drm_encoder.h 8.8 KB

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  1. /*
  2. * Copyright (c) 2016 Intel Corporation
  3. *
  4. * Permission to use, copy, modify, distribute, and sell this software and its
  5. * documentation for any purpose is hereby granted without fee, provided that
  6. * the above copyright notice appear in all copies and that both that copyright
  7. * notice and this permission notice appear in supporting documentation, and
  8. * that the name of the copyright holders not be used in advertising or
  9. * publicity pertaining to distribution of the software without specific,
  10. * written prior permission. The copyright holders make no representations
  11. * about the suitability of this software for any purpose. It is provided "as
  12. * is" without express or implied warranty.
  13. *
  14. * THE COPYRIGHT HOLDERS DISCLAIM ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
  15. * INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO
  16. * EVENT SHALL THE COPYRIGHT HOLDERS BE LIABLE FOR ANY SPECIAL, INDIRECT OR
  17. * CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE,
  18. * DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
  19. * TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
  20. * OF THIS SOFTWARE.
  21. */
  22. #ifndef __DRM_ENCODER_H__
  23. #define __DRM_ENCODER_H__
  24. #include <linux/list.h>
  25. #include <linux/ctype.h>
  26. #include <drm/drm_crtc.h>
  27. #include <drm/drm_mode.h>
  28. #include <drm/drm_mode_object.h>
  29. #include <drm/drm_util.h>
  30. struct drm_encoder;
  31. /**
  32. * struct drm_encoder_funcs - encoder controls
  33. *
  34. * Encoders sit between CRTCs and connectors.
  35. */
  36. struct drm_encoder_funcs {
  37. /**
  38. * @reset:
  39. *
  40. * Reset encoder hardware and software state to off. This function isn't
  41. * called by the core directly, only through drm_mode_config_reset().
  42. * It's not a helper hook only for historical reasons.
  43. */
  44. void (*reset)(struct drm_encoder *encoder);
  45. /**
  46. * @destroy:
  47. *
  48. * Clean up encoder resources. This is only called at driver unload time
  49. * through drm_mode_config_cleanup() since an encoder cannot be
  50. * hotplugged in DRM.
  51. */
  52. void (*destroy)(struct drm_encoder *encoder);
  53. /**
  54. * @late_register:
  55. *
  56. * This optional hook can be used to register additional userspace
  57. * interfaces attached to the encoder like debugfs interfaces.
  58. * It is called late in the driver load sequence from drm_dev_register().
  59. * Everything added from this callback should be unregistered in
  60. * the early_unregister callback.
  61. *
  62. * Returns:
  63. *
  64. * 0 on success, or a negative error code on failure.
  65. */
  66. int (*late_register)(struct drm_encoder *encoder);
  67. /**
  68. * @early_unregister:
  69. *
  70. * This optional hook should be used to unregister the additional
  71. * userspace interfaces attached to the encoder from
  72. * @late_register. It is called from drm_dev_unregister(),
  73. * early in the driver unload sequence to disable userspace access
  74. * before data structures are torndown.
  75. */
  76. void (*early_unregister)(struct drm_encoder *encoder);
  77. };
  78. /**
  79. * struct drm_encoder - central DRM encoder structure
  80. * @dev: parent DRM device
  81. * @head: list management
  82. * @base: base KMS object
  83. * @name: human readable name, can be overwritten by the driver
  84. * @bridge: bridge associated to the encoder
  85. * @funcs: control functions
  86. * @helper_private: mid-layer private data
  87. *
  88. * CRTCs drive pixels to encoders, which convert them into signals
  89. * appropriate for a given connector or set of connectors.
  90. */
  91. struct drm_encoder {
  92. struct drm_device *dev;
  93. struct list_head head;
  94. struct drm_mode_object base;
  95. char *name;
  96. /**
  97. * @encoder_type:
  98. *
  99. * One of the DRM_MODE_ENCODER_<foo> types in drm_mode.h. The following
  100. * encoder types are defined thus far:
  101. *
  102. * - DRM_MODE_ENCODER_DAC for VGA and analog on DVI-I/DVI-A.
  103. *
  104. * - DRM_MODE_ENCODER_TMDS for DVI, HDMI and (embedded) DisplayPort.
  105. *
  106. * - DRM_MODE_ENCODER_LVDS for display panels, or in general any panel
  107. * with a proprietary parallel connector.
  108. *
  109. * - DRM_MODE_ENCODER_TVDAC for TV output (Composite, S-Video,
  110. * Component, SCART).
  111. *
  112. * - DRM_MODE_ENCODER_VIRTUAL for virtual machine displays
  113. *
  114. * - DRM_MODE_ENCODER_DSI for panels connected using the DSI serial bus.
  115. *
  116. * - DRM_MODE_ENCODER_DPI for panels connected using the DPI parallel
  117. * bus.
  118. *
  119. * - DRM_MODE_ENCODER_DPMST for special fake encoders used to allow
  120. * mutliple DP MST streams to share one physical encoder.
  121. */
  122. int encoder_type;
  123. /**
  124. * @index: Position inside the mode_config.list, can be used as an array
  125. * index. It is invariant over the lifetime of the encoder.
  126. */
  127. unsigned index;
  128. /**
  129. * @possible_crtcs: Bitmask of potential CRTC bindings, using
  130. * drm_crtc_index() as the index into the bitfield. The driver must set
  131. * the bits for all &drm_crtc objects this encoder can be connected to
  132. * before calling drm_dev_register().
