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_plane_helper.h>
   9 #include <drm/drm_atomic_helper.h>
  10 #include <drm/drm_fourcc.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_plane_state *state)
  25 {
  26         struct drm_crtc_state *crtc_state;
  27         struct drm_plane_state *old_state = plane->state;
  28         unsigned int pitch;
  29
  30         if (!state->crtc)
  31                 return 0;
  32
  33         if (WARN_ON(!state->fb))
  34                 return -EINVAL;
  35
  36         if (state->crtc_x || state->crtc_y) {
  37                 dev_err(plane->dev->dev, "%s: crtc position must be zero.",
  38                         __func__);
  39                 return -EINVAL;
  40         }
  41
  42         crtc_state = drm_atomic_get_existing_crtc_state(state->state,
  43                                                         state->crtc);
  44         /* we should have a crtc state if the plane is attached to a crtc */
  45         if (WARN_ON(!crtc_state))
  46                 return 0;
  47
  48         if (crtc_state->mode.hdisplay != state->crtc_w ||
  49             crtc_state->mode.vdisplay != state->crtc_h) {
  50                 dev_err(plane->dev->dev,
  51                         "%s: Size must match mode (%dx%d == %dx%d)", __func__,
  52                         crtc_state->mode.hdisplay, crtc_state->mode.vdisplay,
  53                         state->crtc_w, state->crtc_h);
  54                 return -EINVAL;
  55         }
  56
  57         pitch = crtc_state->mode.hdisplay *
  58                 state->fb->format->cpp[0];
  59         if (state->fb->pitches[0] != pitch) {
  60                 dev_err(plane->dev->dev,
  61                         "Invalid pitch: fb and crtc widths must be the same");
  62                 return -EINVAL;
  63         }
  64
  65         if (old_state->fb && state->fb->format != old_state->fb->format) {
  66                 dev_dbg(plane->dev->dev,
  67                         "%s(): pixel format change requires mode_change\n",
  68                         __func__);
  69                 crtc_state->mode_changed = true;
  70         }
  71
  72         return 0;
  73 }
  74
  75 static void tilcdc_plane_atomic_update(struct drm_plane *plane,
  76                                        struct drm_plane_state *old_state)
  77 {
  78         struct drm_plane_state *state = plane->state;
  79
  80         if (!state->crtc)
  81                 return;
  82
  83         if (WARN_ON(!state->fb || !state->crtc->state))
  84                 return;
  85
  86         if (tilcdc_crtc_update_fb(state->crtc,
  87                                   state->fb,
  88                                   state->crtc->state->event) == 0) {
  89                 state->crtc->state->event = NULL;
  90         }
  91 }
  92
  93 static const struct drm_plane_helper_funcs plane_helper_funcs = {
  94         .atomic_check = tilcdc_plane_atomic_check,
  95         .atomic_update = tilcdc_plane_atomic_update,
  96 };
  97
  98 int tilcdc_plane_init(struct drm_device *dev,
  99                       struct drm_plane *plane)
 100 {
 101         struct tilcdc_drm_private *priv = dev->dev_private;
 102         int ret;
 103
 104         ret = drm_plane_init(dev, plane, 1,
 105                              &tilcdc_plane_funcs,
 106                              priv->pixelformats,
 107                              priv->num_pixelformats,
 108                              true);
 109         if (ret) {
 110                 dev_err(dev->dev, "Failed to initialize plane: %d\n", ret);
 111                 return ret;
 112         }
 113
 114         drm_plane_helper_add(plane, &plane_helper_funcs);
 115
 116         return 0;
 117 }