drivers/gpu/drm/tilcdc/tilcdc_plane.c

   1 /*
   2  * Copyright (C) 2015 Texas Instruments
   3  * Author: Jyri Sarha <[email protected]>
   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         .set_property   = drm_atomic_helper_plane_set_property,
  32         .reset          = drm_atomic_helper_plane_reset,
  33         .atomic_duplicate_state = drm_atomic_helper_plane_duplicate_state,
  34         .atomic_destroy_state = drm_atomic_helper_plane_destroy_state,
  35 };
  36
  37 static int tilcdc_plane_atomic_check(struct drm_plane *plane,
  38                                      struct drm_plane_state *state)
  39 {
  40         struct drm_crtc_state *crtc_state;
  41         struct drm_plane_state *old_state = plane->state;
  42         unsigned int pitch;
  43
  44         if (!state->crtc)
  45                 return 0;
  46
  47         if (WARN_ON(!state->fb))
  48                 return -EINVAL;
  49
  50         if (state->crtc_x || state->crtc_y) {
  51                 dev_err(plane->dev->dev, "%s: crtc position must be zero.",
  52                         __func__);
  53                 return -EINVAL;
  54         }
  55
  56         crtc_state = drm_atomic_get_existing_crtc_state(state->state,
  57                                                         state->crtc);
  58         /* we should have a crtc state if the plane is attached to a crtc */
  59         if (WARN_ON(!crtc_state))
  60                 return 0;
  61
  62         if (crtc_state->mode.hdisplay != state->crtc_w ||
  63             crtc_state->mode.vdisplay != state->crtc_h) {
  64                 dev_err(plane->dev->dev,
  65                         "%s: Size must match mode (%dx%d == %dx%d)", __func__,
  66                         crtc_state->mode.hdisplay, crtc_state->mode.vdisplay,
  67                         state->crtc_w, state->crtc_h);
  68                 return -EINVAL;
  69         }
  70
  71         pitch = crtc_state->mode.hdisplay *
  72                 drm_format_plane_cpp(state->fb->pixel_format, 0);
  73         if (state->fb->pitches[0] != pitch) {
  74                 dev_err(plane->dev->dev,
  75                         "Invalid pitch: fb and crtc widths must be the same");
  76                 return -EINVAL;
  77         }
  78
  79         if (state->fb && old_state->fb &&
  80             state->fb->pixel_format != old_state->fb->pixel_format) {
  81                 dev_dbg(plane->dev->dev,
  82                         "%s(): pixel format change requires mode_change\n",
  83                         __func__);
  84                 crtc_state->mode_changed = true;
  85         }
  86
  87         return 0;
  88 }
  89
  90 static void tilcdc_plane_atomic_update(struct drm_plane *plane,
  91                                        struct drm_plane_state *old_state)
  92 {
  93         struct drm_plane_state *state = plane->state;
  94
  95         if (!state->crtc)
  96                 return;
  97
  98         if (WARN_ON(!state->fb || !state->crtc->state))
  99                 return;
 100
 101         tilcdc_crtc_update_fb(state->crtc,
 102                               state->fb,
 103                               state->crtc->state->event);
 104 }
 105
 106 static const struct drm_plane_helper_funcs plane_helper_funcs = {
 107         .atomic_check = tilcdc_plane_atomic_check,
 108         .atomic_update = tilcdc_plane_atomic_update,
 109 };
 110
 111 int tilcdc_plane_init(struct drm_device *dev,
 112                       struct drm_plane *plane)
 113 {
 114         struct tilcdc_drm_private *priv = dev->dev_private;
 115         int ret;
 116
 117         ret = drm_plane_init(dev, plane, 1,
 118                              &tilcdc_plane_funcs,
 119                              priv->pixelformats,
 120                              priv->num_pixelformats,
 121                              true);
 122         if (ret) {
 123                 dev_err(dev->dev, "Failed to initialize plane: %d\n", ret);
 124                 return ret;
 125         }
 126
 127         drm_plane_helper_add(plane, &plane_helper_funcs);
 128
 129         return 0;
 130 }