Nouveau - Sep 2018 - [PATCH 6/6] drm/amdgpu/dm/mst: Use drm_dp_mst_connector_atomic_check()

Hook this into amdgpu's atomic check for their connectors so they never
get modesets on no-longer-present MST connectors. We'll also expand on
this later once we add DP MST fallback retraining support.

As well, turns out that the only atomic DRM driver without the
->best_encoder() bug is amdgpu. Congrats AMD!

Signed-off-by: Lyude Paul <lyude at redhat.com>
---
 .../drm/amd/display/amdgpu_dm/amdgpu_dm_mst_types.c  | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_mst_types.c
b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_mst_types.c
index 9a300732ba37..d011a39f17b2 100644
--- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_mst_types.c
+++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_mst_types.c
@@ -294,10 +294,22 @@ static struct drm_encoder *dm_mst_best_encoder(struct
drm_connector *connector)
 	return &amdgpu_dm_connector->mst_encoder->base;
 }
 
+static int
+amdgpu_dm_mst_connector_atomic_check(struct drm_connector *connector,
+				     struct drm_connector_state *new_cstate)
+{
+	struct amdgpu_dm_connector *aconnector +		to_amdgpu_dm_connector(connector);
+
+	return drm_dp_mst_connector_atomic_check(connector, new_cstate,
+						 &aconnector->mst_mgr);
+}
+
 static const struct drm_connector_helper_funcs dm_dp_mst_connector_helper_funcs
= {
 	.get_modes = dm_dp_mst_get_modes,
 	.mode_valid = amdgpu_dm_connector_mode_valid,
 	.best_encoder = dm_mst_best_encoder,
+	.atomic_check = amdgpu_dm_mst_connector_atomic_check,
 };
 
 static void amdgpu_dm_encoder_destroy(struct drm_encoder *encoder)
-- 
2.17.1

On 2018-09-18 07:06 PM, Lyude Paul wrote:
> Hook this into amdgpu's atomic check for their connectors so they never
> get modesets on no-longer-present MST connectors. We'll also expand on
> this later once we add DP MST fallback retraining support.
> 
> As well, turns out that the only atomic DRM driver without the
> ->best_encoder() bug is amdgpu. Congrats AMD!
> 
> Signed-off-by: Lyude Paul <lyude at redhat.com>
Reviewed-by: Harry Wentland <harry.wentland at amd.com>

Harry
> ---
>  .../drm/amd/display/amdgpu_dm/amdgpu_dm_mst_types.c  | 12 ++++++++++++
>  1 file changed, 12 insertions(+)
> 
> diff --git a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_mst_types.c
b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_mst_types.c
> index 9a300732ba37..d011a39f17b2 100644
> --- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_mst_types.c
> +++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_mst_types.c
> @@ -294,10 +294,22 @@ static struct drm_encoder *dm_mst_best_encoder(struct
drm_connector *connector)
>  	return &amdgpu_dm_connector->mst_encoder->base;
>  }
>  
> +static int
> +amdgpu_dm_mst_connector_atomic_check(struct drm_connector *connector,
> +				     struct drm_connector_state *new_cstate)
> +{
> +	struct amdgpu_dm_connector *aconnector > +	
to_amdgpu_dm_connector(connector);
> +
> +	return drm_dp_mst_connector_atomic_check(connector, new_cstate,
> +						 &aconnector->mst_mgr);
> +}
> +
>  static const struct drm_connector_helper_funcs
dm_dp_mst_connector_helper_funcs = {
>  	.get_modes = dm_dp_mst_get_modes,
>  	.mode_valid = amdgpu_dm_connector_mode_valid,
>  	.best_encoder = dm_mst_best_encoder,
> +	.atomic_check = amdgpu_dm_mst_connector_atomic_check,
>  };
>  
>  static void amdgpu_dm_encoder_destroy(struct drm_encoder *encoder)
>