Although it's not unexpected for drm_dp_check_act_status() to fail due to DPCD read failures (as the hub may have just been unplugged suddenly), timeouts are a bit more worrying as they either mean we need a longer timeout value, or we aren't setting up payload allocations properly. So, let's start printing errors on timeouts.
Signed-off-by: Lyude Paul lyude@redhat.com Cc: Sean Paul sean@poorly.run --- drivers/gpu/drm/drm_dp_mst_topology.c | 8 ++++++-- 1 file changed, 6 insertions(+), 2 deletions(-)
diff --git a/drivers/gpu/drm/drm_dp_mst_topology.c b/drivers/gpu/drm/drm_dp_mst_topology.c index f313407374ed..3d0d373f6f91 100644 --- a/drivers/gpu/drm/drm_dp_mst_topology.c +++ b/drivers/gpu/drm/drm_dp_mst_topology.c @@ -4494,6 +4494,10 @@ int drm_dp_check_act_status(struct drm_dp_mst_topology_mgr *mgr) DP_PAYLOAD_TABLE_UPDATE_STATUS, &status); if (ret < 0) { + /* + * Failure here isn't unexpected - the hub may have + * just been unplugged + */ DRM_DEBUG_KMS("failed to read payload table status %d\n", ret); return ret; @@ -4505,8 +4509,8 @@ int drm_dp_check_act_status(struct drm_dp_mst_topology_mgr *mgr) } while (jiffies < timeout);
if (!(status & DP_PAYLOAD_ACT_HANDLED)) { - DRM_DEBUG_KMS("failed to get ACT bit %d after %dms\n", - status, timeout_ms); + DRM_ERROR("Failed to get ACT after %dms, last status: %02x\n", + timeout_ms, status); return -EINVAL; } return 0;