drm/amd/display: Fix incorrect HDCP caps for dongle

[Why]
Previously we used link signal type to get the caps. We should use the
sink signal type

[How]
Use sink signal type instead of link signal type

Signed-off-by: Bhawanpreet Lakha <[e-mail]>
Reviewed-by: Wenjing Liu <[e-mail]>
Acked-by: Qingqing Zhuo <[e-mail]>
Signed-off-by: Alex Deucher <[e-mail]>

drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_debugfs.c

···
 
 	seq_printf(m, "%s:%d HDCP version: ", connector->name, connector->base.id);
 
-	hdcp_cap = dc_link_is_hdcp14(aconnector->dc_link);
-	hdcp2_cap = dc_link_is_hdcp22(aconnector->dc_link);
+	hdcp_cap = dc_link_is_hdcp14(aconnector->dc_link, aconnector->dc_sink->sink_signal);
+	hdcp2_cap = dc_link_is_hdcp22(aconnector->dc_link, aconnector->dc_sink->sink_signal);
 
 
 	if (hdcp_cap)

drivers/gpu/drm/amd/display/dc/core/dc_link.c

···
 }
 
 #if defined(CONFIG_DRM_AMD_DC_HDCP)
-bool dc_link_is_hdcp14(struct dc_link *link)
+bool dc_link_is_hdcp14(struct dc_link *link, enum signal_type signal)
 {
 	bool ret = false;
 
-	switch (link->connector_signal)	{
+	switch (signal)	{
 	case SIGNAL_TYPE_DISPLAY_PORT:
 	case SIGNAL_TYPE_DISPLAY_PORT_MST:
 		ret = link->hdcp_caps.bcaps.bits.HDCP_CAPABLE;
···
 	return ret;
 }
 
-bool dc_link_is_hdcp22(struct dc_link *link)
+bool dc_link_is_hdcp22(struct dc_link *link, enum signal_type signal)
 {
 	bool ret = false;
 
-	switch (link->connector_signal)	{
+	switch (signal)	{
 	case SIGNAL_TYPE_DISPLAY_PORT:
 	case SIGNAL_TYPE_DISPLAY_PORT_MST:
 		ret = (link->hdcp_caps.bcaps.bits.HDCP_CAPABLE &&

drivers/gpu/drm/amd/display/dc/dc_link.h

···
  */
 
 #ifdef CONFIG_DRM_AMD_DC_HDCP
-bool dc_link_is_hdcp14(struct dc_link *link);
-bool dc_link_is_hdcp22(struct dc_link *link);
+bool dc_link_is_hdcp14(struct dc_link *link, enum signal_type signal);
+bool dc_link_is_hdcp22(struct dc_link *link, enum signal_type signal);
 #endif
 void dc_link_set_drive_settings(struct dc *dc,
 				struct link_training_settings *lt_settings,