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drm/dp_mst: Use drm_dp_dpcd_write_data() to write GUID for non-root MST branch devices

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drm_dp_dpcd_write_data() can be used to write the GUID for a non-root
MST branch device, similarly to writing the GUID to a root MST branch
device, do so.

Cc: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Cc: Lyude Paul <lyude@redhat.com>
Reviewed-by: Lyude Paul <lyude@redhat.com>
Signed-off-by: Imre Deak <imre.deak@intel.com>
Link: https://lore.kernel.org/r/20250401103846.686408-2-imre.deak@intel.com
This commit is contained in:
Imre Deak
2025-04-03 17:14:19 +03:00
parent aea007741b
commit a73d71366e
1 changed files with 7 additions and 10 deletions
Download Patch File Download Diff File Expand all files Collapse all files
drivers/gpu/drm/display/drm_dp_mst_topology.c
+7 -10
View File
@@ -2192,20 +2192,17 @@ static int drm_dp_check_mstb_guid(struct drm_dp_mst_branch *mstb, guid_t *guid)
guid_copy(&mstb->guid, guid);
if (!drm_dp_validate_guid(mstb->mgr, &mstb->guid)) {
struct drm_dp_aux *aux;
u8 buf[UUID_SIZE];
export_guid(buf, &mstb->guid);
if (mstb->port_parent) {
ret = drm_dp_send_dpcd_write(mstb->mgr,
mstb->port_parent,
DP_GUID, sizeof(buf), buf);
if (ret >= 0)
ret = ret == sizeof(buf) ? 0 : -EPROTO;
} else {
ret = drm_dp_dpcd_write_data(mstb->mgr->aux,
DP_GUID, buf, sizeof(buf));
}
if (mstb->port_parent)
aux = &mstb->port_parent->aux;
else
aux = mstb->mgr->aux;
ret = drm_dp_dpcd_write_data(aux, DP_GUID, buf, sizeof(buf));
}
return ret;