drivers/gpu/drm/tilcdc/tilcdc_plane.c

   1 /*
   2  * Copyright (C) 2015 Texas Instruments
   3  * Author: Jyri Sarha <jsarha@ti.com>
   4  *
   5  * This program is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 as published by
   7  * the Free Software Foundation.
   8  *
   9  * This program is distributed in the hope that it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  12  * more details.
  13  *
  14  * You should have received a copy of the GNU General Public License along with
  15  * this program.  If not, see <http://www.gnu.org/licenses/>.
  16  */
  17
  18 #include <drm/drmP.h>
  19
  20 #include <drm/drm_atomic.h>
  21 #include <drm/drm_plane_helper.h>
  22 #include <drm/drm_atomic_helper.h>
  23 #include <uapi/drm/drm_fourcc.h>
  24
  25 #include "tilcdc_drv.h"
  26
  27 static struct drm_plane_funcs tilcdc_plane_funcs = {
  28         .update_plane   = drm_atomic_helper_update_plane,
  29         .disable_plane  = drm_atomic_helper_disable_plane,
  30         .destroy        = drm_plane_cleanup,
  31         .reset          = drm_atomic_helper_plane_reset,
  32         .atomic_duplicate_state = drm_atomic_helper_plane_duplicate_state,
  33         .atomic_destroy_state = drm_atomic_helper_plane_destroy_state,
  34 };
  35
  36 static int tilcdc_plane_atomic_check(struct drm_plane *plane,
  37                                      struct drm_plane_state *state)
  38 {
  39         struct drm_crtc_state *crtc_state;
  40         struct drm_plane_state *old_state = plane->state;
  41         unsigned int pitch;
  42
  43         if (!state->crtc)
  44                 return 0;
  45
  46         if (WARN_ON(!state->fb))
  47                 return -EINVAL;
  48
  49         if (state->crtc_x || state->crtc_y) {
  50                 dev_err(plane->dev->dev, "%s: crtc position must be zero.",
  51                         __func__);
  52                 return -EINVAL;
  53         }
  54
  55         crtc_state = drm_atomic_get_existing_crtc_state(state->state,
  56                                                         state->crtc);
  57         /* we should have a crtc state if the plane is attached to a crtc */
  58         if (WARN_ON(!crtc_state))
  59                 return 0;
  60
  61         if (crtc_state->mode.hdisplay != state->crtc_w ||
  62             crtc_state->mode.vdisplay != state->crtc_h) {
  63                 dev_err(plane->dev->dev,
  64                         "%s: Size must match mode (%dx%d == %dx%d)", __func__,
  65                         crtc_state->mode.hdisplay, crtc_state->mode.vdisplay,
  66                         state->crtc_w, state->crtc_h);
  67                 return -EINVAL;
  68         }
  69
  70         pitch = crtc_state->mode.hdisplay *
  71                 state->fb->format->cpp[0];
  72         if (state->fb->pitches[0] != pitch) {
  73                 dev_err(plane->dev->dev,
  74                         "Invalid pitch: fb and crtc widths must be the same");
  75                 return -EINVAL;
  76         }
  77
  78         if (state->fb && old_state->fb &&
  79             state->fb->format != old_state->fb->format) {
  80                 dev_dbg(plane->dev->dev,
  81                         "%s(): pixel format change requires mode_change\n",
  82                         __func__);
  83                 crtc_state->mode_changed = true;
  84         }
  85
  86         return 0;
  87 }
  88
  89 static void tilcdc_plane_atomic_update(struct drm_plane *plane,
  90                                        struct drm_plane_state *old_state)
  91 {
  92         struct drm_plane_state *state = plane->state;
  93
  94         if (!state->crtc)
  95                 return;
  96
  97         if (WARN_ON(!state->fb || !state->crtc->state))
  98                 return;
  99
 100         tilcdc_crtc_update_fb(state->crtc,
 101                               state->fb,
 102                               state->crtc->state->event);
 103 }
 104
 105 static const struct drm_plane_helper_funcs plane_helper_funcs = {
 106         .atomic_check = tilcdc_plane_atomic_check,
 107         .atomic_update = tilcdc_plane_atomic_update,
 108 };
 109
 110 int tilcdc_plane_init(struct drm_device *dev,
 111                       struct drm_plane *plane)
 112 {
 113         struct tilcdc_drm_private *priv = dev->dev_private;
 114         int ret;
 115
 116         ret = drm_plane_init(dev, plane, 1,
 117                              &tilcdc_plane_funcs,
 118                              priv->pixelformats,
 119                              priv->num_pixelformats,
 120                              true);
 121         if (ret) {
 122                 dev_err(dev->dev, "Failed to initialize plane: %d\n", ret);
 123                 return ret;
 124         }
 125
 126         drm_plane_helper_add(plane, &plane_helper_funcs);
 127
 128         return 0;
 129 }