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