drm/tegra: dc: Fix possible_crtcs mask for planes

Cursor and overlay planes use a possible_crtcs mask based on the DC pipe
number. However, DRM requires each bit in the mask to correspond to the
index of the CRTC, which will be different from the DC pipe number for a
configuration where the first display controller is disabled, or where a
deferred probe leads to the first display controller being probed after
the first.
Suggested-by: Dmitry Osipenko <digetx@gmail.com>
Signed-off-by: Thierry Reding <treding@nvidia.com>

drivers/gpu/drm/tegra/dc.c

@@ -572,8 +572,7 @@ static const struct drm_plane_helper_funcs tegra_plane_helper_funcs = {
 	.atomic_update = tegra_plane_atomic_update,
 };
 
-static struct drm_plane *tegra_primary_plane_create(struct drm_device *drm,
-						    struct tegra_dc *dc)
+static unsigned long tegra_plane_get_possible_crtcs(struct drm_device *drm)
 {
 	/*
 	 * Ideally this would use drm_crtc_mask(), but that would require the
@@ -587,7 +586,13 @@ static struct drm_plane *tegra_primary_plane_create(struct drm_device *drm,
 	 * of CRTCs that have been registered, and should therefore always be
 	 * the same as drm_crtc_index() after registration.
 	 */
-	unsigned long possible_crtcs = 1 << drm->mode_config.num_crtc;
+	return 1 << drm->mode_config.num_crtc;
+}
+
+static struct drm_plane *tegra_primary_plane_create(struct drm_device *drm,
+						    struct tegra_dc *dc)
+{
+	unsigned long possible_crtcs = tegra_plane_get_possible_crtcs(drm);
 	enum drm_plane_type type = DRM_PLANE_TYPE_PRIMARY;
 	struct tegra_plane *plane;
 	unsigned int num_formats;
@@ -744,6 +749,7 @@ static const struct drm_plane_helper_funcs tegra_cursor_plane_helper_funcs = {
 static struct drm_plane *tegra_dc_cursor_plane_create(struct drm_device *drm,
 						      struct tegra_dc *dc)
 {
+	unsigned long possible_crtcs = tegra_plane_get_possible_crtcs(drm);
 	struct tegra_plane *plane;
 	unsigned int num_formats;
 	const u32 *formats;
@@ -766,7 +772,7 @@ static struct drm_plane *tegra_dc_cursor_plane_create(struct drm_device *drm,
 	num_formats = ARRAY_SIZE(tegra_cursor_plane_formats);
 	formats = tegra_cursor_plane_formats;
 
-	err = drm_universal_plane_init(drm, &plane->base, 1 << dc->pipe,
+	err = drm_universal_plane_init(drm, &plane->base, possible_crtcs,
 				       &tegra_plane_funcs, formats,
 				       num_formats, NULL,
 				       DRM_PLANE_TYPE_CURSOR, NULL);
@@ -860,6 +866,7 @@ static struct drm_plane *tegra_dc_overlay_plane_create(struct drm_device *drm,
 						       struct tegra_dc *dc,
 						       unsigned int index)
 {
+	unsigned long possible_crtcs = tegra_plane_get_possible_crtcs(drm);
 	struct tegra_plane *plane;
 	unsigned int num_formats;
 	const u32 *formats;
@@ -876,7 +883,7 @@ static struct drm_plane *tegra_dc_overlay_plane_create(struct drm_device *drm,
 	num_formats = dc->soc->num_overlay_formats;
 	formats = dc->soc->overlay_formats;
 
-	err = drm_universal_plane_init(drm, &plane->base, 1 << dc->pipe,
+	err = drm_universal_plane_init(drm, &plane->base, possible_crtcs,
 				       &tegra_plane_funcs, formats,
 				       num_formats, NULL,
 				       DRM_PLANE_TYPE_OVERLAY, NULL);