drm/amd/display: only enable HDCP for DCN+

[Why]
We don't support HDCP for pre RAVEN asics

[How]
Check if we are RAVEN+. Use this to attach the content_protection
property, this way usermode can't try to enable HDCP on pre DCN asics.

Also we need to update the module on hpd so guard it aswell
Signed-off-by: Bhawanpreet Lakha <Bhawanpreet.Lakha@amd.com>
Reviewed-by: Harry Wentland <harry.wentland@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

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

@@ -737,14 +737,16 @@ static int amdgpu_dm_init(struct amdgpu_device *adev)
 	amdgpu_dm_init_color_mod();
 
 #ifdef CONFIG_DRM_AMD_DC_HDCP
-	adev->dm.hdcp_workqueue = hdcp_create_workqueue(&adev->psp, &init_params.cp_psp, adev->dm.dc);
+	if (adev->asic_type >= CHIP_RAVEN) {
+		adev->dm.hdcp_workqueue = hdcp_create_workqueue(&adev->psp, &init_params.cp_psp, adev->dm.dc);
 
-	if (!adev->dm.hdcp_workqueue)
-		DRM_ERROR("amdgpu: failed to initialize hdcp_workqueue.\n");
-	else
-		DRM_DEBUG_DRIVER("amdgpu: hdcp_workqueue init done %p.\n", adev->dm.hdcp_workqueue);
+		if (!adev->dm.hdcp_workqueue)
+			DRM_ERROR("amdgpu: failed to initialize hdcp_workqueue.\n");
+		else
+			DRM_DEBUG_DRIVER("amdgpu: hdcp_workqueue init done %p.\n", adev->dm.hdcp_workqueue);
 
-	dc_init_callbacks(adev->dm.dc, &init_params);
+		dc_init_callbacks(adev->dm.dc, &init_params);
+	}
 #endif
 	if (amdgpu_dm_initialize_drm_device(adev)) {
 		DRM_ERROR(
@@ -1506,7 +1508,8 @@ static void handle_hpd_irq(void *param)
 	mutex_lock(&aconnector->hpd_lock);
 
 #ifdef CONFIG_DRM_AMD_DC_HDCP
-	hdcp_reset_display(adev->dm.hdcp_workqueue, aconnector->dc_link->link_index);
+	if (adev->asic_type >= CHIP_RAVEN)
+		hdcp_reset_display(adev->dm.hdcp_workqueue, aconnector->dc_link->link_index);
 #endif
 	if (aconnector->fake_enable)
 		aconnector->fake_enable = false;
@@ -5152,7 +5155,8 @@ void amdgpu_dm_connector_init_helper(struct amdgpu_display_manager *dm,
 		drm_connector_attach_vrr_capable_property(
 			&aconnector->base);
 #ifdef CONFIG_DRM_AMD_DC_HDCP
-		drm_connector_attach_content_protection_property(&aconnector->base, false);
+		if (adev->asic_type >= CHIP_RAVEN)
+			drm_connector_attach_content_protection_property(&aconnector->base, false);
 #endif
 	}
 }