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_plane_duplicate_state - duplicate plane state
  41  * @plane: drm plane
  42  *
  43  * Allocates and returns a copy of the plane state (both common and
  44  * Intel-specific) for the specified plane.
  45  *
  46  * Returns: The newly allocated plane state, or NULL or failure.
  47  */
  48 struct drm_plane_state *
  49 intel_plane_duplicate_state(struct drm_plane *plane)
  50 {
  51         struct intel_plane_state *state;
  52
  53         if (plane->state)
  54                 state = kmemdup(plane->state, sizeof(*state), GFP_KERNEL);
  55         else
  56                 state = kzalloc(sizeof(*state), GFP_KERNEL);
  57
  58         if (!state)
  59                 return NULL;
  60
  61         if (state->base.fb)
  62                 drm_framebuffer_reference(state->base.fb);
  63
  64         return &state->base;
  65 }
  66
  67 /**
  68  * intel_plane_destroy_state - destroy plane state
  69  * @plane: drm plane
  70  * @state: state object to destroy
  71  *
  72  * Destroys the plane state (both common and Intel-specific) for the
  73  * specified plane.
  74  */
  75 void
  76 intel_plane_destroy_state(struct drm_plane *plane,
  77                           struct drm_plane_state *state)
  78 {
  79         drm_atomic_helper_plane_destroy_state(plane, state);
  80 }
  81
  82 static int intel_plane_atomic_check(struct drm_plane *plane,
  83                                     struct drm_plane_state *state)
  84 {
  85         struct drm_crtc *crtc = state->crtc;
  86         struct intel_crtc *intel_crtc;
  87         struct intel_plane *intel_plane = to_intel_plane(plane);
  88         struct intel_plane_state *intel_state = to_intel_plane_state(state);
  89
  90         crtc = crtc ? crtc : plane->crtc;
  91         intel_crtc = to_intel_crtc(crtc);
  92
  93         /*
  94          * The original src/dest coordinates are stored in state->base, but
  95          * we want to keep another copy internal to our driver that we can
  96          * clip/modify ourselves.
  97          */
  98         intel_state->src.x1 = state->src_x;
  99         intel_state->src.y1 = state->src_y;
 100         intel_state->src.x2 = state->src_x + state->src_w;
 101         intel_state->src.y2 = state->src_y + state->src_h;
 102         intel_state->dst.x1 = state->crtc_x;
 103         intel_state->dst.y1 = state->crtc_y;
 104         intel_state->dst.x2 = state->crtc_x + state->crtc_w;
 105         intel_state->dst.y2 = state->crtc_y + state->crtc_h;
 106
 107         /* Clip all planes to CRTC size, or 0x0 if CRTC is disabled */
 108         intel_state->clip.x1 = 0;
 109         intel_state->clip.y1 = 0;
 110         intel_state->clip.x2 =
 111                 intel_crtc->active ? intel_crtc->config.pipe_src_w : 0;
 112         intel_state->clip.y2 =
 113                 intel_crtc->active ? intel_crtc->config.pipe_src_h : 0;
 114
 115         /*
 116          * Disabling a plane is always okay; we just need to update
 117          * fb tracking in a special way since cleanup_fb() won't
 118          * get called by the plane helpers.
 119          */
 120         if (state->fb == NULL && plane->state->fb != NULL) {
 121                 /*
 122                  * 'prepare' is never called when plane is being disabled, so
 123                  * we need to handle frontbuffer tracking as a special case
 124                  */
 125                 intel_crtc->atomic.disabled_planes |=
 126                         (1 << drm_plane_index(plane));
 127         }
 128
 129         return intel_plane->check_plane(plane, intel_state);
 130 }
 131
 132 static void intel_plane_atomic_update(struct drm_plane *plane,
 133                                       struct drm_plane_state *old_state)
 134 {
 135         struct intel_plane *intel_plane = to_intel_plane(plane);
 136         struct intel_plane_state *intel_state =
 137                 to_intel_plane_state(plane->state);
 138
 139         /* Don't disable an already disabled plane */
 140         if (!plane->state->fb && !old_state->fb)
 141                 return;
 142
 143         intel_plane->commit_plane(plane, intel_state);
 144 }
 145
 146 const struct drm_plane_helper_funcs intel_plane_helper_funcs = {
 147         .prepare_fb = intel_prepare_plane_fb,
 148         .cleanup_fb = intel_cleanup_plane_fb,
 149         .atomic_check = intel_plane_atomic_check,
 150         .atomic_update = intel_plane_atomic_update,
 151 };
 152