drivers/gpu/drm/i915/intel_atomic_plane.c

   1 /*
   2  * Copyright © 2014 Intel Corporation
   3  *
   4  * Permission is hereby granted, free of charge, to any person obtaining a
   5  * copy of this software and associated documentation files (the "Software"),
   6  * to deal in the Software without restriction, including without limitation
   7  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
   8  * and/or sell copies of the Software, and to permit persons to whom the
   9  * Software is furnished to do so, subject to the following conditions:
  10  *
  11  * The above copyright notice and this permission notice (including the next
  12  * paragraph) shall be included in all copies or substantial portions of the
  13  * Software.
  14  *
  15  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  16  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  17  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  18  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  19  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
  20  * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
  21  * DEALINGS IN THE SOFTWARE.
  22  */
  23
  24 /**
  25  * DOC: atomic plane helpers
  26  *
  27  * The functions here are used by the atomic plane helper functions to
  28  * implement legacy plane updates (i.e., drm_plane->update_plane() and
  29  * drm_plane->disable_plane()).  This allows plane updates to use the
  30  * atomic state infrastructure and perform plane updates as separate
  31  * prepare/check/commit/cleanup steps.
  32  */
  33
  34 #include <drm/drmP.h>
  35 #include <drm/drm_atomic_helper.h>
  36 #include <drm/drm_plane_helper.h>
  37 #include "intel_drv.h"
  38
  39 /**
  40  * intel_create_plane_state - create plane state object
  41  * @plane: drm plane
  42  *
  43  * Allocates a fresh plane state for the given plane and sets some of
  44  * the state values to sensible initial values.
  45  *
  46  * Returns: A newly allocated plane state, or NULL on failure
  47  */
  48 struct intel_plane_state *
  49 intel_create_plane_state(struct drm_plane *plane)
  50 {
  51         struct intel_plane_state *state;
  52
  53         state = kzalloc(sizeof(*state), GFP_KERNEL);
  54         if (!state)
  55                 return NULL;
  56
  57         state->base.plane = plane;
  58         state->base.rotation = BIT(DRM_ROTATE_0);
  59
  60         return state;
  61 }
  62
  63 /**
  64  * intel_plane_duplicate_state - duplicate plane state
  65  * @plane: drm plane
  66  *
  67  * Allocates and returns a copy of the plane state (both common and
  68  * Intel-specific) for the specified plane.
  69  *
  70  * Returns: The newly allocated plane state, or NULL on failure.
  71  */
  72 struct drm_plane_state *
  73 intel_plane_duplicate_state(struct drm_plane *plane)
  74 {
  75         struct drm_plane_state *state;
  76         struct intel_plane_state *intel_state;
  77
  78         if (WARN_ON(!plane->state))
  79                 intel_state = intel_create_plane_state(plane);
  80         else
  81                 intel_state = kmemdup(plane->state, sizeof(*intel_state),
  82                                       GFP_KERNEL);
  83
  84         if (!intel_state)
  85                 return NULL;
  86
  87         state = &intel_state->base;
  88         if (state->fb)
  89                 drm_framebuffer_reference(state->fb);
  90
  91         return state;
  92 }
  93
  94 /**
  95  * intel_plane_destroy_state - destroy plane state
  96  * @plane: drm plane
  97  * @state: state object to destroy
  98  *
  99  * Destroys the plane state (both common and Intel-specific) for the
 100  * specified plane.
 101  */
 102 void
 103 intel_plane_destroy_state(struct drm_plane *plane,
 104                           struct drm_plane_state *state)
 105 {
 106         drm_atomic_helper_plane_destroy_state(plane, state);
 107 }
 108
 109 static int intel_plane_atomic_check(struct drm_plane *plane,
 110                                     struct drm_plane_state *state)
 111 {
 112         struct drm_crtc *crtc = state->crtc;
 113         struct intel_crtc *intel_crtc;
 114         struct intel_plane *intel_plane = to_intel_plane(plane);
 115         struct intel_plane_state *intel_state = to_intel_plane_state(state);
 116
 117         crtc = crtc ? crtc : plane->crtc;
 118         intel_crtc = to_intel_crtc(crtc);
 119
 120         /*
 121          * Both crtc and plane->crtc could be NULL if we're updating a
 122          * property while the plane is disabled.  We don't actually have
 123          * anything driver-specific we need to test in that case, so
 124          * just return success.
