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 const u32 tilcdc_formats[] = { DRM_FORMAT_RGB565,
  28                                       DRM_FORMAT_RGB888,
  29                                       DRM_FORMAT_XRGB8888 };
  30
  31 static struct drm_plane_funcs tilcdc_plane_funcs = {
  32         .update_plane   = drm_atomic_helper_update_plane,
  33         .disable_plane  = drm_atomic_helper_disable_plane,
  34         .destroy        = drm_plane_cleanup,
  35         .set_property   = drm_atomic_helper_plane_set_property,
  36         .reset          = drm_atomic_helper_plane_reset,
  37         .atomic_duplicate_state = drm_atomic_helper_plane_duplicate_state,
  38         .atomic_destroy_state = drm_atomic_helper_plane_destroy_state,
  39 };
  40
  41 static int tilcdc_plane_atomic_check(struct drm_plane *plane,
  42                                      struct drm_plane_state *state)
  43 {
  44         struct drm_crtc_state *crtc_state;
  45         struct drm_plane_state *old_state = plane->state;
  46         unsigned int depth, bpp;
  47
  48         if (!state->crtc)
  49                 return 0;
  50
  51         if (WARN_ON(!state->fb))
  52                 return -EINVAL;
  53
  54         if (state->crtc_x || state->crtc_y) {
  55                 dev_err(plane->dev->dev, "%s: crtc position must be zero.",
  56                         __func__);
  57                 return -EINVAL;
  58         }
  59
  60         crtc_state = drm_atomic_get_existing_crtc_state(state->state,
  61                                                         state->crtc);
  62         /* we should have a crtc state if the plane is attached to a crtc */
  63         if (WARN_ON(!crtc_state))
  64                 return 0;
  65
  66         if (crtc_state->mode.hdisplay != state->crtc_w ||
  67             crtc_state->mode.vdisplay != state->crtc_h) {
  68                 dev_err(plane->dev->dev,
  69                         "%s: Size must match mode (%dx%d == %dx%d)", __func__,
  70                         crtc_state->mode.hdisplay, crtc_state->mode.vdisplay,
  71                         state->crtc_w, state->crtc_h);
  72                 return -EINVAL;
  73         }
  74
  75         drm_fb_get_bpp_depth(state->fb->pixel_format, &depth, &bpp);
  76         if (state->fb->pitches[0] != crtc_state->mode.hdisplay * bpp / 8) {
  77                 dev_err(plane->dev->dev,
  78                         "Invalid pitch: fb and crtc widths must be the same");
  79                 return -EINVAL;
  80         }
  81
  82         if (state->fb && old_state->fb &&
  83             state->fb->pixel_format != old_state->fb->pixel_format) {
  84                 dev_dbg(plane->dev->dev,
  85                         "%s(): pixel format change requires mode_change\n",
  86                         __func__);
  87                 crtc_state->mode_changed = true;
  88         }
  89
  90         return 0;
  91 }
  92
  93 static void tilcdc_plane_atomic_update(struct drm_plane *plane,
  94                                        struct drm_plane_state *old_state)
  95 {
  96         struct drm_plane_state *state = plane->state;
  97
  98         if (!state->crtc)
  99                 return;
 100
 101         if (WARN_ON(!state->fb || !state->crtc->state))
 102                 return;
 103
 104         tilcdc_crtc_update_fb(state->crtc,
 105                               state->fb,
 106                               state->crtc->state->event);
 107 }
 108
 109 static const struct drm_plane_helper_funcs plane_helper_funcs = {
 110         .atomic_check = tilcdc_plane_atomic_check,
 111         .atomic_update = tilcdc_plane_atomic_update,
 112 };
 113
 114 int tilcdc_plane_init(struct drm_device *dev,
 115                       struct drm_plane *plane)
 116 {
 117         int ret;
 118
 119         ret = drm_plane_init(dev, plane, 1,
 120                              &tilcdc_plane_funcs,
 121                              tilcdc_formats,
 122                              ARRAY_SIZE(tilcdc_formats),
 123                              true);
 124         if (ret) {
 125                 dev_err(dev->dev, "Failed to initialize plane: %d\n", ret);
 126                 return ret;
 127         }
 128
 129         drm_plane_helper_add(plane, &plane_helper_funcs);
 130
 131         return 0;
 132 }