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path: root/drivers/gpu/drm/nouveau/nouveau_dp.c
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Diffstat (limited to 'drivers/gpu/drm/nouveau/nouveau_dp.c')
-rw-r--r--drivers/gpu/drm/nouveau/nouveau_dp.c23
1 files changed, 18 insertions, 5 deletions
diff --git a/drivers/gpu/drm/nouveau/nouveau_dp.c b/drivers/gpu/drm/nouveau/nouveau_dp.c
index 7de7707ec6a8..a72c45809484 100644
--- a/drivers/gpu/drm/nouveau/nouveau_dp.c
+++ b/drivers/gpu/drm/nouveau/nouveau_dp.c
@@ -225,12 +225,18 @@ nouveau_dp_detect(struct nouveau_connector *nv_connector,
u8 *dpcd = nv_encoder->dp.dpcd;
int ret = NOUVEAU_DP_NONE, hpd;
- /* If we've already read the DPCD on an eDP device, we don't need to
- * reread it as it won't change
+ /* eDP ports don't support hotplugging - so there's no point in probing eDP ports unless we
+ * haven't probed them once before.
*/
- if (connector->connector_type == DRM_MODE_CONNECTOR_eDP &&
- dpcd[DP_DPCD_REV] != 0)
- return NOUVEAU_DP_SST;
+ if (connector->connector_type == DRM_MODE_CONNECTOR_eDP) {
+ if (connector->status == connector_status_connected)
+ return NOUVEAU_DP_SST;
+ else if (connector->status == connector_status_disconnected)
+ return NOUVEAU_DP_NONE;
+ }
+
+ // Ensure that the aux bus is enabled for probing
+ drm_dp_dpcd_set_powered(&nv_connector->aux, true);
mutex_lock(&nv_encoder->dp.hpd_irq_lock);
if (mstm) {
@@ -293,6 +299,13 @@ out:
if (mstm && !mstm->suspended && ret != NOUVEAU_DP_MST)
nv50_mstm_remove(mstm);
+ /* GSP doesn't like when we try to do aux transactions on a port it considers disconnected,
+ * and since we don't really have a usecase for that anyway - just disable the aux bus here
+ * if we've decided the connector is disconnected
+ */
+ if (ret == NOUVEAU_DP_NONE)
+ drm_dp_dpcd_set_powered(&nv_connector->aux, false);
+
mutex_unlock(&nv_encoder->dp.hpd_irq_lock);
return ret;
}