 125          */
 126         if (!crtc)
 127                 return 0;
 128
 129         /*
 130          * The original src/dest coordinates are stored in state->base, but
 131          * we want to keep another copy internal to our driver that we can
 132          * clip/modify ourselves.
 133          */
 134         intel_state->src.x1 = state->src_x;
 135         intel_state->src.y1 = state->src_y;
 136         intel_state->src.x2 = state->src_x + state->src_w;
 137         intel_state->src.y2 = state->src_y + state->src_h;
 138         intel_state->dst.x1 = state->crtc_x;
 139         intel_state->dst.y1 = state->crtc_y;
 140         intel_state->dst.x2 = state->crtc_x + state->crtc_w;
 141         intel_state->dst.y2 = state->crtc_y + state->crtc_h;
 142
 143         /* Clip all planes to CRTC size, or 0x0 if CRTC is disabled */
 144         intel_state->clip.x1 = 0;
 145         intel_state->clip.y1 = 0;
 146         intel_state->clip.x2 =
 147                 intel_crtc->active ? intel_crtc->config->pipe_src_w : 0;
 148         intel_state->clip.y2 =
 149                 intel_crtc->active ? intel_crtc->config->pipe_src_h : 0;
 150
 151         /*
 152          * Disabling a plane is always okay; we just need to update
 153          * fb tracking in a special way since cleanup_fb() won't
 154          * get called by the plane helpers.
 155          */
 156         if (state->fb == NULL && plane->state->fb != NULL) {
 157                 /*
 158                  * 'prepare' is never called when plane is being disabled, so
 159                  * we need to handle frontbuffer tracking as a special case
 160                  */
 161                 intel_crtc->atomic.disabled_planes |=
 162                         (1 << drm_plane_index(plane));
 163         }
 164
 165         return intel_plane->check_plane(plane, intel_state);
 166 }
 167
 168 static void intel_plane_atomic_update(struct drm_plane *plane,
 169                                       struct drm_plane_state *old_state)
 170 {
 171         struct intel_plane *intel_plane = to_intel_plane(plane);
 172         struct intel_plane_state *intel_state =
 173                 to_intel_plane_state(plane->state);
 174
 175         /* Don't disable an already disabled plane */
 176         if (!plane->state->fb && !old_state->fb)
 177                 return;
 178
 179         intel_plane->commit_plane(plane, intel_state);
 180 }
 181
 182 const struct drm_plane_helper_funcs intel_plane_helper_funcs = {
 183         .prepare_fb = intel_prepare_plane_fb,
 184         .cleanup_fb = intel_cleanup_plane_fb,
 185         .atomic_check = intel_plane_atomic_check,
 186         .atomic_update = intel_plane_atomic_update,
 187 };
 188
 189 /**
 190  * intel_plane_atomic_get_property - fetch plane property value
 191  * @plane: plane to fetch property for
 192  * @state: state containing the property value
 193  * @property: property to look up
 194  * @val: pointer to write property value into
 195  *
 196  * The DRM core does not store shadow copies of properties for
 197  * atomic-capable drivers.  This entrypoint is used to fetch
 198  * the current value of a driver-specific plane property.
 199  */
 200 int
 201 intel_plane_atomic_get_property(struct drm_plane *plane,
 202                                 const struct drm_plane_state *state,
 203                                 struct drm_property *property,
 204                                 uint64_t *val)
 205 {
 206         DRM_DEBUG_KMS("Unknown plane property '%s'\n", property->name);
 207         return -EINVAL;
 208 }
 209
 210 /**
 211  * intel_plane_atomic_set_property - set plane property value
 212  * @plane: plane to set property for
 213  * @state: state to update property value in
 214  * @property: property to set
 215  * @val: value to set property to
 216  *
 217  * Writes the specified property value for a plane into the provided atomic
 218  * state object.
 219  *
 220  * Returns 0 on success, -EINVAL on unrecognized properties
 221  */
 222 int
 223 intel_plane_atomic_set_property(struct drm_plane *plane,
 224                                 struct drm_plane_state *state,
 225                                 struct drm_property *property,
 226                                 uint64_t val)
 227 {
 228         DRM_DEBUG_KMS("Unknown plane property '%s'\n", property->name);
 229         return -EINVAL;
 230 }