[PATCH 06/16] drm/amd/display: Read DP tunneling support only for DPIA endpoints

[Hamza Mahfooz]

From: Aurabindo Pillai <aurabindo.pillai at amd.com>

Unconditionally reading DP tunneling support results in extraneous
errors messages on certain devices. Fix this by guarding the DPCD read
for DP tunneling support for USB4 DPIA endpoints.

Reviewed-by: Meenakshikumar Somasundaram <meenakshikumar.somasundaram at amd.com>
Signed-off-by: Aurabindo Pillai <aurabindo.pillai at amd.com>
Signed-off-by: Hamza Mahfooz <hamza.mahfooz at amd.com>
---
 .../amd/display/dc/link/protocols/link_dp_capability.c    | 8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)

diff --git a/drivers/gpu/drm/amd/display/dc/link/protocols/link_dp_capability.c b/drivers/gpu/drm/amd/display/dc/link/protocols/link_dp_capability.c
index 72ef0c3a7ebd..9dabaf682171 100644
--- a/drivers/gpu/drm/amd/display/dc/link/protocols/link_dp_capability.c
+++ b/drivers/gpu/drm/amd/display/dc/link/protocols/link_dp_capability.c
@@ -1633,9 +1633,11 @@ static bool retrieve_link_cap(struct dc_link *link)
 	}
 
 	/* Read DP tunneling information. */
-	status = dpcd_get_tunneling_device_data(link);
-	if (status != DC_OK)
-		dm_error("%s: Read tunneling device data failed.\n", __func__);
+	if (link->ep_type == DISPLAY_ENDPOINT_USB4_DPIA) {
+		status = dpcd_get_tunneling_device_data(link);
+		if (status != DC_OK)
+			dm_error("%s: Read tunneling device data failed.\n", __func__);
+	}
 
 	dpcd_set_source_specific_data(link);
 	/* Sink may need to configure internals based on vendor, so allow some
-- 
2.46.1