drm/edid: add drm_edid_connector_update()

Add a new function drm_edid_connector_update() to replace the
combination of calls drm_connector_update_edid_property() and
drm_add_edid_modes(). Usually they are called in the drivers in this
order, however the former needs information from the latter.

Since the new drm_edid_read*() functions no longer call the connector
updates directly, and the read and update are separated, we'll need this
new function for the connector update.

This is all in drm_edid.c simply to keep struct drm_edid opaque.

v2:
- Share code with drm_connector_update_edid_property() (Ville)
- Add comment about override EDID handling

Signed-off-by: Jani Nikula <jani.nikula@intel.com>
Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/75aa3dbc8c9aa26ebbcdeacd98a466ef8d8827f4.1656494768.git.jani.nikula@intel.com

diff --git a/drivers/gpu/drm/drm_edid.c b/drivers/gpu/drm/drm_edid.c
index c3f0f0a..41b3de5 100644 (file)
--- a/drivers/gpu/drm/drm_edid.c
+++ b/drivers/gpu/drm/drm_edid.c
@@ -6160,8 +6160,8 @@ static int add_displayid_detailed_modes(struct drm_connector *connector,
        return num_modes;
 }
 
-static int drm_edid_connector_update(struct drm_connector *connector,
-                                    const struct drm_edid *drm_edid)
+static int _drm_edid_connector_update(struct drm_connector *connector,
+                                     const struct drm_edid *drm_edid)
 {
        int num_modes = 0;
        u32 quirks;
@@ -6227,31 +6227,12 @@ static int drm_edid_connector_update(struct drm_connector *connector,
 static void _drm_update_tile_info(struct drm_connector *connector,
                                  const struct drm_edid *drm_edid);
 
-static int _drm_connector_update_edid_property(struct drm_connector *connector,
+static int _drm_edid_connector_property_update(struct drm_connector *connector,
                                               const struct drm_edid *drm_edid)
 {
        struct drm_device *dev = connector->dev;
        int ret;
 
-       /* ignore requests to set edid when overridden */
-       if (connector->override_edid)
-               return 0;
-
-       /*
-        * Set the display info, using edid if available, otherwise resetting
-        * the values to defaults. This duplicates the work done in
-        * drm_add_edid_modes, but that function is not consistently called
-        * before this one in all drivers and the computation is cheap enough
-        * that it seems better to duplicate it rather than attempt to ensure
-        * some arbitrary ordering of calls.
-        */
-       if (drm_edid)
-               update_display_info(connector, drm_edid);
-       else
-               drm_reset_display_info(connector);
-
-       _drm_update_tile_info(connector, drm_edid);
-
        if (connector->edid_blob_ptr) {
                const struct edid *old_edid = connector->edid_blob_ptr->data;
 
@@ -6298,6 +6279,76 @@ out:
 }
 
 /**
+ * drm_edid_connector_update - Update connector information from EDID
+ * @connector: Connector
+ * @drm_edid: EDID
+ *
+ * Update the connector mode list, display info, ELD, HDR metadata, relevant
+ * properties, etc. from the passed in EDID.
+ *
+ * If EDID is NULL, reset the information.
+ *
+ * Return: The number of modes added or 0 if we couldn't find any.
+ */
+int drm_edid_connector_update(struct drm_connector *connector,
+                             const struct drm_edid *drm_edid)
+{
+       int count;
+
+       /*
+        * FIXME: Reconcile the differences in override_edid handling between
+        * this and drm_connector_update_edid_property().
+        *
+        * If override_edid is set, and the EDID passed in here originates from
+        * drm_edid_read() and friends, it will be the override EDID, and there
+        * are no issues. drm_connector_update_edid_property() ignoring requests
+        * to set the EDID dates back to a time when override EDID was not
+        * handled at the low level EDID read.
+        *
+        * The only way the EDID passed in here can be different from the
+        * override EDID is when a driver passes in an EDID that does *not*
+        * originate from drm_edid_read() and friends, or passes in a stale
+        * cached version. This, in turn, is a question of when an override EDID
+        * set via debugfs should take effect.
+        */
+
+       count = _drm_edid_connector_update(connector, drm_edid);
+
+       _drm_update_tile_info(connector, drm_edid);
+
+       /* Note: Ignore errors for now. */
+       _drm_edid_connector_property_update(connector, drm_edid);
+
+       return count;
+}
+EXPORT_SYMBOL(drm_edid_connector_update);
+
+static int _drm_connector_update_edid_property(struct drm_connector *connector,
+                                              const struct drm_edid *drm_edid)
+{
+       /* ignore requests to set edid when overridden */
+       if (connector->override_edid)
+               return 0;
+
+       /*
+        * Set the display info, using edid if available, otherwise resetting
+        * the values to defaults. This duplicates the work done in
+        * drm_add_edid_modes, but that function is not consistently called
+        * before this one in all drivers and the computation is cheap enough
+        * that it seems better to duplicate it rather than attempt to ensure
+        * some arbitrary ordering of calls.
+        */
+       if (drm_edid)
+               update_display_info(connector, drm_edid);
+       else
+               drm_reset_display_info(connector);
+
+       _drm_update_tile_info(connector, drm_edid);
+
+       return _drm_edid_connector_property_update(connector, drm_edid);
+}
+
+/**
  * drm_connector_update_edid_property - update the edid property of a connector
  * @connector: drm connector
  * @edid: new value of the edid property
@@ -6308,6 +6359,8 @@ out:
  * set the connector's tile property here. See drm_connector_set_tile_property()
  * for more details.
  *
+ * This function is deprecated. Use drm_edid_connector_update() instead.
+ *
  * Returns:
  * Zero on success, negative errno on failure.
  */
@@ -6330,6 +6383,8 @@ EXPORT_SYMBOL(drm_connector_update_edid_property);
  * &drm_display_info structure and ELD in @connector with any information which
  * can be derived from the edid.
  *
+ * This function is deprecated. Use drm_edid_connector_update() instead.
+ *
  * Return: The number of modes added or 0 if we couldn't find any.
  */
 int drm_add_edid_modes(struct drm_connector *connector, struct edid *edid)
@@ -6342,8 +6397,8 @@ int drm_add_edid_modes(struct drm_connector *connector, struct edid *edid)
                edid = NULL;
        }
 
-       return drm_edid_connector_update(connector,
-                                        drm_edid_legacy_init(&drm_edid, edid));
+       return _drm_edid_connector_update(connector,
+                                         drm_edid_legacy_init(&drm_edid, edid));
 }
 EXPORT_SYMBOL(drm_add_edid_modes);
 

diff --git a/include/drm/drm_edid.h b/include/drm/drm_edid.h
index 9d2d781..aeb2fa9 100644 (file)
--- a/include/drm/drm_edid.h
+++ b/include/drm/drm_edid.h
@@ -603,6 +603,8 @@ const struct drm_edid *drm_edid_read_ddc(struct drm_connector *connector,
 const struct drm_edid *drm_edid_read_custom(struct drm_connector *connector,
                                            int (*read_block)(void *context, u8 *buf, unsigned int block, size_t len),
                                            void *context);
+int drm_edid_connector_update(struct drm_connector *connector,
+                             const struct drm_edid *edid);
 const u8 *drm_find_edid_extension(const struct drm_edid *drm_edid,
                                  int ext_id, int *ext_index);