drm/amd/display: Only use analog link encoder with analog engine

[ Upstream commit f402898 ]

Some GPUs have analog connectors that work with a DP bridge chip
and don't actually have an internal DAC: Those should not use
the analog link encoder code path.

Fixes: 0fbe321 ("drm/amd/display: Implement DCE analog link encoders (v2)")
Signed-off-by: Timur Kristóf <timur.kristof@gmail.com>
Reviewed-by: Alex Hung <alex.hung@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>

Author: Timur Kristóf

drivers/gpu/drm/amd/display/dc/resource/dce100/dce100_resource.c

@@ -638,7 +638,8 @@ static struct link_encoder *dce100_link_encoder_create(
 	if (!enc110)
 		return NULL;
 
-	if (enc_init_data->connector.id == CONNECTOR_ID_VGA) {
+	if (enc_init_data->connector.id == CONNECTOR_ID_VGA &&
+	    enc_init_data->analog_engine != ENGINE_ID_UNKNOWN) {
 		dce110_link_encoder_construct(enc110,
 			enc_init_data,
 			&link_enc_feature,

drivers/gpu/drm/amd/display/dc/resource/dce60/dce60_resource.c

@@ -733,7 +733,8 @@ static struct link_encoder *dce60_link_encoder_create(
 	if (!enc110)
 		return NULL;
 
-	if (enc_init_data->connector.id == CONNECTOR_ID_VGA) {
+	if (enc_init_data->connector.id == CONNECTOR_ID_VGA &&
+	    enc_init_data->analog_engine != ENGINE_ID_UNKNOWN) {
 		dce60_link_encoder_construct(enc110,
 			enc_init_data,
 			&link_enc_feature,

drivers/gpu/drm/amd/display/dc/resource/dce80/dce80_resource.c

@@ -740,7 +740,8 @@ static struct link_encoder *dce80_link_encoder_create(
 	if (!enc110)
 		return NULL;
 
-	if (enc_init_data->connector.id == CONNECTOR_ID_VGA) {
+	if (enc_init_data->connector.id == CONNECTOR_ID_VGA &&
+	    enc_init_data->analog_engine != ENGINE_ID_UNKNOWN) {
 		dce110_link_encoder_construct(enc110,
 			enc_init_data,
 			&link_enc_feature,