include/drm/drm_crtc_helper.h

   1 /*
   2  * Copyright © 2006 Keith Packard
   3  * Copyright © 2007-2008 Dave Airlie
   4  * Copyright © 2007-2008 Intel Corporation
   5  *   Jesse Barnes <jesse.barnes@intel.com>
   6  *
   7  * Permission is hereby granted, free of charge, to any person obtaining a
   8  * copy of this software and associated documentation files (the "Software"),
   9  * to deal in the Software without restriction, including without limitation
  10  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
  11  * and/or sell copies of the Software, and to permit persons to whom the
  12  * Software is furnished to do so, subject to the following conditions:
  13  *
  14  * The above copyright notice and this permission notice shall be included in
  15  * all copies or substantial portions of the Software.
  16  *
  17  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  18  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  19  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  20  * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
  21  * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
  22  * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
  23  * OTHER DEALINGS IN THE SOFTWARE.
  24  */
  25
  26 /*
  27  * The DRM mode setting helper functions are common code for drivers to use if
  28  * they wish.  Drivers are not forced to use this code in their
  29  * implementations but it would be useful if they code they do use at least
  30  * provides a consistent interface and operation to userspace
  31  */
  32
  33 #ifndef __DRM_CRTC_HELPER_H__
  34 #define __DRM_CRTC_HELPER_H__
  35
  36 #include <linux/spinlock.h>
  37 #include <linux/types.h>
  38 #include <linux/idr.h>
  39
  40 #include <linux/fb.h>
  41
  42 #include <drm/drm_crtc.h>
  43
  44 enum mode_set_atomic {
  45         LEAVE_ATOMIC_MODE_SET,
  46         ENTER_ATOMIC_MODE_SET,
  47 };
  48
  49 /**
  50  * struct drm_crtc_helper_funcs - helper operations for CRTCs
  51  * @dpms: set power state
  52  * @prepare: prepare the CRTC, called before @mode_set
  53  * @commit: commit changes to CRTC, called after @mode_set
  54  * @mode_fixup: try to fixup proposed mode for this CRTC
  55  * @mode_set: set this mode
  56  * @mode_set_nofb: set mode only (no scanout buffer attached)
  57  * @mode_set_base: update the scanout buffer
  58  * @mode_set_base_atomic: non-blocking mode set (used for kgdb support)
  59  * @load_lut: load color palette
  60  * @disable: disable CRTC when no longer in use
  61  * @enable: enable CRTC
  62  * @atomic_check: check for validity of an atomic state
  63  * @atomic_begin: begin atomic update
  64  * @atomic_flush: flush atomic update
  65  *
  66  * The helper operations are called by the mid-layer CRTC helper.
  67  *
  68  * Note that with atomic helpers @dpms, @prepare and @commit hooks are
  69  * deprecated. Used @enable and @disable instead exclusively.
  70  *
  71  * With legacy crtc helpers there's a big semantic difference between @disable
  72  * and the other hooks: @disable also needs to release any resources acquired in
  73  * @mode_set (like shared PLLs).
  74  */
  75 struct drm_crtc_helper_funcs {
  76         /*
  77          * Control power levels on the CRTC.  If the mode passed in is
  78          * unsupported, the provider must use the next lowest power level.
  79          */
  80         void (*dpms)(struct drm_crtc *crtc, int mode);
  81         void (*prepare)(struct drm_crtc *crtc);
  82         void (*commit)(struct drm_crtc *crtc);
  83
  84         /* Provider can fixup or change mode timings before modeset occurs */
  85         bool (*mode_fixup)(struct drm_crtc *crtc,
  86                            const struct drm_display_mode *mode,
  87                            struct drm_display_mode *adjusted_mode);
  88         /* Actually set the mode */
  89         int (*mode_set)(struct drm_crtc *crtc, struct drm_display_mode *mode,
  90                         struct drm_display_mode *adjusted_mode, int x, int y,
  91                         struct drm_framebuffer *old_fb);
  92         /* Actually set the mode for atomic helpers, optional */
  93         void (*mode_set_nofb)(struct drm_crtc *crtc);
  94
  95         /* Move the crtc on the current fb to the given position *optional* */
  96         int (*mode_set_base)(struct drm_crtc *crtc, int x, int y,
  97                              struct drm_framebuffer *old_fb);
  98         int (*mode_set_base_atomic)(struct drm_crtc *crtc,
  99                                     struct drm_framebuffer *fb, int x, int y,
 100                                     enum mode_set_atomic);
 101
 102         /* reload the current crtc LUT */
 103         void (*load_lut)(struct drm_crtc *crtc);
 104
 105         void (*disable)(struct drm_crtc *crtc);
 106         void (*enable)(struct drm_crtc *crtc);
 107
 108         /* atomic helpers */
 109         int (*atomic_check)(struct drm_crtc *crtc,
 110                             struct drm_crtc_state *state);
 111         void (*atomic_begin)(struct drm_crtc *crtc);
 112         void (*atomic_flush)(struct drm_crtc *crtc);
 113 };
 114
 115 /**
 116  * struct drm_encoder_helper_funcs - helper operations for encoders
 117  * @dpms: set power state
 118  * @save: save connector state
 119  * @restore: restore connector state
 120  * @mode_fixup: try to fixup proposed mode for this connector
 121  * @prepare: part of the disable sequence, called before the CRTC modeset
 122  * @commit: called after the CRTC modeset
 123  * @mode_set: set this mode, optional for atomic helpers
 124  * @get_crtc: return CRTC that the encoder is currently attached to
 125  * @detect: connection status detection
 126  * @disable: disable encoder when not in use (overrides DPMS off)
 127  * @enable: enable encoder
 128  * @atomic_check: check for validity of an atomic update
 129  *
 130  * The helper operations are called by the mid-layer CRTC helper.
