[PATCH 14/14] drm/amd/display: Fix error in dmesg at boot

[Solomon Chiu]

From: "Leo (Hanghong) Ma" <hanghong...@amd.com>

[Why]
During DQE's promotion test, error appears in dmesg at boot
on dcn3.1;

[How]
Add NULL pointor check for the pointor to the amdgpu_dm_connector;

Reviewed-by: Nicholas Kazlauskas <nicholas.kazlaus...@amd.com>
Acked-by: Solomon Chiu <solomon.c...@amd.com>
Signed-off-by: Leo (Hanghong) Ma <hanghong...@amd.com>
---
 drivers/gpu/drm/amd/display/dc/core/dc_link.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/amd/display/dc/core/dc_link.c 
b/drivers/gpu/drm/amd/display/dc/core/dc_link.c
index 81bf1e5a64c8..64b9c493dce2 100644
--- a/drivers/gpu/drm/amd/display/dc/core/dc_link.c
+++ b/drivers/gpu/drm/amd/display/dc/core/dc_link.c
@@ -1917,7 +1917,7 @@ void blank_all_dp_displays(struct dc *dc, bool hw_init)
 
                if ((signal == SIGNAL_TYPE_EDP) ||
                        (signal == SIGNAL_TYPE_DISPLAY_PORT)) {
-                       if (hw_init && signal != SIGNAL_TYPE_EDP) {
+                       if (hw_init && signal != SIGNAL_TYPE_EDP && 
dc->links[i]->priv != NULL) {
                                /* DP 2.0 spec requires that we read LTTPR caps 
first */
                                dp_retrieve_lttpr_cap(dc->links[i]);
                                /* if any of the displays are lit up turn them 
off */
@@ -1943,7 +1943,7 @@ void blank_all_dp_displays(struct dc *dc, bool hw_init)
                                }
 
                                if 
(!dc->links[i]->wa_flags.dp_keep_receiver_powered ||
-                                       (hw_init && signal != SIGNAL_TYPE_EDP))
+                                       (hw_init && signal != SIGNAL_TYPE_EDP 
&& dc->links[i]->priv != NULL))
                                        dp_receiver_power_ctrl(dc->links[i], 
false);
                        }
                }
-- 
2.25.1