[PATCH v2 12/21] drm/i915/dp: Use check link state work in the detect handler

[gareth . yu]

A bad link in MST is not retrained. Please also consider MST.
The issue ticket is 
https://gitlab.freedesktop.org/drm/i915/kernel/-/issues/10902.

        if (intel_dp->is_mst) {
                /*
                 * If we are in MST mode then this connector
                 * won't appear connected or have anything
                 * with EDID on it
                 */
                status = connector_status_disconnected;
                goto out;
        }

        /*
         * Some external monitors do not signal loss of link synchronization
         * with an IRQ_HPD, so force a link status check.
         */
        if (!intel_dp_is_edp(intel_dp)) {
                ret = intel_dp_retrain_link(encoder, ctx);
                if (ret)
                        return ret;
        }