drm/amd/display: Fix NULL pointer dereference

[Why]
On a mst branch with multi display setup, dc context is obselete
after updating the first stream. Referencing the same dc context
for the next stream update to fetch dc pointer leads to NULL
pointer dereference.

[How]
Get the dc pointer from the link rather than context.

Cc: Mario Limonciello <[email protected]>
Cc: Alex Deucher <[email protected]>
Reviewed-by: Charlene Liu <[email protected]>
Signed-off-by: Meenakshikumar Somasundaram <[email protected]>
Signed-off-by: Aurabindo Pillai <[email protected]>
Signed-off-by: Alex Deucher <[email protected]>
(cherry picked from commit dc69b48988b171d6ccb3a083607e4dff015e2c0d)
Cc: [email protected]

Author: Meenakshikumar Somasundaram

drivers/gpu/drm/amd/display/dc/link/accessories/link_dp_cts.c

@@ -78,6 +78,7 @@ static void dp_retrain_link_dp_test(struct dc_link *link,
 	struct audio_output audio_output[MAX_PIPES];
 	struct dc_stream_state *streams_on_link[MAX_PIPES];
 	int num_streams_on_link = 0;
+	struct dc *dc = (struct dc *)link->dc;
 
 	needs_divider_update = (link->dc->link_srv->dp_get_encoding_format(link_setting) !=
 	link->dc->link_srv->dp_get_encoding_format((const struct dc_link_settings *) &link->cur_link_settings));
@@ -150,7 +151,7 @@ static void dp_retrain_link_dp_test(struct dc_link *link,
 		if (streams_on_link[i] && streams_on_link[i]->link && streams_on_link[i]->link == link) {
 			stream_update.stream = streams_on_link[i];
 			stream_update.dpms_off = &dpms_off;
-			dc_update_planes_and_stream(state->clk_mgr->ctx->dc, NULL, 0, streams_on_link[i], &stream_update);
+			dc_update_planes_and_stream(dc, NULL, 0, streams_on_link[i], &stream_update);
 		}
 	}
 }