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)
>