  133. *
  134. * You will get a WARN if you get this wrong in the driver.
  135. *
  136. * Note that since CRTC objects can't be hotplugged the assigned indices
  137. * are stable and hence known before registering all objects.
  138. */
  139. uint32_t possible_crtcs;
  140. /**
  141. * @possible_clones: Bitmask of potential sibling encoders for cloning,
  142. * using drm_encoder_index() as the index into the bitfield. The driver
  143. * must set the bits for all &drm_encoder objects which can clone a
  144. * &drm_crtc together with this encoder before calling
  145. * drm_dev_register(). Drivers should set the bit representing the
  146. * encoder itself, too. Cloning bits should be set such that when two
  147. * encoders can be used in a cloned configuration, they both should have
  148. * each another bits set.
  149. *
  150. * As an exception to the above rule if the driver doesn't implement
  151. * any cloning it can leave @possible_clones set to 0. The core will
  152. * automagically fix this up by setting the bit for the encoder itself.
  153. *
  154. * You will get a WARN if you get this wrong in the driver.
  155. *
  156. * Note that since encoder objects can't be hotplugged the assigned indices
  157. * are stable and hence known before registering all objects.
  158. */
  159. uint32_t possible_clones;
  160. /**
  161. * @crtc: Currently bound CRTC, only really meaningful for non-atomic
  162. * drivers. Atomic drivers should instead check
  163. * &drm_connector_state.crtc.
  164. */
  165. struct drm_crtc *crtc;
  166. /**
  167. * @bridge_chain: Bridges attached to this encoder. Drivers shall not
  168. * access this field directly.
  169. */
  170. struct list_head bridge_chain;
  171. const struct drm_encoder_funcs *funcs;
  172. const struct drm_encoder_helper_funcs *helper_private;
  173. };
  174. #define obj_to_encoder(x) container_of(x, struct drm_encoder, base)
  175. __printf(5, 6)
  176. int drm_encoder_init(struct drm_device *dev,
  177. struct drm_encoder *encoder,
  178. const struct drm_encoder_funcs *funcs,
  179. int encoder_type, const char *name, ...);
  180. /**
  181. * drm_encoder_index - find the index of a registered encoder
  182. * @encoder: encoder to find index for
  183. *
  184. * Given a registered encoder, return the index of that encoder within a DRM
  185. * device's list of encoders.
  186. */
  187. static inline unsigned int drm_encoder_index(const struct drm_encoder *encoder)
  188. {
  189. return encoder->index;
  190. }
  191. /**
  192. * drm_encoder_mask - find the mask of a registered encoder
  193. * @encoder: encoder to find mask for
  194. *
  195. * Given a registered encoder, return the mask bit of that encoder for an
  196. * encoder's possible_clones field.
  197. */
  198. static inline u32 drm_encoder_mask(const struct drm_encoder *encoder)
  199. {
  200. return 1 << drm_encoder_index(encoder);
  201. }
  202. /**
  203. * drm_encoder_crtc_ok - can a given crtc drive a given encoder?
  204. * @encoder: encoder to test
  205. * @crtc: crtc to test
  206. *
  207. * Returns false if @encoder can't be driven by @crtc, true otherwise.
  208. */
  209. static inline bool drm_encoder_crtc_ok(struct drm_encoder *encoder,
  210. struct drm_crtc *crtc)
  211. {
  212. return !!(encoder->possible_crtcs & drm_crtc_mask(crtc));
  213. }
  214. /**
  215. * drm_encoder_find - find a &drm_encoder
  216. * @dev: DRM device
  217. * @file_priv: drm file to check for lease against.
  218. * @id: encoder id
  219. *
  220. * Returns the encoder with @id, NULL if it doesn't exist. Simple wrapper around
  221. * drm_mode_object_find().
  222. */
  223. static inline struct drm_encoder *drm_encoder_find(struct drm_device *dev,
  224. struct drm_file *file_priv,
  225. uint32_t id)
  226. {
  227. struct drm_mode_object *mo;
  228. mo = drm_mode_object_find(dev, file_priv, id, DRM_MODE_OBJECT_ENCODER);
  229. return mo ? obj_to_encoder(mo) : NULL;
  230. }
  231. void drm_encoder_cleanup(struct drm_encoder *encoder);
  232. /**
  233. * drm_for_each_encoder_mask - iterate over encoders specified by bitmask
  234. * @encoder: the loop cursor
  235. * @dev: the DRM device
  236. * @encoder_mask: bitmask of encoder indices
  237. *
  238. * Iterate over all encoders specified by bitmask.
  239. */
  240. #define drm_for_each_encoder_mask(encoder, dev, encoder_mask) \
  241. list_for_each_entry((encoder), &(dev)->mode_config.encoder_list, head) \
  242. for_each_if ((encoder_mask) & drm_encoder_mask(encoder))
  243. /**
  244. * drm_for_each_encoder - iterate over all encoders
  245. * @encoder: the loop cursor
  246. * @dev: the DRM device
  247. *
  248. * Iterate over all encoders of @dev.
  249. */
  250. #define drm_for_each_encoder(encoder, dev) \
  251. list_for_each_entry(encoder, &(dev)->mode_config.encoder_list, head)
  252. #endif