XXX: WIP: drm: Universal display rotation on Nexus 7

This removes a need to have bleeding edge userspace that knows how to
work with the rotated planes. Only Opentegra driver supports planes rotation
today, everything else is upside-down without the universal rotation support.

The plan is to teach DRM core about the CRTC rotation capabilities and then
this hack won't be needed, for now it's not obvious how to implement that.

Signed-off-by: Dmitry Osipenko <digetx@gmail.com>

drivers/gpu/drm/drm_connector.c

@@ -2362,6 +2362,10 @@ int drm_connector_set_panel_orientation(
 	struct drm_display_info *info = &connector->display_info;
 	struct drm_property *prop;
 
+	/* Temporal hack for Nexus 7 */
+	if (of_machine_is_compatible("asus,grouper"))
+		return 0;
+
 	/* Already set? */
 	if (info->panel_orientation != DRM_MODE_PANEL_ORIENTATION_UNKNOWN)
 		return 0;

drivers/gpu/drm/grate/dc.c

@@ -763,6 +763,14 @@ static void tegra_plane_atomic_update(struct drm_plane *plane,
 	window.format = tegra_plane_state->format;
 	window.swap = tegra_plane_state->swap;
 
+	if (of_machine_is_compatible("asus,grouper")) {
+		struct drm_display_mode *mode = &plane->state->crtc->state->adjusted_mode;
+		window.dst.x = mode->hdisplay - window.dst.w - window.dst.x;
+		window.dst.y = mode->vdisplay - window.dst.h - window.dst.y;
+		window.reflect_x = !window.reflect_x;
+		window.reflect_y = !window.reflect_y;
+	}
+
 	for (i = 0; i < fb->format->num_planes; i++) {
 		window.base[i] = tegra_plane_state->iova[i] + fb->offsets[i];
 

drivers/gpu/drm/tegra/dc.c

@@ -753,6 +753,14 @@ static void tegra_plane_atomic_update(struct drm_plane *plane,
 	window.format = tegra_plane_state->format;
 	window.swap = tegra_plane_state->swap;
 
+	if (of_machine_is_compatible("asus,grouper")) {
+		struct drm_display_mode *mode = &plane->state->crtc->state->adjusted_mode;
+		window.dst.x = mode->hdisplay - window.dst.w - window.dst.x;
+		window.dst.y = mode->vdisplay - window.dst.h - window.dst.y;
+		window.reflect_x = !window.reflect_x;
+		window.reflect_y = !window.reflect_y;
+	}
+
 	for (i = 0; i < fb->format->num_planes; i++) {
 		window.base[i] = tegra_plane_state->iova[i] + fb->offsets[i];