drm: add tile_group support. (v3)

A tile group is an identifier shared by a single monitor,
DisplayID topology has 8 bytes we can use for this, just
use those for now until something else comes up in the
future. We assign these to an idr and use the idr to
tell userspace what connectors are in the same tile group.

DisplayID v1.3 says the serial number must be unique for
displays from the same manufacturer.

v2:
destroy idr (dvdhrm)
add docbook (danvet)
airlied:- not sure how to make docbook add fns to tile group section.

v3: fix missing unlock.

Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Signed-off-by: Dave Airlie <airlied@redhat.com>

1 files changed, 16 insertions, 0 deletions

diff --git a/include/drm/drm_crtc.h b/include/drm/drm_crtc.h
index dd2c16e43333..8f760a2373f9 100644
--- a/include/drm/drm_crtc.h
+++ b/include/drm/drm_crtc.h
@@ -137,6 +137,14 @@ struct drm_display_info {
         u8 cea_rev;
 };
 
+/* data corresponds to displayid vend/prod/serial */
+struct drm_tile_group {
+        struct kref refcount;
+        struct drm_device *dev;
+        int id;
+        u8 group_data[8];
+};
+
 struct drm_framebuffer_funcs {
         /* note: use drm_framebuffer_remove() */
         void (*destroy)(struct drm_framebuffer *framebuffer);
@@ -978,6 +986,7 @@ struct drm_mode_config {
         struct drm_modeset_acquire_ctx *acquire_ctx; /* for legacy _lock_all() / _unlock_all() */
         struct mutex idr_mutex; /* for IDR management */
         struct idr crtc_idr; /* use this idr for all IDs, fb, crtc, connector, modes - just makes life easier */
+        struct idr tile_idr; /* use this idr for all IDs, fb, crtc, connector, modes - just makes life easier */
         /* this is limited to one for now */
 
         struct mutex fb_lock; /* proctects global and per-file fb lists */
@@ -1326,6 +1335,13 @@ extern void drm_set_preferred_mode(struct drm_connector *connector,
 extern int drm_edid_header_is_valid(const u8 *raw_edid);
 extern bool drm_edid_block_valid(u8 *raw_edid, int block, bool print_bad_edid);
 extern bool drm_edid_is_valid(struct edid *edid);
+
+extern struct drm_tile_group *drm_mode_create_tile_group(struct drm_device *dev,
+                                                         char topology[8]);
+extern struct drm_tile_group *drm_mode_get_tile_group(struct drm_device *dev,
+                                               char topology[8]);
+extern void drm_mode_put_tile_group(struct drm_device *dev,
+                                   struct drm_tile_group *tg);
 struct drm_display_mode *drm_mode_find_dmt(struct drm_device *dev,
                                            int hsize, int vsize, int fresh,
                                            bool rb);