drm: Introduce drm_bridge_mode_valid()

Introduce a new helper function which calls mode_valid() callback
for all bridges in an encoder chain.

Signed-off-by: Jose Abreu <[email protected]>
Reviewed-by: Daniel Vetter <[email protected]>
Cc: Carlos Palminha <[email protected]>
Cc: Ville Syrjälä <[email protected]>
Cc: Dave Airlie <[email protected]>
Cc: Andrzej Hajda <[email protected]>
Cc: Archit Taneja <[email protected]>
Cc: Laurent Pinchart <[email protected]>
Reviewed-by: Archit Taneja <[email protected]>
Signed-off-by: Daniel Vetter <[email protected]>
Link: http://patchwork.freedesktop.org/patch/msgid/36bd5e054496ad3c9c71f1ffe204f28533f55f1e.1495720737.git.joabreu@synopsys.com

diff --git a/drivers/gpu/drm/drm_bridge.c b/drivers/gpu/drm/drm_bridge.c
index 86a7637ba344c586203d6bed0058a556a30f0edd..dc8cdfe1dcacf6dfd2b5e987888820f2524f02a8 100644 (file)
--- a/drivers/gpu/drm/drm_bridge.c
+++ b/drivers/gpu/drm/drm_bridge.c
@@ -205,6 +205,39 @@ bool drm_bridge_mode_fixup(struct drm_bridge *bridge,
 }
 EXPORT_SYMBOL(drm_bridge_mode_fixup);
 
+/**
+ * drm_bridge_mode_valid - validate the mode against all bridges in the
+ *                        encoder chain.
+ * @bridge: bridge control structure
+ * @mode: desired mode to be validated
+ *
+ * Calls &drm_bridge_funcs.mode_valid for all the bridges in the encoder
+ * chain, starting from the first bridge to the last. If at least one bridge
+ * does not accept the mode the function returns the error code.
+ *
+ * Note: the bridge passed should be the one closest to the encoder.
+ *
+ * RETURNS:
+ * MODE_OK on success, drm_mode_status Enum error code on failure
+ */
+enum drm_mode_status drm_bridge_mode_valid(struct drm_bridge *bridge,
+                                          const struct drm_display_mode *mode)
+{
+       enum drm_mode_status ret = MODE_OK;
+
+       if (!bridge)
+               return ret;
+
+       if (bridge->funcs->mode_valid)
+               ret = bridge->funcs->mode_valid(bridge, mode);
+
+       if (ret != MODE_OK)
+               return ret;
+
+       return drm_bridge_mode_valid(bridge->next, mode);
+}
+EXPORT_SYMBOL(drm_bridge_mode_valid);
+
 /**
  * drm_bridge_disable - disables all bridges in the encoder chain
  * @bridge: bridge control structure

diff --git a/include/drm/drm_bridge.h b/include/drm/drm_bridge.h
index 983054f2e86ec5b40eb9eb11e049180332bd3d19..5b106eca6d573a96138274eb38941089401fe4b0 100644 (file)
--- a/include/drm/drm_bridge.h
+++ b/include/drm/drm_bridge.h
@@ -253,6 +253,8 @@ int drm_bridge_attach(struct drm_encoder *encoder, struct drm_bridge *bridge,
 bool drm_bridge_mode_fixup(struct drm_bridge *bridge,
                        const struct drm_display_mode *mode,
                        struct drm_display_mode *adjusted_mode);
+enum drm_mode_status drm_bridge_mode_valid(struct drm_bridge *bridge,
+                                          const struct drm_display_mode *mode);
 void drm_bridge_disable(struct drm_bridge *bridge);
 void drm_bridge_post_disable(struct drm_bridge *bridge);
 void drm_bridge_mode_set(struct drm_bridge *bridge,