 131  *
 132  * Note that with atomic helpers @dpms, @prepare and @commit hooks are
 133  * deprecated. Used @enable and @disable instead exclusively.
 134  *
 135  * With legacy crtc helpers there's a big semantic difference between @disable
 136  * and the other hooks: @disable also needs to release any resources acquired in
 137  * @mode_set (like shared PLLs).
 138  */
 139 struct drm_encoder_helper_funcs {
 140         void (*dpms)(struct drm_encoder *encoder, int mode);
 141         void (*save)(struct drm_encoder *encoder);
 142         void (*restore)(struct drm_encoder *encoder);
 143
 144         bool (*mode_fixup)(struct drm_encoder *encoder,
 145                            const struct drm_display_mode *mode,
 146                            struct drm_display_mode *adjusted_mode);
 147         void (*prepare)(struct drm_encoder *encoder);
 148         void (*commit)(struct drm_encoder *encoder);
 149         void (*mode_set)(struct drm_encoder *encoder,
 150                          struct drm_display_mode *mode,
 151                          struct drm_display_mode *adjusted_mode);
 152         struct drm_crtc *(*get_crtc)(struct drm_encoder *encoder);
 153         /* detect for DAC style encoders */
 154         enum drm_connector_status (*detect)(struct drm_encoder *encoder,
 155                                             struct drm_connector *connector);
 156         void (*disable)(struct drm_encoder *encoder);
 157
 158         void (*enable)(struct drm_encoder *encoder);
 159
 160         /* atomic helpers */
 161         int (*atomic_check)(struct drm_encoder *encoder,
 162                             struct drm_crtc_state *crtc_state,
 163                             struct drm_connector_state *conn_state);
 164 };
 165
 166 /**
 167  * struct drm_connector_helper_funcs - helper operations for connectors
 168  * @get_modes: get mode list for this connector
 169  * @mode_valid: is this mode valid on the given connector? (optional)
 170  * @best_encoder: return the preferred encoder for this connector
 171  *
 172  * The helper operations are called by the mid-layer CRTC helper.
 173  */
 174 struct drm_connector_helper_funcs {
 175         int (*get_modes)(struct drm_connector *connector);
 176         enum drm_mode_status (*mode_valid)(struct drm_connector *connector,
 177                                            struct drm_display_mode *mode);
 178         struct drm_encoder *(*best_encoder)(struct drm_connector *connector);
 179 };
 180
 181 extern void drm_helper_disable_unused_functions(struct drm_device *dev);
 182 extern int drm_crtc_helper_set_config(struct drm_mode_set *set);
 183 extern bool drm_crtc_helper_set_mode(struct drm_crtc *crtc,
 184                                      struct drm_display_mode *mode,
 185                                      int x, int y,
 186                                      struct drm_framebuffer *old_fb);
 187 extern bool drm_helper_crtc_in_use(struct drm_crtc *crtc);
 188 extern bool drm_helper_encoder_in_use(struct drm_encoder *encoder);
 189
 190 extern void drm_helper_connector_dpms(struct drm_connector *connector, int mode);
 191
 192 extern void drm_helper_move_panel_connectors_to_head(struct drm_device *);
 193
 194 extern void drm_helper_mode_fill_fb_struct(struct drm_framebuffer *fb,
 195                                            struct drm_mode_fb_cmd2 *mode_cmd);
 196
 197 static inline void drm_crtc_helper_add(struct drm_crtc *crtc,
 198                                        const struct drm_crtc_helper_funcs *funcs)
 199 {
 200         crtc->helper_private = funcs;
 201 }
 202
 203 static inline void drm_encoder_helper_add(struct drm_encoder *encoder,
 204                                           const struct drm_encoder_helper_funcs *funcs)
 205 {
 206         encoder->helper_private = funcs;
 207 }
 208
 209 static inline void drm_connector_helper_add(struct drm_connector *connector,
 210                                             const struct drm_connector_helper_funcs *funcs)
 211 {
 212         connector->helper_private = funcs;
 213 }
 214
 215 extern void drm_helper_resume_force_mode(struct drm_device *dev);
 216
 217 int drm_helper_crtc_mode_set(struct drm_crtc *crtc, struct drm_display_mode *mode,
 218                              struct drm_display_mode *adjusted_mode, int x, int y,
 219                              struct drm_framebuffer *old_fb);
 220 int drm_helper_crtc_mode_set_base(struct drm_crtc *crtc, int x, int y,
 221                                   struct drm_framebuffer *old_fb);
 222
 223 /* drm_probe_helper.c */
 224 extern int drm_helper_probe_single_connector_modes(struct drm_connector
 225                                                    *connector, uint32_t maxX,
 226                                                    uint32_t maxY);
 227 extern int drm_helper_probe_single_connector_modes_nomerge(struct drm_connector
 228                                                            *connector,
 229                                                            uint32_t maxX,
 230                                                            uint32_t maxY);
 231 extern void drm_kms_helper_poll_init(struct drm_device *dev);
 232 extern void drm_kms_helper_poll_fini(struct drm_device *dev);
 233 extern bool drm_helper_hpd_irq_event(struct drm_device *dev);
 234 extern void drm_kms_helper_hotplug_event(struct drm_device *dev);
 235
 236 extern void drm_kms_helper_poll_disable(struct drm_device *dev);
 237 extern void drm_kms_helper_poll_enable(struct drm_device *dev);
 238
 239 #endif