[PATCH 2/4] drm/dp_mst: Don't cache EDIDs for physical ports

[Imre Deak]

On Mon, Feb 01, 2021 at 02:01:43PM +0200, Imre Deak wrote:
> Caching EDIDs for physical ports prevents updating the EDID if a port
> gets reconnected via a Connection Status Notification message, fix this.
> 
> Fixes: db1a07956968 ("drm/dp_mst: Handle SST-only branch device case")
> Cc: Wayne Lin <Wayne.Lin at amd.com>
> Cc: Lyude Paul <lyude at redhat.com>
> Signed-off-by: Imre Deak <imre.deak at intel.com>

Pushed patches 2-4 to drm-misc-next, thanks for the review.

> ---
>  drivers/gpu/drm/drm_dp_mst_topology.c | 3 ++-
>  1 file changed, 2 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/gpu/drm/drm_dp_mst_topology.c b/drivers/gpu/drm/drm_dp_mst_topology.c
> index deb7995f42fa..309afe61afdd 100644
> --- a/drivers/gpu/drm/drm_dp_mst_topology.c
> +++ b/drivers/gpu/drm/drm_dp_mst_topology.c
> @@ -2302,7 +2302,8 @@ drm_dp_mst_port_add_connector(struct drm_dp_mst_branch *mstb,
>  	}
>  
>  	if (port->pdt != DP_PEER_DEVICE_NONE &&
> -	    drm_dp_mst_is_end_device(port->pdt, port->mcs)) {
> +	    drm_dp_mst_is_end_device(port->pdt, port->mcs) &&
> +	    port->port_num >= DP_MST_LOGICAL_PORT_0) {
>  		port->cached_edid = drm_get_edid(port->connector,
>  						 &port->aux.ddc);
>  		drm_connector_set_tile_property(port->connector);
> -- 
> 2.25.1
> 
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