linux/include/drm/drm_crtc_helper.h
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   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
  42enum mode_set_atomic {
  43        LEAVE_ATOMIC_MODE_SET,
  44        ENTER_ATOMIC_MODE_SET,
  45};
  46
  47struct drm_crtc_helper_funcs {
  48        /*
  49         * Control power levels on the CRTC.  If the mode passed in is
  50         * unsupported, the provider must use the next lowest power level.
  51         */
  52        void (*dpms)(struct drm_crtc *crtc, int mode);
  53        void (*prepare)(struct drm_crtc *crtc);
  54        void (*commit)(struct drm_crtc *crtc);
  55
  56        /* Provider can fixup or change mode timings before modeset occurs */
  57        bool (*mode_fixup)(struct drm_crtc *crtc,
  58                           struct drm_display_mode *mode,
  59                           struct drm_display_mode *adjusted_mode);
  60        /* Actually set the mode */
  61        int (*mode_set)(struct drm_crtc *crtc, struct drm_display_mode *mode,
  62                        struct drm_display_mode *adjusted_mode, int x, int y,
  63                        struct drm_framebuffer *old_fb);
  64
  65        /* Move the crtc on the current fb to the given position *optional* */
  66        int (*mode_set_base)(struct drm_crtc *crtc, int x, int y,
  67                             struct drm_framebuffer *old_fb);
  68        int (*mode_set_base_atomic)(struct drm_crtc *crtc,
  69                                    struct drm_framebuffer *fb, int x, int y,
  70                                    enum mode_set_atomic);
  71
  72        /* reload the current crtc LUT */
  73        void (*load_lut)(struct drm_crtc *crtc);
  74
  75        /* disable crtc when not in use - more explicit than dpms off */
  76        void (*disable)(struct drm_crtc *crtc);
  77};
  78
  79struct drm_encoder_helper_funcs {
  80        void (*dpms)(struct drm_encoder *encoder, int mode);
  81        void (*save)(struct drm_encoder *encoder);
  82        void (*restore)(struct drm_encoder *encoder);
  83
  84        bool (*mode_fixup)(struct drm_encoder *encoder,
  85                           struct drm_display_mode *mode,
  86                           struct drm_display_mode *adjusted_mode);
  87        void (*prepare)(struct drm_encoder *encoder);
  88        void (*commit)(struct drm_encoder *encoder);
  89        void (*mode_set)(struct drm_encoder *encoder,
  90                         struct drm_display_mode *mode,
  91                         struct drm_display_mode *adjusted_mode);
  92        struct drm_crtc *(*get_crtc)(struct drm_encoder *encoder);
  93        /* detect for DAC style encoders */
  94        enum drm_connector_status (*detect)(struct drm_encoder *encoder,
  95                                            struct drm_connector *connector);
  96        /* disable encoder when not in use - more explicit than dpms off */
  97        void (*disable)(struct drm_encoder *encoder);
  98};
  99
 100struct drm_connector_helper_funcs {
 101        int (*get_modes)(struct drm_connector *connector);
 102        int (*mode_valid)(struct drm_connector *connector,
 103                          struct drm_display_mode *mode);
 104        struct drm_encoder *(*best_encoder)(struct drm_connector *connector);
 105};
 106
 107extern int drm_helper_probe_single_connector_modes(struct drm_connector *connector, uint32_t maxX, uint32_t maxY);
 108extern void drm_helper_disable_unused_functions(struct drm_device *dev);
 109extern int drm_crtc_helper_set_config(struct drm_mode_set *set);
 110extern bool drm_crtc_helper_set_mode(struct drm_crtc *crtc,
 111                                     struct drm_display_mode *mode,
 112                                     int x, int y,
 113                                     struct drm_framebuffer *old_fb);
 114extern bool drm_helper_crtc_in_use(struct drm_crtc *crtc);
 115extern bool drm_helper_encoder_in_use(struct drm_encoder *encoder);
 116
 117extern void drm_helper_connector_dpms(struct drm_connector *connector, int mode);
 118
 119extern int drm_helper_mode_fill_fb_struct(struct drm_framebuffer *fb,
 120                                          struct drm_mode_fb_cmd *mode_cmd);
 121
 122static inline void drm_crtc_helper_add(struct drm_crtc *crtc,
 123                                       const struct drm_crtc_helper_funcs *funcs)
 124{
 125        crtc->helper_private = (void *)funcs;
 126}
 127
 128static inline void drm_encoder_helper_add(struct drm_encoder *encoder,
 129                                          const struct drm_encoder_helper_funcs *funcs)
 130{
 131        encoder->helper_private = (void *)funcs;
 132}
 133
 134static inline void drm_connector_helper_add(struct drm_connector *connector,
 135                                            const struct drm_connector_helper_funcs *funcs)
 136{
 137        connector->helper_private = (void *)funcs;
 138}
 139
 140extern int drm_helper_resume_force_mode(struct drm_device *dev);
 141extern void drm_kms_helper_poll_init(struct drm_device *dev);
 142extern void drm_kms_helper_poll_fini(struct drm_device *dev);
 143extern void drm_helper_hpd_irq_event(struct drm_device *dev);
 144
 145extern void drm_kms_helper_poll_disable(struct drm_device *dev);
 146extern void drm_kms_helper_poll_enable(struct drm_device *dev);
 147#endif
 148
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