
> +	if (!crtc)
> +		return;
> +
> +	state = drm_atomic_state_alloc(dev);
> +	if (!state)
> +		return;
> +
> +	state->acquire_ctx = dev->mode_config.acquire_ctx;
> +
> +	conn_state = drm_atomic_get_connector_state(state, connector);
> +	ret = PTR_ERR_OR_ZERO(conn_state);
> +	if (!ret)
> +		ret = drm_atomic_set_crtc_for_connector(conn_state, NULL);
> +
> +	if (!ret)
> +		ret = drm_atomic_add_affected_connectors(state, crtc);
> +
> +	if (!ret && !drm_atomic_connectors_for_crtc(state, crtc)) {
> +		struct drm_crtc_state *crtc_state =
> +			drm_atomic_get_existing_crtc_state(state, crtc);
> +
> +		crtc_state->active = false;

The connector will completely disappear, and we don't support cloning.
Which means there's still going to be state check failures. I think we
need a
		crtc_state->enable = false;

here, plus cleaning out the connector_state->crtc link.
-Daniel

> +		ret = drm_atomic_set_mode_for_crtc(crtc_state, NULL);
> +	}
> +
> +	if (!ret)
> +		ret = drm_atomic_commit(state);
> +
> +	if (ret)
> +		drm_atomic_state_free(state);
> +
> +	I915_STATE_WARN_ON(ret);
> +}
> +
>  static void intel_dp_destroy_mst_connector(struct drm_dp_mst_topology_mgr *mgr,
>  					   struct drm_connector *connector)
>  {
> @@ -456,7 +498,7 @@ static void intel_dp_destroy_mst_connector(struct drm_dp_mst_topology_mgr *mgr,
>  	struct drm_device *dev = connector->dev;
>  
>  	drm_modeset_lock_all(dev);
> -	drm_atomic_helper_connector_dpms(connector, DRM_MODE_DPMS_OFF);
> +	intel_dp_unbind_mst_connector(dev, connector);
>  	drm_modeset_unlock_all(dev);
>  
>  	intel_connector->unregister(intel_connector);
> -- 
> 2.1.0
> 
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-- 
Daniel Vetter
Software Engineer, Intel Corporation
http://blog.ffwll.ch
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