[PATCH v2 8/9] drm/dp: Release DP MST shared link bandwidth

[Daniel Vetter]

On Tue, Jan 24, 2017 at 03:49:36PM -0800, Dhinakaran Pandiyan wrote:
> Implement the ->atomic_release() callback to release the shared link
> bandwidth that was originally acquired during compute_config()
> 
> Signed-off-by: Dhinakaran Pandiyan <dhinakaran.pandiyan at intel.com>
> ---
>  drivers/gpu/drm/i915/intel_dp_mst.c | 28 ++++++++++++++++++++++++++++
>  1 file changed, 28 insertions(+)
> 
> diff --git a/drivers/gpu/drm/i915/intel_dp_mst.c b/drivers/gpu/drm/i915/intel_dp_mst.c
> index f51574f..2f57a56 100644
> --- a/drivers/gpu/drm/i915/intel_dp_mst.c
> +++ b/drivers/gpu/drm/i915/intel_dp_mst.c
> @@ -78,6 +78,33 @@ static bool intel_dp_mst_compute_config(struct intel_encoder *encoder,
>  
>  }
>  
> +static void intel_dp_mst_atomic_release(struct drm_connector *connector,
> +					struct drm_connector_state *conn_state)
> +{
> +	struct intel_dp_mst_encoder *intel_mst;
> +	struct drm_dp_mst_topology_mgr *mgr;
> +	struct drm_dp_mst_topology_state *topology_state;
> +	struct drm_encoder *encoder;
> +	struct intel_connector *intel_connector = to_intel_connector(connector);
> +
> +	encoder = connector->state->best_encoder;
> +	if (!encoder || to_intel_encoder(encoder)->type != INTEL_OUTPUT_DP_MST)
> +		return;

NULL encoder should imo be caught in core. Type != DP_MST is impossible,
if you're unsure make it into a BUG_ON for testing.
> +
> +	intel_mst = enc_to_mst(encoder);
> +	mgr = &intel_mst->primary->dp.mst_mgr;
> +
> +	topology_state = drm_atomic_get_mst_topology_state(conn_state->state,
> +							   mgr);
> +	if (IS_ERR(topology_state)) {
> +		DRM_DEBUG_KMS("failed to create MST topology state %ld\n",
> +				PTR_ERR(topology_state));
> +		return;
> +	}
> +
> +	drm_dp_atomic_release_vcpi_slots(topology_state, intel_connector->port);

I think it'd be great to merge this together into 1 helper that both gets
the state and releases the vcpi, for less code in drivers.
> +}
> +
>  static void intel_mst_disable_dp(struct intel_encoder *encoder,
>  				 struct intel_crtc_state *old_crtc_state,
>  				 struct drm_connector_state *old_conn_state)
> @@ -401,6 +428,7 @@ static const struct drm_connector_helper_funcs intel_dp_mst_connector_helper_fun
>  	.mode_valid = intel_dp_mst_mode_valid,
>  	.atomic_best_encoder = intel_mst_atomic_best_encoder,
>  	.best_encoder = intel_mst_best_encoder,
> +	.atomic_release = intel_dp_mst_atomic_release,
>  };
>  
>  static void intel_dp_mst_encoder_destroy(struct drm_encoder *encoder)
> -- 
> 2.7.4
> 

-- 
Daniel Vetter
Software Engineer, Intel Corporation
http://blog.ffwll.ch