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        .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
  36static 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
  89static 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
 105static 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
 110int 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}
 130