include/drm/drm_simple_kms_helper.h

   1 /*
   2  * Copyright (C) 2016 Noralf Trønnes
   3  *
   4  * This program is free software; you can redistribute it and/or modify
   5  * it under the terms of the GNU General Public License as published by
   6  * the Free Software Foundation; either version 2 of the License, or
   7  * (at your option) any later version.
   8  */
   9
  10 #ifndef __LINUX_DRM_SIMPLE_KMS_HELPER_H
  11 #define __LINUX_DRM_SIMPLE_KMS_HELPER_H
  12
  13 #include <drm/drm_crtc.h>
  14 #include <drm/drm_encoder.h>
  15 #include <drm/drm_plane.h>
  16
  17 struct drm_simple_display_pipe;
  18
  19 /**
  20  * struct drm_simple_display_pipe_funcs - helper operations for a simple
  21  *                                        display pipeline
  22  */
  23 struct drm_simple_display_pipe_funcs {
  24         /**
  25          * @enable:
  26          *
  27          * This function should be used to enable the pipeline.
  28          * It is called when the underlying crtc is enabled.
  29          * This hook is optional.
  30          */
  31         void (*enable)(struct drm_simple_display_pipe *pipe,
  32                        struct drm_crtc_state *crtc_state);
  33         /**
  34          * @disable:
  35          *
  36          * This function should be used to disable the pipeline.
  37          * It is called when the underlying crtc is disabled.
  38          * This hook is optional.
  39          */
  40         void (*disable)(struct drm_simple_display_pipe *pipe);
  41
  42         /**
  43          * @check:
  44          *
  45          * This function is called in the check phase of an atomic update,
  46          * specifically when the underlying plane is checked.
  47          * The simple display pipeline helpers already check that the plane is
  48          * not scaled, fills the entire visible area and is always enabled
  49          * when the crtc is also enabled.
  50          * This hook is optional.
  51          *
  52          * RETURNS:
  53          *
  54          * 0 on success, -EINVAL if the state or the transition can't be
  55          * supported, -ENOMEM on memory allocation failure and -EDEADLK if an
  56          * attempt to obtain another state object ran into a &drm_modeset_lock
  57          * deadlock.
  58          */
  59         int (*check)(struct drm_simple_display_pipe *pipe,
  60                      struct drm_plane_state *plane_state,
  61                      struct drm_crtc_state *crtc_state);
  62         /**
  63          * @update:
  64          *
  65          * This function is called when the underlying plane state is updated.
  66          * This hook is optional.
  67          *
  68          * This is the function drivers should submit the
  69          * &drm_pending_vblank_event from. Using either
  70          * drm_crtc_arm_vblank_event(), when the driver supports vblank
  71          * interrupt handling, or drm_crtc_send_vblank_event() directly in case
  72          * the hardware lacks vblank support entirely.
  73          */
  74         void (*update)(struct drm_simple_display_pipe *pipe,
  75                        struct drm_plane_state *old_plane_state);
  76
  77         /**
  78          * @prepare_fb:
  79          *
  80          * Optional, called by &drm_plane_helper_funcs.prepare_fb.  Please read
  81          * the documentation for the &drm_plane_helper_funcs.prepare_fb hook for
  82          * more details.
  83          */
  84         int (*prepare_fb)(struct drm_simple_display_pipe *pipe,
  85                           struct drm_plane_state *plane_state);
  86
  87         /**
  88          * @cleanup_fb:
  89          *
  90          * Optional, called by &drm_plane_helper_funcs.cleanup_fb.  Please read
  91          * the documentation for the &drm_plane_helper_funcs.cleanup_fb hook for
  92          * more details.
  93          */
  94         void (*cleanup_fb)(struct drm_simple_display_pipe *pipe,
  95                            struct drm_plane_state *plane_state);
  96 };
  97
  98 /**
  99  * struct drm_simple_display_pipe - simple display pipeline
 100  * @crtc: CRTC control structure
 101  * @plane: Plane control structure
 102  * @encoder: Encoder control structure
 103  * @connector: Connector control structure
 104  * @funcs: Pipeline control functions (optional)
 105  *
 106  * Simple display pipeline with plane, crtc and encoder collapsed into one
 107  * entity. It should be initialized by calling drm_simple_display_pipe_init().
 108  */
 109 struct drm_simple_display_pipe {
 110         struct drm_crtc crtc;
 111         struct drm_plane plane;
 112         struct drm_encoder encoder;
 113         struct drm_connector *connector;
 114
 115         const struct drm_simple_display_pipe_funcs *funcs;
 116 };
 117
 118 int drm_simple_display_pipe_attach_bridge(struct drm_simple_display_pipe *pipe,
 119                                           struct drm_bridge *bridge);
 120
 121 int drm_simple_display_pipe_init(struct drm_device *dev,
 122                         struct drm_simple_display_pipe *pipe,
 123                         const struct drm_simple_display_pipe_funcs *funcs,
 124                         const uint32_t *formats, unsigned int format_count,
 125                         const uint64_t *format_modifiers,
 126                         struct drm_connector *connector);
 127
 128 #endif /* __LINUX_DRM_SIMPLE_KMS_HELPER_H */