LXR linux/drivers/gpu/drm/tilcdc/tilcdc

   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
  27static 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
  37static 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                state->fb->format->cpp[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->format != old_state->fb->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
  90static 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
 106static 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
 111int 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}
 131