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Revert "drm/dp_mst: Retrieve extended DPCD caps for topology manager"

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This reverts commit ad44c03208.

Currently DRM driver assume the source device caps is higher than the MST device
caps. With this commit, this statement would be broken.

e.g. the source device only support DP1.2 and the mst device support DP1.4.

Signed-off-by: Koba Ko <[email protected]>
Reviewed-by: Lyude Paul <[email protected]>
Signed-off-by: Lyude Paul <[email protected]>
Link: https://patchwork.freedesktop.org/patch/msgid/[email protected]
This commit is contained in:
Koba Ko authored and Lyude Paul committed 2020-11-10 12:41:01 -05:00
1 parent 23d6ab1d4c
commit 2dcab875e7
1 file changed
+3 -4
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drivers/gpu/drm/drm_dp_mst_topology.c
+3 -4
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@@ -3686,10 +3686,9 @@ int drm_dp_mst_topology_mgr_set_mst(struct drm_dp_mst_topology_mgr *mgr, bool ms
WARN_ON(mgr->mst_primary);
/* get dpcd info */
ret = drm_dp_read_dpcd_caps(mgr->aux, mgr->dpcd);
if (ret < 0) {
drm_dbg_kms(mgr->dev, "%s: failed to read DPCD, ret %d\n",
mgr->aux->name, ret);
ret = drm_dp_dpcd_read(mgr->aux, DP_DPCD_REV, mgr->dpcd, DP_RECEIVER_CAP_SIZE);
if (ret != DP_RECEIVER_CAP_SIZE) {
DRM_DEBUG_KMS("failed to read DPCD\n");
goto out_unlock;
}