linux-kernel - Re: [PATCH 6/6] drm/amdgpu/dm/mst: Use drm_dp_mst_connector_atomic

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Date:   Thu, 20 Sep 2018 19:36:06 -0400
From:   Harry Wentland <harry.wentland@....com>
To:     Lyude Paul <lyude@...hat.com>, dri-devel@...ts.freedesktop.org,
        nouveau@...ts.freedesktop.org, intel-gfx@...ts.freedesktop.org,
        amd-gfx@...ts.freedesktop.org
Cc:     Leo Li <sunpeng.li@....com>,
        Alex Deucher <alexander.deucher@....com>,
        Christian König <christian.koenig@....com>,
        "David (ChunMing) Zhou" <David1.Zhou@....com>,
        David Airlie <airlied@...ux.ie>,
        "Jerry (Fangzhi) Zuo" <Jerry.Zuo@....com>,
        Roman Li <Roman.Li@....com>, Tony Cheng <Tony.Cheng@....com>,
        Andrey Grodzovsky <Andrey.Grodzovsky@....com>,
        Daniel Vetter <daniel.vetter@...ll.ch>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 6/6] drm/amdgpu/dm/mst: Use
 drm_dp_mst_connector_atomic_check()

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@...hat.com>

Reviewed-by: Harry Wentland <harry.wentland@....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)
>