提交 c175cd16 编写于 作者: A Andrey Grodzovsky 提交者: Dave Airlie

drm/dp/mst: Reverse order of MST enable and clearing VC payload table.

On DELL U3014 if you clear the table before enabling MST it sometimes
hangs the receiver.
Signed-off-by: NAndrey Grodzovsky <Andrey.Grodzovsky@amd.com>
Reviewed-by: NHarry Wentland <harry.wentland@amd.com>
Cc: stable@vger.kernel.org
Acked-by: NAlex Deucher <alexander.deucher@amd.com>
Signed-off-by: NDave Airlie <airlied@redhat.com>
上级 5e93b820
......@@ -1998,6 +1998,12 @@ int drm_dp_mst_topology_mgr_set_mst(struct drm_dp_mst_topology_mgr *mgr, bool ms
mgr->mst_primary = mstb;
kref_get(&mgr->mst_primary->kref);
ret = drm_dp_dpcd_writeb(mgr->aux, DP_MSTM_CTRL,
DP_MST_EN | DP_UP_REQ_EN | DP_UPSTREAM_IS_SRC);
if (ret < 0) {
goto out_unlock;
}
{
struct drm_dp_payload reset_pay;
reset_pay.start_slot = 0;
......@@ -2005,12 +2011,6 @@ int drm_dp_mst_topology_mgr_set_mst(struct drm_dp_mst_topology_mgr *mgr, bool ms
drm_dp_dpcd_write_payload(mgr, 0, &reset_pay);
}
ret = drm_dp_dpcd_writeb(mgr->aux, DP_MSTM_CTRL,
DP_MST_EN | DP_UP_REQ_EN | DP_UPSTREAM_IS_SRC);
if (ret < 0) {
goto out_unlock;
}
queue_work(system_long_wq, &mgr->work);
ret = 0;
......
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