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 23 #ifndef __DRM_ENCODER_H__ 24 #define __DRM_ENCODER_H__ 25 26 #include <linux/list.h> 27 #include <linux/ctype.h> 28 #include <drm/drm_crtc.h> 29 #include <drm/drm_mode.h> 30 #include <drm/drm_mode_object.h> 31 #include <drm/drm_util.h> 32 33 struct drm_encoder; 34 35 /** 36 * struct drm_encoder_funcs - encoder controls 37 * 38 * Encoders sit between CRTCs and connectors. 39 */ 40 struct drm_encoder_funcs { 41 /** 42 * @reset: 43 * 44 * Reset encoder hardware and software state to off. This function isn't 45 * called by the core directly, only through drm_mode_config_reset(). 46 * It's not a helper hook only for historical reasons. 47 */ 48 void (*reset)(struct drm_encoder *encoder); 49 50 /** 51 * @destroy: 52 * 53 * Clean up encoder resources. This is only called at driver unload time 54 * through drm_mode_config_cleanup() since an encoder cannot be 55 * hotplugged in DRM. 56 */ 57 void (*destroy)(struct drm_encoder *encoder); 58 59 /** 60 * @late_register: 61 * 62 * This optional hook can be used to register additional userspace 63 * interfaces attached to the encoder like debugfs interfaces. 64 * It is called late in the driver load sequence from drm_dev_register(). 65 * Everything added from this callback should be unregistered in 66 * the early_unregister callback. 67 * 68 * Returns: 69 * 70 * 0 on success, or a negative error code on failure. 71 */ 72 int (*late_register)(struct drm_encoder *encoder); 73 74 /** 75 * @early_unregister: 76 * 77 * This optional hook should be used to unregister the additional 78 * userspace interfaces attached to the encoder from 79 * @late_register. It is called from drm_dev_unregister(), 80 * early in the driver unload sequence to disable userspace access 81 * before data structures are torndown. 82 */ 83 void (*early_unregister)(struct drm_encoder *encoder); 84 }; 85 86 /** 87 * struct drm_encoder - central DRM encoder structure 88 * @dev: parent DRM device 89 * @head: list management 90 * @base: base KMS object 91 * @name: human readable name, can be overwritten by the driver 92 * @funcs: control functions 93 * @helper_private: mid-layer private data 94 * 95 * CRTCs drive pixels to encoders, which convert them into signals 96 * appropriate for a given connector or set of connectors. 97 */ 98 struct drm_encoder { 99 struct drm_device *dev; 100 struct list_head head; 101 102 struct drm_mode_object base; 103 char *name; 104 /** 105 * @encoder_type: 106 * 107 * One of the DRM_MODE_ENCODER_<foo> types in drm_mode.h. The following 108 * encoder types are defined thus far: 109 * 110 * - DRM_MODE_ENCODER_DAC for VGA and analog on DVI-I/DVI-A. 111 * 112 * - DRM_MODE_ENCODER_TMDS for DVI, HDMI and (embedded) DisplayPort. 113 * 114 * - DRM_MODE_ENCODER_LVDS for display panels, or in general any panel 115 * with a proprietary parallel connector. 116 * 117 * - DRM_MODE_ENCODER_TVDAC for TV output (Composite, S-Video, 118 * Component, SCART). 119 * 120 * - DRM_MODE_ENCODER_VIRTUAL for virtual machine displays 121 * 122 * - DRM_MODE_ENCODER_DSI for panels connected using the DSI serial bus. 123 * 124 * - DRM_MODE_ENCODER_DPI for panels connected using the DPI parallel 125 * bus. 126 * 127 * - DRM_MODE_ENCODER_DPMST for special fake encoders used to allow 128 * mutliple DP MST streams to share one physical encoder. 129 */ 130 int encoder_type; 131 132 /** 133 * @index: Position inside the mode_config.list, can be used as an array 134 * index. It is invariant over the lifetime of the encoder. 135 */ 136 unsigned index; 137 138 /** 139 * @possible_crtcs: Bitmask of potential CRTC bindings, using 140 * drm_crtc_index() as the index into the bitfield. The driver must set 141 * the bits for all &drm_crtc objects this encoder can be connected to 142 * before calling drm_dev_register(). 143 * 144 * You will get a WARN if you get this wrong in the driver. 145 * 146 * Note that since CRTC objects can't be hotplugged the assigned indices 147 * are stable and hence known before registering all objects. 