drm/qxl: use suggested x/y offset properties to pass guest prefs

This passes the guest preferences for a where to place the
outputs through to userspace. Userspace would need to be updated
to take note of this information, X server and GNOME.

Signed-off-by: Dave Airlie <airlied@redhat.com>

1 files changed, 28 insertions, 0 deletions

diff --git a/drivers/gpu/drm/qxl/qxl_display.c b/drivers/gpu/drm/qxl/qxl_display.c
index 8b7892880ad2..b8cf556b431c 100644
--- a/drivers/gpu/drm/qxl/qxl_display.c
+++ b/drivers/gpu/drm/qxl/qxl_display.c
@@ -101,14 +101,37 @@ static int qxl_display_copy_rom_client_monitors_config(struct qxl_device *qdev)
         return 0;
 }
 
+static void qxl_update_offset_props(struct qxl_device *qdev)
+{
+        struct drm_device *dev = qdev->ddev;
+        struct drm_connector *connector;
+        struct qxl_output *output;
+        struct qxl_head *head;
+
+        list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
+                output = drm_connector_to_qxl_output(connector);
+
+                head = &qdev->client_monitors_config->heads[output->index];
+
+                drm_object_property_set_value(&connector->base,
+                        dev->mode_config.suggested_x_property, head->x);
+                drm_object_property_set_value(&connector->base,
+                        dev->mode_config.suggested_y_property, head->y);
+        }
+}
+
 void qxl_display_read_client_monitors_config(struct qxl_device *qdev)
 {
 
+        struct drm_device *dev = qdev->ddev;
         while (qxl_display_copy_rom_client_monitors_config(qdev)) {
                 qxl_io_log(qdev, "failed crc check for client_monitors_config,"
                                  " retrying\n");
         }
 
+        drm_modeset_lock_all(dev);
+        qxl_update_offset_props(qdev);
+        drm_modeset_unlock_all(dev);
         if (!drm_helper_hpd_irq_event(qdev->ddev)) {
                 /* notify that the monitor configuration changed, to
                    adjust at the arbitrary resolution */
@@ -952,6 +975,10 @@ static int qdev_output_init(struct drm_device *dev, int num_output)
 
         drm_object_attach_property(&connector->base,
                                    qdev->hotplug_mode_update_property, 0);
+        drm_object_attach_property(&connector->base,
+                                   dev->mode_config.suggested_x_property, 0);
+        drm_object_attach_property(&connector->base,
+                                   dev->mode_config.suggested_y_property, 0);
         drm_connector_register(connector);
         return 0;
 }
@@ -1065,6 +1092,7 @@ int qxl_modeset_init(struct qxl_device *qdev)
 
         qdev->ddev->mode_config.fb_base = qdev->vram_base;
 
+        drm_mode_create_suggested_offset_properties(qdev->ddev);
         qxl_mode_create_hotplug_mode_update_property(qdev);
 
         for (i = 0 ; i < qxl_num_crtc; ++i) {