WebSVN – Kolibri OS – Diff – /drivers/video/drm/drm_bridge.c

 #include "drm/drmP.h"
 /**
  * DOC: overview
  *
- * drm_bridge represents a device that hangs on to an encoder. These are handy
+ * struct &drm_bridge represents a device that hangs on to an encoder. These are
- * when a regular drm_encoder entity isn't enough to represent the entire
+ * handy when a regular &drm_encoder entity isn't enough to represent the entire
  * encoder chain.
  *
- * A bridge is always associated to a single drm_encoder at a time, but can be
+ * A bridge is always attached to a single &drm_encoder at a time, but can be
  * either connected to it directly, or through an intermediate bridge:
+ *
  * encoder ---> bridge B ---> bridge A
+ *
  * Here, the output of the encoder feeds to bridge B, and that furthers feeds to
  * bridge A.
+ *
  * The driver using the bridge is responsible to make the associations between
  * the encoder and bridges. Once these links are made, the bridges will
  * participate along with encoder functions to perform mode_set/enable/disable
- * through the ops provided in drm_bridge_funcs.
+ * through the ops provided in &drm_bridge_funcs.
+ *
  * drm_bridge, like drm_panel, aren't drm_mode_object entities like planes,
- * crtcs, encoders or connectors. They just provide additional hooks to get the
+ * CRTCs, encoders or connectors and hence are not visible to userspace. They
+ * just provide additional hooks to get the desired output at the end of the
+ * encoder chain.
+ *
+ * Bridges can also be chained up using the next pointer in struct &drm_bridge.
+ *
- * desired output at the end of the encoder chain.
+ * Both legacy CRTC helpers and the new atomic modeset helpers support bridges.
  */
 EXPORT_SYMBOL(drm_bridge_attach);
 /**
  * DOC: bridge callbacks
  *
- * The drm_bridge_funcs ops are populated by the bridge driver. The drm
+ * The &drm_bridge_funcs ops are populated by the bridge driver. The DRM
- * internals(atomic and crtc helpers) use the helpers defined in drm_bridge.c
+ * internals (atomic and CRTC helpers) use the helpers defined in drm_bridge.c
- * These helpers call a specific drm_bridge_funcs op for all the bridges
+ * These helpers call a specific &drm_bridge_funcs op for all the bridges
  * during encoder configuration.
- *
- * When creating a bridge driver, one can implement drm_bridge_funcs op with
- * the help of these rough rules:
- *
- * pre_enable: this contains things needed to be done for the bridge before
- * its clock and timings are enabled by its source. For a bridge, its source
- * is generally the encoder or bridge just before it in the encoder chain.
- *
- * enable: this contains things needed to be done for the bridge once its
- * source is enabled. In other words, enable is called once the source is
- * ready with clock and timing needed by the bridge.
- *
- * disable: this contains things needed to be done for the bridge assuming
- * that its source is still enabled, i.e. clock and timings are still on.
- *
- * post_disable: this contains things needed to be done for the bridge once
- * its source is disabled, i.e. once clocks and timings are off.
- *
- * mode_fixup: this should fixup the given mode for the bridge. It is called
- * after the encoder's mode fixup. mode_fixup can also reject a mode completely
- * if it's unsuitable for the hardware.
  *
- * mode_set: this sets up the mode for the bridge. It assumes that its source
- * (an encoder or a bridge) has set the mode too.
+ * For detailed specification of the bridge callbacks see &drm_bridge_funcs.
  */
 /**
  * drm_bridge_mode_fixup - fixup proposed mode for all bridges in the
  *			   encoder chain
  * @bridge: bridge control structure
  * @mode: desired mode to be set for the bridge
  * @adjusted_mode: updated mode that works for this bridge
+ *
- * Calls 'mode_fixup' drm_bridge_funcs op for all the bridges in the
+ * Calls ->mode_fixup() &drm_bridge_funcs op for all the bridges in the
  * encoder chain, starting from the first bridge to the last.
+ *
  * Note: the bridge passed should be the one closest to the encoder
 	return ret;
+}
 EXPORT_SYMBOL(drm_bridge_mode_fixup);
 /**
- * drm_bridge_disable - calls 'disable' drm_bridge_funcs op for all
+ * drm_bridge_disable - calls ->disable() &drm_bridge_funcs op for all
  *			bridges in the encoder chain.
  * @bridge: bridge control structure
  *
- * Calls 'disable' drm_bridge_funcs op for all the bridges in the encoder
+ * Calls ->disable() &drm_bridge_funcs op for all the bridges in the encoder
  * chain, starting from the last bridge to the first. These are called before
  * calling the encoder's prepare op.
+ *
  * Note: the bridge passed should be the one closest to the encoder
 	bridge->funcs->disable(bridge);
+}
 EXPORT_SYMBOL(drm_bridge_disable);
 /**
- * drm_bridge_post_disable - calls 'post_disable' drm_bridge_funcs op for
+ * drm_bridge_post_disable - calls ->post_disable() &drm_bridge_funcs op for
  *			     all bridges in the encoder chain.
  * @bridge: bridge control structure
  *
- * Calls 'post_disable' drm_bridge_funcs op for all the bridges in the
+ * Calls ->post_disable() &drm_bridge_funcs op for all the bridges in the
  * encoder chain, starting from the first bridge to the last. These are called
  * after completing the encoder's prepare op.
+ *
  * Note: the bridge passed should be the one closest to the encoder
  *			 encoder chain
  * @bridge: bridge control structure
  * @mode: desired mode to be set for the bridge
  * @adjusted_mode: updated mode that works for this bridge
+ *
- * Calls 'mode_set' drm_bridge_funcs op for all the bridges in the
+ * Calls ->mode_set() &drm_bridge_funcs op for all the bridges in the
  * encoder chain, starting from the first bridge to the last.
+ *
  * Note: the bridge passed should be the one closest to the encoder
  */
 void drm_bridge_mode_set(struct drm_bridge *bridge,
 	drm_bridge_mode_set(bridge->next, mode, adjusted_mode);
+}
 EXPORT_SYMBOL(drm_bridge_mode_set);
 /**
- * drm_bridge_pre_enable - calls 'pre_enable' drm_bridge_funcs op for all
+ * drm_bridge_pre_enable - calls ->pre_enable() &drm_bridge_funcs op for all
  *			   bridges in the encoder chain.
  * @bridge: bridge control structure
  *
- * Calls 'pre_enable' drm_bridge_funcs op for all the bridges in the encoder
+ * Calls ->pre_enable() &drm_bridge_funcs op for all the bridges in the encoder
  * chain, starting from the last bridge to the first. These are called
  * before calling the encoder's commit op.
+ *
  * Note: the bridge passed should be the one closest to the encoder
 	bridge->funcs->pre_enable(bridge);
+}
 EXPORT_SYMBOL(drm_bridge_pre_enable);
 /**
- * drm_bridge_enable - calls 'enable' drm_bridge_funcs op for all bridges
+ * drm_bridge_enable - calls ->enable() &drm_bridge_funcs op for all bridges
  *		       in the encoder chain.
  * @bridge: bridge control structure
  *
- * Calls 'enable' drm_bridge_funcs op for all the bridges in the encoder
+ * Calls ->enable() &drm_bridge_funcs op for all the bridges in the encoder
  * chain, starting from the first bridge to the last. These are called
  * after completing the encoder's commit op.
+ *
  * Note that the bridge passed should be the one closest to the encoder

Subversion Repositories Kolibri OS

(root)/drivers/video/drm/drm_bridge.c @ 7144 – Rev 6084 → 6937