drivers/gpu/drm/tilcdc/tilcdc_plane.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * Copyright (C) 2015 Texas Instruments
   4  * Author: Jyri Sarha <jsarha@ti.com>
   5  */
   6
   7 #include <drm/drm_atomic.h>
   8 #include <drm/drm_atomic_helper.h>
   9 #include <drm/drm_fourcc.h>
  10 #include <drm/drm_framebuffer.h>
  11
  12 #include "tilcdc_drv.h"
  13
  14 static const struct drm_plane_funcs tilcdc_plane_funcs = {
  15         .update_plane   = drm_atomic_helper_update_plane,
  16         .disable_plane  = drm_atomic_helper_disable_plane,
  17         .destroy        = drm_plane_cleanup,
  18         .reset          = drm_atomic_helper_plane_reset,
  19         .atomic_duplicate_state = drm_atomic_helper_plane_duplicate_state,
  20         .atomic_destroy_state = drm_atomic_helper_plane_destroy_state,
  21 };
  22
  23 static int tilcdc_plane_atomic_check(struct drm_plane *plane,
  24                                      struct drm_atomic_state *state)
  25 {
  26         struct drm_plane_state *new_state = drm_atomic_get_new_plane_state(state,
  27                                                                            plane);
  28         struct drm_crtc_state *crtc_state;
  29         struct drm_plane_state *old_state = drm_atomic_get_old_plane_state(state,
  30                                                                            plane);
  31         unsigned int pitch;
  32
  33         if (!new_state->crtc)
  34                 return 0;
  35
  36         if (WARN_ON(!new_state->fb))
  37                 return -EINVAL;
  38
  39         if (new_state->crtc_x || new_state->crtc_y) {
  40                 dev_err(plane->dev->dev, "%s: crtc position must be zero.",
  41                         __func__);
  42                 return -EINVAL;
  43         }
  44
  45         crtc_state = drm_atomic_get_existing_crtc_state(state,
  46                                                         new_state->crtc);
  47         /* we should have a crtc state if the plane is attached to a crtc */
  48         if (WARN_ON(!crtc_state))
  49                 return 0;
  50
  51         if (crtc_state->mode.hdisplay != new_state->crtc_w ||
  52             crtc_state->mode.vdisplay != new_state->crtc_h) {
  53                 dev_err(plane->dev->dev,
  54                         "%s: Size must match mode (%dx%d == %dx%d)", __func__,
  55                         crtc_state->mode.hdisplay, crtc_state->mode.vdisplay,
  56                         new_state->crtc_w, new_state->crtc_h);
  57                 return -EINVAL;
  58         }
  59
  60         pitch = crtc_state->mode.hdisplay *
  61                 new_state->fb->format->cpp[0];
  62         if (new_state->fb->pitches[0] != pitch) {
  63                 dev_err(plane->dev->dev,
  64                         "Invalid pitch: fb and crtc widths must be the same");
  65                 return -EINVAL;
  66         }
  67
  68         if (old_state->fb && new_state->fb->format != old_state->fb->format) {
  69                 dev_dbg(plane->dev->dev,
  70                         "%s(): pixel format change requires mode_change\n",
  71                         __func__);
  72                 crtc_state->mode_changed = true;
  73         }
  74
  75         return 0;
  76 }
  77
  78 static void tilcdc_plane_atomic_update(struct drm_plane *plane,
  79                                        struct drm_atomic_state *state)
  80 {
  81         struct drm_plane_state *new_state = drm_atomic_get_new_plane_state(state,
  82                                                                            plane);
  83
  84         if (!new_state->crtc)
  85                 return;
  86
  87         if (WARN_ON(!new_state->fb || !new_state->crtc->state))
  88                 return;
  89
  90         if (tilcdc_crtc_update_fb(new_state->crtc,
  91                                   new_state->fb,
  92                                   new_state->crtc->state->event) == 0) {
  93                 new_state->crtc->state->event = NULL;
  94         }
  95 }
  96
  97 static const struct drm_plane_helper_funcs plane_helper_funcs = {
  98         .atomic_check = tilcdc_plane_atomic_check,
  99         .atomic_update = tilcdc_plane_atomic_update,
 100 };
 101
 102 int tilcdc_plane_init(struct drm_device *dev,
 103                       struct drm_plane *plane)
 104 {
 105         struct tilcdc_drm_private *priv = dev->dev_private;
 106         int ret;
 107
 108         ret = drm_universal_plane_init(dev, plane, 1, &tilcdc_plane_funcs,
 109                                        priv->pixelformats,
 110                                        priv->num_pixelformats,
 111                                        NULL, DRM_PLANE_TYPE_PRIMARY, NULL);
 112         if (ret) {
 113                 dev_err(dev->dev, "Failed to initialize plane: %d\n", ret);
 114                 return ret;
 115         }
 116
 117         drm_plane_helper_add(plane, &plane_helper_funcs);
 118
 119         return 0;
 120 }