148 */ 149 uint32_t possible_crtcs; 150 151 /** 152 * @possible_clones: Bitmask of potential sibling encoders for cloning, 153 * using drm_encoder_index() as the index into the bitfield. The driver 154 * must set the bits for all &drm_encoder objects which can clone a 155 * &drm_crtc together with this encoder before calling 156 * drm_dev_register(). Drivers should set the bit representing the 157 * encoder itself, too. Cloning bits should be set such that when two 158 * encoders can be used in a cloned configuration, they both should have 159 * each another bits set. 160 * 161 * As an exception to the above rule if the driver doesn't implement 162 * any cloning it can leave @possible_clones set to 0. The core will 163 * automagically fix this up by setting the bit for the encoder itself. 164 * 165 * You will get a WARN if you get this wrong in the driver. 166 * 167 * Note that since encoder objects can't be hotplugged the assigned indices 168 * are stable and hence known before registering all objects. 169 */ 170 uint32_t possible_clones; 171 172 /** 173 * @crtc: Currently bound CRTC, only really meaningful for non-atomic 174 * drivers. Atomic drivers should instead check 175 * &drm_connector_state.crtc. 176 */ 177 struct drm_crtc *crtc; 178 179 /** 180 * @bridge_chain: Bridges attached to this encoder. Drivers shall not 181 * access this field directly. 182 */ 183 struct list_head bridge_chain; 184 185 const struct drm_encoder_funcs *funcs; 186 const struct drm_encoder_helper_funcs *helper_private; 187 }; 188 189 #define obj_to_encoder(x) container_of(x, struct drm_encoder, base) 190 191 __printf(5, 6) 192 int drm_encoder_init(struct drm_device *dev, 193 struct drm_encoder *encoder, 194 const struct drm_encoder_funcs *funcs, 195 int encoder_type, const char *name, ...); 196 197 /** 198 * drm_encoder_index - find the index of a registered encoder 199 * @encoder: encoder to find index for 200 * 201 * Given a registered encoder, return the index of that encoder within a DRM 202 * device's list of encoders. 203 */ 204 static inline unsigned int drm_encoder_index(const struct drm_encoder *encoder) 205 { 206 return encoder->index; 207 } 208 209 /** 210 * drm_encoder_mask - find the mask of a registered encoder 211 * @encoder: encoder to find mask for 212 * 213 * Given a registered encoder, return the mask bit of that encoder for an 214 * encoder's possible_clones field. 215 */ 216 static inline u32 drm_encoder_mask(const struct drm_encoder *encoder) 217 { 218 return 1 << drm_encoder_index(encoder); 219 } 220 221 /** 222 * drm_encoder_crtc_ok - can a given crtc drive a given encoder? 223 * @encoder: encoder to test 224 * @crtc: crtc to test 225 * 226 * Returns false if @encoder can't be driven by @crtc, true otherwise. 227 */ 228 static inline bool drm_encoder_crtc_ok(struct drm_encoder *encoder, 229 struct drm_crtc *crtc) 230 { 231 return !!(encoder->possible_crtcs & drm_crtc_mask(crtc)); 232 } 233 234 /** 235 * drm_encoder_find - find a &drm_encoder 236 * @dev: DRM device 237 * @file_priv: drm file to check for lease against. 238 * @id: encoder id 239 * 240 * Returns the encoder with @id, NULL if it doesn't exist. Simple wrapper around 241 * drm_mode_object_find(). 242 */ 243 static inline struct drm_encoder *drm_encoder_find(struct drm_device *dev, 244 struct drm_file *file_priv, 245 uint32_t id) 246 { 247 struct drm_mode_object *mo; 248 249 mo = drm_mode_object_find(dev, file_priv, id, DRM_MODE_OBJECT_ENCODER); 250 251 return mo ? obj_to_encoder(mo) : NULL; 252 } 253 254 void drm_encoder_cleanup(struct drm_encoder *encoder); 255 256 /** 257 * drm_for_each_encoder_mask - iterate over encoders specified by bitmask 258 * @encoder: the loop cursor 259 * @dev: the DRM device 260 * @encoder_mask: bitmask of encoder indices 261 * 262 * Iterate over all encoders specified by bitmask. 263 */ 264 #define drm_for_each_encoder_mask(encoder, dev, encoder_mask) \ 265 list_for_each_entry((encoder), &(dev)->mode_config.encoder_list, head) \ 266 for_each_if ((encoder_mask) & drm_encoder_mask(encoder)) 267 268 /** 269 * drm_for_each_encoder - iterate over all encoders 270 * @encoder: the loop cursor 271 * @dev: the DRM device 272 * 273 * Iterate over all encoders of @dev. 274 */ 275 #define drm_for_each_encoder(encoder, dev) \ 276 list_for_each_entry(encoder, &(dev)->mode_config.encoder_list, head) 277 278 #endif 279